Surface Resistance Tester

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Introduction：
It is simply operated. The user just need place tester on the surface of tested items, and directly read the figure indicated via LED lights. The testing method follows the ASTM D-257.

Specification:

Size	137(L)76(W)30(D)mm
Weight	120g
Accuracy	±1/2 decade
Repeatability	±5%
Testing Voltage	9V
Working Temperature	0℃-50℃
Working RH	0%-90%

Q: What should be paid attention to when measuring the insulation resistance of the cable?: The temperature of the sample shall not be lower than + 5. The outdoor test shall be carried out in good weather, and the relative humidity of the air shall not be higher than 80%.

Q: How to measure the cable resistance and contact resistance of the electric system: Test method for insulation resistance:The measurement usually uses a constant DC voltage at both ends of the tested insulator to measure the magnitude and variation of the DC current flowing through it to determine the merits and resistances of the insulating material.

Q: What is the role of the temperature compensator in the resistance strain measurement? What's the requirement for it?: 1. compensation block compensation method of strain gauge pasted on the measured point in the component is called the work piece, the AB bridge access bridge; in addition to the strain gauge pasted the same specifications with the measured components of the same material but a piece of material is not involved in the deformation, and the component to be measured in the same temperature condition, known as the temperature compensating plate, connecting it with half bridge bridge work piece measuring bridge, another two bridge arm bridge for strain gauge internal fixation without a sense of standard resistance, the composition of arm bridge. The characteristics of the bridge can be seen that as long as the compensation plate is properly connected to the bridge road, the impact of temperature changes can be eliminated.This method does not require 2. work piece compensation compensation sheet and compensation block, but in the same component to be measured is pasted on several working strain gauges, according to the force characteristics and basic components of the bridge, will work correctly access bridge, can eliminate the strain caused by the temperature change of the strain, which needs to be measured get.

Q: Is there a resistance to varistors? How can they be measured? Can they be replaced by ordinary resistors?: Varistor is a kind of semiconductor device with Zinc Oxide as the main raw material. It is also a nonlinear sensitive element. Only in the role of voltage to play a sensitive role in protection. Specific principles, the two floor of the very good.

Q: How do I measure the primary and secondary resistances of ignition coils?: The primary winding has fewer wires and fewer turns, which makes it very low in resistance. The secondary winding has thinner lines and more turns, thus higher resistance. The turns ratio of a car ignition coil is usually about 1:100, that is, the primary coil turns around 1 turns, and the secondary coil turns around the 100 turn. The resistance of the primary coil is usually between 1~4 ohms, and the resistance of the secondary coil is usually between 8000~16000 ohms. The additional resistor in the ignition coil low voltage circuit has the function of balancing the high voltage spark. When the current through the primary coil produce a magnetic field, the magnetic field from the start to pass into the saturation current (which reached the highest level) to experience a period of time. At low engine speeds, the magnetic field can reach saturation at high engine when time is shortened, the magnetic field cannot reach the saturation point, the secondary voltage generated will be insufficient, it will weaken the spark.

Q: Problems encountered in the measurement of digital ohmmeter: In the detection of insulation, the insulation resistance of a time value is not fully reflect the insulation performance of the sample, this is due to the following two reasons, on the one hand, the same insulation material, has large volume when the insulation resistance is small, the volume of the insulation resistance in hours. On the other hand, there is a charge absorption process and polarization process for the insulating material after the addition of high pressure. Therefore, the requirements for power system in main transformer, cable, motor and so on many occasions in the insulation test should measure the absorbance ratio R60s and R15s ratio, and polarization index - R10min and R1min ratio, and uses these data to determine insulation.

Q: Can measuring resistance be continuously measured by circuit?: Resistance to disconnect the electric circuit measurement does not refer to you to break out from the resistance is measured in the otherwise measured is the equivalent resistance value of the system depending on different circuit arrangement is sometimes measured by the resistance value in the actual operation is obviously not feasible so you are advised to make the circuit diagram and and to measure the resistance is calculated by the indirect method for resistance rather than direct measurement

Q: The earth resistance tester is an instrument for measuring the insulation resistance of a line, isn't it?: Because of the grounding resistance are relatively small (less than 0.1), and the insulation resistance are relatively large (minimum in 1M, can reach the maximum of 500M or even infinite), because the ground resistance tester can test the insulation resistance, insulation resistance measurement using insulation resistance meter (megameter) to measure.

Q: How to test the insulation resistance of the 10kV current transformer?: When measuring the non tested winding (or end screen), the shell should be grounded.

Q: How to measure insulation resistance by using ohmmeter: The surface of the material to be tested should be clean, reduce contact resistance, and ensure the accuracy of the measurement results

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