1409-U
The General Radio General Radio 1409-U Standard Capacitor was introduced in Catalog O (1956) and remained available through Catalog U (1970).
The 1409-U is a fixed mica capacitor of very high stability for use as two or three-terminal capacitance standards in the laboratory. The capacitor is installed in an aluminum case along with Silica gel desiccant then sealed with hi-temp potting wax. A well located on the right side of the case for the insertion of a dial-type thermometer. Three jack-top binding posts are provided on the top of the case and removable plugs on the bottom, for convenient parallel connection without error. Each capacitor is supplied with a certificate of calibration giving two and three terminal measured capacitance. The Type 1409-U capacitor is mounted in the small case.
See 1409 to view all the capacitors in the series.
Specifications
- Capacitance: 0.2 μF
- Series Inductance: 0.055 μH
- Adjustment Accuracy: within ±0.05%
- Stability: Capacitance change is less than 0.01% per year
- Temperature Coefficient: capacitance; +35 ± 10 ppm per degree between 10 °C and 70 °C
- Dissipation Factor: Less than 0.0003 at 1 kHz and 23 °C (see curves). Measured dissipation factor at 1 kHz is stated in the certificate to an accuracy of ±0.00005
- Leakage Resistance: 5000 ohm-farads or 100 GΩ, whichever is the lesser
- Maximum Voltage: 500 V peak below 70 kHz
Links
Photos
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Change in capacitance as a function of frequency for typical Type 1409 capacitors.
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Dissipation factor as a function of frequency.
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Technical Drawing.
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Thermometer Access
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