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Delayed Triggering
TDS 620A, 640A, & 644A User Manual
NOTE
When you set the Vertical SCALE smaller than 200 mV, the oscillo-
scope reduces the Set to TTL or Set to ECL trigger levels below
standard TTL and ECL levels. That happens because the trigger
level range is fixed at
center. At 100 mV (the
next smaller setting after 200 mV) the trigger range is
V which
is smaller than the typical TTL (+1.4 V) or ECL (–1.3 V) level.
Set to 50% fixes the delayed trigger level to 50% of the peak-to-peak
value of the delayed trigger source signal.
See
Triggering
, on page 2-13.
See
Triggering
, on page 3-142.
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