12
GENERAL OPERATING
INSTRUCTIONS
Wiring and instrument navigation are followed by instructions
specific to the temperature control portion of the LDTC LAB,
and instructions discussing the laser driver functionality of the
LDTC LAB.
Temperature controller (TC) instructions begin on
Laser driver (LD) instructions begin on
CONNECT THE POWER
On the back panel, insert the female end of the IEC AC power
cable into the Power receptacle and then plug the male end
into the AC power source.
NOTE: Place the LDTC LAB instrument at least 6” away
from any wall to provide adequate ventilation and prevent
overheating.
WIRE TEST LOADS
TEMPERATURE CONTROL TEST LOAD
We recommend using a test load and simulated thermistor
when first configuring the LDTC LAB instrument. The
thermistor test load simulates a 10 kΩ thermistor operating at
25ºC, feeding a constant 10 kΩ to the control system.
Wire a 15+2 D-SUB plug to a test load and insert it into the
TE Out and Sensors D-SUB
port located on the back panel.
10 kΩ
SENSOR- (1)
(2)
R
LOAD
Recommendation
0 to 5 A: 1 Ω, > 25 W
0 to 10 A: 0.5 Ω, > 50 W
Resistors may require
heatsinking.
R
LOAD
TEC+ (A1)
TEC- (A2)
Test Load
Thermistor Test Load
Figure 11. Test Temperature Load/Sensor Wiring Schematic
Setting up this test load allows current to be driven to either
the positive or negative limit. Choose units of Sensor Raw,
configure the sensor as a 10 kΩ thermistor with 100 µA bias
current, and change the setpoint above or below the 10 kΩ
value. This confirms proper operation and direction of the
current flow.
LASER DIODE CONTROL TEST LOAD
We recommend using a test load when first configuring the
LDTC LAB instrument. The test load shown in
simulates a laser load.
NOTE: Type A and B lasers use the top DB15 (female)
connector, while Type C lasers use the bottom DB15 (male)
connector.
1N4001
1N4001
LDC
(Pin 9)
LDA
(Pin 1)
1 Ω, 2 W
Constant Current Mode
Figure 12. Test Laser Load (Constant Current Mode)
After practicing with a test load to gain comfort and proficiency
with the operation of the instrument, wire the sensor,
thermoelectric or resistive heater, and laser diode.
WIRE A TEMPERATURE SENSOR
Wire the sensor to the correct pins on the
TE Out/Sensors D-SUB. Wiring depends on which type of
sensor is used.
1
2
R
T
1
2
2-Wire
RTD
Sensor -
Figure 13. Thermistor (left) and RTD (right) Wiring Schematics
AD590
4
3
+
-
LM335
3
4
+
-
Figure 14. AD590 (left) & LM335 (right) Wiring Schematics
