Measurement method of host tachometer measurement tool

Abstract

The invention discloses a measuring method of a host tachometer measuring tool, and belongs to the technical field of industrial automatic telephone monitoring. According to the measuring method, the voltage value of the signal generator is converted into the rotating speed value of the host tachometer, and whether the rotating speed of the host tachometer is accurate or not is determined by comparing the theoretical value with the reading of the tachometer. The range of the tachometer of the main engine is confirmed by controlling the voltage values of different gears of the signal generator, the operation steps are simple, the accuracy of the range of the tachometer can be directly and quickly verified, the possible range deviation problem of the tachometer can be found in time, and a reliable basis is provided for debugging and maintenance of a ship power system.

Description

Technical Field

[0001] The invention relates to a measuring method of a host tachometer measuring tool, and belongs to the technical field of industrial automation monitoring. Background Art

[0002] Based on the ship's main engine system structure and monitoring requirements, tachometer sensors are rationally arranged at key locations such as the main engine crankshaft, gearbox output shaft, and propeller shaft to ensure that they can fully and accurately reflect the speed of the main engine and related transmission components. After the main engine tachometer arrives and is installed on board, the main engine rotation direction and the tachometer readings installed in various positions need to be measured and confirmed so that problems can be promptly addressed to ensure project completion. Existing technology for measuring the accuracy of the main engine tachometer requires that all relevant systems be powered on and debugged normally, and then measured using the ±30rpm test switch on the signal acquisition device. Because there is only one test gear, other speeds cannot be measured, and the accuracy of other speeds cannot be determined. Once a problem occurs, it will seriously affect the completion time. Summary of the Invention

[0003] To address the existing issues, the present invention uses a single tool to confirm the accuracy of the engine tachometer in advance, eliminating the need to install the tachometer on board. This tool is also suitable for measuring the accuracy of other low-voltage measuring instruments of the same type.

[0004] The technical solution adopted by the present invention is: a measurement method of a host tachometer measuring tool, the measuring tool comprising a signal generator and a measuring needle, the measuring needle being electrically connected to the signal generator; the accuracy of the signal generator is ±0.001V / mA, and the range is 0~±25V / mA;

[0005] The measurement method includes the following steps:

[0006] S1. After turning on the signal generator, adjust the operating voltage to 0~15V DC according to the host tachometer;

[0007] S2. Connect the measuring needle to the positive and negative poles of the host tachometer:

[0008] If the positive electrode of the measuring needle is connected to the positive electrode of the host tachometer, the host tachometer will rotate forward;

[0009] If the positive electrode of the measuring needle is connected to the negative electrode of the host tachometer, the host tachometer will be reversed;

[0010] S3. The theoretical conversion relationship between the speed of the host tachometer and the voltage of the signal generator:

[0011] For 0-100 RPM tachometer, the conversion factor C 100 = 10RPM / 1V, that is, the speed of the host tachometer corresponding to the voltage of 1V of the signal generator is 10RPM;

[0012] For 0-150 RPM tachometer, the conversion factor C 150 = 15RPM / 1V, that is, the speed of the host tachometer corresponding to the voltage of 1V of the signal generator is 15RPM;

[0013] S4. Check whether the range of the host tachometer is accurate by controlling the voltage values ​​of different gears of the signal generator.

[0014] Furthermore, in step S4, the method for confirming whether the range of the host tachometer is accurate by controlling the voltage values ​​of different gears of the signal generator is:

[0015] S4.1 The theoretical value of the engine tachometer is obtained by multiplying the voltage setting value of the signal generator by the conversion coefficient of the engine tachometer;

[0016] S4.2 Compare the theoretical value of the main engine tachometer with the dial indication on the main engine tachometer. If the values ​​are consistent, it means that the range of the main engine tachometer is accurate; otherwise, it means that the range of the main engine tachometer is inaccurate.

[0017] The beneficial effects of the present invention are as follows: the main structure and signal output accuracy of the present invention are controlled, the output signal accuracy is ±0.001V / mA, and the range is 0~±25V / mA. When measuring, it is necessary to select the appropriate gear in advance to avoid exceeding the range and damaging the device to be measured. The present invention is suitable for low-working voltage meters such as tachometers with different ranges. The forward and reverse rotation of the host tachometer is determined by measuring the positive and negative connection method of the meter needle. The operation is simple and the logic is clear. It does not require complex equipment or additional technical means to quickly determine the rotation direction of the tachometer, which is convenient for subsequent measurement work.

[0018] The main engine tachometer range is confirmed by controlling the voltage values ​​of different gears of the signal generator. The operation steps are simple and can directly and quickly verify the accuracy of the tachometer range, and promptly discover possible range deviation problems of the tachometer, providing a reliable basis for the commissioning and maintenance of the ship's power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a physical picture of the measuring tools: signal generator and measuring needle.

[0020] Figure 2 This is a photo of the 1-150 RPM tachometer at full scale and the signal generator.

[0021] Figure 3 This is a diagram of the measurement results in Example 1.

[0022] Figure 4 This is a diagram of the measurement results in Example 2. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below through examples. It is necessary to point out that the following examples are only used to further illustrate the present invention, but are not limited thereto, unless otherwise specified.

[0024] A measuring method for a host tachometer measuring tool, the measuring tool comprising a signal generator and a measuring needle, the measuring needle being electrically connected to the signal generator; the signal generator having an accuracy of ±0.001 V / mA and a measuring range of 0 to ±25 V / mA;

[0025] The measurement method includes the following steps:

[0026] S1. After turning on the signal generator, adjust the operating voltage to 0~15V DC according to the host tachometer;

[0027] S2. Connect the measuring needle to the positive and negative poles of the host tachometer:

[0028] If the positive electrode of the measuring needle is connected to the positive electrode of the host tachometer, the host tachometer will rotate forward;

[0029] If the positive electrode of the measuring needle is connected to the negative electrode of the host tachometer, the host tachometer will be reversed;

[0030] S3. The theoretical conversion relationship between the speed of the host tachometer and the voltage of the signal generator:

[0031] For 0-100 RPM tachometer, the conversion factor C 100 = 10RPM / 1V, that is, the speed of the host tachometer corresponding to the voltage of 1V of the signal generator is 10RPM;

[0032] For 0-150 RPM tachometer, the conversion factor C 150 = 15RPM / 1V, that is, the speed of the host tachometer corresponding to the voltage of 1V of the signal generator is 15RPM;

[0033] S4. Check whether the range of the host tachometer is accurate by controlling the voltage values ​​of different gears of the signal generator.

[0034] In some specific embodiments, in step S4, the method for confirming whether the range of the host tachometer is accurate by controlling the voltage values ​​of different gears of the signal generator is:

[0035] S4.1 The theoretical value of the engine tachometer is obtained by multiplying the voltage setting value of the signal generator by the conversion coefficient of the engine tachometer;

[0036] S4.2 Compare the theoretical value of the main engine tachometer with the dial indication on the main engine tachometer. If the values ​​are consistent, it means that the range of the main engine tachometer is accurate; otherwise, it means that the range of the main engine tachometer is inaccurate.

[0037] Example 1

[0038] In this embodiment, the range of the engine tachometer is measured from 0 to 150 RPM.

[0039] Figure 1 It shows that the main structure of the present invention is composed of a signal generator and a measuring needle. By adjusting the output voltage, the host tachometer of different ranges can be measured.

[0040] S1. After turning on the signal generator, adjust the gear to the appropriate level according to the operating voltage of the host tachometer, generally 0~15V DC.

[0041] S2. Connect the measuring needle to the host tachometer, with the positive pole of the measuring needle facing the positive pole of the host tachometer. The tachometer is rotating forward.

[0042] S3. When the host tachometer is at full scale, i.e. 150RPM, the voltage of the signal generator is 10.000V, which corresponds to the conversion coefficient C of the tachometer. 150 = 15RPM / 1V, that is, the voltage of the signal generator 1V corresponds to the speed of the host tachometer is 15RPM; (such as Figure 2 shown)

[0043] S4, set the voltage of the signal generator to 4.230V, the theoretical value of the host tachometer to 63.45RPM, and Figure 3 The reading of the main engine tachometer is 62.00RPM, so the range of the main engine tachometer is inaccurate.

[0044] Example 2

[0045] In this embodiment, the range of the engine tachometer is measured from 0 to 100 RPM.

[0046] Figure 1 It shows that the main structure of the present invention is composed of a signal generator and a measuring needle. By adjusting the output voltage, the host tachometer of different ranges can be measured.

[0047] S1. After turning on the signal generator, adjust the gear to the appropriate level according to the operating voltage of the host tachometer, generally 0~15V DC.

[0048] S2. Connect the measuring needle to the host tachometer, with the positive pole of the measuring needle facing the negative pole of the host tachometer, and the tachometer is reversed.

[0049] S3. When the host tachometer is at full scale (100RPM), the voltage of the signal generator is 10.000V, which corresponds to the conversion coefficient C of the tachometer. 100 = 10RPM / 1V, that is, the speed of the host tachometer corresponding to the voltage of 1V of the signal generator is 10RPM;

[0050] S4, set the voltage of the signal generator to 8.000V, the theoretical value of the host tachometer to 80RPM, and Figure 3 The reading of the main engine tachometer is 80RPM, so the range of the main engine tachometer is accurate.

[0051] The above embodiments are only used to illustrate the present invention. Any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A measuring method for a host tachometer measuring tool, characterized in that: The measuring tool includes a signal generator and a measuring needle, which is electrically connected to the signal generator; the accuracy of the signal generator is ±0.001V / mA, and the range is 0~±25V / mA; The measurement method includes the following steps: S1. After turning on the signal generator, adjust the operating voltage to 0~15V DC according to the host tachometer; S2. Connect the measuring needle to the positive and negative poles of the host tachometer: If the positive electrode of the measuring needle is connected to the positive electrode of the host tachometer, the host tachometer will rotate forward; If the positive electrode of the measuring needle is connected to the negative electrode of the host tachometer, the host tachometer will be reversed; S3. The theoretical conversion relationship between the speed of the host tachometer and the voltage of the signal generator: For 0-100 RPM tachometer, the conversion factor C 100 = 10RPM / 1V, that is, the speed of the host tachometer corresponding to the voltage of 1V of the signal generator is 10RPM; For 0-150 RPM tachometer, the conversion factor C 150 = 15RPM / 1V, that is, the speed of the host tachometer corresponding to the voltage of 1V of the signal generator is 15RPM; S4. Check whether the range of the host tachometer is accurate by controlling the voltage values ​​of different gears of the signal generator.

2. The measuring method of the host tachometer measuring tool according to claim 1, characterized in that: In step S4, the method for confirming whether the range of the host tachometer is accurate by controlling the voltage values ​​of different gears of the signal generator is as follows: S4.1 The theoretical value of the engine tachometer is obtained by multiplying the voltage setting value of the signal generator by the conversion coefficient of the engine tachometer; S4.2 Compare the theoretical value of the main engine tachometer with the dial indication on the main engine tachometer. If the values ​​are consistent, it means that the range of the main engine tachometer is accurate; otherwise, it means that the range of the main engine tachometer is inaccurate.

Images