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Measurement Operations & Settings Signal Generation – The SOURce Subsystem
140 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition
command:
[:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:LLOGging
syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:LLOGging<wsp>OFF|ON|0|1
description: Switches lambda logging on or off. Lambda logging is a feature that records the exact wave-
length of a tunable laser module when a trigger is generated during a continuous sweep. You
can read this data using the [:SOURce[n]][:CHANnel[m]]:READout:DATA? command.
NOTE
The following settings are the prerequisites for Lambda Logging:
Set “[:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:MODE” on page 141 to CONTinuous.
Set “:TRIGger[n][:CHANnel[m]]:OUTPut” on page 176 to
STFinished (step finished).
Set “[:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:CYCLes” on page 137 to 1.
Set “[:SOURce[n]][:CHANnel[m]]:AM:STATe[l]” on page 117 to OFF.
If any of the above prerequisites are not met, then when the sweep is started the status
"Sweep parameters inconsistent" will be returned and Lambda Logging will automatically
be turned off.
NOTE
Lambda logging is disabled at the end of a sweep.
NOTE
Generally, a continuous sweep can only be started if:
the trigger frequency, derived from the sweep speed and sweep step, is <= 40kHz
the number of triggers, calculated from the sweep span and sweep span, is <=100001
the start wavelength is less than the stop wavelength.
In addition, a continuous sweep with lambda logging requires:
the trigger output to be set to step finished
modulation set to coherence control or off.
parameters: 0 or OFF:
1 or ON:
switch lambda logging off
switch lambda logging on
response: none
example: wav:swe:llog 1
affects: All tunable laser modules except Agilent 81649A and Agilent 81689A/B
command:
[:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:LLOGging?
syntax: [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:LLOGging?
description: Returns the state of lambda logging.
parameters: none
response: A boolean value: 0 – lambda logging is switched off
1 – lambda logging is switched on
example: wav:swe:llog? → 1<END>
affects: All tunable laser modules except Agilent 81649A and Agilent 81689A/B