LDTC-LAB WAVELENGTH | Alldatasheet

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Technical content

Laser Diode Driver & Temperature Controller — with IntelliTune® ePb RoHS Compliant Applies to Product Revisions A - E © March 2026

ORDERING INFORMATION

LD250mTC5 LAB 250 mA, 10V Laser Diode Driver 5A, 15 V Temperature Controller LD2TC5 LAB 2 A, 10 V Laser Diode Driver

5 A, 15 V Temperature Controller

LD5TC10 LAB 5 A, 10 V Laser Diode Driver

10 A, 15 V Temperature Controller

One included with each instrument BNC Terminator 50 Ω DB15 Male Connector Kit (LD Type A/B) DB15 Female Connector Kit (LD Type C) TC/SENSOR MATING D-SUB One included with each instrument TE/RH/Sensor Male DB15+2 Connector Kit WCB407 TE/RH/Sensor DB15+2 Cable WCB408 LD Type A/B DB15 Cable WCB409 LD Type C DB15 Cable WCB319 TC to LD Mount Cable WCB326 Type A/B Laser to LD Mount Cable WCB327 Type C Laser to LD Mount Cable THERMISTORS Various Thermistors Available LDMOUNT-5A Butterfly Laser Diode Mount

CONTENTS

ELECTRICAL SPECIFICATIONS 7 THEORY OF OPERATION 9 INSTRUMENT OVERVIEW 9 GENERAL OPERATING INSTRUCTIONS 12 TC OPERATING INSTRUCTIONS 17 LD OPERATING INSTRUCTIONS 20 TROUBLESHOOTING 23 ERROR MESSAGES 25 ADDITIONAL TECHNICAL NOTES 27 MECHANICAL SPECIFICATIONS 28 CABLING SPECIFICATIONS 28 WARRANTY & CERTIFICATION 31 B Laser Type A Laser Type C Laser Type RT AD590 LM335 RTD

FEATURES

(BOTH MODELS) LD 250 mA 2 A 5 A 10 V TC 5 A 5 A 10 A 15 V

  • Low-noise laser current, as low as 3µA, 7 μA, or 16 μA (100 kHz RMS)
  • Temperature stability better than 0.0009ºC with thermistor
  • Safety features protect your research » Adjustable current limits, with Brick-Wall Never-Exceed circuitry » Load failure protection » Temperature limits on the load » Current/voltage limits for both TEC and laser » Automatic laser shutdown upon TEC error available
  • Constant Current (Laser) or Constant Power (Photodiode Current) modes » Three photodiode ranges available: 0.5, 5, or 10 mA » Available photodiode bias voltage » Operates all laser diode/photodiode configurations
  • Compatible with a variety of temperature sensors » Thermistors and two-wire RTDs » Linear voltage and current sensors
  • Continuous Wave (CW) or Quasi-Continuous Wave (QCW) Operation
  • Also capable of driving LEDs
  • Modulation bandwidth 450kHz with external BNC input
  • Laser Diode voltage/current measurements
  • TEC voltage/current measurements
  • IntelliTune sets ideal PID control parameters for optimal time to temperature or fast disturbance rejection
  • Complete TMC command set for remote control from computer
  • LabVIEW® Virtual Instrument, USB interface
  • Field upgradeable firmware
  • Touchscreen with intuitive user interface
  • Data collection using a computer
  • Sophisticated error handling
  • Save and recall functions for specific set ups
  • Feature-rich for research projects LabVIEW is a trademark of National Instruments. ULTRA-STABLE TEMPERATURE CONTROLLER & LOW-NOISE LASER DRIVER The LDTC LAB series instruments combine best-in-class low noise, high-end digital control laser diode driver technology with an IntelliTune® smart temperature controller. If you need stable wavelength, stable temperature (better than 0.0009ºC with thermistors), stable laser diode current or power, or low noise (RMS laser driver noise as low as 3 µA), these offer the best performance and value. The touch-screen interface makes operation intuitive and simple. A LabVIEW ® virtual instrument, remote command set, and USB interface allow integration into an instrument library. Safety features protect the thermoelectric cooler (TEC) and the laser. Over- and under-temperature limits, positive and negative (where applicable) current limits, and voltage limits can be set. If the sensor signal is lost or a short is detected at the TEC, output current is disabled. Passive and active interlocks are available for safety of equipment and user. You can link laser diode current to safe and stable thermoelectric operation. Operation in Constant Current (CC) or Constant Power (CP) mode changes with the touch of a button. A wide variety of sensors work in the temperature control feedback loop. INTELLITUNE ®: INTELLIGENT AUTOTUNE Wavelength’s proprietary IntelliTune algorithm characterizes the TEC/sensor system’s response to the controller and determines the optimal PID control coefficients. It then automatically adjusts the PID control values as setpoint, tuning mode, or bias current change. Run IntelliTune easily just off ambient and watch it change PID settings for a much higher or lower setpoint. After a single scan, explore either optimized Setpoint Response or Disturbance Rejection performance with your load to see which works best. Add or remove the D term to see if noise is an issue. IntelliTune lets you skip the manual characterization, and it’s smart enough to really work—very little adjustment is needed after you have stored a successful characterization scan. See Autotune for an in-depth exploration.

APPLICATIONS

The ultra-stable temperature controller/laser driver instruments are particularly reliable for diverse fields such as medical, defense, communications and manufacturing. Applications include particle and droplet measurement, communications, manufacturing test, and medical systems. Additionally, our products are designed for use with electro-optical systems, airborne instrumentation, spectroscopic monitors, and medical diagnostic equipment.

CAUTION: A condition that has the potential to cause damage to property or instrument. WARNING: A condition that has the potential to cause bodily harm or death. CAUTIONS The LDTC LAB instrument has no user-serviceable parts. Other than the fuses, the LDTC LAB instrument is not designed to be maintained by the user nor does it contain any parts that can be repaired by the user. All maintenance and repairs must be performed by Wavelength or the warranty will be void. Use a soft cloth to remove dust from the LDTC LAB instrument. Do not expose the LDTC LAB instrument to any liquids, sprays, or solvents. To avoid electrical shock, unplug the power cord before cleaning the instrument. Before connecting to the power source, make sure the correct cables for your area are set. WARNINGS Position the LDTC LAB instrument so that access to the Main Power On/Off switch on the back panel is easily accessed. Do not use the LDTC LAB instrument if there is evidence of damage from shipping; damaged equipment can present significant safety hazards. If you suspect the LDTC LAB instrument is damaged, contact Wavelength technical support before attempting to operate the instrument. To avoid electrical shock, use the recommended earth- grounded power cables and properly earth-grounded, 3-prong receptacles only. Failure to follow this precaution can result in severe injury. The instrument may not be operated at measuring category II, III, and IV mains power circuits. In accordance with EN 601010-1:2010, the instrument has been designed without a rated measuring category and may only be used at direct voltage circuits with up to 240 VAC without transient overvoltages Operating safety is no longer assured in the event of modification or alteration. The instrument may only be opened by authorized service technicians. Never operate the instrument at a higher voltage than specified in the technical data. The instrument may otherwise be destroyed or permanently damaged. To avoid injury, do not tell the engineers how to do their jobs. Let them muddle through until they decide to read the User Guide. GENERAL

  • Observe all Cautions and Warnings both in the User Guide and on the instrument.
  • This instrument is designed to be safe to at least the following conditions: indoor use, 6500 ft (2000 m), 80% maximum relative humidity for temperatures up to 31ºC and decreasing linearly to 50% relative humidity at 50ºC, transient overvoltages to Overvoltage Category 2, and environmental conditions to Pollution Degree 2.
  • Use the LDTC LAB instrument as specified in this guide. If not, the protection provided by this instrument may be impaired and the warranty will be voided.
  • The LDTC LAB instrument is intended to be used to control thermoelectrics, resistive heaters, laser diodes and other similar equipment. Please contact Wavelength Electronics for other possible applications.
  • The LDTC LAB instrument must not be operated in explosion endangered environments.
  • The equipment is not protected against liquid spills. Do not install where chemicals are used or where liquids could be spilled into the unit.
  • The safety of any system that incorporates the use of the LDTC LAB series instrument is the sole responsibility of the system assembler. This includes assembly, mounting, location, special ambient or application conditions, and connections within the system.
  • Operating outside of the conditions specified in the User Guide are not recommended for safety reasons.
  • Proper setup in the end user’s environment includes: » Adequately sized thermoelectric and heatsink to properly manage the heat dissipated by the load. » Securely mounted temperature sensor for accurate temperature control. » Correct connection of the thermoelectric and laser. » Use of the ACTIVE LOCK connection to protect the load. POWER CORDS
  • The power cord acts as the power disconnecting device between the AC mains and LDTC LAB instrument.
  • This equipment is grounded through the AC power cord grounding conductor.
  • Use only the earth-grounded power cords that are recommended in this user guide.
  • Route power cords and other cables so that they cannot be damaged.
  • Position the LDTC LAB instrument in a location that makes it easy to quickly disconnect the power cord.
  • To avoid fire hazard, use only the specified power cords with the correct grounding, voltage, and current ratings. FUSES
  • Disconnect the power to the LDTC LAB instrument before changing the fuses.
  • To prevent damage to the LDTC LAB instrument when replacing fuses, locate and correct the problem that caused the fuse to blow before re-applying power.
  • To avoid fire hazard, use only the specified fuse with the correct type number, voltage, and current ratings, and use only the recommended replacement parts.
  1. Press to access the TC Control Screen.
  2. Press the blue Setpoint temperature value

instrument will beep when set. or can be adjusted automatically via IntelliTune. 25ºC and to the negative limit if setpoint is above 25ºC.

  1. Press to access the Laser Diode Driver
  2. Access the LD Limit Screen, press the blue

knob to configure the limits as required. Constant Current or Constant Power mode. Pressing the text toggles the selection. It is not editable while LD current is enabled.

  1. Press to access the Photodiode Screen.
  2. Press the blue text next to "PD Biasing" to
  3. Press the blue text next to "PD Range" until the value

matches the appropriate current range for the photodiode. The available options are 500 μA, 5 mA, and 10 mA.

  1. If the transfer function relating photodiode current to

the "Transfer Function" setting. Units are W/mA. Types A/B and Type C lasers. Figure 4. Laser Type Diagrams by pressing the blue text and turning the adjustment knob. the current limit, actual current will be ~43 mA below setpoint. Press to access the Dual Monitor Screen.

  1. Press the Enable button. The button light will turn off and

current to the test load will stop.

  1. On the back panel, press the power switch to the O

position. The instrument will shut down.

Figure 5. Female 15-Pin D-SUB for Type A/B laser diodes Figure 6. Male 15-Pin D-SUB for Type C laser diodes Table 1. LD DRIVER/MONITORS D-SUB Pin Description

1 Laser Diode Anode

2 Interlock +

3 Interlock –

4 Photodiode Anode

5 Photodiode Cathode

6 Laser Diode Enable Status

7 Laser Diode Remote Enable Input

8 Ground for Status/Enable

9 Laser Diode Cathode

10 Output Current Monitor

11 Laser Diode Setpoint Monitor

12 Monitor Ground

13 No Connection

14 No Connection

15 No Connection

Figure 7. External Modulation & Active Lock BNC Pins Figure 8. Female 15+2 D-SUB Table 2. TE OUT/SENSOR D-SUB Pin Description

1 Sensor –

2 Sensor +

3 IC Sensor (AD590– or LM335+)

4 IC Sensor (AD590+ or LM335–)

5 Remote Enable In

6 Remote Enable Ground

7 Enable Status

8 At Temperature Status

9 Status Ground

10 Fan +

11 Fan –

12 No Connection

ABSOLUTE MAXIMUM RATINGS LD250mTC5 LD2TC5 LD5TC10 UNIT NOTE TEMPERATURE CONTROLLER Maximum Output Current 5 5 10 A Maximum Compliance Voltage [1] 15 V LASER DIODE DRIVER Maximum Output Current 0.25 2 5 A Maximum Compliance Voltage [1] 10 V LASER DRIVER SPECIFICATIONS LD250mTC5 LD2TC5 LD5TC10 UNIT NOTE Cumulative Noise (RMS) [2] 3 7 16 μARMS Measured from 1 Hz to 100 kHz Output Current Stability 125 ppm Free-air, ambient conditions Output Current Temperature Coefficient 75 ppm / ºC Full scale Modulation Bandwidth, CC Mode 450 kHz Modulation Bandwidth, CP Mode 10 Hz Rise/Fall Time, CC Mode 800 ns To full scale Rise/Fall Time, CP Mode 25 ms To full scale Slew Rate 6 V / μs Depth of Modulation 90 % At 150 kHz Input Impedance 2.5 kΩ External Modulation Input Range -5 to +5 V Sums with onboard setpoint External Modulation Input Damage Threshold ±6 V Current Limit Range 0 to 101 % Leakage Current <1 μA Measured with unit on and setpoint at zero Current Monitor Offset: Zero Output Current <1 mV Constant Power Photodiode Range Options 500 μA, 5 mA, 10 mA Constant Power Photodiode Bias Voltage On / Off Laser Turn-On Delay 0 to 3 s Adjustable via remote commands Laser Slow Start Ramp 10-25 ms Feedback Constant Current or Constant Power Setpoint Resolution 18 bits Display Accuracy Measurement Resolution 16 bits External Setpoint Accuracy 0.35 0.25 % External setpoint to real output current Current Monitor Accuracy (front panel display) 0.25 % IMON to real output current Accuracy, ISET vs. Actual Current 0.25 % Accuracy, Analog Setpoint Monitor 0.25 % between 10 & 90% of full scale [1] With current sources, the voltage developed across the load (laser or thermoelectric) is not driven by the controller, but by Ohm's Law and the resistance of the load. [2] Noise performance for the LD250mTC5 is for Type-A lasers only.

LD250mTC5 LD2TC5 LD5TC10 UNIT NOTE OUTPUT Current Limit Range 0 to 5 0 to 5 0 to 10 A Short Term Stability [1,2] 0.0009 °C Measured over 1 hour Long Term Stability [1,2] 0.005 °C Measured over 24 hours SENSOR COMPATIBILITY Thermistor Voltage Range 0 to 10 V Two Wire RTD Range 100 to 1000 Ω Bias Current Range 0.01 to 10 mA Auto-ranging Bias Current Accuracy 0.008 % Bias Current Temperature Coefficient 25 ppm / ºC Linear Voltage or Current Sensors Supported Comparable to LM335 and AD590 Monitor and Limit On-Screen Resolution 0.001 °C Current Limit to Actual Output Current Accuracy 2 % Set to Actual Temperature Monitor Accuracy 0.04 % Feedback IntelliTune® PID GENERAL SPECIFICATIONS VALUE UNIT NOTE Operating Temperature 0 to 50 °C Nominal operating temperature is 25°C Storage Temperature 0 to 50 °C Maximum Operating Humidity 80 % Relative humidity at 30°C, non- condensing Warm-Up Time 1 hour Internal Over-Temperature Limit 60-70 °C Remote Interface USB Warranty One (1) Year Safety Tested To IEC 61000-3-2 IEC 61000-3-3 IEC 61000-4-2 IEC 61000-4-3 IEC 61000-4-4 IEC 61000-4-5 IEC 61000-4-6 IEC 61000-4-8 IEC 61010-1 EN61010-2-30 EN61326-1 European Council Directive 2004/108/EC & European Council Directive 2006/95/EC Size 3.91 × 8.86 × 17.75 in (mm) Weight 9.26 (4.2) lbs (kg) POWER SUPPLY REQUIREMENTS VALUE NOTE AC Power Supply and Line Frequency 100-240 VAC (±10%)

3 A, 50-60 Hz

Fuse for 100-240 V 3.15 A 250 AC Fast Blow (3.15 AH 250 V 5 × 20 mm) Replacement fuse: Littelfuse 02163.15 HXP Maximum AC Line Power 200 W [1] This specification assumes a steady-state operation with a tuned system using a 10 kΩ thermistor. Typical Stability achieved by measuring 3 standard deviations (3σ) away from the mean over the specified time period. For more detail, see TN-TC02: How is Temperature Stability Measured?. Stability typical for a 14 pin butterfly package laser diode with a 10 kΩ thermistor. [2] When using resistive heaters, stability can only be consistently achieved when setpoint temperatures are 10°C or more above ambient. Stability will vary with different load types, thermal designs, and sensors. RTDs and linear voltage and current sensors are much less sensitive than thermistors to temperature change, so stability results will not match these specifications. See TN-TC01: Optimizing Thermoelectric Temperature Control Systems for maximizing system performance. ELECTRICAL SPECIFICATIONS CONTINUED

The LDTC LAB Series combine a precision temperature controller and a low-noise laser diode driver in one instrument. The temperature controller delivers bidirectional current to Peltier Effect thermoelectric coolers (TEC), or unidirectional current to resistive heaters (RH)[1]. The laser driver operates in either constant current or constant power mode, maintaining very stable current to the laser. The fundamental operating principle of the temperature controller is that the controller adjusts the output drive current in order to change the temperature of the sensor that is connected to the thermal load. The goal is to make the sensor temperature match the setpoint temperature, and then keep them equal in spite of changes to ambient conditions and variations in thermal load. The laser driver operates on similar principles, attempting to match the actual laser (or photodiode) current to the user- defined setpoint, adjusting as required. While output is enabled, the controller continuously compares the setpoint laser current and the actual current. If there is a difference between the setpoint and actual, the controller adjusts the output current until the difference is zero. The controller includes features that help protect the load from damage, and also make it more versatile in a wide array of applications.

  • Current Limits: The adjustable current limits must be set correctly in order to avoid over-driving and damaging the TE/heater and laser.
  • Voltage Limit: The voltage to the TEC can be limited through remote commands and the voltage to the laser can be limited on screen.
  • Temperature Limits: Set high and low temperature limits to protect the laser. If temperature limits are exceeded, TE current will be disabled. Optionally, LD current can be configured to disable as well.
  • Temperature Control Loop: The temperature controller employs a smart Proportional-Integral-Derivative (PID) control loop to adjust the drive current. The terms are user- adjustable and, when properly configured, will quickly settle the load temperature with minimal overshoot and ringing.
  • IntelliTune: Wavelength’s proprietary algorithm characterizes the TEC/Sensor system’s response to the LDTC LAB and determines the optimal PID control coefficients. Then, it automatically adjusts the PID values as setpoint, tuning mode, or bias current are changed.
  • Disconnect/Failure Protection: If a short or open circuit is detected at the temperature sensor, thermoelectric, or laser, the respective output current is disabled. [1] The LDTC LAB does not support packages where the TEC/RH is connected to the laser case. INSTRUMENT OVERVIEW WHAT’S IN THE BOX
  • LDTC LAB: Combination Laser Driver and Temperature Controller Instrument
  • Power Cable, type appropriate for final location
  • 15+2 Male D-SUB plug and pins for TC connection
  • 15-pin Male D-SUB plug and pins for connection to Type A laser diodes (passive interlock jumper installed)
  • 15-pin Female D-SUB receptacle and pins for connection to Type C laser diodes (passive interlock jumper installed)
  • 50 Ω BNC Terminator for Active Lock BNC
  • Two 3.15 A fuses are installed in the red fuse tray in the power entry module on the back panel
  • Keys for the key switch REQUIRED AND OPTIONAL EQUIPMENT FOR SET UP
  • Optional test loads with appropriate heatsinking (both laser and thermoelectric) OR
  • Thermoelectric/Resistive Heater with temperature sensor for feedback, and laser diode COMPUTER REQUIREMENTS FOR REMOTE OPERATION ONLY (OPTIONAL) Operating System: Windows Vista SP2 or later Note: See page 13 for Remote Operation ESD INFORMATION Before proceeding, it is critical that you take precautions to prevent electrostatic discharge (ESD) damage to the laser diode. ESD damage can result from improper handling of sensitive electronics, and is easily preventable with simple precautions. For more information regarding ESD, see Application Note AN-LDTC06: Basics: Electrostatic Discharge (ESD). We recommend that you always observe ESD precautions when operating the LDTC LAB.

3.15 A, 50-60 Hz

Figure 9. Rear Panel Table 3. Rear Panel Functions 1 Fan Vent Do not block air flow. 2 Chassis Ground Physical connection to chassis and electrical earth ground.

3 Laser Diode Out & Sensor

(Type A/B) Laser diode connector and sensor input: 15-pin female D-SUB connector.

4 Laser Diode Out & Sensor

(Type C) Laser diode connector and sensor input: 15-pin male D-SUB connector. 5 External Modulation BNC connection for laser diode modulation. 6 Fuse Box Removable fuse drawer. 7 AC Power Switch AC power switch that powers the instrument. 8 AC Power Connector IEC AC line input, IEC60320. 9 USB USB port, connection between instrument and a computer. 10 Laser Enable Interlock BNC connection for active interlock. 11 TE Out & Sensors Thermoelectric connector and sensor input: 15-pin (plus two) female D-SUB connnector.

Figure 10. Front Panel Table 4. Front panel Functions

1 Keylock Switch

UNLOCK allows laser output current to flow. LOCK disables output current. Note: The key can only be removed when in the LOCK position. 2 Touchscreen Display Main user interface. Use this to switch between laser and temperature control settings. 3 Adjustment Knob Turn to adjust the numeric values. Instrument beeps when values are set. 4 TC Enable Button Allows instrument to deliver current to the thermoelectric load. Glows blue when current is enabled. 5 LDD Enable Button Allows instrument to deliver current to the laser. Glows red when current is enabled. Text color indicates current state. White, Green Uneditable field, for information only. either the touchscreen or adjustment knob. made, touch again to cancel selection. Icon color indicates current state. Grey Screen is inactive, touch to access screen. LAB are brighter when compared to those of revisions A-D. improved overall user experience.

dictate whether or not output current is enabled. current to be output to the laser. disable, and the LED will become dark. Press to access the Dual Monitor Screen. Figure 21. Dual Monitor Screen within the defined tolerance, the target icon will be visible. Function (specified on the Photodiode Screen) is zero (OFF). configured, output current to the LD and/or TC will be disabled. Linked Operation" on page 27 for more information.

  • Load Open/Short: » The instrument will detect if there are open or shorted conditions across either the LD or the TC connections. The TC portion of the instrument will continue to operate if the laser portion malfunctions. Whether or not the LD portion of the instrument continues to operate if the TC portion malfunctions can be set by the user via remote commands.
  • Over- or Under-Temperature: » If the temperature limits that are set by the user are exceeded (either high or low), current to the thermoelectric will be disabled. Current to the laser can be disabled via remote commands.
  • Over- or Under-Voltage: » The LDTC LAB monitors the power supply voltages and triggers an error and shuts off the output if the internal power supplies are out of a pre-determined range.
  1. Press to access the TC Control Screen.
  2. Press the Setpoint temperature value and

Figure 32. TC Control Screen press the mode to cycle through the options.

  1. Disable all output current.
  2. On the TC Control Screen, ensure either
  • Setpoint Response: This setting has a fast time to temperature and will overshoot.
  • Disturbance Rejection: This setting has a quick return to setpoint after stability is reached. It is best for pulsing lasers or active loads, or if ambient temperature fluctuates.
  • Manual Tuning: Turns IntelliTune off. 3. On the TC Limits screen, set Max/Min Temperature Limits. 4. Adjust the setpoint off ambient temperature by about 5ºC. 5. Make sure the setpoint will not cause a sensor bias current change by choosing a setpoint between 0.075 to 10 V. The scan is completed at a single bias current level. For 10 kΩ thermistors the troublesome temperatures are around -21ºC and 32ºC. For 50 kΩ thermistors, the troublesome temperatures are around 11ºC and 71ºC. 7. Press to start a characterization scan. NOTES:
  • The process takes three sweeps and can take several minutes. The “note” icon fills with red to indicate a scan is in progress. If any portion of the icon is red and you want to stop the process, press the “note” icon to abort the session. If the session is aborted, the PID coefficients revert to the previously used coefficients.
  • When the characterization process is complete, the new PID coefficients display and the icon reverts to green.
  • Tune only in temperature mode. Sensor Raw mode is not supported.
  • When IntelliTune is running, the following controls are disabled: Bias Current Selection, Sensor Selection, Heating Current Limit, Cooling Current Limit, TEC Limit Voltage, Temperature Setpoint, Proportional Gain, Integrator Time Constant, Differentiator Time Constant, IntelliTune Mode.

tuning mode is set to Manual Tuning. 10% of the initial values. The limit icon glows red frequently. Current limits are restored after the scan is complete. Autotune for an in-depth exploration of IntelliTune. Figure 33. TE OUT/SENSOR 15+2-pin D-SUB

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

polarity. The polarity can be changed by remote command. is within the window defined by setpoint ± tolerance. across the thermoelectric and load. Control Screen (see Figure 35) is not active.

  1. Press to access the LD Limit Screen.
  2. Press LD Limit Current, Maximum Laser

value. The instrument will beep when set. at the limit. It will not disable output if the limit is reached. Figure 34. LD Limit Screen

  • 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.

current to the laser. Once enabled, the button will glow red. remote commands, see ONDELAY or LASer:ONDELAY). oscilloscope across the laser or in series with it. Table 5. Model-dependent external modulation transfer

  1. Connect the Analog Output Current Monitor (Pin 10) on

the LDD/MONITOR D-SUB to an oscilloscope.

  1. Connect Analog Monitor Ground (Pin 12) to oscilloscope
  2. Measure the voltage on the Analog Setpoint Monitor
  3. Ground for the measurement is the Analog Monitor

LD current setpoint is calculated after output is enabled. Table 6. Analog current and setpoint monitor transfer functions. The range is 0-5 V where 5 V is full scale current. disable the output regardless of the front panel enable button. is required for front panel operation with the default polarity. The polarity can be changed by remote command.

PROBLEM POTENTIAL CAUSES SOLUTIONS The LDD output switched off unexpectedly OR I can't enable LDD output current The output disabled due to an interlock. Check error messages on screen or with ERR? query Fix appropriate interlock or follow instructions on Error Messages Page. TC failure detected. If the TC output also disabled, resolve the source of that error. If LDD output was remotely linked to the TC status, but you don't want it to be linked, use LASer:ENABle:OUTOFF command to unlink them. Temperature limits have been reached. If the temperature limits can be increased without damage, increase the temperature limit settings. The TC output switched off unexpectedly OR I can't enable TC output current. Check error messages on screen or with ERR? query, OR TC failure was detected. The instrument detected an error. Follow instructions on Error Messages Page. Temperature limits have been reached. If the temperature limits can be increased without damage, increase the temperature limit settings. The instrument is on but the front panel display is blank. Instrument firmware is being downloaded from USB port. Wait patiently until the firmware has finished updating. The screen brightness is too low. While the screen may appear off, the brightness is at a low setting. Go to the settings screen to raise the brightness or send remote command (BRIGHT) to increase brightness. If you can't see the screen because it is too dark and don't want to easily use the remote command, imagine the location of the icons on the screen. Good luck. LD noise current is higher than expected. Ground Loop, bad connections and solder joints, noisy computer connections, etc. Refer to AN-LD09 Troubleshooting Low Noise Systems. Actual LD current does not match the setpoint. The setpoint exceeds the limit current setting. If the limit current can be increased without damage to the laser, increase the limit current setting. The laser is compliance voltage limited. If the limit voltage can be increased without damage to the laser, increase the limit voltage setting. See Additional Technical Information for more details. Temperature does not stabilize very well at setpoint. Poor thermal contact between components of the thermal load. Use thermal paste or washers between the load/TEC and TEC/heatsink interfaces. Make sure the temperature sensor is in good thermal contact with the load. Operating outside of the ideal region of the temperature sensor. The sensor type and bias current should be selected to maximize sensitivity at the target temperature. Thermistors provide the best performance, particularly for applications where a single setpoint temperature must be accurately maintained. For example, at 25°C a 10 kΩ thermistor has a sensitivity of 43 mV/°C, whereas an RTD sensor has a sensitivity of 4 mV/°C. Proportional control term is set too high. Run an IntelliTune scan. Derivative term is introducing noise. Run an IntelliTune scan. Sensor bias current was changed while instrument was in Manual IntelliTune mode. In Manual mode, IntelliTune changes are not made when bias current or setpoint is changed. Change to either SR or DR mode for IntelliTune to update.

PROBLEM POTENTIAL CAUSES SOLUTIONS Using a resistive heater, temperature is slow to stabilize and is not within the specifications. Setpoint temperature is set too close to the ambient temperature. Set the temperature at least 10°C above ambient when using a resistive heater. A resistive heater is unable to precisely maintain temperatures near ambient because once the temperature overshoots the setpoint, the controller turns off and relies on ambient temperature to cool the load. If setting the temperature 10°C or more above ambient is not possible, then choose a thermoelectric, which can alternately heat and cool the load to maintain a more precise setpoint temperature. Airflow across load is inadequate. Use a fan to blow air across the load to increase natural convection. Temperature does not reach the setpoint. Insufficient current driven to the TEC or heater. Increase the current limit, but DO NOT exceed the specifications of the TEC/RH. The controller does not have sufficient compliance voltage to drive the TEC or heater Check the thermoelectric voltage and determine if it is too close to the 15 V maximum. If it is, choose a lower voltage thermoelectric. Temperature differential may be too great. Check TEC TMAX. What is heatsink temperature minus T? Temperature increases beyond the setpoint and will not come down. The TEC and heatsink are not adequately sized for the thermal load. The system is in "thermal runaway." The heat being generated by the load may be too great for the TEC to pump to the heatsink; a larger TEC or heatsink, or airflow may be needed. Consult Technical Note TN-TC01: Optimizing Thermoelectric Temperature Control Systems. Actual temperature does not approach setpoint after output current is enabled. Thermoelectric wiring is reversed. Reverse the leads to the thermoelectric. The thermoelectric is generating too much heat and has inadequate cooling. Install a larger heatsink or a fan to cool the heatsink. I hear a beep and know there is an error, but nothing is displayed on the instrument screen. A remote command REMERR 1 needs to be sent to the instrument to display errors. Connect the LDTC LAB to a remote computer and write the REMERR 1 command. See the Remote Command set document for more information. My instrument doesn't show up in the list. (REMOTE ONLY) Instrument may not be turned on. Power up the instrument and click Refresh on the Choose Instrument window. Your instrument may not be plugged into the computer. Check that a USB cable is tightly connected to the instrument and to the computer. IntelliTune fails because of a sensor error. Sensor voltage may be too high or too low, which triggers a bias current change. Choose a setpoint such that the sensor voltage will be between 0.075 V and 10 V. The sensor signal will be in range during all of the sweeps and not trigger a bias current change. Select a fixed bias current. Review the TCS Series Thermistors Datasheet for temperature-resistance-voltage relationships. IntelliTune fails because of a "load short" error. The load compliance voltage is too low Put a resistor in series with the thermoelectric to increase the load compliance voltage. Decrease Cable Resistance. Can't clear an on-screen error message. The cause of the error may not have been fixed. Clear the error on screen. If the cause of the error is not corrected, the error message is displayed again. IntelliTune gives me different answers when I run a scan. System has not reached thermal equilibrium. The characteristics of the load will change from initial start with all parts at room temperature to when parts are at desired operating temperatures. Run IntelliTune once all elements of the system have reached operating temperature.

ERROR POTENTIAL CAUSES SOLUTION Laser output disabled due to key switch Key switch not properly configured. Ensure the key switch is in the unlocked position for output current to flow. Laser output disabled due to BNC interlock No connection made at the rear panel ACTIVE LOCK. Either the provided BNC terminator, or a user interlock connection must be made to the ACTIVE LOCK at the rear panel for output current to flow. Laser output disabled due to D-SUB interlock Passive interlock pins not shorted at the LD D-SUB. Ensure the interlock pins (Pins 2 & 3) on the LD D-SUB are shorted together. TC output turned off due to sensor short Sensor connections are shorted. Ensure the chosen sensor is properly wired. TC output turned off due to sensor open Sensor is wired to the wrong pins. Ensure the chosen sensor is properly wired. TEC Load open No thermoelectric is present. Ensure the thermoelectric is properly wired. TEC Load short Thermoelectric connections are shorted together. Ensure the thermoelectric is properly wired. Internal overtemp condition The ambient air temperature is too high for the instrument. Reduce the ambient air temperature to 50°C or less. IntelliTune aborted User cancelled the IntelliTune scan. Change the desired settings and begin the IntelliTune scan again. Zero value TC current limit TC current limits are set to zero. Increase the TC current limits, and begin the IntelliTune scan again. Insufficient TC current limit TC current limits are too low. The instrument can't drive enough current to reach setpoint. Increase the TC current limits, and begin the IntelliTune scan again. Temperature going in the wrong direction. IntelliTune aborted. TEC polarity is reversed. Reverse the connection to TEC+ and TEC- and begin the IntelliTune scan again. Inadequate heat sinking. Load may be in thermal runaway. Increase heatsinking and/or airflow and begin the IntelliTune scan again. TC output Disabled. IntelliTune aborted. User turned TC output current off. With output current disabled, begin the IntelliTune scan again. Start IntelliTune with the TC output off. TC output current was enabled when the IntelliTune scan attempted to begin. Ensure the TC output current is disabled, and begin the IntelliTune scan again. Can't run IntelliTune in Manual Tuning mode. IntelliTune mode set to Manual Tuning. Ensure the IntelliTune mode is in either Disturbance Rejection or Setpoint Response, and begin the IntelliTune scan again. Starting actual temperature was too close to setpoint To start an IntelliTune scan, actual temperature cannot be too close to setpoint temperature. Change the setpoint at least 5°C away from ambient and begin the IntelliTune scan again. Recall OR Save Error Bad internal SD card Contact the factory Sensor change. Output current disabled. Output was enabled while changing the sensor. Disable the output current before configuring/changing the sensor. TC output disabled due to reaching upper or lower temperature limit. Temperature range limit is not large enough for system. If limits can be increased without damage to the load, increase the temperature limits. System in thermal runaway. If you see the temperature continually rising, consult Technical Note TN-TC01: Optimizing Thermoelectric Temperature Control Systems.

ERROR POTENTIAL CAUSES SOLUTION Laser disabled due to TEC output state. LD output is linked to TEC output state or TC current is not enabled Unlink the Laser output from the TC (See LASer:ENABle:OUTOFF) or enable TC current. Laser disabled due to shorted TEC. TEC load connection is either open or shorted. Unlink the Laser output from TC (see LASer:ENABle:OUTOFF) or see TEC load short/open solution above.Laser disabled due to open TEC. Laser disabled because temperature is not stable. Poor thermal contact or operating outside ideal range of sensor. Unlink the Laser output from TC (see LASer:ENABle:OUTOFF) or see troubleshooting section above. Laser disabled due to shorted temperature sensor. Temperature sensor connections are shorted together. Unlink the Laser output from TC (see LASer:ENABle:OUTOFF) or check sensor wiring. Laser disabled due to open temperature sensor. No temperature sensor is present. Unlink the Laser output from TC (see LASer:ENABle:OUTOFF) or check sensor wiring. Laser disabled because temperature is above max limit. Thermal runaway. The TEC cannot pump heat to the heatsink fast enough. Unlink the Laser output from TC (see LASer:ENABle:OUTOFF) or use larger TEC or larger heatsink or increase the limit if safe. Laser disabled because temperature is below min limit. Minimum limit is too high. Unlink the Laser output from TC (see LASer:ENABle:OUTOFF) or if safe, increase the minimum limit. To reach initial temperature, system may overshoot. Run IntelliTune in System Response mode or reduce current limit. Laser load open. No laser is present. Ensure the laser is properly wired. Laser load short. Laser connections are shorted together. Ensure the laser is properly wired. Non-uniform TEI step. Non-uniform TE I step was measured. Restart IntelliTune. IntelliTune response timeout. System response is very slow. Put sensor closer to TEC. See Technical Note TN-TC01 Optimizing Thermoelectric Temperature Control Systems. Error calculating PID terms. IntelliTune data is corrupt. Re-run IntelliTune. Not allowed while TEC output is on. Changing certain settings require the TEC output to be disabled. Disable TEC output before step. THE FOLLOWING ERRORS REQUIRE WAVELENGTH TECHNICAL SUPPORT

  • +5V power failure. Please contact the factory.
  • Laser load power supply failure. Please contact the factory.
  • Laser control power supply failure. Please contact the factory.
  • TEC load power supply failure. Please contact the factory.
  • TEC control power supply failure. Please contact the factory.
  • Hardware error. Please contact the factory.
  • Power failure. Please contact the factory.
  • Using the Max Laser Voltage Limit
  • Use Passive and Active ld Interlocks
  • Clipping LD Current Limit
  • Independent/Linked Operation USING THE MAX LASER VOLTAGE LIMIT The Maximum Laser Voltage field can be used as a safety feature, and a compliance voltage indicator. If the voltage across the laser attempts to breach the set limit, the instrument will present an error to keep the laser from operating in compliance voltage limited mode (not being able to achieve the full requested output current). USE PASSIVE AND ACTIVE LD INTERLOCKS The passive interlock is designed to trigger if Pins 2 and 3 on the LDD D-SUB are not shorted. Use this interlock with doors and enclosures that trigger an open circuit when opened. The active interlock (ACTIVE LOCK BNC) can be used with another active system component to disable/enable the LD current output. CLIPPING LD CURRENT LIMIT The LDTC LAB utilizes a clipping LD current limit. This means that at a current level very near the current limit, the instrument will clamp the output current at the limit, and continue operating at that level of output current. Output current will not be disabled if the limit is reached. INDEPENDENT/LINKED OPERATION The LDTC LAB can operate with the LD and TC sides independent of one another, or tied. If tied operation is chosen, the user can choose which TC errors will trigger a LD output current disable using the Laser Enable Output Off register (use remote command LASer:ENABle:OUTOFF ). This register is defined below, in Table 7. DECIMAL HEXADECIMAL TC CONDITION 1 0x0001 Output disabled 2 0x0002 TEC short 4 0x0004 TEC open 8 0x0008 Temperature not stable 16 0x0010 Sensor short 32 0x0020 Sensor open 64 0x0040 Over-temperature 128 0x0080 Under-temperature

Table 7. Laser Enable Output Off register definitions LAS:ENAB:OUTOFF 96 specifies this shutdown condition.

16.35 [415.3] 17.75 [450.9] 0.60 [15.2] 0.80 [20.3] 3.47 [88.1] 6.0 [152.4] 3.91 [99.3] 8.86 [225.0] 16.35 [415.3] 3.47 [88.1]3.91 [99.3] 8.86 [225.0] Dimensions in inches [mm] ±5% CABLING SPECIFICATIONS WCB407: TE/RH/SENSOR DB15+2 CABLE (NOT INCLUDED)

WCB408: LD TYPE A/B DB15 CABLE (NOT INCLUDED) WCB409: LD TYPE C DB15 CABLE (NOT INCLUDED)

WCB319: TC TO LDMOUNT (NOT INCLUDED) WCB326: TYPE A/B LASER TO LDMOUNT (NOT INCLUDED) WCB 327: TYPE C LASER TO LDMOUNT (NOT INCLUDED) 36.00" (5)BLACK (4)GREEN (3)ORANGE or BROWN (2)BLUE (9)RED (1)WHITE 15 8 9 1 VIEW LOOKING AT SOLDER CUPS 1 6 Interlock + (1)BLUE PD Cathode (2)BLACK LD Cathode (7)RED LD Anode (3)WHITE PD Anode (4)GREEN Interlock - (5)ORANGE VIEW LOOKING AT SOLDER CUPS or BROWN

WARRANTY & CERTIFICATION CERTIFICATION Wavelength Electronics, Inc. (Wavelength) certifies that this product met its published specifications at the time of shipment. Wavelength further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed by that organization’s calibration facilities, and to the calibration facilities of other International Standards Organization members. WARRANTY This Wavelength product is warranted against defects in materials and workmanship for a period of one (1) year from date of shipment. During the warranty period, Wavelength will, at its option, either repair or replace products which prove to be defective. Warranty is void if label is removed from back panel. WARRANTY SERVICE For warranty service or repair, this product must be returned to the factory. An RMA is required for products returned to Wavelength for warranty service. The Buyer shall prepay shipping charges to Wavelength and Wavelength shall pay shipping charges to return the product to the Buyer upon determination of defective materials or workmanship. However, the Buyer shall pay all shipping charges, duties, and taxes for products returned to Wavelength from another country. LIMITATIONS OF WARRANTY The warranty shall not apply to defects resulting from improper use or misuse of the product or operation outside published specifications. Warranty for the TC LAB instrument is invalid if the instrument cover has been removed for any reason. No other warranty is expressed or implied. Wavelength specifically disclaims the implied warranties of merchantability and fitness for a particular purpose. EXCLUSIVE REMEDIES The remedies provided herein are the Buyer’s sole and exclusive remedies. Wavelength shall not be liable for any direct, indirect, special, incidental, or consequential damages, whether based on contract, tort, or any other legal theory. REVERSE ENGINEERING PROHIBITED Buyer, End-User, or Third-Party Reseller are expressly prohibited from reverse engineering, decompiling, or disassembling this product. NOTICE The information contained in this document is subject to change without notice. Wavelength will not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. No part of this document may be translated to another language without the prior written consent of Wavelength. SAFETY There are no user-serviceable parts inside this product. Return the product to Wavelength Electronics for service and repair to ensure that safety features are maintained. LIFE SUPPORT POLICY This important safety information applies to all Wavelength electrical and electronic products and accessories: As a general policy, Wavelength Electronics, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the Wavelength product can be reasonably expected to cause failure of the life support device or to significantly affect its safety or effectiveness. Wavelength will not knowingly sell its products for use in such applications unless it receives written assurances satisfactory to Wavelength that the risks of injury or damage have been minimized, the customer assumes all such risks, and there is no product liability for Wavelength. Examples of devices considered to be life support devices are: neonatal oxygen analyzers, nerve stimulators (for any use), auto-transfusion devices, blood pumps, defibrillators, arrhythmia detectors and alarms, pacemakers, hemodialysis systems, peritoneal dialysis systems, ventilators of all types, and infusion pumps as well as other devices designated as “critical” by the FDA. The above are representative examples only and are not intended to be conclusive or exclusive of any other life support device. CALIBRATION INTERVAL The customer is responsible for determining calibration intervals; however, Wavelength Electronics recommends a calibration interval of two (2) years, beginning from the original date of manufacture. The instrument's calibration can be influenced by temperature, humidity, vibration and shock, as well as general wear over time. Extending the calibration interval can lead to operation outside of specifications and is not recommended. TECHNICAL SUPPORT & CONTACT INFORMATION WAVELEnGTH ELECTRONICS

51 Evergreen Drive

Bozeman, Montana 59715 406-587-4910 (tel) 406-587-4911 (fax) Sales & Tech Support sales@teamWavelength.com techsupport@teamWavelength.com

REVISION HISTORY

Document Number: LD2TC5-LA400 REVISION DATE NOTES B December 2023 Added Calibration Interval C March 2025 Added LD250mTC5 Product