Reference
Bottom Side Description
Level Use to set the trigger level with the general
purpose knob.
Set to TTL Sets the trigger level to +1.4 V for TTL logic.
Set to ECL Sets the trigger level to -1.3 V for ECL logic
(V
ee
=-5.2V).
Level
Set to 50% Sets the trigger level to the 50% amplitude
level of the signal.
Auto (untriggered
roll)
Enables free-running and roll-mo de
acquisitions.
Normal Triggers only on v alid trigger events.
Holdoff (time) Sets h oldoff to a specifictime.
Holdoff (% of
record)
Sets holdoff to a percent of the record duration.
Mode &
Holdoff
Set to Min Sets holdoff to the minimum value.
Key Points
Displaying the Trigger Source. You do not have to display a channel to
use it as a trigger source.
Normal and Auto Mode . U se N ormal trigger mode when you w an t to
trigger only on a v a lid event. Use Auto trigger mode when you want the
acquisition to occur, even when there is not a valid tri gger event. Also
choose Auto when you want a rolling waveform, with no trigger, at the
slower time base settings. (See page 87, Roll Mode Display.)
External Trigger. The trigger level range for the EXT settin g is -0.8 V to
+0.8 V. The t ri gger level rang e for th e EXT/10 setting is -8 V to +8 V.
For best external trigger performance, apply a square-wave signal with
amplitude greater than the specified minimum level range and with
well-defined transitions.
Alternating Trigger. Alternating trigger sequentially uses each active
channel as a trigger source, from the low est-numbered active channel to
the highest-numbered active channel. Alternating trigger is available
in all trigger menus except for logic triggers.
TDS3000C Series O scilloscope User Manual 115
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