Transformer DC resistance tester

Feature introduction：
    The instrument is designed for small and medium-sized transformers, it is composed of constant current power supply and voltage signal detection two parts, the test method is simple, stable and reliable. Chinese menu display, high measurement accuracy, easy reading. The output current is adjustable, suitable for measuring the direct resistance of various small and medium-sized transformers.

Main feature：
1．Using new switching power supply technology, the output current stability is good, high power;
2．Advanced signal measurement circuit, low noise, strong anti-interference, real and reliable test data;
3．It has perfect protection functions such as overcurrent, overvoltage, misoperation and discharge.
4．Compact structure, small size, light weight, more suitable for field use;
5．The output current provides multiple gears for a wider range.

Technical index：
1．Output four levels of current：10A、5A、1A、100mA、10mA；                 

2．Range：0.2mΩ-2Ω(10A gear)；0.2mΩ-4Ω(5A)；1Ω-20Ω(1A)；10Ω-200Ω(100mA)；
         100Ω - 2kΩ（10mA）；

3．Resolution ratio：1μΩ； Accuracy：0.2%；
4．Operating temperature：0～40℃； Ambient humidity：≤90%RH，no condensation；
5．Power supply：AC220 V±10%，(50±1) Hz。
System Description ：
1．Power supply: AC 220V; Power switch: control the working power supply of the whole machine, with safety, fusing current 3A;
2．Select key: After the machine is reset, press the select key to select the output current;
3．Test key: After the output current is selected, press this key to automatically complete the whole measurement process;
4．Reset key: Press this key to the initial state of the machine;
5．I+ is the positive end of the output current, V+ is the positive end of the input voltage; I- indicates the negative end of the output current and V- indicates the negative end of the input voltage.