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4-9
Programming
Making Measurements
Measurement instructions give quick results
The easiest way to measure wavelength, frequency, power, or coherence
length is to use the MEASure command. The MEASure command is one of
four measurement instructions: MEASure, READ, FETCh, and CONFigure.
The syntax for measurement instructions
is
documented in “Measurement
Instructions” on page 5-15.
Each measurement instruction has an argument that controls the measure-
ment update rate. This is equivalent to using the
NORMAL
and
FAST
softkeys.
:MEASure command
MEASure configures the Agilent 86120B, captures new data, and queries the
data all in one step. For example, to measure the longest wavelength, send the
following command:
:MEASure:SCALar:POWer:WAVelength? MAX
Specifying SCALar places the display in the single wavelength format and
returns a single value to the computer. Specifying ARRay places the display in
the
List by Power
or
List by WL
modes; an array of data is returned to the com-
puter.
Table 4-2. The Different Forms of MEASure
Desired
Measurement Data
Use this
MEASure Query
Display Format
Power (W, dBm) :MEASure:ARRay:POWer? List by Power
:MEASure:SCALar:POWer? single wavelength mode
Frequency (Hz) :MEASure:ARRay:POWer:FREQuency? List by WL
(frequency)
:MEASure:SCALar:POWer:FREQuency? single wavelength mode
Wavelength (m) MEASure:ARRay:POWer:WAVelength? List by WL
MEASure:SCALar:POWer:WAVelength? single wavelength mode
Wavenumber (m
–1
)
:MEASure:ARRay:POWer:WNUMber? List by WL
:MEASure:SCALar:POWer:WNUMber? single wavelength mode
Coherence Length (m) :MEASure:LENGth:COHerence? coherence length