3.6 ITC5xx specific commands
ITC500 / page 77
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].
NOTE
This calibration is used for the command POPT. It differs from the
calibration factor set with the potentiometer located next to the LED P
LD
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
done too.
(Refer to chapter 2.11, “Adjusting the power display of an internal monitor diode“ on
page 38)
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