Commands Listed in Alphabetical Order
Examples
TRIGGER:HIFRE
QOFF
disables the high-frequency triggering.
TRIGGER:HIFREQ? might return TRIGGER:HIF REQ 1, indicating that the
high-frequen
cy triggering is enabled.
NOTE. A query always returns a 0 or 1.
TRIGger:HOLDoff
This command sets or queries the trigger holdoff, which is the time the instrument
waits befo
re arming the trigger system to accept triggers. Holdoff can help
achieve stable triggering. Sending this command is equivalent to entering a value
in the Holdoff control in the Trigger Setup dialog box.
Two primary factors determine what the minimum acceptable holdoff value may
be at any given time.
Hardware restrictions. There is a minimum time required from the
acceptance of one trigger event until the n ext due to both trigger re-arm
time and maximum sample rate requirements. These requirements result in
an absolute minimum holdoff setting of 5 µs (given appropriate instrument
settings).
Time of last sample. The instrument must use a holdoff setting that is at
least greater than the time from the trigger event to the farthest sample in any
wave
form acquisition. For example, if you have the time/div set to 1 µs/div
with the horizontal timebase position set to minimum, for instance about
18 ns, the operational (that is, actual) holdoff must be greater than: 19 ns + 1
µs/div*10 div = 10.018 µs (the h ardwar e restrictions cause the instrument to
increase this value).
The following are many of the parameters, which affect the determination by the
instrument of the minimum actual holdoff:
Horizontal scale (that is, time/div)
Horizontal position
Horizontal timebas e mode
Horizontal FrameScan settings (when FrameScan is ena ble d)
User (Channel) deskew
The query form of this command returns the actual holdoff value in use by the
instrument.
Group
Trigger
DSA/CSA/TDS8X00/B Series Programmer Manual 2-331
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