980

The General Radio 980 Series Decade Capacitance Units were introduced in Catalog O (1956) and remained available through Catalog S (1965).

The Type 980 Series decade capacitance units are comprised of four capacitors mounted on a 980-P1 switch. The capacitor values are selected in a "1-2-2-5" combination. For example the values used with Type 980-A are 0.1, 0.2, 0.2, and 0.5 μF. The eleven position switch maintains a combination of the four standard capacitors in parallel to produce the decade of capacitance values. Capacitors using different dielectric materials are used in the series, polystyrene, silvered mica, paper, and moulded silvered mica. The Type 980 decade units are components of Types 1419-A, 1419-B , 1419-K , and 1419-M Decade Capacitors. Also available separately, the switch mechanism without capacitors for service or experimental use under the Type 980-P1.

Specifications

• Two Terminal Zero Capacitance: 11 pF
• Three Terminal Zero Capacitance: 5 pF
• Terminals: flexible leads
• Maximum Voltage: 500 V

Links

• Experiment July 1956 describing Type 980
• Experimenter October 1957 describing Type 980

• Notes for table below:
• Dissipation Factor is at 1 kHz
• Frequency Limit is for the maximum voltage

Type 980 Series of Decade Capacitor Units

Type	Capacitance Total	Capacitance Per Step	Dissipation Factor	Accuracy 2 Terminal	Accuracy 3 Terminal	Dielectric	Frequency Limit	Code
980-A	1 μF	0.1 μF	<0.0002	±1%	±1%	Polystyrene	10 kHz	AVAST
980-B	0.1 μF	0.01 μF	<0.0002	±1%	±1%	Polystyrene	100 kHz	AVERT
980-C	0.01 μF	0.001 μF	<0.0002	±1%	±1.5%	Polystyrene	1 MHz	AVOID
980-D	0.001 μF	0.0001 μF	<0.0002	±(1% + 2 pF)	±1% -(2% + 4 pF)	Polystyrene	10 MHz	ALIEN
980-F	1 μF	0.1 μF	<0.0003	±0.5%	±0.5%	Silvered Mica	10 kHz	ACUTE
980-G	0.1 μF	0.01 μF	<0.0003	±0.5%	±0.5%	Silvered Mica	100 kHz	AVOWD
980-H	0.01 μF	0.001 μF	<0.0003	±0.5%	±1%	Silvered Mica	1 MHz	AWAIT
980-J	0.001 μF	0.0001 μF	<0.0006	±(0.5% + 2 μF)	+0,(±2% + 8 μF)	Silvered Mica	10 MHz	ADIEU
980-L	1 μF	0.1 μF	<0.005	±1.5%	±1.5%	Paper	2 kHz	ADAGE
980-M	0.1 μF	0.01 μF	<0.001	±1%	±1%	Silver Mica (Moulded)	100 kHz	ADDER
980-N	0.01 μF	0.001 μF	<0.001	±1%	±1%	Silver Mica (Moulded)	1 MHz	ADDLE

Photos

• 

  Type 980-H Decade Unit

• 

  Type 980-A Decade Unit