191: Difference between revisions

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Image:Tek_191_right.jpg|Right internal view
Image:Tek_191_right.jpg|Right internal view
Image:Tek_191_rear.jpg|Rear view
Image:Tek_191_rear.jpg|Rear view
Image:191.png|Schematic
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Revision as of 09:33, 2 May 2010

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.