The GenRad 1403 Standard Air Capacitors are stable, three-terminal standards in decimal values from 0.001 pF to 1000 pF. For measurement at 100 pF and below, a three terminal connection increases the accuracy by eliminating the uncertainty in the measurement introduced by the capacitances between the capacitor terminals and ground.
The type 1403 Standard Air Capacitors are stable, three-terminal standards in decimal values from 0.001 to 1000 pF.
Their terminals are arranged to plug directly into the UNKNOWN terminals of the Type 1620 Capacitance Bridge or equivalent such as AH2500A Ultra Precision Capacitance Bridge.
The capacitance change is less than 0.01% at frequencies to 2 MHz for 1 pF and 200 kHz for 1000 pF standard making the standard ideal for verifying LCR meters and bridges at frequencies other than 1 kHz.
Dielectric losses are extremely low as there is no solid dielectric in the direct-capacitance field.
All have shielded terminals, both of which are connected to the case.
The paper The Measurement and Uncertainty of Air Dielectric Capacitors from 1 kHz to 10 MHz provides extremely useful information on the change in capacitance vs barometric pressure for the 1403 Series Air Capacitors. (Click on View Conference on left side of page to see presentation)
GenRad 1403 Series High Frequency Standard Capacitor Basic Specifications
Calibration: A certificate of calibration is supplied with each unit giving the measured capacitance at 1 kHz and at a specified temperature. The measured value is the direct capacitance between shielded terminals when the capacitor has at least one lead completely shielded and its case connected to a guard point.
The calibrated capacitance value is obtained by direct measurement using an AH2700A Capacitance Bridge or comparison, to a precision better than ±(0.01% + 0.00001 pF), with standards whose calibrated values are known to an accuracy < 10 ppm, and are periodically calibrated traceable to the SI through a national metrology institute (NIST, NRC, etc).
Stability: Capacitance change is less than 0.05% per year.
Temperature Coefficient of Direct Capacitance: Typically 20 to 40 ppm per degree between 20° and 70°C. The larger coefficients apply to the smaller capacitance values
Terminals: GR874 Coaxial Connectors, which provide complete shielding of the leads
Two bnc-f connectors for 1403-1pF-BNC
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