RIGOL DS1000B - Manual (Page 57)

Command Systems RIGOL
Programming Guide for DS1000B Series 2-45
Example:
:TRIG:ALT:VIDEO:MODE ALLLINES,SOURB Set the sync mode as all lines.
:TRIG:ALT:VIDEO:MODE? SOURB
Return ALL LINES.
13. :TRIGger:ALTernation:VIDEO:LINE
Command Format:
:TRIGger:ALTernation:VIDEO:LINE [,]
:TRIGger:ALTernation:VIDEO:LINE? []
Function:
The command sets the number of sync specified line. In NTSC standard, the
range is 1~525; in PAL/SECAN standard, the range is 1~625.
The may be SOURceA or SOURceB, and the source A and B are
varying with the current alternation channel.
Returned Format:
The query returns the number of specified line.
Example:
:TRIG:ALT:VIDEO:LINE 100, SOURB
Set the specified line number as 100.
:TRIG:ALT:VIDEO:LINE? SOURB Return 100.
14. :TRIGger:ALTernation:COUPling
Command Format:
:TRIGger:ALTernation:COUPling {DC|AC|LF}[,]
:TRIGger:ALTernation:COUPling? []
Function:
The command sets the coupling mode.
DC: Allow all signals pass;
AC: Reject DC signals and attenuate AC signals below 10Hz.
LF: Reject DC and attenuate low frequency signals below 8kHz.
The may be SOURceA or SOURceB, and the source A and B are
varying with the current alternation channel.