Fluke Biomedical 190M - Manual (Page 74)

190M Series Medical ScopeMeter
Users Manual
64
Triggering on External Waveforms
(Model 190M-2)
Use external triggering when you want to display
waveforms on inputs A and B while triggering on a third
signal. You can choose external triggering with automatic
triggering or with edge triggering.
1 Supply a signal to the red and black 4-mm
banana jack inputs.
In this example you continue from the Trigger on Edges
example. To choose the external signal as trigger source,
continue as follows:
2
TRIGGER
Display the TRIGGER (On Edges)
key labels.
3
F1
Select Ext (external) edge trigger.
Observe that the key labels at the bottom of the screen
have been adapted to allow selection of two different
external trigger levels: 0.12 V and 1.2 V:
4
F3
Select 1.2V under the Ext LEVEL
label.
From this point the trigger level is fixed and is compatible
with logic signals.