MDO3000 Programmer Manual.pdf - 第947页
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. Examp…
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
Commands Listed in Alphabetical Order
Group
Trigger
Syntax
TRIGger:A:VIDeo:STANdard {NTSc|PAL|SECAM|BILevelcustom|
TRILevelcustom| HD480P60|HD576P50|HD720P30|HD720P50
|HD720P60|HD875I60|HD1080P24|HD1080SF24|HD1080I50
|HD1080I60|HD1080P25|HD1080P30|HD1080P50|HD1080P60}
TRIGger:A:VIDeo:STANdard?
Related Commands
TRIGger:A:VIDeo:CUSTom{:FORMat|:TYPe}, TRIGger:A:VIDeo:CUSTom:
LINEPeriod, TRIGger:A:VIDeo:CUSTom:SYNCInterval
Arguments
NTSc sets the oscilloscope to trigger on video signals that meet the NTSC
525/60/2:1 standard (a line rate of 525 lines per frame and a field rate of 60 Hz).
PAL sets the oscilloscope to trigger on video signals that meet the NTSC
625/50/2:1 standard (a line rate of 625 lines per frame and a field rate of 50 Hz).
SECAM sets the oscilloscope to trigger on video signals that meet the SECAM
standard.
BILevelcustom sets the oscilloscope to trigger on video horizontal scan rate
parameters defined by the TRIGger:A:VIDeo:CUSTom{:FORMat|:TYPe},
TRIGger:A:VIDeo:CUSTom:LINEPeriod and TRIGger:A:VIDeo:CUSTom:
SYNCInterval commands. (Requires installation of a DPO4VID application
module for 4000 series models.)
TRILevelcustom sets the oscilloscope to trigger on video horizontal scan rate
parameters defined by the TRIGger:A:VIDeo:CUSTom{:FORMat|:TYPe},
TRIGger:A:VIDeo:CUSTom:LINEPeriod command. (Requires installation of a
DPO4VID application module for 4000 series models.)
HD480P60|HD576P50|HD720P30|HD720P50|HD720P60|HD875I60
|HD1080P24|HD1080SF24|HD1080I50|HD1080I60|HD1080P25|HD1080P3 0
|HD1080P50|HD1080P60
set the oscilloscope to trigger on an HDTV video
signal that meets standards defined in the following table. (Requires installation
of a DPO4VID application module for 4000 series models.)
Table 2-57: Available HDTV formats
HDTV format Description
480p60
525 lines (480 active), 640 or 704 x 480
pixel, progressive, 60 fps
576p50
EDTV with 625 lines (576 active), 1024 x 576
pixel, progressive, 50 fps
720p30
750 lines (720 active), 1280 x 720 pixel,
progressive, 30 fps
2-918 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual