Portable device for measuring resistance value between polar plates of liquid resistor

Abstract

The utility model provides a portable device for measuring a resistance value between polar plates of a liquid resistor, which relates to the technical field of resistance measurement, and comprises a main control circuit, a current generating circuit, a voltage detecting circuit, a display driving circuit and a battery, the main control circuit is respectively connected with the current generating circuit, the voltage detecting circuit, the display driving circuit and the battery; the current generation circuit is used for generating constant current under the control of the main control circuit to flow through a movable pole plate and a fixed pole plate of the liquid resistor, the voltage detection circuit is used for detecting the voltage between the movable pole plate and the fixed pole plate of the liquid resistor, and the main control circuit obtains the resistance value of the liquid resistor by dividing the voltage by the current. The display driving circuit is used for displaying the resistance value of the liquid resistor in real time, so that the resistance value of the liquid resistor can be visually seen, the problem that the resistance value of the existing liquid resistor is inconvenient to measure is solved, and the liquid resistor is suitable for measuring the resistance value of the liquid resistor.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance measurement, in particular to a portable device for measuring the resistance value between liquid resistor plates. Background Art

[0002] During the start-up and operation of asynchronous winding motors, a device called "liquid resistor" is required. Due to the characteristics of liquid resistors, seasonal temperature changes or water evaporation may cause changes in resistance value, eventually leading to motor start failure and even grid collapse. Therefore, it is particularly important to regularly measure the resistance between the plates of liquid resistors.

[0003] In the common test method for the resistance between the plates of the existing liquid resistor, a voltage regulator, two multimeters, a circuit breaker and several cables are required. At the test site, the instrument needs to be connected to the circuit and connected to the moving plate and the fixed plate of the liquid resistor. When measuring, it is necessary to observe the multimeter reading, adjust the output voltage of the voltage regulator to prevent the current from burning the cable, the ammeter and the voltage regulator, observe the voltage meter and the ammeter data, and record them at the same time, and finally calculate the liquid resistance value through the R=U / I formula. This measurement method is relatively complicated and inconvenient, and because the data of two multimeters need to be recorded at the same time, there may be a reading deviation caused by the time difference, which makes the calculated liquid resistance value inaccurate. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a portable device for measuring the resistance value between the plates of a liquid resistor, so as to solve the problem that the resistance value measurement of the existing liquid resistor is inconvenient.

[0005] The utility model adopts a technical solution to solve the above technical problems: a portable device for measuring the resistance value between the plates of a liquid resistor, comprising a main control circuit, a current generating circuit, a voltage detecting circuit, a display driving circuit and a battery, wherein the main control circuit is respectively connected to the current generating circuit, the voltage detecting circuit, the display driving circuit and the battery; the current generating circuit is used to generate a constant current flowing through the moving plate and the fixed plate of the liquid resistor under the control of the main control circuit, the voltage detecting circuit is used to detect the voltage between the moving plate and the fixed plate of the liquid resistor, the main control circuit obtains the resistance value of the liquid resistor by dividing the voltage by the current, and the display driving circuit is used to display the resistance value of the liquid resistor in real time.

[0006] Furthermore, the portable device for measuring the resistance value between the plates of a liquid resistor also includes a power rectification circuit, which is connected to the battery and is used to charge the battery.

[0007] Furthermore, the portable device for measuring the resistance value between the plates of a liquid resistor also includes a power switch button, and the power switch button is used to disconnect the battery power supply.

[0008] Furthermore, the portable device for measuring the resistance value between the plates of a liquid resistor also includes a stop button, which is used to stop the current generating circuit and the voltage detecting circuit from working, and the display driving circuit displays the resistance value of the liquid resistor when the stop button is pressed.

[0009] The beneficial effects of the utility model are as follows: the utility model provides a portable device for measuring the resistance value between the plates of a liquid resistor, comprising a main control circuit, a current generating circuit, a voltage detecting circuit, a display driving circuit and a battery, wherein the main control circuit is respectively connected to the current generating circuit, the voltage detecting circuit, the display driving circuit and the battery; the current generating circuit is used to generate a constant current flowing through the moving plate and the fixed plate of the liquid resistor under the control of the main control circuit, the voltage detecting circuit is used to detect the voltage between the moving plate and the fixed plate of the liquid resistor, the main control circuit obtains the resistance value of the liquid resistor by dividing the voltage by the current, and the display driving circuit is used to display the resistance value of the liquid resistor in real time, thereby the resistance value of the liquid resistor can be intuitively seen, solving the problem of inconvenient resistance value measurement of the existing liquid resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is a schematic diagram of the connection relationship of a portable device for measuring the resistance value between liquid resistor plates. DETAILED DESCRIPTION

[0011] The utility model aims to solve the problem that the resistance value of the existing liquid resistor is inconvenient to measure, and provides a portable device for measuring the resistance value between the plates of a liquid resistor, such as Figure 1 As shown, it includes a main control circuit, a current generating circuit, a voltage detection circuit, a display driving circuit and a battery, and the main control circuit is respectively connected to the current generating circuit, the voltage detection circuit, the display driving circuit and the battery; the current generating circuit is used to generate a constant current flowing through the moving electrode plate and the fixed electrode plate of the liquid resistor under the control of the main control circuit, the voltage detection circuit is used to detect the voltage between the moving electrode plate and the fixed electrode plate of the liquid resistor, the main control circuit obtains the resistance value of the liquid resistor by dividing the voltage by the current, and the display driving circuit is used to display the resistance value of the liquid resistor in real time.

[0012] Furthermore, the portable device for measuring the resistance value between the plates of a liquid resistor also includes a power rectification circuit, which is connected to a battery and is used to charge the battery. Thus, the battery can be charged by AC power, and the battery can be a 7.4V lithium battery.

[0013] Furthermore, the portable device for measuring the resistance value between the plates of a liquid resistor also includes a power switch button, and the power switch button is used to disconnect the battery power supply.

[0014] Furthermore, the portable device for measuring the resistance value between the plates of a liquid resistor also includes a stop button, which is used to stop the current generating circuit and the voltage detecting circuit from working, and the display driving circuit displays the resistance value of the liquid resistor when the stop button is pressed.

[0015] Specifically, the method of using the portable device for measuring the resistance value between the plates of a liquid resistor is as follows: connect the current generating circuit to the moving plate and the static plate of the liquid resistor, and connect the voltage detection circuit to the moving plate and the static plate of the liquid resistor, turn on the power switch, and observe the resistance value displayed by the display driving circuit. When the displayed resistance value fluctuates slightly, such as the fluctuation range is within a few ohms, press the stop button and read the resistance value displayed by the display driving circuit at this time as the resistance value of the liquid resistor.

[0016] Compared with the existing liquid resistor resistance value measurement, the portable device for measuring the resistance value between the plates of the liquid resistor provided by the utility model is more convenient and safer and is also easy to carry.

Claims

1. A portable device for measuring resistance between liquid resistor plates, characterized in that: It includes a main control circuit, a current generating circuit, a voltage detection circuit, a display driving circuit and a battery, wherein the main control circuit is connected to the current generating circuit, the voltage detection circuit, the display driving circuit and the battery respectively; the current generating circuit is used to generate a constant current flowing through the moving electrode plate and the fixed electrode plate of the liquid resistor under the control of the main control circuit, the voltage detection circuit is used to detect the voltage between the moving electrode plate and the fixed electrode plate of the liquid resistor, the main control circuit obtains the resistance value of the liquid resistor by dividing the voltage by the current, and the display driving circuit is used to display the resistance value of the liquid resistor in real time.

2. The portable device for measuring the resistance between the plates of a liquid resistor according to claim 1, characterized in that: It also includes a power rectification circuit, which is connected to the battery and is used to charge the battery.

3. The portable device for measuring the resistance between the plates of a liquid resistor according to claim 1, characterized in that: It also includes a power switch button, which is used to disconnect the battery power supply.

4. The portable device for measuring the resistance between liquid resistor plates according to claim 1, characterized in that: It also includes a stop button, which is used to stop the current generating circuit and the voltage detecting circuit from working, and the display driving circuit displays the resistance value of the liquid resistor when the stop button is pressed.

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