What is the measuring range of the DC resistance tester?
Product characteristics:1 、 the shape is light, easy to carry, test speed.2 、 test current: 5A, 10A, 20A, 50A, 100A3, using imported high-quality components, software design of multiple anti-interference procedures, the accuracy of measurement results, good repeatability.4, can store 255 test data, and print all the test data stored, easy to use. 5 、 LCD display mode, adapt to different working environment.
1. Check the welding quality of the wire and lead in the winding;2. Check whether the contact of each position of the tap changer is good;3. Check whether the winding or lead line is broken or not;4, check the correctness of the shunt, whether there is one or several wires broken by the winding of several parallel wires;5 、 check whether there is short circuit between the layer and turn. This product uses a typical four wire system. In order to improve the accuracy of measuring resistance (especially low resistance). Program controlled constant current source, pre programmed amplifier and A/D converter constitute the main part of measurement circuit. The central control unit through the control of constant current source to the external load to be measured by applying a constant current, high precision, and the obtained data (including test current test voltage, current etc.) for processing, get the actual resistance value.
The DC resistance test of transformer winding is an essential test item for transformer after switching, overhauling and changing tap changer. "Regulations" provisions in the transformer overhaul, repair, alteration, tap position, fault inspection and pre testing, must be DC resistance measurement of transformer winding
