MEASurement Commands
2
Keysight N8262A Programming Guide
145
FETCh[1]|2|3|4 Queries
The
FETCh?
queries set the specified window’s measurement function. This can be
set to either single channel, difference or ratio measurements, with relative mode
either off or on. They then recalculate the measurement and place the result on
the bus. The format of the result is set by
FORM[:READ][:DATA]
. Refer to
, “FORMat Subsystem,” on page 275 for further information.
The query returns a measurement result when it is valid. The measurement result
is invalid under the following conditions:
– When
*RST
is executed.
– Whenever a measurement is initiated.
– When any
SENSe
parameter, such as frequency, is changed.
If data is invalid, the
FETCh?
query is not completed until all data becomes valid.
The exceptions to this are, if the power meter is in the idle state and the data is
invalid, or the power meter has been reconfigured as defined above and no new
measurement has been initiated. In such cases, the
FETCh?
routine generates the
error –230, “Data corrupt or stale” and no result is returned. A common cause for
this error is receiving a
FETCh?
after a
*RST
. If the expected value and resolution
parameters are not the same as those that were used to collect the data, error
–221, “Settings conflict” occurs.
NOTE
When
TRIG:SOUR is INT1, INT2
or
EXT
and a new acquisition has been
initiated (using the
INIT
command for example),
FETCH?
waits until the trigger
takes place before executing. If triger conditions are not satisfied - when the
trigger level differs greatly from the signal level for example - this can give the
impression that the power meter has hung.
Содержание N8262A
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