281
The Tektronix 281 TDR Pulser is an accessory that plugs into the probe power jack on 1S1, 3S1, and 4S1 plug-ins. It has two GR-874 connectors. One connector is intended to be connected to the input of a sampling oscilloscope. The 281 periodically produces a pulse that is launched down a cable. The returning reflection is allowed to pass into the oscilloscope for measurement. The pulse is specified to be 460mV, with a rise time of 750 ps or less, with a 5 microsecond pulse width.
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Entry in 1968 catalog