LDTC-LAB datasheet(20/31 Pages) WAVELENGTH

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INTELLITUNE CONTINUOUSLY

OPTIMIZES

Once a system is run through the IntelliTune process, the PID

coefficents are adjusted as the setpoint, tune mode, or bias

current is changed. The IntelliTune setpoint does not need

to match the system setpoint if the system setpoint is very

high or very low. Run IntelliTune at a setpoint about 5ºC away

from ambient. IntelliTune stops if the sensor is changed or the

tuning mode is set to Manual Tuning.

During an IntelliTune process, the current limits are set to

10% of the initial values. The limit icon glows red frequently.

Current limits are restored after the scan is complete.

See Application Note AN-TC13: IntelliTune® vs. Conventional

Autotune for an in-depth exploration of IntelliTune.

ENABLE, STATUS, & FAN PINS ON

THE TE OUT/SENSOR D-SUB

Figure 33. TE OUT/SENSOR 15+2-pin D-SUB

REMOTE ENABLE INPUT (PINS 5 & 6)

This is a TTL signal that will override the front panel TC

ENABLE button. The default polarity is ENABLE HIGH. Use

0 V to disable the output regardless of the front panel enable

button. An internal 100 kΩ pull-up resistor means no external

voltage is required for front panel operation with the default

polarity. The polarity can be changed by remote command.

ENABLE STATUS (PINS 7 & 9)

This is a TTL signal that goes HI when the TC output current

is enabled.

AT TEMPERATURE STATUS (PINS 8 & 9)

This is a TTL signal that goes HI when the actual temperature

is within the window defined by setpoint ± tolerance.

FAN CURRENT DRIVE (PINS 10 & 11)

This output will drive 12 V up to 0.5 A to power a fan for airflow

across the thermoelectric and load.

LD OPERATING INSTRUCTIONS

ACCESS THE LD SCREENS

Ensure that the instrument is on the LD Screens

by pressing the LD Screen button if the LD

Control Screen (see

Figure 35) is not active.

SET LD LIMITS

1. Press to access the LD Limit Screen.

2. Press

LD Limit Current, Maximum Laser

Voltage, and/or Cable Resistance values and

rotate the adjustment knob to change each

value. The instrument will beep when set.

The LDTC LAB utilizes a clipping current limit. If current

reaches the set limit, the instrument will keep output current

at the limit. It will not disable output if the limit is reached.

Figure 34. LD Limit Screen

NOTES:

• The

Limit Current should not exceed the damage current

threshold of the laser.

• The

Maximum Laser Voltage can be lowered to minimize

internal instrument temperature or to act as a compliance

voltage clamp on the laser output current. See Additional

Technical Notes for optimization instructions.

• The

Cable Resistance range is 0-10 Ω.

CONFIGURE INTERLOCKS

The included LDTC Interlock Kit supplies equipment to satisfy

all interlocks required for operation.

1. For the passive interlock, on the rear panel, short Pins 2

and 3 of the LD DRIVER D-SUB.

2. For the active interlock, on the rear panel, insert a BNC

terminator in the ACTIVE LOCK BNC port.

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

to enable the current to the laser.

NOTE: The key can only be removed when in the LOCKED

( ) position.

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