1A7: Difference between revisions
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the FET-equipped Type 1A7A, which also doubled the bandwidth | the FET-equipped Type 1A7A, which also doubled the bandwidth | ||
and the common-mode rejection. Type 1A7A remained available | and the common-mode rejection. Type 1A7A remained available | ||
until the end of the | until the end of the [[500-series scopes|500-series]] line after 1974. | ||
* [http://w140.com/mmm/tek-1a7.pdf Tektronix 1A7 Manual (PDF)] | * [http://w140.com/mmm/tek-1a7.pdf Tektronix 1A7 Manual (PDF)] | ||
Revision as of 18:17, 25 March 2013
Type 1A7 is a high-sensitivity differential plug-in for 500-series scopes. It senses down to 10uV/div, either AC or DC-coupled. It's possible to apply up to +/-300mV offset to the reading while maintaining sensitivity. Upper and lower cutoff frequency is selectable on the front panel. Maximum bandwidth is 500kHz, and common-mode rejection is 50,000 to 1.
Type 1A7's front end is a matched quad of 7586 nuvistors, with two in parallel - to reduce noise - on each input. These tubes are in temperature-equalizing housings, and mounted on a rubber-isolated subchassis. The "coarse" balance adjustment controls the relative heater voltages on the 7586's.
Type 1A7 was introduced in 1966. In 1968 it was superseded by the FET-equipped Type 1A7A, which also doubled the bandwidth and the common-mode rejection. Type 1A7A remained available until the end of the 500-series line after 1974.
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