HP 16534A User Reference page 138

Installation and Operator's Service
Self Cal menu calibrations
Install the Master/Expander Trigger Cables on the ECL EXT TRIG IN
b
and OUT connectors on the rear panel of each HP 16533/34A card.
Starting with the top-most HP 16533/34A card, connect the ECL EXT
TRIG OUT to the ECL TRIG IN of the card immediately below. Repeat
for all cards in the module.
Reapply power to the HP 16500 mainframe.
c
When power-up is complete, Touch System, then touch Scope. Touch
d
Channel, then touch Calibration.
Calibrate the Time Null of the Self Cal.
6
a
Connect two BNC 50-Ω, 9-inch cables to the BNC tee adapter. Once
you touch Start, the instrument will prompt you to connect the cables
to the appropriate locations on the rear panel of the instrument.
Touch the Procedure field, then touch Time Null from the pop-up
b
menu.
Touch the Start field and follow the instructions on the display.
c
After completion of the Time Null calibration, remove the cables from
d
the instrument.
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