Wavelength Electronics WTC3290-1400 Series Manual

Thermoelectric temperature controller board with display

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WTC3293-14000 Series
WTC3243 Thermoelectric Temperature
Controller Board with Display

GENERAL DESCRIPTION:

Simply stable temperature control. Wire your
thermoelectric cooler and thermistor to the
board with the cable provided.
appropriate DC power supply and indicate the
expected voltage on the jumper. With the
output disabled, adjust the on-board 12-turn
trimpot and watch the setpoint temperature
change on the 4-digit display. Switch to Actual
and display your thermistor temperature.
Watch the LED tree to see "over / under
temperature" or "stable at setpoint" status.
Enable the output current and watch the
temperature quickly lock in on the setpoint.
Online Design Tools at
www.teamwavelength.com
Figure 1
Top View
© 2005
FEATURES:
Add the
• Low noise, maximum temperature stability
commercially available
• Display thermistor temperature directly - no
tables to convert resistance to temperature
• LED indicator shows over temperature,
stable at setpoint, or under temperature
status
• Adjust setpoint with a 12-turn potentiometer
or an external voltage
• Control temperature using a 10kΩ
thermistor
• Fixed resistors set Proportional Gain,
Integrator Time Constant, and
thermoelectric current limits
• Enable/Disable Output Current Switch
• Includes Output Cable & DC Power Supply
• Works with a wide range of thermoelectrics
WTC3293-14400-A Rev E
August, 2005
WTC3243 INCLUDED
www.teamwavelength.com

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Summary of Contents for Wavelength Electronics WTC3290-1400 Series

  • Page 1 August, 2005 WTC3293-14000 Series WTC3243 Thermoelectric Temperature Controller Board with Display GENERAL DESCRIPTION: WTC3243 INCLUDED Simply stable temperature control. Wire your thermoelectric cooler and thermistor to the FEATURES: board with the cable provided. Add the • Low noise, maximum temperature stability appropriate DC power supply and indicate the commercially available expected voltage on the jumper.
  • Page 2 PAGE 2 Quick Reference: CONFIGURATION The display is calibrated for a specifi c 10 kohm thermistor, the TCS610: 1/T = A + B(ln R) + C(ln R) where T is in Kelvin; R is in ohms, A = 1.1279E-3; B=2.3429E-4; C=8.7298E-8 Bias Current is also chosen for this thermistor: 100µA Fuse: For safety, a 3A fuse is included on the board.
  • Page 3 PAGE 3 OPERATING THE WTC3293-14000 STEP 1: SELECT POWER SUPPLY VOLTAGE and INSTALL JUMPER This board has been designed to work with various thermoelectrics. The power supply voltage must be tailored to the resistance of the thermoelectric to keep the WTC3243 intact. You need a power supply voltage high enough to drive the thermoelectric, but not too high to overdrive the WTC3243.
  • Page 4 PAGE 4 OPERATING THE WTC3293-14000 STEP 3: SELECT PROPORTIONAL GAIN AND INTEGRAL TIME CONSTANT To optimize the control loop (minimize overshoot, settling time, avoid cycling, etc.) change the control parameters as shown below. If the load doesn’t stabilize, contact the factory for troubleshooting advice.
  • Page 5 PAGE 5 OPERATING THE WTC3293-14000 STEP 5: VIEW THE SETPOINT and ACTUAL TEMPERATURE The switch next to the setpoint potentiometer determines whether Setpoint or Actual temperature is displayed. When the setpoint is displayed, the rightmost decimal point is lit. The resistance to temperature conversion software assumes the thermistor bias current is 100µA and the thermistor is characterized by the Steinhart-Hart relationship: 1/T = A + B(ln R) + C(ln R)
  • Page 6 PAGE 6 MECHANICAL SPECIFICATIONS 0.08” 2.25” 0.36” 0.625” 1.00” 0.125” 2.25” 2.00” 0.115” 0.125” dia thru 4x Max height from top side of PCB to fan is 1.5” Standoffs are 0.625” tall Board thickness is 0.60” Allow 0.375” clearance from bottom side of PCB for airfl ow. ©...
  • Page 7 PAGE 7 CERTIFICATION AND WARRANTY CERTIFICATION: NOTICE: Wavelength Electronics (WEI) certifi es that this The information contained in this document is product met it’s published specifi cations at the subject to change without notice. Wavelength time of shipment. Wavelength further certifi es...

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