C A L I B R A T I O N A N D T R O U B L E S H O O T I N G
Calibration Overview
7/01
LDC-3700 Series
121
C H A P T E R
5
one−fourth (1/4) of the original current. (For example, if the first calibration set point was
4000
µ
A, the second set point will be about 1000
µ
A.)
6
Press and hold in the (
PARAMETER
)
SET
switch and turn the
ADJUST
knob until the
LASER display indicates the actual current as measured by the ammeter or as calculated.
7
Release the (
PARAMETER
)
SET
switch to accept the second calibration point. After the
(
PARAMETER
)
SET
switch is released, the LDC−3700B Series Laser Diode Controller
will calculate the calibration constants and store them to nonvolatile memory.
Laser Forward Voltage Measurement Calibration
The following procedure is for calibrating the LASER voltage measurement.
Configure the Controller in the following manner for the Laser Controller Voltage calibration:
1
With the LASER output off, connect a calibrated voltmeter, in parallel with a resistor
(100
Ω
, 2 Watt for the LDC−3714B; 15
Ω
, 5 Watt for the LDC−3724B or LDC−3744B), to
the LASER output (Laser Anode and Laser Cathode) on the rear panel of the controller.
2
Press the (
LASER
MODE
)
ON
switch to turn the
LASER
output on The LASER output
must be on in order to enter the LDV calibration mode.
3
Enter the
LASER
V
calibration mode by pushing the (
GPIB
)
LOCAL
and (
LASER
DISPLAY
)
V
switches at the same time. The TEC display will blank and the controller will
drive the LASER current output to the respective set point and the LASER display will
indicate forward voltage in Volts.
4
Enter the measured voltage (in volts). Press and hold in the (
PARAMETER
)
SET
switch
and turn the
ADJUST
knob until the
LASER
display indicates the measured voltage.
5
Once the actual voltage value is entered, the Controller will set the current to
approximately one−fourth (1/4) of the original value. It will then expect the second
calibration voltage point.
6
Input the second actual (measured) LASER forward voltage.
7
Once the second actual voltage value is entered, the Controller stores the new calibration
constants.
Function
State
Laser Mode
I (constant current low bandwidth)
Range
LDC−3714B
LDC−3724B
LDC−3744B
100 mA
500 mA
2000 mA
Laser Limit
set to FS (full scale of range)
I Set Point
LDC−3714B
LDC−3724B
LDC−3744B
60 mA
400 mA
400 mA
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