1M1

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The 1M1 is a letter series plug-in used for calibrating a 500-series mainframe. Tektronix made an identical previous unit called TU-7. The 1M1 is used for calibrating the gain and checking the common mode rejection ratio of the mainframe. 500-series mainframes are supposed to have 10 div/volt differential response to signals from the plug-in, and zero response to common-mode signals from the plug-in.