Filter
Top Products
Triggering
3-46
CSA8000B & TDS8000B User Manual
recognize when the next trigger conditions are satisfied and cannot generate the
next trigger event. When instrument is triggering on undesired events
(Figure 3--14, top waveform), you adjust holdoff to obtain stable triggering.
Indicatestrigger points
Trigger level
At thelonger holdofftime for the topwaveform, triggeringoccurs at valid,but undesired,trigger
events.With ashorter holdoffset for thebottom waveform, triggers all occuron the first pulsein the
burst,which results in astable display.
Holdoff Holdoff Holdoff
Trigger level
Holdoff Holdoff Holdoff Holdoff
Figure 3- 14: Holdoff adjustment can prevent false triggers
Usable Holdoff. The holdoff time the instrument can use varies within limits. The
maximum holdoff the instrument can achieve is the 50 ms specified in Specifica-
tion on page Table A--3 on page A--3.
The minimum holdoff used depends on hardware constraints, which do not
change, and certain control settings, which you can control:
H The instrument hardware constrains the minimum usable holdoff time to the
greater of the trigger-to-end-of-record time or 5 s.
H The trigger-to-end-of-record time (EORT) is the time from the trigger event
to the last sample in the waveform record and is calculated as:
EORT = Horiz. Position + (1 -- 0.01 x Horiz. Ref.) x Time/Div x 10
divisions) + Channel Deskew