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4-11
Programming
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 generates error number –230,
“Data corrupt or
stale”
. In this instance, you must send :INIT:IMM after the *RST command and
before :FETCh command to capture a new array of measurement data.
:CONFigure command
The CONFigure command changes measurement settings without taking a
measurement. The instrument is placed in the
List by WL
,
List by Ampl
,
Peak WL
display, or in the coherence length application.
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 CONFig-
ure 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 SCA-
Lar data which returns a single value.
:MEASure:SCALar:POWer:WAVelength? MAX