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ILX Lightwave -- LDT-5980

1. NAME Parameters FUNCTION CAL SOURCE SENSOr 1MA none Queries the 1 mA sensor current calibration coefficient CAL VTE 2 Enters the TE voltage calibration coefficients CAL VTE none Queries the TE voltage calibration coefficients CLS none Resets the Standard Event Status Register Status Byte Register and Error Queue to zero CONST ICI 2 Enters the IC I sensor coefficients CONST ICI none Queries the IC I sensor coefficients CONST ICV 2 Enters the IC V sensor coefficients CONST ICV none Queries the IC V sensor coefficients CONST RTD 4 Enters the RTD sensor coefficients CONST RTD none Queries the RTD sensor coefficients CONS HERMistor 3 Enters the thermistor Steinhart Hart coefficients CONS HERMistor none Queries the thermistor Steinhart Hart coefficients DELAY 1 Executes a GPIB delay in ms DISPlay 1 Used to turn front panel display on or off DISPlay none Queries the status of the front panel display ENABle EVEN 2 Enters the values for the Event Enable Registers ENABle EVENT none Queries the contents of the Event Enable Registers ENABle OUTOFF 2 Enters the value for the Output Off Enable Registers ENABle OUTOFF none Queries the contents of the Output Off Enable Registers ENABle OUTOFF DEFault none Resets Output Off Enable REgisters to factory default values ERRors none Queries the error
2. 3 Initial Inspection 0 0 eee 3 Grounding Requirements 3 AC Line Power Requirements 3 Tilt Foot Adjustment aa ies ee vena eke a Vasdal d eae ae Seed 3 Hack Mounting 4 ees ER dg boa Wi eee wee mea E duum keg 3 09_05 LDT 5980 5948 i Ld TT Available Options and 4 Specifications i obs Rees pa iw Re Oona CR as DUE aie Poa 5 Chapter 2 Operations Front Panel Overview 9 Rear Panel Overview 10 Rear Panel Controls and Connections 10 AC Power Entry Module 10 Trigger Input 10 Trigger Output Connector 10 GPIB Gonn tor sci 32 ere ach i o Ae ee tee 11 General Operation 12 Warm Up and Environmental 12 Rear Panel Connections 0000 ccc eens 12 TEC Grounding Considerations 13 Front Panel Operation 14 Display Section ete 14 Adjust Section sesadean eee
3. by averaging several readings obtained by remote querying the DMM 2h Set output to 5 A 44 5 A if 5948 2i Record preferably via MEASure VTE 2j Record 2k Disable output 120 LDT 5980 5948 Lightwave 09 05 21 2m 2n 20 2p 2q CALIBRATION AND TROUBLESHOOTING Calibration Procedure Calculate the VTE Measurement Slope and Offset using the following formulae m VTE pum T pum VTE T byre VTE Myre Enable Cal Mode by entering the remote command MODE CAL Enter the new calibration values using the command CAL VTE byte Save the new values to flash memory by using the CAL SAVE command Return to ITE Mode by the MODE ITE command To verify the cal values have been correctly stored use the CAL VTE command to query them 3 ITE MEASUREMENT CALIBRATION 3a 3b 3c Set output to 5 A 4 5 A if 5948 to prevent current limit from enabling and connect the DMM Digital MultiMeter across the TE Cal resistor to measure voltage Pay attention to polarity Allow one minute for current to stabilize if output has just been enabled Record the TE current ITEyyti as measured by the UUT using the MEASure IADC command Note Note Allow a minimum of 2 seconds to elapse between readings to ensure the instrument has had enough time to perform another round of measurements 3d 3e 3f 3g 3h 3i 3j
4. Mire For Model 5948 VTE bire 4 5 Mite TE TE For Model 5980 VTE bygg 5 0 EEE TE 4h Enable Cal Mode by entering the remote command MODE CAL 4i Enter the new calibration values using the command CAL COARSEDAC 4j Save the new values to flash memory by using the CAL SAVE command 4k Return to ITE Mode by the MODE ITE command 4l Verify the calibration values are correct by using the query CAL COARSEDAC to check them 122 LDT 5980 5948 Lightwave 09 05 5 CALIBRATION AND TROUBLESHOOTING Calibration Procedure SENSOR OUTPUT CURRENT CALIBRATION 5a 5b 5c 5d 5e 5f 5g 5h 5i 5j 5k Note 5I 5m 5n 5o 5p 5q 5r Select Sensor Mode and connect 100 kQ resistor across sensor loads Connect DMM across 100 resistor Rzens1 to measure voltage Pay attention to polarity Select 10 uA thermistor current from Sensor Parameter Menu Record voltage Vsens7 across 100 resistor Replace 100 resistor with 10 resistor Rsens2 Select 100 uA thermistor current from Sensor Parameter Menu Record voltage Vsens2 across 10 resistor Replace 10 resistor with 1 resistor Rsens3 Select 1 mA thermistor current from Sensor Parameter Menu Record voltage Vsens3 across 1 resistor Calculate scale factor for each current setting from the following fori 1 3 104A scalefactor 1004A 1 sens Pay
5. OPC none Queries the status of all overlapped commands OUTPUT 1 Turns the controller output on or off 64 LDT 5980 5948 Lightwave 09 05 COMMAND REFERENCE GPIB Commands Table 4 1 GPIB Command Summary Reference List NAME Parameters FUNCTION OUTPUT none Queries the state of the controller output PID 3 Enters the P I and D constants PID none Queries the P I and D constants PSC 1 Enables power on status and event clearing PSC none Queries the power on clear status PUD 1 Enters the program user data PUD none Queries the contents of the user data RADix 1 Enters the radix of returned integer values RADix none Queries the radix of returned integer values RCL 1 Recall a stored setup configuration RST none Performs a device reset SAV 1 Save the current setup configuration SENsor 1 Selects the sensor type SENsor none Queries the sensor type SET I 1 Enters the constant TE current setpoint SET ITE none Queries the constant TEcurrent setpoint SET SENsor 1 Enters the constant sensor setpoint SET SENsor none Queries the constant sensor setpoint SET Temp 1 Enters the constant temperature setpoint SET Temp none Queries the constant temperature setpoint SET V
6. REMOTE SENSOR LIMITS SAVEREGALL SELECT SELECT OUTPUT MAIN LOCAL lte Vte Selecting lg or Vrg will enable the instrument to operate in constant TEC current or constant TEC voltage mode when OUTPUT is turned on In lrg mode the setpoint current is continuously output to the TEC 30 LDT 5980 5948 Lightwave OPERATIONS Front Panel Operation In mode the controller output current is continuously adjusted to maintain the setpoint voltage across the TEC VTE mode is intended for applying a constant voltage into a typical TE load 10 lt R lt 2 50 In both 1 and Vtg modes sensor measurements are not used to adjust the output However sensor temperature is monitored for the purpose of automatically turning off the output if the user specified limits are exceeded See the Output Off Registers section in Chapter 3 Auto Tune is not available and user selectable PID constants are not used in lrg and Vre modes WU LLC Lightwave LDT 59xx TEMPERATURE CONTROLLER 002 500 t E DISPLAY MENU 4 TEMP VOLTAGE CURRENT SENSOR TEC LIMIT LIMIT LIMIT ERROR ERROR ENTER LOCK SYSTEM PARAMETER PID AUTO TUNE MODE POWER REMOTE SENSOR LIMITS SAVE RECALL MAIN LOCAL SELECT SELECT Rac Selecting Rac mode will enable the instrument to measure the resistance of a TE module The resistance of the TE module is measured by generation of a pseudo AC current of small ampl
7. 10 000 to 10 000 A Maximum Output Power 60W 120W Current Noise and Ripple 15 mA rms typical 15 mA rms typical Current Limit Range 5 to 5 Amps 10 to 10 Amps Current Limit Set Accuracy 0 050 Amps 0 050 Amps Control Algorithm Software PID Loop Software PID Loop Proportional Term 0 to 9999 99 0 to 9999 99 Integral Term 0 to 999 999 0 to 999 999 Derivative Term 0 to 999 999 0 to 999 999 TEMPERATURE SENSOR LDT 5948 LDT 5980 Types Thermistor NTC 2 wire RTD Sensor Platinum 100 Q 1000 Q IC Sensor IC V LM 335 Voltage output 5 mV C to 14mV C IC I AD 590 Current output 1uA K LDT 5980 5948 5 6 E OE CHAPTER 1 Specifications INTRODUCTION AND SPECIFICATIONS Thermistor Sensing Current 10 nA 100 uA 1 mA Useable Thermistor RTD Range 10 uA 10 to 600 100 uA 1 to 60 1mA 10 Q to 6 KQ Sensor Bias IC V 9V LM335 1mA RTD 1 0 mA User Calibration TEC MEASUREMENT DISPLAY Thermistor Steinhart Hart 3 constants IC Sensors offset slope RTD Ro A B C LDT 5948 LDT 5980 Thermistor Resistance 10 pA Setting Range 10 kQ to 600 kQ Resolution 0 001 kQ Accuracy 0 05 5 0 Q 100 uA Setting Range 1 kQ to 60 kQ Resolution 0 001 kQ Accuracy 0 05 0 5 1 mA Setting Voltage Measurement Range 10 Q to 6 kQ Resolution 0 001
8. 3k Record the TE voltage VTEnum1 as measured by the DMM Set output to 5 A 4 5 A if 5948 Record preferably via MEASure IADC Record VTEpyme Disable output Calculate the ITE Measurement Slope and Offset using the following formulae VTE DMM2 VTE DMM1 Mir Roe ITE s ITE yur VTE Dire ITE Enable Cal Mode by entering the remote command MODE CAL Enter the new calibration values using the command CAL ITE LDT 5980 5948 121 CALIBRATION AND TROUBLESHOOTING Calibration Procedure 3l Save the new values to flash memory by using the CAL SAVE command 3m Return to ITE Mode by the MODE ITE command To verify that the calibration values were correctly saved query the instrument with the CAL ITE command 4 ITE OUTPUT CALIBRATION 4a Set output to 5 000 A 4 500 A if 5948 to prevent current limit from enabling and connect the DMM Digital MultiMeter across the TE Cal resistor to measure voltage Pay attention to polarity 4b Allow one minute for current to stabilize if output has just been enabled 4c Record the TE voltage VTEpyum as measured by the DMM 4d Set output to 5 000 A 44 500 A if 5948 4e Record 4f Disable output 4g Calculate the ITE Output Slope and Offset using the following formulae For Model 5948 9 0 Ryg VTE DMM2 VTE DMM1 Mite For Model 5980 10 0 Rr VTE DMM2 VTE DMM1
9. User s Guide LDT 5900 Series Temperature Controllers High Power Temperature Controller LD T 5980 and Precision TH ILC Laser Diode Instrumentation amp Test Systems ILX Lightwave Corporation P O Box 6310 Bozeman MT U S A 59771 U S amp Canada 1 800 459 9459 International Inquiries 406 556 2481 Fax 406 586 9405 E mail support ilxlightwave com www ilxlightwave com TABLE OF CONTENTS Table of Contents i List of List of vii Safety and Warranty ix Safety Information and the ix General Safety 5 5 ix Safety Symbols eresi yeas og VERE ER ERE ruht GR x Safety Marking Symbols X Ee a expats eee xi Limitations siai vet gare kn ke rete Baa e e de o e oe OC ed ees xi Returning an Instrument xi Claims for Shipping Damage xii Comments Suggestions and Problems xiii Chapter 1 Introduction and Specifications Product Overview 2 Installing the LDT 5900
10. temperature based on the voltage delivered by the sensor An example of an IC V sensor is the National Semiconductor LM335A This device delivers 10mV K or approximately 2 98V at 25 C The terminal of the transducer should be connected to the RT pin and the terminal should be connected to RT The RT _SENSE and RT _SENSE pins should NOT be connected when using this device The nominal slope for the LM335A is 10mV K and the offset is nominally OmV but both can be adjusted to calibrate your particular sensor by entering the PARAMETER SENSOR menu The sensor will have approximately 1mA of current through it at all times In IC V sensor mode the LDT 5900 has a sensor voltage limit of 6V 525 00 C RTD Sensors When an RTD sensor is selected the LDT 5900 measures temperature based on the resistance An example of an RTD sensor is the Xian Diamond USA T2001SDL This device has a positive slope and a nominal resistance at 0 C of 100 ohms Two wire RTDs should be connected across the RT and RT pins as well as across the RT _SENSE and RT _SENSE pins Three wire RTDs are connected similarly to the two wire except that the third wire is specifically dedicated to the RT _SENSE pin The resistance versus temperature function for typical platinum RTDs is accurately modeled by the Callendar Van Dusen equation as shown below Ro 1 AT BT 100CT CT Where Ro Resistance Q at 0 C 36 LDT 5980 5948 Li
11. test not completed or was completed with errors Notes No internal self test is implemented TST will always retain zero Example TST response 0 indicates the self test was completed with no errors detected 09_05 LDT 5980 5948 115 COMMAND REFERENCE Command Reference WAI COMMON Wait to Continue DEVICE DEPENDENT FRONT PANEL Action Prevents the instrument from executing any further commands until OPC operation complete status is true Note This command has no effect for sequential commands and all commands for this instrument are sequential Example WAI action wait until OPC status is true 116 LDT 5980 5948 Lightwave CHAPTER 5 CALIBRATION AND TROUBLESH B E a mH E El Ei mH E mH E Li El L3 Ll a This chapter describes calibration and troubleshooting of the LDT 5900 Series Temperature Controllers Descriptions of the required test instruments calibration conditions and detailed procedures for calibration of the temperature controllers are included A troubleshooting guide is also offered for common failure problems ILX Lightwave Corporation provides in house and on site calibration services for ILX instruments Most ILX instruments require yearly calibration to ensure performance to published specifications ILX factory calibrations employ NIST traceable measurement instrumentation and our calibration engineers and technicians use automated test equipment to accurately and effic
12. 05 LDT 5980 5948 33 OPERATIONS _ Basic TEC Operation Instructions General Guidelines for Sensor Selection and Safety Limits This section presents some guidelines to assist in selecting the optimal settings for your application Sensor Options The LDT 5900 Series Temperature Controllers can measure temperature through a variety of sensor options thermistors IC sensors IC l IC V or RTDs Thermistor When a thermistor sensor is selected the LDT 5900 measures temperature based on using a negative temperature coefficient NTC thermistor An NTC thermistor is a device whose resistance decreases as its temperature increases The controller provides a sense current 100 uA or 10 uA through the thermistor which results in a voltage across the thermistor This voltage is used as a feedback signal by the LDT 5900 digital control loop to maintain a constant temperature The thermistor should be connected across the RT and RT pins as well as across the RT SENSE and RT SENSE pins In constant temperature mode the quantity that is maintained constant by the module is the sensor resistance In constant temperature mode T the LDT 5900 converts the temperature setpoint to a thermistor resistance setpoint using user defined constants The Steinhart Hart equation is used to convert a temperature to a resistance for thermistor sensors The equation describes the nonlinear resistance versus temperature characteristics of typical the
13. 1 Enters the constant TE voltage setpoint SET VTE none Queries the constant TE voltage setpoint SRE 1 Sets the Service Request Enable Register bits to allow generation of the user selectable service requests SRE none Queries the contents of the Service Request Enable Register STATus none Queries the contents of the Status Registers STB none Queries the Status Byte Register IME none Returns power on time IMER none Returns At since last TIMER query TRIGger IN ENABle 1 Enables trigger in function TRIGger IN ENABle none Queries state of trigger in function TRIGger IN STAR 1 Enters first trigger in temperature setpoint TRIGger IN START none Queries first trigger in temperature setpoint TRIGger IN STEPsize 1 Enters trigger in temperature setpoint step size TRIGger IN STEPsize none Queries trigger in temperature setpoint step size TRIGger IN STOP 1 Enters maximum trigger in temperature setpoint LDT 5980 5948 65 COMMAND REFERENCE Table 4 1 GPIB Command Summary Reference List 66 NAME Parameters FUNCTION TRIGger IN STOP none Queries maximum trigger in temperature setpoint TRIGger OUT DELAY 1 Enters time required for temperature to stay in setpoint tolerance before trigger out is generated TRIGger OUT DELAY none Queries trigger out delay time TST none Not implemented always retains zero WAI none Prevents executing any further commands until
14. COMMAND REFERENCE Command Reference 1 OUTOFF DEVICE DEPENDENT Action The ENABle OUTOFF query returns the contents of the controller Output Off Enable Registers Response The response is two values which represent the sum of the enabled bits for register 1 and the sum of the enabled bits for register 0 respectively Output Off Enable Register 1 Bit Number Condition Default Value Decimal Value 0 Reserved 0 1 1 Reserved 0 2 2 Reserved 0 4 3 Reserved 0 8 4 Measurement Out of Setpoint Tolerance 0 16 5 Reserved 0 32 6 Reserved 0 64 7 Reserved 0 128 8 Reserved 0 256 9 Internal PCB Temperature Out of Tolerance 1 512 10 Reserved 0 1024 11 Reserved 0 2048 12 TEC Current Runaway 0 4096 13 Reserved 0 8192 14 Reserved 0 16384 15 Reserved 0 32768 Notes These registers can be set by using the ENABle OUTOFF command Examples ENAB OUTOFF response 0 8 means that the Sensor Short is the only condition that will cause the controller output to be automatically turned off 84 LDT 5980 5948 Lightwave COMMAND REFERENCE Command Reference Output Off Enable Register 0 Bit Number Condition Default Value Decimal Value 0 Upper Temperature Limit 1 1 1 Lower Temperature Limit 1 2 2 Sensor Open 1 4 3 Sensor Shorted 1 8 4 TEC Current Upper Limit 0 16 5 TEC Cur
15. DISPLAY MENU buttons and the error indicators The display is a vacuum fluorescent display that is continually updated at approximately a 2 Hz rate The DISPLAY MENU arrow keys allow the user to select which measurement to display and to select the parameters to adjust in the various menus 025 508 C Error Indicators 14 LDT 5980 5948 Lightwave OPERATIONS Front Panel Operation The error indicators LEDs in the display section are described as follows TEMP LIMIT The Temperature Limit LED will be RED when either the Low Temperature or the High Temperature Limit is met or exceeded and the output will be shut off VOLTAGE LIMIT The Voltage Limit LED will be RED when either high or low TEC voltage limit is reached CURRENT LIMIT The Current Limit LED will be GREEN when either the high or low current limit is reached and the temperature error signal is decreasing e g when driving the load to a given setpoint The Current Limit LED will be RED when either the high or low current limit is reached and the temperature error signal is increasing e g system is in a thermal run away condition SENSOR ERROR The Sensor Error LED will be RED if the temperature sensor either a thermistor IC or RTD is open shorted or outside of the nominal measurement range TEC ERROR The TEC Error LED will be RED if the TEC is either shorted open or not connected For more information on which errors will
16. Example 104 LDT 5980 5948 COMMON Requests the factory stored identification string The response is an arbitrary data block with a maximum length of 25 bytes DEVICE DEPENDENT The RADix command allows the programmer to select the radix type for status condition and event query response data Decimal binary hexadecimal and octal are allowed One three letter character data value is required DECimal is the default type Only the first three letters of the words decimal hexadecimal binary or octal are required When the RADIX is selected all status condition and event queries will return values in the new radix In the cases where the radix is not DECimal the flexible numeric type nrf value as shown in the Command Reference diagrams will be replaced by HEX BIN or OCT representation All of the above radixes may be used to enter program data at any time without the need for issuing the RADix command The proper prefix must also be issued with Hex H binary B or octal 40 This command may be useful for setting up status reporting blocks The bit wise status representation may be more easily read in BIN HEX or OCT RAD dec action the decimal radix is selected Lightwave 09 05 COMMAND REFERENCE Command Reference RADix COMMON DEVICE DEPENDENT Action The RADix query allows the programmer to determine which radix type for status condition and event query response d
17. Thermistor 510 Uncalibrated 10 Kohm Thermistor 520 Uncalibrated AD590LH IC Temperature Sensor 530 Uncalibrated LM335 IC Temperature Sensor 540 To prevent fire hazard ILX recommends using only the CC59XH Series cables with the 5900 Series Temperature Controllers Unless properly configured use of other cables may lead to fire hazard and may limit the controller s maximum output current See Chapter 2 for more details Other laser diode mounts sensors and accessories are available Please contact ILX Lightwave for information on additional options for your applications 4 8 LDT 5980 5948 Lightwave 09 05 INTRODUCTION AND SPECIFICATIONS 1 Specifications CE d Specifications TEMPERATURE CONTROL LDT 5948 LDT 5980 OUTPUT Temperature Control Range Thermistor Sensor 50 000 C to 250 000 C 50 000 C to 250 000 C IC Sensor 50 000 C to 150 000 C 50 000 C to 150 000 C RTD 50 000 C to 199 999 C 50 000 C to 199 999 C Set Point Accuracy T Mode 0 005 C 0 01 C ITE Mode 0 03 A 0 03 A Vre Mode 0 05 V typical 0 05 V typical Set Point Resolution T Mode 0 001 C 0 001 C Ire Mode 0 001 A 0 001 A Vre Mode 0 001 V 0 001 V Temperature Stability 24 hours 0 005 C 0 005 C Output Type Bidirectional current source Compliance Voltage 12V DC 12V DC Output Current Range 5 000 to 5 000 A
18. controller output to turn off 417 Lower Voltage Limit caused controller output to turn off 418 Open TEC Module caused controller output to turn off 419 Shorted TEC Module caused controller output to turn off 420 Sensor over resistance caused controller output to turn off 421 Sensor under resistance caused controller output to turn off 422 Plus 3V supply out of tolerance condition caused controller output to turn off 423 Plus 5V supply out of tolerance condition caused controller output to turn off 424 Plus 15V supply out of tolerance condition caused controller output to turn off 425 Measurement out of setpoint tolerance caused controller output to turn off 426 PCB Temperature out of tolerance caused controller output to turn off 427 Invalid calibration data caused controller output to turn off 428 DSP reset caused controller output to turn off 429 Current limit and thermal runaway caused controller output to turn off 430 Cable change caused controller output to turn off 431 Neg 15V supply out of tolerance condition caused controller output to turn off 432 Setpoint over upper limit caused controller output to turn off 433 Setpoint under lower limit caused controller to turn off 714 Display error 715 Logic error 821 Command handler couldn t send message 832 UART received bad length byte LDT 5980 5948 59 60 REMOTE OPERATIONS Error Messages Table 3 9 Error Codes Error Code Explanation 850 Interna
19. key The setpoint for any mode can be modified by using the adjust knob and then pressing the ENTER LOCK key 09 05 LDT 5980 5948 29 OPERATIONS Front Panel Operation Selecting T will enable the instrument to operate in constant temperature mode when OUTPUT is turned on In T mode the controller output current to the TEC is continuously adjusted to maintain the setpoint temperature at the sensor Any of the sensor types thermistor RTD IC I IC V can be used in this control mode Auto Tune and user selectable PID constants are active in this mode HIN LIE Lightwave DT 59xX TEMPERATURE CONTROLLER 035 000 c t e DISPLAY MENU ENTER LOCK PARAMETER MODE PID AUTO TUNE TEMP VOLTAGE CURRENT SENSOR TEC LIMIT LIMIT LIMIT ERROR ERROR SYSTEM POWER REMOTE SENSOR LIMITS SABRE SELECT SELECT OUTPUT MAIN LOCAL Rsnsr Selecting Rswsg will enable the instrument to operate in constant sensor mode when OUTPUT is turned In Rsnsr mode the controller output current to the TEC is continuously adjusted to maintain the setpoint sensor resistance thermistor RTD current IC I or voltage IC V Auto Tune and user selectable PID constants are active in this mode Lightwave LDT 59xx TEMPERATURE CONTROLLER 009 988 9 t Se DISPLAY MENU TEMP VOLTAGE CURRENT SENSOR TEC 4 LIMIT LIMIT LIMIT ERROR ERROR ENTER LOCK SYSTEM PARAMETER MODE PID AUTO TUNE POWER
20. limit value will be determined by the value set by the LIMit SENsor HIgh command By default the controller output is turned off when the sensor measurement falls below this setting in Reng mode This feature can be disabled by clearing bit 12 in the Output Off Enable Register 0 using the ENABle OUToff command Example LIM SEN LO 95 2 action Sets the sensor lower limit to a minimum of 95 2 Q LIMit SENsor LOw Co DEVICE DEPENDENT FRONT PANEL Action The LIMit SENsor LOw query returns the value of the sensor lower limit setting Response The response is a single value that represents the lower sensor limit and the units depend on which sensor is selected For thermistor or RTD the value will be in Ohms for ICI Amps and for ICV Volts Notes This limit is only in effect in Rsnsr mode Example LIM SEN LO response 1200 000 when thermistor is selected means a lower sensor limit of 1200 Ohms LIMit Temp DEVICE DEPENDENT FRONT PANEL The LIMit Temp command path is used to access the temperature limit commands The following commands be reached directly from the LIMit Temp command path LIMit Temp Hlgh LIMit Temp HIgh LIMit Temp LOw LIMit Temp LOw 09 05 LDT 5980 5948 93 94 LDT 5980 5948 COMMAND REFERENCE Command Reference LIMit Temp HIgh Co DEVICE DEPENDENT FRONT PANEL Action The LIMit Temp HIgh command sets the upper temperature limit value Parameters An nrf value that repr
21. range namely 23 C 3 C If possible calibrate the unit at its intended use temperature if this is within the specified operating temperature range of 10 40 C Note Turn on and warm up the unit with output enabled at 5 Amps for a minimum of five minutes prior to calibration Recommended Equipment A digital voltmeter comparable to an Agilent 34401A is required for instrument calibration The pertinent specifications are listed below DC Voltage Measurement Accuracy 0 00296 0 10VDC 4 wire Kelvin Resistance Measurement 0 00296 Accuracy 0 1MQ Input Resistance gt 10 GQ ranges 10V and lower Several different resistive loads are required for calibration as shown below Sensor Measurement Calibration 10 100 O 1 10 and 100 resistors 1 1 4 W 1 PPM temperature coefficient TE Measurement Output 1 O resistor 1 100W or greater 25 50 PPM Calibration temperature coefficient adequately heatsunk TE output calibration 6 Q resistor 196 5W or greater 25 50 PPM temperature coefficient adequately heatsunk RAC calibration Low resistance cabling capable of running at five Amperes continuous duty is required to connect between the unit s output connector and the TE test load The TE cabling should be twisted together as one bundle and the sensor cabling twisted together in a separate bundle to minimize noise The TEC Sense and Sensor Sense lines must be connected to their corre
22. recall at next power ON Example SAV 2 action saves the current setup configuration as 2 LDT 5980 5948 105 COMMAND REFERENCE Command Reference SENsor DEVICE DEPENDENT f Action The SENsor commands selects the sensor type and sense current Parameter One lt character data value gt representing the sensor type is required The values accepted are THERM10UA THERM100UA THERM1MA ICI ICV RTD10UA RTD100UA or RTD1MA Notes For thermistor or RTD sensors a sense current is applied through the sensor and the resulting voltage is measured by the instrument The measured voltage range is 0 6V The best sense current to use depends on the expected resistance at the setpoint The largest possible voltage swing in the vicinity of the setpoint will result in the best stability For more details regarding proper sensor selection and sense current refer to Chapter 2 Example SEN THERM100UA action sets the sensor to thermistor and the sense current to 100 pA SENsor DEVICE DEPENDENT Action The SENsor query returns the selected sensor type and sense current if appropriate Response The response is a single character string that represents the selected sensor and is one of the following THERM10UA THERM100UA THERM1MA ICI ICV RTD10UA RTD100UA or RTD1MA Notes Example SENsor Response ICI means the ICI sensor is selected SET DEVICE DEPENDENT FRONT PANEL The SET command path is used to access
23. resolution 0 005 C stability Constant temperature constant current constant resistance and constant voltage control modes Compatible with thermistors IC and RTD temperature sensors Four wire sensor measurements Four wire TEC voltage measurement AC resistance measurement Heating and cooling temperature and current limits Software controlled PID feedback loop control PID Autotune mode IEEE GPIB and RS 232 remote interfaces Programmable triggers Closed case calibration 2 LDT 5980 5948 Lightwave INTRODUCTION AND SPECIFICATIONS Installing the LDT 5900 Installing the LDT 5900 This section provides information about the necessary requirements to install a LDT 5900 Series Temperature Controller and how to begin operating the instrument Initial Inspection Verify that the following items were shipped with the instrument LDT 5900 User s Guide Power Cord When unpacking the instrument make sure to save the packaging and protective Electrostatic Discharge ESD cap on the rear of the instrument in case you have to return the instrument to ILX Lightwave Shipping damage is not covered under the standard instrument warranty Grounding Requirements The LDT 5900 Series Temperature Controller comes with a three conductor AC power cable The power cable must be plugged into an approved three contact electrical outlet or used with a three contact to two contact adaptor
24. successful Auto Tune 24 LDT 5980 5948 IN ILX Lightwave 09 05 OPERATIONS Front Panel Operation If AutoTune N A is displayed the Auto Tune feature and modification of the PID constants is not available for the currently selected control mode To abort an Auto Tune that is in progress press the OUTPUT key The instrument will then disable the output and the display will read Auto Tune Failed The P and D values will remain unaltered There are limitations to the Auto Tune feature Any of the following will cause the Auto Tune algorithm to fail Thermal systems where P lt 0 5 or I lt 0 1 Noisy temperature measurements Reaching any output off enable condition such as temperature or voltage limits during the auto tune operation see Output Off Registers in Chapter 3 If the Auto Tune algorithm fails for a particular thermal system it may be necessary to modify the PID coefficients manually as described in the following section Modifying the PID Coefficients The Auto Tune algorithm is designed to provide coefficients for optimal performance but if improvement is required the nominal coefficients can be further optimized manually to obtain the desired performance using the following guidelines The proportional gain coefficient essentially pushes the system to its final setpoint Increasing the P will decrease the response time Conversely decreasing P will increase the response
25. syntax of GPIB commands follow the rules defined in the ANSI IEEE 488 2 1987 standard 09 05 LDT 5980 5948 43 REMOTE OPERATIONS Remote Communication Letters Any GPIB or RS 232 command or query must contain all of the letters that are shown in upper case in the command definition though they do not need to be typed in upper case Some of the device dependent commands include optional letters shown in lower case in the command reference Chapter 4 Command Reference Letter case does not matter Lower case characters are used in this manual to identify optional letters although the optional letters must be in the correct sequence Some examples of what does and does not work Okay Not Okay DISP DS Disp dsp Displ dply Displa DSPLY Display disply White Space White space is normally the space character space bar A single white space must separate a command from its parameters or data For example Okay Not Okay DELAY 500 DELAY500 To enhance readability you can use one or more white spaces before a comma semicolon or terminator Since a computer normally puts the terminator at the end of each command string line an extra space character at the end of the command line does not affect the command string A query has no space between the mnemonic and the question mark For example Okay Not Okay TIMER TIMER Note Too
26. the MEASure SENsor command Calculate using Ohm s Law the voltage drop corresponding to the UUT measured resistances V senslx Vi R senslx Calculate the 10 uA Sensor Voltage Measurement slope and offset using the equations below forx a amp b _ sensla vsensl Vi Via b V vsens senslb M sensi Vip Enable Cal Mode by entering the remote command MODE CAL Enter the new calibration values by using the command CAL SENsor VOLTage 10UA mysens 1 Pysens1 Save the new values to flash memory by using the CAL SAVE command Return to Sensor Mode by using the MODE SENSOR command Verify the correct storage of the calibration values by entering CAL SENsor VOLTage 10UA Begin calibration of 100 uA thermistor current by selecting 100 uA thermistor current from Sensor Parameter Menu Connect 100 Q resistor Rsens2a to sensor leads Connect the DMM across the resistor as well to measure voltage Record voltage Vsens2a across Rsens2a as measured by DMM Record UUT measured resistant R24 using the MEASure SENsor command Replace 100 resistor with 10 resistor Rsensop and record voltage Vsens2b across resistor as measured by DMM Record UUT measured resistance Rap using the MEASure SENsor command Lightwave 6s 6t 6u 6v 6w 6x 6y 6z 6aa 6ab 6ac 6ad 6ae 09 05 CALIBRATION AND TROUBLESHOOTING Calibration Procedure Calculate usi
27. the status byte bit 5 ESE COMMON Event Status Enable Action Requests the value in the Standard Event Status Enable Register Response The value must be between 0 and 255 LITT 1 AAA Numeric B Value Operation complete 1 Query error 4 Device dependent error 8 Execution error 16 Command error 32 User request 64 Power on 128 339REG1 L Unused bits Notes Bit 5 of the the Status Byte Register STB is set if any enabled conditions are true Response is the sum of the enabled bits Example ESE Response 128 means power on status will be reported in the status byte bit 5 86 LDT 5980 5948 Lightwave COMMAND REFERENCE Command Reference ESR COMMON DEVICE DEPENDENT Standard Event Status Register aa deli ENDENI FRONT PANEL Action Requests the value in the Standard Event Status Register Response The value must be between 0 and 255 AAA Numeric Value Operation complete 1 Query error Device dependent error 8 Execution error 16 Command error 32 User request 64 Power on 128 m C Unused bits Notes Response is the sum of the status bits This command allows you to determine which type of error has occurred The following three things will clear this register the ESR query a power on when PSC is set true and the CLS command See Chapter 3 for more information about register structure Example ESR Response 32 means a command e
28. well defined mean value for Raco Ti Calculate the Rac Slope and Offset values using the following formulae Rrac Ry Rcs n Ric Mrac brac Rrac Mpc Raca 126 LDT 5980 5948 Lightwave CALIBRATION AND TROUBLESHOOTING Calibration Procedure 7j Enable Cal Mode by entering the remote command MODE CAL 7k Enter the new calibration values using the command CAL RAC mgac bgAc NOTE The offset value that must be entered in the above step is the negative of the value calculated in step i 7 Save the new values to flash memory by using the CAL SAVE command 7m Return to RAc mode by the MODE RAC command 7n Verify the calibration values are correct by issuing the query CAL RAC to check them 09 05 LDT 5980 5948 127 _ Troubleshooting Troubleshooting CALIBRATION AND TROUBLESHOOTING This section is a guide to troubleshooting the LDT 5900 Series Temperature Controllers Some of the more common symptoms are listed here and the appropriate troubleshooting actions are given If problems persist contact ILX Customer Service see page xii for contact information Also check the www ilxlightwave com Support page and the Library page for Application Notes and Technical Notes Table 5 1 Problem and Action SYMPTOM CORRECTIVE ACTIONS General Unit will not power up Check AC Power line voltage and power cord connection Instrument is locked up or instrument resets itself Powe
29. with a 1 mA sensor supply current Parameters Two values are required to set the sensor voltage calibration The first represents the slope and the second represents the offset in voltage measurement Notes This is a service command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section of Chapter 5 for complete calibration instructions Example CAL SEN VOLT 1MA 1 0 action Enters a slope of 1 0 V V and an offset of 0 V for the sensor voltage measurement calibration 09 05 LDT 5980 5948 71 72 LDT 5980 5948 COMMAND REFERENCE Command Reference CAL SENsor VOLTage 1MA Action Response Notes Example DEVICE DEPENDENT The CAL SENsor VOLTage 1MA query returns the calibration coefficients for the sensor voltage measurement with a 1 mA sensor supply current The response is two values the first represents the calibration voltage measurement slope and the second represents the voltage offset coefficients See the Calibration section of Chapter 5 for complete calibration instructions CAL SEN VOLT 1MA Response 1 0 means a slope of 1 0 V V and an offset of 0 V for the sensor voltage measurement calibration CAL SOURCE SENsor 10UA Action Parameters Notes Example DEVICE DEPENDENT The CAL SOURCE SENsor 10UA is used to enter the calibration coefficient for the 10 sensor current source One lt nrf value gt is req
30. 100UA LDT 5980 5948 67 COMMAND REFERENCE Command Reference CAL COARSEDAC DEVICE DEPENDENT Action The CAL COARSEDAC is used to initiate the calibration of the TE current setpoint by allowing the user to enter calibration coefficients Parameters Two lt nrf gt values are required The first one represents the TE current setpoint slope and the second represents the offset Notes This is a service related command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section of Chapter 5 for complete calibration instructions Example CAL COARSEDAC 1 0 action Enters a slope of 1 and offset of 0 for the TE current setpoint calibration CAL COARSEDAC DEVICE DEPENDENT Action The CAL COARSEDAC query is used to report the current TE current setpoint calibration coefficients Response The response data will be two values The first represents represents the calibration slope The second represents the offset Notes See the Calibration sectionCalibration section for complete calibration instructions Example CAL COARSEDAC response 1 0 CAL DEFault Col DEVICE DEPENDENT Action The CAL DEFault command sets all of the calibration constants to default uncalibrated values Parameters None Notes This command should only be used in the case that the calibration has become corrupted or the instrument needs recalibration Measurements and setpoints
31. 15Volts query returns the measured value of the internal 15 0V PCB power supply Response The response is a single value that represents the measured voltage of the power supply Notes The acceptable voltage ranges from 11 5 V to 16 0 V Example MEAS NEG15V response 12 2 means the 15V supply is providing 12 2 V MEASure PTE Co DEVICE DEPENDENT Action The MEASure PTE query returns the measured output power to the TEC Response The response is a single value that represents the measured power in Watts Notes The response is the measured output power calculated by V l and is regardless of control mode Example MEAS PTE response 1 3 means the measured output power is 1 3W 09 05 LDT 5980 5948 99 COMMAND REFERENCE Command Reference MEASure RAC Col DEVICE DEPENDENT FRONT PANEL Action The MEASure RAC query returns the value of the last AC resistance measurement Response The response is a single value that represents the measured RAC value in Ohms Notes This query will return the RAC value last measured by the instrument Example MEAS RAC response 1 437 means the last AC resistance measurement was 1 4370 MEASure SENsor Col DEVICE DEPENDENT FRONT PANEL Action The MEASure SENsor query returns the measured value of the sensor Response The response is a single value that represents the measured sensor value Notes The response is the measured sensor regardless of control mode and the units are dep
32. 58 Chapter 4 Command Reference GPIB Commands 62 Command Reference 67 09 05 LDT 5980 5948 iii L nc dM Chapter5 Calibration and Troubleshooting Calibration s 220i Wee ke ha ee ew ER thee der dansere va 118 Recommended Equipment 118 Calibration Procedure 120 Troubleshooting 128 Error Codes isisa sure kg kite oo one bat Mee ae 129 iv LDT 5980 5948 Lightwave LIST OF FIGURES Figure 2 1 Front Panel 9 Figure 2 2 Rear Panel 10 Figure 2 3 Trigger Out 10 Figure 2 4 Rear Panel TEC 12 Figure 2 5 Front Panel 14 Figure 2 6 Auto Tuning Process 23 Figure 2 7 Example Thermistor Resistance vs Temperature 35 Figure 3 1 LDT 5900 Command Path Structure 47 12 02 LDT 5980 5048 vw vi LDT 5980 5948 Lightwave 12 02 Table 2 1 Table 3 1 Table 3 2 Table 3 3 Table 3 4 Table 3 5 Table 3 6 Table 3 7 Table 3 9 LIST OF TABLES PID Constant 22 Substitute Parameter Names 46 Inva
33. 9 OPERATIONS Basic TEC Operation Instructions 40 LDT 5980 5948 uix Lightwave CHAPTER 3 REMOTE OPERATIONS El a E El w E Li mH E Ej Ei E a a Everything you can do from the front panel can also be done remotely and in some cases with more flexibility For instance in remote mode you have access to commands for functions not found on the front panel The following sections show you the fundamentals of operating your LDT 5900 module remotely through the General Purpose Interface Bus GPIB and RS 232 interfaces Remote Configuration GPIB Configuration GPIB General Purpose Interface Bus is the common name for ANSI IEEE Standard 488 2 1987 an industry standard for interconnecting test instruments in a system Before you can operate the LDT 5900 Series Temperature Controller from a remote location with GPIB you need to know its GPIB address The following sections describe reading and changing the GPIB address Reading the GPIB Address Press the MAIN LOCAL key in the system section of the front panel to view the System Menu Page 1 of the System Menu is the Communications menu and GPIB address will be displayed in the GPIB field directly under this menu Changing the GPIB Address Every device on the GPIB bus must have a unique address The default address from the factory is address 01 If it is necessary to change the address press the MAIN LOCAL key in the System section of the front panel Page 1 d
34. 99 0 8 Derivative 0 999 999 1 0 The LDT 5900 Series Temperature Controllers have an auto tune algorithm that will help the user determine nominal values for the PID coefficients While the auto tuned values typically provide acceptable stability and overshoot for a given thermal system these values can usually be optimized through further user tuning as described later in this section 22 LDT 5980 5948 Lightwave 09 05 Temperature Celsius 31 30 29 m N 26 25 24 OPERATIONS Front Panel Operation Auto Tune Operation The auto tune algorithm in the LDT 5900 series of temperature controllers will calculate a thermal system s PID coefficients through an iterative PID temperature control process Figure 2 6 describes the tuning process pictorially 6 Tuning Set Point 3 P amp D Values Tuned P Term is Lowered 7 Value D 5 Integral Term Added to Control 4 P Term being Decreased Causes Temperature Decrease m 2 Auto Tune Start Only Proportional Term Used NS Ambient Temperature 5 10 15 20 Time Minutes Figure 2 6 Auto Tuning Process The auto tune algorithm starts controlling temperature Point 2 on Figure 2 6 with an arbitrary coefficient for the loop gain P term and slowly increases it until the temperature begins to oscillate Once the temperature begins to oscillate the P term is reduced by 40 and the D term is calculated Poi
35. AIN LOCAL key in the System section of the front panel Page 1 displays the Communications menu Press the down arrow to select the RS 232 Baud field The baud rate can be changed by turning the adjust knob until the desired baud rate is displayed and then press the ENTER LOCK key The baud rate will then be stored in non volatile memory 42 LDT 5980 5948 Lightwave REMOTE OPERATIONS Remote Communication Remote Communication This section contains information about changing operation from local to remote GPIB vs RS 232 communication the command set command syntax and error and status registers Before remote communications are initiated be sure to configure the GPIB or RS 232 as described above Refer to Chapter 4 Command Reference for information about specific commands Changing Operation from Local to Remote Sending a command over the GPIB or RS 232 interface will automatically put the instrument in REMOTE mode The REMOTE indicator in the SYSTEM section of the front panel will illuminate when the controller is in remote operation mode When in REMOTE mode all buttons and the knob are disabled except for the MAIN LOCAL button When the instrument is in REMOTE mode pressing the MAIN LOCAL button on the front panel returns the instrument to LOCAL control mode and re enables front panel input GPIB Versus RS 232 Communication The LDT 5900 Series Temperature Controller should not be run remotely via GPIB an
36. Code Explanation 0 No errors found 123 Command not found 124 Look up failed because query command match failed 125 Parser syntax error 126 End of data error 127 Invalid parameter for command 130 Query not supported 131 Command not supported 201 Parameter value out of range 202 Error in conversion of parameter type 203 Command is a secure command but secure commands are disabled 214 Response is too long to output 226 Error in arbitrary block specification 228 Delimiter not found 230 Invalid internal response 301 No data found error 302 Not empty error LDT 5980 5948 Lightwave 09 05 REMOTE OPERATIONS Error Messages Table 3 9 Error Codes Error Code Explanation 401 Controller output off error 402 Calibration failed 403 DSP reset failed 404 Calibration constant error 405 Invalid sensor error 407 Invalid mode error 408 DSP controller communication failure 410 Upper Temperature Limit caused controller output to turn off 411 Lower Temperature Limit caused controller output to turn off 412 Open sensor caused controller output to turn off 413 Shorted sensor caused controller outputcontroller output to turn off 414 Upper Current Limit caused controller output to turn off 415 Lower Current Limit caused controller output to turn off 416 Upper Voltage limit caused
37. E 03 B 1E 07 and C 1E 12 Notes Acceptable values for A B and C are 99 99 to 999 99 Acceptable values for Ro are 0 to 99 999 99 Ohms RTD coefficients are typically supplied by the manufacturer Example CONST RTD 3 4 7 0 5 0 100 1 action sets the RTD coefficients as follows A 3 4 B 7 0 C 5 0 Ro 100 1 Q CONST RTD COMMO DEVICE DEPENDENT FRONT PANEL Action The CONST RTD query returns the A B C and Ro coefficients for an RTD sensor Response The response is four values that represent the values of A B C and Ro in that order Notes These values are pre scaled so that the exponential value is not given The actual value of A is scaled by 10E 03 B by 10E 07 and C by 10E 12 Example CONST RTD response 3 4 7 0 5 0 100 1 The RTD coefficients are A 3 4 B 7 0 C 5 0 and Rg 100 1 Q Lightwave COMMAND REFERENCE Command Reference CONST THERMistor DEVICE DEPENDENT FRONT PANEL Action The CONST THERMistor command sets the Steinhart Hart coefficients for thermistor Parameters Three lt nrf values gt are required The first represents C1 the second is the C2 the third is C3 The scale factors for C1 C2 and C3 are programmed into the instrument and are as follows C1 1E 03 C2 1E 04 and C3 1E 07 Notes Acceptable values C1 C2 and C3 are 0 to 999 99 A thermistor s nominal Steinhart Hart coefficients are typically supplied by the thermistor manufacturer Precision calibrated 10 kohm thermist
38. E T DEC Missing semicolon DEC command generates an error DISP Space not allowed before question mark DISP command expected Lightwave REMOTE OPERATIONS Remote Communication IEEE 488 2 Common Commands IEEE 488 2 Common Commands and Queries are distinguished by the which begins each mnemonic The diagrams below show the syntax structure for common commands common command queries and common commands with numeric data required Numeric data is required with PSC 1 on 0 off RCL 0 to 9 see Save Recall on page 15 SAV 1 to 9 see Save and Recall on page 15 ESE 0 to 255 see page 34 SRE 0 to 255 see page 38 and PUD used at factory only The instrument self test query TST will always return 0 since no self test routine is incorporated into the unit A list of all of the IEEE 488 2 Common Commands supported by the LDT 5900 Series Temperature Controllers follows CLS ES ESE ESR IDN OPC OPC PSC PSC PUD PUD RCL RST SAV SRE SRE STB TST WAI Command Timing This section describes for each command whether the command is performed in an overlapped or sequential manner Command timing states whether the next command can begin while another command is being executed or if the next command must wait until this command is completed before its execution begins See Operation Complete Definition on page 40 for informati
39. EL Action Requests the value in the Service Request Enable Register Response The value must be between 0 and 255 Numeric Value ENABle EVENT Summary 1 Message Available MAV 16 ESE Event Summary ESB 32 ERR Error Log Available 128 Unused bits Notes Refer to the GPIB IEEE488 2 1992 standard for more information on Service Requests Example SRE Response 0 means the SRQ generation is disabled 09_05 LDT 5980 5948 109 110 COMMAND REFERENCE Command Reference STATUS C DEVICE DEPENDENT FRONT PANEL Action The STATUS query returns the contents of the controller Status Registers Response The response is two values which represent the sum of the status bits for register 1 and the sum of the status bits for register 0 respectively Status Register 1 LDT 5980 5948 Bit Number Condition Decimal Value 0 RAC Measurement Complete 1 1 Reserved 2 2 Output On 4 3 Measurement Within Setpoint Tolerance 8 4 Measurement Out of Setpoint Tolerance 16 5 Reserved 32 6 Reserved 64 7 Reserved 128 8 Reserved 256 9 Internal PCB Temperature Over Limit 512 10 Invalid Calibration Data 1024 11 DSP Reset 2048 12 TEC Temperature Runaway 4096 13 Reserved 8192 14 15V PCB Supply Out of Tolerance 16384 15 Reserved 32768 Notes These registers represent the current real time status of the controller and sensors Example STATUS respon
40. KEY LINEFREQ LINEFREQ MES MES MODE MODE OUTPUT OUTPUT PID PID RAD TIMER CONST ICI CONST ICI CONST ICV CONST ICV CONST RTD CONST RTD CONST THERM CONST THERM MEAS 3V MEAS 5V MEAS 15V MEAS INTT MEAS ITE MEAS NEG15V MEAS PTE MEAS RAC MEAS SEN MEAS TEMP MEAS VTE ENAB EVENT ENAB EVENT ENAB OUTOFF ENAB OUTOFF ENAB OUTOFF DEF CAL COARSEDAC CAL COARSEDAC CAL DEF CAL ITE CAL ITE CAL RAC CAL RAC CAL SAVE CAL SEN VOLT IOUA CAL SEN VOLT 10UA CAL SEN VOLT 100UA CAL SEN VOLT 100UA CAL SEN VOLT 1MA CAL SEN VOLT 1MA CAL SOURCE SEN 100UA SET ITE LIM ITE HI SET ITE LIM ITE HI SET SEN LIM ITE LO SET SEN LIM ITE LO SET TEMP LIM SEN HI SET TEMP LIM SEN HI SET VTE LIM SEN LO SET VTE LIM SEN LO LIM TEMP HI LIM TEMP HI LIM TEMP LO LIM TEMP LO LIM TOL TRIG IN ENAB LIM TOL TRIG IN ENAB LIM VTE HI TRIG IN START LIM VTE HI TRIG IN START LIM VTE LO TRIG IN STEP LIM VTE LO TRIG IN STEP TRIG IN STOP TRIG IN STOP TRIG OUT DELAY TRIG OUT DELAY CAL SOURCE SEN 100UA CAL SOURCE SEN 1MA CAL SOURCE SEN 1MA CAL SOURCE SEN 10UA CAL SOURCE SEN 10UA CAL VTE CAL VTE Figure 3 1 LDT 5900 Command Path Structure LDT 5980 5948 47 48 LDT 5980 5948 REMOTE OPERATIONS Remote Communication Syntax Summary GPIB or RS 232 commands must contain all of the letters shown in upper case in the command definition Optional letters shown in
41. LE EVENT and ENABLE OUTOFF commands and queries The Event REgisters are used to report when status bits get set and the Output Off Registers are used to specify the conditions that force the controller output to turn off Refer to Chapter 4 Command REference in this guide for more information about issuing these commands Status Registers The Status Registers report the current state of the temperature controller operation and the sensors A host controller program must poll the LDT 5900 using the STATUS query to access these registers The bits of the two 16 bit registers are defined as shown in Table 3 3 and 3 4 Table 3 3 LDT 5900 Status Registers Status Register 0 Bit Number Condition Decimal Value 0 Upper Temperature Limit 1 1 Lower Temperature Limit 2 2 Sensor Open 4 3 Sensor Shorted 8 4 TEC Current Upper Limit 16 5 TEC Current Lower Limit 32 6 TEC Voltage Upper Limit 64 7 TEC Voltage Lower Limit 128 8 TEC Open 256 9 TEC Shorted 512 10 Auto Tune in Progress 1024 11 Sensor Upper Limit 2048 12 Sensor Lower Limit 4096 13 3V PCB Supply Out of Tolerance 8192 14 5V PCB Supply Out of Tolerance 16384 15 15V PCB Supply Out of Tolerance 32768 09 05 LDT 5980 5948 51 REMOTE OPERATIONS Status Reporting cuarter Table 3 4 LDT 5900 Status Registers Status Register 1 Bit Num
42. LOw command By default the controller output is turned off when the measured sensor exceeds this setting in Rsnsr mode This feature can be disabled by clearing bit 11 in the Output Off Enable Register 0 using the ENABle OUTOFF command Example LIM SEN HI 450 100 action Sets the sensor upper limit to a maximum of 450 10 LIMit SENsor HIgh Action Response Notes Example DEVICE DEPENDENT FRONT PANEL The LIMit SENsor Hlgh query returns the value of the sensor upper limit setting The response is a single value that represents the upper limit and the units depend on which sensor is selected For thermistor or RTD the value will be in Ohms for ICI Amps and for ICV Volts This limit is only in effect in Reng mode LIM SEN HI response 450100 00000000 when the thermistor is selected means a upper sensor limit of 450 100 Ohms Lightwave COMMAND REFERENCE Command Reference LIMit SENsor Low COMM DEVICE DEPENDENT FRONT PANEL Action The LIMit SENsor LOw command sets sensor lower limit value Parameters nrf value that represents the lower sensor limit Units depend on which sensor is selected For thermistor and RTD units are Ohms for ICI Amps and for ICV Volts Notes Acceptable values for thermistors are 1 to 600000 O Acceptable values for RTD are 0 1 to 60000 0 Acceptable values for ICI are 0 000010 to 0 000600 Amps Acceptable values for ICV are 0 100 to 6 000 Volts The maximum lower
43. NT PANEL Action The TRIGger IN STOP query returns the value of the stopping temperature setpoint Response The response is a single value that represents the stopping temperature setpoint in C Notes Example TRIG IN STOP response 40 means the stopping temperature setpoint is 40 9C TRIGger OUT DELAY DEVICE DEPENDENT FRONT PANEL Action The TRIGger OUT DELAY command sets the delay between the setpoint being in tolerance and the output trigger going high Parameters nrf value that represents the desired delay time in seconds is required Notes This command can be used to delay when the output trigger goes high to insure the thermal load is stable Valid input range is 0 to 60 000 seconds Example TRIG OUT DELAY 5 action Sets a 5 second delay between when the temperature is within set tolerance and when the output trigger goes high The temperature must stay within tolerance during the entire delay period TRIGger OUT DELAY C DEVICE DEPENDENT FRONT PANEL Action The TRIGger OUT DELAY query returns the value of the trigger out delay Response The response represents the delay time in seconds Example TRIG OUT DELAY response 5 means the control feedback measurement temperature must remain within the setpoint tolerance for 5 seconds before trigger out will go high TST COMMON Action Performs internal self test then reports results Response 0 test completed with no errors Non zero
44. PCB Supply Out of Tolerance 0 32768 LDT 5980 5948 Lightwave REMOTE OPERATIONS Status Reporting Table 3 8 LDT 5900 Output Off Register Contents Output Off Enable Register 1 Bit Number Condition Default Value Decimal Value 0 Reserved 0 1 1 Reserved 0 2 2 Reserved 0 4 3 Reserved 0 8 4 Measurement Out of Setpoint Tolerance 0 16 5 Reserved 0 32 6 Reserved 0 64 7 Reserved 0 128 8 Reserved 0 256 9 Internal PCB Temperature Out of Tolerance 1 512 10 Reserved 0 1024 11 Reserved 0 2048 12 TEC Temperature Runaway 0 4096 13 Reserved 0 8192 14 Reserved 0 16384 15 Reserved 0 32768 This bit cannot be cleared 09 05 LDT 5980 5948 57 58 Error Messages REMOTE OPERATIONS Error Messages This section contains descriptions of the errors that are specific to the LDT 5900 Testing for Errors in Remote Operation For more information about specific GPIB commands see Chapter 4 Command Reference 1 Send the query ERR to read the system errors Table 3 9 Error Codes Range Area of Operation E 100 to E 199 Command Parser Errors E 200 to E 299 Execution Control Errors E 300 to E 399 Remote Operation Errors E 400 to E 499 TEC Control Errors E 700 to E 799 System Errors E 800 to E 899 Internal Errors Error
45. TIME query returns the power on time of the instrument The response is a single value that represents the power on time of the instrument The maximum time for this register is 1193 02 46 TIME Response 0 32 01 means 32 minutes and one second have elapsed since power on TIMER Action Response Notes Example 112 LDT 5980 5948 COMMON DEVICE DEPENDENT FRONT PANEL The TIMER query returns the elapsed time since the last TIMER command The response is a value that represents the change in time since the last TIMER query TIMER Response 0 12 07 means 12 minutes and 7 seconds have elapsed since the last TIMER query Lightwave COMMAND REFERENCE Command Reference TRIGger IN Co DEVICE DEPENDENT FRONT PANEL The TRIGger IN command path is used to access the input trigger commands The following commands can be reached directly from the TRIGger IN command path See Trigger In section of Chapter 2 for more information TRIGger IN ENABle TRIGger IN STEPsize TRIGger IN ENABle TRIGger IN STEPsize TRIGger IN START TRIGger IN STOP TRIGger IN START TRIGger IN STOP TRIGger IN ENABle Co DEVICE DEPENDENT FRONT PANEL Action The TRIGger IN ENABle command sets enables the trigger input Parameters nrf value that represents the desired setting is required The number 1 represents the input trigger enabled and number 0 represents the input trigger disabled Notes The trigger inp
46. a setpoint to a higher value than the limits Verify lock indicator is not on Press Enter button after adjusting parameter 128 LDT 5980 5948 Lightwave CALIBRATION AND TROUBLESHOOTING Table 5 1 Problem and Action Troubleshooting SYMPTOM CORRECTIVE ACTIONS Output turns off or turns off intermittently Check that the AC power cord connection is secure Power line dropouts may reset the unit and when power is restored the output will be off Check the TE module connections A high impedance on the TE load can cause the output to exceed the compliance voltage momentarily If enabled with GPIB this condition will shut off the output There are other events or conditions that will turn the output off if enabled with GPIB See Output Off Registers in Chapter 3 for more information Check the sensor connections at the module and the load Changing control modes while the output is on will turn the output off Cannot increase current limit to 5A 10A Verify output cable is securely connected to output connector and that the Cable ID jumpers are correct Error Codes The LDT 5900 indicates general TEC operational error conditions on the display or through the GPIB using the ERR command This section contains descriptions of the errors that are specific to the LDT 5900 Front panel Error Indicators When an error occurs the error code and message appears on the front pa
47. all overlapped commands are completed LDT 5980 5948 Lightwave 09 05 COMMAND REFERENCE Command Reference Command Reference The Command Reference presents the commands for remote operation of the LDT 5900 listed in alphabetical order See Command Syntax section in Chapter 3 for detailed instructions about using the commands BEEP COMMC DEVICE DEPENDENT FRONT PANEL Action The BEEP command is used to enable the beep function on or off If enabled the instrument will beep whenever a key is pressed Parameters One lt nrf gt value is required 0 beep off 1 beep on Example BEEP 1 action Turns the beep function on BEEP COMMO DEVICE DEPENDENT FRONT PANEL Action The BEEP query is used to report the state of the beep function Response The returned value is either a 0 or a 1 0 beep off 1 beep on Example BEEP response 1 The beep function is on CAL DEVICE DEPENDENT The CAL root command path is used to access the calibration commands and queries The following commands may be reached from the CAL command path CAL COARSEDAC CAL SENsor VOLTage 1MA CAL COARSEDAC CAL SENsor VOLTage 1MA CAL DEFault CAL SOURCE SENsor 10UA CAL ITE CAL SOURCE SENsor 10UA CAL ITE CAL SOURCE SENsor 100UA CAL RAC CAL SOURCE SENsor 100UA CAL RAC CAL SOURCE SENsor 1MA CAL SAVE CAL SOURCE SENsor 1MA CAL SENsor VOLTage 10UA CAL VTE CAL SENsor VOLTage 10UA CAL VTE CAL SENsor VOLTage 100UA CAL SENsor VOLTage
48. alue possible is determined the by the value set with the LIMit T Hlgh command LIM T LO 40 action sets the lower temperature limit to 40 C Lightwave COMMAND REFERENCE Command Reference LIMit Temp LOw Action Response Notes Example DEVICE DEPENDENT FRONT PANEL The LIMit Temp LOw query returns the value of the lower temperature limit setting The response is a single value that represents the lower temperature limit Low temperature limit is valid for all modes of operation except Rsnsr LIM T LO response 55 0 means the lower temperature limit is 55 0 C LIMit TOLerance DEVICE DEPENDENT FRONT PANEL Action The LIMit TOLerance command sets the controlled setpoint tolerance limit Parameters nrf value that represents the tolerance is required When the controlled quantity temperature sensor current or voltage is within the tolerance window the load is considered in tolerance and trigger out high will be set The tolerance window is defined as the setpoint tolerance limit Notes The range of the tolerance window is 0 to 99 999 The units of this parameter depend on the mode of the instrument In constant temperature mode the units of the tolerance window are in degrees C and constant voltage mode the units are in V in constant sensor mode the units depend on which sensor is selected Amps for ICI Ohms for thermistor and RTD Volts for ICV etc If the tolerance wind
49. are not guaranteed to meet accuracy specifications after this command is issued Accuracy will remain unspecified until calibration is performed on the instrument This is a service related command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section for complete calibration instructions CAUTION The CAL DEFault command resets all of the calibration constants to their default values of 1 for slope and scale factor and 0 for offset thus invalidating the factory calibration Default calibration values are also listed in Chapter 5 Example CAL DEFault The instrument sets all of its calibration constants to their default values 68 LDT 5980 5948 Lightwave 09 05 COMMAND REFERENCE Command Reference CAL ITE COMMO DEVICE DEPENDENT Action The CAL ITE command is used to enter the calibration coefficients for the TE current measurement Notes This is a service related command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section of Chapter 5 for complete calibration instructions Example CAL ITE 10 0 action a slope of 10 and offset of 0 is entered for TE current measurement calibration coefficient CAL ITE Commo DEVICE DEPENDENT Action The CAL ITE query returns the TE current measurement calibration coefficients Response The response will be two values the first re
50. ata is currently selected Decimal binary octal and hexadecimal are allowed Notes DEC is the default type The RADix command is used to select the desired radix Once it is changed the new radix will remain in effect until the unit is power cycled or a new RADix command is issued Example RAD response DEC meaning the selected radix is decimal RCL lt nrf value gt Common Recall Action Recalls a stored setup configuration from memory Parameter A single lt nrf value gt is required The value can range from 0 to 9 Notes Setup 0 has a factory set default configuration as shown in Chapter 2 If you use GPIB to recall setup 0 RCL 0 GPIB mode is set to REMOTE If you recall setup 0 by the front panel GPIB mode is set to LOCAL Same function as RECALL on the front panel Use SAV to store various setup configurations for convenient recall The current setup is automatically stored and recalled at next power ON Examples RCL 0 action recall the factory default setup RST Common Reset hs Action Recalls factory default setup Notes This command is identical in function to RCL 0 Example RST SAV COMMON Action Saves the current setup configuration in memory Response One value in the range of 1 to 9 is required Notes Configuration 0 is reserved for a factory set default configuration See RCL It is normally not necessary to save the current setup for next power ON The current setup is automatically stored for
51. attention to units scalefactor is dimensionless Enable Cal Mode by entering the remote command MODE CAL Enter the new 10 scale factor via the command CAL SOURCE SENsor 10UA scalefactorq Enter the new 100 pA scale factor via the command CAL SOURCE SENsor 100UA scalefactoro Enter the new 1 mA scale factor via the command CAL SOURCE SENsor 1MA scalefactors Save the new values to flash memory by using the CAL SAVE command Return to Sensor Mode by using the MODE SENSOR command Enter the commands CAL SOURCE SENsor 10UA CAL SOURCE SENsor 100UA and CAL SOURCE SENsor 1MA to verify that the factors were stored correctly SENSOR VOLTAGE MEASUREMENT CALIBRATION 6a 6b 6c NOTE The sensor voltage measurement must be calibrated for each thermistor current setting Select 10 A thermistor current from Sensor Parameter Menu Connect the 1 resistor Rsens1a to the sensor leads Connect the DMM across the resistor as well to measure voltage Record voltage Vseng14 across Rsens1a as measured by DMM LDT 5980 5948 123 6d 6e 6f 6g 6h 6i 6j 6k el 6m 6n 60 6p 6q 6r 124 LDT 5980 5948 CALIBRATION AND TROUBLESHOOTING Calibration Procedure Record UUT measured resistance R44 using the MEASure SENsor command Replace 1 resistor with 100 resistor R ens1b and record voltage Vsensib across resistor as measured by DMM Record UUT measured resistance R45 using
52. ave COMMAND REFERENCE Command Reference LIMit VTE LOw Co DEVICE DEPENDENT FRONT PANEL Action The LIMit VTE LOw query returns the value of the lower TE voltage limit setting Response The response a single value that represents the lower voltage limit Notes This limit is only in effect in VTE mode or when bit 7 register 0 of the ENABle OUTOFFis set true Example LIM VTE LO response 4 5 means a lower voltage limit of 4 5V LINEfreq DEVICE DEPENDENT FRONT PANEL Action The LINEfreq command sets the A D convertor line frequency filter to either 50 Hz or 60 Hz Parameters nrf value that represents the line frequency is required Notes Acceptable values are either 50 or 60 For optimal instrument performance and noise rejection select either 50 or 60 Hz depending on your AC input line frequency Example LINE 60 action sets the A D line frequency filter to reject 60 Hz LINEfreq DEVICE DEPENDENT FRONT PANEL Action The LINEfreq query returns the value of the A D convertor line frequency filter Response The response is a single value that represents the filter setting Notes Acceptable values are either 50 or 60 For optimal instrument performance and noise rejection select either 50 or 60 Hz depending on your AC input line frequency Example LINE response 60 means the A D filters are set to reject 60 Hz MEASure DEVICE DEPENDENT The MEAS command path is used to access the measure co
53. ber Condition Decimal Value 0 RAC Measurement Complete 1 1 Reserved 2 2 Output On 4 3 Measurement Within Setpoint Tolerance 8 4 Measurement Out of Setpoint Tolerance 16 5 Reserved 32 6 Reserved 64 7 Reserved 128 8 Reserved 256 9 Internal PCB Temperature Over Limit 512 10 Invalid Calibration Data 1024 11 DSP Reset 2048 12 TEC Temperature Runaway 4096 13 Reserved 8192 14 15V PCB Supply Out of Tolerance 16384 15 Reserved 32768 Event Registers The Event Registers report the temperature controller and sensor events that have occurred since power on or since the previous read of the Event Registers A host controller program must use the EVENT query to access these registers The EVENT query will also clear the contents of the Event Registers The bits of the two 16 bit registers correspond to the bits in the Event Enable Registers shown in Tables 3 5 and 3 6 In most applications the Event Registers are used in conjuncion with the Event Enable Registers to alery an instrument controller on the GPIB bus that a certain condition i e Upper Temperature Limit has occurred The user should first set the desired event bits in the Event Enable Registers using the ENABLE EVENT command Then enable GPIB Service Request generation see the SRE command in Chapter 4 The instrument will then generate a GPIB Service Request SRQ when any of the specified conditions occur Use the EVENT query to determine which ev
54. can verify safe operation Visible damage Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions If necessary return the LDT 5900 Series Temperature Controller to ILX Lightwave for service and repair to ensure that safety features are maintained Follow the Returning an Instrument process described on page xi Poientially lethal voltages exist within the LDT 5900 Series Temperature Controllers To avoid electric shock do not perform any maintenance on the instrument unless you are qualified to do so Qualified service personnel are required to wear protective eye wear and anti static wristbands while working on the LDT 5900 Series circuit boards High voltages and high currents are present on and around the printed circuit boards Lightwave LDT 5980 5948 1 INTRODUCTION AND SPECIFICATIONS Product Overview Product Overview The LDT 5900 Series Temperature Controllers consists of two family members the LDT 5948 60W Precision Temperature Controller and the LDT 5980 120W High Power Temperature Controller These instruments are bi directional current sources with precision measurement circuits to monitor and control the temperature of the device under test They have the following operating characteristics PWM pulse width modulated output power of 60 W for the LDT 5948 5A 12V DC and 120 W for the LDT 5980 10A 12V DC 0 001 C set point
55. cause the output to turn off see Output Off Registers in Chapter 3 Adjust Section The Adjust section of the front panel contains the Adjust Knob and the ENTER LOCK Key See Figure 2 5 The adjust knob digital encoder allows the user to change the value of a selected menu parameter The parameter selected is indicated by brackets 123 456 The ENTER LOCK key is used in menus to enter and store a parameter that has been modified by the knob When not in a menu this key is used to lock disable or unlock the adjust knob 09 05 LOCK The Lock LED will be GREEN when the adjust knob has been locked and is disabled LDT 5980 5948 15 OPERATIONS Front Panel Operation Measurement and Setpoint By default the LDT 5900 Series Temperature Controller displays the temperature measurement from the selected sensor in C Using the DISPLAY MENU arrow keys the user can change the displayed temperature conversion units C F K or the measurement parameter altogether sensor measurement TE current TE voltage TE power After exiting any menu the instrument will always return to the measurement display HINN NDC Lightwave LDT 9XX TEMPERATURE CONTROLLER 025 508 t E DISPLAY MENU TEMP VOLTAGE CURRENT SENSOR TEC LIMIT LIMIT LIMIT ERROR ERROR ENTER LOCK PARAMETER MODE PID AUTO TUNE SYSTEM POWER REMOTE SENSOR LIMITS SAVEIRECALL SELECT SELECT OUTPUT MAIN LOCAL W
56. codes in the Error Queue ESE 1 Enters the value for the Standard Event Status Enable Register ESE none Queries the Standard Event Status Enable Register ESR none Queries the Standard Event Status Register EVENT none Queries the contents of the Event Registers IDN none Returns the device identification information KEY 1 Initiates a front panel key press or knob turn LIMit ITE HIgh 1 Enters the upper TE current limit setting LIMit ITE HIgh none Queries the upper TE current limit setting LIMit ITE LOw 1 Enters the lower TE current limit setting 09 05 LDT 5980 5948 63 4 COMMAND REFERENCE GPIB Commands Table 4 1 GPIB Command Summary Reference List NAME Parameters FUNCTION LIMit ITE LOw none Queries the lower TE current limit setting IMit SENsor HIgh 1 Enters the upper sensor limit setting IMit SENsor HIgh none Queries the upper sensor limit setting IMit SENsor LOw 1 Enters the lower sensor limit setting IMit SENsor LOw none Queries the lower sensor limit setting LIMit Temp HIgh 1 Enters the upper temperature limit setting LIMit Temp HIgh none Queries the upper temperature limit setting LIMit Temp LOw 1 Enters the lower temperature limit setting LIMit Temp LOw none Queries the l
57. crement right Key 11 gt Dial decrement left Example KEY 5 action initiates a key press for the Parameter Select button LIMit ITE COMMON DEVICE DEPENDENT The LIMit ITE command path is used to access the ITE limit commands The following commands may be reached directly from the LIMit ITE command path LIMit ITE HIgh LIMit ITE HIgh LIMit ITE LOw LIMit ITE LOw LIMit ITE HIgh COMMON DEVICE DEPENDENT FRONT PANEL Action The LIMit ITE HIgh command sets the upper TE current limit value Parameters An nrf value that represents the upper limit current in Amps Notes Maximum current limit is dependent on the instrument model and the cable type Example LIM ITE HI 4 0 action the upper current limit is set to 4 0 A 90 LDT 5980 5948 Lightwave COMMAND REFERENCE Command Reference LIMit ITE HIgh DEVICE DEPENDENT FRONT PANEL Action The LIMit ITE HIgh query returns the value of the upper TE current limit value Response The response is a single value that represents the upper current limit Notes The current limit is in effect in all control modes Example LIM ITE HI response 0 9 means the upper current limit is 0 9 A LIMit ITE LOw Co DEVICE DEPENDENT FRONT PANEL Action The LIMit ITE LOw command sets the lower TE current limit value Parameters An nrf value that represents the lower limit current in Amps Notes Maximum current limit is dependent on the instrument m
58. d RS 232 at the same time When using the RS 232 interface the remote GPIB command set is fully operable Command syntax does not vary between GPIB and RS 232 usage However the commands which affect GPIB hardware operation will not be useful For example the user could send the SRE command via RS 232 However any service request SRQ via GPIB would not be visible since RS 232 has no hardware to support it This is because SRQ is a function of the GPIB interface hardware and is not available via RS 232 All commands received by the RS 232 interface are acknowledged by the LDT 5900 transmitting Ready when the command operation is complete Queries are acknowledged by the specific query response message Multiple commands queries separated by semicolons and issued as one command string are only acknowledged with a Ready response if the entire command string contains no queries See the Command Separators section later in this chapter for additional details The LDT 5900 terminates all RS 232 transmitted responses with lt CR gt lt LF gt Carriage Return Line Feed characters The LDT 5900 expects all commands queries sent via the RS 232 interface to be terminated with any of the following characters CR Carriage Return lt LF gt Line Feed or ASCII 250 character Hex OxFA Command Syntax This section describes command syntax and structure You need this information to effectively write GPIB or RS 232 control programs The
59. data in non volatile memory CAL SENsor VOLTage 10UA 2 Enters the temperature sensor voltage calibration coefficients for the 10 uA current setting CAL SENsor VOLTage 10UA none Queries the temperature sensor voltage calibration coefficient for the 10 uA current setting CAL SENsor VOLTage 100UA 2 Enters the temperature sensor voltage calibration coefficients for the 100 uA current setting CAL SENsor VOLTage 100UA none Queries the temperature sensor voltage calibration coefficient for the 100 uA current setting CAL SENsor VOLTage 1MA 2 Enters the temperature sensor voltage calibration coefficients for the 1mA current setting CAL SENsor VOLTage 1MA none Queries the temperature sensor voltage calibration coefficient for the 1 mA current setting CAL SOURCE SENsor 10UA 1 Enters the 10 uA sensor current calibration coefficient CAL SOURCE SENSOr 10UA none Queries the 10 uA sensor current calibration coefficient CAL SOURCE SENSOr 100UA 1 Enters the 100 uA sensor current calibration coefficient CAL SOURCE SENsor 100UA none Queries the 100 uA sensor current calibration coefficient CAL SOURCE SENsor 1MA 1 Enters the 1 mA sensor current calibration coefficient 62 LDT 5980 5948 Lightwave COMMAND REFERENCE GPIB Commands Table 4 1 GPIB Command Summary Reference List
60. deed eed ae desse d dad 15 Measurement and 16 System Section 00 000 ct eee 17 System Menu snae rente ede eda RR ohne new Dus uc forslag 17 Parameter Section xs ua eae ek ra hk a OE ee od 21 PID AULQ TUNE 9b RR Rx Rm PERRO OR AR 22 Auto Tune Operation 23 Modifying the PID 25 SENSOR eo new e p OL Re dete a een nee oak awe 26 LIMITS er 27 SAVE REGALL peer asada e k em ba Ue ee ae fe ea 28 Mode Section i5 sue Rn a see k eek CR Gu ale hud 29 EE 30 rc teser 30 Me Waa tie ised yt acc ee 30 De SEERE RA EN 31 Basic TEC Operation Instructions 33 General Guidelines for Sensor Selection and Safety Limits 34 Sensor Options de eda Vids bead veu 34 Setting Safety Limits 37 Default Settings 39 ii LDT 5980 5948 Lightwave Chapter 3 Remote Operations Remote Configuration 41 GPIB 41 Reading the GPIB Address 41 Changing the GPIB Address 41 RS 232 Confi
61. e represented by any of the following ASCII strings Integer 20 20 NR1 Floating point 20 0 20 0 NR2 Scientific notation 2 0E 1 2 0E 1 NR3 2 0e 1 2 0e 1 There are no default values for omitted parameters If a command is expecting a parameter and none is entered an error is generated LDT 5980 5948 45 46 LDT 5980 5948 REMOTE OPERATIONS Resolution All queries to the LDT 5900 Series Temperature Controllers that return a numerical value will have nine 9 significant degits to the right of the decimal point For further clarity in programming the Boolean values of one 1 and zero 0 may be used or their names as indicated in the following table Table 3 1 Substitute Parameter Names SUBSTITUTE NAME VALUE ON 1 OFF 0 TRUE 1 FALSE 0 SET 1 RESET 0 If multiple parameters are expected they must be separated with commas For example to set the Steinhart Hart constants C1 C2 and C3 for a thermistor the following command may be sent CONST THERM 1 111 2 004 Lightwave root REMOTE OPERATIONS Remote Communication Table 4 1 on page 31 lists the LDT 5980 5948 commands with the full path shown for each command and a brief explanation of its usage CLS ESE ESE ESR IDN OPC PSC PSC PUD RCL RST SAV SRE SRE STB TST WAI 09 05 BEEP BEEP DELAY DISPLAY DISPLAY ERR EVENT
62. e High Temperature setting the LDT 5900 turns off the TEC current and generates an error Using GPIB you can disable the high temperature limit from turning off the controller See Chapter 3 Output Off Registers and Chapter 4 Command Reference for more information about disabling or enabling conditions that turn off the controller 38 LDT 5980 5948 Lightwave Default Settings When you select Default from the Recall menu the LDT 5900 Series Temperature OPERATIONS Basic TEC Operation Instructions Controller returns to the following settings Output Off Mode Constant Temperature Temperature Setpoint 25 C TEC Current Setpoint 1 0A Current Limit High 2 5A Current Limit Low 2 5A Temperature Limit High 60 C Temperature Limit Low 0 C Resistance Setpoint 10 P D 20 0 8 1 0 Sensor Thermistor Voltage Limits 12 0V Tolerance 0 005 Sensor Limits 0 010 100 0 Display 100 Beep On Trig In Disabled Start 0 C Stop 60 C Step 1 C Trig Out Delay 0 0 sec Sensor Current 100 uA C1 1 125 x 10 3 C2 2 347 x 10 4 C3 0 855 x 10 7 Retrieving Default Settings See Chapter 3 Remote Operations for remote execution of the Save and Recall functions 1 Select Sav Rec to access the Save Recall Config menu 2 Recall 0 contains the factory default settings LDT 5980 5948 3
63. e SAVE RECALL menu Using the knob adjust the value to the desired configuration bin number Press the ENTER LOCK key to recall the saved user settings After the recall is completed the LDT 5900 will immediately be configured to the desired settings However the OUTPUT will be turned off When the LDT 5900 is manufactured all of the usable recall bins are initialized to the default values They will remain that way until the user performs a SAVE operation on a particular bin Mode Section The three important areas of the Mode section are the OUTPUT key the SELECT key and the mode indicators Mode Indicators T RSNSR SL ITE VTE Rac a The OUTPUT key is used to turn the controller output current on or off The OUTPUT is off when the instrument is first powered up It may also be shut off automatically during operation if certain error or out of limit conditions occur See Chapter 3 Output Off Registers Turning OUTPUT on enables temperature or other mode control of the TEC The SELECT key may be pressed repeatedly to cycle through the various modes The modes that can be selected here are constant temperature T constant resistance Rsnsr constant current l7g constant voltage Vrg and AC resistance mode Rac Once a mode is selected the setpoint for that mode is displayed for 10 seconds If the setpoint is already at the desired value the setpoint entry menu can be exited by pressing either the up or down arrow
64. e temperature setting is 17 3 C SET VTE DEVICE DEPENDENT FRONT PANEL Action The SET VTE command sets the constant TE voltage setpoint Parameter An nrf value that represents the constant voltage setpoint in Volts is required Notes This setting is always stored but is only used when the instrument is in VTE mode Example SET VTE 1 75 action sets the VTE setpoint to 1 75V SET VTE COMMC DEVICE DEPENDENT FRONT PANEL Action The SET VTE query returns the constant TE voltage setpoint Response The response is a single value that represents the constant voltage setpoint value in Volts Notes This setting is only in effect when the instrument is in VTE mode Example SET VTE Response 2 75 means sets the VTE setpoint is 2 75V 108 LDT 5980 5948 Lightwave COMMAND REFERENCE Command Reference SRE lt nrf value gt Service Request Enable COMMON DEVICE DEPENDENT FRONT PANEL Action Enables bits in the Service Request Enable Register Parameter The value must be between 0 and 255 Numeric Value ENABIe EVENT Summary 1 Message Available MAV 16 ESE Event Summary ESB 32 ERR Error Log Available 128 Unused bits Notes Setting bits in this register enables GPIB Service Request SRQ generation Example SRE 128 Enables SRQ generation if the Error Log contains data errors SRE COMMON Service Request Enabled DEVICE DEPENDENT FRONT PAN
65. e user to select the appropriate remote communications and appears as follows COMMUNICATION 17 7 GPIB Addr 01 MENU For GPIB communications the GPIB address can be set between 0 and 30 by using the adjust knob to select the desired value and then pressing the ENTER LOCK key to save it By pressing the down arrow key the RS 232 baud rate is 09 05 LDT 5980 5948 17 OPERATIONS Front Panel Operation selected and can be set between a minimum of 1200 and a maximum of 230400 For more information on remote communications see Chapter 3 GPIB Addr 01 RS232 Baud 9600 MENU Display The second page of the system menu allows the user to set the brightness of the display between 2596 and 10096 by using the adjust knob and then pressing the ENTER LOCK key DISPLAY 2 7 Brightness 62 MENU Error Log The third page of the system menu allows the user to view the error log and appears as follows when no errors are present Pressing the ENTER LOCK key clears the error log The DISPLAY MENU up and down arrow keys scroll thru the error log which lists the most recent error at the top Table 3 7 in Chapter 3 lists the error codes for the LDT 5900 Series Temperature Controllers ERROR LOG 3 No Errors MENU 18 LDT 5980 5948 Lightwave OPERATIONS Front Panel Operation Buttons The fourth page of the system menu allows the user to set the beep for the buttons either on or of
66. ed value is either a 0 or a 1 0 Display off 12 Display on Example DISP response 1 The display is turned on ENABle EVENT DEVICE DEPENDENT Action The ENABle EVENT command sets the controller Event Enable Registers The bits in these registers specify the conditions that will cause a GPIB Service Request Parameters Two lt nrf values gt that represent the sum of the enabled bits for each register The first represents the sum of the enabled bits for register 1 and the second represents the sum of the enabled bits for register 0 e g ENAB EVENT Reg 1 gt Heg 0 gt Event Enable Register 1 Bit Number Condition Default Value Decimal Value 0 RAC Measurement Complete 0 1 1 Reserved 0 2 2 Output On 0 4 3 Measurement Within Setpoint Tolerance 0 8 4 Measurement Out of Setpoint Tolerance 0 16 5 Reserved 0 32 6 Reserved 0 64 7 Reserved 0 128 8 Reserved 0 256 9 Internal PCB Temperature Over Limit 0 512 10 Invalid Calibration Data 0 1024 11 DSP Reset 0 2048 12 TEC Temperature Runaway 0 4096 13 Reserved 0 8192 14 15V PCB Supply Out of Tolerance 0 16384 15 Reserved 0 32768 78 LDT 5980 5948 Lightwave Notes Examples COMMAND REFERENCE Command Reference Read these registers using the ENABIe EVENT query The factory default values for these registers are both 0 nothing enabled The registers will be reset to zero at power on if P
67. election depends on the thermistor operating temperature range and the required temperature resolution A general rule of thumb for a 10 thermistor is to use the 10 uA range for temperatures between 30 C and 30 C and the 100 uA range for temperatures between 10 C to 70 C Select the thermistor sense current of 10 or 100 uA through the front panel sensor menu Using 10 uA as the sense current allows you to use a maximum thermistor resistance of 600 The 100 pA setting allows a 60 maximum To ensure proper current and thermistor selection certain principles must be considered To ensure measurement accuracy the voltage across the thermistor must not exceed 6 V To improve control responsiveness and accuracy the thermistor voltage variations that result when the load temperature deviates from the setpoint must be as large as possible The importance of maximizing voltage variation is shown in Figure 2 7 which shows resistance as a function of temperature for a thermistor The values shown were selected for simplicity in this example and may not reflect real thermistor values In the example shown in Figure 2 7 the thermistor resistance is 25 kQ at 20 C Deviations of 1 C from 20 C cause resistance variations of about 2 If using the 10 uA setting there is 20 mV of feedback to the control circuit Using the 100 uA setting provides 200 mV of feedback The larger feedback signal means that the tem
68. ence OPC COMMON Operation Complete Query Action Queries the status of all pending overlapped command operations Response The response is a single value A 1 indicates all overlapped commands are complete A 0 indicates overlapped commands are not complete Notes This instrument has no overlapped commands Example OPC response 1 means that commands are complete OUTPUT COMM DEVICE DEPENDENT FRONT PANEL Action The OUTPUT command turns the controller output to the TEC on or off Parameters nrf value 1 on 0 off Notes After the TEC output is turned on it may be useful to wait until the output is stable before performing further operations but it is not necessary The character strings OFF and ON may be used in place of 0 and 1 Examples OUTPUT 1 action turns the output on OUTPUT OFF action turns the output off OUTPUT Col DEVICE DEPENDENT FRONT PANEL Action The OUTPUT query returns the controller output state Response The response is a value that represents the output state Notes Although the output is on the output may not have reached the set point value The output should always be off when connecting or disconnecting cables to the output connector Examples OUTPUT response 0 means that the TEC is off OUTPUT response 1 means that the TEC is turned on PID DEVICE DEPENDENT Action The PID command is used to set the PID constant for the instrument Parameters Three n
69. endent upon which sensor is selected For thermistor or RTD the value will be in ohms ICI in Amps ICV in Volts Example MEAS SEN response 0 0001323 means the measured sensor value is 132 3 pA if instrument sensor is set for ICI Note Returned values will be displayed in native units MEASure Temp DEVICE DEPENDENT Action The MEASure Temp query returns the measured value of the temperature sensor Response The response is a single value that represents the measured temperature in degrees Celsius Notes The response is the measured temperature regardless of control mode Example MEAS T response 45 6 means the measured temperature is 45 6 C MEASure VTE COMMC DEVICE DEPENDENT Action The MEASure VTE query returns the measured value of the TE voltage Response The response is a single value that represents the measured TE voltage in Volts Notes The response is the measured output voltage regardless of control mode Example MEAS VTE response 4 2 means the measured output current is 4 2V 100 LDT 5980 5948 Lightwave 09 05 COMMAND REFERENCE Command Reference MESsage DEVICE DEPENDENT Action Stores an ASCII string into non volatile memory Parameters String is 1 to 15 non zero ASCII characters Strings longer than 15 characters will generate an error The message should be contained within Notes Useful as a scratchpad for storing intermediate test status or configuration informa
70. ent s caused the SRQ The user must clear the Event Registers with the EVENT query to re enable SRQ generation for the nabled eveni s 52 LDT 5980 5948 Lightwave REMOTE OPERATIONS Status Reporting The Event Registers bits are set and if enabled the SRQ is generated only when the enabled event condition transitions from the false state to the true state For example if the Upper Temperature Limit event bit is enabled the SRQ will be generated when the measured temperature goes from in limit to over limit If the measured temperature stays over limit after the event is acknowledged by clearing the Event Registers with the EVENT query the next SRQ will only be generated after the temperature returns to the in limit state and then again goes over limit It is not necessary to enable event bits using the ENABLE EVENT command to use the Event Registers The EVENT query will return the correct state of the event bits regardless of which bits are enabled in the Event ENable REgisters Only the generation of Service Requests and the state of the summary bit in the STB Register see Chapter 4 are affected by the ENABLE EVENT command 09 05 LDT 5980 5948 53 REMOTE OPERATIONS Status Reporting Table 3 5 LDT 5900 Event Register Contents Event Register 0 Value 1 Event is enabled Value 0 Event is disabled Bit Number Condition Default Value Decimal Value 0 Up
71. ently selected control mode e g Temperature is within the specified setpoint tolerance This is a TTL signal generated by the instrument with programmable delay The signal is low when the measurement is out of the tolerance window and high when within the tolerance window For more details on trigger functionality see Front Panel Operations in this chapter High when measurement within tolerance window Low when measurement out of tolerance window Figure 2 3 Trigger Out LDT 5980 5948 uix Lightwave OPERATIONS Rear Panel Overview i GPIB Connector The GPIB interface connector is located in the upper left corner of the rear panel Refer to Figure 2 2 The 24 pin GPIB interface connector is tapered to ensure proper orientation Finger tighten the two screws on the cable connector A total of 15 devices can be connected together on the same GPIB interface bus The cables have single male female connectors on each end so that several cables can be stacked This permits more than one cable to be attached to any one device The maximum total length of the GPIB cables must not exceed 20 meters 65 feet or 2 meters 6 5 feet time the total number of devices on the bus The maximum individual cable length must not exceed 4 meters 13 feet For more information regarding GPIB communications see Chapter 3 RS 232 Connector The RS 232 connector is located under the GPIB interface connector This is a standard female DB 9 connect
72. es of the auto tune process will range from 10 to 45 minutes or more depending on the thermal system being tuned Typical tuning times are around 25 minutes Thermal systems with higher P and D coefficients will take more time to tune than those with lower P and D coefficients To utilize this feature Connect the temperature controller to the desired thermal load Verify the current limits and temperature set point are set appropriately for the particular TEC Press the Parameter SELECT button to activate the PID AUTO TUNE parameter Auto Tune should be highlighted with brackets Ifthe status from a previous Auto Tune is shown next to the Auto Tune selection i e Success or Failed press the ENTER LOCK key to clear it Press the ENTER LOCK key to begin um LX Lightwave LDT 59xx TEMPERATURE CONTROLLER Auto Tune 4 00020 00 LOCK DISPLAY MENU TEMP VOLTAGE CURRENT SENSOR TEC 4 LIMIT LIMIT LIMIT ERROR ERROR ENTER LOCK SYSTEM PARAMETER PID AUTO TUNE MODE POWER REMOTE SENSOR LIMITS SAVE RECALL MAIN LOCAL SELECT SELECT While Auto Tune is in process the PID AUTO TUNE LED will be flashing and the thermal system s temperature will be displayed Once an Auto Tune is complete the instrument will then beep and disable the output and the display will read AutoTune Success The instrument will automatically enter the new P and D values from a
73. esents the upper temperature limit in degrees Celsius Notes By default the controller output is turned off when the measured temperature exceeds this setting This feature can be disabled by clearing bit 0 in the Output Off Enable Register 0 using the ENABle OUTOFF command The maximum value possible for the upper temperature limit is 250 0 C The absolute minimum value possible is determined the by the value set with the LIMit Temp LOw command Example LIM T HI 105 0 action sets the high temperature limit to 105 0 C LIMit Temp HIgh Co DEVICE DEPENDENT FRONT PANEL Action The LIMit Temp Hlgh query returns the value of the upper temperature limit setting Response The response is a single value that represents the upper temperature limit Notes High temperature limit is valid for all modes of operation except Rsnsr Examples LIM T HI response 92 0 means the high temperature limit is 92 0 C LIMit Temp LOw Action Parameters Notes Example DEVICE DEPENDENT FRONT PANEL The LIMit Temp LOw command sets the lower temperature limit value An nrf value that represents the lower temperature limit in degrees Celsius By default the controller output is turned off when the measured temperature falls below this setting This feature can be disabled by clearing bit 0 in the Output Off Enable Register 0 using the ENABle OUTOFF command The minimum value possible for the lower temperature limit is 50 0 C The absolute maximum v
74. f by using the adjust knob and then pressing the ENTER LOCK key BUTTONS 4 7 Beep Off VERU Trigger In The fifth page of the system menu allows the user to set up all parameters for the trigger in functionality From this menu the trigger in can be enabled or disabled TRIGGER IN 5 7 Enable False MENU Pressing the down arrow key scrolls through the various parameters within this menu allowing the user to then set the start stop and step temperatures Start 000 000 Stop 060 000 C MENU When enabled the Trigger In feature allows the user to modify the temperature control setpoint by sending a TTL pulse into the TRIG IN BNC connector on the back of the instrument See the Rear Panel Overview section earlier in this chapter for connector location The first time a Trigger In pulse is received the temperature setpoint will be set to the Start temperature specified in this menu Subsequent pulses will increment or decrement the setpoint by the Step value 09 05 LDT 5980 5948 19 OPERATIONS Front Panel Operation When the setpoint reaches the specified Stop temperature the next pulse will reset the setpoint back to the Start temperature The setpoint cannot exceed the Stop temperature and any attempt to step beyond the Stop temperature will instead reset the setpoint back to the Start temperature Trigger Out The sixth page of the system menu allows the user to set up the trigger out dela
75. ger IN STEP size command sets the temperature step size Parameters nrf value that represents the desired temperature step size is required in Valid step size values range from 100 C to 100 C Notes To increase temperature from the starting point a positive step size must be entered To decrease temperature from the starting point a negative step size must be entered Example TRIG IN STEP 1 505 action Sets the temperature step size to 1 505 C increments TRIGger IN STEP Con DEVICE DEPENDENT FRONT PANEL Action The TRIGger IN STEP query returns the value of the temperature step size Response The response is a single value that represents the temperature step size in C Notes Example TRIG IN STEP response 1 505 means the temperature step size is 1 505 C TRIGger IN STOP Co DEVICE DEPENDENT FRONT PANEL Action The TRIGger IN STOP command sets the stopping temperature setpoint Parameters nrf value that represents the desired stopping temperature setting is required in 9C Notes Valid input range is limited to the settings for LIM TEMP HI and LIM TEMP LO If a trigger is sent after the stop temperature is reached the temperature will return to the starting temperature Example TRIG IN STOP 40 action Sets the stopping temperature setpoint to 40 C 114 LDT 5980 5948 Lightwave COMMAND REFERENCE Command Reference TRIGger IN STOP Co DEVICE DEPENDENT FRO
76. ghtwave 09 05 OPERATIONS Basic TEC Operation Instructions Ry Resistance Q at temperature T C T Temperature in C The A B and C are derived from resistance measurements at 0 100 C and 260 C and are defined as follows a a 6 100 a 8 100 Creo a 8 100 where a Rigg Ro 100 Constant for T lt 0 C 8 Ro 1 a 260 Rogo 4 16 Ro a For temperatures greater than 0 C the 5900 controller derives the temperature by solving the following quadratic equation T RoA Ro A 4 RoB Ro Rr These sensor coefficients A B C and Rg are required for the LDT 5900 to accurately report the temperature when utilizing an RTD sensor Typical RTDs have a nominal resistance Rg of 100 or 1000 ohms Common Callendar Van Dusen constants are listed below and are used as default values in the LDT 5900 e A 9C 3 908 x 103 B 9C 5 775 x 107 C 9C 4 183 x 101 For optimal accuracy and stability the 1mA current source should be selected for RTD sensors with resistance of 1 to 6000 ohms In general the change in resistance per change in temperature is much lower for a typical 100 RTD than that of a typical 10 ko thermistor The proportional and integral terms for the PID loop must be increased appropriately when using an RTD sensor for optimal setting time and stability Setting Safety Limits TEC modules can be damaged by excessive c
77. guration s ec isasun eee 42 Reading the Baud Rate 42 Changing the Baud Rate 42 Remote Communication 43 Changing Operation from Local to Remote 43 GPIB Versus RS 232 Communication 43 Command Syntax 000 tees 43 Letters UA a MERE bee ees 44 White Space iu uudese eee sad Grisen dante a ee bl sk 44 Terminators ete a s mdr eda 45 Command Separators 45 Parameters i Ju does ke ver Oe RA we Rea GEK 45 Resolution soss ssi RR mn eee CE m RR Ne 46 Syntax Summary 48 IEEE 488 2 Common 49 Command Timing 12 vs aed ee reek UR Ad dee Lae 49 Sequential Overlapped Commands 50 Query Response Timing 50 Status Reporting occ aar cee eee bee ad ERE E age 51 Status Registers eet eee 51 Event Registers eee unne 52 Output Off Registers 55 Error Messages ores teeta deed a rede des eed deed
78. he following parameters Temperature High Low Limits VTE TE Voltage High Low Limits ITE TE Current High Low Limits Set Point Tolerance for Trigger Out Sensor High Low Limits When the limit parameter is selected the display will look as follows Mm NLX Lightwave LDT 59xx TEMPERATURE CONTROLLER Temp High 060 000 4 Temp Low 000 000 Se TEMP VOLTAGE CURRENT SENSOR TEC 4 LIMIT LIMIT LIMIT ERROR ERROR ENTER LOCK SYSTEM PARAMETER PID AUTO TUNE MODE POWER REMOTE SENSOR E LiMITS MAINILOCAL SAVEREGALL SELECT SELECT When these limits are exceeded the corresponding LIMIT or ERROR LED in the Display Section is illuminated AlsO exceeding these limits may cause the controller output to be turned off automatically See the Output Off Registers section in Chapter 3 09 05 LDT 5980 5948 27 OPERATIONS Front Panel Operation SAVE RECALL The Save Recall menu functions are used to quickly configure the LDT 5900 Series Temperature Controller s parameters to user determined pre set values IN IL Lightwave LDT 59xx TEMPERATURE CONTROLLER Save Il 4 LOCK Re ca 1 1 0 DISPLAY MENU TEMP VOLTAGE CURRENT SENSOR TEC 4 LIMIT LIMIT LIMIT ERROR ERROR ENTER LOCK SYSTEM PARAMETER PID AUTO TUNE MODE POWER REMOTE SENSOR LIMITS Wl SAVE REGALL SELECT SELECT OUTPUT MAIN LOCAL SAVE The Save function is used to store the cur
79. hilte the measurement display is active the user can access and change the setpoint for the selected control mode See the Mode Section later in this chapter for details on control modes and setpoints Turning the adjust knob will cause the screen to switch from displaying the measurement to displaying the setpoint This is indicated by brackets around the setpoint value The setpoint value can then be adjusted with the knob and stored by pressing the ENTER LOCK key After 10 seconds of inactivity the screen will switch back to display the measurement or the user can press either DISPLAY MENU arrow key to immediately switch back to the measurement display 16 LDT 5980 5948 Lightwave OPERATIONS Front Panel Operation System Section The System section of the front panel contains the MAIN LOCAL button and the REMOTE indicator Sending a command over the GPIB or RS 232 interfaces automatically puts the instrument in Remote Mode and illuminates the Remote LED The MAIN LOCAL button returns the instrument to local front panel control See the Remote Communication section of Chapter 3 for more details System Menu Pressing the Main Local Key cycles through the system menu as described in further detail below System menu entry will automatically timeout after 10 seconds of no activity and the instrument will return to is default measurement display mode Communication The first page of the system menu allows th
80. iently capture and record calibration data An original certificate of calibration authenticity is provided with all instrument calibrations and a detailed report showing any pre calibration out of tolerance conditions is available upon request Calibration turn times are normally five business days or less On site calibrations can be performed around your production schedule night or day seven days a week Please contact ILX Customer Support see Comments Suggestions and Problems on page xii for contact information for additional calibration information For further assistance with technical solutions and troubleshooting visit the www ilxlightwave com Support Library for Application Notes and Technical Notes Lightwave LDT 5980 5948 117 CALIBRATION AND TROUBLESHOOTING Calibration Calibration Several calibrations must be performed to fully calibrate the LDT 5948 and LDT 5980 These calibrations consist of adjustments to the Analog to Digital and Digital to Analog Converters for the TE Voltage Sensor TE Current Sensor bipolar TE output current Temperature Sensor output current and Temperature Sensor voltage measurement Calibrate the unit every 12 months or whenever performance indicates recalibration is required Signs that calibration may be required include differences between set point and measurement display values that exceed the accuracy specification Calibrate the unit in a normal laboratory temperature
81. isplays the Communications menu The GPIB Address can be changed by turning the adjust knob until the desired address value is displayed and then press the ENTER LOCK key The new GPIB address will then be stored in non volatile memory The allowable address range is 0 30 I b Lightwave LDT 5980 5948 41 REMOTE OPERATIONS 2 Remote Configuration RS 232 Configuration Before you can operate the LDT 5900 Series Temperature Controller over RS 232 you need to select the baud rate The instrument s baud rate setting must match the baud rate used by the host controller serial RS 232 interface which is typically a serial COMM port on your PC The following sections describe reading and changing the baud rate The LDT 5900 Series Temperature Controller s RS 232 is configured for 8 bit no parity no flow control and one stop bit This is not adjustable Only the baud rate may be altered Reading the Baud Rate Press the MAIN LOCAL key in the system section of the front panel to view the System Menu Page 1 of the System Menu is the Communications Menu Press the down arrow key and the RS 232 baud rate will be displayed Changing the Baud Rate The factory default baud rate is 9600 The allowable baud rates are 1200 2400 4800 9600 19200 38400 57600 115200 and 230400 Refer to the serial port configuration of your PC if used for the allowable baud rates If itis necessary to change the baud rate press the M
82. ister 0 respectively Event Enable Register 1 Bit Number Condition Default Value Decimal Value 0 RAC Measurement Complete 0 1 1 Reserved 0 2 2 Output On 0 4 3 Measurement Within Setpoint Tolerance 0 8 4 Measurement Out of Setpoint Tolerance 0 16 5 Reserved 0 32 6 Reserved 0 64 7 Reserved 0 128 8 Reserved 0 256 9 Internal PCB Temperature Over Limit 0 512 10 Invalid Calibration Data 0 1024 11 DSP Reset 0 2048 12 TEG Temperature Runaway 0 4096 13 Reserved 0 8192 14 15V PCB Supply Out of Tolerance 0 16384 15 Reserved 0 32768 Notes These registers can be set by using the ENABle EVENT command Examples ENAB EVENT response 0 8 means that the Sensor Short is the only condition that will 80 LDT 5980 5948 cause a GPIB Service Request Lightwave 09 05 COMMAND REFERENCE Event Enable Register 0 Command Reference Bit Number Condition Default Value Decimal Value 0 Upper Temperature Limit 0 1 1 Lower Tempature Limit 0 2 2 Sensor Open 0 4 3 Sensor Shorted 0 8 4 TEC Current Upper Limit 0 16 5 TEC Current Lower Limit 0 32 6 TEC Voltage Upper Limit 0 64 7 TEC Voltage Lower Limit 0 128 8 TEC Open 0 256 9 TEC Shorted 0 512 10 Auto Tune in Progress 0 1024 1 Sensor Upper Limit 0 2048 12 Sensor Lower Limit 0 4096 13 3V PCB Supply Out of Tolerance 0 8192 14 5V PCB Supply Out
83. itive current Sensor current 10 uA 100 uA or 1 mA flows through the sensor connected at RT pin 15 and RT pin 14 A voltage develops across the temperature sensor connected to these pins and can be accurately measured at the sensor through the 4 wire voltage sense pins 1 and 2 RT Sense and RT Sense Similarly the TE voltage can be accurately measured through the 4 wire TE voltage sense pins 7 and 8 The sensor input pins 14 and 15 as well as the RT sense and TEC sense pins 1 2 7 and 8 should be floating with respect to ground Pin 6 is connected to the chassis which is connected to earth ground via the AC power cord earth conductor ILX recommends using either the CC 591H 5900 TE Controller unterminated 10A interconnect cable or the CC5955 TE Controller Laser Diode Mount 5A interconnect cable to connect the module to the load The CC 59X Series cables are specifically designed to be compatible with the 5900 Series Temperature Controllers See the ILX Lightwave product catalogue or contact ILX Customer Service see page xii for contact information for information about the cable Note If you choose to assemble your own interconnect cables 18AWG wire is recommended to minimize voltage drop at high current Note that the DB 25 connector pins are rated for Inominal 2 5A and thus all four TEC pins 9 10 21 22 must be used if 10A is to be delivered to a load as well as all 4 TEC pins 12 13 24 25 for the return Als
84. itude lt 15 mA A small positive current lp is input to the module for time T and the output voltage Vpi across the TE is measured with an ADC The current is then reversed at the same amplitude In for time T and the output voltage Vn across the TE is again sampled by the ADC The TE resistance Rag is then calculated with the following formula gt Vpi Ip Y Vni In Rac 5 i 1 10 i 1 10 i 10 i 10 09 05 LDT 5980 5948 31 OPERATIONS Front Panel Operation HO HL Lightwave LDT 59xx 001 5243 VOLTAGE LIMIT TEMP LIMIT CURRENT LIMIT SYSTEM POWER REMOTE MAIN LOCAL TEMPERATURE CONTROLLER 4 DISPLAY MENU LOCK SENSOR TEC 4 NG P ENTER LOCK ERROR ERROR PARAMETER PID AUTO TUNE MODE SENSOR LIMITS SAVE RECALL SELECT SELECT To activate this feature press the OUTPUT key The instrument will measure and display the resistance of the TE module and then turn output off 32 LDT 5980 5948 Lightwave OPERATIONS Basic TEC Operation Instructions Basic TEC Operation Instructions This procedure is for basic setup and operation of the LDT 5900 Series Temperature Controllers See General Guidelines for Sensor Selection and Safety Limits for detailed information about the specific sensors and control parameters 1 Connect the appropriate output cable either the CC595S or the CC591H to the 25 pin D sub connector at the back of
85. kQ Accuracy 0 08 0 6 Q Range 12 000 to 12 000 V 12 000 to 12 000 V Resolution 1 mV 1mV Accuracy 10 mv 10mV AC Resistance Measurement Waveform Pseudo AC Pseudo AC Amplitude 10 mA 10 mA Accuracy 1 0 01 0 1 0 01 2 SYNCHRONIZATION LDT 5948 LDT 5980 Trigger In Type TTL rising edge triggered Resolution 100 us Trigger Out Type TTL active high Jitter 5 ns Delay Programmable 1ms to 60 seconds Resolution 1ms LDT 5980 5948 Lightwave INTRODUCTION AND SPECIFICATIONS Specifications GENERAL LDT 5948 LDT 5980 Output Connectors TEC I O Female 25 pin D sub GPIB IEEE 488 RS 232 Female 9 pin D sub Trigger In BNC Trigger Out BNC Power Requirements 90 260V at 50 60 Hz Size 3 5 x 7 3 x 12 Weight 10 0 pounds 4 5 kg Ambient Temperature Range Operating 10 to 40 C Storage 40 to 70 C Humidity 85 relative non condensing Warm up Five 5 minutes to rated accuracy EMC EN 61326 1 2000 CE Requirements Safety EN 61010 1 2001 73 23 EEC 93 68 EEC All values relate to a five minute warm up period 2 Software limits of range Actual range possible depends on the physical load thermistor type and TEC module used 3 Accuracy figures are set point referenced and represent the uncertainty that the 5948 5980 adds to the measurement This figure does not include the sensor uncertaintie
86. l mail list access list failed 851 Unknown TEC ID command 854 Invalid UART ID 855 UART transmit buffer overflow 856 UART receive buffer overflow LDT 5980 5948 Lightwave CHAPTER COMMAND REFERENCE El a E El w Li E B E a a E a This chapter is a reference for all of the remote GPIB and RS 232 commands for the LDT 5900 Series Temperature Controllers It contains an overview of the commands shown in Table 4 1 as well as detailed command descriptions listed in alphabetical order ux Lightwave LDT 5980 5948 61 4A COMMAND REFERENCE GPIB Commands GPIB Commands Table 4 1 GPIB Command Summary Reference List NAME Parameters FUNCTION BEEP 1 Used to turn beep function on or off BEEP none Queries the state of the beep function CAL COARSEDAC 2 Enters the Coarse DAC calibration coefficients CAL COARSEDAC none Queries the Coarse DAC calibration coefficients CAL DEFault none Resets all calibration coefficients to default uncalibrated values CAL ITE 2 Enters TE current coefficients CAL ITE none Queries the TE current coefficients CAL RAC 2 Enters TE AC resistance calibration coefficients CAL RAC none Queries the TE AC resistance calibration coefficients CAL SAVE none Saves all calibration
87. lid Syntax Command 48 LDT 5900 Status Registers Status Register 0 51 LDT 5900 Status Registers Status Register 1 52 LDT 5900 Event Register Contents Event Register 0 54 LDT 5900 Event Register Contents Event Register 1 55 LDT 5900 Output Off Register Contents Output Off Enable Register C eS ee 56 LDT 5900 Output Off Register Contents Output Off Enable Register Lhe WEN SULA EVER Pewee eee tee se 57 LDT 5980 5948 vii TT i Table 4 1 GPIB Command Summary Reference List 62 Table 5 1 Problem and 128 Table 5 2 LDT 5980 5948 Error 129 viii LDT 5980 5948 Lightwave CHAPTER INTRODUCTION AND SPECIFICATIONS B a El El Li Ei a El El El El 3 Li 1 a a This manual contains operation and maintenance information for the LDT 5900 Series Temperature Controllers If you want to get started right away read Chapter 2 which covers Operations first Our goal is to make the best laser diode instrumentation available anywhere To achieve this we need your ideas and comments on ways we can improve our products We invite you to contact us at any time with your suggestions warnine If any of the following symptoms exist or are even suspected remove the LDT 5900 Series Temperature Controller from service Do not use until trained service personnel
88. lower case for some device dependent commands in the command reference are useful for clarity but must be in the correct sequence A single white space must separate a command from its parameters or data White space is normally the space character space bar Other control characters are also interpreted as white space Note Do not use white space before the question mark in a query command If you encounter problems with remote communications the terminator string can be the cause The instrument accepts NL or lt END gt or lt NL gt lt END gt as a command line terminator Many computers terminate with CR NL lt END gt Carriage Return New Line EOI The instrument ignores the CR Carriage Return and treats it as white space You can put more than one command on the same line same command string if you separate them with a semicolon GPIB uses a flexible representation for numeric parameters integer floating point or engineering scientific notation There are no default values for omitted parameters Some device dependent GPIB commands are compound commands in which the first mnemonic opens a path to a set of commands relating to that path The second mnemonic then defines the actual command Table 3 2 shows examples of invalid syntax command strings that produce errors Table 3 2 Invalid Syntax Command Strings COMMAND COMMENT MODE Missing MODE expected MOD
89. many consecutive white spaces can overflow the 80 byte data I O buffer 44 LDT 5980 5948 Lightwave 09 05 REMOTE OPERATIONS Remote Communication Terminators A program message terminator identifies the end of a command string These are the valid terminator sequences NL END lt NL gt lt END gt Many computers terminate with lt CR gt lt NL gt lt END gt Carriage Return New Line EOl A carriage return CR is read as a white space The LDT 5900 terminates its responses with NL END Command Separators You can put more than one command on the same line same command string if you separate them with a semicolon Note The semicolon can be preceded by one or more spaces Examples MEAS T output Note White space after a trailing semicolon will result in an error if no command follows it MODE T set T 35 450 const therm 1 125 2 347 0 855 output ON Parameters Some commands require a parameter The parameter must be separated from the command by at least one space The syntax symbol lt nrf value refers to the flexible numeric representation defined by the GPIB standard It means that you can represent numbers in integer or floating point form or in engineering scientific notation The IEEE 488 2 standard uses the names NR1 NR2 and NR3 respectively to denote integer floating point and scientific notation For example the number twenty may b
90. mmand and query to access these registers The bits of these two registers correspond to the bits of the Status Registers and are defined in Table 3 7 and Table 3 8 No error is reported if the controller output is turned off due to one of these conditions occurring However if the user attempts to turn output on while an Output Off Enable condition presently exists i e temperature over limit then an error will be reported and the request to turn output on will be aborted The default factory settings for the Output Off Enable Registers are also shown in Table 3 7 and 3 8 These registers are not affected by the PSC Power On Status Clear command 09 05 LDT 5980 5948 55 56 REMOTE OPERATIONS Status Reporting Table 3 7 LDT 5900 Output Off Register Contents Output Off Enable Register 0 Value 1 Output Off is enabled Value 0 Output Off is disabled Bit Number Condition Default Value Decimal Value 0 Upper Temperature Limit 0 1 1 Lower Temperature Limit 0 2 2 Sensor Open 0 4 3 Sensor Shorted 0 8 4 TEC Current Upper Limit 0 16 5 TEC Current Lower Limit 0 32 6 TEC Voltage Upper Limit 0 64 7 TEC Voltage Lower Limit 0 128 8 TEC Open 1 256 9 TEC Shorted 1 512 10 Auto Tune in Progress 0 1024 11 Sensor Upper Limit 0 2048 12 Sensor Lower Limit 0 4096 13 3V PCB Supply Out of Tolerance 0 8192 14 5V PCB Supply Out of Tolerance 0 16384 15 15V
91. mmands The following commands can be reached directly from the MEAS command path Measurements are updated approximately every 500 msec MEASure 3Volts MEASure PTE MEASure 5Volts MEASure RAC MEASure 15Volts MEASure SENsor MEASure IADC MEASure INTTemp MEASure ITE MEASure Temp MEASure NEG15Volts MEASure VTE 09 05 LDT 5980 5948 97 COMMAND REFERENCE Command Reference MEASure 3Volts DEVICE DEPENDENT Action The MEASure 3Volts query returns the measured value of the internal 3 3V PCB power supply Response The response is a single value that represents the measured voltage of the power supply Notes The acceptable voltage ranges from 2 97 to 3 63V Example MEAS 3V response 3 21 means the 3V supply is providing 3 21V MEASure 5Volts DEVICE DEPENDENT Action The MEASure 5Volts query returns the measured value of the internal 5V PCB power supply Response The response is a single value that represents the measured voltage of the power supply Notes The acceptable voltage ranges from 4 5 to 5 5V Example MEAS 5V response 4 94 means the 5V supply is providing 4 94V MEASure 15Volts DEVICE DEPENDENT Action The MEASure 15Volts query returns the measured value of the internal 15 0V PCB power supply Response The response is a single value that represents the measured voltage of the power supply Notes The acceptable voltage ranges from 13 5 to 16 5V Example MEAS 15V response 14 91 mean
92. mple SET SENsor 0 002932 action sets the setpoint for the ICV sensor to 2 93mV SET SENsor DEVICE DEPENDENT FRONT PANEL Action The SET SENsor query returns the constant sensor setpoint Response The response is a single value that represents the constant sensor set point value Notes The constant sensor set point is only in effect when the operating mode is constant sensor The units of setpoint are dependent upon what sensor is selected i e if ICI is selected the setpoint will be in Amps Examples SET SEN response 19600 means the constant sensor set point is 19 6 kQ if the sensor selected is a thermistor 09 05 LDT 5980 5948 107 COMMAND REFERENCE Command Reference SET Temp DEVICE DEPENDENT FRONT PANEL Action The SET Temp command sets the constant temperature control setpoint Parameter A lt nrf value gt that represents the constant temperature setpoint in degrees Celsius is required Notes This setting is always stored but is only used when the instrument is in constant temperature mode Example SET T 75 43 action sets the temperature setpoint to 75 43 C SET Temp DEVICE DEPENDENT FRONT PANEL Action The SET Temp query returns the constant temperature setpoint Response The response is a single value that represents the constant temperature setpoint value in OG Notes The constant temperature setting is only in effect when the operating mode is T Examples SET T response 17 3 means th
93. nel display Table 5 2 LDT 5980 5948 Error Codes Range Area of Operation E 100 to E 199 Command Parser Errors E 200 to E 299 Execution Control Errors E 300 to E 399 Remote Operation Errors E 400 to E 499 TEC Control Errors E 700 to E 799 System Errors E 800 to E 899 Internal Errors Error Code Explanation 0 No errors found 123 Command not found 124 Look up failed because query command match failed 125 Parser syntax error 09 05 LDT 5980 5948 129 130 CALIBRATION _ Troubleshooting AND TROUBLESHOOTING Error Code Explanation 126 End of data error 127 Invalid parameter for command 130 Query not supported 131 Command not supported 201 Parameter value out of range 202 Error in conversion of parameter type 203 Command is a secure command but secure commands are disabled 214 Response is too long to output 226 Error in arbitrary block specification 228 Delimiter not found 230 Invalid internal response 301 No data found error 302 Not empty error 401 Controller output off error 402 Calibration failed 403 DSP reset failed 404 Calibration constant error 405 Invalid sensor error 407 Invalid mode error 408 DSP controller communication failure 410 Upper Temperature Limit caused c
94. ng Ohm s Law the voltage drop corresponding to the UUT measured resistances V sens2x V m E R sens2x Calculate the 100 mA Sensor Voltage Measurement slope and offset using the equations below forx a amp b m V ons2b Vide vsens2 2b 2a ens2b TW sens Enable Cal Mode by entering the remote command MODE CAL Enter the new calibration values by using the command CAL SENsor VOLTage 100UA mysens2 Save the new values to flash memory by using the CAL SAVE command Return to Sensor Mode by using the MODE SENSOR command Verify the correct storage of the calibration values by entering CAL SENsor VOLTage 100UA Begin calibration of 1 mA thermistor current by selecting 1 mA thermistor current from Sensor Parameter Menu Connect 10 Q resistor Rsens3a to sensor leads Connect the DMM across the resistor as well to measure voltage Record voltage Vsens3a across Rsens3a as Measured by DMM Record UUT measured resistance R34 using the MEASure SENsor command Replace 10 resistor with 1kQ resistor Rsens3p and record voltage Vsens3b across resistor as measured by DMM Record UUT measured resistance Rap using the MEASure SENsor command Calculate using Ohm s Law the voltage drop corresponding to the UUT measured resistances forx a amp b V ens3x a 2 R 3x sens3x LDT 5980 5948 125 CALIBRATION AND TROUBLESHOOTING Calibration Procedu
95. nt 3 The derivative term D term is calculated from the period of the oscillations that occurred during the tuning of the P term The control loop is allowed to settle after the P and D terms are calculated and set If the defined tuning set point is above the ambient temperature the decrease in the P term will cause a decrease in the control temperature Point 4 LDT 5980 5948 23 OPERATIONS Front Panel Operation After the temperature has stabilized the integral term I term is then added to the control loop Point 5 on Graph The I term is then increased until it causes the temperature to oscillate around the user defined tuning set point Point 7 on Graph The final I term coefficient is set to 33 of the I term value that is found to start oscillations in the temperature control loop This tuning method calculates PID coefficients that result in fast settling times and good set point stability The auto tune algorithm slowly moves towards the oscillation points of the thermal system to consistently find suitable PID coefficients on a wide range of thermal systems and to ensure that the thermal system will not be damaged The calculated PID coefficients are dependent upon the user defined current limit and setpoint temperature If a new setpoint temperature is desired that would require the controller to cool vs heat the Auto Tune feature can be used to calculate optimal PIDs for the new temperature setpoint The tuning tim
96. o the cable ID pins must be configured as follows or the output current from the LDT 5900 will be limited to 1A MAX Output Current Cable ID1 Cable ID2 Pin 17 to 4 Pin 18 to 5 10A Shorted Shorted 5A Shorted Open TEC Grounding Considerations The cable ID ground pins 4 and 5 are isolated from chassis ground pin 6 The chassis is provided for shielding purposes only A CAUTION Do NOT connect the TEC Module pins 9 10 12 13 21 22 24 and 25 to any grounded pins 4 5 and 6 or damage could occur to the module 09 05 LDT 5980 5948 13 gt OPERATIONS Front Panel Operation Front Panel Operation Figure 2 5 shows the front panel of the LDT 5900 Series Temperature Controller The key operating parameters for the LDT 5900 Series Temperature Controller can be set adjusted and displayed through various menus accessible by using the front panel push buttons keys and knobs i Display Section j i Vacuum Fluorescent Display play Adjust Section Adjust Knob HO LX Lig LDT 59XX TEMPERATURE mum t LOCK DISPLAY MENU TEMP VOLTAGE CURRENT SENSOR TEC LIMIT LIMIT LIMIT ERROR ERROR ENTER LOCK POWER SYSTEM PARAMETER MODE PID AUTO TUNE REMOTE SENSOR LIMITS SAVEIREGALL SELECT SELECT OUTPUT MAIN LOCAL Power Switch Mode Section System Section Parameter Section Figure 2 5 Front Panel Display Section Three important areas of the front panel display section are the display screen the
97. ode In all other modes the output will not be disabled when this voltage is reached but the Voltage Limit LED indicator will illuminate The output can be turned off for all operational modes when this limit is reached by enabling bit 6 of Register 0 through the ENABle OUTOFF command Example LIM VTE HI 6 0 action Sets the upper voltage to 6 0V LIMit VTE HIgh Action Response Notes Example DEVICE DEPENDENT FRONT PANEL The LIMit VTE Hlgh query returns the value of the upper TE voltage limit setting The response is a single value that represents the upper voltage limit This limit is only in effect in VTE mode or when bit 6 Register 0 of the ENABle OUTOFF is set true LIM VTE HI response 5 5 means an upper voltage limit of 5 5V LIMit VTE LOw Action Parameters Notes Example DEVICE DEPENDENT FRONT PANEL The LIMit VTE LOw command sets lower TE voltage limit value An nrf value that represents the lower voltage limit in Volts is required Acceptable values are 12 0V to 12 0V The output will only be disabled when the voltage exceeds this limit when the instrument is in VTE mode In all other modes the output will not be disabled when this voltage is reached but the Voltage Limit LED indicator will illuminate The output can be turned off when this limit is reached by enabling bit 7 of Register 0 through the ENABle OUToff command LIM VTE LO 4 0 action Sets the lower voltage to 4 0V Lightw
98. odel and cable type Example LIM ITE LO 4 0 action the lower current limit is set to 4 0 A LIMit ITE LOw Co DEVICE DEPENDENT FRONT PANEL Action The LIMit ITE LOw query returns the value of the lower TE current limit value Response The response is a single value that represents the lower current limit Notes The current limit is in effect in all control modes Example LIM ITE LO response 0 9 means the lower current limit is 0 9 A LIMit SENsor DEVICE DEPENDENT FRONT PANEL The LIMit SENsor command path is used to access the sensor limit commands The following commands may be reached directly from the LIMit SENsor command path LIMit SENsor Hlgh LIMit SENsor HIgh LIMit SENsor LOw LIMit SENsor LOw 09 05 LDT 5980 5948 91 92 LDT 5980 5948 COMMAND REFERENCE Command Reference LIMit SENsor HIgh DEVICE DEPENDENT FRONT PANEL Action The LIMit SENsor Hlgh command sets sensor upper limit value Parameters lt nrf value gt that represents the upper sensor limit Units depend on which sensor is selected For thermistor and RTD units are Ohms for ICI Amps and for ICV Volts Notes Acceptable values for thermistors are 1 to 600000 Acceptable values for RTD are 0 1 to 60000 0 Acceptable values for ICI are 0 000010 to 0 000600 Amps Acceptable values for ICV are 0 100 to 6 000 Volts The minimum upper limit value allowed will be determined by the value set with the LIMit SENsor
99. of Tolerance 0 16384 15 15V PCB Supply Out of Tolerance 0 32768 LDT 5980 5948 81 COMMAND REFERENCE Command Reference ENAB1le OUTOFF C DEVICE DEPENDENT Action The ENABle OUTOFF command sets the controller Output Off Enable Registers The bits in these registers specify the conditions that will cause the controller to automatically turn off Parameters Two lt nrf values gt that represent the sum of the enabled bits for each register The first represents the sum of the enabled bits for register 1 and the second represents the sum of the enabled bits for register 0 e g ENAB OUTOFF lt Reg 1 gt lt Reg 0 gt 1 Enabled 0 Disabled Output Off Enable Register 1 Bit Number Condition Default Value Decimal Value 0 Reserved 0 1 1 Reserved 0 2 2 Reserved 0 4 3 Reserved 0 8 4 Measurement Out of Setpoint Tolerance 0 16 5 Reserved 0 32 6 Reserved 0 64 7 Reserved 0 128 8 Reserved 0 256 9 Internal PCB Temperature Out of Tolerence 1 512 10 Reserved 0 1024 11 Reserved 0 2048 12 TEC Current Runaway 0 4096 13 Reserved 0 8192 14 Reserved 0 16384 15 Reserved 0 32768 This bit cannot be cleared 82 LDT 5980 5948 Lightwave COMMAND REFERENCE Command Reference Notes Read these registers using the ENABle OUTOFF query The factory default values for these registers are 512 and 6159 for registers 1 and 0 respec
100. oller output to turn off 430 Cable change caused controller output to turn off 431 Neg 15V supply out of tolerance condition caused controller output to turn off 432 Setpoint over upper limit caused controller output to turn off 433 Setpoint under lower limit caused controller to turn off 714 Display error 715 Logic error 821 Command handler couldn t send message 832 UART received bad length byte 850 Internal mail list access list failed 851 Unknown TEC ID command 854 Invalid UART ID 855 UART transmit buffer overflow 856 UART receive buffer overflow 09 05 LDT 5980 5948 131 CALIBRATION AND TROUBLESHOOTING Troubleshooting 132 1 5980 5948 IN ILX Lightwave
101. on about the operation complete flag 09 05 LDT 5980 5948 49 9o REMOTE OPERATIONS zd Remote Communication Sequential Overlapped Commands All common commands for the LDT 5900 Series Temperature Controllers are sequential and most device dependent commands are executed after the previous command is complete The WAI common command is an example of a sequential command which forces the next command to wait until the no operation pending flag is true This is essentially the same as waiting for the OPC flag to become true because the no operations pending flag is used to set the OPC flag bit O of the Standard Event Status Register Query Response Timing Query responses are evaluated at the time the query request is parsed and not at the time the response message is sent In most cases this does not create a problem since the time between parsing a query and sending its response is small However due to latency of new measurements being available we recommend waiting at least one second after changing any sensor parameter or output condition before querying temperature measurements sensor measurements or status Likewise wait one second to turn the output on after changing any sensor parameter 50 LDT 5980 5948 uix Lightwave REMOTE OPERATIONS Status Reporting CHAPTER J Status Reporting The following sections discuss the LDT 5900 status reporting including the STATUS EVENT ENAB
102. ontroller output to turn off 411 Lower Temperature Limit caused controller output to turn off 412 Open sensor caused controller output to turn off 413 Shorted sensor caused controller outputcontroller output to turn off 414 Upper Current Limit caused controller output to turn off 415 Lower Current Limit caused controller output to turn off 416 Upper Voltage limit caused controller output to turn off 417 Lower Voltage Limit caused controller output to turn off 418 Open TEC Module caused controller output to turn off 419 Shorted TEC Module caused controller output to turn off 420 Sensor over resistance caused controller output to turn off 421 Sensor under resistance caused controller output to turn off 422 Plus 3V supply out of tolerance condition caused controller output to turn off 423 Plus 5V supply out of tolerance condition caused controller output to turn off 424 Plus 15V supply out of tolerance condition caused controller output to turn off LDT 5980 5948 Lightwave CALIBRATION AND TROUBLESHOOTING Troubleshooting Error Code Explanation 425 Measurement out of setpoint tolerance caused controller output to turn off 426 PCB Temperature out of tolerance caused controller output to turn off 427 Invalid calibration data caused controller output to turn off 428 DSP reset caused controller output to turn off 429 Current limit and thermal runaway caused contr
103. or VOLTage 100UA DEVICE DEPENDENT Action The CAL SENsor VOLTage 100UA command is used to enter the calibration coefficients for the sensor voltage measurement with a 100 uA sensor supply current Parameters Two values are required to set the sensor voltage calibration The first represents the slope and the second reprsents the offset in voltage measurement Notes This is a service command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section of Chapter 5 for complete calibration instructions Example CAL SEN VOLT 100UA 1 0 action Enters a slope of 1 0 V V and an offset of 0 V for the sensor voltage measurement calibration CAL SENsor VOLTage 100UA DEVICE DEPENDENT Action The CAL SENsor VOLTage 100UA query returns the calibration coefficients for the sensor voltage measurement with a 100 uA sensor supply current Response The response is two values the first represents the calibration voltage measurement slope and the second represents the voltage offset coefficients Notes See the Calibration section of Chapter 5 for complete calibration instructions Example CAL SEN VOLT 100UA Response 1 0 means a slope of 1 0 V V and an offset of 0 V for the sensor voltage measurement calibration CAL SENsor VOLTage 1MA DEVICE DEPENDENT Action The CAL SENsor VOLTage 1MA command is used to enter the calibration coefficients for the sensor voltage measurement
104. or for RS 232 communications This connection can be cabled to a computer s serial communication port ILX recommends a maximum cable length of 3 meters 9 8 feet For more information regarding RS 232 communications see Chapter 3 09 05 LDT 5980 5948 11 gt OPERATIONS e General Operation General Operation The following sections present some guidelines for operation as well as some common operating procedures Remote operations are discussed in Chapter 3 and the command reference is discussed in Chapter 4 Warm Up and Environmental Considerations Operate the LDT 5900 Series Temperature Controller at an ambient temperature range of 10 C to 40 C Storage temperatures should be in the range of 40 C to 70 C To achieve the rated stability let the LDT 5900 warm up for at least five minutes Rear Panel Connections 14 Ooeooee 906800000 1 RT _SENSE 6 CHASSIS 11 N C 16 N C 21 TEC 2 RT _SENSE 7 TEC _SNS 12 TEC 17 CABLE ID1 22 TEC 3 N C 8 TEC _SNS 13 TEC 18 CABLE ID2 23 N C 4 ID1 9 TEC 14 RT 19 N C 24 TEC 5 ID2 10 TEC 15 RT 20 N C 25 TEC Figure 2 4 Rear Panel TEC Connector 12 LDT 5980 5948 IN ILX Lightwave OPERATIONS General Operation When the LDT 5900 is controlling a thermoelectric TE module in cooling mode current flows from TEC pins 9 10 21 and 22 connected internally to TEC pins 12 13 24 and 25 connected internally This is referred to as pos
105. or the current IC sensor coefficients CONST ICV Com Action Parameters Notes Example DEVICE DEPENDENT FRONT PANEL The CONST ICV command sets the slope and offset coefficients for a voltage IC sensor Two lt nrf values gt are required The first represents the slope in mV and the second represents the offset in mV Acceptable values for slope are 0 to 99 99 mV Acceptable values for offset range between 9 99 and 99 99 mV CONST ICV 4 2 3 0 action enters a slope of 4 2 mV and an offset of 3 0 mV for the ICV coefficients LDT 5980 5948 75 76 LDT 5980 5948 COMMAND REFERENCE Command Reference CONST ICV CUR DEVICE DEPENDENT FRONT PANEL Action The CONST ICV query returns the slope and offset coefficients for a voltage IC sensor Response The response is two values The first represents the slope The second represents the offset Notes Example CONST ICV response 4 2 3 0 means a slope of 4 2 mV and an offset of 3 0 mV for the voltage IC sensor coefficients CONST RTD COMMC DEVICE DEPENDENT FRONT PANEL Action The CONST RTD command sets the A B C and Ro coefficients for an RTD sensor Parameters Four lt nrf values gt are required The first represents the A coefficients the second is the B coefficient the third is the C coefficient and the fourth is the Ro in Ohms The scale factors for A B and C are programmed into the instrument and are as follows A 1
106. ors can be purchased through ILX Lightwave See Chapter 2 for more details on sensor constants Example CONST THERMistor 1 25 2 36 0 76 action Sets the Steinhart Hart coefficients to C1 1 25 C2 2 36 and 0 76 CONST THERMistor DEVICE DEPENDENT FRONT PANEL Action The CONST THERMistor query returns the values of the Steinhart Hart coefficients Response The response is three values that represent the values of C1 C2 and C3 in that order Notes These values are prescaled so that the exponential value is not given The actual value of C1 is scaled by 10E 03 C2 by 10E 04 and C3 by 10E 07 Example CONST THERMistor Response 1 25 2 36 0 76 C1 1 25 C2 2 36 and 0 76 DELAY DEVICE DEPENDENT Action The DELAY command is used to initiate a delay between commands Parameters One lt nrf gt value is required The value is the delay in milliseconds The value range is from 0 to 60 000 Example DELAY 250 action Initiates a delay of 250ms prior to the next command DISPlay Col DEVICE DEPENDENT FRONT PANEL Action The DISPlay command is used to turn the display on or off Parameters One lt nrf gt value is required 0 Display off 1 Display on Example DISP 1 action Turns the display on 09 05 LDT 5980 5948 77 COMMAND REFERENCE Command Reference DISPlay Action The DISPlay query returns the status of the display DEVICE DEPENDENT FRONT PANEL Response The return
107. ow is set too tight the output may never reach tolerance Example LIM TOL 0 01 action Sets the tolerance limit to 0 01 C if instrument is set to T mode The output trigger will go high when the temperature is within 0 01 C of the setpoint LIMit TOLerance Co DEVICE DEPENDENT FRONT PANEL Action The LIMit TOLerance query returns the value of the controlled setpoint tolerance limit Response The response is a single value that represents the tolerance Notes The units of the tolerance window match those of the mode and in some cases the sensor type of the instrument Example LIMit TOL response 0 005 means a tolerance window of 0 005kQ if the instrument is 09 05 set to Sensor mode with a thermistor as the sensor LDT 5980 5948 95 96 LDT 5980 5948 COMMAND REFERENCE Command Reference LIMit VTE DEVICE DEPENDENT FRONT PANEL The LIMit VTE command path is used to access the VTE limit commands The following commands can be reached directly from the LIMit VTE command path LIMit VTE Hlgh LIMit VTE HIgh LIMit VTE LOw LIMit VTE LOw LIMit VTE HIgh DEVICE DEPENDENT FRONT PANEL Action The LIMit VTE HIgh command sets upper TE voltage limit value Parameters An nrf value that represents the upper voltage limit in Volts is required Notes Acceptable values are 12 0V to 12 0V The output will only be disabled when the voltage exceeds this limit when the instrument is in VTE m
108. ower on Status Clear has been enabled See PSC command Bit 0 of the Service Request Enable Register SRE must be set to enable GPIB Service Request generation for the conditions specified by the Event Enable Registers See the Event Register section of Chapter 3 for additional details ENAB OUTOFF 0 7 action sets the controller Output Off Enable Registers so that only a Sensor Open 4 or an Upper or Lower Temperature Limit 1 and 2 condition will cause a GPIB Service Request Event Enable Register 0 Bit Number Condition Default Value Decimal Value 0 Upper Temperature Limit 0 1 1 Lower Tempature Limit 0 2 2 Sensor Open 0 4 3 Sensor Shorted 0 8 4 TEC Current Upper Limit 0 16 5 TEC Current Lower Limit 0 32 6 TEC Voltage Upper Limit 0 64 7 TEC Voltage Lower Limit 0 128 8 TEC Open 0 256 9 TEC Shorted 0 512 10 Auto Tune in Progress 0 1024 11 Sensor Upper Limit 0 2048 12 Sensor Lower Limit 0 4096 13 3V PCB Supply Out of Tolerance 0 8192 14 5V PCB Supply Out of Tolerance 0 16384 15 15V PCB Supply Out of Tolerance 0 32768 09 05 LDT 5980 5948 79 COMMAND REFERENCE Command Reference ENAB1le EVENT Action Response DEVICE DEPENDENT The ENABle EVENT query returns the contents of the controller Event Enable Registers The response is two values which represent the sum of the enabled bits for register 1 and the sum of the enabled bits for reg
109. ower temperature limit setting LIMit TOLerance none Enters the setpoint tolerance LIMit TOLerance none Queries the setpoint tolerance LIMit VTE HIgh 1 Enters the upper TE voltage limit setting LIMit VTE HIgh none Queries the upper TE voltage limit setting LIMit VTE LOw 1 Enters the lower TE voltage limit setting LIMit VTE LOw none Queries the lower TE voltage limit setting INEfreq 1 Enters the line frequency filter 50 or 60 Hz INEfreq none Queries the line frequency filter setting EASure 3Volts none Queries the measured 3V PCB supply voltage EASure 5Volts none Queries the measured 5V PCB supply voltage EASure 15Volts none Queries the measured 15V PCB supply voltage EASure IADC none Queries the internal TE current sensor EASure INTTemp none Queries the measured internal temperature EASure ITE none Queries the measured TE current EASure NEG15Volts none Queries the measured 15V PCB supply voltage EASure PTE none Queries the measured TE power EASure RAC none Queries the measured TE AC resistance EASure SENsor none Queries the measured sensor uA or mV EASure Temp none Queries the measured sensor temperature EASure VTE none Queries the measured TE voltage ESsage 1 Enters an ASCII string into non volatile memory ESsage none Queries the ASCII message string ODE 1 Selects the instrument s control mode ODE none Queries the instrument s control mode OPC none Sents the Operation Complete status when all overlapped commands are completed
110. per Temperature Limit 1 1 1 Lower Temperature Limit 1 2 2 Sensor Open 1 4 3 Sensor Shorted 1 8 4 TEC Current Upper Limit 0 16 5 TEC Current Lower Limit 0 32 6 TEC Voltage Upper Limit 0 64 7 TEC Voltage Lower Limit 0 128 8 TEC Open 0 256 9 TEC Shorted 0 512 10 Auto Tune in Progress 0 1024 1 Sensor Upper Limit 1 2048 12 Sensor Lower Limit 1 4096 13 3V PCB Supply Out of Tolerance 0 8192 14 5V PCB Supply Out of Tolerance 0 16384 15 15V PCB Supply Out of Tolerance 0 32768 54 LDT 5980 5948 uix Lightwave REMOTE OPERATIONS Status Reporting Table 3 6 LDT 5900 Event Register Contents Event Register 1 Bit Number Condition Default Value Decimal Value 0 RAC Measurement Complete 0 1 1 Reserved 0 2 2 Output On 0 4 3 Measurement Within Setpoint Tolerance 0 8 4 Measurement Out of Setpoint Tolerance 0 16 5 Reserved 0 32 6 Reserved 0 64 7 Reserved 0 128 8 Reserved 0 256 9 Internal PCB Temperature Out of Tolerance 9 512 10 Invalid Calibration Data 0 1024 11 DSP Reset 0 2048 12 TEC Temperature Runaway 0 4096 13 Reserved 0 8192 14 15V PCB Supply Out of Tolerance 0 16384 15 Reserved 0 32768 Output Off Registers The Output Off Enable Registers allow the user to specify the conditions which will cause the temperature controller output to automatically turn off A host controller program must issue the ENABLE OUTOFF co
111. perature is more precisely controlled Notice also that the lower slope of the curve at the higher temperatures results in a smaller feedback signal It may be necessary if you are controlling to higher temperatures to use a thermistor with a different curve Figure 2 7 Example Thermistor Resistance vs Temperature Vth 10 pA Vth 100 pA Resistance 0 5 V 5V 50 0 4 V 4V 40 KQ 0 3 V 3V 30 kQ po p uis 0 1 V 1V 10 ka T T T T 20 C 40 60 C 80 C 100 C 09 05 LDT 5980 5948 35 OPERATIONS Basic TEC Operation Instructions IC I Sensors When an IC I sensor is selected the LDT 5900 measures temperature based on the current delivered by the sensor An example of an IC I sensor is the Analog Devices AD590 This device delivers 1uA K or approximately 298 uA at 25 C The terminal of the transducer should be connected to the RT pin and the terminal should be connected to RT The RT _SENSE and RT _SENSE pins should NOT be connected when using this device The nominal slope for the AD590 is 1uA K and the offset is nominally OA but both can be adjusted to calibrate your particular sensor by entering the PARAMETER SENSOR menu The sensor will have approximately 9V across it at 25 C but will vary over the temperature range In IC I sensor mode the LDT 5900 has a sensor current limit of 600 uA approximately 325 C IC V Sensors When an IC V sensor is selected the LDT 5900 measures
112. presents slope and the second represents offset Notes See the Calibration section of Chapter 5 for complete calibration instructions Example CAL ITE response 4 2 0 5 CAL RAC DEVICE DEPENDENT Action The CAL RAC command is used to enter the calibration coefficients for the TE AC resistance measurement Notes This is a service related command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section of Chapter 5 for complete calibration instructions Example CAL RAC 10 0 action a slope of 10 and offset of 0 is entered for TE AC resistance measurement calibration coefficients CAL RAC DEVICE DEPENDENT Action The CAL RAC query returns the TE AC resistance measurement calibration coefficients Response The response will be two values the first represents slope and the second represents offset Notes See the Calibration section of Chapter 5 for compete calibration instructions Example CAL RAC response 4 2 0 5 LDT 5980 5948 69 70 LDT 5980 5948 COMMAND REFERENCE Command Reference CAL SAVE COMMO DEVICE DEPENDENT Action The CAL SAVE is used to save all calibration coefficients in non volatile memory Parameters None Notes This is a service related command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section fof Chapter 5 for complete calibration instruc
113. r on but outputs have been shut off This may occur if the instrument loses power AC line briefly or line voltage drops below specification If instrument is locked up power it off and then on to restart Output has been shutoff Check for output off enable conditions Chapter 3 make sure the cable is securely connected to the unit and the load TE Controller Power on but no TE current output Check the load connections and operating mode Make sure the cable between the instrument and the load is secure Power on but temperature is not controlled or is unstable If there is a SENSOR OPEN indication E412 check the sensor connections pins 14 15 Check that the proper sensor current range is selected The 10 uA setting is required if the thermistor resistance is more than 50 See Application note 42 at www ilxlightwave com or contact ILX Customer Service The 1 mA setting is required for resistances less than 1 kQ Check that the appropriate coefficients have been set for your sensor Refer to Sensor Options in Chapter 2 Check that the P and D constants are optimized for your thermal load and that the current limit value is not too low Refer to PID Auto Tune in Chapter 2 See Technical Solutions on the Support page at www ilxlightwave com Unable to adjust output or parameter Ensure that the desired parameter is highlighted Ensure that you are not trying to set
114. re 6af Calculate the 1 mA Sensor Voltage Measurement slope and offset using the equations below m aa Veda vsens3 V 3b D sand T My sens3 Vi 6ag Enable Cal Mode by entering the remote command MODE CAL 6ah Enter the new calibration values by using the command CAL SENsor VOLTage 1MA mysens5 Dysens3 6ai Save the new values to flash memory by using the CAL SAVE command 6aj Return to Sensor Mode by using the MODE SENSOR command 6ak Verify the correct storage of the calibration values by entering CAL SENsor VOLTage 100UA 7 RAC Calibration NOTE Rac mode and the subsequent recalibration thereof is only possible with firmware version 01 03 09 and above 7b Select Rac mode and connect TE output across TE Cal resistor Rte To ensure highest possible accuracy ensure TE voltage sense lines are connected to the same points on the TE Cal resistor as the TE output Enable Rac measurement by sending the remote command OUTput ON 7d Record the first measurement for Rac by querying the instrument with MEASure RAC Rac measurement with another OUTput ON command followed by a MEASure RAC query and record this second Rac measurement 7f Repeat this process several additional times to generate a well defined mean value for Raci 7g Replace Ryg with Rac Cal resistor Rrac 7h several measurements of Rrac using OUTput ON and MEASure RAC to generate a
115. rent Lower Limit 0 32 6 TEC Voltage Upper Limit 0 64 7 TEC Voltage Lower Limit 0 128 8 TEC Open 0 256 9 TEC Shorted 0 512 10 Reserved 0 1024 1 Sensor Upper Limit 1 2048 12 Sensor Lower Limit 1 4096 13 Reserved 0 8192 14 Reserved 0 16384 15 Reserved 0 32768 ENABle OUTOFF DEFault DEVICE DEPENDENT Action The ENABle OUTOFF DEFault command sets the controller Output Off Enable Registers to their factory default values of 512 for register 1 and 6159 for register 0 Parameters None Example ENAB OUTOFF DEF See the ENABle OUTOFF command for more details ERRors C DEVICE DEPENDENT FRONT PANEL Action The ERRors query returns the contents of the error log and then clears the error log Response The returned value is a list of the error codes See Table 3 4 for a list of the error codes and their definitions Example ERR response 410 means the upper temperature limit caused the output to turn off 09_05 LDT 5980 5948 85 COMMAND REFERENCE Command Reference ESE lt nrf value gt Common VICE DEPENDENT Event Status Enable Action Enables bits in the Standard Event Status Enable Register Parameter The value must be between 0 and 255 Output Module 8 Bias 9 2 4 3 diode Diode L Earth Ground 339CONFa Notes Bit 5 of the Status Byte Register STB is set if any enabled conditions are true Example ESE 128 Enables power on status to be reported in
116. rent instrument configuration into non volatile memory When a configuration is stored all of the parameter values PIDs sensors limits trigger settings and setpoint values are saved There are nine 9 bins for user storage Bin 0 is reserved for the factory default parameters See Default Settings in Chapter 2 Bins 1 9 can be used to save any desired configuration for later use This allows fast and easy setup for tests or other high repeatability needs The system GPIB address and RS 232 baud rate are not saved in the user bins To save a configuration repeatedly press the SELECT key until the SAVE RECALL LED is illuminated Use the adjust knob to select an appropriate storage bin and then press the ENTER LOCK key Once a configuration has been properly saved the following will be displayed MN NLX Lightwave LDT 59xx TEMPERATURE CONTROLLER Save 1 Success 4 Ri 1 1 0 LOCK eca DISPLAY MENU TEMP VOLTAGE CURRENT SENSOR TEC 4 LIMIT LIMIT LIMIT ERROR ERROR ENTER LOCK SYSTEM PARAMETER PID AUTO TUNE MODE POWER REMOTE SENSOR LIMITS SAVE RECALL MAIN LOCAL SELECT OUTPUT 28 LDT 5980 5948 Lightwave OPERATIONS Front Panel Operation RECALL The Recall function is used to return the LDT 5900 to a previously defined state or configuration To recall a saved configuration or unconfigured bin of the LDT 5900 select the Recall parameter from th
117. represents the 1 mA current source calibration coefficient Notes See the Calibration section of Chapter 5 for complete calibration instructions Example CAL SOURCE SENsor 1MA Response 1 056 means a scale factor of 1 056 has been applied for the current source calibration CAL VTE COMMC DEVICE DEPENDENT Action The CAL VTE is used to enter the calibration coefficients for the TE voltage measurement Parameters Two lt nrf values gt are required to set the VTE calibration The first represents the slope and the second represents the offset in voltage Notes This is a service related command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section of Chapter 5 for complete calibration instructions Example CAL VTE 1 0 action enters a slope of 1 0 V V and an offset of 0 V for the TE voltage measurement calibration CAL VTE COMMC DEVICE DEPENDENT Action The CAL VTE query returns the calibration coefficients for the TE voltage measurement Response The response is two values The first represents the voltage slope The second represents the voltage offset coefficients Notes See the Calibration section of Chapter 5 for complete calibration instructions Example CAL VTE response 0 954 0 0123 means a slope of 0 954 V V with an offset of 0 0123 V for the TE voltage measurement CLS Common Action Clears the Standard Event Status Register ESR the Event Regis
118. rf values are required The first represents P the proportional term the second represents the integral term and the third represents D the derivative term Notes Valid values for P are between 0 and 9999 99 Valid values for are between 0 and 999 999 Valid values for D are between 0 and 999 999 PID constants are only applicable in temperature and sensor modes See Chapter 2 for more details on setting PID constants Example PID 24 5 6 8 0 action sets P 24 00 1 5 600 and D 8 000 LDT 5980 5948 Lightwave COMMAND REFERENCE Command Reference PID Action Response Notes Example DEVICE DEPENDENT The PID Query returns the values of the PID coefficients The response is three integer values the first being the P term the second being the term and the third being the D term The optimal PID coefficients depend on the sensor used the thermal system and the control mode For optimizing PID coefficients see Chap 2 PID response 24 00 5 600 8 000 means P 24 00 I 5 600 and D 8 000 PSC COMMON Power on Status Clear Action Parameters Notes Examples Sets automatic power on clearing of the enable registers One nrf value representing the power on status clear flag is required 0 disable power on clearing 1 enable power on clearing Any non zero value is interpreted as 1 Facotry default is 1 enabled Registers affected Service Request Enable SRE Standard Event Sta
119. rmistors Calibrating a thermistor consists of measuring its resistance at various temperatures and fitting these measured data to the Steinhart Hart equation The resulting coefficients C1 C2 and C3 effectively describe the thermistor More information about the Steinhart Hart equation is contained in ILX Application Note 4 Contact ILX Customer Service see page xii for contact information or go to the ILX website www ilxlightwave com To measure the precise temperature of a load you must use a calibrated sensor For example when using a thermistor enter its Steinhart Hart coefficients C1 C2 and C3 in the TEC page 3 menu see Basic TEC Operation Instructions If the exact temperature is not crucial within 1 5 C and you are using a 10 kQ thermistor use the default constants provided by the LDT 5900 However the LDT 5900 temperature accuracy specifications apply only to a calibrated thermistor For more information about calibrating your thermistor go to www ilxlightwave com support index html and click Technical Solutions Thermistor resistance changes with temperature The LDT 5900 supplies constant current either 10 uA or 100 uA through the thermistor so that a temperature change results in a voltage change across the thermistor This voltage change is sensed by the instrument and fed back to the control loop The 34 LDT 5980 5948 Lightwave OPERATIONS Basic TEC Operation Instructions supply current s
120. rror happened 09 05 LDT 5980 5948 87 88 COMMAND REFERENCE Command Reference EVENT Action Response DEVICE DEPENDENT The EVENT query returns the contents of the controller Event Registers and then clears the registers These registers log the controller events that occurred since power on or since the last EVENT query The response is two values which represent the sum of the event bits for register 1 and the sum of the enabled bits for register 0 respectively Event Enable Register 1 LDT 5980 5948 Bit Number Condition Decimal Value 0 RAC Measurement Complete 1 1 Reserved 2 2 Output On 4 3 Measurement Within Setpoint Tolerance 8 4 Measurement Out of Setpoint Tolerance 16 5 Reserved 32 6 Reserved 64 7 Reserved 128 8 Reserved 256 9 Internal PCB Temperature Over Limit 512 10 Invalid Calibration Data 1024 11 DSP Reset 2048 12 TEC Temperature Runaway 4096 13 Reserved 8192 14 15V PCB Supply Out of Tolerance 16384 15 Reserved 32768 Notes These registers can be used in conjunction with the ENABle EVENT command Examples EVENT response 0 8 means that only the Sensor Short event has occurred See the Event Registers section of Chapter 3 for additional details Lightwave COMMAND REFERENCE Command Reference Event Enable Register 0 Bit N
121. s the 15V supply is providing 14 91V MEASure IADC DEVICE DEPENDENT Action The MEASure IADC query returns the measured value of the TEC current as measured across an internal current sense register Response The response is a single value that represents the measured TEC current in Amps Notes The response is the measured output current regardless of control mode Example MEAS IADC response 3 75 means the measured output current is 3 75 A 98 LDT 5980 5948 Lightwave COMMAND REFERENCE Command Reference MEASure INTTemp DEVICE DEPENDENT Action The MEASure INTTemp query returns the value of the measured internal temperature within the instrument Response The response is a single value that represents the measured temperature within the instrument in degrees Celsius Notes The temperature sensor for this reading is located on the main PCB within the instrument The acceptable internal temperature is 5 to 60 C Example MEAS INTTemp response 36 7 means the internal temperature is at 36 7 9C MEASure ITE DEVICE DEPENDENT Action The MEASure ITE query returns the value of the TE current Response The response is a single value that represents the TE current in Amps Notes The response is the output current regardless of control mode Example MEAS ITE response 4 2 means the controller output current is set to 4 2A MEASure NEG15Volts COMN DEVICE DEPENDENT Action The MEASure NEG
122. s which can add up to 2 C Accuracy figures are quoted for a typical 10 kQ thermistor and 100 uA current setting for 5 C to 50 C Both resolution and accuracy are dependent upon the user defined configuration of the instrument 4 Into a 0 1 to 2 5 Q load Temperature stability measurements made at 25 C with a 10 kohm thermistor on the 100 pA setting The number is derived from the avg P P value over the measurement period Measured over the full DC current range into a 1Q load P Proportional I Integral D Derivative Software programmable terms through the front panel or GPIB Thermistor sensing current range software selectable through the front panel or GPIB Resistance range 0 3Q to 10Q with 4 wire voltage sense for rated accuracy Higher resolution can be obtained through GPIB less than 0 1 Q with 10 thermistor current and 0 01 Q with 100 pA thermistor current a 09 05 LDT 5980 5948 7 INTRODUCTION AND SPECIFICATIONS Specifications 8 LDT 5980 5948 uix Lightwave CHAPTER 2 OPERATIONS This chapter describes the operation of the LDT 5900 Series Temperature Controller It is divided into five sections covering front panel overview rear panel overview general operations front panel operations and basic TEC operations Front Panel Overview The LDT 5900 Series Temperature Controller s front panel contains a Vacuum Fluorescent Display VFD display power switch LED indicators bu
123. se 0 8 means that there currently is a Sensor Short condition See the Status Registers section of Chapter 3 for additional details Lightwave 09 05 Status Register 0 COMMAND REFERENCE Command Reference Bit Number Condition Decimal Value 0 Upper Temperature Limit 1 1 Lower Temperature Limit 2 2 Sensor Open 4 3 Sensor Shorted 8 4 TEC Current Upper Limit 16 5 TEC Current Lower Limit 32 6 TEC Voltage Upper Limit 64 7 TEC Voltage Lower Limit 128 8 TEC Open 256 9 TEC Shorted 512 10 Auto Tune in Progress 1024 11 Sensor Upper Limit 2048 12 Sensor Lower Limit 4096 13 3V PCB Supply Out of Tolerance 8192 14 5V PCB Supply Out of Tolerance 16384 15 15V PCB Supply Out of Tolerance 32768 LDT 5980 5948 111 COMMAND REFERENCE Command Reference STB Status Byte Action Response COMMON VICE DEPENDEN Requests the value in the Status Byte Register The value must be between 0 and 255 Notes Example AA Numeric Value ENABle EVENT Summary 1 Message Available MAV 16 ESE Event Summary ESB 32 Request Service MSS RQS 64 ERR Error Log Available 128 L Unused bits Refer to the GPIB IEEE488 2 1992 standard for more information on Service Requests STB Response 1 means an ENABle EVENT condition has occured TIME Action Response Notes Example COMMON COMMON DEVICE DEPENDENT The
124. sensor currently selected has an asterisk next to it ii NLX Lightwave LDT 59xx TEMPERATURE CONTROLLER Therm IC V 4 LOCK T C I R ay D DISPLAY MENU TEMP VOLTAGE CURRENT SENSOR TEC Y LIMIT LIMIT LIMIT ERROR ERROR ENTER LOCK SYSTEM PARAMETER MODE PID AUTO TUNE POWER REMOTE SENSOR LIMITS SERGE SELECT SELECT MAIN LOCAL To select a sensor type press the down arrow key until the proper sensor is highlighted and then press the ENTER LOCK key A menu displaying the coefficients and current setting required for that particular sensor is then accessed For a thermistor the Steinhart Hart coefficients C1 C2 C3 and sensor current can be modified as shown below LDT 5980 5948 Lightwave OPERATIONS Front Panel Operation HOt NLX Lightwave LDT 59xx TEMPERATURE CONTROLLER Cl 001 125 4 LOCK C2 002 347 DISPLAY MENU TEMP VOLTAGE CURRENT SENSOR TEC 4 LIMIT LIMIT LIMIT ERROR ERROR ENTERILOCK SYSTEM PARAMETER PID AUTO TUNE MODE POWER REMOTE SENSOR LIMITS SAVE RECALL MAIN LOCAL SELECT SELECT The coefficients can be modified by using the Adjust Knob and then pressing the ENTER LOCK key For more details on sensor see Sensor Options later in this chapter LIMITS The Limits menu allows the user to select and modify the setpoint and error limits The arrow keys and adjust knob can be used to cycle through and select or modify t
125. sponding loads at the same 118 LDT 5980 5948 Lightwave 09_05 CALIBRATION AND TROUBLESHOOTING Calibration location as the remaining output wires Failure to do this will result in voltage differentials that will degrade the calibration accuracy Finally pins 4 and 17 and 5 and 18 must be shorted together to allow operation at maximum current A computer capable of GPIB or RS232 communications is required in order to calibrate the instrument CALIBRATION VIA THE FRONT PANEL IS NOT POSSIBLE It shall be assumed that the computer and instrument are already connected and communicating correctly LDT 5980 5948 119 CALIBRATION AND TROUBLESHOOTING Calibration Procedure Calibration Procedure 1 WARMUP 1a Using the multimeter s 4 wire Kelvin resistance measurement mode accurately measure the resistance of the TE cal and sensor measurement cal resistors Allow the measurement to sit undisturbed for at least 1 minute before recording any readings to allow any heating or excess noise due to handling to dissipate ib Connect one end of the calibration test cable to the output of the instrument to be calibrated and the other end to the appropriate cal resistors 1c Gointo the Parameter Limits menu and set each limit to its maximum value id Place unit in ITE Mode set output to 5 A and enable fe A Allow unit to warm up a minimum of 5 minutes with the output on before proceeding with calibration 1f Note Calculated
126. ters EVENT the Error Queue ERR and all the corresponding bits in the Status Byte Register STB Notes Useful to clear registers before enabling service requests SRQ Example CLS Lightwave 09 05 COMMAND REFERENCE Command Reference CONST DEVICE DEPENDENT FRONT PANEL The CONST command path is used to access the calibration constant commands and queries The following commands may be reached directly from the CONST command path CONST ICI CONST ICI CONST ICV CONST ICV CONST RTD CONST RTD CONST ICI Action Parameters Notes Example DEVICE DEPENDENT FRONT PANEL The CONST ICI command sets the slope and offset coefficients for a current IC sensor Two nrf values are required The first represents the slope in and the second represents the offset in WA Acceptable values for slope are 0 to 99 99 uA K Acceptable values for offset range between 9 99 and 99 99 HA Current IC coefficients are typically supplied by the manufacturer CONST ICI 2 5 0 action enters a slope of 2 5 and an offset of 0 uA for the ICI coefficients CONST ICI Action Response Notes Example DEVICE DEPENDENT FRONT PANEL The CONST ICI query returns the slope and offset coefficients for a current IC sensor The response is two values The first represents the slope The second represents the offset CONST ICI response 2 5 0 means a slope of 2 5 A and an offset of 0 f
127. the LDT 59XX Controller 2 Connect your thermal load with TEC and sensor to output cable verifying all wiring 3 Press the SELECT key in the Parameter section until SENSOR menu indicator is illuminated 3a Using the up down arrow keys select the appropriate sensor and press the ENTER LOCK key 3b Using the adjust knob enter the correct coefficientsand current setting for your sensor and press the ENTER LOCK key The user must press ENTER LOCK within ten seconds of selecting the value 4 Press the SELECT key in the Parameter section until LIMITS menu indicator is illuminated 4a Using the up down arrow keys the adjust knob and ENTER LOCK key enter Temperature Sensor Irg and Vrg limits appropriate for your sensor and application 5 Verify that no errors are present If in constant temperature or sensor mode verify that an appropriate temperature or sensor reading is being measured 6 Press the SELECT key in the Parameter section until PID AUTO TUNE indicator is illuminated Enable the auto tune function to determine nominal P and D coefficients for your thermal load 7 Press the SELECT key in the Mode section to select constant T Rsnsr Ire or Vre mode Using the adjust knob enter the correct setpoint for your application and press ENTER LOCK The user must press ENTER LOCK within ten seconds of selecting the value 8 Enable OUTPUT on Actual measured value should move to setpoint value 09
128. the control mode setpoint commands and queries The following may be reached directly from the SET command path SET ITE SET ITE SET SENsor SET SENsor SET TEMP SET TEMP SET VTE SET VTE 106 LDT 5980 5948 Lightwave COMMAND REFERENCE Command Reference SET ITE DEVICE DEPENDENT FRONT PANEL Action The SET ITE command sets the constant TE current control setpoint Parameter A lt nrf value gt that represents the ITE current setpoint in Amps is required Notes This setting is always stored but is only used when the instrument is in ITE control mode Example SET ITE 2 5 action sets the setpoint for ITE mode to 2 5A SET ITE DEVICE DEPENDENT FRONT PANEL Action The SET ITE query returns the constant TE current setpoint Response The response is a single value that represents the constant ITE set point value in Amps Notes The ITE set point is only in effect when the operating mode is ITE Examples SET ITE response 0 5 means the output current set point is 0 5 A SET SENsor Co DEVICE DEPENDENT FRONT PANEL Action The SET SENsor command sets the constant sensor setpoint Parameter A lt nrf value gt that represents the constant sensor setpoint is required Notes This setting is always stored but is only used when the instrument is in sensor mode The units of the parameter are in dependent upon which sensor is selected RTD and thermistor in Ohms ICI in Amps ICV in Volts Exa
129. the original sensor output current at the 100 uA setting by a factor of 1 234 CAL SOURCE SENsor 100UA DEVICE DEPENDENT Action The CAL SOURCE SENsor 100UA query returns the calibration coefficient for the 100 HA sensor current source Response The response is one value that represents 100 pA current source calibration coefficient Notes See the Calibration section of Chapter 5 for complete calibration instructions Example CAL SOURCE SEN 100UA Response 1 204 means a scale factor of 1 204 has been applied for the 100 uA current source calibration CAL SOURCE SENsor 1MA DEVICE DEPENDENT Action The CAL SOURCE SENsor 1MA is used to enter the calibration coefficient for the 1 mA sensor current source Parameters One nrf value is required representing the 1mA scale factor Notes This is a service related command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section of Chapter 5 for complete calibration instructions Example CAL SOURCE SEN 1MA 1 056 Action Scales the original sensor output current at the 1mA setting by a factor of 1 056 09 05 LDT 5980 5948 73 74 LDT 5980 5948 COMMAND REFERENCE Command Reference CAL SOURCE SENsor 1MA DEVICE DEPENDENT Action The CAL SOURCE SENsor 1MA query returns the calibration coefficient for the 1 mA sensor current source Response The response is one value that
130. time The integral gain coefficient determines how fast the system will settle to its final setpoint Large values will settle faster with more overshoot Possible oscillation could occur if too large Small values will take longer to settle but with much less overshoot D The derivative gain coefficient helps to control the output response dynamics Large values can help the system to settle more quickly but a D value that is too large can cause the system to be unstable or oscillate Small values allow the temperature to move as quickly as possible When optimizing the system performance it is recommended that only one coefficient be modified at a time To modify the PID coefficients select the PID AUTO TUNE menu Using the up and down arrows select the appropriate parameter The one selected will be enclosed in brackets Use the Adjust Knob to adjust the desired value and then press the ENTER LOCK key to save it LDT 5980 5948 25 OPERATIONS Front Panel Operation HOT Lightwave LDT 59xx TEMPERATURE CONTROLLER P 0030 00 t LOCK 1 0 0 0 0 8 0 0 DISPLAY MENU TEMP VOLTAGE CURRENT SENSOR TEC 4 LIMIT LIMIT LIMIT ERROR ERROR ENTER LOCK SYSTEM PARAMETER MODE EE PID AUTO TUNE POWER REMOTE SENSOR LIMITS BAVEREGALI SELECT OUTPUT MAIN LOCAL SENSOR The Sensor parameter allows the user to select the type of sensor for the application Thermistor IC V IC I RTD The
131. tion Example MES test complete action stores the string test complete into non volatile memory MESsage DEVICE DEPENDENT Action The MESsage command queries the status of the message Response The response value is a 15 character long string Example MES response test complete means a previously stored message was test complete MODE Col DEVICE DEPENDENT FRONT PANEL Action Selects the feedback control mode for the instrument Parameters One lt character data value gt representing the control mode is required The values accepted are T SENSOR VTE ITE and CAL Notes Changing modes forces the output off Examples MODE SENSOR action changes the control mode to sensor which is equivalent to Rsnsr the front panel MODE DEVICE DEPENDENT FRONT PANEL Action The MODE query returns the selected control mode Response The response is a character response representing the control mode The possible responses are T SENSOR and ITE VTE or RAC without quotes Notes SENSOR mode is equivalent to Rau mode from the front panel Examples MODE response T means that the controller is in constant temperature control mode OPC COMMON Operation Complete Action Sets the operation complete bit in the Event Status Register when all pending overlapped commands have been completed Response None Example OPC LDT 5980 5948 101 102 COMMAND REFERENCE Command Refer
132. tions Example CAL SAVE action Saves all calibration coefficients CAL SENsor VOLTage 10UA Action Parameters Notes Example DEVICE DEPENDENT The CAL SENsor VOLTage 10UA command is used to enter the calibration coefficients for the sensor voltage measurement with a 10 uA sensor supply current Two values are required to set the sensor voltage calibration The first represents the slope and the second represents the offset in voltage measurement This is a service command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section of Chapter 5 for complete calibration instructions CAL SEN VOLT 10UA 1 0 action Enters a slope of 1 0 V V and an offset of 0 V for the sensor voltage measurement calibration CAL SENsor VOLTage 10UA Action Response Notes Example DEVICE DEPENDENT The CAL SENsor VOLTage 10UA query returns the calibration coefficients for the sensor voltage measurement with a 10 uA sensor supply current The response is two values the first represents the calibration voltage measurement slope and the second represents the voltage offset coefficients See the Calibration section of Chapter 5 for complete calibration instructions CAL SEN VOLT 10UA Response 1 0 means a slope of 1 0 V V and an offset of 0 V for the sensor voltage measurement calibration Lightwave COMMAND REFERENCE Command Reference CAL SENs
133. tively The conditions that will cause the output to shut off are Upper or Lower Temperature Limit Sensor Open or Shorted Upper or Lower Sensor Limit and Internal PCB Temperature Out of Tolerance If you set bit 4 in register 1 the output will shut off whenever the controlled temperature is out of tolerance specified using the LIM TOL command If the temperature is not within the limits you will not be able to turn on the output You should wait until the temperature is within your tolerance specification before setting this bit To clear these registers send ENAB OUTOFF 0 0 To reset these registers to their default values send ENAB OUTOFF DEF Examples ENAB OUTOFF 0 7 action sets the TEC Output Off enable registers so that only a Sensor Open 4 or an Upper or Lower Temperature Limit 1 and 2 condition will cause the output to be automatically turned off Output Off Enable Register 0 Bit Number Condition Default Value Decimal Value 0 Upper Temperature Limit 1 1 1 Lower Temperature Limit 1 2 2 Sensor Open 1 4 3 Sensor Shorted 1 8 4 TEC Current Upper Limit 0 16 5 TEC Current Lower Limit 0 32 6 TEC Voltage Upper Limit 0 64 7 TEC Voltage Lower Limit 0 128 8 TEC Open 0 256 9 TEC Shorted 0 512 10 Reserved 0 1024 1 Sensor Upper Limit 1 2048 12 Sensor Lower Limit 1 4096 13 Reserved 0 8192 14 Reserved 0 16384 15 Reserved 0 32768 09 05 LDT 5980 5948 83
134. ttons and adjust knob Each of the labeled areas on the front panel is described in the Front Panel Operations section Vacuum Fluorescent Display Adjust Knob LX Lightwave 107 5948 PRECISION TEMPERATURE SYSTEM PARAMETER MODE PIDAUTO TUNE et REMOTE Row SENSOR mE MAINLOCAL m SELECT PT SELECT X Power Switch E P m Buttons LED Indicators Figure 2 1 Front Panel Lightwave LDT 5980 5948 9 OPERATIONS Rear Panel Overview 10 Rear Panel Overview Rear Panel Controls and Connections TRIG OUT TRIG IN AX lt gt oe VAN E RS 232 ao 4 MI ILX Lightwave D Gy i i a en vade USA S SERIAL Figure 2 2 Rear Panel AC Power Entry Module The AC Power Entry Module is located on the lower right side of the rear panel The LDT 5900 must be connected to a properly rated AC source in order to operate Trigger Input Connector The TRIGGER IN connector is located to the right of center on the rear panel The leading edge input of this signal is used to initiate a programmable temperature setpoint step The TRIGGER IN is a BNC input connector and can be driven with a TTL signal For more information on trigger functionality see Front Panel Operations in Chapter 2 Trigger Output Connector The TRIGGER OUT connector is located next to the Trigger In connector This output indicates if the measurement for the curr
135. tus Enable ESE Event Enable Registers ENAB EVENT In the disabled state the values of the enable registers are saved through power off on The power on status clear flag see PSC is set false allowing service request interrupts after power on In the enabled state the enable registers are cleared during power on The power on status clear flag see PSC is set true disallowing service request interrupts after power on PSC 0 Disable automatic power on clearing of the enable registers PSC 1 Enable automatic power on clearing of the enable registers PSC COMMON Power on Status Clear Action Response Example 09 05 Requests the state of the power on status clear flag The response is a single value that represents the state of the power on status clear flag 0 The enable registers are saved through power off on 1 The enable registers are cleared during power on PSC response 1 means automatic power on clearing of the enable registers is enabled LDT 5980 5948 103 COMMAND REFERENCE Command Reference PUD Program User Data Action Notes COMMON FRONT PAN Stores data unique to the instrument such as calibration date and serial number This data is protected from change by the SECURE lt nrf gt command and is usually entered by the factory The arbitrary block program data is exactly 25 bytes long PUD Action Response RADix Action Parameters Notes
136. uired representing the 10 scale factor This is a service related command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section of Chapter 5 for complete calibration instructions CAL SOURCE SEN 10UA 0 9217 Action Scales the original sensor output current at the 10 setting by a factor of 0 9217 CAL SOURCE SENsor 10UA Action Response Notes Example DEVICE DEPENDENT The CAL SOURCE SENsor 10UA query returns the calibration coefficient for the 10 uA sensor current source The response is one value that represents 10 pA current source calibration coefficient See the Calibration section of Chapter 5 for complete calibration instructions CAL SOURCE SEN 10UA Response 0 93 means a scalefactor of 0 93 has been applied for the 10 uA current source calibration Lightwave COMMAND REFERENCE Command Reference CAL SOURCE SENsor 100UA DEVICE DEPENDENT Action The CAL SOURCE SENsor 100UA is used to enter the calibration coefficient for the 100 sensor current source Parameters lt nrf value is required representing the 100 pA scale factor Notes This is a service related command Calibration mode should not be entered unless the user has the proper measurement equipment in place See the Calibration section of Chapter 5 for complete calibration instructions Example CAL SOURCE SEN 100UA 1 234 Action Scales
137. umber Condition Decimal Value 0 Upper Temperature Limit 1 1 Lower Tempature Limit 2 2 Sensor Open 4 3 Sensor Shorted 8 4 TEC Current Upper Limit 16 5 TEC Current Lower Limit 32 6 TEC Voltage Upper Limit 64 7 TEC Voltage Lower Limit 128 8 TEC Open 256 9 TEC Shorted 512 10 Auto Tune in Progress 1024 11 Sensor Upper Limit 2048 12 Sensor Lower Limit 4096 13 3V PCB Supply Out of Tolerance 8192 14 5V PCB Supply Out of Tolerance 16384 15 15V PCB Supply Out of Tolerance 32768 IDN COMMON Action Requests the instrument to identify itself Response Returns a comma delimited standard format ASCII identification string from information stored in the instrument during manufacture Example IDN response ILX Lightwave LDT 5948 59481234 05 19 10 means ILX Lightwave is the manufacturer LDT 5948 is the model number 59481234 is the serial number and 05 19 10 is the firmware version 09 05 LDT 5980 5948 89 COMMAND REFERENCE Command Reference KEY COMMON DEVICE DEPENDENT Action The KEY command is used to initiate a front panel key press or knob turn Parameters One lt nrf gt value is required Each key knob is assigned a specific number Key 0 gt Output Enable Disable Key 1 gt Enter Lock Key 2 gt Up arrow Key 3 gt Down arrow Key 4 gt Main Local Key 5 gt Parameter Select Key 6 gt Mode Select Key 7 gt Reserved Key 8 gt Reserved Key 9 gt Reserved Key 10 gt Dial in
138. uminated green LED next to each of the listed menus indicates which is currently active The parameter menus are PID AUTO TUNE Sensor Limits and Save Recall all of which are described as follows Parameter menu entry will automatically timeout after 10 seconds of no activity and the instrument will return to its default measurement display mode 09 05 LDT 5980 5948 21 OPERATIONS Front Panel Operation PID AUTO TUNE Selecting this parameter allows access to the Auto Tune feature and to view or modify the PID constants The Auto Tune feature and user modification of the PID constants are only available in constant temperature T and constant sensor Rsnsr control modes See the Mode Section later in this chapter for details on selecting the control mode The PID constants are not used in any of the other control modes Background Tuning the temperature controller means setting the proportional integral and derivative terms for the best control for a particular system or process The I and D terms are defined as follows P The proportional constant which controls the loop gain The integral constant which offsets errors and affects settling time D The derivative constant which affects the damping rate The range of acceptable PID values are shown in the table below Table 2 1 PID Constant Values Parameter Range Default Proportional 0 9999 99 20 0 Integral 0 999 9
139. urrent and module manufacturers typically specify a maximum safe operating current for their module The LDT 5900 provides a current limit feature that allows you to set the maximum current LDT 5980 5948 37 r OPERATIONS e Basic TEC Operation Instructions that the controller supplies See Limits under the Parameter section in Chapter 2 to set the appropriate limits for your TE It is normal for the controller to operate at the current limit especially when the load temperature is far from the setpoint The current limit LED will illuminate green when the controller is in a current limit condition If the heatsink is too small for the application the heatsink eventually becomes heat saturated condition where heat is being transferred to the heatsink faster than the heatsink can dissipate the heat When the heatsink becomes saturated the TEC current increases in an attempt to cool the load this additional current creates more heat than can be dissipated and subsequently more TEC current is applied This situation is sometimes referred to as thermal runaway and can cause a load and TEC to become damaged The current limit LED will illuminate RED in a thermal runaway condition i e the current is running at its limit and the temperature is moving away from the setpoint To help avoid thermal runaway damage the LDT 5900 Series Temperature Controller provides a high temperature limit setting When the load temperature exceeds th
140. ut will allow an external TTL signal to trigger the instrument to the next temperature setpoint Example TRIG IN ENAB 1 action Enables the input trigger TRIGger IN ENABle Co DEVICE DEPENDENT FRONT PANEL Action The TRIGger IN ENABle query returns the value of the trigger input enable status Response The response is a single value that represents the input trigger enable status The number 1 means the input trigger is enabled and the number 0 means the input trigger is disabled Notes Example TRIG IN ENAB response 0 means the input trigger is disabled TRIGger IN START Co DEVICE DEPENDENT FRONT PANEL Action The TRIGger IN START command sets the starting temperature setpoint Parameters lt nrf value that represents the desired starting temperature setting is required in C Notes Valid input range is limited to the LIM TEMP HI and LIM TEMP LO settings Example TRIG IN START 20 action Sets the starting temperature setpoint to 20 C 09 05 LDT 5980 5948 113 COMMAND REFERENCE Command Reference TRIGger IN START DEVICE DEPENDENT FRONT PANEL Action The TRIGger IN START query returns the value of the starting temperature setpoint Response The response is a single value that represents the starting temperature setpoint in C Notes Example TRIG IN START response 20 means the starting temperature setpoint is 20 C TRIGger IN STEP Co DEVICE DEPENDENT FRONT PANEL Action The TRiG
141. values for slope and scale factor should be close to 1 00 Offset values should be close to 0 00 1g Record the current calibration values by querying each calibration command This should be done in case of an error so the previous calibration state can be recovered A list of all calibration commands can be found in Figure 3 1 and Table 4 1 2 VTE MEASUREMENT CALIBRATION 2a Enable Cal Mode by entering the remote command MODE CAL 2b Reset the calibration constants to default values of 1 0 for slope and 0 0 for offset by entering the command CAL DEFault CAL SAVE Note This command sets ALL calibration values to default 2c Enable ITE Mode by entering the remote command MODE ITE 2d Setoutput to 5 A 4 5 A if 5948 to prevent current limit from enabling and connect the DMM Digital MultiMeter across the TE Cal resistor to measure voltage Pay attention to polarity 2e Allow one minute for current to stabilize if output has just been enabled 2f Record the TE voltage as measured by the instrument Unit Under Test UUT A more accurate method to determine is by averaging several readings obtained by querying the instrument via the MEASure VTE Command Note Note Allow a minimum of 2 seconds to elapse between readings to ensure the instrument has had enough time to perform another round of measurements 2g Record the actual TE voltage as measured by the DMM VTEpmym1 Again it is more accurate to determine
142. with the grounding wire connected to an electrical ground safety ground ILX Lightwave recommends connecting the instrument only to properly earth grounded receptacles The power cord connector and power cable meet IEC safety standards AC Line Power Requirements This instrument operates from a single phase power source delivering line voltages of 100 240 VAC all values RMS from 50 60 Hz Tilt Foot Adjustment The LDT 5900 Series comes standard with folding front legs and two rear feet for use as a benchtop instrument Extend the front legs to tilt the front panel upward making it easier to read the display Rack Mounting The LDT 5900 Series Temperature Controllers conform to international standards for a 2U height 1 2 width rack mounting Rack mount accessory kits contain detailed mounting instructions 09 05 LDT 5980 5948 3 INTRODUCTION AND SPECIFICATIONS Available Options and Accessories Available Options and Accessories Description Model Number Single Rack Mount Kit enables installation into a standard 19 inch rack RM 139 Dual Rack Mount Kit enables installation of two LDT 5900 instruments into a RM 140 standard 19 inch rack Temperature Controlled Laser Diode Mount 498X High Power Laser Diode Mount 4442 5900 TE Controller Unterminated 10A Interconnect Cable 6 feet CC591H 5900 TE Controller Laser Diode Mount 5A Interconnect Cable 6 feet CC595H Calibrated 10 Kohm
143. y time TRIGGER OUT 6 7 Delay 001 000 sec MENU The Trigger Out feature allows the user to determine if the instrument is controlling a TEC within a specific tolerance window This window is defined by the setpoint a user specified tolerance See the Limits portion of the Parameter Section later in this chapter for details on how to set this tolerance value If the measurement for the selected control mode e g Temperature is within this tolerance window the Trigger Out TTL level will be high if out of tolerance the level will be low The Trigger Out signal is output from the TRIG OUT BNC connector See the Rear Panel Overview section earlier in this chapter for connector location The delay time determines how long the measurement must remain within the tolerance window before Trigger Out is asserted high If the measurement goes out of tolerance during this delay period the delay time interval is restarted when the measurement goes back into tolerance 20 LDT 5980 5948 Lightwave OPERATIONS Front Panel Operation A D Setup The last page of the system menu allows the user to set up the A D filter to reject either 50 Hz or 60 Hz AC line noise The default frequency for this filter is 60 Hz A D SETUP 7 737 Line Freq 60 Hz Parameter Section The Parameter section contains the SELECT key and the parameter indicators Pressing the SELECT key cycles through each of the available menus An ill

ILX Lightwave -- LDT-5980

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