GenRad 1423A
Precision Decade Capacitor

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Manufacturer: GenRad
Model: 1423A

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Product Overview

GenRad 1423A

The GenRad 1423 decade capacitor is a versatile tool for calibration laboratories and production-line testing. With it a bridge can be standardized to an accuracy exceeded only by that of the highest quality, individually certified laboratory standards such as the GR 1404 Reference Standard Capacitors. Used with a limit bridge, such as the GR 1689 Digibridge, the 1423 facilities fast and accurate production line measurements of arbitrary capacitance values with minimum setup time.

Any value of capacitance from 100 pF to 1.111 ;.F, in steps of 100 pF, can be set on the four decades and will be known to an accuracy of 0.05%. The terminal capacitance values are set precisely to the nominal value and can be readjusted later at calibration intervals, if necessary, without disturbance of the main capacitors.

The GR 1423-A decade capacitor consists of four decades of high-quality silvered-mica capacitors similar to those used in the GR1409 Standard Capacitors. The capacitors and associated switches are mounted in an insulated metal compartment, which in turn is mounted in a complete metal cabinet. This double-shielded construction ensures that capacitance at the terminals is the same for either the three-terminal or the two-terminal method of connection (except for a constant difference of about one picofarad). This external capacitance can be included in the two terminal calibration by the adjustment of a single trimmer.

Specifications of the GenRad 1423-A include:

Nominal Value: 100 pF to 1.111 µF in steps of 100 pF.
Accuracy: ±(0.05% + 0.05pF) at 1 kHz, calibrated in the three terminal connection. Two-terminal connection (capacitor inserted into Type 777-Q3 Adaptor) adds about 1.3 pF.
Stability: ±(0.01% + 0.05pF) per year.
Dissipation Factor: Not greater than 0.001, 0.0005, and 0.0003 for capacitances of 100 to 1000 pF, 1100 to 2000 pF, and 2100 pF to 1.1110 µF, respectively.
Temperature Coefficient of Capacitance: Approx 20 ppm per degree between 10°C and 50°C.
Maximum Voltage: 500 V peak, up to 10 kHz.