Keysight Technologies 86120B, User Manual

Page: 114 / 273

112
Programming
Example Programs
Example 2. Measure WDM channels
This program measures the multiple laser lines of a WDM system. It measures both
the power and wavelengths of each line. First, the program sets the
Keysight 86120B in the single-acquisition measurement mode. Then, it triggers the
Keysight 86120B with the MEASure command to capture measurement data of the
input spectrum. Because the data is stored in the instrument’s memory, it can be que-
ried as needed.
Refer to the introduction to this section for a description of each subroutine that is
contained in this program.
COM /Instrument/ @Mwm
ASSIGN @Mwm TO 720
ON ERROR GOTO Error_msg,
Set_ese
PRINT USING "37A,33A";"Multi-Wavelength Meter Identity is : ";FNIdentity$
OUTPUT @Mwm;":INIT:CONT OFF"
ON TIMEOUT 7,5 CALL Err_mngmt
OUTPUT @Mwm;":MEAS:ARR:POW:WAV?"
ENTER @Mwm USING "#,K";Nb_wl
ALLOCATE Current_wl(1:Nb_wl)
ENTER @Mwm USING "#,K";Current_wl(*)
OUTPUT @Mwm;":FETC:ARR:POW?"
ENTER @Mwm USING "#,K";Nb_wl
ALLOCATE Current_pwr(1:Nb_wl)
ENTER @Mwm USING "#,K";Current_pwr(*)
FOR I=1 TO Nb_wl
PRINT USING "22A,2D,6A,4D.2DE,4A,S2D.2D,3A";"The wavelength number
";Current_wl(I);" at ";Current_pwr(I);"dBm"
NEXT I
OFF TIMEOUT
STOP
Error_msg:
PRINT "the prgm is aborted due to : ";ERRM$
END