HP 54620A User's And Service Manual page 106

Figure 29 shows the first case, where you might trigger the analyzer by using
the trigger output of an emulator. Figure 30 shows the second case, using an
oscilloscope probe to route the signal to the external trigger input.
Figure 29
Connections for External Trigger from an Emulator
Vectra
Making Analyzer Measurements
Extending trigger capabilities
54620A
STORAGE
LOGIC ANALYZER
16 CHANNEL 500 MSa/s
Measure time
Save/Recall Entry
HORIZONTAL TRIGGER
Delay
CHANNEL
Time/Div
Select
INPUTS
Position
Trigger out Ext trigger in
L i n e
105