1232-A: Difference between revisions

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{{GR Product
{{GR Product
|model=1232-A
|model=1232-A
|class=detectors amplifiers
|codes=VOCAL,1232-9701
|summary=tuned amplifier and null detector  
|class=amplifiers and detectors
|summary=Tuned amplifier and null detector  
|image=GR 1232-A Front.jpg
|image=GR 1232-A Front.jpg
|caption=General Radio 1232-A Tuned Amplifier and Null Detector
|caption=General Radio 1232-A Tuned Amplifier and Null Detector
Line 8: Line 9:
|introduced=1961
|introduced=1961
|discontinued=1978+
|discontinued=1978+
|designers=Albert E. Sanderson; Henry P. Hall
|designers=Albert E. Sanderson, Henry P. Hall
|manuals=
|manuals=
* [[Media:GR 1232A Tuned Amp and Detector 1232-0100-C 08_1963.pdf|General Radio 1232-A Tuned Amplifier and Null Detector 1232-0100-C 08_1963]]
* [[Media:GR 1232A Tuned Amp and Detector 1232-0100-C 08_1963.pdf|General Radio 1232-A Tuned Amplifier and Null Detector 1232-0100-C 08_1963]]
* [[Media:GR 1232-A Detector_Amp 1232-0100-00 12_1988.pdf|General Radio 1232-A Tuned Amplifier and Null Detector 1232-0100-00 12_1988]]
* [[Media:GR 1232-A Detector_Amp 1232-0100-00 12_1988.pdf|General Radio 1232-A Tuned Amplifier and Null Detector 1232-0100-00 12_1988]]
{{Catalog History}}
}}
}}
The '''General Radio 1232-A Tuned Amplifier and Null Detector''' was introduced in 1961 Catalog Q and remained available through Catalog 1978.  
The {{Title|General Radio 1232-A Tuned Amplifier and Null Detector}} was introduced in {{Catalog Q}} and remained available through {{Catalog 1978}}.  


The Type 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 its part of the GR [[1660-A]] Inductance and [[1620-A]] Capacitance Measurement Systems. Battery operation is provided by 9 now obsolete M72 cells.  The instrument used for this article has been converted to a rechargeable battery pack.  The instructions for this conversion are covered in a document below.
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|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.
(Instructions for this conversion are covered in a document below.)


==Specifications==
==Specifications==


* '''Frequency Response:'''
* '''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.
* 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.
* 50 kHz and 100 kHz Filters: 2nd harmonic 44 and 53 dB down, respectively
* Flat Response: ±3db 20 cps to 100 kc.
* 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.
* '''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.
* '''Gain:''' 120 dB on the tunable ranges; 100 dB, flat range; 106 dB at 50 kHz; 100 dB at l00 kHz position


==Links==
==Links==


* [[Media:GR Exp 1232-A 07_1961.pdf|Experimenter describing Type 1232-A July 1961]]
* [[Media:GR Exp 1232-A 07_1961.pdf|Experimenter July 1961 describing Type 1232-A]]
* [[Media:GR Exp 1232-P2 Preamplifier 02_1967.pdf|Experimenter describing 1232-P2 Preamplifier February 1967]]
* [[Media:GR Exp 1232-P2 Preamplifier 02_1967.pdf|Experimenter February 1967 describing 1232-P2 Preamplifier]]
* [[Media:GR 1232-A Detector_Amp Battery Conversion.pdf| GR 1232-A Battery Conversion]]
* [[Media:GR 1232-A Detector_Amp Battery Conversion.pdf| GR 1232-A Battery Conversion]]


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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

General Radio 1232-A
Tuned amplifier and null detector
General Radio 1232-A Tuned Amplifier and Null Detector

Available from 1961 to 1978+

Manuals
Catalog History
 Document Year Page
Catalog Q 1961 60
Catalog R 1963 79
Catalog S 1965 104
Catalog T 1968 115
Catalog U 1970 134
Catalog73 1973 162
Catalog78 1978 48
(All manuals in PDF format unless noted otherwise)

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

Photos

  • Late model, white front-panel 1232-A as part of a 1240-A

    Late model, white front-panel 1232-A as part of a 1240-A

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