134 6000 Series Oscilloscope User’s Guide
4 Triggering the Oscilloscope
•HF Reject adds a 50 kHz low-pass filter in the trigger path
to remove high frequency components from the trigger
waveform. You can use HF Reject to remove
high- freq uenc y noi se, s uch a s AM o r FM b road cast sta tion s
or noise from fast system clocks, from the trigger path.
To s et H ol do ff
1Press the Mode/Coupling key.
2Turn the Entry knob to increase or decrease the trigger
holdoff time shown in the Holdoff softkey.
Holdoff sets the amount of time that the oscilloscope waits
before re-arming the trigger circuitry. Use Holdoff to stabilize
the display of complex waveforms.
To get a stable trigger on the pulse burst shown below, set the
holdoff time to be >200 ns but <600 ns.
By setting the Holdoff, you can synchronize triggers. The
oscilloscope will trigger on one edge of the waveform, and
ignore further edges until the holdoff time expires. The
oscilloscope will then re-arm the trigger circuit to search for the
next edge trigger. This allows the oscilloscope to trigger on a
repeating pattern in a waveform.
Scope triggers here
Holdoff
200ns 600ns