Keysight N777 C Series Programming Manual page 71

Command: :SOURce0:WAVelength:SWEep:FLAG?
Syntax: :SOURce0:WAVelength:SWEep:FLAG?
Description: The sweep flag is used to find out when logging data is available and when the next sweep cycle may be triggered.
It may also be used as a sweep cycle counter, where: flag/2 = number of sweep cycles
The flag is:
•
•
•
•
•
•
If the trigger input isn't configured to start a sweep cycle the flag is increased by two when the logging data is available.
If no logging data is calculated, because the user doesn't want lambda logging, the flag is incremented at the end of the
sweep cycle regardless
Sweep state
start
sweep waiting for trigger
trigger ->
first cycle | start moving back | do some postprocessing | logging data available
sweep waiting for next trigger
Parameters: none
Response: The current sweep flag value as a signed integer value
Example: :sour0:wav:swe:flag? -> +30
Affects: All tunable laser modules except N7779C.
Command: :SOURce0:WAVelength:SWEep:LLOGging
Syntax: :SOURce0: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 :READout:DATA? command.
The following settings are the prerequisites for Lambda Logging:
Set :WAVelength:SWEep:MODE to CONTinuous.
Set :TRIGger[n][:CHANnel[m]]:OUTPut to STFinished (step finished)
Set :AM:STATe[l] 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.
Keysight N777xC Series Tunable Laser Family Programming Guide
only used in continuous sweep
set to 0 at start/end of sweep
incremented when the sweep is waiting for a trigger
incremented when logging data is available
an odd number when, waiting for a trigger
an even number when, logging data may be read
Measurement Operations & Settings
Flag
0
1
2
3
4
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