This item is a good condition used Fluke 720A Kelvin-Varley Divider. This unit has been performance verified in our lab but not formally calibrated. All pictures are of the actual unit.
This item comes with a 6 Month (180 day) warranty. Every pre-owned unit we offer goes through meticulous inspection and NIST calibration to guarantee its reliability and durability.
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Fluke 720A Kelvin-Varley Divider Primary Ratio Standard 0.1ppm Linearity
Model 720A Kelvin-Varley Divider is a high-resolution primary ratio standard with absolute linearity of 0.1 ppm, temperature coefficient of linearity of 0.1 ppm/ºC, and self-calibration capability.
- 0.1 ppm resolution, seven decades
- 0.1 ppm of input absolute linearity
- Built-in self calibration bridge
- Front panel self-calibration
Ratio range
0 to 1.0 (1.0 input tap) and 0 to 1.1 (1.1 input tap)
Resolution
0.1 ppm of input with seven decades
0.2
Absolute linearity
(At calibration temperature and without the use of a correct chart) ±1.0 ppm of input at dial
settings of 1.1 to 0.1, ±0.1 (10S)1/3 of input at dial settings (S) of 0.1 to 0
Absolute linearity stability
(Without self-calibration) ±1.0 ppm of input/yr at dial settings of 1.1 to 0.1, ±1.0 (10S)(2/3) ppm
of input/yr at dial setting (S) of 0.1 to 0
Note: Absolute linearity is defined as the linearity between max and min output voltages. The self-calibration procedure may be used at any time to reset absolute linearity to ±0.1 ppm of input.
Temperature coefficient of linearity
±0.05 ppm of input ºC maximum at dial settings of 1.1 to 0.1
Short-term linearity stability
Under typical standards laboratory conditions (temperature maintained within ± 1 ºC) and with
an applied voltage of up to 100V, stability of linearity is ± 0.01 ppm/24 hours and ± 0.1 ppm/30 days
Power coefficient of linearity
±0.2 ppm of input/W max at dial settings of 1.1 to 0.1; ±0.2 (10S)2 ppm of input/W max at dial
settings (S) of 0.1 to 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 on 1.0 input terminal, 1100 V on 1.1 input terminal
Thermal voltages
±0.5 μV max
Input resistance
100 kΩ ±0.005% at 1.0 input terminal at 25 °C, 110 kΩ ±0.005% at 1.1 input terminal at 25 °C
Temperature coefficient of input
resistance
±1 ppm per °C max