HP 16501A LOGIC, 16500C manual Start the external instrument or system, See Also

Intermodule Measurements

To start a group run of modules from an external trigger source

To start a group run of modules from an external trigger source

1Connect the arm signal from the external instrument or system to the PORT IN BNC connector on the rear panel of the HP 16500 frame.

2Select the Intermodule menu.

3Set up the group run specification.

4Select 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.

bSelect the field under PORT IN Edge to change from Rising to Falling edge and vice-versa for the rear-panel input signal.

cSelect Done to leave the PORT IN/OUT Setup menu.

5Select 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.

6Start 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.”

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