UJ2000 Multi functional DC comparator calibration deviceDetailed product description：

The UJ2000 multifunctional DC comparator calibration device is a DC comparator instrument with high accuracy, wide measurement range, complete functions, and wide applications. Suitable for verifying high-precision potentiometers, standard batteries, standard resistors, DC resistance boxes, DC bridges, and can also be used to measure platinum resistance thermometers and germanium resistance thermometers. It is currently the most ideal and practical calibration device for metrology departments, scientific research and production units.  

technical indicators
The measurement range of this device is:
Voltage: -0.11111111-2.1111110V
Potentiometer: -0.0111111-2.1111110V
Resistance: 10-4-106 Ω

The function of the "potential difference meter" in this device complies with the requirements of the JJG505-87 National Metrological Verification Regulations. Its basic error:

range	Error formula	Minimum step
×1	±1×10-6(Ux+10-1) V	0.1μV
×0.1	±2×10-6(Ux+2×10-2) V	0.01μV

The "bridge" function of this device complies with the requirements of JJG506-87 National Metrological Verification Regulations. The basic error is shown in the table:

Work Anzhe (AT)	Resistance voltage drop (mV)	Primary lap count (T)	Error formula
Iw≥20	UR≥20	Wx≥100	±1×10-6(Rx+10-1RN) (Ω)
Iw≥20	UR≥20	Wx=10	±1.4×10-6Rx (Ω)

The accuracy of measuring standard resistance is shown in the table:

Measurement range (Ω)	ten-4	ten-3ten-2ten-1	100—10four	tenfive	tensix
accuracy	2×10-5	2×10-6	1×10-6	2×10-6	2×10-5