ILX Lightwave LDC-3700B Series - Local Calibration of the LDC-3700 B Temperature Controller; Calibrating the Thermistor; Table 5.2 Required Calibration Components

CALIBRATION AND TROUBLESHOOTING
Calibration Overview
7/01 LDC-3700 Series 115
CHAPTER 5
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Local Calibration of the LDC-3700B Temperature Controller
The following procedure is for calibrating the 100 µA and 10 µA thermistor current sources so that
the thermistor resistance measurement for these ranges will meet the stated accuracy
specifications.
Calibrating the Thermistor
1 Set the SENSOR SELECT switch (back panel) to the 100 mA position, the TEC display
code is −−01.
2 Using the multimeter, measure and record the resistance of your metal film resistors. ILX
recommends a 4−point probe resistance measurement.
3 Connect the correct metal film resistor to the sensor input of the Temperature Controller
15 pin connector on the rear panel, sensor + and sensor − terminals.
4 Enter the TEC sensor calibration mode by pushing the (GPIB) LOCAL and (TEC
DISPLAY) R switches at the same time. The sensor code (SENSOR SELECT switch
position) value displays for 2 seconds. After this, the TEC display indicates sensor
resistance in kΩ.
Table 5.2 Required Calibration Components
LASER CURRENT SOURCE CALIBRATION
Current Source Calibration, all models 1Ω 20W resistor, low TCR
Voltage Measurement Calibration
LDC−3714B
LDC−3724B
LDC−3744B
100Ω 2W resistor, low TCR
25Ω 5W resistor, low TCR
25Ω 5W resistor, low TCR
TEMPERATURE CONTROLLER CALIBRATION
Current Source Calibration, all models 1Ω 20W resistor, low TCR
TEC Voltage Calibration, all models 50Ω 5W resistor, low TCR
Thermistor
10 µA setting
100 µA setting
100 kΩ resistor, 1% 1/4W
10 kΩ resistor, 1% 1/4W
LM335 6.8 kΩ resistor, 1% 1/4W
AD590 16.8 kΩ resistor, 1% 1/4 W
PHOTO−DIODE MONITOR CALIBRATION (See schematic in Figure 5.1 on page 114)
PD cal circuit
R1
R2
R4
R3:
LDC−3714B
LDC−3724B, LDC−3744B
U1
Battery
Connector
49Ω resistor, 1% 1/4W
100Ω resistor, 1%, 1/4W
1.0 MΩ resistor, 1% 1/4W
20 Ω, 1%, 1 W
5 Ω, 1%, 10 W
TIL 111 opto isolator
9 V Battery
9−pin D−sub, Male
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