Fluke PM-3380B, PM-3390B, PM-3370B, PM-3394B, PM-3384B user manual Restrictions

COMMAND REFERENCE 4 - 55

Description:

The FETCh? queries are part of the measurement instruction set. They return the signal characteristic from the last initiated measurement, as specified by the <measure function> part of the query header.

An initiate command must precede a FETCh? query. The initiate command may be given either explicitly as INITiate[:IMMediate] command, or explicitly by a READ? or MEASure? query. When the acquisition is still in progress, the response to a FETCh? query does not become available until the acquisition is completed. In such a case, no error is reported. Execution of INITiate[:IMMediate] and FETCh? is equivalent to the execution of the READ? query.

A FETCh? query may also return a signal characteristic from a valid acquisition result that is stored in a TRACe memory element.

Example: Send → FETCh:AC? (@M2_3) Fetches AC- RMS of the M2_3 trace.

A FETCh? query allows the same parameter sets as the corresponding MEASure? and CONFigure instructions. Their use distinguishes from these instructions in that they only serve to specify the desired result from a FETCh? query. They don’t affect the instrument settings. They may also be sent for reasons of compatibility with a preceding CONFigure or READ? instruction.

When the <measure_function> part of the FETCh? query header is defaulted, the characteristic as specified by the last executed FETCh?, READ?, or MEASure query is returned. When such a query is not executed since the last power on cycle, the measure function VOLTage:DC is assumed by the oscilloscope.

The default :VOLTage node specifies that the requested characteristic relates to the voltage component of the signal. For example, the rise time or the frequency of the voltage.

Restrictions:

(1)A FETCh? query may be executed only when the oscilloscope is in the digital mode (INStrument:SELect DIGital). The digital mode is selected after

*RST. Executing this query when the instrument is in the analog mode generates execution error -221,"Settings conflict; Digital mode required".

(2)A FETCh? query may not operate on a TRACe memory element that has been modified since the last executed INItiate[:IMMediate], READ?, or MEASure? command. Otherwise execution error -230,"Data corrupt or stale" is generated.