THORLABS TED4015 User manual

Temperature Controller
TED4015
Operation Manual
2017

Copyright Copyright © 2017 Thorlabs
Version:
Date:
Item No.:
3.7
06-Oct-2017
M0009-510-311

Foreword
Contents 3
1General Information 4
41.1 Safety 61.2 Protection of the TEC Element 71.3 Ordering Codes and Accessories
2Getting Started 8
82.1 Preparation 92.2 Operating Elements 112.3 First Operation 112.4 System Preferences
3Operating the TED4015 Series 13
133.1 Connecting Components 133.1.1 Pin Assignment of the TEC Output Jack 143.1.2 Connecting a TEC Element 153.1.3 Connecting a Temperature Sensor 153.1.3.1 NTC Thermistor 163.1.3.2 Current Temperature Sensors AD590 or AD592 163.1.3.3 Voltage Temperature Sensor LM35 163.1.3.4 Voltage Temperature Sensors LM335, LM235 or LM135 163.1.3.5 Platinum RTD Temperature Sensors PT100 or PT1000 173.1.4 Setting up the TEC Voltage Measurement 173.1.5 Connecting Interlock and TEC ON Monitoring 183.1.6 TEC control outputs 193.2 Power-up 203.3 TEC Source Setup 213.4 Temperature Sensor Setup 233.5 Thermistor Settings 243.6 PID Control Loop 283.7 PID Auto Tune 303.8 Temperature Protection 313.9 Display Configuration 323.10Settings Memories 343.11Digital I/O ports 373.12Systems Preferences 373.13Remote Control 373.14Information
4Computer interface 38
384.1 Using the USB Iinterface

394.2 Instrument Driver Installation 404.3 Firmware Update
5Maintenance and Repair 41
415.1 General Remarks 415.2 Line Voltage Settings 425.3 Replacing the Mains Fuses 435.4 Troubleshooting
6 Appendix 44
446.1 Technical Data 476.2 Setup and Function of a Temperature Controller 496.3 PID Controller Theory 506.4 Menu Structure Overview 516.5 Factory Settings for Thorlabs TED4015 Controllers 526.6 Error Messages 526.6.1 LED Status Messages 526.6.2 Status Indicators 536.6.3 Instrument Errors 556.7 Certifications and Compliances 566.8 Warranty 576.9 Exclusion of Reliability and Copyright 586.10Thorlabs "End of Life" Policy (WEEE) 596.11List of Acronyms 606.12Thorlabs Worldwide Contacts

Copyright © 2017 Thorlabs
We aim to develop and produce the best solution for your application
in the field of optical measurement technique. To help us to live up to
your expectations and improve our products permanently we need
your ideas and suggestions. Therefore, please let us know about
possible criticism or ideas. We and our international partners are
looking forward to hearing from you.
Thorlabs GmbH
Warning
Sections marked by this symbol explain dangers that might result in
personal injury or death. Always read the associated information
carefully, before performing the indicated procedure.
Please read these advices carefully!
This manual also contains "NOTES" and "HINTS" written in this form.
Attention
Paragraphs preceeded by this symbol explain hazards that could
damage the instrument and the connected equipment or may cause
loss of data.
Note
3

Copyright © 2017 Thorlabs4
TED4015
1 General Information
This part of the operation manual contains specific information on how to operate a TED4015
Temperature Controller. A general description is followed by explanations of how to operate the
unit manually. The instrument provides a USB 2.0 Full Speed interface according to the
USB 2.0 specification, the USBTMC specification and the USBTMC USB488 specification.
The TED4015 is a high power precision temperature controller for laser diodes and detectors.
Special highlights of the TED4015 Temperature Controllers are:
· Wide range of supported temperature sensors (Thermistors, PT100, PT1000, AD590,
AD592, LM35, LM135, LM235, LM335)
· TEC elements can be operated in constant temperature as well as in constant current
mode.
· Adjustable temperature window protection
· PID Auto-Tune algorithms for automatic PID control loop settings
· Manual tuning of PID control loop settings
· Selectable temperature unit (°C, °F and Kelvin)
· Temperature loop monitoring for laser protection
· A wide variety of protection features safeguard the TEC element from damage.
· USB interface for remote operation supporting the USBTMC protocol
· SCPI compliant command set
· VXIpnp Instrument Drivers for various programming environments including NI-
LabVIEW™, NI-LabWindows™/CVI and MS-Visual Studio
· Power efficient by active power management
Related documents:
· LDC4000 Series Operation Manual available at www.thorlabs.com
· ITC4000 Series Operation Manual available at www.thorlabs.com
· Series 4000 Programmers Reference Manual at www.thorlabs.com
1.1 Safety
Attention
The safety of any system incorporating the equipment is the responsibility of the assem-
bler of the system.
All statements regarding safety of operation and technical data in this instruction manual
will only apply when the unit is operated correctly as it was designed for.
The TED4015 must not be operated in explosion endangered environments!
Do not obstruct the air ventilation slots in the housing!
Do not remove covers!
Do not open the cabinet.There are no parts serviceable by the operator inside!
This precision device is only serviceable if properly packed into the complete original
packaging including the plastic foam sleeves. If necessary, ask for replacement pack-
aging.
Refer servicing to qualified personnel!
Only with written consent from Thorlabs may changes to single components be made or
components not supplied by Thorlabs be used.

Copyright © 2017 Thorlabs
1 General Information
5
Attention
Prior to applying power to the TED4015, make sure that the protective conductor of the 3
conductor mains power cord is correctly connected to the protective earth ground con-
tact of the socket outlet! Improper grounding can cause electric shock resulting in dam-
age to your health or even death!
Ensure that the line voltage setting of the fuse holder at the rear panel agrees with your
local supply and that the corresponding fuses are inserted. If not, please change the line
voltage setting (see section Line voltage settings) and the mains fuses (see section Re-
placing the Mains Fuses).
To avoid risk of fire, only the appropriate fuses for the corresponding line voltage must
be used.
All modules must only be operated with duly shielded connection cables.
Attention
The following statement applies to the products covered in this manual, unless other-
wise specified herein. The statement for other products will appear in the respective ac-
companying documentation.
Note: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules and meets all requirements of the
Canadian Interference-Causing Equipment Standard ICES-003 for digital apparatus.
These limits are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generates, uses, and can radiate radio fre-
quency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee
that interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by turning
the equipment off and on, the user is encouraged to try to correct the interference by one
or more of the following measures:
· Reorient or relocate the receiving antenna.
· Increase the separation between the equipment and receiver.
· Connect the equipment into an outlet on a circuit different from that to which the re-
ceiver is connected.
· Consult the dealer or an experienced radio/T.V. technician for help.
Users that change or modify the product described in this manual in a way not expressly
approved by Thorlabs (party responsible for compliance) could void the user’s authority
to operate the equipment.
Thorlabs GmbH is not responsible for any radio television interference caused by modi-
fications of this equipment or the substitution or attachment of connecting cables and
equipment other than those specified by Thorlabs. The correction of interference caused
by such unauthorized modification, substitution or attachment will be the responsibility
of the user.
The use of shielded I/O cables is required when connecting this equipment to any and all
optional peripheral or host devices. Failure to do so may violate FCC and ICES rules.
Attention
Mobile telephones, cellular phones or other radio transmitters are not to be used within
the range of three meters of this unit since the electromagnetic field intensity may then
exceed the maximum allowed disturbance values according to IEC 61326-1.

Copyright © 2017 Thorlabs6
TED4015
This product has been tested and found to comply with the limits according to
IEC 61326-1 for using connection cables shorter than 3 meters (9.8 feet).
Vous pouvez trouver les traductions françaises des paragraphes ayant trait à la sécurité
d'utilisation de ce produit sur le lien suivant:
https://www.thorlabs.com/_sd.cfm?fileName=18861-D04.pdf&partNumber=TED4015
En outre, vous pouvez soit scanner le QR code, soit vous référer à la section "Docu-
ments" sur la page web du produit.
1.2 Protection of the TEC Element
To protect the connected TEC element (Peltier element) the TED4015 Temperature Controller
includes the following protective circuits:
Limit of the TEC current in all operating modes
Protection against thermal destruction.
Sensor fault detection
Protection against use of incorrect temperature sensors / protection against line interruption of
the temperature sensor.
Contact protection of the TEC element (open circuit)
Protection against cable damage, bad contact or too high TEC element resistance.
Control LED for TEC current ON
Protection against accidental turning off the TEC output.
Over-temperature protection
Protection against malfunction caused by internal overheating of the controller.
Defined states after switch-on
When switching on the TED4015 Temperature Controller with the mains switch the output is al-
ways switched off.
Mains filter
Protection against line bursts or transients.
Line failure monitoring
In case of line failure / line interruption the instrument will wake up anew as if it has been
switched on. So the output remains switched off.

Copyright © 2017 Thorlabs
1 General Information
7
1.3 Ordering Codes and Accessories
Ordering code
Short description
TED4015
Thermoelectric Temperature Controller, TEC current range 0 ... ± 15 A
CAB4000
Shielded cable to connect the TED4015 Temperature Controller to a
Thorlabs LM14S2, LDM21 or TCLDM9 Laser Diode Mount (male 17W2
mixed DSUB connector to female 9 pin DSUB connector). The rated
TEC-Current is 5A.
CAB4001
Shielded cable to connect the TED4015 Temperature Controller to a
Thorlabs High Power TEC or Laser Diode Mount (male 17W2 mixed
DSUB connector to male 17W2 mixed DSUB connector). The rated TEC-
Current is 20A.
CON4001
Connector Kit for TED4015 instruments, 20A: Mixed DSUB connector
type 17W2 (male) with two 20A high current contacts (male)
CAL-TED4000
Recalibration of a TED4015 device
Please visit our homepage www.thorlabs.com for further information.

Copyright © 2017 Thorlabs8
TED4015
2 Getting Started
Inspect the shipping container for damage.
If the shipping container appears to be damaged, keep it until you have checked the contents
and you have inspected the device mechanically and electrically.
Verify that you have received the following items:
· 1 TED4015
· 1 power cord, connector according to ordering country
· 1 USB cable (A-B) 2 m
· 1 TED4015 operation manual
· 1 Series 4000 instrumentation CD (containing manuals, drivers, tools and software)
· 1 CAB4000 shielded cable to connect the TEC controller to a Thorlabs LM14S2, LDM21
or TCLDM9 laser diode mount (male17W2 mixed DSUB connector to female 9 pin DSUB
connector), rated TEC current 5A
· 1 Connector Kit CON4001 for TED4015, rated TEC current 20A:
-1 Mixed DSUB connector type 17W2 (male) with 2 high current contacts (male)
-1 Mixed DSUB connector type 17W2 (female) with 2 high current contacts (female)
2.1 Preparation
Connect the mains connector (R9) of the unit to the line via the provided mains cable (refer to
Figure 2, chapter Operating elements at the rear panel). An external thermal setup can be con-
nected to ground potential via the connector jack of the chassis ground (R7).

Copyright © 2017 Thorlabs
2 Getting Started
9
2.2 Operating Elements
Front Panel
F1
Line switch (On/Off)
F2
LC display, 320x240 Pixel
F3
Softkeys for menu navigation
F4
ESC
Escape key
F5
ON
On/Off button for the TEC output with TEC ON LED (green) and
ERROR LED (red)
F6
Adjustment knob to change set values, push to enter

Copyright © 2017 Thorlabs10
TED4015
Rear Panel
R1
DEVIATION OUT
Temperature Deviation Output, -5 ... +5 V
R2
TEMP OK OUT
Temperature OK Output, TTL (5 V if actual temperature is
inside the temperature window)
R3
Serial number of the unit
R4
Cooling fan
R5
TEC OUTPUT
Mixed DSUB jack (17W2) for the TEC element and the tem-
perature sensors
R6
USB connector
R7
4 mm banana jack for chassis ground
R8
DIGITAL I/O
MiniDin-6 jack for 4x digital I/O, I/O supply voltage (internal
+12 V) and GND
R9
LINE IN
Mains connector and fuse holder

Copyright © 2017 Thorlabs
2 Getting Started
11
2.3 First Operation
Warning
Prior to switching on your TED4015, please read the safety instructions in chapter Safety
carefully.
Turn on the unit by means of the line switch (F1 - see section Operating elements at the front
panel).
After switching on the unit, the backlight of the display (F2) must get visible and the backlight
behind the adjustment knob (F6) must light up.
If nothing is shown on the display, please check the line voltage (see chapter Line Voltage Set-
tings) and the mains fuses (see chapter Replacing the mains fuses).
The TED4015 is immediately ready to use after turning on. The rated accuracy is reached,
however, after a warming-up time of approx. 30 minutes.
After switching on the unit, the graphics display will show the device status, followed by the
measurement screen.
By using the softkeys (F3) you can select the menu items, the set values and the measurement
values to be displayed. You can change the set values by pressing the Modify button or the ad-
justment knob and then turning the adjustment knob (F6). Push this knob or the Done key to
enter the adjusted value. If several menu items are displayed, you can select them also by turn-
ing and then pressing the adjustment knob.
If changing a parameter isn’t permitted in the actual operating mode, or you arrive at the end of
a parameter number range, entering is declined and a short beep is audible.
From any menu level, you can navigate to the next higher menu level using the ESC key (F4).
The highest level is the measurement screen.
To leave the measurement screen and to enter the menu, press the Menu key or the ESC key.
2.4 System Preferences
In the System Preferences menu you can make different settings about your TED4015 system
configuration, including Message Handling, Display Brightness, Display Contrast, Sound Sig-
nals on/off and Update Capability. To get into the System Preferences menu, turn the adjust-
ment knob or press Up / Down until System Preferences is highlighted. Confirm by pressing
Enter or the adjustment knob again.
Turn the adjustment knob or press Up / Down and select your desired menu item by pressing
the Modify key or the adjustment knob. Make your necessary changes and confirm with the
Enter key or by pressing the adjustment knob again.

Copyright © 2017 Thorlabs12
TED4015
Message Auto-Hide:
Message and error conditions which force the Laser output to switch off may disappear after a
short time. So it may be preferable to keep the error messages displayed. You can choose the
following settings:
Enabled (auto-hide): Error pop-up messages disappear after 10 seconds, you can close
them instantly by pressing the ESC button (F5).
Disabled: Messages are displayed until they will be confirmed by pressing the ESC button.
Display Brightness, Display Contrast:
Both display parameters can be changed from 0% to 100%. The brightness value also determ-
ines the illumination brightness of the adjustment knob.
Note
Please take care not to reduce the contrast value to a level making it impossible to read the dis-
play.
Sound Signals:
Here you can disable or enable the audibility of the error beeps and the menu navigation click
response.
Temperature Unit:
The preferred temperature unit can be selected: °C (Celsius), °F (Fahrenheit), and K (Kelvin).
The conversion between the units will be calculated automatically.
Line Frequency:
According to the mains properties, the line filter frequency can be set to 50 Hz or 60 Hz to sup-
press unwanted readout aliasing effects. The "Auto" function detects the line frequency auto-
matically (default setting).
Update Capability:
Firmware updates can be performed by the user via the USB interface.
Three options are available:
Enabled: Firmware can be updated at any time.
Enabled once: Firmware can be updated once, afterwards this setting changes to disabled.
Disabled: Firmware update is inhibited (default setting).
For more information please refer to section Firmware Update.

Copyright © 2017 Thorlabs
3 Operating the TED4015 Series
13
3 Operating the TED4015
3.1 Connecting Components
3.1.1 Pin Assignment of the TEC Output Jack
Pin
Connection
TEC element (Peltier element) 1)
A1
TEC element (+, when cooling)
A2
TEC element (-, when cooling) Attention: Do not connect to Ground!
2
Voltage measurement TEC element (+)
9
Voltage measurement TEC element (-)
Open circuit monitoring, status indicator, external fan
1
Interlock, TEC ON LED (+)
7
12V Output (for external fan; max. current = 500mA)
15
Ground for 12V Output and Interlock, TEC ON LED (-)
Temperature sensor
3
Thermistor (-), PT100/1000 (-), analog ground
4
Thermistor (+), PT100/1000 (+)
10
PT100/1000 (-), AD590/592 (-), LM35 out, LM135/235/335 (+)
11
PT100/1000 (+), AD590/592 (+), LM35/135/235/335 (+)
5,12
Analog ground, LM35/135/235/335 (-)
Other
14
I/O 1-wire (currently not used)
6
Digital ground for I/O 1-wire
8, 13
Not connected
1) TEC element output pins and voltage measurement input pins are "ground-free". Do not connect any of
these pins to Ground, otherwise the electronic circuit will be damaged!
Attention
The maximum TEC output current for the TED4015 series is 15A. Use only the specified
connector type: 17W2 mixed DSUB plug with high power contacts A1 and A2 rated for at
least 15A current. For wiring of A1 and A2 use only wires rated for at least 15A current.
If Thorlabs laser diode mounts like TCLDM9, LDM21, or LM14S2 are used, the easiest way to
connect them using a shielded cable CAB4000 (rated TEC current is 5A).

Copyright © 2017 Thorlabs14
TED4015
For use of other equipment, a shielded cable with two 17W2 mixed DSUB plugs, CAB4001,
(20A current rating) is also available.
When using a custom-made cable, we recommend to use a shielded cable for the sensor in-
puts with twisted pairs. Use a separate shielded cable for the TEC current and TEC voltage
measurement lines. The TEC current lines should be as short as and as close as possible to
minimize inductance.
3.1.2 Connecting a TEC Element
Attention
The TEC element output of the TED4015 is a ground-free output. Do not connect the TEC ele-
ment pins to any grounded pins (3, 5, 6, 12, 15) or to case ground, otherwise the electronic cir-
cuit will be damaged.
A TEC element connected with wrong polarity may lead to thermal runaway and damage of the
connected components.
Connect the thermoelectric cooler (TEC or Peltier element) to the high current contacts A1
(TEC+) and A2 (TEC-) of the 17W2 DSUB jack (R16, see section Operating elements at the
rear panel).
When the Temperature controller is in cooling mode, current flows from TEC+ to TEC-. This is
defined as positive current, and with the TEC element connected correctly, its active surface
(which is in contact with the tempered object) gets colder.
Check the TEC polarity as follows:
· Connect the TEC element and the temperature sensor to the 17W2 DSUB jack "TEC
OUTPUT" (R16) (Refer to section Connecting the TEC element and Connecting a temper-
ature sensor). The sensor and the TEC element must be in good thermal contact to the
thermal load. The use of thermal conducting grease is recommended. Please refer to sec-
tion Setup and function of a temperature controller.
· Turn on the TED4015.
· Select the appropriate sensor type by pressing Menu. Scroll to Temperature Sensor
Setup by turning the adjustment knob. Switch into the the Temperature Settings by press-
ing the Enter button or the adjustment knob (F8) and select the appropriate sensor:
Menu / Temperature Sensor Setup / Temperature Sensor. Confirm by pressing Done or
the adjustment knob (F8) again.
· Adjust a suitable current limit for the TEC element by selecting Menu / Temperature
Source Setup / Current Limit. Confirm by pressing Done or the adjustment knob (F8).
(refer to section Setting the TEC source parameters).
· Switch the display back to the measurement screen and set the desired temperature by
pressing and turning the adjustment knob (F8). Confirm the entered value by pressing the
adjustment knob.
· Switch on the TED4015 TEC output current by pressing the key TEC ON (F6). The green
LED in TEC ON key (F6) lights up (see section Operating elements at the front panel). If
the green LED in TEC ON key is flashing, the current temperature is out of the tempera-
ture window.
If the TEC module is connected with correct polarity, the difference between the temperature
set point and the actual temperature will decrease. Provided that the control loop parameters
are set properly (refer to section PID control loop), the actual temperature should be in accor-
dance with the temperature set point rather quickly.
If the TEC module is connected with reversed polarity, the difference between the temperature
set point and the actual temperature will increase continuously. In this case, switch off the TEC
current by pressing key "TEC ON" (F6) and correct the TEC module wiring.

Copyright © 2017 Thorlabs
3 Operating the TED4015 Series
15
3.1.3 Connecting a Temperature Sensor
The temperature controller in the TED4015 can be used with the following temperature
sensors: NTC thermistor, AD590, AD592, LM35, LM335, LM235, LM135, PT100, and PT1000.
The setting and measurement range of thermistors is 100 Ω to 100 kΩ (Low range) and 1 kΩ to
1 MΩ (High range). The displayed temperature of the used thermistor and the temperature set
point range are dependent on the sensor parameters.
If one of the other sensor types is used, the measurement range is -55°C to +150°C.
The actual control range and the accuracy of the displayed temperature depend on the operat-
ing range and the tolerance of the used sensor, and on the individual thermal setup.
The temperature sensor is connected to the 17W2 DSUB jack "TEC OUTPUT" (R16, Operating
elements at the rear panel). The wiring depends on the used sensor type.
Attention
Do not connect any sensor pin to the TEC element pins A1 or A2, otherwise the connected
components may be damaged!
3.1.3.1 NTC Thermistor
Connecting a
thermistor
The thermistor is connected between pin 3 and pin 4 of the 17W2 mixed DSUB
jack (R16, Operating elements at the rear panel). The polarity is unimportant if the
thermistor is ungrounded. If one pin of the thermistor is grounded (for example in a
laser module), this pin must be connected to pin 3.
With a thermistor as temperature sensor, the resistance can be converted into the
temperature by using the Exponential or the Steinhart-Hart calculation method.
Using the exponential method, the relation between temperature and NTC ther-
mistor resistance (and vice versa) is approximated by the formulas:
with: R0- Thermistor nominal resistance at temperature T0
T0- Nominal temperature (usually 298.15 K = 25° C)
β - Thermistor constant (sensitivity index, B value)
T - temperature in K (Kelvin)
For R0, T0and β please refer to the data sheet of the thermistor.
Using linearization series resistors, the thermistor measurement circuit of the instrument is op-
timized for best resolution with R0= 10 k W (Low Range) and R0= 100 k W (High Range). Ther-
mistors with other R0values can be used at the expense of a degraded resolution, depending
on the actual sensor resistance.
If the exponential method parameters given in the thermistor data sheet are stored in the
TED4015 setup, the thermistor temperature can be shown on the display.
A further way of approximating the relation between temperature and thermistor resistance is
the method according to Steinhart-Hart, described by the formula

Copyright © 2017 Thorlabs16
TED4015
with the Steinhart-Hart parameters A, B and C; T - temperature in K. To select the calculation
method and to enter the thermistor parameters, please refer to section Thermistor settings.
3.1.3.2 Current Temperature Sensors AD590 or AD592
If a temperature/current transducer AD590 or AD592 is used as temper-
ature sensor, it has to be connected to pin 10 (-) and pin 11 (+) of the
17W2 mixed DSUB jack "TEC OUTPUT" (R16, Operating elements at
the rear panel) at the rear of the unit.
3.1.3.3 Voltage Temperature Sensor LM35
If the temperature/voltage transducer LM35 is used as temperature
sensor, it must be connected to pin 10 (out), pin 11 (+) and pin 12 (-)
of the 17W2 mixed DSUB jack "TEC OUTPUT" (R16, Operating ele-
ments at the rear panel) at the rear of the unit.
3.1.3.4 Voltage Temperature Sensors LM335, LM235 or LM135
If the temperature/voltage transducer LM135, LM235 or LM335 is
used as temperature sensor, it has to be connected to pin 10 (+),
pin 11 (also +) and pin 12 (-) of the 17W2 mixed DSUB jack "TEC
OUTPUT" (R16, Operating elements at the rear panel) at the rear
of the unit.
3.1.3.5 Platinum RTD Temperature Sensors PT100 or PT1000
Pin 3 and 4 of the DSUB Connector are the current source, Pin
10 and 11 are the voltage measurement pins for the 4-wire
measurement setup.
One connector of the sensor has to be connected to pin 4 and 11
and the other to pin 3 and 10 of the 17W2 mixed DSUB jack
"TEC OUTPUT" (R16, Operating elements at the rear panel) at
the rear of the unit.
For optimum performance, use a separate wire for each pin of
the DSUB connector and connect the corresponding wires only at
the PT100 or PT1000, as close as possible to the sensor (see Figure 13).

Copyright © 2017 Thorlabs
3 Operating the TED4015 Series
17
3.1.4 Setting up the TEC Voltage Measurement
TEC voltage four terminal measurement
If the voltage of the TEC element shall be measured and dis-
played with enhanced accuracy, two additional cables must
be connected directly from the two poles of the TEC element
to pin 2 and 9 of the TEC OUTPUT jack (four terminal meas-
urement, see figure to the left).
If pin 2 and pin 9 are left unconnected, the TEC voltage is
measured internally at the contacts A1 and A2 of the TEC out-
put jack (two terminal measurement). This leads to a meas-
urement error due to the voltage drop along the lines to the
TEC element, so a slightly increased voltage will be displayed.
3.1.5 Connecting Interlock and TEC ON Monitoring
Pin 1 and pin 15 of the "TEC OUTPUT" jack (R16) are test contacts to determine whether a
TEC setup is connected or the connection has been interrupted. These pins must be connected
externally by a wire (total resistance <430 W ). When this “interlock” connection is opened, the
TED4015 switches off the TEC output current automatically. If the TEC output was off, it cannot
be switched on and an error message “TEC cable connection fault” appears.
If a LED with a 1 k W parallel resistor is connected between pin 1 and pin 15 as shown in Figure
15, the interlock connection is interpreted as closed, too. The LED lights up when the TEC cur-
rent output is switched on (TEC ON mode).
Note
The TED4015 Controllers don't support the “TEC lockout” feature of the Thorlabs laser diode
mounts. These mounts usually have an on-board jumper to bypass the TEC lockout function.
For details please refer to the operating manual of the laser diode mount.

Copyright © 2017 Thorlabs18
TED4015
3.1.6 TEC control outputs
Temperature OK output
This output (R15, see section Operating elements at the rear panel) provides a TTL signal (+5
V), which gets low (0 V) when the window protection is active. Please refer to section Tempera-
ture protection.
This jack can be used to monitor the temperature of a laser diode when using a Thorlabs
LDC200C series laser driver. Simply connect the corresponding plug of the laser driver to this
output of the TED4015. The laser will be switched off if the laser temperature moves out of the
temperature window. Further details can be found in the operation manual of the respective
laser driver.
Analog temperature deviation output
A temperature output "DEVIATION OUT" (R14, see section Operating elements at the rear
panel) is provided at the rear of the unit. At this jack, a voltage proportional to the actual tem-
perature deviation, scaled to the adjusted temperature window is applied for monitoring pur-
poses, e.g. to watch the settling behavior of the temperature control loop by means of an oscil-
loscope. The voltage ranges from -5 V to +5 V. The voltage formula is:
Example:
If the temperature set point is 25 °C and the temperature window is set to 2 °C, an actual tem-
perature of
23 °C leads to -5 V at the output
25 °C leads to 0 V at the output
27 °C leads to +5 V at the output
(please refer to section Temperature protection).
The temperature deviation output "DEVIATION OUT" is grounded. Thus standard measure-
ment equipment can be connected directly. Devices connected to this output should have an in-
put resistance >10 k W .