Local Calibration Of The Ldx-3200 Series Current Source; Local Calibration Of The Ldx-3200 Series Current Source - ILX Lightwave LDX-3200 Series User Manual

It will be necessary to connect various loads and circuits to the outputs of each Current Source for the calibration
procedure. A schematic is shown in Figure 6.1 for the photodiode calibration circuit with the required components
listed in Table 6.2. Also, the devices required for other calibration loads are listed in Table 6.2.
LASER CURRENT SOURCE CALIBRATION
Current Source Calibration, all models
Voltage Measurement Calibration
LDX-3210
LDX-3220
PHOTO-DIODE MONITOR CALIBRATION (See schematic in Fig. 6.1)
PD cal circuit
R1
R2
R4
R3
LDX-3210
LDX-3220
U1
9-Pin D-Sub
LD Cathode (5)
LD Anode (9)
PD Cathode + (6)
PD Anode - (7)

LOCAL CALIBRATION OF THE LDX-3200 SERIES CURRENT SOURCE

There are three calibration adjustments required for the LASER current source of the LDX-3200 Series Current
Source. They are calibration of the constant current source for both bandwidths and ranges, calibration of the laser
voltage measurement, and calibration of the constant light power (I
The LDX-3200 Series Current Source implements a two-point calibration for the Laser current source. Two currents
(approximately 80% and 20% of FS) are applied to a test load, and the resulting actual currents are fed back (by the
user) to the Current Source. The Laser Current Source calibration program uses the two sets of data to calculate new
calibration constants. These calibration constants are used to set the actual current output of the current source.
CALIBRATING THE LDX-3200 SERIES CURRENT SOURCE
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Table 6.2 Required Calibration Components
R4
1 M
R1
V
49
U1 TIL117
Voltmeter
6
5
A
Ipd Current
Ammeter 4
CALIBRATION CIRCUIT
Figure 6.1 I Calibration Circuit
PD
PAGE 2
1Ω 20W resistor, low TCR
100Ω 2W resistor, low TCR
25Ω 5W resistor, low TCR
49Ω resistor, 1% , ¼ W
100Ω resistor, 1%, ¼ W
1.0 MΩ resistor, 1%, ¼ W
49Ω, ½ W, low TCR
11Ω, 1 W, low TCR
TIL 117 opto isolator
R2
R 3
100
1
2
3
) feedback circuits.
PD
CHPT 6