Agilent Technologies X Series Manual page 593

Default Unit
Initial S/W Revision
Offset
Adjusts the accumulated offset between the periodic timer events and the trigger event. Adjusting the
accumulated offset is different than setting an offset, and requires explanation.
The periodic timer is usually not synchronized with any external events, so the timing of its output
events has no absolute meaning. Since the timing relative to external events (RF signals) is important,
you need to be able to adjust (offset) it. However, you have no direct way to see when the periodic timer
events occur. All that you can see is the trigger timing. When you want to adjust the trigger timing, you
will be changing the internal offset between the periodic timer events and the trigger event. Because the
absolute value of that internal offset is unknown, we will just call that the accumulated offset. Whenever
the Offset parameter is changed, you are changing that accumulated offset. You can reset the displayed
offset using Reset Offset Display. Changing the display does not change the value of the accumulated
offset, and you can still make additional changes to accumulated offset.
To avoid ambiguity, we define that an increase in the "offset" parameter, either from the knob or the
SCPI adjust command, serves to delay the timing of the trigger event.
Key Path
Remote Command
Example
Notes
Notes
Dependencies
s
Prior to A.02.00
Trigger, Periodic Timer
:TRIGger[:SEQuence]:FRAMe:OFFSet <time>
:TRIGger[:SEQuence]:FRAMe:OFFSet?
TRIG:FRAM:OFFS 1.2 ms
The front panel interface (for example, the knob), and this command, adjust
the accumulated offset, which is shown on the active function display.
However, the actual amount sent to the hardware each time the offset is
updated is the delta value, that is, the current accumulated offset value minus
the previous accumulated offset value. Note that the accumulated offset value
is essentially arbitrary; it represents the accumulated offset from the last time
the offset was zeroed (with the Reset Offset Display key).
Note that this command does not change the period of the trigger waveform.
Note also that Offset is used only when the sync source is set to OFF,
otherwise delay is used, see section
An increase in the "offset" parameter, either from the knob or the SCPI adjust
command, serves to delay the timing of the trigger event.
When the SCPI command is sent the value shown on the key (and the Active
Function, if this happens to be the active function) is updated with the new
value. However, the actual amount sent to the hardware is the delta value, that
is, the current accumulated offset value minus the previous accumulated offset
value.
The SCPI query simply returns the value currently showing on the key.
The invalid data indicator turns on when the offset is changed, until the next
sweep/measurement completes.
"Trig Delay" on page 597.
Trigger
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