As the core equipment of electrical testing, the accuracy of resistance tester directly affects the safety assessment of circuits. This article systematically summarizes the common causes and solutions of faults in resistance testers in Yangon. Let's take a look together

Measurement module failureOxidation of test probes, internal relay faults, or damage to ADC conversion chips can cause measurement drift or no readings. Regularly clean the surface of the probe and use sandpaper to remove the oxide layer; Check the contact status of the relay and replace it with a relay of the same specification if necessary; Calibrate or replace the ADC module to ensure the accuracy of digital signal conversion.

Abnormal power systemAging lithium batteries, power adapter failures, or internal voltage regulation circuit failures can cause unstable power supply. The battery capacity needs to be checked, and if the voltage is below the threshold, it needs to be replaced; Check the output voltage of the adapter to ensure it meets the equipment requirements; Check the status of the power board filter capacitor and voltage regulator chip, repair virtual soldering or replace faulty components.

Software configuration errorImproper range setting, loss of calibration parameters, or firmware bugs can lead to measurement errors. System self calibration program needs to be executed to restore the factory calibration values; Check if the range selection matches the measured resistance range; Upgrade the device firmware to the latest version and fix known measurement algorithm vulnerabilities.

Environmental interference and operational issuesStrong electromagnetic fields, high temperature and humidity environments, or improper operation (such as probe short circuits) can cause measurement deviations. Equipment should be used in a shielded environment, away from sources of interference such as frequency converters and motors; Improve the storage environment of equipment and avoid direct sunlight or humid environments; Standardize the operating procedures to avoid severe collisions or pulling of cables by probes.

When repairing, the principle of "external first, internal second, soft first, hard second" should be followed, and professional tools such as multimeters and calibrators should be used to locate the fault point. Regular maintenance (such as cleaning and battery care) can extend the lifespan of equipment and ensure measurement accuracy. If encountering complex faults, it is recommended to contact professional maintenance agencies for system testing and chip level maintenance to ensure stable and reliable equipment performance.