1142-A

From GRWiki
Jump to navigation Jump to search
General Radio 1142-A
Frequency meter and discriminator
General Radio 1142-A Frequency Meter and Discriminator

Available from 1961 to 1968

Manuals
Catalog History
 Document Year Page
Catalog Q 1961 83
Catalog R 1963 101
Catalog S 1965 127
Catalog T 1968 179
(All manuals in PDF format unless noted otherwise)

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

Links

Photos