Multifunctional electrician instrument measuring box

Abstract

The utility model discloses a multifunctional electrician instrument measuring box which comprises a voltage regulator, the voltage input end of the voltage regulator is connected with a household electricity 220V socket through a power line plug, and the surface of the voltage regulator is provided with an adjusting knob used for adjusting voltage output; the multifunctional electrician instrument measuring box further comprises a box body, and the side wall of the box body is provided with a delta-shaped plug socket connected with the voltage output end of the voltage regulator. The box body is provided with a leakage protector, a discharge indicating lamp, an AC voltage measuring end, a DC voltage measuring end, a DC current measuring end, a DC resistance measuring end and an AC current measuring end. According to the utility model, adjustable measured signals with alternating voltage of 0-250V, direct voltage of 0-250V, direct current of 0-50mA, direct current resistance of 0-20k omega and load (alternating current) of 0-1.5 A are integrated into one measuring box, so that a learner can measure various electrical parameters conveniently, and the safety is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of teaching instruments for electrical meters, and particularly relates to a multifunctional measuring box for electrical meters. Background Art

[0002] Multimeters and clamp meters are electrical meters that every electrical (worker) practitioner must master proficiently. The common way to learn about meters is to prepare basic electronic components such as voltage regulators, resistors, batteries, LED lights, etc. Students connect the various electronic components into a circuit and then conduct measurements. This operation process is relatively cumbersome, there are many potential safety hazards in actual operation, it is easy to cause short circuits, time-consuming and laborious, and the efficiency is very low. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a multifunctional measuring box for electrical meters, which is used to assist learners in using multimeters and clamp meters to measure various electrical parameters and has high safety.

[0004] To solve the above technical problem, the utility model adopts the following technical solutions:

[0005] A multifunctional measuring box for electrical meters includes a voltage regulator. The voltage input end of the voltage regulator is connected to a 220V household power socket through a power cord plug, and an adjustment knob for adjusting the voltage output is provided on the surface of the voltage regulator. The difference is that the multifunctional measuring box for electrical meters further includes a box body. A three-pin plug socket connected to the voltage output end of the voltage regulator is provided on the side wall of the box body. A leakage protector, a discharge indicator light, an AC voltage measurement terminal, a DC voltage measurement terminal, a DC current measurement terminal, a DC resistance measurement terminal, and an AC current measurement terminal are provided on the box body. The input end of the leakage protector is connected to the three-pin plug socket, and the output end is respectively connected to the discharge indicator light, the AC voltage measurement terminal, the DC voltage measurement terminal, the DC current measurement terminal, the DC resistance measurement terminal, and the AC current measurement terminal. The discharge indicator light is used to indicate that the box body is powered on when powered on. The AC voltage measurement terminal is used to measure AC voltage. The DC voltage measurement terminal is used to measure DC voltage. The DC current measurement terminal is used to measure DC current. The DC resistance measurement terminal is used to measure DC resistance. The AC current measurement terminal is used to measure AC current.

[0006] Further, the AC voltage measurement terminal includes an AC voltage socket hole provided on the surface of the box body. The AC voltage socket hole has two jacks, and the two jacks are respectively connected to the L terminal and the N terminal of the output end of the leakage protector.

[0007] Further, the DC voltage measurement terminal includes a single-phase rectifier bridge and a DC voltage socket hole. Among them, the single-phase rectifier bridge is arranged inside the box body, and the L terminal and N terminal of its input end are respectively connected to the L terminal and N terminal of the output end of the leakage protector; the DC voltage socket hole is arranged on the surface of the box body, and it includes two jacks, one of which is connected to the positive pole of the output end of the single-phase rectifier bridge, and the other is connected to the negative pole of the output end of the single-phase rectifier bridge.

[0008] Further, the DC current measurement terminal includes a switching power supply, a resistor R1, a first potentiometer and a DC current socket hole; among them, the DC current socket hole has two jacks, the L terminal and N terminal of the input end of the switching power supply are respectively connected to the L terminal and N terminal of the output end of the leakage protector, the positive pole of the output end of the switching power supply is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the input end of the first potentiometer, and the output end of the first potentiometer is connected to one of the jacks of the DC current socket hole; the negative pole of the output end of the switching power supply is connected to the other jack of the DC current socket hole.

[0009] Furthermore, the DC resistance measurement terminal includes a resistor R2, a boat-shaped switch, a second potentiometer and a DC resistance socket hole; among them, the DC resistance socket hole has two jacks, one end of the resistor R2 is connected to the negative pole of the output end of the switching power supply, the other end of the resistor R2 is respectively connected to the input end of the second potentiometer and one of the jacks of the DC resistance socket hole, one end of the boat-shaped switch is connected to the positive pole of the output end of the switching power supply, and the other end is respectively connected to the output end of the second potentiometer and the other jack of the DC resistance socket hole.

[0010] Further, the AC current measurement terminal includes a measured wire and a capacitor; the measured wire is arranged on the surface of the box body, one end of the measured wire is respectively connected to one end of the discharge indicator light and the L terminal of the output end of the leakage protector, the other end of the measured wire is connected to one end of the capacitor, and the other end of the capacitor is respectively connected to the other end of the discharge indicator light and the N terminal of the output end of the leakage protector.

[0011] The beneficial effects of the present utility model:

[0012] The multi-functional electrical instrument measuring box provided by the present utility model has a box body made of ABS plastic, which is designed to be lightweight and easy to carry, suitable for on-site mobile use. It has a simple operation and a concise interface, with characteristics such as high temperature resistance and waterproofness, saving costs to the greatest extent and reducing the weight of the whole machine at the same time. At the same time, adjustable measured signals of AC voltage 0 - 250V, DC voltage 0 - 250V, DC current 0 - 50mA, DC resistance 0 - 20kΩ, and load (AC) current 0 - 1.5A are integrated into one measuring box, facilitating the measurement of various electrical parameters, simulating real electrical work scenarios, providing an operation experience similar to that in actual work, and having safety measures such as short-circuit protection, overload protection, and leakage protection to ensure the safety of operators. It can perform a variety of measurement operations to meet different teaching and training needs; it is convenient for operation demonstration and interactive teaching, improving the learning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of an embodiment of the present utility model.

[0014] Figure 2 is an external schematic diagram of the voltage regulator of an embodiment of the present utility model.

[0015] Figure 3 is Figure 1 a schematic diagram of the back side.

[0016] Figure 4 is a schematic structural diagram of the operation panel of the box body of an embodiment of the present utility model.

[0017] Figure 5 is a schematic structural diagram of the built-in board of the box body of an embodiment of the present utility model.

[0018] Figure 6 is a circuit connection diagram of an embodiment of the present utility model.

[0019] The reference numerals in the figure are: 1, power cord plug; 2, voltage regulator; 3, display screen; 4, voltage regulator control switch; 5, voltage regulator fuse; 6, adjustment knob; 7, three-hole power cord plug; 8, three-hole power cord tail; 9, operation panel; 10, built-in board; 11, leakage protector; 12, discharge indicator light; 13, first potentiometer; 14, second potentiometer; 15, rocker switch; 16, AC voltage socket hole; 17, DC voltage socket hole; 18, DC current socket hole; 19, DC resistance socket hole; 20, measured wire; 21, three-pin plug socket; 22, terminal block; 23, switching power supply; 24, resistor R1; 25, resistor R2; 26, single-phase rectifier bridge; 27, capacitor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present utility model will be described below in conjunction with the accompanying drawings. The specific embodiments described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present utility model shall fall within the protection scope of the present utility model.

[0021] As Figures 1 to 6 shown, the multifunctional electrician's instrument measuring box of this embodiment includes a voltage regulator 2 and a box body.

[0022] The voltage regulator 2 is a prior art, which is a single-phase contact type AC voltage regulator. Its voltage input end is connected to a household electricity 220V socket through a power cord plug 1. On the surface of the voltage regulator 2, there is an adjustment knob 6 for adjusting the voltage output, a display screen 3 for displaying the output voltage, a voltage regulator control switch 4, and a voltage regulator fuse 5. By rotating the adjustment knob 6, an AC voltage of 0 - 250V can be output.

[0023] On the side wall of the box body, there is a three-pin plug socket 21 connected to the voltage output end of the voltage regulator 2. The input end of the three-pin plug socket 21 is connected to the voltage output end of the voltage regulator 2 through a three-hole power cord. Among them, the three-hole power cord plug 7 is inserted into the voltage output end of the voltage regulator 2, and the three-hole power cord tail 8 is inserted into the three-pin plug socket 21.

[0024] On the box body, there are a leakage protector 11, a discharge indicator light 12, an AC voltage measurement terminal, a DC voltage measurement terminal, a DC current measurement terminal, a DC resistance measurement terminal, and an AC current measurement terminal. The input end of the leakage protector 11 is connected to the three-pin plug socket 21, and the output end is respectively connected to the discharge indicator light 12, the AC voltage measurement terminal, the DC voltage measurement terminal, the DC current measurement terminal, the DC resistance measurement terminal, and the AC current measurement terminal. The discharge indicator light 12 is used to indicate that the box body is powered on when powered on; the AC voltage measurement terminal is used to measure the AC voltage; the DC voltage measurement terminal is used to measure the DC voltage; the DC current measurement terminal is used to measure the DC current; the DC resistance measurement terminal is used to measure the DC resistance; the AC current measurement terminal is used to measure the AC current.

[0025] The box body of this embodiment is made of high-temperature resistant and waterproof ABS plastic material. The size of the box body is 280mm in width * 380mm in length * 130mm in height. On its upper surface, there is an operation panel 9, and inside there is an inner board 10. The leakage protector 11 is arranged on the operation panel 9. In the circuit, the leakage protector 11 is represented by QF.

[0026] The AC voltage measurement terminal of this embodiment can output a measured signal with adjustable AC voltage from 0 to 250V. It includes an AC voltage socket hole 16 provided on the surface of the box body. The AC voltage socket hole 16 is a 4mm banana socket hole, which has two jacks, both are provided on the operation panel 9 of the box body. The two jacks are respectively connected to the L terminal and the N terminal of the output end of the leakage protector 11. The voltage output by the AC voltage socket hole 16 is the output voltage of the voltage regulator 2, that is, an adjustable AC voltage from 0 to 250V.

[0027] The DC voltage measurement terminal of this embodiment can output a measured signal with adjustable DC voltage from 0 to 250V. It includes a single-phase rectifier bridge 26 and a DC voltage socket hole 17. Among them, the single-phase rectifier bridge 26 is provided on the built-in board 10 of the box body. The L terminal and the N terminal of its input end are respectively connected to the L terminal and the N terminal of the output end of the leakage protector 11. The function of the single-phase rectifier bridge 26 is to convert the AC voltage into a DC voltage output. The DC voltage socket hole 17 is a 4mm banana socket hole, which has two jacks, both are provided on the operation panel 9 of the box body. One of the jacks is connected to the positive pole of the output end of the single-phase rectifier bridge 26. This jack is represented by red and marked as the positive pole of the measurement end; the other jack is connected to the negative pole of the output end of the single-phase rectifier bridge 26. This jack is represented by black and marked as the negative pole of the measurement end. The voltage output by the DC voltage socket hole 17 is the output voltage of the voltage regulator 2 after the single-phase rectifier bridge 26 converts the AC voltage into a DC voltage output, that is, an adjustable DC voltage from 0 to 250V.

[0028] The DC current measurement terminal of this embodiment includes a switching power supply 23, a resistor R124, a first potentiometer 13, and a DC current socket hole 18. Among them, the DC current socket hole 18 is a 4mm banana socket hole, which has two jacks, both of which are arranged on the operation panel 9 of the box body. The switching power supply 23 and the resistor R124 are arranged on the built-in board 10. The resistor R124 is an SQP cement resistor. The first potentiometer 13 is arranged on the operation panel 9, which is a precision multi-turn wire-wound potentiometer and is represented by RP1 in the circuit. The L terminal and the N terminal of the input end of the switching power supply 23 are respectively connected to the L terminal and the N terminal of the output end of the leakage protector 11. The positive pole of the output end of the switching power supply 23 is connected to one end of the resistor R124. The other end of the resistor R124 is connected to the input end of the first potentiometer 13. The output end of the first potentiometer 13 is connected to one of the jacks of the DC current socket hole 18; the negative pole of the output end of the switching power supply 23 is connected to the other jack of the DC current socket hole 18. The switching power supply 23 is used to convert the 220V AC voltage into a DC 5V voltage. The positive pole of the output end of the switching power supply 23 outputs DC current after being connected in series with the resistor R124 and the first potentiometer 13. The first potentiometer 13 is used to adjust the DC current output. The jack of the DC current socket hole 18 connected to the first potentiometer 13 is represented by red and marked as the positive pole of the measurement end; the jack of the DC current socket hole 18 connected to the negative pole of the output end of the switching power supply 23 is represented by black and marked as the negative pole of the measurement end. The DC current socket hole 18 can output 0-50mA DC current.

[0029] The DC resistance measurement terminal of this embodiment includes a resistor R225, a boat switch 15, a second potentiometer 14, and a DC resistance socket hole 19. Among them, the DC resistance socket hole 19 is a 4mm banana socket hole, which has two jacks, both of which are arranged on the operation panel 9 of the box body. The resistor R225 is arranged on the built-in board 10. The resistor R225 is an SQP cement resistor. The second potentiometer 14 is arranged on the operation panel 9, which is a precision multi-turn wire-wound potentiometer and is represented by RP2 in the circuit. The boat switch 15 is arranged on the operation panel 9 of the box body. One end of the resistor R225 is connected to the negative pole of the output end of the switching power supply 23. The other end of the resistor R225 is respectively connected to the input end of the second potentiometer 14 and one of the jacks of the DC resistance socket hole 19. One end of the boat switch 15 is connected to the positive pole of the output end of the switching power supply 23, and the other end is respectively connected to the output end of the second potentiometer 14 and the other jack of the DC resistance socket hole 19. The boat switch 15 is used to disconnect the power supply. The second potentiometer 14 is used to adjust the DC resistance. The DC resistance socket hole 19 can output 0-20kΩ DC resistance.

[0030] The AC current measurement terminal of this embodiment includes a measured wire 20 and a capacitor 27. Among them, the measured wire 20 is arranged on the operation panel 9 of the box body. One end of the measured wire 20 is respectively connected to one end of the discharge indicator lamp 12 and the L terminal of the output end of the leakage protector 11. The other end of the measured wire 20 is connected to one end of the capacitor 27. The other end of the capacitor 27 is respectively connected to the other end of the discharge indicator lamp 12 and the N terminal of the output end of the leakage protector 11. The measured wire 20 can output an AC current of 0 - 1.5A. The discharge indicator lamp 12 is connected in parallel across the two ends of the capacitor 27 and consumes the voltage of the capacitor 27 after power-off. The discharge indicator lamp 12 is represented by HL in the circuit.

[0031] A terminal block 22 is also arranged on the built-in board 10 of the box body, which is convenient for wiring between various components. Laser engraving and marking are carried out on the surface of the operation panel 9 for the corresponding components.

[0032] When this utility model is in use, the input end of the three-pin plug socket 21 of the box body is connected to the voltage output end of the voltage regulator 2 with a 1.5m three-pin power cord, and the power cord plug 1 at the voltage input end of the voltage regulator 2 is connected to the 220V household power socket. Turn on the control switch 4 of the voltage regulator, rotate the adjustment knob 6, adjust the output voltage to 220V, close the leakage protector 11 on the box body. If the discharge indicator lamp 12 lights up, it proves that the device is powered on and can measure normally.

[0033] Taking the VC830L multimeter and the VC6018 clamp ammeter as examples below, parameter measurement is carried out on the measurement box.

[0034] AC voltage measurement: Select the 600V range of the AC voltage of the multimeter. Insert the black test lead into the COM jack of the multimeter, and insert the red test lead into the voltage jack on the right side of the multimeter. Close the leakage protector 11. Hold the two test leads with one hand (fingers should not exceed the protective ring of the test leads) to measure the AC voltage socket hole 16. The AC voltage has no positive or negative polarity. Connect the two test leads to the two jacks respectively. The reading of the multimeter is () volts. Rotate the adjustment knob 6 of the voltage regulator 2, and the reading changes accordingly. The adjustable range of the AC voltage is 0 - 250V. After the measurement is completed, disconnect the leakage protector 11.

[0035] DC voltage measurement: Select the 600V range of the DC voltage of the multimeter. Insert the black test lead into the COM jack of the multimeter, and insert the red test lead into the voltage jack on the right side of the multimeter. Close the leakage protector 11. Hold the two test leads with one hand (fingers should not exceed the protective ring of the test leads) to measure the AC voltage socket hole 16. Connect the red test lead to the jack marked as positive, and connect the black test lead to the jack marked as negative. The reading of the multimeter is () volts. Change the adjustment knob 6 of the voltage regulator 2, and the reading changes accordingly. The adjustable range of the DC voltage is 0 - 250V. After the measurement is completed, disconnect the leakage protector 11.

[0036] DC current measurement: Select the 200 mA range of the multimeter for DC current. Insert the black test lead into the COM jack of the multimeter, and insert the red test lead into the mA jack on the right side of the multimeter. Close the leakage protector 11. Hold the two test leads with one hand (fingers should not exceed the protective ring of the test leads) to measure the DC current socket hole 18. The red test lead is connected to the jack marked as positive, and the black test lead is connected to the jack marked as negative. The reading of the multimeter is () mA. Adjust the first potentiometer 13, and the reading changes accordingly. The adjustable range of DC current is 0 - 50 mA. After the measurement, disconnect the leakage protector 11.

[0037] DC resistance measurement: Select the 200 KΩ range of the multimeter for resistance. Insert the black test lead into the COM jack of the multimeter, and insert the red test lead into the Ω jack on the right side of the multimeter. Close the leakage protector 11, and disconnect the boat switch 15. Hold the two test leads with one hand (fingers should not exceed the protective ring of the test leads) to measure the DC resistance socket hole 19. DC resistance has no positive or negative poles. Connect the two test leads to the two jacks respectively. The reading of the multimeter is () Ω. Adjust the second potentiometer 14, and the reading changes accordingly. The adjustable range of DC resistance is 0 - 20 kΩ. After the measurement, close the boat switch 15 and disconnect the leakage protector 11.

[0038] Load (AC) current measurement: Select the 600 A range of the clamp ammeter for AC. Close the leakage protector 11. Open the jaws of the clamp and suspend it to clamp the measured wire 20, and ensure that the measured wire 20 is in the exact middle of the jaws. Keep the clamp meter horizontal. After stabilization (about 4 seconds), press the HOLD lock key, and the reading is () A. When measuring a relatively small current, to make the reading more accurate, the measured wire 20 can be wound around several times and then put into the jaws for measurement. The actual current value is equal to the reading of the instrument divided by the number of turns of the wire coil put into the jaws. The maximum number of turns that can be measured in this design is 5. Change the adjustment knob 6 of the voltage regulator 2, and the reading changes accordingly. The adjustable range of load (AC) current is 0 - 1.5 A. After the measurement, disconnect the leakage protector 11.

[0039] Operator error causes a short circuit, and the leakage protector 11 or the fuse 5 of the voltage regulator disconnects the circuit to protect the equipment and personal safety. After troubleshooting, reconnect the leakage protector 11 or replace the fuse 5 of the voltage regulator to resume normal operation.

[0040] To sum up, its box body is made of ABS plastic, which is designed to be lightweight and easy to carry, suitable for on-site mobile use. It has a simple operation and a concise interface, with characteristics such as high temperature resistance and waterproofing, saving costs to the greatest extent while reducing the weight of the whole machine. At the same time, adjustable measured signals of AC voltage 0 - 250V, DC voltage 0 - 250V, DC current 0 - 50mA, DC resistance 0 - 20kΩ, and load (AC) current 0 - 1.5A are integrated into a measurement box, facilitating the measurement of various electrical parameters, simulating a real electrician working scenario, providing an operation experience similar to that in actual work, and having safety measures such as short-circuit protection, overload protection, and leakage protection to ensure the safety of the operator. It can perform various measurement operations to meet different teaching and training needs. It is convenient for operation demonstration and interactive teaching, improving the learning effect.

Claims

1. A multifunctional electrical instrument measuring box, including a voltage regulator. The voltage input end of the voltage regulator is connected to a 220V household power socket through a power cord plug, and an adjustment knob for adjusting voltage output is arranged on the surface of the voltage regulator. It is characterized in that: It further includes a box body. A three-pin plug socket connected to the voltage output end of the voltage regulator is arranged on the side wall of the box body. A leakage protector, a discharge indicator light, an AC voltage measurement terminal, a DC voltage measurement terminal, a DC current measurement terminal, a DC resistance measurement terminal, and an AC current measurement terminal are arranged on the box body. The input end of the leakage protector is connected to the three-pin plug socket, and the output end is respectively connected to the discharge indicator light, the AC voltage measurement terminal, the DC voltage measurement terminal, the DC current measurement terminal, the DC resistance measurement terminal, and the AC current measurement terminal. The discharge indicator light is used to indicate that the box body is powered on when powered on; the AC voltage measurement terminal is used to measure AC voltage; the DC voltage measurement terminal is used to measure DC voltage; the DC current measurement terminal is used to measure DC current; the DC resistance measurement terminal is used to measure DC resistance; the AC current measurement terminal is used to measure AC current.

2. The multifunctional electrician instrument measuring box according to claim 1, characterized in that: The AC voltage measurement terminal includes an AC voltage socket hole arranged on the surface of the box body. The AC voltage socket hole has two jacks, and the two jacks are respectively connected to the L terminal and the N terminal of the output end of the leakage protector.

3. The multifunctional electrical instrument measuring box according to claim 1, wherein: The DC voltage measurement terminal includes a single-phase rectifier bridge and a DC voltage socket hole. Among them, the single-phase rectifier bridge is arranged inside the box body, and its L terminal and N terminal at the input end are respectively connected to the L terminal and the N terminal of the output end of the leakage protector; the DC voltage socket hole is arranged on the surface of the box body and includes two jacks. One jack is connected to the positive pole of the output end of the single-phase rectifier bridge, and the other jack is connected to the negative pole of the output end of the single-phase rectifier bridge.

4. The multifunctional electrician instrument measuring box according to claim 1, characterized in that: The DC current measurement terminal includes a switching power supply, a resistor R1, a first potentiometer, and a DC current socket hole; among them, the DC current socket hole has two jacks. The L terminal and the N terminal at the input end of the switching power supply are respectively connected to the L terminal and the N terminal of the output end of the leakage protector. The positive pole of the output end of the switching power supply is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the input end of the first potentiometer, and the output end of the first potentiometer is connected to one of the jacks of the DC current socket hole; the negative pole of the output end of the switching power supply is connected to the other jack of the DC current socket hole.

5. The multifunctional electrician instrument measuring box according to claim 4, characterized in that: The DC resistance measurement terminal includes a resistor R2, a rocker switch, a second potentiometer, and a DC resistance socket hole; among them, the DC resistance socket hole has two jacks. One end of the resistor R2 is connected to the negative pole of the output end of the switching power supply, the other end of the resistor R2 is respectively connected to the input end of the second potentiometer and one of the jacks of the DC resistance socket hole. One end of the rocker switch is connected to the positive pole of the output end of the switching power supply, and the other end is respectively connected to the output end of the second potentiometer and the other jack of the DC resistance socket hole.

6. The multifunctional electrician instrument measuring box according to claim 1, wherein: The AC current measurement terminal includes a wire under test and a capacitor; the wire under test is disposed on the surface of the box body, one end of the wire under test is respectively connected to one end of the discharge indicator light and the L terminal of the output end of the leakage protector, the other end of the wire under test is connected to one end of the capacitor, and the other end of the capacitor is respectively connected to the other end of the discharge indicator light and the N terminal of the output end of the leakage protector.

7. The multi-functional electrician instrument measuring box according to claim 1, wherein: The box body is made of high-temperature resistant and waterproof ABS plastic material, and the size of the box body is 280 mm in width * 380 mm in length * 130 mm in height.

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