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The {{Title|General Radio 980 Series Decade Capacitance Units}} were introduced in {{Catalog O}} and remained available through {{Catalog S}}. | The {{Title|General Radio 980 Series Decade Capacitance Units}} were introduced in {{Catalog O}} and remained available through {{Catalog S}}. | ||
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. | 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, e.g. the values for 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. The switch mechanism without capacitors was also available separately for service or experimental use, as Type [[980-P1]]. | |||
==Specifications== | ==Specifications== | ||
* '''Two Terminal Zero Capacitance:''' 11 pF | * '''Two-Terminal Zero Capacitance:''' 11 pF | ||
* '''Three Terminal Zero Capacitance:''' 5 pF | * '''Three-Terminal Zero Capacitance:''' 5 pF | ||
* '''Terminals:''' flexible leads | * '''Terminals:''' flexible leads | ||
* '''Maximum Voltage:''' 500 V | * '''Maximum Voltage:''' 500 V | ||
==Links== | ==Links== | ||
* [[Media:GR Exp 980 1419-A 07_1956.pdf|Experiment July 1956 describing Type 980]] | |||
* [[Media:GR_Exp_980_Series_1457-K_10_1957.pdf|Experimenter October 1957 describing Type 980]] | * [[Media:GR_Exp_980_Series_1457-K_10_1957.pdf|Experimenter October 1957 describing Type 980]] | ||
* '''Notes for table below:''' | * '''Notes for table below:''' | ||
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==Photos== | ==Photos== | ||
Latest revision as of 14:03, 20 May 2024
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, e.g. the values for 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. The switch mechanism without capacitors was also available separately for service or experimental use, as Type 980-P1.
Specifications
- Two-Terminal Zero Capacitance: 11 pF
- Three-Terminal Zero Capacitance: 5 pF
- Terminals: flexible leads
- Maximum Voltage: 500 V
Links
- Notes for table below:
- Dissipation Factor is at 1 kHz
- Frequency Limit is for the maximum voltage
| 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
