JL3007 AC/DC dual-purpose resistance tester

The DC resistance test of transformer windings is a test item for transformers after handover, major repairs, and changes to tap changers. By measuring the DC resistance of the transformer winding, the welding or connection quality of the leads, the presence of inter turn short circuits or open circuits in the winding, and the good contact of the tap changer can be checked. In the past, QJ44 double arm bridge was used to measure direct resistance, and the measurement current of this type of bridge is in the milliampere range, which requires a long measurement time and low accuracy.

This product is a high-precision replacement for DC single and double arm bridge.JL3007 AC/DC dual-purpose resistance tester(1A) adopts the switching power supply technology of *, which is more than 100 times faster than the bridge in measurement speed. The display part displays the measurement results on a four and a half digit LCD liquid crystal display, and the three and a half digit LCD liquid crystal displays the ambient temperature or test current value. It overcomes the disadvantage of other similar products that are inconvenient to read under sunlight with LED display values, and also has automatic arc extinguishing function. This instrument has the advantages of fast speed measurement, high accuracy, intuitive display, strong resistance, small size, low power consumption, stable and reliable test data, and is not affected by human factors. The instrument is equipped with a rechargeable battery pack (12V), which can be used for both AC and DC, making it convenient for on-site and field testing.

This product complies with the requirements of DLT 845.3-2004 "General Technical Conditions for Resistance Measuring Devices Part 3: DC Resistance Tester".

Product Features:

Fast testing speed: This instrument has a large output charging current of up to 1A, which can effectively compensate for the inertia of the current of large inductive devices during measurement, accelerate the saturation of the iron core, shorten the charging time, and improve the testing speed. It is hundreds of times faster than traditional single and double arm bridge instruments.

High accuracy: In addition to using the four terminal measurement method of *, this instrument also adopts the constant current power supply technology of *, which keeps the charging current of inductive loads at a relatively stable value, with stable anti inductance ability and strong anti * force, thereby ensuring measurement accuracy. And using imported components from abroad, the measurement results have high accuracy and good repeatability.

◆ Wide measurement range: The resistance measurement range is 1 μ Ω～ 2K Ω, with a wide range.

◆ Dual use of AC and DC: This instrument comes with a rechargeable battery pack, powered by AC and DC, and is designed to be portable, making it easy to use and carry.

Technical Specifications:

1. Usage conditions:
Environmental temperature: 0 ℃~40 ℃;
Relative temperature: ≤ 85% RH.
2. Measurement range:
This machine has six range settings, including:
1μΩ～20mΩ;
20 mΩ～200mΩ;
0.2Ω to 2Ω;
2Ω to 20Ω;
20Ω to 200Ω;
200Ω～2kΩ。
3. Measurement accuracy: 0.2 level
4. High resolution: 1 μ Ω
5. Constant current source:
1A（1μΩ～20mΩ、20 mΩ～200mΩ、0.2Ω～2Ω）；
100mA(2Ω～20Ω)；
10mA（20Ω～200Ω）；
1mA（200Ω～2kΩ）。
6. Working voltage:
直流： 11V～14V；
Communication: 220V.
7. Power consumption: ≤ 15W
8. Dimensions: 365 × 330 × 180mm3
9. Weight: 5kg (including testing pliers and testing wire)

JL3007 AC/DC dual-purpose resistance tester