170 8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide
4 Measurement Operations & Settings
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 wavelength 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.
The following settings are the prerequisites for Lambda Logging:
Set [:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:MODE on page 171 to CONTinuous.
Set :TRIGger[n][:CHANnel[m]]:OUTPut on page 213 to STFinished (step finished).
Set
[:SOURce[n]][:CHANnel[m]]:AM:STATe[l] on page 127 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.
Lambda logging is disabled at the end of a sweep.
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 that support continuous sweep.
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 that support continuous sweeps.
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