1142-A: Difference between revisions
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{{GR Product | |||
The | |model=1142-A | ||
|codes=MAGIC,1142-9701 | |||
|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 ]] | |||
{{Catalog History}} | |||
}} | |||
The {{Title|General Radio 1142-A Frequency Meter and Discriminator}} was introduced in {{Catalog Q}} and remained available through {{Catalog T}}. | |||
The 1142-A is an analog, direct-reading frequency meter with the addition of an interpolation feature. With the interpolation control set to ''Direct'', the frequency can be read directly from the panel meter with ±1% accuracy. To obtain better resolution and accuracy, engage the interpolation setting (see manual). The 1142-A has three outputs for connecting chart recorders (Direct, Interpolation, and FM). | |||
==Specifications== | ==Specifications== | ||
* '''Frequency:''' 3 Hz to 1.5 MHz in 5 decade ranges | * '''Frequency:''' 3 Hz to 1.5 MHz in 5 decade ranges | ||
* '''Maximum Voltage:''' | * '''Maximum Voltage:''' 300 V<sub>p-p</sub> up to 150 kHz, 70 V<sub>p-p</sub> above 150 kHz | ||
* '''Sensitivity | * '''Sensitivity:''' RMS 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). | ||
* '''Impedance:''' 100 kΩ dropping to minimum of 5 kΩ above 500 kHz | |||
* '''Accuracy:''' 0.2% of full scale for all but the extremes of 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> | ||
Latest revision as of 18:52, 16 April 2024
The General Radio 1142-A Frequency Meter and Discriminator was introduced in Catalog Q (1961) and remained available through Catalog T (1968).
The 1142-A is an analog, direct-reading frequency meter with the addition of an interpolation feature. With the interpolation control set to Direct, the frequency can be read directly from the panel meter with ±1% accuracy. To obtain better resolution and accuracy, engage the interpolation setting (see 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 Vp-p up to 150 kHz, 70 Vp-p above 150 kHz
- Sensitivity: RMS 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).
- Impedance: 100 kΩ dropping to minimum of 5 kΩ above 500 kHz
- Accuracy: 0.2% of full scale for all but the extremes of frequency coverage
