THORLABS PM200 Operation Manual page 30

PM200
(cathode to pin 4) and an interlock (1..10 k
connected. In order to measure the power, a response curve of the used photo
diode must be loaded. If no responsivity curve is available, the PM200 uses a
default responsivity of 1A/W, and only photo current measurement is possible.
Note
Please take care for the correct polarity of the photo diode - the anode needs to
be connected to analog ground (pin 3)!
Set the Sensor Type to 'Photodiode Detector' in the 'Measurement Settings'
panel. For correct power measurement, the response curve (*.csv file) of the
used photo diode must be loaded.
Note
It's important that the response curve file is a true comma separated values file -
the separator must be a comma (,) not a semicolon (;)! Less important is the file
extension - it can be a *.txt file as well. The response curve file must not contain a
header!
Copy the appropriate *.csv file from an external flash memory (e.g., USB stick)
to the folder LOCAL > response-curves, using the File Manager
Click to the 'PD Adapter' tab in the upper left corner of the display, click to the
'select curve' button on the screen bottom.
Select from the 'LOCAL > response-curves' folder the desired file and hit the
select button.
The responsivity curve now will be displayed and used for calculations. If no
responsivity curve is available, the PM200 uses a default responsivity of 1A/W,
and only photo current measurement is possible.
Example
A Thorlabs FDS100-CAL calibrated photo diode, s/n 10112420, is used with
PM200.
The calibration data can be downloaded from Thorlabs' website - search for the
item FDS100-CAL, on the product site a table can be found.
Select the tab "Calibration Data", enter the serial number and download the
provided calibartion data file FDS100-CAL 2010112420_103280830.txt to a
USB memory stick.
Edit the file and remove the header lines.
Connect the USB memory stick to the PM200
Copy the file to the folder LOCAL > response-curves, using the File Manager
Click to the 'PD Adapter' tab in the right upper corner of the display, click to the
'select curve' button on the screen bottom.
28
between pin 7 and pin 3) must be
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