6
Step What to do Check
1 Connect a dummy diode between LD+
and LD-. Alternatively make a short
circuit there.
Refer to section “Test Load”.
Range of compliance voltage
0 V .. 20 V.
2 Set the working point of the LDP-CWL. There are three different working
points: pulse mode, modulation mode
and cw mode.
Refer to the section “Description of
the Connectors of the LDP-CWL 06-
20 / LDP-CWL 12-20”
3 Connect GND, Vcc on power connector
(power source disabled). Range of Vcc 15 V .. 48 V. Minimum
10 V above compliance voltage.
Required max. current is about
6 A /12 A.
4 Connect waveform generator on input
terminal (no pulse before power supply
enabled).
Refer to all sections referencing input
(connector #2).
5 Enable the power source.
6 Adjust max. current scaling of the crow-
bar. Use the Set_Imax potentiometer 1
(refer to the picture above) for scaling
of the crowbar. Scale 0.3 V/A.
7 Feed a signal on the input terminal. For
example 1 kHz sine wave with 1 V
amplitude and 0.5 V DC offset while the
LDP-CWL is in the “pulse mode”.
Make sure not to overload the laser
diode or the driver.
Range of input signal 0 V .. 4.8 V.
8 Monitoring of the output current. On current monitor you can measure a
signal comparable with the input
signal. Use an oscilloscope with a 1
MEG ohm termination. Scale 0.3 V/A.
9 Disable the input signal and turn off the
power source. Remove the test diode or
bypass and assemble the final laser diode.
10 Turn the power supply for the Vcc back
on.
Range of Vcc 15 V .. 48 V. Minimum
10 V above compliance voltage.
11 Feed a signal to the input terminal. Make sure not to overload the laser
diode!
