Agilent Technologies Signal Analyzer N9030a User Manual
Page 1217
6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Sweep/Control
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
Trigger, Periodic Timer
Remote Command
:TRIGger[:SEQuence]:FRAMe:OFFSet
: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 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.
Notes
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.
Dependencies
The invalid data indicator turns on when the offset is changed, until the next
sweep/measurement completes.
Couplings
The same offset is used in the Gate Source selection of the period timer.
Remote Language Compatibility Measurement Application Reference
1217