1231-P5: Difference between revisions
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{{GR Product | {{GR Product | ||
|model=1231-P5 | |model=1231-P5 | ||
|codes=ALDER,ADOBE | |||
|class=detectors amplifiers | |class=detectors amplifiers | ||
|summary=Adjustable Filter | |summary=Adjustable Filter | ||
| Line 15: | Line 16: | ||
The {{Title|General Radio 1231-P5 Adjustable Filter}} was introduced in {{Catalog M}} and remained available through {{Catalog P}}. | The {{Title|General Radio 1231-P5 Adjustable Filter}} was introduced in {{Catalog M}} and remained available through {{Catalog P}}. | ||
The Type 1231-P5 is designed as an accessory filter for the Type [[1231-B]] Amplifier and Null Detector. Its purpose | The Type 1231-P5 is designed as an accessory filter for the Type [[1231-B]] Amplifier and Null Detector. | ||
is increase selectivity, reduce noise and harmonics | Its purpose is to increase selectivity, reduce noise and harmonics. | ||
The internal filters are parallel-resonant circuits, consisting of toroidal inductors and fixed capacitors for the 11 frequencies. | |||
Four additional switch positions are provided for selecting toroid inductors L1 thru L4 only. | |||
A pair of terminals for an external capacitor can be used for tuning the filter to any frequency from 20 Hz to 100 kHz. | |||
'''CAUTION:''' The Type 1231-P5 filter should not be subjected to any DC current. | |||
==Specifications== | ==Specifications== | ||
Latest revision as of 22:43, 30 April 2024
The General Radio 1231-P5 Adjustable Filter was introduced in Catalog M (1951) and remained available through Catalog P (1959).
The Type 1231-P5 is designed as an accessory filter for the Type 1231-B Amplifier and Null Detector. Its purpose is to increase selectivity, reduce noise and harmonics.
The internal filters are parallel-resonant circuits, consisting of toroidal inductors and fixed capacitors for the 11 frequencies. Four additional switch positions are provided for selecting toroid inductors L1 thru L4 only. A pair of terminals for an external capacitor can be used for tuning the filter to any frequency from 20 Hz to 100 kHz.
CAUTION: The Type 1231-P5 filter should not be subjected to any DC current.
Specifications
- Filter Frequencies: 11 settings; 50, 100, 200, 500 Hz; 1, 2, 5, 10, 20, 50, 100 kHz
- Frequency Calibration: Within ±2%
- Selectivity: Better than 30 dB against the second harmonic
