2A61: Difference between revisions
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Revision as of 13:36, 3 August 2013
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.
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