MDO3000 Programmer Manual.pdf - 第946页

Commands Listed in A lphabetical Order Arguments <NR1> argument is an integer that sets the video line number on which the oscilloscope triggers. The following table lists the valid choices, depe nding o n the acti…

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Commands Listed in Alphabetical Order
TRIGger:A:VI
Deo:HOLDoff:FIELD
This command sets the video trigger holdoff, in terms of video fields, to use for
triggering on video signals.
Conditions
This command requires a DPO4VID application module to use any standard
besides NTSc, PAL, or SECAM, except for MDO3000 models, which do not
require an
application module.
Group
Trigger
Syntax
TRIGger:A:VIDeo:HOLDoff:FIELD <NR3>
TRIGger:A:VIDeo:HOLDoff:FIELD?
Arguments
<NR3> argument is a real number from 0.0 to 8.5 in increments of 0.5. The
argument sets the number of fields that the oscilloscope waits before rearming
the video trigger.
Examples
TRIGGER:A:VIDEO:HOLDOFF:FIELD? might return
:TRIGger:A:VIDeo:HOLdoff:FIELD 5 indicating that the oscilloscope is set
to wait 5 video fields before rearming the trigger.
TRIGGER:A:VIDEO:HOLDOFF:FIELD 4.5 sets the oscilloscope to wait 4.5 video
fields before rearming the trigger.
TRIGger:A:VIDeo:LINE
This command lets you set the specific video line number to be used for triggering
on a video signal. You must also use the TRIGger:A:VIDeo{:SYNC|:FIELD}
command to specify
NUMERic as the video field to use.
Conditions
This command requires a DPO4VID application module to use any standard
besides NTSc, PAL, or SECAM, except for MDO3000 models, which do not
require an application module.
Group
Trigger
Syntax
TRIGger:A:VIDeo:LINE <NR1>
TRIGger:A:VIDeo:LINE?
Related Commands
TRIGger:A:VIDeo{:SYNC|:FIELD}
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-915
Commands Listed in Alphabetical Order
Arguments
<NR1> argument
is an integer that sets the video line number on which the
oscilloscope triggers. The following table lists the valid choices, depending on the
active video standard.
Video Standa
rd
Line Number R
ange
525/NTSC
1–525
625/PAL
1–625
SECAM
1–625
The following HDTV and custom standards become available with installation of
a DPO4VID application module:
Video Sta
ndard
Line Numb
er Range
480 1–525
576 1–625
720 1–750
875 1–875
1080 1–1125
Bilevel Cus tom
4–3000
Trilevel Custom
4–300
0
Examples
TRIGGER:A:VIDEO:LINE 23 sets the oscilloscope to trigger on the line 23.
TRIGGER:A:VIDEO:LINE ? might return :TRIGger:A:VIDeo:LINE 10
indicating that the oscilloscope is set to trigger on line 10.
TRIGger:A:VIDeo:POLarity
This command sets the polar
ity to use for triggering on video signals.
Conditions
This command requires a DPO4VID application modul
e to use any standard
besides NTSc, PAL, or SECAM, except for MDO3000 models, which do not
require an application module.
Group
Trigger
Syntax
TRIGger:A:VIDeo:POLarity {NEGative|POSitive}
TRIGger:A:VIDeo:POLarity?
2-916 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Arguments
POSitive argum
ent sets the oscilloscope to trigger on a positive video sync pulse.
NEGative argument sets the oscilloscope to trigger on a negative video sync
pulse.
Examples
TRIGGER:A:VIDEO:POLARITY NEGATIVE sets the oscilloscope to trigger on a
negative video pulse.
TRIGGER:A:VIDEO:POLARITY? might return :TRIGger:A:VIDeo:POLARITY
POSITIVE
indicating th
at the oscilloscope is set to trigger on a positive video
sync pulse.
TRIGger:A:VIDeo:SOUrce
This command sets the source channel to use for triggering on video signals
(CH1-4).
Conditions
This command requires a DPO4VID application module to use any standard
besides NTSc, PAL, or SECAM, except for MDO3000 models, which do not
require an application module.
Group
Trigger
Syntax
TRIGger:A:VIDeo:SOUrce
{CH1|CH2|CH3|CH4}
TRIGger:A:VIDeo:SOUrce?
Arguments
CH1–CH4 specifies the input channel to use as the A video trigger.
Examples
TRIGGER:A:VIDEO:SOURCE CH1 sets Channel 1 as the source for the video
trigger operation.
TRIGGER:A:VIDEO:SOURCE? might return :TRIGger:A:VIDeo:SOURCE CH2
indicating that the source for the video trigger operation is set to Channel2.
TRIGger:A:VIDeo:STANdard
This command sets the standard to use for triggering on video signals.
Conditions
This command requires a DPO4VID application module to use any standard
besides NTSc, PAL, or SECAM, except for MDO3000 models, which do not
require an application module.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-917