Common problems and solutions of DC resistance tester

DC resistance tester is a commonly used precision instrument in electrical testing, but some problems may be encountered during use. The following are common problems and solutions for DC resistance testers:

1. Power on and burn fuse

① Reason:

5A~10A DC resistance tester: usually the built-in transformer is burned out by high voltage.

DC resistance tester above 20A: It may be a fault with the switching power supply.

② Solution:

Timely replace damaged transformers or switch power supplies.

Maintenance must be carried out by professional engineers. If on-site repair is not possible, it must be returned to the factory for further processing.

2. Unable to measure the resistance value

① Reason:

Power failure: The switch power supply is damaged and there is no current output.

Over range: The set value exceeds the device range, and the program cannot recognize the command.

② Solution:

Power failure: Replace the power supply.

Over range: Restart the instrument and select the resistance or current within the range for measurement.3. Instrument flower screen

① Reason:

Poor contact of internal wiring: Shut down and check if the wiring is loose, and reinforce the wiring.

Electromagnetic interference: causing abnormal screen display.

② Solution:

Loose wiring: Turn off the machine and check and reinforce the wiring.

Electromagnetic interference: Contact the manufacturer and increase the filtering capacitor.

3. Instrument flower screen

① Reason:

Poor contact of internal wiring: Shut down and check if the wiring is loose, and reinforce the wiring.

Electromagnetic interference: causing abnormal screen display.

② Solution:

Loose wiring: Turn off the machine and check and reinforce the wiring.

Electromagnetic interference: Contact the manufacturer and increase the filtering capacitor.

4. Large measurement error

① Reason:

Temperature effect: Temperature deviation leads to measurement errors in resistance.

Wiring resistance: Wiring resistance affects measurement results.

Zero drift phenomenon: circuit aging leads to zero position deviation.

② Solution:

Temperature calibration: Perform temperature calibration before testing.

Reasonably choose the wiring method: avoid generating excessive wiring resistance.

Regular zero offset calibration: reduce the impact of zero drift error.

5. Battery issue

① Reason:

Low battery level: causing the instrument to malfunction.

Battery aging: affecting instrument performance.

② Solution:

Regular charging and discharging: Charge and discharge the battery every three months to extend its service life.

Timely battery replacement: If the battery ages, it needs to be replaced in a timely manner.

6. Other precautions

① Grounding protection: Ensure that the instrument is well grounded to prevent static electricity accumulation and electromagnetic interference.

② Discharge operation: After measuring the inductive load, wait for the discharge indication to be completed before disconnecting the wire to avoid inductive discharge endangering safety.

③ Regular calibration: The instrument is calibrated once a year to ensure the accuracy and stability of the measured values.

Following the above solutions can ensure the normal use and measurement accuracy of the DC resistance tester. If the problem cannot be solved on its own, it is necessary to promptly contact a professional engineer or equipment manufacturer for repair.

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Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com