1409

The General Radio General Radio 1409 Standard Capacitor was introduced in Catalog O (1956) and remained available through Catalog 1978.

The 1409 Standard Capacitors are fixed mica capacitors 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.

Specifications

• 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 the limiting frequencies tabulated below

Links

• Experimenter July 1957 describing Type 1409 Series

Type 1409 Series of Standard Capacitors

Type	Capacitance	Frequency Limit for Max Volts	Series Inductance	Code Number
1409-F	0.001 μF	4.7 MHz	0.050 μH	1409-9702
1409-G	0.002 μF	2.7 MHz	0.050 μH	1409-9707
1409-K	0.005 μF	1.3 MHz	0.050 μH	1409-9711
1409-L	0.01 μF	750 kHz	0.050 μH	1409-9712
1409-M	0.02 μF	430 kHz	0.050 μH	1409-9713
1409-R	0.05 μF	210 kHz	0.055 μH	1409-9718
1409-T	0.1 μF	120 kHz	0.055 μH	1409-9720
1409-U	0.2 μF	70 kHz	0.055 μH	1409-9721
#1409-X	0.5 μF	35 kHz	0.055 μH	1409-9724
##1409-Y	1 μF	17 kHz	0.070 μH	1409-9725

• # Mounted in medium case.
• ## Mounted in large case.

Photos

• 

  Change in capacitance as a function of frequency for typical Type 1409 capacitors.

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  Dissipation factor as a function of frequency.