2 MEASurement Commands
78 U8480 Series Programming Guide
FETCh[1]? Query
The FETCh? query calculates the measurement and sends the result to the PC.
The result format is set by FORMat[:READing][:DATA]. Refer to Chapter 5,
“FORMat Subsystem,” on page 125 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 the data is invalid, the FETCh? query is not completed until all data becomes
valid. The exceptions to this are, if the U8480 Series is in the idle state and the
data is invalid, or the U8480 Series 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.
When TRIGger[1]:SOURce is EXT and a new acquisition has been initiated (using
the INITiate command for example), FETCh? waits until the trigger takes place
before executing. If trigger conditions are not satisfied — when the trigger level
differs greatly from the signal level for example — this can give the impression
that the U8480 Series has hung.
To unlock the U8480 Series and adjust trigger settings, a Device Clear command
must be performed.
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