1142-A: Difference between revisions
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{{GR Product | |||
|model=1142-A | |||
|class=frequency standards and meters | |||
|summary=frequency meter and discriminator | |||
|image=GR 1142-A Front.jpg | |||
|caption=General Radio 1142-A Frequency Meter and Discriminator | |||
|series= | |||
|introduced=1961 | |||
|discontinued=1968 | |||
|designers= | |||
|manuals= | |||
* [[Media:GR 1142A Frequency Meter & Discriminator.pdf|General Radio 1142-A Frequency Meter and Discriminator 1142-100-E 1969 ]] | |||
}} | |||
The '''General Radio 1142-A''' is an analog frequency meter and discriminator [[introduced in 1961]] Catalog Q and remained available through Catalog T 1968. The 1142-A is a direct reading frequency meter with the addition of a Interpolation feature. With the Interpolation control set to Direct the frequency is read directly from the panel meter ±1% accuracy. To obtain better resolution and accuracy engage the Interpolation setting (See Insturction Manual). The 1142-A has three outputs for connecting chart recorders (Direct, Interpolation, and FM). | The '''General Radio 1142-A''' is an analog frequency meter and discriminator [[introduced in 1961]] Catalog Q and remained available through Catalog T 1968. The 1142-A is a direct reading frequency meter with the addition of a Interpolation feature. With the Interpolation control set to Direct the frequency is read directly from the panel meter ±1% accuracy. To obtain better resolution and accuracy engage the Interpolation setting (See Insturction Manual). The 1142-A has three outputs for connecting chart recorders (Direct, Interpolation, and FM). | ||
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* '''Accuracy:''' Nominal accuracy is 0.2% of full scale for all but the extremes of its frequency coverage. | * '''Accuracy:''' Nominal accuracy is 0.2% of full scale for all but the extremes of its frequency coverage. | ||
==Links== | ==Links== | ||
* [[Media:GRwiki Exp 1142-A 1961-2.pdf|Experimenter describing 1142-A February 1961 ]] | * [[Media:GRwiki Exp 1142-A 1961-2.pdf|Experimenter describing 1142-A February 1961 ]] | ||
==Photos== | ==Photos== | ||
<gallery> | <gallery> | ||
Revision as of 00:41, 29 February 2024
The General Radio 1142-A is an analog frequency meter and discriminator introduced in 1961 Catalog Q and remained available through Catalog T 1968. The 1142-A is a direct reading frequency meter with the addition of a Interpolation feature. With the Interpolation control set to Direct the frequency is read directly from the panel meter ±1% accuracy. To obtain better resolution and accuracy engage the Interpolation setting (See Insturction Manual). The 1142-A has three outputs for connecting chart recorders (Direct, Interpolation, and FM).
Specifications
- Frequency: 3 Hz to 1.5 MHz in 5 decade ranges.
- Maximum Voltage: 300 V peak-to-peak up to 150 kc, 70 V peak-to-peak above 150 kc.
- Sensitivity (rms/Impedance): 20 mv, 20 Hz to 150 kHz; rising to 200 mv at 3 Hz and 1.5 MHz. Up to 5 V for narrow pulses (1 ns). 100 kΩ. impedance dropping to minimum of 5 kΩ. above 500 kHz.
- Accuracy: Nominal accuracy is 0.2% of full scale for all but the extremes of its frequency coverage.
