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The Tektronix 2A61 is a differential amplifier plug-in for [[560-series scopes]]. | |||
The deflection factor ranges from 10uV/div to 20mV/div. | |||
There are switch-selectable high-frequency and low-frequency cutoffs. | |||
At 20mV/div, the minimum low-frequency cutoff is 0.06Hz and | |||
the maximum high-frequency cutoff is 0.3MHz. | |||
To implement the low-frequency cutoff, the 2A61 has a large electrolytic capactitor | |||
(13,000uF or 20,000uF depending on serial number) in the emitter frequency compensation | |||
network of the second differential amplifier stage. | |||
The 2A61 manual's calibration instructions recommend using the Heathkit IG-72 | |||
Audio Generator. | |||
* [http://bama.edebris.com/download/tek/2a61/2a61.djvu Tektronix 2A61 Manual (PDF)] | * [http://bama.edebris.com/download/tek/2a61/2a61.djvu Tektronix 2A61 Manual (PDF)] | ||