IET LABS KVD-700 Precision Kelvin-Varley Voltage Divider
- Primary Calibration grade 100 kΩ Kelivin-Varley Voltage Divider
- Used by National Measurement Institutes around the world
- Built in Wheatstone Bridge allows for a self calibrating circuit
- Employs "Zero tempco foil resistors"
- Direct replacement for Fluke 720A
Specification
KVD-700 Kelvin-Varley Voltage Divider Specifications:
Input Resistance:100 kΩ ±50 ppm at 1.0 INPUT; 110 kW ±50 ppm at 1.1 INPUT.
Ratio Range: 0 to 1.0 of input at 1.0 INPUT; 0 to 1.1 at 1.1 Input.
Resolution: 0.1 ppm with 7 decades.
Absolute Linearity: At 23ºC, at low power; defined relative to zero and full scale outputs, at the output terminals. Quantitatively it is [Vout/ Vin] - S, where S is the dial setting. ±0.1 ppm for S = 0.1 to 1.1. ±0.1 (10S)1/3 ppm for S = 0 to 0. 1.
Short Term Linearity Stability: When maintained under standard laboratory conditions of ± l ºC and applied voltage of <100 V, linearity shall have a stability of ±0.01 ppm per day, and ±0.1 ppm per month.
Long Term Linearity Stability:
± 1.0 ppm/year for S = 0.1 to 1. 1.
± 1.0(10S)2/3 ppm/year for S = 0 to 0.1.
Self-calibration restores linearity to 0.1 ppm.
Temperature Coefficient of Linearity: ±0.1 ppm/ºC for S = 0.1 to 1.1. ±0.1(10S)2/3 ppm/ºC for S = 0 to 0.1.
Power Coefficient of Linearity: ±0.2 ppm/W for S = 0.1 to 1.1. ±0.2(10S)2 ppm/W for S = 0 to 0.1.
Maximum Input Voltage: 1000 V at 1.0 INPUT; 1100 V at 1.1 INPUT.
Maximum Output Current: 11 mA.
Breakdown Voltage: 2500 V to case at sea level; 2000 V to case at 10,000 feet above sea level.
Temperature Coefficient of Input Resistance: ±1.0 ppm/ºC.
Maximum Input Power: 10 W at 1.0 INPUT; 11 W at 1.1 INPUT.
Maximum Output Resistance: 66 kΩ, determined by shorting across the input and measuring the resistance across the output terminals
Thermal Voltages: <0.5 µV at the output terminals.
End Errors: Zero error at OUTPUT LOW terminal <±0.004 ppm of input; Zero error at INPUT LOW terminal <±0.05 ppm of input; Full scale error at OUTPUT HIGH terminal <±0.05 ppm of input.
Terminals: High-quality low-thermal-emf, gold-plated, tellurium-copper binding posts; standard 0.75'' spacing; additional binding posts are connected to the case for shielding. Terminals are insulated from the case by non-moisture absorbing Kel-F spacers.
Operating Conditions: 0ºC to 50ºC; 35% RH to 55% RH; for operating conditions below 15ºC and above 35ºC, linearity must be derated 0.1 ppm/ºC from the temperature of calibration.
Storage Temperature: -34ºC to 70ºC.
Dimensions: 5.25" high 19'' rack panel; Panel: 48.3 cm W x 13.2 cm H (19.0" x 5.20") Behind panel: 42.7 cm W x 12.4 cm H x 31.5 cm D (16.8" x 5.2" x 12.4"); In front of panel 3.8 cm (1.5").
Weight: 8 kg (18 lb)
Voltage Controller