Fluke 720A Kelvin-Varley Divider

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Product ID : 3998
Brand : Fluke
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Product overview: 720A Kelvin-Varley Divider

A primary standard for ratio measurements


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

Key Features

  • High-resolution primary standard for ratio measurements
  • 0.1 ppm of input absolute linearity, 0.1 ppm resolution, seven decades
  • Temperature coefficient of linearity of 0.1 ppm/ºC
  • Built-in self-calibration bridge

Specifications: 720A Kelvin-Varley Divider

General specifications
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
Size 14 cm H x 48.2 cm W x 33 cm D, rack mounted (5.5 in H x 19 in W x 13 in D)
Weight 8.15 kg (18 lb)

Manuals + Resources: 720A Kelvin-Varley Divider

Data sheet (1)

Manuals + Resources: 720A Kelvin-Varley Divider

Data sheet (1)

Product overview: 720A Kelvin-Varley Divider

A primary standard for ratio measurements


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

Key Features

  • High-resolution primary standard for ratio measurements
  • 0.1 ppm of input absolute linearity, 0.1 ppm resolution, seven decades
  • Temperature coefficient of linearity of 0.1 ppm/ºC
  • Built-in self-calibration bridge

Specifications: 720A Kelvin-Varley Divider

General specifications
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
Size 14 cm H x 48.2 cm W x 33 cm D, rack mounted (5.5 in H x 19 in W x 13 in D)
Weight 8.15 kg (18 lb)

Manuals + Resources: 720A Kelvin-Varley Divider

Data sheet (1)

Manuals + Resources: 720A Kelvin-Varley Divider

Data sheet (1)

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