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Delayed Triggering
TDS 620A, 640A & 644A User Manual
3Ć25
NOTE
When you set the Vertical SCALE smaller than 200ĂmV, the oscilloĆ
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 ±12 divisions from the center. At 100ĂmV (the
next smaller setting after 200ĂmV) the trigger range is ±1.2ĂV which
is smaller than the typical TTL (+1.4ĂV) or ECL (-1.3ĂV) level.
H Set to 50% fixes the delayed trigger level to 50% of the peakĆtoĆpeak
value of the delayed trigger source signal.
See Triggering, on page 2Ć13.
See Triggering, on page 3Ć132.
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