IET Labs KVD-700 Precision Kelvin-Varley Voltage Divider

37.140,00 

•Calibration: Self calibrating; has internal oil bath
•Ratio Range: 0 to 1.0 input for 1.0 terminal;  0 to 1.1 of input for 1.1 terminal
•Resolution: 0.1 ppm with 7 decades
•Absolute Linearity: ±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: 0.1 ppm/30 days under standard laboratory conditions and VIN <100 V.
•Long-Term Linearity Stability: ±1.0 ppm of input/year for S=0.1 to 1.1;±(10S)2/3 ppm of input/year for S=0 to 0.1;Self calibration restores linearity to 0.1 ppm.
•Temperature Coefficient of Linearity: <±0.1 ppm °C for S=0.1 to 1.1;<±0.1 (10S)2/3 ppm/°C for S=0 to 0.1.
•Power Coefficient of Linearity: <±0.2 ppm of input/W for S=1.1 to 0.1;<±0.2 (10S)2 ppm of input/W for S=0.1 to 0.
•Maximum Input Power: 10 W at 1.0 INPUT; 11 W at 1.1 INPUT.
•Maximum Input Voltage: 1000 V at 1.0 input terminal; 1100 V at 1.1 input terminal;
•Input Resistance: 100 kΩ ±50 ppm at 1.0 INPUT; 110 kΩ ±50 ppm at 1.1 INPUT.
•Maximum Output Resistance: 66 kΩ, determined by shorting across the input and measuring the resistance across the output terminals.
•Terminals: High quality low thermal emf gold plated tellurium copper binding posts.

Artikelnummer: 12792 Kategorien: ,

Beschreibung

The IET Labs KVD-700 is a primary calibration grade voltage divider employing the Kelvin-Varley circuit. It is a highly accurate, stable, and linear primary ratio standard suitable for use in many applications requiring known voltage or current ratios. In particular, the KVD-700 Kelvin-Varley Voltage Divider is especially appropriate for use in bridge circuits, providing two legs of a bridge with a very well known ratio.
The KVD-700 has a resolution of 0.1 ppm and an absolute linearity of 0.1 ppm. It has a 1.0 input and a 1.1 input to allow over-ranging. Temperature coefficient of linearity is 0.1 ppm/ºC, and power coefficient of linearity is 0.2 ppm/W.
The KVD-700 Kelvin-Varley Voltage divider incorporates a number of advanced features making for convenience and high performance. These include: self-calibration capability; state of the art nominally „zero tempco bulk metal foil resistors“; Kel-F mounted low-emf tellurium copper binding posts; sealed internal calibration potentiometers; and a convenient operating guide attached to the unit.
The KVD-700 features a built-in Wheatstone bridge self-calibration circuit so that the unit may be calibrated with a minimum of external instruments and without requiring another voltage divider.
The KVD-700 Kelvin-Varley Voltage divider employs precision resistors which have been aged, temperature and power cycled to maximize long-term stability, and matched to minimize temperature and power coefficients effects. The most significant decade is sealed in an oil bath to minimize temperature coefficient effects.
The switches used have gold plated solid silver alloy contacts for long life, minimum contact resistance, and no tarnishing. Gold also allows the use with low level signals. The switches have multiple wiper contacts to provide stable low contact resistance. The main switches are sealed.
High quality gold plated tellurium-copper binding posts serve to minimize the thermal emf effects which would artificially reflect a change in dc resistance measurements. They are mounted to the case on special Kel-F washers to insure low leakage. All other conductors within the instrument, as well as the solder employed, contain no metals or junctions that could contribute to thermal emf problems.
The front panel is clearly labeled showing step size for each decade. Maximum voltage and current limits are indicated as well. The unit may be mounted in a standard 19-inch rack.

•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
•Employees „Zero tempco foil resistors“
•Direct replacement for Fluke 720A
Applications include:
•linearity determination
•the measurement of voltage and resistance
•the calibrationof other dividers, potentiometers or similar devices involving both voltage and current

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IET Labs KVD-700         Precision Kelvin-Varley Voltage Divider

IET Labs KVD-700 Produktdatenblatt

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