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[[File:Tek_191_front.jpg|350px|thumb|right|Tektronix 191]]
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]].   
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.


{{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. 
==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.
==Manuals==
* [http://w140.com/mmm/tek-191.pdf Tektronix 191 Manual (PDF)]
* [http://w140.com/mmm/tek-191.pdf Tektronix 191 Manual (PDF)]
* [[Media:TB-9-6625-2176-35.pdf|TB-9-6625-2176-35 - 191 calibration]]


==Pictures==
<gallery>
<gallery>
Image:Tek_191_front.jpg|Front view
File:Tek_191_front.jpg|Front view
Image:Tek_191_top.jpg|Top internal view
File:Tek_191_top.jpg|Top internal view
Image:Tek_191_bottom.jpg|Bottom internal view
File:Tek_191_bottom.jpg|Bottom internal view
Image:Tek_191_left.jpg|Left internal view
File:Tek_191_left.jpg|Left internal view
Image:Tek_191_right.jpg|Right internal view
File:Tek_191_right.jpg|Right internal view
Image:Tek_191_rear.jpg|Rear view
File:Tek_191_rear.jpg|Rear view
Image:191.png|Schematic
File:191.png|Schematic
</gallery>
</gallery>


[[Category:Signal generators]]
[[Category:Signal generators]]
[[Category:Introduced in 1966]]
[[Category:Introduced in 1966]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/17750"

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