PLD-200 / PLD-500 / PLD-5000
9
____________
Operating Procedures for Type A or B laser 5V operation
________________
Constant Current Mode
With the Output Disabled:
(1) Configure Mode Switch to I.
[switch on top of PLD]
(2) Set Limit Current:
Monitor pins 5 & 6, adjust Current
Limit trimpot clockwise until the voltage at pin 5
corresponds to the desired voltage.
NOTE:
Current limit needs to be set 0.2 V above desired limit
level.
Limit Current and I Monitor Transfer Functions
PLD-200
80mA/Volt
PLD-500
200mA/Volt
PLD-5000
2 Amp/Volt
Once Current Limit is detected, the output will turn off
and the LIM I led will illuminate red. The LIM I Status
voltage and LIM I LED will stay on until the LD Enable is
toggled off then on, and the error no longer exists.
(3) Set Operating Current.
Use the transfer function from
step 2 to calculate the desired current. Monitor pins
7 & 6. With the OUTPUT ADJUST trimpot fully CCW,
enable the output. Slowly adjust the OUTPUT ADJUST
trimpot CW until the desired voltage is measured at
pin 7.
(4) Monitor the Photodiode (optional).
If the Photodiode is
connected to the laser diode, monitor pins 8 & 6. The
PD switch on top of the PLD will determine the output
transfer voltage by the position of the switch:
L = 200
µ
A / V
H = 2 mA / V
(15 - 500
µµµµµ
A range)
(50 - 5000
µµµµµ
A range)
(5) Analog Input:
This input is designed for analog signals
only and should not be used with TTL signals. You can
either input a DC voltage for remote current setpoint
control or use this input to modulate the laser diode.
This input sums directly with the output adjust trimpot.
The input transfer function will depend on the PLD
model in use.
Model
Transfer Function
PLD-200
40 mA / Volt
PLD-500
100 mA / Volt
PLD-5000
1 Amp / Volt
_________________
Constant Power Mode
With the Output Disabled:
(1) Configure Mode Switch to P.
[switch on top of PLD]
(2) Set Limit Current:
Monitor pins 5 & 6, adjust Current
Limit trimpot clockwise until the voltage at pin 5
corresponds to the desired voltage.
NOTE:
Current limit needs to be set 0.2 V above desired limit
level.
Limit Current and I Monitor Transfer Functions
PLD-200
80mA/Volt
PLD-500
200mA/Volt
PLD-5000
2 Amp/Volt
Once Current Limit is detected, the output will turn off
and the LIM I led will illuminate red. The LIM I Status
voltage and LIM I LED will stay on until the LD Enable is
toggled off then on and the error no longer exists.
(3)
Set the output power.
Determine the photodiode current (I
M
at operating
current I
OP
) from data provided with your laser diode.
Monitor pins 8 & 6. Set the
PD Range Switch
for
the appropriate photodiode current
L = 15 - 500
µµµµµ
A H = 50 - 5000
µµµµµ
A
With the OUTPUT ADJUST trimpot fully CCW,
enable the output. When the laser reaches
threshold, the photodiode current changes abruptly
and rises quickly. Adjust the
OUTPUT ADJUST
trimpot slowly until the voltage at pin 8 corresponds
to the desired photodiode current. Transfer
functions for Low and High Photodiode mode are:
L = 200
µ
A / V H = 2 mA / V
(4) Analog Input
This input is designed for analog signals
only and should not be used with TTL signals. You can
either input a DC voltage for remote power setpoint or
use this input to modulate the laser diode. This input
sums directly with the output adjust trimpot. The input
transfer function is the same for all models and depends
on the PD RANGE switch setting.
L = 100
µ
A / V H = 1 mA /
V
________________________________________________
External Adjustments
CAUTION: DO NOT
change
switch positions while the
output is enabled; doing so
may damage your laser diode.
OUTPUT ADJUST:
This 12-turn trimpot adjusts the laser diode forward current
in constant current mode and monitor photodiode current in constant power
mode.
ACTIVE LIMIT CURRENT ADJUST:
This 12-turn trimpot adjusts the maximum
laser diode forward current.
OUTPUT ENABLED LED:
Illuminates green when laser diode current is
enabled. The LED is not lit when the output is disabled.
LIMIT I LED:
Illuminates red when output current has reached the limit
current level (as set by LIMIT I Adjust Trimpot). LED will stay red until the
output has been disabled then re-enabled with the condition corrected.
PD Range
L
H
Mode
P
I
15-500
µ
A
50-5000
µ
A
Constant Power
Constant Current
Switch Setting
Содержание PLD Series
Страница 10: ...PLD 200 PLD 500 PLD 5000 10 __________ Typical Setup for Type A or B laser diode Negative Supply operation ...
Страница 11: ...PLD 200 PLD 500 PLD 5000 11 ______________________ Operating the PLDPCB with Type A B Laser Diodes ...
Страница 14: ...PLD 200 PLD 500 PLD 5000 14 _________________________ Operating the PLDPCB with Type C Laser Diodes ...
