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Trigger
TV
Pressing this key, when it is not selected, selects the TV input signal as the trigger. A new
sweep/measurement will start synchronized with the next occurrence of the synchronizing pulse of the
selected TV line number.
Pressing this key, when it is already selected, opens a menu of TV Trigger setup functions. The default
active function in this menu is the TV line number on which you want to trigger.
The Frame and Field options enable you to determine how the fields of the TV picture signal will be
affected by the trigger system. One complete TV image consists of one frame of 525 or 625 horizontal
lines depending on the TV standard being used. Each frame is composed of two fields of interlacing
lines, each consisting of 262 1/2 lines (or 312 1/2 lines). The fields are called Field One and Field Two.
Field One is viewed as having 263 lines (or 313 lines) and Field Two is viewed as having 262 lines (or
312 lines).
For the 525 line NTSC video standard, we refer to TV lines as follows (these are the Field Modes):
Entire Frame, lines 1 to 525
Field One, lines 1 to 263
Field Two, lines 1 to 262 (note that this really refers to "actual" lines 264 to 525)
For the 625 line PAL and SECAM video standards, we refer to TV lines as follows:
Entire Frame, lines 1 to 625
Field One, lines 1 to 313
Remote Command: :TRIGger[:SEQuence]:AIQMag:BANDwidth <freq>
:TRIGger[:SEQuence]:AIQMag:BANDwidth?
Example: :TRIG:AIQM:BAND 8 MHz
Notes: The combined sample rate for the main and auxiliary receivers cannot exceed
100 MSa/sec. The bandwidth available to the Trigger BW is limited to what is
available after the main receiver's bandwidth (Info BW, sometimes pre-FFT
BW) is set. Because of this limitation, the Max is not always achievable.
The combination of Trigger Center Freq and Trigger BW is also limited:
Trigger CF + 1/2 Trigger BW < Max
Trigger CF – 1/2 Trigger BW > Min
Preset: Bandwidth option dependent:
No Opt: 10 MHz
Opt B25: 25 MHz
Opt S40: 40 MHz
State Saved: Saved in instrument state
Range: 10 Hz to Maximum
Initial S/W Revision: Prior to A.02.00