Product Description

QJ31 Wheatstone Kelvin Resistance Bridge

The Type QJ31 Portable Wheatstone / Kelvin Resistant Bridge is designed for the high precision measurement of low resistance, conductivity and calibration of other instruments.

The Portable Wheatstone / Kelvin Bridge has a resistance range from 0.0001ohm to 100ohm for the Kelvin Bridge and 10ohm to 1Mohm for the Wheatstone bridge. The basic accuracy is ± 0.1%.

It is totally self-contained so is suitable for laboratory, workshop and onsite, in the field, applications. As well as laboratory measurements and calibration, the unit is ideal for the measurement of resistance of motors, coils and transformers etc.

FEATURE

• Kelvin bridge with built-in galvanometer
• Range - Kelvin Bridge: 0 to 111.10Ω
• Range - Wheatstone Bridge: 10  to MΩ
• Best resolution: 100 µΩ
• Resistance elements made by high quality alloy material with low temperature coefficient
• Wide measurement range, high accuracy, stability and reliability
• Rugged carry case, suitable for both field and laboratory use
• Battery powered, with input jack and terminals for optional external DC power
• With output terminals for external galvanometer

SPECIFICATION

• Accuracy: ± 0.1% typically
• Galvanometer: Built in
• Galvanometer Sensitivity: 3 μV/mm
• Power: Built in Dry cells 6 x 1.5V
• Dimensions: 320 x 280 x 170 mm
• Weight: Approximately 4.5kg
• Range - Wheatstone Bridge: 10  to MΩ

Multiplier	Measure Range	Resolution	Accuracy
X10	0 ~ 111.10Ω	10mΩ	0.1%
X102	0 ~ 1.1110kΩ	100mΩ	0.1%
X103	0 ~ 11.110kΩ	1Ω	0.1%
X104	0 ~ 111.10kΩ	10Ω	0.2%
X105	0 ~ 1.1110 MΩ	100Ω	0.5%

• Range - Kelvin Bridge: 0 to 111.10Ω

Multiplier	Measure Range	Resolution	Accuracy
X10-2	0 ~ 111.10mΩ	100uΩ	0.1%
X10-1	0 ~ 1.1110Ω	100uΩ	0.1%
X1	0 ~ 11.110Ω	1mΩ	0.1%
X10	0 ~ 111.10Ω	10mΩ	0.1%

SCOPE OF DELIVERY

• QJ31 Wheatstone Kelvin Resistance Bridge
• Factory calibration report
• Test lead set  

OPTIONAL ACCESSORIES

• Accredited calibration certificate (P/N: 9000-QJ31)
• Long measuring test lead: To measure transformer usually requires long measuring lead wire, the cross section of lead wise shall not be too small, i.e. the resistance of each conductor shall not be greater than 0.1Ω.

ORDERING MODEL NUMBER

• Model QJ31