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4-10 Making Measurements
FETCh does not reconfigure the display. For example, if
the display is in the Peak WL mode, sending
:FETCh:ARRay does not configure the display to the List
by WL even though an array of data is returned to the
computer.
A common programming error occurs when the :FETCh
command is used after an *RST command. This gener-
ates error number –230, "Data corrupt or stale". In
this instance, you must send :INIT:IMM after the *RST
command and before the :FETCh command to capture
a new array of measurement data.
:CONFigure command
The CONFigure command changes measurement set-
tings without taking a measurement.
CONFigure can be queried. The query returns the last
configuration setup by the CONFigure command. The
instrument returns a string which is the last instrument
function sent by a CONFigure command or MEASure
query. The returned string is in the short command
form. Use caution when using this query, because if any
instrument settings were changed since the last CON-
Figure command or MEASure query these changes may
not be included in the returned string.
For example, if the last CONFigure command was:
:CONFigure:SCALar:POWer:WAVelength 1300NM, MAX
a CONFigure? query would return a string that is similar
to the following line:
"POW:WAV 1.300000e-6,0.01"
The 1300NM and resolution values track the actual
instrument settings and input signals. Notice that the
quotation marks are part of the returned string.
Return single or multiple measurement values
You can specify whether FETCh, READ, or MEASure
returns a single value (SCALar) or multiple values
(ARRay). The following example specifies SCALar data
which returns a single value.
:MEASure:SCALar:POWer:WAVelength? MAX
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