HP 54620A, User'S And Service Manual

Page: 107 / 243

Connections for External Trigger using an Oscilloscope Probe
The external trigger input can have a logic threshold setting independent of
channels 0-15. You may use a divider probe if needed to adjust the input
signal to a range compatible with the analyzer. However, you need to ensure
that you do not reduce the signal swing to less than the 500 mV required
swing about the threshold voltage. For example, if the input signal is 3 V, and
you use a 10:1 divider probe, the input swing will be 300 mV, which is
insufficient.
The waveform present at the external trigger input cannot be displayed.
Measure time
Save/Recall
Entry
LOGIC ANALYZER
54620A
16 CHANNEL 500 MSa/s
STORAGE
TRIGGER HORIZONTAL
CHANNEL
INPUTS
L i n e
Time/Div
Select
Trigger out
Delay
Position
Ext trigger in
GND
GND
GND
GND
Figure 30
Making Analyzer Measurements
Extending trigger capabilities
106