A method and system for calibrating a direct current voltage ratio standard

Abstract

The application discloses a kind of calibration method and system of direct current voltage proportion standard, select the minimum proportion gear of direct current voltage proportion standard, corresponding voltage is input to direct current voltage proportion standard by direct current voltage standard source;The outer arm of direct current double-arm proportion bridge is connected with the first tap of minimum proportion gear by parallel connection with direct current voltage proportion standard, and the inner arm is connected with;The resistance of direct current double-arm proportion bridge is adjusted, so that galvanometer reading is 0;The actual voltage proportion of minimum proportion gear is equal to the corresponding multiplier value of direct current double-arm proportion bridge plus 1;Select the remaining proportion gear of direct current voltage proportion standard, corresponding voltage is input to direct current voltage proportion standard, and the inner arm is connected with the second tap of direct current voltage proportion standard;The resistance of direct current double-arm proportion bridge is adjusted, so that galvanometer reading is 0;The actual voltage proportion of the remaining proportion gear of direct current voltage proportion standard is equal to the corresponding multiplier value of direct current double-arm proportion bridge times 10 plus 10.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of voltage ratio instrument calibration, and more particularly to a calibration method and system for a direct current voltage ratio standard. BACKGROUND

[0002] The role of a direct current voltage ratio standard is to transfer the direct current voltage ratio value, and the accuracy level of the ratio value is an important indicator for measuring the performance of the direct current voltage ratio standard.

[0003] The existing calibration of the direct current voltage ratio standard is usually traced to a higher accuracy level standard divider. For example, the uncertainty of a 1kV standard divider can reach 5x10-7, which is usually used to trace the value of the direct current voltage ratio standard. However, the division ratio of the 1kV standard divider is generally only 10 / 1 and 100 / 1, while the division ratio of the 1kV direct current voltage ratio standard is not limited to this. Therefore, it is generally necessary to combine other methods for multiple calibrations, and the measurement uncertainty components will continue to accumulate during the calibration process, thereby reducing the accuracy level of the 1kV direct current voltage ratio standard. In addition, the high-accuracy 1kV standard divider can only be calibrated by a differential connection method, which is complex and even causes some structures of the 1kV direct current voltage ratio standard to be unable to be calibrated.

[0004] Therefore, a technology is needed to calibrate the 1kV direct current voltage ratio standard. SUMMARY

[0005] The technical solution of the present application provides a calibration method and system for a direct current voltage ratio standard to solve the problem of how to calibrate the direct current voltage ratio standard.

[0006] To solve the above problems, the present application provides a calibration method for a direct current voltage ratio standard, which comprises:

[0007] The direct current voltage ratio standard is connected to both ends of a direct current voltage standard source, the smallest ratio gear of the direct current voltage ratio standard is selected, and the corresponding voltage is input to the direct current voltage ratio standard through the direct current voltage standard source; wherein the smallest ratio gear of the direct current voltage ratio standard is provided with a first tap drawn from the low resistance input side and a second tap drawn from the high resistance input side, and the voltage ratio of the smallest ratio gear is 10:1;

[0008] The outer arm of the direct current double-arm ratio bridge is connected in parallel with the direct current voltage ratio standard and connected to both ends of the direct current voltage standard source, and the inner arm of the direct current double-arm ratio bridge is connected to the first tap of the smallest ratio gear of the direct current voltage ratio standard;

[0009] Adjusting the resistance value of the resistors of the DC double-arm ratio bridge so that the galvanometer reading of the DC double-arm ratio bridge is 0; then the actual voltage ratio of the minimum ratio range of the DC voltage ratio standard is equal to the corresponding ratio value of the DC double-arm ratio bridge plus 1;

[0010] Selecting the remaining ratio ranges of the DC voltage ratio standard except the minimum ratio range, inputting corresponding voltages to the DC voltage ratio standard through the DC voltage standard source, and connecting the inner arm of the DC double-arm ratio bridge with the second tap of the DC voltage ratio standard;

[0011] Adjusting the resistance value of the resistors of the DC double-arm ratio bridge so that the galvanometer reading of the DC double-arm ratio bridge is 0; then the actual voltage ratio of the minimum ratio range of the DC voltage ratio standard is equal to the corresponding ratio value of the DC double-arm ratio bridge plus 1;

[0012] Preferably, the accuracy range of the DC double-arm ratio bridge in the ratio range of 10:1 is 5x10-4. -8 .

[0013] Preferably, the DC voltage ratio standard comprises multiple voltage division ratios between 10:1 and 100:1.

[0014] Preferably, the DC voltage ratio standard comprises six voltage division ratios selected from the group consisting of 10:1, 20:1, 30:1, 50:1, 60:1, and 100:1.

[0015] Preferably, the DC voltage ratio standard comprises multiple precision resistors in series to form a voltage division structure, and the accuracy of each of the multiple precision resistors reaches 0.001%.

[0016] Preferably, the nominal resistance values of the multiple precision resistors in series to form the voltage division structure are 1kΩ, 9kΩ, 10kΩ, 10kΩ, 20kΩ, 10kΩ, and 40kΩ, respectively.

[0017] Preferably, the inner arm and the outer arm of the DC double-arm ratio bridge are adjusted in linkage and the resistance values are kept synchronized.

[0018] Preferably, the adjustment so that the galvanometer reading of the DC double-arm ratio bridge is 0 is realized by adjusting the two resistors R1 and R1’ connected to the first side of the DC double-arm ratio bridge in linkage.

[0019] Preferably, the adjustment so that the galvanometer reading of the DC double-arm ratio bridge is 0 is realized by adjusting the two resistors R2 and R2’ connected to the second side of the DC double-arm ratio bridge in linkage.

[0020] Preferably, the direct voltage ratio standard is a 1kV direct voltage ratio standard, and the calibration accuracy of the 1kV direct voltage ratio standard is 1x10 -7 .

[0021] Based on another aspect of the present application, the present application provides a calibration system of a direct voltage ratio standard, the system comprising:

[0022] An initial unit is configured to connect the direct voltage ratio standard across the direct voltage standard source, select the minimum ratio range of the direct voltage ratio standard, and input the corresponding voltage to the direct voltage ratio standard through the direct voltage standard source; wherein the minimum ratio range of the direct voltage ratio standard is provided with a first tap drawn from the low resistance input side and a second tap drawn from the high resistance input side, and the voltage ratio of the minimum ratio range is 10:1;

[0023] A first connecting unit is configured to connect the outer arm of the direct current double-arm ratio bridge in parallel with the direct voltage ratio standard and across the direct voltage standard source, and connect the inner arm of the direct current double-arm ratio bridge with the first tap of the minimum ratio range of the direct voltage ratio standard;

[0024] A first adjusting unit is configured to adjust the resistance value of the resistance of the direct current double-arm ratio bridge, so that the galvanometer reading of the direct current double-arm ratio bridge is 0; and the actual voltage ratio of the minimum ratio range of the direct voltage ratio standard is equal to the corresponding multiplier value of the direct current double-arm ratio bridge plus 1;

[0025] A second connecting unit is configured to select the remaining ratio ranges of the direct voltage ratio standard except the minimum ratio range, input the corresponding voltage to the direct voltage ratio standard through the direct voltage standard source, and connect the inner arm of the direct current double-arm ratio bridge with the second tap of the direct voltage ratio standard;

[0026] A second adjusting unit is configured to adjust the resistance value of the resistance of the direct current double-arm ratio bridge, so that the galvanometer reading of the direct current double-arm ratio bridge is 0; and the actual voltage ratio of the remaining ratio ranges of the direct voltage ratio standard except the minimum ratio range is equal to 10 times the corresponding multiplier value of the direct current double-arm ratio bridge plus 10.

[0027] Preferably, the accuracy range of the direct current double-arm ratio bridge in the multiplier range of 10:1 is 5x10 -8 .

[0028] Preferably, the direct voltage ratio standard comprises a plurality of voltage division ratios between 100:1 and 10:1.

[0029] Preferably, the direct current voltage ratio standard comprises six-grade voltage division ratio selected from the group consisting of 10:1, 20:1, 30:1, 50:1, 60:1, 100:1.

[0030] Preferably, the direct current voltage ratio standard comprises a plurality of precision resistors in series forming a voltage division structure, and the precision of the plurality of precision resistors is 0.001%.

[0031] Preferably, the nominal resistance of the plurality of precision resistors in series forming a voltage division structure is 1kΩ, 9kΩ, 10kΩ, 10kΩ, 20kΩ, 10kΩ, 40kΩ respectively.

[0032] Preferably, the inner arm and the outer arm of the direct current double-arm ratio bridge are linked and adjusted, and the resistance values are kept synchronous.

[0033] Preferably, the making the galvanometer reading of the direct current double-arm ratio bridge to be 0 is achieved by linked and adjusting the two resistors R1, R1' connected to the first side of the direct current double-arm ratio bridge.

[0034] Preferably, the making the galvanometer reading of the direct current double-arm ratio bridge to be 0 is achieved by linked and adjusting the two resistors R2, R2' connected to the second side of the direct current double-arm ratio bridge.

[0035] Preferably, the direct voltage ratio standard is a 1kV direct current voltage ratio standard, and the calibration accuracy of the 1kV direct current voltage ratio standard is 1x10 -7 .

[0036] The technical scheme of the present application provides a calibration method and system for a direct current voltage ratio standard, the method comprising: connecting the direct current voltage ratio standard to both ends of a direct current voltage standard source, selecting the minimum ratio gear of the direct current voltage ratio standard, and inputting corresponding voltage to the direct current voltage ratio standard through the direct current voltage standard source; wherein the minimum ratio gear of the direct current voltage ratio standard is provided with a first tap drawn from the input side of low resistance and a second tap drawn from the input side of high resistance, and the voltage ratio of the minimum ratio gear is 10:1; connecting the outer arm of a direct current double-arm ratio bridge in parallel with the direct current voltage ratio standard and connecting the outer arm to both ends of the direct current voltage standard source, and connecting the inner arm of the direct current double-arm ratio bridge to the first tap of the minimum ratio gear of the direct current voltage ratio standard; adjusting the resistance value of the resistor of the direct current double-arm ratio bridge so that the galvanometer reading of the direct current double-arm ratio bridge is 0; then the actual voltage ratio of the minimum ratio gear of the direct current voltage ratio standard is equal to the corresponding multiplier value of the direct current double-arm ratio bridge plus 1; selecting the remaining ratio gears of the direct current voltage ratio standard except the minimum ratio gear, inputting corresponding voltage to the direct current voltage ratio standard through the direct current voltage standard source, and connecting the inner arm of the direct current double-arm ratio bridge to the second tap of the direct current voltage ratio standard; adjusting the resistance value of the resistor of the direct current double-arm ratio bridge so that the galvanometer reading of the direct current double-arm ratio bridge is 0; then the actual voltage ratio of the remaining ratio gears of the direct current voltage ratio standard except the minimum ratio gear is equal to 10 times the corresponding multiplier value of the direct current double-arm ratio bridge plus 10. The technical scheme of the present application first calibrates the voltage ratio of the minimum ratio gear of the 1kV direct current voltage ratio standard by means of the direct current double-arm ratio bridge with high precision in a certain multiplier range, then switches the taps of the direct current voltage ratio standard so that the direct current double-arm ratio bridge still remains in the high precision multiplier range, and realizes high precision calibration of the voltage ratio of the remaining ratio gears of the 1kV direct current voltage ratio standard. BRIEF DESCRIPTION OF DRAWINGS

[0037] The exemplary embodiments of the present application can be more fully understood with reference to the following drawings:

[0038] Figure 1 A flow chart of a calibration method for a direct current voltage ratio standard according to a preferred embodiment of the present application;

[0039] Figure 2 A circuit schematic diagram of a direct current double-arm bridge according to a preferred embodiment of the present application;

[0040] Figure 3 A connection schematic diagram of a direct current voltage ratio standard and a direct current double-arm ratio bridge circuit in step S2 of the calibration method according to a preferred embodiment of the present application;

[0041] Figure 4This is a schematic diagram showing the connection between the DC voltage proportional standard and the DC double-arm proportional bridge circuit in step S2 of the calibration method according to a preferred embodiment of the present invention; and

[0042] Figure 5 This is a structural diagram of a calibration system for a DC voltage proportional standard according to a preferred embodiment of the present invention. Detailed Implementation

[0043] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0044] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0045] Figure 1 This is a flowchart of a calibration method for a DC voltage proportional standard according to a preferred embodiment of the present invention.

[0046] This invention provides a simple and highly accurate calibration method for calibrating a 1kV DC voltage proportional standard.

[0047] This application provides a calibration method for a 1kV DC voltage ratio standard. The invention utilizes a high-precision DC dual-arm proportional bridge within a certain ratio range to first calibrate the voltage ratio of the smallest ratio range of the 1kV DC voltage ratio standard. Then, by switching the taps connected to the DC voltage ratio standard, the DC dual-arm proportional bridge is kept within a high-precision ratio range, thereby achieving high-precision calibration of the voltage ratios of the remaining ratio ranges of the 1kV DC voltage ratio standard.

[0048] like Figure 1 As shown, the present invention provides a calibration method for a DC voltage proportional standard, the method comprising:

[0049] The direct voltage proportional standard is connected between the DC voltage standard source, the minimum proportional gear of the direct voltage proportional standard is selected, and the corresponding voltage is input to the direct voltage proportional standard through the DC voltage standard source; wherein the minimum proportional gear of the direct voltage proportional standard is provided with a first tap drawn from the low resistance input side and a second tap drawn from the high resistance input side, and the voltage ratio of the minimum proportional gear is 10:1.

[0050] In step S1, the direct voltage proportional standard is connected between the DC voltage standard source, the minimum proportional gear of the direct voltage proportional standard is selected, and the corresponding voltage is input to the direct voltage proportional standard through the DC voltage standard source; wherein the minimum proportional gear of the direct voltage proportional standard is provided with a first tap drawn from the low resistance input side and a second tap drawn from the high resistance input side, and the voltage ratio of the minimum proportional gear is 10:1.

[0051] The outer arm of the DC double-arm proportional bridge is connected in parallel with the direct voltage proportional standard and between the DC voltage standard source, and the inner arm of the DC double-arm proportional bridge is connected with the first tap of the minimum proportional gear of the direct voltage proportional standard.

[0052] In step S2, the outer arm of the DC double-arm proportional bridge is connected in parallel with the direct voltage proportional standard and between the DC voltage standard source, and the inner arm of the DC double-arm proportional bridge is connected with the first tap of the minimum proportional gear of the direct voltage proportional standard.

[0053] The resistance value of the DC double-arm proportional bridge is adjusted so that the galvanometer reading of the DC double-arm proportional bridge is 0; and the actual voltage ratio of the minimum proportional gear of the direct voltage proportional standard is equal to the corresponding multiplier value of the DC double-arm proportional bridge plus 1.

[0054] In step S3, the resistance value of the DC double-arm proportional bridge is adjusted so that the galvanometer reading of the DC double-arm proportional bridge is 0; and the actual voltage ratio of the minimum proportional gear of the direct voltage proportional standard is equal to the corresponding multiplier value of the DC double-arm proportional bridge plus 1.

[0055] The remaining proportional gears of the direct voltage proportional standard except the minimum proportional gear are selected, the corresponding voltage is input to the direct voltage proportional standard through the DC voltage standard source, and the inner arm of the DC double-arm proportional bridge is connected with the second tap of the direct voltage proportional standard.

[0056] In step S4, the remaining proportional gears of the direct voltage proportional standard are selected, the corresponding voltage is input to the direct voltage proportional standard through the DC voltage standard source, and the inner arm of the DC double-arm proportional bridge is connected with the second tap of the direct voltage proportional standard.

[0057] Adjusting the resistance value of the resistance in the DC double-arm proportional bridge so that the galvanometer reading of the DC double-arm proportional bridge is 0; then the actual voltage ratio of the rest of the proportional positions of the DC voltage proportional standard is equal to 10 times the corresponding multiplier value of the DC double-arm proportional bridge plus 10.

[0058] The application adjusts the resistance value of the resistance in the DC double-arm proportional bridge so that the galvanometer reading of the DC double-arm proportional bridge is 0; then the actual voltage ratio of the rest of the proportional positions of the DC voltage proportional standard is equal to 10 times the corresponding multiplier value of the DC double-arm proportional bridge plus 10.

[0059] Preferably, the accuracy range of the DC double-arm proportional bridge in the 10:1 multiplier range is 5×10 -8 .

[0060] According to the preferred embodiment of the application, the DC double-arm proportional bridge can maintain an accuracy level of 5×10 -8 in the 10:1 multiplier range.

[0061] Preferably, the DC voltage proportional standard includes multiple voltage division ratios between 10:1 and 100:1.

[0062] The 1kV DC voltage proportional standard of the application includes multiple voltage division ratios between 10:1 and 100:1.

[0063] Preferably, the DC voltage proportional standard includes six voltage division ratios selected from the group consisting of 10:1, 20:1, 30:1, 50:1, 60:1, and 100:1.

[0064] The 1kV DC voltage proportional standard of the application includes six voltage division ratios selected from the group consisting of 10:1, 20:1, 30:1, 50:1, 60:1, and 100:1.

[0065] Preferably, the DC voltage proportional standard includes multiple precision resistors in series to form a voltage division structure, and the accuracy of each of the multiple precision resistors reaches 0.001%.

[0066] The 1kV DC voltage proportional standard of the application includes multiple precision resistors in series to form a voltage division structure, and the accuracy of each of the multiple precision resistors reaches 0.001%.

[0067] Preferably, the nominal resistance values of the multiple precision resistors in series to form the voltage division structure are 1kΩ, 9kΩ, 10kΩ, 10kΩ, 20kΩ, 10kΩ, and 40kΩ, respectively.

[0068] The nominal resistance values of the plurality of precision resistors in series forming a voltage division structure are 1kΩ, 9kΩ, 10kΩ, 10kΩ, 20kΩ, 10kΩ, 40kΩ respectively.

[0069] Preferably, the inner arm and the outer arm of the DC double-arm proportional bridge are linked to adjust and the resistance values are kept synchronous.

[0070] The inner arm and the outer arm of the DC double-arm proportional bridge are linked to adjust and the resistance values are kept synchronous.

[0071] Preferably, the galvanometer reading of the DC double-arm proportional bridge is 0, which is achieved by linked adjustment of the two resistors R1, R1' connected to the first side of the DC double-arm proportional bridge.

[0072] In the steps S3 and S5 of the calibration method, the resistance value of the resistor in the DC double-arm proportional bridge is adjusted to make the galvanometer reading of the DC double-arm proportional bridge 0, which is achieved by linked adjustment of the two resistors R1, R1' connected to one side of the DC double-arm proportional bridge.

[0073] Preferably, the galvanometer reading of the DC double-arm proportional bridge is 0, which is achieved by linked adjustment of the two resistors R2, R2' connected to the second side of the DC double-arm proportional bridge.

[0074] In the steps S3 and S5 of the calibration method, the resistance value of the resistor in the DC double-arm proportional bridge is adjusted to make the galvanometer reading of the DC double-arm proportional bridge 0, which is achieved by linked adjustment of the two resistors R2, R2' connected to the other side of the DC double-arm proportional bridge.

[0075] Preferably, the direct voltage proportional standard is a 1kV direct voltage proportional standard, and the calibration accuracy of the 1kV direct voltage proportional standard is 1×10 -7 .

[0076] The calibration accuracy of the 1kV direct voltage proportional standard reaches the level of 1×10 -7 .

[0077] The application provides a method for calibrating a 1kV direct voltage proportional standard by using a DC proportional bridge. Figure 2The circuit schematic diagram of the DC double-arm bridge has two bridge arm circuits inside, which are composed of four resistors. Two resistors R1 and R1' are located on one side of the bridge, and the other two resistors R2 and R2' are located on the other side of the bridge. The inner arm and the outer arm of the double-arm bridge are linked and adjusted synchronously, that is, R1 and R1' are linked and adjusted synchronously and the resistance values are kept synchronous, and R2 and R2' are linked and adjusted synchronously and the resistance values are kept synchronous. By adjusting the resistors in the bridge, the potential difference between the two sides of the bridge is zero, that is, the reading of the galvanometer G is 0. According to the principle of electrotechnics, the following formula can be obtained:

[0078] R x / R0=R1 / R2 (1);

[0079] In the above formula (1), R x , R0 represent the resistors in the measured circuit shown in the figure, and the ratio R1 / R2 is called the ratio of the DC double-arm bridge. Figure 2

[0080] The DC double-arm bridge has the advantages of high precision, good stability, and wide measurement range. According to formula (1), the voltage ratio of each range of the 1kV DC voltage ratio standard can be calibrated by using a high-precision DC double-arm ratio bridge with adjustable ratio. For example, a commercially available high-precision DC double-arm ratio bridge can maintain a precision of up to 5×10 -8 in a ratio range of 10:1. By using this characteristic, the 1kV DC voltage ratio standard can be calibrated, thereby improving the voltage ratio value transmission precision of the DC voltage ratio standard to the level of 1×10 -7 .

[0081] Figure 1 The flowchart of the calibration method of the 1kV DC voltage ratio standard according to the embodiment of the present application includes the following steps:

[0082] S1, connecting the 1kV DC voltage ratio standard across the DC voltage standard source, selecting the smallest ratio range of the DC voltage ratio standard and inputting the corresponding voltage to it through the DC voltage standard source, wherein the smallest ratio range of the DC voltage ratio standard is provided with a first tap led out from the low resistance input side thereof and a second tap led out from the high resistance input side thereof, and the voltage ratio of the smallest ratio range is 10:1;

[0083] S2, connecting the outer arm of the DC double-arm ratio bridge in parallel with the DC voltage ratio standard across the DC voltage standard source, and connecting the inner arm of the DC double-arm ratio bridge with the first tap of the smallest ratio range of the DC voltage ratio standard;

[0084] ​S3, adjust the resistance R1 or R2 in the DC double-arm proportional bridge, so that the galvanometer G reads 0, then the voltage ratio of the minimum proportional gear of the DC voltage proportional standard equals the corresponding multiplier value of the DC double-arm proportional bridge plus 1;

[0085] S4, select the remaining proportional gears of the DC voltage proportional standard and input corresponding voltages to them through the DC voltage standard source, and connect the inner arm of the DC double-arm proportional bridge to the second tap of the DC voltage proportional standard;

[0086] S5, adjust the resistance R1 or R2 in the DC double-arm proportional bridge, so that the galvanometer G reads 0, then the voltage ratio of the remaining proportional gears of the DC voltage proportional standard equals 10 times the corresponding multiplier value of the DC double-arm proportional bridge plus 10.

[0087] Figure 3 The connection diagram of the DC voltage proportional standard in step S2 of the calibration method according to the embodiment of the present application and the DC double-arm proportional bridge circuit. The 1kV DC voltage proportional standard includes a plurality of high-precision resistors in series to form a voltage division structure, Figure 3 R0, R x , R y1 , R y2 , etc. shown in the figure are high-precision resistors with an accuracy of 0.001%, which are connected in series to form a multi-stage voltage division structure. Figure 3 The connection diagram of the DC voltage proportional standard in the minimum proportional gear and the DC double-arm proportional bridge circuit is shown, wherein R0, R x are connected in series to form a voltage division structure in the minimum proportional gear, and the nominal voltage ratio K0=(R x +R0) / R0 is 10:1, R0 and R x respectively constitute the low resistance end and the high resistance end, and R x =9×R0. For example, R0 can be a precision resistor with a nominal value of 1kΩ, and R x can be a precision resistor with a nominal value of 9kΩ. As Figure 3 shown, when calibrating the voltage ratio of the minimum proportional gear of the 1kV DC voltage proportional standard using the DC double-arm proportional bridge, first connect the 1kV DC voltage proportional standard across the DC voltage standard source, input the corresponding voltage to the DC voltage proportional standard through the DC voltage standard source, for example, 100V DC voltage, and according to the 10:1 voltage division ratio of the DC voltage proportional standard, a 10V nominal voltage output can be obtained. The minimum proportional gear of the DC voltage proportional standard (i.e., the 10:1 voltage division ratio) is provided with a first tap t1 led out from the low resistance input side thereof and a second tap t2 led out from the high resistance input side thereof, the inner arm of the DC double-arm proportional bridge is connected to the first tap t1, and the outer arm of the DC double-arm proportional bridge is connected across the DC voltage standard source and is connected in parallel with the DC voltage proportional standard.

[0088] Combining Figure 3 The step S3 is explained, when calibrating the voltage ratio of the minimum ratio position of the 1kV DC voltage ratio standard by using the DC double-arm ratio bridge, the resistance R1 or the resistance R2 in the DC double-arm ratio bridge is adjusted to make the galvanometer G reading 0, since the inner arm and the outer arm of the double-arm bridge are linked and adjusted and the resistance values are kept synchronous, according to the principle of electrotechnics, the actual voltage ratio of the minimum ratio position of the DC voltage ratio standard is derived from the following formula:

[0089] K0=(R x +R0) / R0=(R1+R2) / R2 = R1 / R2+1 (2);

[0090] According to the formula (2), the actual voltage ratio of the minimum ratio position of the DC voltage ratio standard is equal to the corresponding ratio value of the DC double-arm ratio bridge plus 1.

[0091] Figure 4 The connection diagram of the DC voltage ratio standard and the DC double-arm ratio bridge circuit in step S4 of the calibration method according to the embodiment of the present application is shown. As shown in Figure 4 When calibrating the voltage ratio of the remaining ratio positions of the 1kV DC voltage ratio standard by using the DC double-arm ratio bridge, the outer arm of the DC double-arm ratio bridge is still connected across the DC voltage standard source and connected in parallel with the DC voltage ratio standard, but the inner arm of the DC double-arm ratio bridge is changed to be connected with the second tap of the DC voltage ratio standard, at this time, the corresponding voltage is input to the DC voltage ratio standard by the DC voltage standard source, and the 10V nominal voltage is output according to the corresponding voltage division ratio of the DC voltage ratio standard. The multi-stage voltage division structure of the DC voltage ratio standard includes multiple voltage division ratios between 100:1 and 10:1, including but not limited to 10:1, 20:1, 30:1, 50:1, 60:1, 100:1. For example, the 20:1 voltage division ratio of the DC voltage ratio standard is generated by the voltage division structure formed by R0, R x , R y1 in series, and its nominal voltage ratio K1=(R y1 +R x +R0) / R0, where R0 and R x are selected as 1kΩ and 9kΩ as described above, R y1 should be selected as a precision resistor with a nominal value of 10kΩ.

[0092] Combining Figure 4The step S5 is explained. When the voltage ratio of the remaining proportional gear (i.e. non-minimum proportional gear) of the 1kV DC voltage proportional standard is calibrated by the DC double-arm proportional bridge, the resistance R1 or the resistance R2 in the DC double-arm proportional bridge is adjusted so that the galvanometer G reads 0, and it is assumed that the high resistance end of the DC voltage proportional standard is connected to R x and several high resistances R y1 , R y2 are connected in series, the sum of the resistance values of the high resistances R y1 , R y2 is recorded as R y , and since the inner arm of the DC double-arm proportional bridge is connected to the second tap t2 of the DC voltage proportional standard at this time, according to the principle of electrotechnics, the actual voltage ratio of the corresponding proportional gear of the DC voltage proportional standard is obtained by the following formula:

[0093] K i =(R0+R x +R y ) / R0=1+R x / R0+R y / R0=1+R x / R0+(1+R x / R0)*R y / (R x +R0)

[0094] =1+R x / R0+(1+R x / R0)*R1 / R2 (3);

[0095] Since R x =9×R0, according to the formula (3), the actual voltage ratio of the corresponding proportional gear of the DC voltage proportional standard is equal to 10 times the corresponding ratio value of the DC double-arm proportional bridge plus 10.

[0096] It should be noted that, in order to keep the calibration accuracy of the voltage ratio of the DC voltage proportional standard at the level of 1×10 -7 , the ratio range of the high-precision DC double-arm proportional bridge needs to be within the range of 10:1 to ensure that the proportional bridge as the quantity transfer reference keeps 5×10 -8The nominal voltage ratio of the 1kV DC voltage ratio standard at the minimum ratio position is 10:1. According to the calibration method described in the present application, the inner arm of the DC double-arm ratio bridge is connected to the first tap t1 of the minimum ratio position of the DC voltage standard source, and the ratio value of the DC double-arm ratio bridge is about 9:1, i.e., within the range of 10:1. The nominal voltage ratio of the 1kV DC voltage ratio standard at the remaining ratio positions is between 10:1 and 100:1. According to the calibration method described in the present application, the inner arm of the DC double-arm ratio bridge is connected to the second tap t2 of the DC voltage ratio standard during calibration, and the ratio value of the DC double-arm ratio bridge remains in the range of 10:1, thereby ensuring the calibration accuracy of the DC voltage ratio standard.

[0097] The embodiments of the present application are described below:

[0098] The calibration method described in the present application is further illustrated by taking the calibration of a 1kV DC voltage ratio standard including six-grade voltage division ratios {10:1; 20:1; 30:1; 50:1; 60:1; 100:1} as an example.

[0099] In particular, in the 1kV DC voltage ratio standard with the above six-grade voltage division ratios, the nominal voltage output is set to 10V, the nominal resistance value of the low resistance end resistor R0 is 1kΩ, the nominal resistance value of the high resistance end resistor R x of the minimum ratio position is 9kΩ, and thus the voltage division ratio of the minimum ratio position is 10:1. The sum of the resistance values of the high resistance resistors in series at the remaining ratio positions is R y , which are 10kΩ, 20kΩ, 40kΩ, 50kΩ, and 90kΩ, respectively. x The resistance values of the resistors in series are 10kΩ, 10kΩ, 20kΩ, 10kΩ, and 40kΩ, respectively.

[0100] According to the embodiments of the present application, the calibration of the 1kV DC voltage ratio standard with the above six-grade voltage division ratios is performed according to the following steps:

[0101] 1) The 1kV DC voltage ratio standard is connected across the DC voltage standard source, the minimum ratio position with a voltage ratio of 10:1 of the DC voltage ratio standard is selected, and the corresponding voltage is input to the DC voltage ratio standard through the DC voltage standard source. The outer arm of the DC double-arm ratio bridge is connected in parallel with the DC voltage ratio standard across the DC voltage standard source, and the inner arm of the DC double-arm ratio bridge is connected to the first tap of the minimum ratio position of the DC voltage ratio standard.

[0102] 2) adjust the resistance value of the resistance R1 or the resistance R2 in the direct current double-arm proportional bridge, so that the galvanometer G reads 0, according to the formula (2), the ratio value R1 / R2 of the direct current double-arm proportional bridge is about 9:1, and the actual voltage ratio of the minimum proportional gear of the direct current voltage proportional standard is equal to the ratio value R1 / R2 of the direct current double-arm proportional bridge plus 1;

[0103] 3) select the rest of the proportional gears of the direct current voltage proportional standard, and input corresponding voltages to the rest of the proportional gears through the direct current voltage standard source, and meanwhile, change the inner arm of the direct current double-arm proportional bridge to be connected with the second tap of the direct current voltage proportional standard;

[0104] 4) adjust the resistance value of the resistance R1 or the resistance R2 in the direct current double-arm proportional bridge, so that the galvanometer G reads 0, according to the formula (3), the ratio value R1 / R2 of the direct current double-arm proportional bridge is one of about 1:1, 2:1, 4:1, 5:1 and 9:1, and the actual voltage ratio of the corresponding proportional gear of the direct current voltage proportional standard is equal to 10 times the corresponding ratio value R1 / R2 of the direct current double-arm proportional bridge plus 10.

[0105] The present application does not need to use a standard voltage divider to calibrate the direct current voltage proportional standard, and the high-precision direct current double-arm proportional bridge can keep the 5*10 -8 -3 level of horizontal precision within the 10:1 ratio range, so that the high-precision calibration of the 1kV direct current voltage proportional standard at each proportional gear is realized, and the calibration method provided by the present application is simple to operate and can make the calibration precision of the voltage ratio reach the 1*10 -7 -4 level.

[0106] Figure 5 The figure is a structure diagram of a calibration system of a direct current voltage proportional standard according to the preferred embodiment of the present application.

[0107] As Figure 5 shown in the figure, the present application provides a calibration system of a direct current voltage proportional standard, which comprises:

[0108] An initial unit 501 is used to connect the direct current voltage proportional standard to both ends of the direct current voltage standard source, select the minimum proportional gear of the direct current voltage proportional standard, and input corresponding voltages to the direct current voltage proportional standard through the direct current voltage standard source; wherein the minimum proportional gear of the direct current voltage proportional standard is provided with a first tap drawn from the low-resistance input side and a second tap drawn from the high-resistance input side, and the voltage ratio of the minimum proportional gear is 10:1;

[0109] A first connecting unit 502 is used to connect the outer arm of the direct current double-arm proportional bridge with the direct current voltage proportional standard in parallel, and connect both ends of the direct current double-arm proportional bridge with the first tap of the minimum proportional gear of the direct current voltage proportional standard.

[0110] The first adjusting unit 503 is configured to adjust the resistance value of the resistors of the DC double-arm proportional bridge, so that the galvanometer reading of the DC double-arm proportional bridge is 0; and the actual voltage ratio of the minimum proportional gear of the DC voltage proportional standard is equal to the corresponding multiplier value of the DC double-arm proportional bridge plus 1.

[0111] The second connecting unit 504 is configured to select the remaining proportional gears of the DC voltage proportional standard except the minimum proportional gear, input corresponding voltages to the DC voltage proportional standard through the DC voltage standard source, and connect the inner arm of the DC double-arm proportional bridge with the second tap of the DC voltage proportional standard.

[0112] The second adjusting unit 505 is configured to adjust the resistance value of the resistors of the DC double-arm proportional bridge, so that the galvanometer reading of the DC double-arm proportional bridge is 0; and the actual voltage ratio of the remaining proportional gears of the DC voltage proportional standard except the minimum proportional gear is equal to 10 times the corresponding multiplier value of the DC double-arm proportional bridge plus 10.

[0113] Preferably, the accuracy range of the DC double-arm proportional bridge in the multiplier range of 10:1 is 5×10-5. -8 .

[0114] Preferably, the DC voltage proportional standard comprises multiple voltage division ratios between 10:1 and 100:1.

[0115] Preferably, the DC voltage proportional standard comprises six-gear voltage division ratios selected from the group consisting of 10:1, 20:1, 30:1, 50:1, 60:1 and 100:1.

[0116] Preferably, the DC voltage proportional standard comprises multiple precision resistors in series to form a voltage division structure, and the accuracy of each of the multiple precision resistors reaches 0.001%.

[0117] Preferably, the nominal resistance values of the multiple precision resistors in series to form the voltage division structure are 1kΩ, 9kΩ, 10kΩ, 10kΩ, 20kΩ, 10kΩ and 40kΩ, respectively.

[0118] Preferably, the inner arm and the outer arm of the DC double-arm proportional bridge are linked and adjusted and the resistance values are kept synchronous.

[0119] Preferably, the making the galvanometer reading of the DC double-arm proportional bridge be 0 is achieved by linked adjustment of the two resistors R1 and R1’ connected to the first side of the DC double-arm proportional bridge.

[0120] Preferably, the making the galvanometer reading of the direct current double-arm proportional bridge to be 0 is achieved by linkage adjustment of the two resistors R2, R2' connected to the second side of the direct current double-arm proportional bridge.

[0121] Preferably, the direct voltage proportional standard is a 1kV direct voltage proportional standard, and the calibration accuracy of the 1kV direct voltage proportional standard is 1x10 -7 .

[0122] The calibration system of a direct voltage proportional standard of the preferred embodiment of the present application corresponds to the calibration method of a direct voltage proportional standard of the preferred another embodiment of the present application, which will not be described here again.

[0123] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0124] The present application is described with reference to flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in the flow or flows and / or blocks Figure 1 The means for performing the functions specified in the flow or flows and / or blocks.

[0125] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction means that implement the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in the flow or flows and / or blocks Figure 1 The means for performing the functions specified in the flow or flows and / or blocks.

[0126] These computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operational steps are performed on the computer or other programmable devices, to generate a computer implemented process, so that the instructions executed on the computer or other programmable devices provide the function for implementing the processes specified in the flowchart Figure 1 one or more flows and / or blocks Figure 1 Figure 1 one or more blocks or multiple blocks.

[0127] Although preferred embodiments of the application have been described, those skilled in the art will be able to make additional modifications and variations to the described embodiments without departing from the spirit and scope of the application. Accordingly, the appended claims are intended to encompass within their scope all such modifications and variations as fall within the scope of the present application.

[0128] It is apparent that many modifications and variations of this application can be effected although only a few are specified and described herein. No limitation is intended by the description set forth in this patent or by the description of the preferred embodiments and various modifications must be made that are within the scope of the present application.

[0129] The application has been described by reference to several embodiments. However, it will be apparent that those skilled in the art, given the benefit of this disclosure, can make additional modifications and variations that are within the scope of the application. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. Therefore, the disclosure is intended to cover all such modifications and variations as fall within the scope of the appended claims and their equivalents.

[0130] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / an / the [device, component, etc.] are to be interpreted openly as referring to one or more instances of the device, component, etc., unless explicitly stated otherwise. The steps of any methods disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims

1. A method for calibrating a direct current voltage ratio standard, the method comprising: connecting the direct current voltage ratio standard across a direct current voltage standard source, selecting a minimum ratio range of the direct current voltage ratio standard, and inputting a corresponding voltage to the direct current voltage ratio standard through the direct current voltage standard source; wherein the minimum ratio range of the direct current voltage ratio standard is provided with a first tap drawn from a low resistance input side and a second tap drawn from a high resistance input side, and a voltage ratio of the minimum ratio range is 10:1; connecting an outer arm of a direct current double-arm ratio bridge in parallel with the direct current voltage ratio standard and across the direct current voltage standard source, and connecting an inner arm of the direct current double-arm ratio bridge with the first tap of the minimum ratio range of the direct current voltage ratio standard; adjusting resistance values of resistors of the direct current double-arm ratio bridge, so that a galvanometer reading of the direct current double-arm ratio bridge is 0; then an actual voltage ratio of the minimum ratio range of the direct current voltage ratio standard is equal to a corresponding multiplier value of the direct current double-arm ratio bridge plus 1; selecting remaining ratio ranges of the direct current voltage ratio standard except the minimum ratio range, inputting a corresponding voltage to the direct current voltage ratio standard through the direct current voltage standard source, and connecting the inner arm of the direct current double-arm ratio bridge with the second tap of the direct current voltage ratio standard; adjusting resistance values of the resistors of the direct current double-arm ratio bridge, so that the galvanometer reading of the direct current double-arm ratio bridge is 0; then actual voltage ratios of the remaining ratio ranges of the direct current voltage ratio standard except the minimum ratio range are equal to 10 times a corresponding multiplier value of the direct current double-arm ratio bridge plus 10. 3.The method of claim 1, wherein the direct current voltage ratio standard comprises a plurality of voltage division ratios between 10:1 and 100:

1. 4.The method of claim 1, wherein the direct current voltage ratio standard comprises six ratio ranges of voltage division, and the ratio ranges of voltage division are selected from the group consisting of 10:1, 20:1, 30:1, 50:1, 60:1, and 100:

1. 5.The method of claim 1, wherein the direct current voltage ratio standard comprises a plurality of precision resistors connected in series to form a voltage division structure, and the plurality of precision resistors all have a precision of 0.001%. 6.The method of claim 5, wherein nominal resistance values of the plurality of precision resistors connected in series to form the voltage division structure are 1kΩ, 9kΩ, 10kΩ, 10kΩ, 20kΩ, 10kΩ, and 40kΩ, respectively. 7.The method of claim 1, wherein the inner arm and the outer arm of the direct current double-arm ratio bridge are adjusted in linkage and resistance values are kept in synchronization.

2. The method of claim 1, the direct current dual -arm proportional bridge having a precision range of 5 x 10 -8 over a range of 10:1 of the gain. 8.The method of claim 1, wherein the galvanometer reading of the direct current double-arm ratio bridge is 0 by adjusting the two resistors R1 and R1′ connected on a first side of the direct current double-arm ratio bridge in linkage. 9.The method of claim 1, wherein the galvanometer reading of the direct current double-arm ratio bridge is 0 by adjusting the two resistors R2 and R2′ connected on a second side of the direct current double-arm ratio bridge in linkage. ​ ​ ​ ​ ​ 10. The method of claim 1, wherein the direct voltage ratio standard is a 1 kV direct current voltage ratio standard, and wherein the 1 kV direct current voltage ratio standard has a calibration accuracy of 1 x 10 -7 .

11. A calibration system of a direct current voltage ratio standard, the system comprising: an initial unit for connecting a direct voltage ratio standard across a direct current voltage standard source, selecting a minimum ratio range of the direct voltage ratio standard, and inputting a corresponding voltage to the direct voltage ratio standard through the direct current voltage standard source; wherein the minimum ratio range of the direct voltage ratio standard is provided with a first tap drawn from a low resistance input side and a second tap drawn from a high resistance input side, and a voltage ratio of the minimum ratio range is 10:1; a first connecting unit for connecting an outer arm of a direct current double-arm ratio bridge in parallel with the direct voltage ratio standard and across the direct current voltage standard source, and connecting an inner arm of the direct current double-arm ratio bridge with the first tap of the minimum ratio range of the direct voltage ratio standard; a first adjusting unit for adjusting a resistance value of a resistor of the direct current double-arm ratio bridge, so that a galvanometer reading of the direct current double-arm ratio bridge is 0; and then an actual voltage ratio of the minimum ratio range of the direct voltage ratio standard is equal to a corresponding multiplier value of the direct current double-arm ratio bridge plus 1; a second connecting unit for selecting a remaining ratio range of the direct voltage ratio standard except the minimum ratio range, inputting a corresponding voltage to the direct voltage ratio standard through the direct current voltage standard source, and connecting the inner arm of the direct current double-arm ratio bridge with the second tap of the direct voltage ratio standard; a second adjusting unit for adjusting a resistance value of a resistor of the direct current double-arm ratio bridge, so that a galvanometer reading of the direct current double-arm ratio bridge is 0; and then an actual voltage ratio of the remaining ratio range of the direct voltage ratio standard except the minimum ratio range is equal to 10 times a corresponding multiplier value of the direct current double-arm ratio bridge plus 10.

Images