4.7 LDC340 specific commands
LDC340 / Page 48
4.7.10 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 calibra-
tion 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 should be
equal to that read back via the interface a manual calibration has to be
done too.
(Refer to chapter 3.1.4, “Adjusting the power display of an internal monitor diode“ on
page 14)
