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The Tektronix Type 191 Constant Amplitude Signal Generator is a sine wave source | The '''Tektronix Type 191 Constant Amplitude Signal Generator''' is a sine wave source | ||
[[introduced in 1966]]. It covers frequencies from 350 kHz to 100 MHz in seven bands. The output | [[introduced in 1966]]. It covers frequencies from 350 kHz to 100 MHz in seven bands. The output | ||
amplitude can be adjusted in calibrated steps from 5 mV to 5 V in three ranges. The oscillator | amplitude can be adjusted in calibrated steps from 5 mV to 5 V in three ranges. The oscillator | ||
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Image:191.png|Schematic | Image:191.png|Schematic | ||
</gallery> | </gallery> | ||
[[Category:Signal generators]] | |||
[[Category:Introduced in 1966]] | |||
Revision as of 02:03, 19 August 2014
The Tektronix Type 191 Constant Amplitude Signal Generator is a sine wave source introduced in 1966. It covers frequencies from 350 kHz to 100 MHz in seven bands. The output amplitude can be adjusted in calibrated steps from 5 mV to 5 V in three ranges. The oscillator is an Colpitts oscillator using a 7119 tube. A peak-to-peak detector made with two GaAs diodes measures the swing of the oscillator and produces a DC feedback signal that controls a series voltage regulator that supplies power to the oscillator. The calibration procedure in the manual makes use of a 661 to accurately view the output waveform.
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Front view
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Top internal view
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Bottom internal view
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Left internal view
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Right internal view
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Rear view
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Schematic
