Functions in the channel menu
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© 2012 Thorlabs
2.2.3 Selecting the polarity of the photo diode
To change the polarity of the photo diode select
POL1 =
for input 1
POL2 =
for input 2
in the channel menu of the module. It then can be changed to the desired polarity.
(Refer to chapter 2.2.2, "Changing parameters" on page 10)
NOTE
If the selected polarity of the photodiode is wrong the measured photodi-
ode current will be displayed negative. Trying to set a bias voltage or to
measure the forward voltage (opt. PDA8000-FWD) will yield an error
message.
2.2.4 Calibrating the photo diode
If the displayed optical power shall be calibrated, the correct sensitivity
of the photo
diode must be entered.
If for example
is 0.5 A/W this can be done in the channel menu entering the value
C1=0.5000A/W
for input 1
C2=0.5000A/W
for input 2
The default value of
is 0.1000 A/W. It is valid without specific confirmation.
2.2.5 Setting the bias voltage
Each input can operate with a bias voltage in the range of 0 ... 10 V.
If for example the photo diode shall work with 3.000 V bias voltage this can be
entered in the channel menu :
U
BIA
1= 3.00 V
for input 1
U
BIA
2= 3.00 V
for input 2
(Refer to chapter 2.2.2, "Changing parameters" on page 10)
