Common faults and troubleshooting methods of DC resistance testers

When using a DC resistance tester, if a fault is encountered, corresponding solutions can be taken according to the type of fault:

1. If there is no display after startup, it may be due to the lack of AC 220V. At this point, it is necessary to check the power cord and fuse.

2. If the display is abnormal, it may be due to a malfunction in the motherboard or monitor. In this case, it is recommended to check the computer motherboard or replace the monitor.

3. The resistance value cannot be measured during normal testing, which may be caused by two reasons: the switch power supply is broken, resulting in no current output; Or the set resistance value exceeds the device range, causing the program to be unable to recognize instructions. If the power supply is damaged, replace it; If the set value exceeds the device range, restart the instrument and select the resistance or current within the range for measurement.

4. If there is a blurred screen during the experiment, it is likely due to poor contact of the internal wiring. At this point, the power should be turned off to check if the ribbon cables are loose and reinforce them. Another possibility is that electromagnetic interference may cause abnormal screen display. In this case, the manufacturer can be contacted to add a filtering capacitor.

5. Special attention should also be paid to the situation where the DC resistance tester burns the fuse as soon as it is turned on. For 5A~10A DC resistance meters, this situation is usually caused by high voltage burning out the built-in transformer, resulting in the instrument being unable to function properly; The occurrence of this situation in a DC resistance meter with a current above 20A may be due to other reasons.

ZC-205A Transformer DC Resistance Rapid Tester is our company’s latest professional transformer DC resistance testing equipment, mainly used for DC resistance testing of transformers in power systems. The instrument adopts a large LCD display, full Chinese menu, user-friendly human-machine interface, complete functions, and convenient operation. It is an ideal instrument for power systems and transformer manufacturers to conduct transformer DC resistance testing.

The main advantages of the product are:

① Powerful: It can measure all results of three-phase windings and automatically calculate the three-phase imbalance rate

② Fast testing speed: The equipment adopts an efficient and fast DC power supply with an open voltage of 24V, which can quickly charge and discharge the transformer winding

③ High measurement accuracy: Using a high-precision AD converter combined with a CPU and a DSP chip to ensure measurement accuracy and anti-interference ability

④ Equipped with protection mechanism: equipped with comprehensive overcurrent protection and wiring inspection functions internally

⑤ Online operation: Using RS232 interface to control instrument testing and sequencing

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