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ILX Lightwave LDT-5525 User Manual

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User's Guide
Temperature Controller
LDT-5525
ILX Lightwave Corporation P. O. Box 6310 Bozeman, MT, U.S.A. 59771
·
·
·
U.S. & Canada
:
1-800-459-9459 ·
International
Inquiries: 406-586-1244 Fax 406-586-9405
·
E-mail: support@ilxlightwave.com
www.ilxlightwave.com
70019904_7/01

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Summary of Contents for ILX Lightwave LDT-5525

  • Page 1 User’s Guide Temperature Controller LDT-5525 ILX Lightwave Corporation P. O. Box 6310 Bozeman, MT, U.S.A. 59771 · · · U.S. & Canada 1-800-459-9459 · International Inquiries: 406-586-1244 Fax 406-586-9405 · E-mail: support@ilxlightwave.com www.ilxlightwave.com 70019904_7/01...

  • Page 3: General Safety Considerations

    • Prolonged storage under adverse conditions • Failure to perform intended measurements or functions If necessary, return the instrument to ILX Lightwave, or authorized local ILX Lightwave distributor, for service or repair to ensure that safety features are maintained. All instruments returned to ILX Lightwave are required to have a Return Authorization Number assigned by an official representative of ILX Lightwave Corporation.
  • Page 4 Technical specifications including electrical ratings and weight are included within the manual. See the Table of Contents to locate the specifications and other product information. The following classifications are standard across all ILX Lightwave products: • Indoor use only • Ordinary Protection: This product is NOT protected against the harmful ingress of moisture.
  • Page 5 Returning an Instrument If an instrument is to be shipped to ILX Lightwave for repair or service, be sure to: Obtain a Return Authorization number (RA) from ILX Customer Service. Attach a tag to the instrument identifying the owner and indicating the required service or repair.
  • Page 6 Comments, Suggestions, and Problems To ensure that you get the most out of your ILX Lightwave product, we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support. You may contact us in whatever way is most convenient: Phone .

  • Page 7: Table Of Contents

    2.1 Introduction ..............................1 2.2 Installation ..............................2 2.2.1 AC Power Considerations ...........................2 2.2.2 Rack Mounting..............................3 2.3 Power-Up Sequence ............................3 2.4 Introduction to the LDT-5525 Front Panel....................3 2.4.1 Adjustments ..............................4 2.4.2 Display ..............................4 2.4.3 Parameters ..............................5 2.4.4 Parameter Setup.............................6 2.4.5 SENSOR CAL..............................6 2.4.6 Output...

  • Page 9: Chapter 1 - General Information

    You can configure the LDT-5525 to operate with a wide variety of thermistor temperature sensors and TE modules, as well as AD590 series and LM335 series temperature sensors.

  • Page 10: Available Options And Accessories

    Temperature Controller Interconnect Cable (unterminated) Calibrated 10 Kohm Thermistor Uncalibrated 10 Kohm Thermistor Uncalibrated AD590LH IC Temperature Sensor Uncalibrated LM335 IC Temperature Sensor Other Laser Diode Mounts are available. Please contact ILX Lightwave for information on additional options for your applications.

  • Page 11: Specifications

    Output current and power are rated into a 1 ohm load Higher output powers can be accommodated by using an external booster. Contact ILX Lightwave for further information. Broadband noise (10 Hz to 10 MHz) is measured at 1 Amp output current.
  • Page 12 LDT-5525 Specifications (continued) Thermistor range (10 µA): 0.0 to 450.0 KΩ Thermistor range (100 µA): 0.00 to 45.00 KΩ 25 to 450,000 Ω, typical Usable Thermistor Range: Thermistor Resistance Resolution (10 µA): 0.1 KΩ Thermistor Resistance Resolution (100 µA): 0.01 KΩ...
  • Page 13 LDT-5525 Specifications (continued) General Output Connectors: TEC I/O: 15-pin , D-sub Analog Output: Power Requirements: 90 - 125, 210 - 250 VAC (jumper selectable), @ 50-60 Hz Size: 3.5" x 7.3" x 12" Weight: 8.0 lbs. Ambient Temperature Range: Operating: 0 to 40°C Storage: -40 to 70°C...

  • Page 15: Chapter 2 - Operation

    This chapter describes how to install, adjust, and operate the LDT-5525 Temperature Controller. It is divided into sections covering installation, familiarization and adjustment, and normal operating procedures. Section 2.4 gives an overview of the LDT-5525's front panel features, and it presents a guide to quickly familiarize the user with the front panel operations.

  • Page 16: Rack Mounting

    2.2.2 Rack Mounting The LDT-5525 Series Precision Temperature Controller may be rack mounted by installing a rack mount flange on either side of the enclosure. All rack mount accessory kits contain detailed mounting instructions. Refer to Section 1.3 for applicable rack mount accessory part numbers.

  • Page 17: Adjustments

    Switch Switch Switch Figure 2.1 LDT-5525 Front Panel 2.4.1 Adjustments The ADJUST section contains the Adjust knob for entering values, and it contains the ENBL (adjust enable) switch and indicator. In order to make any adjustment, the ENBL indicator must be lit. Pressing the ENBL switch toggles the ENBL indicator on or off.

  • Page 18: Parameters

    LIMIT (temperature limit) and GAIN (sensor feedback amplifier gain). In addition, the sensor calibration values may be entered (see section 2.4.5, CAL). The LDT-5525 will limit the I TE output to the I LIMIT value, regardless of the set point or control mode.

  • Page 19: Parameter Setup

    The temperature is limited (via the sensor feedback) to the T LIMIT value. If the sensor reads a temperature which is greater than T LIMIT, the I TE output will be shut off. The GAIN value is used to control the sensor feedback gain, and thus the temperature settling time and overshoot. If the GAIN is set too low (1 is the lowest setting) the TE cooler will take longer to reach the temperature set point.

  • Page 20: Output

    When a linear sensor device (such as an AD590 or LM335) is used, a linear equation is used. If a linear sensor’s calibration is not known, set C1 = 0.00, C2 = 1.00. For more information on linear sensor calibration, see Appendix C. The range of values for C1 and C2 are -9.99 to +9.99.

  • Page 21: Control Mode

    2.4.7 Control Mode The MODE switch is used to select the control mode. Repeatedly pressing the MODE switch cycles through the current (I TE), sensor reference (R), or temperature (T) control modes. The LED indicators show the selected mode. Changing the control mode forces the output off. 2.4.8 Error Indicators The ERROR indicators become lit when the corresponding conditions occur.

  • Page 22: Back Panel Controls And Connections

    Entry Sensor Input) Module Figure 2.2 LDT-5525 Series Back Panel 2.5 Back Panel Controls and Connections Refer to Figure 2.2 for the following discussions of back panel controls and connectors. There are no user serviceable parts in the instrument, including the external fuses in the AC power entry module.

  • Page 23: Sensor Select Switch

    2.5.1 SENSOR SELECT Switch The SENSOR SELECT switch is used to select sensor type and, in the case of thermistor sensor, the source current level. Table 2.4 shows the SENSOR SELECT positions and corresponding position code. When the sensor switch is changed during TEC mode operation, the new sensor position code will be indicated on the TEC display for three seconds.

  • Page 24: Tec Connector

    Figure 2.3 Back Panel TEC Connector 2.5.3 TEC Grounding Considerations The TEC outputs of the LDT-5525 are isolated from chassis ground, allowing either output terminal to be grounded at the user's option. NOTE - For the TEC connector, if any one terminal pin is grounded, then no other terminal pin should be grounded.

  • Page 25: General Operating Procedures

    Operate the LDT-5525 Temperature Controller at an ambient temperature in the range of 0 to +40 °C. Storage temperatures should be in the range of -40 to +70 °C. To achieve rated accuracy, let the LDT-5525 Temperature Controller warm up for about 1 hour before use.

  • Page 26: Resistance Mode Operation

    (refer to the back panel for the correct ratings). b. Turn on the LDT-5525 Temperature Controller. The OUTPUT stage will be off at power-up and the unit will automatically configure its parameters to the state which existed when the power was last shut off.
  • Page 27 d. Check the setting of the SENSOR SELECT switch for the desired operation (10 µA or 100 µA). The sensor code will be displayed for two seconds during the power-up sequence (see Section 2.3). e. Press the PARAMETER switch and check the setting of I LIMIT, T LIMIT, and GAIN. Press the CAL switch and check the setting of C1 and C2 to insure that they are compatible with the equipment you are using.

  • Page 28: External Safety Switch Operation

    The LDT-5525 Temperature Controller may be used to control a booster current source which accepts a control signal of up to +5.0 volts. A booster current source may be required if the LDT-5525 Temperature Controller's +4 A, 24 W output is not adequate to control a thermal load.
  • Page 29 2, an I LIMIT of 3 Amps would allow a control voltage of ±6 volts. Whether or not a booster current source is used, the LDT-5525 Temperature Controller uses a sensor for controlling the temperature.

  • Page 31: Chapter 3 - Maintenance And Troubleshooting

    Chapter 3 MAINTENANCE AND TROUBLESHOOTING 3.1 Introduction This chapter describes how to maintain and troubleshoot the LDT-5525 Temperature Controller. Included are sections covering calibration, disassembly, and toubleshooting. WARNING THE SERVICE PROCEDURES DESCRIBED IN THIS CHAPTER ARE FOR USE BY QUALIFIED PERSONNEL. POTENTIALLY LETHAL VOLTAGES EXIST...

  • Page 32: Calibration Overview

    3.2.1 Recommended Equipment Recommended test equipment for calibrating the LDT-5525 Temperature Controller is listed in Table 6.1. Equipment other than that shown in the table may be used if the specifications meet or exceed those listed. RECOMMENDED TEST EQUIPMENT Description Mfg./Model...

  • Page 33: Environmental Conditions

    Calibrate this instrument under laboratory conditions. We recommend calibration at 23°C ± 1.0°C. When necessary, however, the LDT-5525 Temperature Controller may be calibrated at its intended use temperature if this is within the specified operating temperature range of 0 to 40°C.
  • Page 34 Connect the 4 KΩ metal film resistor to the sensor input of the LDT-5525 Temperature Controller (pins 7 and d. Enter the sensor calibration mode by pushing the MODE and SENSOR CAL switches at the same time. After this, the display will indicate the sensor resistance in KΩ.

  • Page 35: Ad590 Sensor Calibration

    Release the ENBL and wait for the VIEW SET indicator (LED) to be unlit. Replace the 20 KΩ resistor with a 10 KΩ metal film resistor. Wait for three seconds, then repeat Step d using the 10 KΩ resistor. Ten seconds after the ENBL switch is released, the LDT-5525 Temperature Controller will store the calibration data in non-volatile memory.

  • Page 36: Lm335 Sensor Calibration

    ITE current is driven to a series of pre-determined values. When each of these values is reached and is stable, the user enters the actual value of the current, as measured by an external DMM. The LDT-5525 Temperature Controller then automatically calibrates the TEC current source and limits.

  • Page 37: Troubleshooting

    Repeat Steps c and d four more times, once for each of the (automatically set) set points -3 Amps, +3 Amps, +1 Amp, and -1 Amp. After the value for the -1 Amp (last) set point is entered, the LDT-5525 Temperature Controller will automatically calibrate its ITE current limits.
  • Page 38 SYMPTOM CORRECTIVE ACTIONS Power on, but measured ITE 1. Check that pins 14 and 15 of current is always about 0.0 A the output connector are not connected (see Section 2.6.4, Booster Operation). Power on, but temperature is 1. If SENSOR OPEN indicator not controlled.
  • Page 39 SYMPTOM CORRECTIVE ACTIONS Unable to switch DISPLAY, 1. The unit may be in MODE, SENSOR CAL, or measurement calibration mode PARAMETER modes (see Chapter 3). Press the OUTPUT switch to abort this mode. Output goes off 1. Check that the AC power intermittently cord connection is secure.

  • Page 40: 5525 Production Calibration Procedure

    5525 Production Calibration Procedure LDT-5525 POST BURN-IN CALIBRATION I. Ite Current Calibration 1_______ Set the sensor select switch to "100 uA" and set C1 to 0.99, C2 to 2.57. 2_______ Connect the output to the TEC Cal/Test Fixture, and set the TEC Cal/Test Fixture for ITE calibration.
  • Page 41 2_______ Set the sensor select switch to "100 uA" (-01-). 3_______ Connect the output of the LDT-5525 to the 5525 Sensor Test Fixture. Set the fixture for SENSOR 1, Load 1 4_______ Hold down both the “MODE” and "SENSOR CAL" buttons. This will put the 5525 into "Sensor Cal"...
  • Page 42 2_______ Set the sensor select switch to "10 uA" (-01-). 3_______ Connect the output of the LDT-5525 to the 5525 Sensor Test Fixture. Set the fixture for SENSOR 2, Load 1 4_______ Hold down both the “MODE” and "SENSOR CAL" buttons. This will put the 5525 into "Sensor Cal"...
  • Page 43 IV. LM335 Sensor Calibration 1______ Set C1 to 0.00, C2 to 1.00. 2_______ Set the sensor select switch to "LM335" (-03-). 3_______ Connect the 5525 Sensor Test Fixture to the output connector. Set the 5525 Sensor Test Fixture to SENSOR 3, Load 1. 4_______ Connect a voltmeter to the 5525 Sensor Test Fixture via the banana jacks.
  • Page 44 V. AD590 Sensor Calibration 1______ Set C1 to 0.00, C2 to 1.00. 2_______ Set the sensor select switch to "AD590" (-04-). 3_______ Connect the 5525 Sensor Test Fixture to the output connector of the 5525. Set the 5525 Sensor Test Fixture to SENSOR 4, Load 1.
  • Page 45 VI. Temperature Settling Test 1_______ Set the 5525 sensor select switch to "100 uA" (-01-) and set C1 to 0.99, C2 to 2.57. 2_______ Connect the output to the TEC Cal/Test Fixture. 3_______ Set the TEC Cal/Test Fixture to Settling Sensor 1. 4_______ Set the 5525 to T mode, and set the temperature to 2°C.

  • Page 47: Appendix A - The Steinhart-Hart Equation

    Appendix A The Steinhart-Hart Equation Two-terminal thermistors have a nonlinear relationship between temperature and resistance. The resistance verses temperature characteristics for a family of similar thermistors is shown in Figure A.1. It has been found empirically that the resistance versus temperature relationship for most common negative temperature coefficient (NTC) thermistors can be accurately modeled by a polynomial expansion relating the logarithm of resistance to inverse temperature.
  • Page 48 -0.0030 -0.30 Table A.1 Comparison of Curve Fitting Equations For the LDT-5525, the Steinhart-Hart equation has been simplified to a first order polynomial: 1/T = A' + B' * ln R Equation 2 This equation is easier to solve and provides adequate results. Table A.1 also shows that the use of Equation 2 introduces temperature errors of less than 0.3°C over the range -20 C to 50°C, with accuracies of up to 0.06°C over...
  • Page 49 120 140 TEMPERATURE (DEGREES C) Figure A.1 Thermistor Resistance Versus Temperature Once the constants A' and B' are determined, the LDT-5525 Temperature Controller is programmed with the following values of C1, and C2: C1 = A' * 10 C2 = B' * 10...
  • Page 50 A small sample data file is included below as an example of the data format and end-of-data marker (R = -1). Temperature Resistance 97072 55326 32650 19899 12492 10000 8056.8 5326.4 3602.3 Run the STEIN1 program. The best curve fitting values for C1, and C2 will be displayed. Enter these numbers into the LDT-5525 Temperature Controller.
  • Page 51 80 REM * * * * * * * * * * * * * * STEIN1 * * * * * * * * * * * * * * * * * 90 REM 92 REM Rev: 3-11-87 94 REM T is expressed in Kelvins.
  • Page 52 (Program "STEIN1",continued from previous page) 1155 X(I)=LOG(R(I)) : Y(I)=1/(T(I)+273.15) 1160 PRINT USING H$; I, T(I), R(I) 1170 GOTO 1130 1180 N=I -1 1190 CLOSE 1200 REM **** accumulate sums **** 1205 SX=0 : SY=0 : SXY=0 : SXX=0 1210 FOR I = 1 TO N 1220 SX=SX+X(I) 1230 SY=SY+Y(I) 1240 SXY=SXY+X(I)*Y(I)

  • Page 53: Appendix B - Sensing Current And Thermistor Selection

    Choosing the right sensing current depends on the range of temperature you want to measure and the resolution you require at the highest measured temperature. To correctly set the SENSOR SELECT switch you must understand how the thermistor and the LDT-5525 Temperature Controller interact, and how temperature range and resolution values are inherent in the nature of thermistors.
  • Page 54 LDT-5525 Temperature Controller. Thermistor resistance and voltage are related through Ohms Law (V = I x R). The LDT-5525 Temperature Controller supplies current to the thermistor, either 10µA or 100µA. As the thermistor resistance changes, a changing voltage signal is available to the thermistor inputs of the LDT-5525.
  • Page 55 You must also consider measurement resolution since the measurement resolution decreases as the thermistor temperature increases. A temperature controller (such as the LDT-5525) has a limited measurement resolution. A temperature change of one degree centigrade will be represented by a greater resistance increase at a lower temperature than at a higher temperature because of the non-linear resistance of the thermistor.
  • Page 56 56 mV (if supplied with 10 µA). The same thermistor measurement will only change about 1.4 mV from 49 to 50°C! For that case, with the LDT-5525, the temperature measurement resolution would be reduced to about 0.2°C. If the 100 µA setting were used instead, the thermistor measurement would change by 14 mV from 49 to 50°C, providing the maximum resolution of 0.1°C (with the LDT-5525).
  • Page 57 If you require a different temperature range or the accuracy you need can't be achieved with either switch setting, select another thermistor. Thermistor temperature curves, supplied by the manufacture, show the resistance verses temperature range for many other thermistors. ILX Lightwave Corporation will also offer help for your specific application.
  • Page 59 Introduction The LDT-5525 Temperature Controller uses two constants (C1 and C2) for calibrating linear thermal sensing devices, such as the AD590, and the LM335. C1 is used as the linear or zero offset value, and C2 is used as the slope or gain adjustment.
  • Page 60 = C1 + ( C2 * T -where C1 and C2 are the constants stored by the user in the LDT-5525 Temperature Controller for the AD590. The AD590 measurement is calibrated, at the factory, with C2 = 1 and C1 = 0 (nominal values). The AD590 grades of tolerance vary, but typically this means that without adjusting C1 or C2, the temperature accuracy is +1 °C over its...
  • Page 61 ABSOLUTE ERROR (DEGREES C) -0.8 -1.6 DEGREES C Figure C.1 AD590 Nonlinearity If a maximum absolute error of 0.8 °C is tolerable (over the entire temperature range), the one point calibration of C1 should be used (see page C-5). If C1 is calibrated at 25 °C, and the intended operating range is 0 to 50 °C, a maximum error of about +0.2 °C may be expected over that operating range.
  • Page 62 = C1 + ( C2 * T -where C1 and C2 are the constants stored by the user in the LDT-5525 Temperature Controller for the LM335. When the LDT-5525 is shipped from the factory, the LM335 measurement system is calibrated, but the sensor (C1 and C2) is not.
  • Page 63 (slope) is known and is correct. Allow the LDT-5525 Temperature Controller to warm up for at least one hour. Set the SENSOR SELECT switch for the desired sensor type, and RECALL the constants for the particular device to be calibrated.
  • Page 64 It is used to determine the zero offset of the device and the gain offset (slope). Allow the LDT-5525 Temperature Controller to warm up for at least one hour. Set the SENSOR SELECT switch for the desired sensor type, and RECALL the constants for the particular device to be calibrated.
  • Page 65 First determine the intermediate values U and V, where V = (T ) / (T ), and U = T - (T * V) Then C1 and C2 can be determined by the following: = U + (V * C1) = V * C2 Replace C1 with C1 by selecting the C1 parameter and entering the new C1...

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