QJ84A Digital DC Dual arm Bridge (Portable)Detailed product description：

The QJ84A digital DC double arm bridge (portable) is the best product in the wire and cable industry for testing core wire resistance.

Can replace QJ42, QJ44, and QJ57 DC double arm bridge (Kelvin bridge).
The digital DC bridge series has been awarded the Shanghai High tech Achievement Transformation Project.

model	QJ84A Digital DC (Dual Arm) Bridge (Portable)
measurement range	0-20k Ω seven range range
Minimum resolution	1μΩ
range	measurement range	resolution	test current	accuracy class
20mΩ	0-19.999mΩ	1μΩ	1A	0.5%
200mΩ	0-199.99mΩ	10μΩ	1A	0.1%
2Ω	0-1.9999Ω	100μΩ	100mA	0.05%
20Ω	0-19.999Ω	1mΩ	100mA	0.05%
200Ω	0-199.99Ω	10mΩ	10m A	0.05%
2kΩ	0-1.9999kΩ	100mΩ	1m A	0.05%
20kΩ	0-19.999kΩ	1Ω	100μA	0.05%
display	4 1/2 LED digital tube
power supply	AC/DC dual-purpose power supply AC220V/DC6V (5 nickel hydrogen rechargeable batteries)
size	(W)320 mm×(H)280 mm×(D)170mm
weight	6kg

The basic parameters of QJ84A digital portable wide range DC double arm bridge are the same as those of QJ84. Powered by batteries and suitable for on-site use without AC power supply. It is an upgraded product of our factory's Kelvin bridge, which is based on the bridge circuit and uses precision alloy wound resistors as the benchmark. They not only have the same simple, fast, and eye-catching features as digital multimeters. At the same time, it inherits the advantages of accurate, stable, and reliable Kelvin (double arm bridge) bridge. It is an ideal product for precision measurement of various types of DC low value resistors by industrial and mining enterprises, scientific research units, colleges and universities, and metrology departments.
Accuracy is superior to that achieved by an external galvanometer connected to a DC resistance bridge of the same level.
Simply connect the tested resistor and select the appropriate range, without the need for manual operation during the testing process.
The fast sampling time is 0.4 seconds, and stable data can generally be displayed within a few seconds.
Featuring a 200mm large digital display, the handwriting is clear and easy to read.
The stable main reference resistor is made of precision manganese copper alloy wire winding. Stability is better than 0.02%.
The reliable main components are imported original and specially selected for aging.