Reference
Bottom Side Description
High N
Low N
Sets the runt signal high threshold a nd low
threshold voltage levels to value N,usingthe
general purpose knob.
Set to TTL Sets runt signal threshold voltage levels to
2.0 V (high threshold) a nd 0.8 V (low threshold).
Thresholds
Set to ECL Sets runt signal th reshold voltage levels
to -1.1 V (high threshold) and -1.5 V (low
threshold).
Mode &
Holdoff
The table on Edge triggering includes a
description of this menu item. (See page 114.)
Key Points
Trigger When. The source runt pulse width must be ≥5nsinorderfor
the oscillo scope to detect th e pulse.
Slew Rate Trigger
Slew-rate triggering triggers the oscilloscope when a signal's slew rate
(rise or f all time) is less than, greater than, equal to, or not equal to a
specified slew rate. This trigger is useful for troubleshoo ting digital bu s
transceivers, transmission lines, and op-amp circuits.
128 TDS3000C Series Oscilloscope User Manual
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