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.
Capacitance |
Selected values between 50 pF to 1 μF available |
Within a tolerance of ± 100 to ± 500 ppm depending on value, at 1 kHz | |
Dissipation factor | Around 0·00005 to 0·0005 depending on value at 1 kHz |
Frequency dependence | ~ 90ppm for each factor of 10 increase in measurement frequency |
Drift | ± 0·05 ppm/day typically |
Stability | (Short term) ± 0·01 ppm/hour |
Max | Working voltage 30 V rms |
Warm-up time | 1 hour (allow 48 hours to stabilise before use) |
Operating ambient temperature | 15 °C to 24 °C |
Relative humidity | 20% to 60% non-condensing |
Storage temperature range | 5 °C to 70 °C |
Power requirements | 12 V DC ± 0·5 V |
Power consumption | 15 watts max. during initial warm-up, 2 watts after 1 hour, dependent on ambient temperature |
Packaging | 93mm high, 123mm wide, 125mm depth, plus 50 mm height of BPOs |
Weight | 1.4 kg |
Warranty | 1 year return to base |
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.
Don’t see what you are looking for? Our diverse skill set enables us to provide bespoke solutions. Please contact us to discuss your requirements.
Our research and measurement solutions support innovation and product development. We work with companies to deliver business advantage and commercial success.
Contact our Customer Services team on +44 20 8943 7070