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1212-A: Difference between revisions
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Type | {{GR Product | ||
|model=1212-A | |||
|codes=ALACK | |||
|class=detectors amplifiers | |||
|summary=Unit Null Detector | |||
|image=GR 1212-A Close_Up.jpg | |||
|caption=General Radio 1212-A Unit Null Detector | |||
|series=1212 | |||
|introduced=1954 | |||
|discontinued=1968 | |||
|designers= | |||
|manuals= | |||
* [[Media:GR 1212A Unit Null Detector 1212-0100-H 01_1964.pdf|General Radio 1212-A Unit Null Detector Manual 1212-0100-H 1964]] | |||
{{Catalog History}} | |||
}} | |||
The {{Title|General Radio 1212-A Unit Null Detector}} was introduced in {{Catalog N}} and remained available through {{Catalog T}}. | |||
The Type 1212-A Unit Null Detector a wide band logarithmic amplifier used to indicate a balance during bridge measurements. It uses three stages of amplification that are designed to reduce gain as the signal increases. The output of the last stage is available at the rear panel and a built in vacuum tube voltmeter displays relative signal strength with a panel meter. The 1212-A null detector is recommended for use with Type [[716-C]] Capacitance Bridge, Type [[1661-A]] Vacuum Tube Bridge, Type [[916-AL]] R-F Bridge, Type [[716-CS1]] Capacitance Bridge, and the Type [[1606-A]] R-F Bridge at frequencies below 5 MHz. Frequency coverage can be extended to 60 Mc and sensitivity improved by the use of the Type [[1212-P3]] RF Mixer ahead of the null detector. The 1212-A requires an external unit power supply, the Types [[1203-B]] or [[1201-B]] unit power supplies are recommended. There are two accessory filters available, Type [[1212-P1]] High Pass Filter and [[1212-P2]] One Megahertz Filter. | |||
==Specifications== | ==Specifications== | ||
* '''Frequency Response:''' 50 Hz to 5 MHz | |||
* '''Sensitivity:''' 40 μV at 1 kHz sensitivity for 1% deflection | |||
* '''Hum and Noise Level:''' Hum 20 μV; broad-band noise 30 μV | |||
==Links== | ==Links== | ||
* [[Media:GR Exp 1212-A 1212-P1 10_1953.pdf|Experimenter October 1953 describing Type 1212-A]] | |||
* [[Media:GR Exp 1212-P2 01_1956.pdf|Experimenter January 1956 describing Type 1212-P2]] | |||
==Photos== | ==Photos== | ||
<gallery> | <gallery> | ||
GR 1212-A Front A.jpg | |||
GR 1212-A Front.jpg | |||
GR 1212-A Front w_Power Supply.jpg | |||
GR 1212-A Left Side.jpg | |||
GR 1212-A Rear.jpg | |||
GR 1212-A Right Side.jpg | |||
GR 1212-A Inside Top.jpg | |||
GR 1212-A Inside Rear.jpg | |||
GR 1212-A Inside Rear A.jpg | |||
GR 1212-A Inside Bottom.jpg | |||
GR 1212-A Inside Bottom A.jpg | |||
</gallery> | </gallery> | ||
[[Category:Detectors Amplifiers]] | [[Category:Detectors Amplifiers]] | ||