CG551AP
The Tektronix CG551AP is a programmable calibration generator plug-in for the TM500 system.
It is a TM500 version of the CG5001 and requires a TM506 Mod JB, TM515 Mod UB or RTM506 Mod JB enclosure.
It uses external heads, the 015-0310-01 Comparator Head and the 015-0311-01 Programmable Pulse Head.