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To start a group run of modules from an external
trigger source
1 Connect the arm signal from the external instrument or system to the
PORT IN BNC connector on the rear panel of the HP 16500 frame.
2 Select the Intermodule menu.
3 Set up the group run specification.
4 Select the PORT IN/OUT field.
a Select the field under PORT IN Level, then select the level that
matches the external signal that will be applied to the PORT IN BNC
on the HP 16500C rear panel.
The choices are TTL, ECL, and User. The latter allows you to specify a
voltage from −4.00 V to +5.00 V using an onscreen keypad.
b Select the field under PORT IN Edge to change from Rising to Falling
edge and vice-versa for the rear-panel input signal.
c Select Done to leave the PORT IN/OUT Setup menu.
5 Select the Group Run field in the upper right hand corner.
The modules attached directly to the Group Run Armed from PORT IN field
wait for a signal from the PORT IN field.
6
Start the external instrument or system.
When the external instrument sends the proper signal to the PORT IN BNC,
the internal modules attached directly to the Group Run Armed from PORT
IN field are armed and begin searching for their respective trigger conditions.
Modules are armed by modules above them, either an individual module or the
field named Group Run Armed from PORT IN. That is, in the intermodule display,
an arrow pointing to a module to be armed originates in the module providing
the arm signal. See the figure “Oscilloscope Arms State Analyzer in Group Run”
on page 2-5. When armed, a module begins searching for the input that will
satisfy its trigger specification. To obtain a specification of “trigger on the arm
signal,” specify a trigger that equates to “trigger on anything.”
See Also “To set up a group run of modules within the HP 16500C.”
Intermodule Measurements
To start a group run of modules from an external trigger source
2–6