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{{Instrument Sidebar | |||
introduced | |manufacturer=Tektronix | ||
|model=191 | |||
|class=Signal generator | |||
|series= | |||
|summary=Constant Amplitude Signal Generator | |||
|image=Tek 191 front.jpg | |||
|caption=Tektronix 191 front | |||
|introduced=1966 | |||
|discontinued=(?) | |||
|designers= | |||
|manuals= | |||
* [[Media:070-0522-00.pdf|Tektronix 191 Manual]] | |||
* [[Media:TB-9-6625-2176-35.pdf|TB-9-6625-2176-35 - 191 calibration]] | |||
* [[Media:Tek 191 fcp june 1966.pdf|Tektronix 191 Factory Calibration Procedure, June 1966]] | |||
}} | |||
The '''Tektronix Type 191 Constant Amplitude Signal Generator''' is a sine wave source [[introduced in 1966]]. | |||
{{MissingSpecs}} | |||
The 191 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. | |||
==Links== | |||
{{Documents|Link=191}} | |||
==Internals== | |||
The oscillator is a 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. | |||
==Pictures== | |||
<gallery> | <gallery> | ||
Tek_191_front.jpg|Front view | |||
Tek_191_top.jpg|Top internal view | |||
Tek_191_bottom.jpg|Bottom internal view | |||
Tek_191_left.jpg|Left internal view | |||
Tek_191_right.jpg|Right internal view | |||
Tek_191_rear.jpg|Rear view | |||
191.png|Schematic | |||
</gallery> | </gallery> | ||
[[Category:Signal generators]] | |||
[[Category:GR874]] |