Fluke 125 Fluke 125 Users Manual - Page 41

Isolated Triggering, TRIG:A, FREE RUN, ON TRIG., Isolated Triggering

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j Accept all trigger selections and return to normal measurement. Note Setting the automatic triggering to >1Hz will slow down the auto range. TRIG:A appears in gray text on bottom of the screen when no trigger is found. Note Gray text in a menu or button bar indicates that the function is disabled or the status is not valid. FREE RUN: the test tool automatically updates the trace even if there are no triggers. ON TRIG.: the screen is updated only when valid triggers occur. 2 Scope/Meter Mode Triggering on a Waveform Isolated Triggering Use the optically isolated trigger probe (ITP120, optional) to trigger on an external source, and to isolate the test tool from a trigger waveform. See Figure 2-16. To choose the isolated trigger probe, select 'EXT' in point e of the previous example. Trigger level is fixed and is TTL compatible. Figure 2-16. Isolated Triggering 2-19

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Scope/Meter Mode
Triggering on a Waveform
2
2-19
Accept all trigger selections and
return to normal measurement.
Note
Setting the automatic triggering to >1Hz will slow
down the auto range.
TRIG:A
appears in gray text on bottom of the screen when
no trigger is found.
Note
Gray text in a menu or button bar indicates that
the function is disabled or the status is not valid.
FREE RUN:
the test tool automatically updates the trace
even if there are no triggers.
ON TRIG.:
the screen is updated only when valid
triggers occur.
Isolated Triggering
Use the optically isolated trigger probe (ITP120, optional)
to trigger on an external source, and to isolate the test tool
from a trigger waveform. See Figure 2-16.
To choose the isolated trigger probe, select ‘EXT’ in point
of the previous example. Trigger level is fixed and is
TTL compatible.
Figure 2-16. Isolated Triggering