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COMMAND REFERENCE
LDX-3232 Device-Dependent Command Reference
68 LDX-3232
CHAPTER 4
The LASer:MDI command sets the value of the optical power setpoint, in µA, if the
CALMD (CAL PD) responsivity is 0.
Syntax Diagram
Parameters An <nrf value> that represents the photodiode feedback current, in µA.
Notes If the CALMD (CAL PD) parameter is not set to 0, the LAS:MDI value will not be used. In
this case, the measured MDI would be converted to MDP (P
PD
, by the CAL PD factor),
and the MDP (P
PD
) setpoint would be used.
Examples "Las:Mdi 40" -action: The LASER output is controlled so that the photodiode feedback
current remains constant at 40 µA.
"Laser:MDI 200" -action: The LASER output is controlled so that the photodiode
feedback current remains constant at 200 µA.
The LASer:MDI? query returns the value of the laser photodetector current measurement
in µA.
Syntax Diagram
- where the response is the most recent LASER monitor current measurement.
Notes The response is in µA. The response is valid, even when the unit is not in constant P
mode.
This measurement is updated approximately once every 600 ms.
Examples "Las:Mode:MDP; Las:Calmd 0; Las:MDi?" -response: 100.0, means 100 µA of
photodetector current. This feedback is controlling the laser current output.
"LAS:MODE:IHBW; LAS:MDI?" -response: 20.0, means 20 µA of photodetector current,
but photodiode monitor current is not controlling the laser output current.
LASer:MDI
FRONT PANEL
REMOTE
LASer:MDI?
FRONT PANEL
REMOTE
<white
space>
<nrf
value>
:
:
MDI
IPD
LAS
:
LAS
MDI
:
?
IPD