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Solutions to problems with DC resistance tester

time:2020/12/18   source:华天电力  reading:274 time

The DC resistance tester is an ideal device for the DC resistance of lateral transformer windings and high-power inductance equipment. In practical applications, some users have reported that the equipment will malfunction during use.


1. The insurance will be burned as soon as the DC resistance tester is turned on:


There are two situations when the insurance is turned on: 5A~10A direct resistance meter. Generally speaking, the built-in transformer is burned out by the high voltage, which makes the instrument unable to be used normally. This happens to the direct resistance meter with current above 20A. Usually there is a problem with the switching power supply.


In case of insurance burning, you only need to replace the transformer or switching power supply in time for normal use. When repairing the equipment, a professional engineer must disassemble the equipment. If repair conditions are not available on site, return to the factory for repair.


Transformer DC Winding Resistance Tester.png


2. Using a DC resistance tester, but the resistance value cannot be measured:


There are generally two reasons for the undetectable value: 1. The switching power supply is broken and there is no current output. 2. The set value exceeds the device range, and the program cannot recognize the command.


If the power supply is damaged, just replace the power supply. If it is over-range, restart the instrument and select the resistance or current within the range for measurement.


3. Fuzzy screen appears during the test of the DC resistance tester:


The screen of the direct resistance meter is most likely to be in poor contact with the internal cable. Turn off the cable and check whether the cable is loose. Reinforce the cable to solve the problem.


Another possibility is that the screen display is abnormal due to electromagnetic interference. If this is the reason, just contact the manufacturer and add a filter capacitor.


In addition to the quality of the equipment itself, unreasonable operation methods and storage methods can also cause damage to the equipment. During use, do not touch the LED screen with high temperature objects. Check whether the input interface fixture is normal before testing; in addition, keep the equipment Dry cleaning is also an effective method to prolong the service life; in addition, for the special requirements of the testing equipment measurement, it is good to calibrate the equipment once a year to ensure the accuracy and stability of the measured value.


What to do if the DC resistance tester has a flickering condition:


1. Poor internal cable contact: turn off the cable and check if the cable is loose, just reinforce the cable.


2. Electromagnetic interference causes abnormal screen display: just contact the manufacturer and add a filter capacitor.


In addition, the daily operation of the operator will also affect the service life of the instrument. Therefore, we should not touch the LED screen with high temperature objects when using the DC resistance tester. Before testing, check whether the input interface fixture is normal. In addition, keeping the equipment dry and clean is also an effective way to extend the service life.

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