Fluke 720A Kelvin-Varley

Voltage Divider

The Fluke Calibration 720A Kelvin-Varley Divider is a primary standard designed for precision ratio measurements. It provides 0.1 ppm resolution across seven decades. Absolute linearity is specified at ±0.1 ppm of input and can be restored through an internal self-calibration function. The unit supports a ratio range up to 1.1 and accepts input voltages up to 1100 V.

Product Info Related Products

Ratio range	0 - 1.0 (1.0 input tap); 0 - 1.1 (1.1 input tap)
Resolution	0.1 ppm of input; seven decades
Absolute linearity	±0.1 ppm of input at dial settings 1.1 - 0.1; ±0.1(10S) 1/3 of input at dial settings 0.1 - 0
Absolute linearity stability (no self-cal)	±1.0 ppm of input/yr at dial settings 1.1 - 0.1; ±1.0(10S)(2/3) ppm of input/yr at dial settings 0.1 - 0
Temperature coefficient of linearity	±0.05 ppm of input/°C max at dial settings 1.1 - 0.1
Short-term linearity stability	±0.01 ppm/24 h; ±0.1 ppm/30 d (temperature within ±1 °C; applied voltage ≤100 V)
Power coefficient of linearity	±0.2 ppm of input/W max at dial settings 1.1 - 0.1; ±0.2(10S)² ppm of input/W max at dial settings 0.1 - 0
Maximum end errors	Zero error at output low: 0.004 ppm of input; zero error at input low: 0.05 ppm of input; full-scale error: 0.05 ppm of input
Maximum input voltage	1000 V (1.0 input terminal); 1100 V (1.1 input terminal)
Thermal voltages	±0.5 µV max
Input resistance (at 25 °C)	100 kΩ ±0.005% (1.0 input terminal); 110 kΩ ±0.005% (1.1 input terminal)
Temperature coefficient of input resistance	±1 ppm/°C max
Physical (size, mount, weight)	14 cm H × 48.2 cm W × 33 cm D; rack mounted; 8.15 kg

Versatility in wide variety of measurement and control applications
Rigidly mounted with slides
Meets shock requirements of MIL-T-945A and MIL-S901B
Meets vibration requirements of MIL-T-945A
Capable of use in conjunction with a DC voltage source, null detector and lead compensator

SKU: FLUK-720A