LDTC-LAB datasheet(4/31 Pages) WAVELENGTH

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QUICK CONNECT GUIDE

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 A TEST LOAD – TC

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.

Wire a test load to a 15+2 D-SUB plug and insert the plug into

the

TEC Out/Sensors D-SUB port located on the back panel.

10 kΩ

SENSOR- (1)

SENSOR+ (2)

LOAD Recommendation

0 to 5 A: 1 Ω, > 25 W

0 to 10 A: 0.5 Ω, > 50 W

Resistors may require

heatsinking.

LOAD

TEC+ (A1)

TEC- (A2)

Test Load

Thermistor Test Load

Figure 1. TC Test Load Wiring Schematic

Setting up this test load allows current to be driven to either

the positive or negative limit. Choose units of Sensor Raw

and change the setpoint above or below the 10 kΩ value. This

confirms proper operation and direction of the current flow.

WIRE A TEST LOAD – LD

We recommend using a test load when first configuring the

LDTC LAB instrument. The test load shown in

Figure 2

simulates a laser load.

Note that Type A and B lasers use the top DB15 (female)

connector, while Type C lasers use the bottom DB15 (male)

connector.

1N4001

LDC

(Pin 9)

LDA

(Pin 1)

1 Ω, 2 W

Constant Current Mode

Figure 2. Test Laser Load (Constant Current Mode)

CONFIGURE LD INTERLOCKS

1. For the passive interlock, short Pin 2 and Pin 3 on the

appropriate LD D-SUB on the rear panel (this is already

done on the connectors delivered with the instrument).

2. For the active interlock, insert a BNC terminator in the

ACTIVE LOCK on the rear panel (provided with the

instrument).

3. On the front panel, the key switch must be set to UNLOCK

to enable laser current output.

TURN ON POWER

Press the

Power switch on the back panel to the | position.

The touchscreen is activated, and the Dual Monitor Screen is

visible.

NAVIGATE THE FRONT PANEL

There are two separate sets of screens: laser diode control

(LD) and temperature control (TC). The TC screens always

display temperature or sensor units in large green (un-

editable) text. The LD screens always display LD current, in

large green (un-editable) text.

Figure 3. Use these buttons to navigate between sets of

screens on the LDTC LAB.

Left: LD screens

Right: TC screens

SET THE LIMITS – TC

1. Access the TC screens.

2. Press to access the TC Limit Screen.

3. On the TC Limit Screen, press the blue Limit

Current values and rotate the adjustment knob to change

to the desired values. The instrument will beep when set.

The positive and negative current settings indicate the

direction of flow during heating and cooling. Both values

are set as a positive number.

4. Press and adjust the MAX TEMP and MIN TEMP

values. The temperature setpoint is restricted by these

values, and the laser diode current can be disabled if load

temperature exceeds these limits.

CHOOSE A TC SENSOR

1. Press to access the Sensor Screen.

2. Press the sensor name and turn the

adjustment knob to cycle through the factory

defaults or any user-defined sensors.

Choose the sensor to match the test load or the appropriate

sensor for the test load. Thermistors also require choosing the

correct bias current. The 10 kΩ thermistor test load suggested

uses a 100 µA bias current.

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