ILX Lightwave LDC-3916338 User Manual page 97

It will be necessary to connect various loads and circuits to the outputs of the module for the calibration procedure.
The devices required for most of the calibration loads are listed in Table 5.2. A schematic is shown in Figure 5.1 for
the photodiode calibration circuit, with the required components listed in Table 5.3.
LASER CURRENT SOURCE CALIBRATION
Current Source Calibration
Voltage Measurement Calibration
PHOTODIODE MONITOR CURRENT CALIBRATION (See schematic in Fig. 5.1)
Interlock - (1)
Interlock - (2)
LD Cathode (5)
LD Anode (9)
PD Cathode + (6)
PD Anode - (7)
9-Pin D-Sub
COMPONENTS FOR PHOTODIODE CURRENT (I PD ) CALIBRATION CIRCUIT
R1
R2
R4
R3
U1
Battery
Connector
CALIBRATING AND TROUBLESHOOTING THE 3916338 CURRENT SOURCE MODULE
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Table 5.2 Required Calibration Components
R4
1 M
Ammeter R1
V
49
A
U1 TIL117
Voltmeter
6
5
9 V Batt
Ipd Current
4
CALIBRATION CIRCUIT
Figure 5.1 I PD Calibration Circuit
Table 5.3 Components for Ipd Calibration Circuit
PAGE 2
1Ω 20W resistor, low TCR
5Ω 50W resistor, low TCR
R2
R 3
100
1
2
3
49Ω resistor, 1% 1/4W
100Ω resistor, 1%, 1/4W
1.0 MΩ resistor, 1% 1/4W
5Ω resistor, 1%, 10W
TIL 117 opto isolator
9V Battery
9-pin D-Sub, Male
CHPT 5