Tektronix 26A2 Differential Amplifier

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Tektronix Catalog CostLow BidHigh Bidaverage
$550 (1973) ...
$12.52 (+$12.69 ship) 12/26/07 #310009378812 psstudios (2 bids $9.99 start) (from working environment-untested)
$20.50 (+$13.44 ship) 1/2/08 #310010570438 psstudios (4 bids $9.99 start) (from working environment-untested)

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    26A2 Differential Amplifier
    100 to 100,000 gain
    50,000:1 CMRR
    DC to 1 MHz Bandwidth at all Gain settings

    The 26A2 is a DC-coupled differential amplifier designed for use in the 2600-Series modular instrument system. Excellent common-mode rejection, high gain, and selectable high- and low-frequency -3 dB points, make the 26A2 suitable for low-frequency, low-level applications.

    There are many factors which affect the usability of high-gain, wideband differential amplifiers. Noise (if excessive) can make the high-gain positions unusable. Since noise is related to bandwidth, noise can be greatly reduced with a HF -3DB POINT selector when the applicaion allows. DC drift can also hinder measurements causing the trace to move offscreen rapidly. A small signal DC component, perhaps a few millivolts, would also place a DC-coupled display offscreen at 10 μV/div. There are three ways to reject this DC voltage: (1) AC coupling the input if the signal frequency is high enough to be unaffected (2 Hz, LOWER -3dB POINT). (2) AC coupling with the LF -3 DB POINT selector which allows lower bandwidth selection down to 0.1 Hz. (3) DC OFFSET which supplies an internal DC voltage to offset, or reject, the DC signal component.

    A guard signal derived from the common-mode signal within the amplifier is available on the front panel for driving cable shields. ± 15 volts DC is also available to permit use of special active probes, transducer adapters, etc.