Keysight E6640A, Руководство пользователя и программиста по приложениям измерений

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11 Occupied Bandwidth Measurement
Sweep/Control
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 <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 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
"Trig Delay" on
page 357 .
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.
Preset 0 s
State Saved Saved in instrument state
Min –10.000 s
Max 10.000 s
Default Unit S
Initial S/W Revision Prior to A.02.00
Offset Adjust (Remote Command Only)
This remote command does not work at all like the related front panel keys. This command lets you
advance the phase of the frame trigger by the amount you specify.
It does not change the period of the trigger waveform. If the command is sent multiple times, it advances
the phase of the frame trigger an additional amount each time it is sent. Negative numbers are permitted.
1586 W-CDMA & HSPA Measurement Applications Reference