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The PRO8000 (-4) / PRO800 “ELCH” – macro functions 59
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© 2012 Thorlabs
4.7.9 Example of an ELCH measurement procedure
Here we show an ELCH measurement sequence (after system configuration) which
measures the photocurrent of a laser internal and an external photo diode in
dependence from the laser current.
:SLOT 2
Select LDC module in slot 2
:ILD:START 10e-3
Start value for ILD 10 mA
:ILD:STOP 100e-3
Stop value for ILD 100 mA
:ELCH:STEPS 101
The current range is divided in 101 steps
:ELCH:MEAS 3
3 measurements for every step
:VLD:MEAS 1
Select VLD (measured) to be on position 1 in the
output string
:IMD:MEAS 2
Select IMD to be on position 2
:SLOT 3
Select module in slot 3
:PORT 1
Select
input
port
1
of the photo-amplifier module
:IPD:MEAS 3
Select measured photocurrent of module 3 on
position 3
:SLOT 2
Return to slot 2 (the module which gives the
independent parameter, i.e. the value which is
stepped through, must be selected when starting
ELCH).
:LASER ON
Switch on the laser
Because Thorlabs
laser controllers use a soft start function to not endanger the laser
diode, you should include a 1-2 second break here, to allow the laser current to
stabilize!
:ELCH:RESET 0
Resets the ELCH data pointers
:ELCH:RUN 1
Starts ELCH measurement in continuous mode