Standard capacitors

Highly stable standards

We have developed highly stable four terminal-pair capacitance standards of compact design. Their stability derives from using a ceramic dielectric and by keeping the standards at constant temperature using a two-stage oven.

Two BNC connectors are attached to the built-in platinum resistance thermometer (PRT) to monitor the internal temperature of the capacitor. Accurate capacitance measurement can be made via four terminal-pair coaxial BPO (MUSA) connectors. Each capacitor is housed in a metal box and requires only a simple 12 Volt DC supply to operate the temperature controller. A feature of this capacitor is that the value does increase by about 90 parts per million (ppm) with each factor of ten increase in the measurement frequency.

Features

• Selected capacitance values in the range 50 pF to 1 μF are available
• High stability
• Capacitance value close to nominal
• Small dissipation factor
• Frequency dependence is ~90 ppm for each factor of 10 increase in measurement frequency
• Compact design with standard four terminal-pair BPO (MUSA) connectors
• Built-in two-stage oven controller with an independent 100 Ω PRT sensor as standard
• 1 year warranty
• Calibration certificate available

Specifications

The best measurement capability, expressed as an expanded uncertainty (k = 2) is 70 ppm of nominal value, which applies to a wide range of instruments and test conditions.

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