1232-A: Difference between revisions
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|model=1232-A | |model=1232-A | ||
|codes=VOCAL,1232-9701 | |codes=VOCAL,1232-9701 | ||
|class=detectors | |class=amplifiers and detectors | ||
|summary=Tuned amplifier and null detector | |summary=Tuned amplifier and null detector | ||
|image=GR 1232-A Front.jpg | |image=GR 1232-A Front.jpg | ||
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The 1232-A is a solid-state, battery-operated tuned amplifier and null detector. Its tuned frequency range covers 20 to 20 kHz in 5 bands, plus a flat response setting. | The 1232-A is a solid-state, battery-operated tuned amplifier and null detector. Its tuned frequency range covers 20 to 20 kHz in 5 bands, plus a flat response setting. | ||
As a null detector, the 1232-A is part of the GR [[1660-A]] | As a null detector, the 1232-A is part of the GR [[1240-A|1240-A Bridge Oscillator-Detector]], the [[1660-A|1660-A Inductance Measurement System]], and the [[1620-A|1620-A Capacitance Measurement System]]. Battery operation is provided by nine M72 cells (now obsolete). | ||
The instrument shown in the photos below has been converted to a rechargeable battery pack. | The instrument shown in the photos below has been converted to a rechargeable battery pack. | ||
(Instructions for this conversion are covered in a document below.) | (Instructions for this conversion are covered in a document below.) | ||
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GR 1232-A Right Side.jpg | GR 1232-A Right Side.jpg | ||
GR 1232-A Rear.jpg | GR 1232-A Rear.jpg | ||
GR 1240-A Close-Up.jpg | Late model, white front-panel 1232-A as part of a 1240-A | |||
</gallery> | </gallery> | ||
[[Category:Detectors Amplifiers]] | [[Category:Detectors Amplifiers]] | ||
Latest revision as of 15:25, 12 September 2024
The General Radio 1232-A Tuned Amplifier and Null Detector was introduced in Catalog Q (1961) and remained available through Catalog 1978.
The 1232-A is a solid-state, battery-operated tuned amplifier and null detector. Its tuned frequency range covers 20 to 20 kHz in 5 bands, plus a flat response setting.
As a null detector, the 1232-A is part of the GR 1240-A Bridge Oscillator-Detector, the 1660-A Inductance Measurement System, and the 1620-A Capacitance Measurement System. Battery operation is provided by nine M72 cells (now obsolete).
The instrument shown in the photos below has been converted to a rechargeable battery pack. (Instructions for this conversion are covered in a document below.)
Specifications
- Frequency Response:
- Tunable Filters: 20 Hz to 20 kHz in 3 ranges; 5% bandwidth; 2nd harmonic at least 34 dB down from peak, 3rd at least 40 dB down
- 50 kHz and 100 kHz Filters: 2nd harmonic 44 and 53 dB down, respectively
- Flat Response: ±3 dB from 20 Hz to 100 kHz
- Input Impedance: Approximately 50 kΩ at maximum gain, varies inversely with gain to 1 MΩ at minimum gain
- Gain: 120 dB on the tunable ranges; 100 dB, flat range; 106 dB at 50 kHz; 100 dB at l00 kHz position
Links
- Experimenter July 1961 describing Type 1232-A
- Experimenter February 1967 describing 1232-P2 Preamplifier
- GR 1232-A Battery Conversion
Photos
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Late model, white front-panel 1232-A as part of a 1240-A
