8 Trigger
8.1 Trigger
8.1.9 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.
Remote Command
:TRIGger[:SEQuence]:FRAMe:OFFSet <time>
:TRIGger[:SEQuence]:FRAMe:OFFSet?
Example
:TRIG:FRAM:OFFS 1.2 ms
Notes The front panel interface (for example, the knob), and this command, adjust the accumulated offset,
which is shown on the control
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 "Trigger Delay" on page
2343
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 control 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
Dependencies The invalid data indicator turns on when the offset is changed, until the next sweep/measurement
completes
Only appears when Periodic Timer is selected as the Trigger or Gate Source
Short Range Comms & IoT Mode User's &Programmer's Reference 2352
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