Reference
Alternating trigger uses the curr ent trigger s ettings to trigger on all
active channels; there is not a separate trigger setup for each channel.
Therefore, the trigger settings m ust be able to trigger on all active
signals in order to produce a stable triggered display. If one o r mo re
of the sou rce signals do not meet the trig ger settings, the oscilloscope
either waits for that source channel to trigger (Normal t rig ger mode) or
autotriggers (Auto trigger mode).
Due to image persistence, all alternating trigger active channels may
appear to be synchronized. However, t his does not mean that the
displayed signals are syn chro nized. Also, altern atin g trigger does not
use EXT, E XT/10, or Line signals as trigger sources.
Holdoff. You can use holdoff to help stabilize the display of complex
waveforms. After you pu sh the Mode & Holdoff screen button, use the
general purpose knob t
o set the holdoff time as an absolute value or as
a percent of the record duration.
Holdoff begins when
the oscilloscope recognizes a trigger event and
disables the trigger system until acquisition is complete. The trigger
system remains disabled during th e hold off time.
NOTE.
For best results, c hoose Normal trigger mode when using long
holdo
ff settings (10 ms or greater).
116 TDS3000C Series Oscilloscope User Manual
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