Keysight Technologies 86120B, User Manual

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89
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 measure-
ment instructions is documented in
“Measurement Instructions” on page 146 .
Each measurement instruction has an argument that controls the measurement
update rate. This is equivalent to using the
NORMAL and FAST softkeys.
:MEASure command
MEASure configures the Keysight 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 computer.
Table 2-6. 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