Calibrating A Photo Diode (Calpd) - THORLABS ITC502 Operation Manual

3.6.10 Calibrating a photo diode (CALPD)

Programming:
Syntax:
":CALPD:SET <NR3>"
Valid Range: Depends on the instrument type.
Default Value: 1.0 A/W
Assumption: The laser diode output is switched off.
Description: Sets the sensitivity (η) of the monitor diode. Unit: [A/W].
Reading the set sensitivity:
Syntax:
":CALPD:SET?"
Response:
[:CALPD:SET <NR3>]
Description: Queries the programmed sensitivity of the monitor diode. Unit: [A/W].
Reading the minimum sensitivity:
Syntax:
":CALPD:MIN?"
Response:
[:CALPD:MIN <NR3>]
Description: Queries the minimum allowed sensitivity of the monitor diode.
Unit: [A/W].
Reading the maximum sensitivity:
Syntax:
":CALPD:MAX?"
Response:
[:CALPD:MAX <NR3>]
Description: Queries the maximum allowed sensitivity of the monitor diode.
Unit: [A/W].
This calibration is used for the command POPT. It differs from the
calibration factor set with the potentiometer located next to the LED P
that is responsible for the 4 ½ digit display. If the value on the display shall
be equal to that read back via the interface, a manual calibration has to be
(Refer to chapter 2.11, "Adjusting the power display of an internal monitor diode" on
page 38)
NOTE
done too.
3.6 ITC5xx specific commands
LD
ITC500 / page 77