QJ84 and QJ84A digital DC electric bridge is our unique upgraded product for Kelvin bridge, which is based on circuit of electric bridge, and use precision alloy winding resistance as a benchmark. It is not only characterized by wide range, convenient, fast and arresting like digital multi-meter, but also inherited advantage of accuracy, stability and reliability of Kelvin bridge. The DC electric bridge is an ideal product for the measurement of low DC resistance in enterprises, laboratories, measuring department as well as research institutes.
- Accurate: accuracy better than same type DC resistance bridge with external galvanometer.
- Convenient: only need to connect resistors under test, select correct range, whole test procedure without any manual operation.
- Rapid: sampling time takes only 0.4S, normally stable data can be displayed within several seconds.
- Arresting: adopt 200mm large digit display, clear and legible.
- Stable: main standard resistor is winded by precision manganin wire, which ensures stability better than 0.02%.
- Reliable: main components are imported and via special selection and aging treatment.
Main Technical Specification
- Measuring range: 0~20KΩ 7 ranges
- Minimum resolution: 1μΩ
- Main parameter under each range
Range 20mΩ 200mΩ 2Ω 20Ω 200Ω 2kΩ 20kΩ Meas.range 0~19.999mΩ 0~199.99mΩ 0~1.9999Ω 0~19.999Ω 0~199.99Ω 0~1.999kΩ 0~19.999kΩ Resolution 1μΩ 10μΩ 100μΩ 1mΩ 10mΩ 100mΩ 1Ω Accuracy class 0.5 0.1 0.05 0.05 0.05 0.05 0.05 Test current 1A 1A 100mA 100mA 10mA 1mA 100μA Model QJ84 QJ84A Display 41/2 digit LED display 41/2 digit LCD display Power supply AC 220V 50Hz DC 9V (5pcs NiMH rechargeable battery pack) Dimension 265(W)x110(H)x295(D)(mm) 320(W)x280(H)x170(D)(mm) Weight 2.5kg(approx.) 6kg(approx.)
- It is able to substitute QJ42, QJ44, QJ57 DC double bridge, which is the best product to measure resistance of core wire in wire and cable industry.
- Basic parameter of QJ84A is same as QJ84, while supplied by specialized battery pack and charger, which is suitable for field test without AC power supply.