The Pulse Head is an accessory to the CG 551AP Programmable Calibration Generator. It connects to themain output of the CG 551AP and is programmed andstimulated by signals from fht? CG 551AP. This accessorygenerates 1 V square waves with a well defined leadingedge. This edge is used to vrrify and calibrate transientvsponse in wide-band oscilloscopes.