7A22: Difference between revisions

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* [[Media:TB-9-6625-2132-35.pdf | TB 9-6625-2132-35 Calibration Procedure for AM-6881/U (7A13) and AM-6786/U (7A22)]] (PDF, 2M)
* [[Media:TB-9-6625-2132-35.pdf | TB 9-6625-2132-35 Calibration Procedure for AM-6881/U (7A13) and AM-6786/U (7A22)]] (PDF, 2M)
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The '''Textronix 7A22''' is a single channel differential vertical amplifier for the [[7000-series scopes|7000 series mainframes]], produced from about 1969 to 1991.  Specifications and controls are similar to the [[26A2]] and the [[3A9]] from the 560 series but without current probe input or front panel signal output.
The '''Tektronix 7A22''' is a single channel differential vertical amplifier for the [[7000-series scopes|7000 series mainframes]], produced from about 1969 to 1991.  Specifications and controls are similar to the [[26A2]] and the [[3A9]] from the 560 series but without current probe input or front panel signal output.


Remarkably, the 7A22's input sensitivity reaches down to 10 μV/Div.  Bandwidth is 1 MHz, the upper 3 dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz.  A separate control optionally supplies an internal DC voltage to offset the DC signal component.  Even in the most sensitive ranges (10 μV/Div to 10 mV/Div), common-mode voltage can be ±10 V.  Input resistance is 1 MΩ, but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the disadvantage of disabling the 20 mV/div and higher ranges.
Remarkably, the 7A22's input sensitivity reaches down to 10 μV/Div.  Bandwidth is 1 MHz, the upper 3 dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz.  A separate control optionally supplies an internal DC voltage to offset the DC signal component.  Even in the most sensitive ranges (10 μV/Div to 10 mV/Div), common-mode voltage can be ±10 V.  Input resistance is 1 MΩ, but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the disadvantage of disabling the 20 mV/div and higher ranges.