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LDC-3916558 Device-Dependent Commands

1. Notes The selected channel s Steinhart Hart constants C1 C2 and C3 are used to convert resistance to temperature Examples TEC CONV R 12 456 12 456 kO is converted to temperature and saved in memory TEC CONV R REMOTE The TEC CONV R query converts thermistor resistance kO to temperature 9C and returns the value of the most recent conversion Parameters Either no parameter or an nrf value that corresponds to a resistance in Notes The calibration constants C1 C2 and C3 are used to convert resistance to temperature Examples TEC CONV R returns a value that corresponds to the temperature of the most recent conversion TEC CONV R 12 789 converts 12 789 kO to temperature and returns a number that corresponds to temperature in TEC CONV T REMOTE The TEC CONV T command converts temperature 9C to thermistor resistance Parameters nrf value that corresponds to a temperature in Notes The selected channel s Steinhart Hart constants C1 C2 and C3 are used to convert temperature 9C to resistance Examples TEC CONV T 25 6 25 6 is converted to resistance and saved in memory 08 05 LDC 3916558 8 43 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC CONV T FRONT PANEL REMOTE The TEC CONV T query converts temperature 9C to thermistor resistance kO and returns the value of the most recent con
2. Changing control modes whil the output is on will turn the output off LDC 3916558 77 TROUBLESHOOTING Troubleshooting Guide 78 LDC 3916558 Lightwave
3. E 802 Calibration error Measurement entered before calibration was ready E 803 Calibration error Invalid sensor specified for calibration 08 05 LDC 3916558 27 REMOTE OPERATIONS 0 cmarten aor Messages 28 7 LDC 3916558 Lightwave CHAPTER COMMAND REFERENCE El a E a El w H Li E B E a Ei a a This chapter is a guide to all of the device dependent commands for the LDC 3916558 3 Amp Temperature Control Module This chapter is divided into two parts The first part contains an overview of the remote commands used by the LDC 3916558 The second part contains all of the LDC 3916558 commands in alphabetical order Table 4 1 lists the commands for the LDC 3916558 modules Lightwave LDC 3916558 29 COMMAND REFERENCE GPIB Commands GPIB Commands Table 4 1 LDC 3916 Device Dependent Commands Name Parameters Function STATMENU LINEn NONE Returns the name of the measurement that is displayed on line n of the status menu n can be either 1 or 2 STATMENU LINEn TEMP NONE Sets line n of the status menu to display TEC temperature STATMENU LINEn ITE NONE Sets line n of the status menu to display TEC current STATMENU LINEn RES NONE Sets line n of the status menu to display thermistor resistance STATMENU LINEn TEV NONE Sets line n of the stus menu to dis
4. Notes Response is the selected module s measured TEC output current regardless of control mode This measurement is updated approximately once every 600 msec Examples TEC ITE response 0 7 means the selected module s measure TEC output current it 0 7 A 52 LDC 3916558 Lightwave 08_05 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC LASOFF FRONT PANEL REMOTE The TEC LASOFF command configures the TEC to turn off an external laser current source white nrf nrf CO Oe HEHE Ponte Parameters Examples Two lt nrf values gt are required The first represents channel number of the laser module and the seond represents the laser source output The range of the channel number is 0 through 17 where O NONE and 17 all channel The range for the laser source output number is 0 to 3 where O NONE and 3 BOTH TEC LASOFF 1 3 action sets the TEC to turn off both laser outputs of channel 1 TEC LASOFF 1 2 action sets the TEC to turn off the number two output of channel 1 TEC LASOFF 17 3 action sets the TEC to turn off all outputs of all the channels TEC LASOFF 0 0 action sets the not to turn off any laser output in any channel TEC LASOFF Parameters Examples FRONT PANEL REMOTE The TEC LASOFF query returns the channel number and output of the laser the TEC module is configure to turn off 20 Ge None The response data represents
5. spePPPP di 7 6 5 4 3 2 1 0 bit wise 1 LOGICALAND eid c d lei 71615 4 1312110 TEC Event Status Enable Register TEC ENABIe EVEnt lt nrf gt TEC ENABIe EVEnt To ALLEVE LOGICAL OR Register TEC EventBit Reference 0 Current Limit Occurred 8 Sensor Changed 1 Voltage Limit Occurred 9 Entered or Exited In Tolerance State 2 n a 10 Output Turned Off 3 Temperature Limit Occurred 11 n a 4 n a 12 n a 5 n a 13 n a 6 Sensor Circuit Opened 14 n a 7 Output Circuit Opened 15 n a Figure 3 3 LDC 3916558 Event Status Registers The bits in a module s Event Registers are sticky when an event occurs the corresponding bit will remain set until the user reads the Event Register 24 m LDC 3916558 Lightwave REMOTE OPERATIONS Output Off Registers Output Off Registers The Output Off Enable Registers allow you to specify the conditions that cause the temperature controllers outputs to be automatically turned off The events and conditions that may be selected to turn off the outputs are shown in Table 3 2 Table 3 2 LDC 3916558 TEC Output Off Register Contents Bit Number Condition Default Value 0 Current Limit 0 Disabled 1 Voltage Limit 0 2 N A 0 3 Temperature Limit 1 Enabled 4 N A 0 5 N A 0 6 Sensor Open 1 7 Module Open 1 8 Sensor Changed 0 9 Not in Toleran
6. 10 Example Thermistor Resistance vs Temperature 14 LDC 3916558 3 Amp Temperature Controller Command Path Structure20 LDC 3916558 Status Condition Registers 23 LDC 3916558 Event Status Registers 24 Command Description 33 LDC 3916558 iii iv LDC 3916558 Lightwave LIST TABLES BH El El El El El El El El m a El a El a Table 2 1 TEC Controllable Laser Sources 11 Table 2 2 3916558 Default 05 16 Table 2 3 TEC Error 17 Table 3 1 LDC 3916558 Often Used Commands 21 Table 3 2 LDC 3916558 TEC Output Off Register Contents 25 Table 4 1 LDC 3916 Device Dependent Commands 30 Table 5 1 Recommended Test 68 Table 5 2 Required Calibration 68 Lightwave LDC 3916558 v En vi 7 LDC 3916558 Lightwave CHAPTER 1 INTRODUCTION AND SPECIFICATIONS B B a El El Li El mH El El El El 3 LI Ba a a This chapter is an introduction to the LDC 3916558 3 Amp Temperature Control Module for the LDC 3916 or LDC 3908 Laser Diode Controller Mainframe It contains unpacking information instructions on how to install and apply power and safety
7. COMMAND REFERENCE LDC 3916558 Device Dependent Commands CAL DEFAULT FRONT PANEL REMOTE The TEC CAL DEFAULT command sets all of the selected module s TEC calibration constants to default values root Parameters Notes This command should only be used in the case in that the calibration has become corrupted and circumstances make calibration impossible Measurements and setpoints on the selected module s TEC1 are not guaranteed to meet accuracy specifications after this command is issued Accuracy will remain unspecified until calibration is performed on the module WARNING This command will set ALL of the module s TEC calibration constants to their default values Examples TEC CAL Default action the selected module sets all of its TEC calibration constants to their default values TEC CAL ITE FRONT PANEL REMOTE The TEC CAL ITE command is used to initiate the calibration procedure for the selected module s TEC current setpoint current measurement and current limit OK 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 Service Reference portion of this manual for complete calibration instructions After this command is issued the selected module will enter ITE calibration mode Examples TEC CAL ITE action the selected module enters calibrati
8. Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC EVEnt FRONT PAN REMOTE The TEC EVEnt query returns the contents of the selected module s TEC Event Status register POC POL POP Parameters None The response is the sum of the following 1 Current Limit Occurred 256 Sensor was Changed While Output was On 2 Voltage Limit Occurred 512 In Tolerance Condition was Entered or Exited 4 1024 Output Turned Off 8 Temperature Limit Occurred 2048 N A 16 4096 N A 32 N A 8192 N A 64 Sensor Circuit Opened 16384 N A 128 Output Circuit Opened 32768 N A Open Circuit Notes The events in this register will not be reported to the 3916 or the 3908 s Status Byte unless they are selected using the TEC ENABle EVEnt command The event status register is only cleared when it is read or in response to a CLS command Examples TEC EVE response 131 means that an Output Circuit Opened event 128 a Voltage Limit Occurred event 2 and a Current Limit Occurred event 1 have occurred since the last TEC EVEnt query TEC GAIN FRONT PANEL REMOTE The TEC GAIN command sets the selected module s TEC control loop gain white nrf Lj space value Parameters nrf value between 1 and 127 that represents the gain The value will be rounded to the nearest integer Notes An error is generated if the value is invalid or not between 1 and 127 Examples TEC GAIN 40 act
9. Damage to the instrument and devices will occur 6 m LDC 3916558 Lightwave OPERATIONS Operating the Temperature Controllers from the Front Panel Operating the Temperature Controllers from the Front Panel This section describes how to operate the LDC 3916558 3 Amp Temperature Controller from the front panel of either the LDC 3916 or LDC 3908 mainframe It begins by reviewing the front panel operations and continues by showing you an example For a more detailed explanation of the front panel keys see either the LDC 3916 or LDC 3908 Mainframe manual General Front Panel Operation DISPLAY AREA ADJUST AREA SOFTKEYS Figure 2 2 3916 Front Panel The two areas of interest on the front panel are the DISPLAY area and the ADJUST area The DISPLAY area contains the display screen and various keys that allow you to select a menu and parameters within that menu The keys labeled F1 F2 F3 and F4 have several functions depending which page is displayed The boxed text on the right of the screen are the functions associated with these softkeys In the lower right corner of the DISPLAY area are the UP 7 and DOWN 4 ARROW hardkeys Most of the menus have adjustable parameters You adjust the parameters using the or 4 hardkeys 08 05 LDC 3916558 7 OPERATIONS Operating the Temperature Controllers from the Front Panel The ADJUST section contains keys used to adjust the value of a parameter once selected Set
10. ALLCOND and ALLEVE queries to determine if any interesting situations exist and then only poll the module that has indicated the situation When a selected condition exists in a module the mainframe s ALLCOND register has the bit corresponding to that module set When a selected event has occurred in a module the bit corresponding to that module is set in the ALLEVE register Each channel of the LDC 3916 and LDC 3908 may contribute to the ALLCOND and ALLEVE registers For the 3916558 module the enabled conditions of the temperature controller are logically ORed and the summary is passed to the appropriate bit of the ALLCOND register see Figure 3 2 Likewise the enabled events of the temperature controller are logically ORed and the summary is passed to the appropriate bit of the ALLEVE register see Figure 3 3 By appropriate bit we mean the bit corresponding to the channel number bits 0 15 correspond to modules in channels 1 16 or bits 0 7 corresponding to modules in channels 1 8 Furthermore you can set up the mainframe so that when a situation of interest occurs in one or more modules the mainframe generates an SRQ Service Request to the host controller For example you may want the LDC 3916 or the LDC 3908 to interrupt the host controller in the event of TEC s temperature going out of tolerance As Figure 3 3 shows bit 9 of TEC s Event register will be set when the temperature goes into or 22 m LDC 3916558 Li
11. C2 and C3 effectively describe the thermistor If you need to know the precise temperature of your load you must use a calibrated thermistor and enter its Steinhart Hart coefficients C1 C2 and C3 in the page 3 menu If the exact temperature is not crucial you can use the default constants provided by the 3916558 However the 3916558 s temperature accuracy specifications apply only to a calibrated thermistor with C1 C2 and C3 entered In effect constant temperature control mode is the same as constant resistance mode but the temperature setpoint TSet is converted to a resistance setpoint RSet the constant resistance setpoint is not affected by TSet If you prefer to avoid that conversion or if you do not know your thermistor s coefficients but you know the thermistor resistance at your desired operating point then constant resistance mode is an option for you Another control mode that is available in the 3916558 is constant current mode In general the amount of heat a TEC module pumps depends on its drive current If you have a situation where a constant heat load must be removed or added then you might consider using constant current mode 12 LDC 3916558 Lightwave OPERATIONS Guidelines Setting The control circuit in the 3916558 s temperature controller includes proportional section The amount of current provided by this circuit is proportional to the difference between the measured t
12. Figure 2 6 TEC p3 Menu In the TEC page 3 menu press the hardkey until the Gain parameter is highlighted If you re not sure what the best gain setting should be a safe first choice is 30 If you want the controller to drive to the setpoint faster enter a higher value For this example enter the number 35 Now press the J hardkey until the Sensor parameter is highlighted For now press the INC hardkey in the ADJUST area until 100 uA is displayed The other parameters you can enter from this page are the Steinhart Hart coefficients for the particular thermistor that you are using to measure temperature If it s installed in a laser package the coefficients may be available in the package documentation You can restore the default values by pressing the F2 softkey The defaults are approximate values for the typical 10 thermistor Figure 2 7 TEC p4 Menu From the TEC page 3 menu press the F4 softkey it is attached to the down arrow box on the page 3 menu Now you will see the TEC page 4 menu In the TEC page 4 menu you can configure the TEC to turn off a laser current source in a different channel that has any of the modules shown in Table 2 1 The TEC will then turn off an external laser if the temperature limit is exceeded or if the TEC fails in anyway Highlight the Channel parameter and turn the knob or press the INC hardkey to select the desired channel number All to choose all channels or None so that the TEC will no
13. analog ground The pinout diagram for this connector is shown in Figure 2 1 Lightwave LDC 3916558 5 OPERATIONS Connecting to the Temperature Controller 1 2 TE Module e 3 4 TE Module 5 6 Earth Ground 7 Sensor 8 Sensor 9 Analog Ground 10 N C e 11 N C 12 13 e 14 N C 15 N C Figure 2 1 Rear Panel Connector Current will flow from pins 1 and 2 connected internally to pins 3 and 4 when the controller is trying to cool the load This is referred to as positive current Current will flow from pins 3 and 4 to pins 1 and 2 when the controller is trying to heat the load Pin 5 and 6 are connected to the LDC 3916 or LDC 3908 chassis which is connected to earth ground Sensor current 10 uA or 100 uA flows from pin 7 to pin 8 a voltage will develop across a thermistor connected to these pins Analog Ground is provided at pin 9 as a convenient reference when making measurements or troubleshooting a system but it is not normally required Pins 10 15 are reserved by ILX Lightwave for diagnostic purposes and must not be connected TEC Grounding Considerations The TEC Module pins are isolated from chassis ground allowing either output terminal to be connected to earth ground at the user s option A CAUTION For the TEC connector if any one terminal pin is grounded then no other terminal pin should be grounded Do NOT connect Sensor to TEC Module or
14. 3916558 3 Amp Temperature Controller has its own module specific command set separate from the commands for the LDC 3916 LDC 3908 mainframe see either the LDC 3916 or LDC 3908 Instruction Manual Chapter 3 Operating in Remote Control Figure 3 1 shows all of the commands that are usable by the LDC 3916558 module in conjunction with the LDC 3916 and LDC 3908 Lightwave LDC 3916558 19 20 LDC 3916558 ALLCOND ALLEVE BEEP CHAN CHECKSUM DELAY ERR MENU MES MES RAD RAD SECURE TERM TERM TIME TIMER REMOTE OPERATIONS Remote Configuration MODERR MODIDN MODPUD MODPUD STATMENU LINE n STATMENU LINE nTEMP STATMENU LINE rtRES STATMENU LINE niTE STATMENU LINE nTEV n 1 or 2 CONST CONST COND EVE GAIN GAIN ITE ITE LAS OFF LASOFF MODE OUT OUT R SEN SEN SYNCI SYNCR SYNCT SYNCV TOL TOL ENAB COND COND EVE EVE OUTOFF OUTOFF LIM ITE ITE THI THI STAT SET ITE R Figure 3 1 LDC 3916558 3 Amp Temperature Controller Command Path Structure Lightwave REMOTE OPERATIONS 3 LDC 3916558 3 Amp Temperature Controller Often Used Commands CHAPTER LDC 3916558 3 Amp Temperature Controller Often Used Commands The complete command set of the LDC 3916558 3 Amp Temperature Control module is listed in chapter 4 of
15. controller that a device s controlled temperature has settled to its setpoint 08 05 LDC 3916558 21 y REMOTE OPERATIONS Status Reporting Status Reporting Refer to either the LDC 3916 or LDC 3908 Laser Diode Controller Mainframe Instruction Manual Chapter 3 Operating in Remote Control for more detailed information on standard status structures and mainframe related commands The following sections discuss the LDC 3916558 module dependent aspects of status reporting including the OUTOFF commands and queries The Output Off Register is used to specify the conditions that will force a temperature controller to turn off Status Registers The temperature controller in an LDC 3916558 has its own Condition register and Event register These registers indicate the existence or occurrence of conditions or events of interest An example of a condition is Current drive is in current limit An example of an event is Current drive went into current limit A program running on a host controller may poll the device i e TEC on the module loaded into the LDC 3916 or LDC 3908 mainframe to determine if a condition exists or an event happened that may be of interest or that may constitute a problem Alternatively a controller program may set up the modules to report only conditions or events of interest when they occur The controller program can then simply read the mainframe s All Condition or All Event registers using the
16. directly from the TEC SET command path TEC SET ITE TEC SET R TEC SET T TEC SET ITE FRONT PANEL REMOTE The TEC SET ITE query returns the selected module s TEC constant current setpoint ver Coo PHO e Parameters None The response is an nrf value that represents the selected module s constant ITE set point value in Amps Notes The ITE set point is only in effect when the operating mode is ITE Examples TEC SET ITE response 0 5 means the selected module s TEC output current set point is 0 5 A 60 LDC 3916558 Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC SET R FRONT PANEL REMOTE The TEC SET R query returns the selected module s TEC constant thermistor resistance set point Parameters response is an nrf value that represents the selected module s constant resistance set point value in Notes The constant thermistor resistance set point is only in effect when the operating mode is R Examples TEC SET R response 19 6 means the selected module s TEC resistance set point is 19 6 kO TEC SET T FRONT PANEL REMOTE The TEC SET R query returns the selected module s TEC constant temperature setpoint TON Parameters None The response is an nrf value that represents the selected module s constant temperature set point value in Notes The constant temperature setting is o
17. in mind the following principles 1 Toensure measurement accuracy the voltage across the thermistor must not exceed 5 V 2 To improve control responsiveness the thermistor voltage variations that result when the load temperature deviates from the setpoint should be as large as possible Using 10 A as the sense current will allow you to use a maximum thermistor resistance of 500 The 100 pA setting allows an 50 maximum To see why maximizing the voltage variation is an issue refer to Figure 2 8 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 08 05 LDC 3916558 13 OPERATIONS Guidelines Vth 10uA Vth 100 pA Resistance 0 5 V 0 4 V 0 3 V 0 2 V 0 1 V 20 C 40 60 80 100 C Figure 2 8 Example Thermistor Resistance vs Temperature Suppose you want to use the thermistor in Figure 2 8 to control a load to 20 C At 20 C the thermistor s resistance is 25 kQ Deviations of 1 C from 20 C will cause resistance variations of about 2 If you use the 10 pA setting there will be 20 mV of feedback to the control circuit Using the 100 uA setting will provide 200 of feedback The larger feedback signal means that the temperature will be more tightly controlled Notice also that the lower slope of the curve at the higher temperatures results in a sm
18. register can be read using the TEC ENABle COND query See the Status Reporting section of the 3916 or the 3908 manual for more information regarding condition reporting Examples TEC ENAB COND 9 action the only conditions from the selected module that will be reported to the 3916 or the 3908 Status Byte are the Temperature Limit 8 and Current Limit 1 conditions 08 05 LDC 3916558 m 45 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC ENAB le COND FRONT PANEL REMOTE The TEC ENABIe COND query returns the value of the selected module s TEC Condition Status Enable register 0 0 Parameters The response is the sum of the following 1 Current Limit 256 2 Voltage Limit 512 In Tolerance 4 1024 Output On 8 Temperature Limit 2048 N A 16 N A 4096 N A 32 N A 8192 64 Sensor Open 16384 N A 128 Open Circuit 32768 N A Notes The selected module s enabled TEC conditions can be set by using the TEC ENABIe COND command The TEC condition status can be monitored by the TEC COND query Examples TEC ENAB COND response 640 means that only the following two conditions will be reported in summarized form to the 3916 s Status Byte In Tolerance 512 and Open Circuit 128 46 m LDC 3916558 Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC ENABle EVEnt FRONT PANE REMOTE The TEC ENABle EVEnt command sets the selected module s
19. 11 Error in conversion to character pointer E 212 Error in conversion to byte pointer E 214 Response is too long to output E 222 Set value is over range E 223 Set value is under range E 226 Error in arbitrary block specification E 402 Open Sensor caused TEC to turn off E 403 Open Module Open Circuit caused TEC to turn off E 404 Current Limit caused TEC to turn off E 405 Voltage Limit caused TEC to turn off E 407 Temperature Limit caused TEC to turn off E 409 Sensor Change caused TEC to turn off R 410 Out of Tolerance condition caused TEC to turn off E 415 Sensor Shorted caused TEC to turn off E 416 New setting resulted in invalid TEC setpoint E 601 Internal error recalled bin has incorrect checksum settings to not match bin E 602 Internal error task synchronization error E 620 Internal error resource unavailable E 621 Internal error message undeliverable to task E 622 Internal error could not send message to mainframe E 623 Internal error could not convert setting to valid setpoint E 710 Internal error AC Power Low error detected E 711 Internal error AC Power Low error detected E 712 Internal error Over temperature error found on internal sensor E 713 Internal error Power brown out error detected E 714 Internal error Writing to display
20. 3 Error Indicators OPERATIONS Error Indicators Error Number Error Condition Probable Cause E402 Open Sensor An open circuit has been detected in the thermistor connections Check the connections to the thermistor and to pins 7 and 8 on the 15 pin connector TE Module Open E403 An open circuit has been detected in the TEC module connections Check the wires and connections to the TEC module and to pins 1 2 and 3 4 on the controller s 15 pin connector E404 Current Limit The controller reached the current limit and the current limit bit of the Output Off Enable register has been set using GPIB E405 Voltage Limit The output driver has reached its voltage limit and the voltage limit bit of the Output Off Enable register has been set using GPIB E407 Temperature Limit The measured temperature has reached the high temperature limit setting E409 Sensor Changed The sensor current was changed while the output was on and the Sensor Changed bit of the Output Off Enable register has been set using GPIB E410 Tolerance error The output dropped out of tolerance and the Tolerance bit in the Output Off Enable register has been set E415 Sensor Shorted The measured thermistor resistance is less than 250 and the Sensor Shorted bit in the Output Off Enable register has been set E416 Temperature Conversion error The temperature setpoint cou
21. EC MODE TEC SET The following commands may be reached directly from the TEC command path TEC COND TEC ITE TEC SYNCI TEC CONST TEC LASOFF TEC SYNCR TEC CONST TEC MODE TEC SYNCT TEC CONV R TEC OUT TEC SYNCV TEC CONV T TEC OUT TEC T TEC EVEnt TEC R TEC T TEC GAIN TEC R TEC TOL TEC GAIN TEC SEN TEC TOL TEC ITE TEC SEN TEC V Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC CAL FRONT PANEL REMOTE The TEC CAL command path is used to access the selected module s TEC calibration commandas The following commands may be reached directly from the TEC CAL command path TEC CAL ABORT TEC CAL DEFAULT TEC CAL ITE TEC CAL MEAS TEC CAL SEN TEC CAL STATUS TEC CAL V TEC CAL VALUE TEC CAL ABORT FRONT PANEL REMOTE The TEC CAL ABORT command is used to exit the selected module s TEC calibration procedure without changing the calibration values 9 2 Nem Parameters None Notes If this command is issued while the LDC 3916558 3 Amp Temperature Controller is in a TEC calibration the calibratio will be terminated and the module will operate with the same calibraiton values as before the calibration mode was started This command is intended for use after a false or invalid calibration measurement is entered or to exit calibration mode before any measurements have been entered Examples TEC1 CAL ABORT action the module exits calibration mode 08 05 LDC 3916558 37
22. L STATus REMOTE The TEC CAL STATus query is to determine whether the selected module is ready for a calibration value PO a HOAs PO Parameters None The response will be an lt nrf value gt 0 Not Ready for Measurement 1 Ready for Measurement 2 Calibration Completed 3 Calibration Aborted Notes If the calibration is aborted the status value will remain 3 until a calibration is started again Examples TEC CAL STAT response 1 means the module is ready for a calibration measurement to be entered using the TEC CAL MEAS command TEC CAL STAT response 2 means the module has completed calibration TEC Cal Stat response 0 means the module is not yet ready for the TEC calibration measurement value to be entered TEC CAL V FRONT PANEL REMOTE The TEC CAL V command is used to initiate the calibration procedure for the selected module s TEC TE voltage measurement Parameters None Notes This mode calibrates the TE voltage measurement After this command is issued the selected module will enter voltage measurement mode See the Service Reference portion of this manual for complete calibration instructions Examples TEC CAL V action the selected module enters calibration mode for TE voltage TEC CAL VALUE FRO REMOTE The TEC CAL VALUE query is used at the factory only 40 m LDC 3916558 Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Command
23. MEAS value in e g TEC CAL MEAS 45 678 Note The internal cal procedure will store the measured value that you enter and briefly change its measurement status to O to indicate that it is not yet ready for another measurement 72 LDC 3916558 IN ILX Lightwave TROUBLESHOOTING Remote Calibration of the 3916558 3 Amp Temperature Controllers g Connect the 400 resistor and allow the measurement to settle for at least 10 seconds h Checkto see if the internal cal procedure is ready for a measurement send the following query to the module TEC CAL STATUS The cal procedure is ready for a measurement if it returns the value 1 Query the status until the value that is returned is 1 When the status query returns 1 enter the value of the second resistor i Enter the exact resistance value that you previously measured in of the second resistor by sending the following command TEC CAL MEAS value in e g TEC CAL MEAS 398 877 The internal cal procedure will now complete the calibration of the 10 LA sensor measurement circuit It indicates that it is finished by responding to the status query with the value 2 Follow the same procedure for the 100 uA sensor calibration except use the following command to start the cal TEC CAL SEN 1 For the 100 A sensor calibration use 4 kQ for the first resistor and 40 for the second 08 05 LDC 3916558 8 73 74 TROUBLESHOOTING 9 ITE Current Cal
24. RONT PANEL REMOTE The TEC MODE query returns the selected module s TEC control mode POC POH os Parameters None The response is a character response representing the control mode The possible responses are R and ITE without quotes Notes Constant current mode is sometimes useful in a multi stage TEC system or in a system where the heat load is constant and well known Examples response T means that the selected module s TEC is in constant temperature control mode TEC OUTput FRONT PANEL REMOTE The TEC OUTput command turns the selected module s TEC output on or off white nrf j space value Parameters An nrf value 1 on 0 off Notes After the selected module s 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 TEC OUT 1 action turns the selected module s TEC output on TEC OUT action turn off the selected module s TEC 08 05 LDC 3916558 57 A COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC OUTput FRONT PANEL REMOTE The TEC OUTput query returns the selected module s TEC output state POC POLE PO Parameters None The response is an lt nrf value gt Notes Although the output is on the output may not have reached the se
25. T PANEL REMOTE The TEC SEN command sets the selected module s TEC thermistor sense current white nrf J space gt value gt Parameters nrf value representing the desired thermistor sense current 1 represents 100 pA 2 represents 10 pA Notes The sense current is applied through the thermistor and the resulting voltage is measured by the 3916558 module The measured voltage range is 0 5 V The best sense current to use depends on the expected thermistor resistance at the setpoint In general use 100 pA for a resistance less than 50 and 10 for larger values The largest possible voltage swing in the vicinity of the setpoint will result in the best stability Examples TEC SEN 1 action sets the selected module s TEC thermistor current to 100 LA 08 05 LDC 3916558 m 59 A COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC SEN FRONT PANEL REMOTE The TEC SEN query returns the selected module s TEC thermistor sense current Por 999x999 Parameters None The response is an nrf value representing the sense current 1 represents 100 2 represents 10 pA Notes The sensor current is always applied regardless of the control mode Examples TEC SEN response 1 means that the sense current is 100 LA TEC SET FRONT PANEL REMOTE The TEC SET command path is used to access the selected module s TEC set point queries The following queries may be reached
26. TEC Event Status Enable register The bits in this register determine the TEC events that are summarized in the 3916 or the 3908 white nrf space gt value gt Parameters nrf value whose sum represents the events that are enabled 1 Current Limit Occurred 256 Sensor Type was Changed While Output was On 2 Voltage Limit Occurred 512 In Tolerance Condition was Entered or Exited 4 1024 Output Turned Off 8 Temperature Limit Occurred 2048 N A 16 4096 N A 32 N A 8192 64 Sensor Circuit Opened 16384 N A 128 Output Circuit Opened 32768 N A Open Circuit Notes The contents of this register are read with the TEC ENABle EVEnt query Events can be monitored using the TEC EVE query See the Status Reporting section of the 3916 or the 3908 manual for more information regarding event reporting Examples TEC ENAB EVENT 136 action only the Open Circuit 128 and Temperature Limit 8 events will be reported in summarized form to the 3916 or the 3908 s Status Byte 08 05 LDC 3916558 47 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC ENABle EVEnt FRONT PANEL REMOTE The TEC ENABle EVEnt query returns the contents of the selected module s TEC Event Status Enable register HO Parameters None The response is the sum of the following 1 Current Limit Occurred 256 Sensor Type was Changed While Output was On 2 Voltage Limit Occurred 512 In Tolerance Condition was E
27. V h Enter the exact resistance value into the RReal adjust field and press Enter The internal calibration procedure will make its calculations and when it has finished it will indicate so on the screen Follow a similar procedure for the 100 uA sensor calibration except use the Therm100 Cal soft key and use a 4 and a 40 resistor 08 05 LDC 3916558 m 69 TROUBLESHOOTING ITE Current Calibration ITE Current Calibration The following procedure is for calibrating the TE current source The internal calibration procedure sets the current to two negative values and two positive values You must enter the exact current that you measure at each of these points The internal procedure will then use this information to calibrate the current source setpoint measurement and limit circuits a With the output off connect a 19 50 W resistor across the TEC output terminals TE Module pins 1 amp 2 and TE Module pins 3 amp 4 Positive current flows from the module pins to the module pins b Connect a calibrated DMM across the load resistor You will be calculating TE current ITE in the following manner using Ohm s Law I E R where E is the accurately measured voltage across the resistor R is the accurately measured load resistance and l is the calculated current in Amps ILX recommends a 4 point probe resistance measurement Note We recommend that the load resistor be temperature controlled duri
28. aller feedback signal It may be necessary if you are controlling to higher temperatures to use a thermistor with a different curve If you do not have the option of selecting a thermistor use the following guideline If your desired setpoint results in a thermistor resistance of less than 50 kQ use the 100 uA setting Otherwise use the 10 uA setting Setting Safety Limits TEC modules can be damaged by excessive current and module manufacturers will typically specify a maximum safe operating current for their module The 3916558 controller provides a current limit feature ILim that allows you to set the maximum current that the controller will supply The ILim setting is in the page 2 menu its units are Amperes It is normal for the controller to be in current limit especially when the load temperature is far from the setpoint An indication ILim will appear on the screen when the controller is in a current limit condition 14 LDC 3916558 Lightwave OPERATIONS Guidelines If the load you are cooling generates more heat than the controller and module can remove the load will eventually heat up In fact if the TEC module s heat sink becomes heat saturated the TEC current may actually start heating the load due to the resistance of the module This situation is sometimes referred to as thermal runaway and can cause a load to become damaged To help avoid thermal runaway damage the 3916558 s controller pr
29. ame with the appropriate card guides one on top and one on the bottom Carefully slide the module into the mainframe slot until the connector is seated You will have to push a little harder to seat the module The rear panel of the module should be flush with the mainframe when properly inserted Fasten the module to the mainframe with two screws located at the top and bottom of the module rear panel LDC 3916558 Lightwave 08_05 INTRODUCTION AND SPECIFICATIONS CHAPTER 1 Specifications Specifications Temperature Control Temperature Control Range 999 to 1509 Thermistor Setpoint Resolution and Accuracy 209 to 20 0 1 C 0 2 C 20 C to 50 C 0 2 C 0 2 C Short Term Stability 1 hour lt 0 007 C Long Term Stability 24 hours lt 0 01 C Output Type Bipolar current source Compliance Voltage 8 VDC Maximum Output Current 3A Maximum Output Power 24 W Current Noise and Ripple 2 mA rms Current Limit Range 0 1 to 3 10 A Current Limit Set Accuracy 0 05 A Control Algorithm Gain adjustable from 1 to 127 Temperature Sensor Types Thermistor 2 wire NTC Thermistor Sensing Current 10 uA 100 uA Useable Thermistor Range 25 to 450 000 O typical User Calibration Steinhart Hart 3 constants TEC Measurement Display Temperature Range 99 9 C to 199 99 Accura
30. are required The first one represents C1 the second is C2 and the third is C3 The range for all three constants is 99 999 to 99 999 The module scales each value by an exponential value that is appropriate for that constant s part in the Steinhart Hart equation Notes If any one of the values is less than 99 999 and under range error will be generated Values over 99 999 will cause an over range error In either case non of the constants will be modified A thermistor s Steinhart Hart coefficients are typically supplied by the thermistor manufacturer Examples TEC CONST 0 9 1 2 2 3 action sets the selected module s TEC Steinhart Hart coefficients to C1 2 0 9 C2 2 1 2 C3 2 23 TEC CONST FRONT PANEL REMOTE The TEC CONST query returns the values of the selected module s Steinhart Hart coefficients 0 6 Parameters The response data represents the values of C1 C2 and C3 in that order Notes These values are pre scaled so that the exponential value is not given The actual value of C1 is scaled by 10E 3 C2 by 10E 4 and C3 by 10E 7 Examples TEC CONST response 0 9 1 1 2 2 C1 C2 and C3 are 0 9 1 1 and 2 2 42 m LDC 3916558 Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands d TEC CONV R REMOTE The TEC CONV R command converts thermistor resistance to temperature 9C Parameters nrf value that corresponds to a resistance in
31. ating the Temperature Controllers from the Front Panel 7 General Front Panel 7 Example Setup sace ca kr akk sneket Me REY EGRE dees 8 Guidelines 22 22 ee E c eate RR Y e DR Icd Roe Ron 12 Choosing Control Mode 12 Setting cce oa oa Po dd e cs ee 13 Setting Sensor 13 Lightwave LDC 3916558 i ko m a Setting Safety 14 Default Settings 16 TEC Error Indicators 16 Chapter Remote Operations Remote Configuration 19 LDC 3916558 3 AMP Temperature Control Module Command Set 19 LDC 3916558 3 Amp Temperature Controller Often Used Commands 21 Command Timing and Completion 21 Status Reporting acc ees ud enis RR BRE ated ded E ud 22 Status Registers 4 cu e eae ae UR n RD DR RD 22 Output Off Registers 25 Error Messages 26 Chapter 4 Command Reference GPIB Commands 30 LDC 3916558 Device Dependent Commands 33 Chapter 5 Trouble
32. ce 0 10 Sensor Shorted 1 11 N A 0 12 N A 0 13 N A 0 14 N A 0 15 N A 0 The default factory settings for the TEC Output Off registers are also shown in Table 3 2 The default contents of each register are 1224 decimal The contents of the Output Off registers are not affected by the PSC Power On Status Clear command 08 05 LDC 3916558 8 25 3 26 El REMOTE OPERATIONS Error Messages Error Messages LDC 3916558 This section contains descriptions of the errors that are specific to the LDC 3916558 modules These are the error codes that the module reports in response to the MODERR query Refer to either the LDC 3916 or the LDC 3908 Mainframe Instruction Manual Chapter 3 for a list of LDC 3916 and LDC 3908 mainframe error codes and descriptions the codes returned in response to the ERR query During remote operation the recommended method for error testing is as follows First read the system errors and module error summary with the ERR query This will allow you to error check the LDC 3916 and the LDC 3908 as a whole If any module errors are present the corresponding bit of the module error summary will be set For example suppose the 3916 responds to an ERR query with the string 0 0000000001100000 The O to the left of the comma indicates that there are no mainframe errors and the binary representation to the right of the comma indicates that ther
33. considerations and instructions It also contains some maintenance information and specifications AN warninG If any of the following symptoms exist or are even suspected remove the LDC 3916558 Module from service Do not use the module until trained service personnel can verify safe operation Visible damage Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions If necessary return modules to ILX Lightwave for service and repair to ensure that safety features are maintained Product Overview The 3916558 module is intended to be used within a LDC 3916 16 channel or LDC 3908 8 Channel Laser Diode Controller Mainframe The module contains a single three ampere independent temperature controller that drives a thermoelectric cooler TEC The temperature controller features a bi polar current driver that works with most TEC modules to deliver precise temperature control over a wide range of temperatures The temperature controller operates using thermistor type temperature sensors only The LDC 3916558 features a Mi ILX Lightwave LDC 3916558 1 2 4 INTRODUCTION AND SPECIFICATIONS Installing the Module into the LDC 3916 or LDC 3908 Mainframe TEC module voltage measurement selection of thermistor current range and control loop gain adjustment from 1 to 127 Initial Inspection When you receive your LDC 3916558 3 Amp Temperature Control Module check fo
34. cted module s TEC Corp emo Parameters None Notes In this mode TE current is kept constant regardless of variations in load temperature Examples TEC MODE ITE action selects constant TE current control mode LDC 3916558 m 55 56 LDC 3916558 A COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC MODE R FRONT PANEL REMOTE The TEC MODE R command selects constant thermistor resistance mode for the selected module s TEC PON Parameters Notes Since thermistor resistance is a function of temperature this mode also controls load temperature It bypasses the use of the Steinhart Hart conversion for setpoint calculation This allows control of the load temperature in cases where a thermistor s resistance at a desired temperature is know but its Steinhart Hart coefficients are not known Examples TEC MODE R action selects constant thermistor resistance control mode TEC MODE T FRONT PANEL REMOTE The TEC MODE T command selects constant temperature mode for the selected module s TEC Parameters None Notes Constant temperature mode is the most frequently used control mode Changing control modes causes the selected module s TEC to be turned off Examples TEC MODE T action selects constant temperature control mode for the selected module s TEC temperature controller Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC MODE F
35. cy 40 59C Thermistor Resistance 10 uA setting Range 0 01 to 450 00 Accuracy 0 05 Thermistor Resistance 100 uA setting Range 0 001 to 45 000 Accuracy 9 40 005 TE Current Range 3 00 to 3 00 A TE Current 0 04 A LDC 3916558 3 INTRODUCTION AND SPECIFICATIONS Specifications 4 LDC 3916558 TE Current Resolution 0 01 A Voltage Range 10 75 to 10 75 V Voltage Resolution 100 mV 1 mW through GPIB Voltage Accuracy 70 mV 20 mV through GPIB 1 All values relate to a one hour 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 quoted for a typical 10 thermistor and 100 uA current setting for 5 C to 50 C and a typical 10kO thermistor and a 10 uA current setting for 209C to 5 Accuracy figures are relative to the calibration standard Both resolution and accuracy are dependent upon the user defined configureation of the instrument 4 Over any one hour period half scale output controlling an LDM 4412 mount 25 C with 10kQ thermistor on 100 uA setting 5 Over any 24 hour period half scale output controlling an LDM 4412 mount 25 C with 10kQ thermistor on 100 uA setting 6 Measured at 2A output over a bandwidth of DC to 25 MHz 7 Thermistor current software selectable by fro
36. d around your production schedule night or day seven days a week Please call ILX Customer Support at 800 459 9459 for information about calibrating your instrument Lightwave LDC 3916558 67 TROUBLESHOOTING Calibration Overview Calibration Overview You must perform several calibrations to completely calibrate the 3916558 The calibration consists of calibrating the temperature sensors the TE bipolar current source and the TE load voltage measurement The current limit is calibrated internally by the instrument using measurements supplied by the user as part of the calibration process Your 3 Amp Temperature Controller must be calibrated while installed in an LDC 3916 or an LDC 3908 mainframe with the case closed They should be calibrated every 12 months or whenever performance verification indicates that calibration is necessary such as differences between set point and measurement display values that exceed the accuracy specification Calibrate the instrument under laboratory conditions ILX Lightwave recommends calibration at 23 C 1 0 C When necessary however the 3916558 3 Amp Temperature Controllers may be calibrated at their intended use temperature if this is within the specified operating temperature range of 0 40 The LDC 3916558 should be allowed to warm up for at least 1 hour at half power before calibration Recommended Equipment Recommended test equipment for calibrating the LDC 3916558 3 A
37. ds cuapter 4 Parameters Function TEC EVE none Queries the contents of the Event Status Register TEC GAIN 1 Sets the control loop gain TEC GAIN none Queries the control loop gain setting TEC ITE 1 Enters the constant current setting TEC ITE none Queries the measure output current TEC LIM ITE 1 Enters the Current Limit setting TEC LIM ITE none Queries the Current Limit setting TEC LIM THI 1 Enters the Temperature Limit setting TEC LIM THI none Queries the Temperature Limit setting TEC LASOFF 2 Enters the channel and source of the laser to turn off TEC LASOFF none Returns the channel and source of the laser to turn off TEC MODE ITE none Selects constant current control mode TEC MODE R none Selects constant thermistor resistance control mode TEC MODE T none Selects constant temperature control mode TEC MODE none Queries the control mode TEC OUT 1 Turns the output on or off TEC OUT none Queries the state of the output on or off TEC R 1 Enters the constant thermistor resistance setting TEC R none Queries the measured thermistor resistance TEC SEN 1 Selects sensor thermistor type low or high resistance TEC SEN none Queries the selected sensor type TEC SET ITE none Queries the constant current setpoint TEC SET R none Queries the constant resistance setpoint TEC SET T none Queries the constant temperature
38. e are errors on channels 7 and 6 Module 16 is on the left module 1 is on the right for the 3908 there are only 8 bits after the comma Read the module errors using the MODERR query For example Chan 7 Moderr will return the errors in module 7 and Chan 6 Moderr will return any errors in module 6 For more information on LDC 3916 and LDC 3908 mainframe errors refer to the LDC 3916 or the LDC 3908 Instruction Manual Chapter 3 Error Code Explanation E 103 Length of arbitrary block is different from expected length E 104 Parameter is an undefined numeric type E 105 Parameter has an invalid exponent E 106 A digit was expected in the parameter but was not found E 114 Specified arbitrary block length is invalid E 123 Command is not found E 126 Wrong number of parameters for command E 201 Parameter value out of range E 202 Error in conversion of parameter type E 203 Command is a secure command but secuire commands are disabled E 204 Suffix is invalid E 205 Expected Boolean parameter is invalid E 206 Error in conversion to signed 16 bit integer E 207 Error in conversion to unsigned 16 bit integer E 208 Error in conversion to signed 32 bit integer E 209 Error in conversion to unsigned 32 bit integer Lightwave REMOTE OPERATIONS mE 3 Error Messages CHAPTER Error Code Explanation E 210 Error in conversion to floating point number E 2
39. each of these points and send the measurements to the module over GPIB The internal procedure will then use this information to calibrate the TE voltage measurement circuit a With the output off connect a 5 O 50 W load resistor across the TEC output terminals TE Module pins 1 amp 2 and TE Module pins 3 amp 4 b calibrated voltmeter across the load resistor Begin the TE voltage calibration by sending the following command over GPIB TEC CAL V The internal cal procedure will begin by setting the TE output current to approximately 33 of its negative full range Allow the current to settle for at least 10 seconds Check to see if the internal cal procedure is ready for the measurement Send the following query to the module TEC CAL STATUS The cal procedure is ready for a measurement if it returns the value 1 Query the status until the value that is returned is 1 d Enter the actual measured TE voltage TEC CAL MEAS voltage in Volts e g TEC CAL MEAS 2 91 Note The internal cal procedure will store this value and briefly change its measurement status to 0 to indicate that it is not yet ready for another measurement This will occur after each time a new measurement is entered e Thecontroller will set the output current to approximately 33 of its positive output range Allow the current to settle for at least 10 seconds f Checkto see if the internal cal procedure is ready for the m
40. easurement Send the query to the module TEC CAL STATUS The cal procedure is ready for a measurement if it returns the value 1 Query the status until the value that is returned is 1 g Enter the actual measured TE voltage TEC CAL MEAS voltage in Volts e g TEC CAL MEAS 2 85 After you have entered the second measured voltage the internal calibration procedure will perform the calibration for the voltage measurement circuit The cal procedure will then set the status to the value 2 to indicate that it has finished This ends the calibration guide 76 LDC 3916558 Lightwave 08_05 TROUBLESHOOTING Troubleshooting Guide Troubleshooting Guide This section is a guide to troubleshooting the 3916558 3 AMP Temperature Controller Modules Some of the more common symptoms are listed here and the appropriate troubleshooting actions are given We recommend that you start at the beginning of this guide Read the symptom descriptions and follow the steps for the corrective actions that apply If you encounter problems that are beyond the scope of this guide contact your ILX Lightwave customer service representative Symptom Corrective Actions LDC 3916 or LDC 3908 unit Check AC power line voltage and power cord connection will not power up Check fuse on instrument back panel Power on but outputs have This may occur if the instrument loses power AC line briefly or line been shut off Instrum
41. ely calibrating the 100 uA and 10 uA thermistor current sources so that the thermistor resistance measurements for these ranges will meet the stated accuracy specifications a Install the module into a 3916 or a 3908 mainframe Turn on the mainframe and allow it to warm up for at least one hour b Using the multimeter measure and record the exact resistance of your metal film resistors You should know the exact resistance of the resistors to at least 10 Note For best accuracy in your calibration a four point probe resistance measurement is recommended After connecting the probe to the calibration resistor wait at least thirty seconds before recording the resistance value Heat from your fingers can change the value of the resistance c Connect a resistor of approximately 50 k to the TE connector s sensor pins pins 7 and 8 d Begin the 10 LA sensor calibration by sending the following command over GPIB TEC CAL SEN 2 This starts the internal 10 uA sensor calibration procedure Allow the measurement to settle for at least 10 seconds e Check to see if the internal cal procedure is ready for a measurement send the following query to the module TEC CAL STATUS The cal procedure is ready for a measurement if it returns the value 1 Query the status until the value that is returned is 1 f Enter the exact resistance value that you previously measured in k of the first resistor by sending the following command TEC CAL
42. emperature resistance and the setpoint temperature resistance The proportionality constant of this circuit is the Gain setting in the page 3 menu A higher value in this setting will cause more current to flow when the load temperature differs from the setpoint temperature thus causing a quicker correction More gain is not always better though as the thermal mass of the load may cause a situation where the load temperature oscillates about the setpoint Selecting the proper gain for your particular application is normally an empirical procedure with heat load thermal mass maximum desired settling time and allowable overshoot all playing a part A common method for selecting the gain to get the fastest temperature settling time is the following set the gain to 30 turn on the output and allow the load to settle then increase the gain until the load temperature oscillates about the setpoint Then decrease the gain by a few points until the oscillations cease The control circuit also includes an integrating section The longer the load temperature is different from the setpoint the more current the integrating section contributes An integrating term is indispensable in a system that has inertia such as thermal mass The integrating circuit is not adjustable Setting Sensor Current You can select a thermistor sense current of 10 uA or 100 pA in the page 3 menu When deciding which current and thermistor to use keep
43. ent voltage drops below specification If instrument is locked up power may be locked up or it off and then on to restart instrument resets itself Power on but no TE current Check the load connections and operating mode output Power on but temperature is If SENSOR OPEN indication check the sensor connections not controlled Check that the proper sensor current range is selected The 10 LA setting is required if the thermistor resistance is more than 50 Check that C1 C2 and C3 are the correct values for your thermistor Check that the GAIN setting is not too low and that the ILim value is not too low for your thermal load Unable to adjust output or Ensure that the desired parameter is highlighted parameter Ensure that you are not trying to set TSet to a higher value than TLim or ISet higher than ILim Output goes 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 the Operating in Remote Control portion of this manual for more information Check the sensor connections at the module and the load
44. et the Temperature setpoint TSet the high temperature limit TLim and the control mode Mode This page also displays measured temperature T TE module current l and measured TEC module voltage V You can also turn the controller on or off from this page To enter the temperature set point press the 4 hardkey until the TSet parameter is highlighted Enter 15 5 using the keypad and press Enter Note whenever you use the keypad to enter a parameter value you must press Enter within three seconds or the parameter will revert to its previous value Now press the 4 hardkey until the TLim parameter is highlighted Enter 40 0 using the numeric keypad Now press the 4 hardkey until the Mode parameter is highlighted Press the INC hardkey in the ADJUST area until T is displayed Figure 2 4 TEC p1 Menu From the TEC page 1 menu press the F4 softkey it is attached to the down arrow box on the page 1 menu Now you will see the TEC page 2 menu Figure 2 5 TEC p2 Menu In the TEC page 2 menu you can set the constant resistance setpoint the constant current setpoint and the current limit Press the 4 hardkey until the ILim parameter is highlighted Enter 3 0 using the numeric keypad The RSet parameter is for constant resistance control mode and the ISet parameter is for constant current mode 08 05 LDC 3916558 9 10 LDC 3916558 OPERATIONS Operating the Temperature Controllers from the Front Panel
45. g keys in this order Enter For information regarding firmware upgrades contact ILX Customer Support 08 05 LDC 3916558 11 J OPERATIONS Guidelines Guidelines This section presents some guidelines intended to assist you in selecting the optimal settings for your application Choosing Control Mode In the preceding example you configured a controller to maintain a load at a constant temperature The 3916558 controller uses a thermistor to measure temperature A negative temperature coefficient NTC thermistor is a device whose resistance decreases as its temperature increases The sense current that the controller provides through the thermistor results in a voltage across the thermistor This voltage is used as a feedback signal by the 3916558 s control loop to maintain a constant temperature In both constant temperature and constant resistance modes the quantity that is maintained constant by the controller is the thermistor resistance In constant temperature mode the 3916558 converts the temperature setpoint to a thermistor resistance setpoint The 3916558 uses the Steinhart Hart equation to convert a temperature to a resistance The equation describes the nonlinear resistance vs temperature characteristics of typical thermistors 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
46. ghtwave REMOTE OPERATIONS Status Reporting out of tolerance To enable that event to be reported set bit 9 in TEC s Enable Event register using the command TEC ENAB EVE 512 This allows an In Tolerance event to be passed to the ALLEVE register in either the 3916 or 3908 mainframe You can monitor the ALLEVE status by using the ALLEVE query you can monitor the summary using the STB query To generate the SRQ interrupt for our example you must also set the Service Request Enable Register using SRE 1 to allow the ALLEVE summary to generate the interrupt TEC Condition Status Register TEC COND 151433 12 1 100 9 8 7 6 5 4 3 2 1 0 bit wise LOGICAL OR LOGICAL AND ETTET TEC Condition Status Enable Register TEC ENABle COND lt nrf gt TEC ENABle COND To ALLCOND Register eo TEC Condition Bit Reference 0 Current Limit 8 n a 1 Voltage Limit 9 In Tolerance 2 n a 10 Output On 3 Temp Limit 11 n a 4 n a 12 n a 5 n a 13 n a 6 Sensor Open 14 n a 7 Module Open 15 n a Figure 3 2 LDC 3916558 Status Condition Registers The bits in the module s Condition Register reflect as closely as possible the state of the instrument These bits are therefore dynamic they are set or cleared as conditions come or go 08 05 LDC 3916558 m 23 a REMOTE OPERATIONS PERROS Status Reporting TEC Event Status Register TEC EVEnt
47. he multimeter measure and record the exact resistance of your metal film resistors You should know the precise resistance of the resistors to at least 10 Note For best accuracy in your calibration a four point probe resistance measurement is recommended After connecting the probe to the calibration resistor wait at least thirty seconds before recording the resistance value Heat from your fingers can change the value of the resistance c Enter the 10 pA sensor calibration mode by pushing the DISPLAY MAIN front panel button then the Sys Config soft key then the Cal soft key then the Cal TEC soft key then the Therm10 Cal soft key The module s 10 uA calibration screen will appear d Press the Start soft key The internal calibration procedure will begin and the screen will prompt you to connect a 50 kO resistor e Connect a resistor of approximately 50 you should know the exact resistance value to atleast 1 to the TE connector s sensor pins pins 7 and 8 Allow the measurement to settle for at least 10 seconds f Enter the exact resistance value in into the RReal adjust field and press Enter Be sure not to enter more than 7 characters including the decimal point After an internal calibration the screen will now prompt you to attach a 400 resistor g Connect a resistor of approximately 400 again you should know the exact value to within 19 and allow the measurement to settle for at least 30 seconds
48. he selected module s TEC measured TE voltage is 08 05 3 4 V LDC 3916558 m 65 COMMAND REFERENCE LDC 3916558 Device Dependent Commands 66 7 LDC 3916558 Lightwave CHAPTER 5 TROUBLESHOOTING El a E a El w a El mH E E LI a EH This chapter describes calibration of your LDC 3916558 3 Amp Temperature Control Module Descriptions of the required test instruments calibration conditions and the detailed procedures for calibration of the instrument s Temperature Controllers are included A troubleshooting guide is also offered for common failure symptoms This chapter is divided into three major sections Local front panel calibration remote through the GPIB Interface calibration and a troubleshooting guide 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 efficiently 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 performe
49. ibration ITE Current Calibration LDC 3916558 The following procedure is for remotely calibrating the TE current source The internal calibration procedure sets the current to two negative values and two positive values You must measure the current at each of these points and send the measurements to the module over GPIB The internal procedure will then use this information to calibrate the current source setpoint measurement and limit circuits a With the output off connect a 1 50 W resistor across the TEC output terminals TE Module pins 1 amp 2 and TE Module pins 3 amp 4 Connect a calibrated DMM across the load resistor You will be calculating TE current ITE in the following manner using Ohm s Law I E R where E is the accurately measured voltage across the resistor and R is the accurately measured load resistance lis the calculated current in Amps A 4 point probe resistance measurement is recommended Note We recommend that the load resistor be temperature controlled during the calibration The current may be measured directly using an ammeter with a range of at least 3 5 A and accurate to within 0 01 A If you use the ammeter approach you should connect the ammeter in series with a load resistor with a nominal value of 10 Begin the ITE calibration by sending the following command over GPIB TEC CAL ITE The internal cal procedure will begin by setting the TE output current to approxima
50. ion sets the selected module s TEC control loop gain to 40 08 05 LDC 3916558 7 51 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC GAIN FRONT PANEL REMOTE The TEC GAIN query returns the value of the selected module s TEC control loop gain eor OROROORO Parameters None The response is an integer value between 1 and 127 Notes The optimum gain to use depends on the characteristics of the device you are controlling Examples TEC GAIN response 33 means the selected module s measured TEC control loop gain is set to 33 TEC ITE FRONT PANEL REMOTE The TEC ITE command sets the selected module s TEC constant current setpoint white nrf space gt value gt Parameters nrf value representing the ITE setpoint in Amps Notes This command will modify the ITE setting regardless of control mode but the setting will only be used in constant current mode This setting is read using the TEC SET ITE query In constant temperature or constant resistance mode the 3916558 applies a positive current to cool a device A negative current is assumed to heat a device Examples TEC ITE 0 6 action sets the selected module s TEC ITE setpoint to 0 6 Amps TEC ITE FRONT PANEL REMOTE The TEC ITE query returns the value of the selected module s measure TEC current Parameters The response is an nrf value representing the measured ITE current in Amps
51. ld not be converted to a valid control setting This can happen if the Steinhart Hart constants are invalid E435 Mode Changed The TEC mode was changed while the TEC output was on The errors that are enabled in the Output Off Enable register by default at power up are Open Sensor TEC Module Open Temperature Limit and Sensor Shorted The Output Off Enable register is not saved at power down LDC 3916558 n 17 OPERATIONS TEC Error Indicators 18 LDC 3916558 Lightwave CHAPTER 3 REMOTE OPERATIONS a a H E H E B a a Almost everything that you can do from the front panel can also be done remotely In fact more features and information are available through the remote interface than are available from the front panel For example using the Enable Outoff command you can set up the module so that it will turn off if it goes into current limit You cannot do that from the front panel The following sections show you the fundamentals of operating your LDC 3916558 module remotely through the GPIB or RS 232 interfaces Remote Configuration Refer to either the LDC 3916 or LDC 3908 Instruction Manual Chapter 3 Operating in Remote Control for information concerning setup of GPIB or RS 232 remote communications That section also describes the use of IEEE 488 2 common commands LDC 3916 LDC 3908 mainframe commands and syntax LDC 3916558 3 AMP Temperature Control Module Command Set The LDC
52. llow the current to settle for at least 10 seconds at each step After you have entered the last actual current the internal calibration procedure will perform the calibration for the current setpoint measurement and limit circuits The screen will then display a message indicating that the calibration has finished 70 7 LDC 3916558 Lightwave TROUBLESHOOTING TE Voltage Calibration TE Voltage Calibration The following procedure is for calibrating the TE voltage measurement The internal calibration procedure sets the current to a negative value and a positive value You must enter the exact voltage that you measure at both of these points The internal procedure will then use this information to calibrate the voltage measurement circuit a With the output off connect a 5 50 W resistor across the output terminals TE Module pins 1 8 2 and TE Module pins 3 amp 4 b calibrated voltmeter across the load resistor c TE voltage calibration mode by pushing the DISPLAY MAIN front panel button then the Sys Config soft key then the Cal soft key then the Cal TEC soft key then the TE Volts Cal soft key The module s TE Volts calibration screen will appear d Press the Start soft key The internal calibration procedure will turn on the output and drive the TE current to approximately 3396 of its negative output range Allow the current to settle for at least 10 seco
53. mand sets the selected module s TEC high temperature limit value nrf Parameters nrf value that represents the selected module s TEC high temperature limit in degrees Celsius Notes By default the TEC output is turned off when the measured temperature exceeds this setting This feature can be disabled by clearing bit 3 in the Output Off Enable Register using the TEC ENABle OUTOFF command The range for the temperature limit is 0 to 199 9 9C Examples TEC LIM THI 87 5 action the selected module s TEC temperature limit to 87 5 54 LDC 3916558 Lightwave 08_05 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC LIMit THI FRONT PANEL REMOTE The TEC LIMit THI query returns the value of the selected module s TEC high temperature limit setting TOE POH Po Parameters None The response is an lt nrf value gt Notes High temperature limit is valid for all modes of operation There is no low temperature limit Examples TEC LIM THI response 92 0 means the selected module s TEC high temperature limit is 92 0 C MODE FRONT PANEL REMOTE The TEC MODE command path is used to access the selected module s TEC mode selection commands The following commands may be reached directly from the TEC MODE command path TEC MODE ITE TEC MODE T TEC MODE R TEC MODE ITE FRONT PANEL REMOTE The TEC MODE ITE command selects constant current mode for the sele
54. mp Temperature Control module is listed in Table 5 1 Equipment other than that shown in the table may be used if the specifications meet or exceed those listed Description Manufacturer Model Specification DMM Agilent 3457A DC Amps 1 0A 0 02 Resistance 10W 0 02 0 1 mA or 0 1 mV resolution Table 5 1 Recommended Test Equipment It will be necessary to connect various loads to the outputs of the module for the calibration procedure The devices required for the calibration loads are listed in Table 5 2 Temperature Sensor Thermistor Calibration 10 uA setting 50 kO resistor 196 1 4 W 400 resistor 196 1 4 W 100 LA setting 4 resistor 1 1 4 W 40 resistor 1 1 4 W Current Source Calibration 10 50W resistor low TCR Voltage Measurement Calibration 5O 50W resistor low TCR Table 5 2 Required Calibration Components 68 LDC 3916558 Lightwave TROUBLESHOOTING Local Calibration of the 3916558 3 Amp Temperature Controllers n Local Calibration of the 3916558 3 Amp Temperature Controllers Thermistor Calibration The following procedure is for calibrating the 100 and 10 uA thermistor current sources so that the thermistor resistance measurement for these ranges will meet the stated accuracy specifications a Install the module into a 3916 or a 3908 mainframe Turn on the mainframe and allow it to warm up for at least one hour b Using t
55. n in upper case lower case letters are optional Front Panel Remote Execution 7 m Front Panel A solid box means the command can be executed in that mode Command mnemonics in front panel local mode may vary The TECI LIMit ITE command sets TECI s current Pd limit value Command Description SYNTAX DIAGRAM TEC LIMit ITE Remote Syntax Diagram For Remote Commands TO e 9 Parameters Tells what parameters are lt expected and their type gt An nrf value refers to a flexible numeric notation IEEE488 2 Integer exponential or floating point may be used with the decimal radix Alternate radices may b selected 1i remote POINTS OF The current limit is in effect in all modes of operation mo di INTEREST operation Points of Interest Has special information about the command PARAMETERS An nrf value that represents the TECI limit current in A In local operation the limit current is entered by selecting the ILIM parameter in the CHANNEL TECI menu Examples EXAMPLES Shows typical statements using the command Tecl Lim ITE 0 9 action the TECI current limit is set to 0 9 A Figure 4 1 Command Description Format LDC 3916558 33 COMMAND REFERENCE LDC 3916558 Device Dependent Commands The following pages contain a reference for the device dependent commands of the LDC 3916558 3 Amp Temperature Control module It con
56. nds e Measure the voltage across the load resistor to within 0 01 V and enter the value in Volts into the VReal adjust area Press ADJUST ENTER Be sure to include the minus sign and do not enter more than five characters including the minus sign and decimal point If you do enter more than five characters and as a result the minus sign no longer appears on the left side of the display press the ADJUST CLEAR button and re enter the value Otherwise the internal calibration procedure will either abort or produce an incorrect calibration After you have entered the first voltage the internal cal procedure will set the output current to approximately 3396 of positive output range Measure the voltage across the load resistor enter this measurement in the VReal adjust area and press ADJUST ENTER The internal cal procedure will calibrate the TE voltage measurement circuit and the screen will display a Completed message 08 05 LDC 3916558 7 71 TROUBLESHOOTING Remote Calibration of the 3916558 3 Amp Temperature Controllers Remote Calibration of the 3916558 3 Amp Temperature Controllers The LDC 3916558 3 Amp Temperature Control Modules can be calibrated remotely using the GPIB Interface All of the required calibration commands are listed in Table 4 1 in Chapter 4 The procedures below are general guidelines for writing a program to calibrate your instrument Thermistor Calibration The following procedure is for remot
57. ng the calibration The current may be measured directly using an ammeter with a range of at least 3 5 A and accurate to within 0 01 A Connect the ammeter in series with a load resistor of value no more than 10 Enter the ITE calibration mode by pushing the DISPLAY MAIN front panel button then the Sys Config soft key then the Cal soft key then the Cal TEC soft key then the ITE Cal soft key The module s ITE calibration screen will appear d Press the Start soft key The internal calibration procedure will turn on the output and drive the TE current to approximately 9096 of its negative output range Allow the current to settle for at least 10 seconds e Calculate or measure the actual current to within 0 01 A and enter the value in Amps into the IReal adjust area press ADJUST ENTER Be sure to include the minus sign and do not enter more than five characters including the minus sign and decimal point If you do enter more than five characters and as a result the minus sign no longer appears on the left side of the display press the ADJUST CLEAR button and re enter the value Otherwise the internal calibration procedure will either abort or produce an incorrect calibration f Repeatthis process for the next three values of current that the internal procedure sets The next three current settings are approximately 30 of negative output range then 3096 of positive output range and finally 9096 of positive output range A
58. nly in effect when the operating mode is T Examples TEC SET T response 17 3 means the selected module s TEC temperature setting is 17 3 08 05 LDC 3916558 m 61 COMMAND REFERENCE LDC 3916558 Device Dependent Commands SYNCI REMOTE The TEC SYNCI query returns the selected channel s measured TE current in Amps Parameters None The response is an lt nrf value gt representing current in Amps Notes This is a synchronized measurement the TEC measurement system is connected to the current measure signal when this query is received A current measurement is made and the result is returned as the response After the measurement is made the measurement system result is returned as the response After the measurement is made the measurement system returns to its normal function switching between the various signals and measuring them The response time to this query is from 200 to 250 msec but the measurement is made as soon as the query is received In contrast the TEC ITE query returns immediately but the measurement can be up to 600 msec old Examples TEC SYNCI response 1 3 means the measured TE current is 1 3A TEC SYNCR FRI REMOTE The TEC SYNCR query returns the selected channel s measured thermistore resistance in Parameters None The response value is an nrf value representing resistance in Notes This is a synchronized measurement the TEC mea
59. nt panel or GPIB 8 Software limits of display range 9 Using a 100 thermistor controlling an LDM 4412 mount of 30 C to 25 C 10 Using a 10 kO thermistor controlling an LDM 4412 mount over 5 to 90 11 Voltage measurement accuracy while driving calibration load accuracy is dependent upon load used In keeping with our commitment to continuous improvement ILX Lightwave reserved the right to change specifications without notice or liability for such changes Lightwave CHAPTER 2 OPERATIONS El a E a El w a E El E B Ej Ei E a a This chapter introduces you to the operation of the LDC 3916558 front panel control functions It shows you how to use the 3916558 to control a load temperature It also gives instructions for connecting a load to a temperature controller s output We recommend that you review the contents of this chapter at a minimum before operating your new LDC 3916558 3 Amp Temperature Control Module The 3916558 module contains a 3 Amp temperature controller The 3916558 is intended for use with Thermoelectric Cooler TEC or Peltier modules Connecting to the Temperature Controller Use the 15 pin connectors on the rear panel of your 3916558 module to make connections to thermoelectric cooler TEC modules and their associated thermistors There are connections provided for current drive and temperature sensor Also provided are connections to earth ground chassis and to the modules
60. ntered or Exited 4 1024 Output Turned Off 8 Temperature Limit Occurred 2048 N A 16 4096 N A 32 N A 8192 64 Sensor Circuit Opened 16384 N A 128 Output Circuit Opened 32768 N A Open Circuit Notes This register is set using the TEC ENABle EVEnt command The selected module s TEC event status can be monitored by the TEC EVEnt query Examples reponse 512 means that the Tolerance Changed event is the only event that the selected module s TEC will report to the 3916 or the 3908 Status Byte 48 m LDC 3916558 Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands 00 4 TEC ENABle OUTOFF FRONT PAN Parameters Notes WARNING Examples 08 05 REMOTE The TEC ENABIe OUTOFF command sets the selected module s TEC Output Off Enable register The bits in this register specify the conditions that will cause TEC to automatically turn off nrf value white space An nrf value whose sum represents the enabled bits 1 Current Limit 256 Sensor Changed 2 Voltage Limit 512 Notin Tolerance 4 1024 Sensor Shorted 8 Temperature Limit 2048 N A 16 4096 N A 32 N A 8192 64 Sensor Open 16384 N A 128 Module Open Open Circuit 32768 N A Read this register using the TEC ENABle OUTOFF query The factory default value ofor this register is 1224 the conditions that will cause the output to shut off are Sen
61. nu displays tec temperature TEMP on line 1 and tec current ITE on line 2 Examples STATMENU LINE1 TEMP response tec temperature is displayed on line 1 of the status menu STATMENU LINEn ITE RON REMOTE The STATMENU LINEn ITE command sets the measurement that is to be displayed on line n of the status menu to tec current ITE por PO POD Parameters None Examples STATMENU LINE1 ITE response tec current is displayed on line 1 of the status menu 08_05 LDC 3916558 35 36 LDC 3916558 COMMAND REFERENCE LDC 3916558 Device Dependent Commands STATMENU LINEn RES REMOTE The STATMENU LINEn RES commands sets the measurement that is to be displayed on line n of the status menu to thermistor resistance RES e o Parameters None Examples STATMENU LINE1 RES response thermistor resistance is displayed on line 1 of the status menu STATMENU LINEn TEV REMOTE The STATMENU LINEn REV command sets the measurement that is to be displayed on line n of the status menu to tec forward voltage TEV vo Parameters None Examples STATMENU LINE1 TEV response tec forward voltage is displated on line 1 of the status menu TEC FRONT PANEL REMOTE The TEC command path is used to access the LDC 3916558 3 Amp Temperature Controller s TEC commands The following command paths may be reached from the TEC command path TEC CAL TEC LIMit T
62. on mode for TEC current 38 LDC 3916558 Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC CAL MEAS FRONT PANEL REMOTE The TEC CAL MEAS command is used to enter measured value during the selected module s TEC calibration procedure white nrf J space gt value gt Parameters nrf value that represents the measured value expected for the present calibration state Notes See the Service Reference portion of this manual for complete calibration instructions Examples TEC CAL MEAS 1 01 action the module uses the value 1 01 for the required measurement value TEC CAL SEN FRONT PANEL REMOTE The TEC CAL SEN command is used to initiate the calibration procedure for the selected module s TEC sensor thermistor white nrf space value Parameters nrf value representing the thermistor sense current value 1 100 uA 2 10 pA Notes This mode calibrates thermistor resistance measurements Both thermistor current settings must be calibrated separately After this command is issued the selected module will enter thermistor calibration mode See the Service Reference portion of this manual for complete calibration instructions Examples TEC CAL SEN 1 action the selected module enters calibration mode for 100 pA thermistor current calibration 08 05 LDC 3916558 m 39 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC CA
63. ovides a high temperature limit setting TLim When the load temperature exceeds the TLim setting the 3916558 will turn off the TEC current and generate an error The TLim setting is in the page 1 menu Using GPIB you can disable the high temperature limit from turning off the controller See Chapters 3 and 4 for more information about disabling or enabling conditions that will turn off the controller 08 05 LDC 3916558 7 15 OPERATIONS Default Settings Default Settings When you select Default from the Recall menu the 3916558 module will return to the following settings Table 2 2 3916558 Default Settings Output Off Mode Constant Temperature Temperature setpoint TSet 22 current setpoint ISet 1 0A Current limit ILim 1 0A Temperature limit TLim 80 0 Resistance setpoint RSet 10kQ Gain 3 Sensor Current 100 uA C1 1 125 x 103 2 2 347 x 10 C3 0 855 x107 TEC Error Indicators The 3916558 Controller indicates general TEC operational error conditions When an error occurs the Error Indicator Code will appear on the Status page the Chan page or the respective channel s setup pages The Error Indicator Code will clear when you exit any page where it appears Error Indicator codes are summarized in Table 2 3 Some of these errors can be disabled using GPIB See Chapter 4 for more information 16 LDC 3916558 Lightwave 08_05 Table 2
64. play TEC forward voltage TEC CAL ABORT none Aborts calibration TEC CAL DEFAULT none Stores default calibration values for selected calibration TEC CAL ITE none Selects ITE calibration TEC CAL MEAS 1 Enters an actual measured value during calibration TEC CAL SEN 1 Selects thermistor temperature sensor calibration TEC CAL STAT none Queries the status of calibration TEC CAL VALUE 1 Queries a calibration value for use at factory only TEC COND none Queries the value of the Condition Status Register TEC CONST 3 Enters the Steinhart Hart coefficients TEC CONST none Queries the values of the Steinhart Hart coefficients TEC CONV R 1 Converts a resistance kO to temperature 9C TEC CONV R 0 or 1 Returns the equivalent temperature 9C of the last conversion TEC CONV T 1 Converts a temperature 9C to resistance TEC CONV T 0 or 1 Returns the equivalent resistance of the last conversion TEC ENAB COND 1 Enters the value for the Condition Status Enable Register TEC ENAB COND none Queries the contents of the Condition Status Enable Register TEC ENAB EVE 1 Enters the value for the Event Status Enable Register TEC ENAB EVE none Queries the contents of the Event Status Enable Register TEC ENAB OUTOFF 1 Enters the value for the Output Off Enable Register TEC ENAB OUTOFF none Queries the contents of the Output Off Enable Register 30 LDC 3916558 Lightwave 08_05 COMMAND REFERENCE GPIB Comman
65. r shipping damage immediately Verify that the module has an ESD protective hood on the 15 pin D sub and that it is enclosed in an ESD safe handling bag Remember before handling the module to follow proper ESD safe handling procedures Installing the Module into the LDC 3916 or LDC 3908 Mainframe If you are receiving this new module without an LDC 3916 or LDC 3908 Mainframe for installation into a previously purchased mainframe follow the instructions below If your system was configured at the factory with your desired modules skip this section A CAUTION Static discharge can damage your new Temperature Controller Module Be certain you use proper grounding procedures before you unpack and install your module s into the LDC 3916 or LDC 3908 Mainframe Inspect the module for any visible shipping damage that may have occurred before inserting the module into the mainframe Pay special attention to the copper shielding material on the back edge of the module Be sure that the LDC 3916 or LDC 3908 Mainframe power is off before inserting or removing any module Unwrap the module from the anti static bag it was packaged in Make sure the instrument the module is going into either the LDC 3916 or the LDC 3908 is switched off Insert the module into the desired slot from the rear Each module is supported by two plastic card guides inside of the mainframe Insert the module 40 pin connector first by lining up the edges of the module fr
66. s TEC COND FRONT PANE REMOTE The TEC COND query returns the contents of the selected module s TEC Condition Status register 0 0 Parameters response is the sum of the following 1 Current Limit 256 2 Voltage Limit 512 In Tolerance 4 N A 1024 Output On 8 Temperature Limit 2048 16 N A 4096 N A 32 N A 8192 N A 64 Sensor Open 16384 N A 128 Open Circuit 32768 N A Notes The bits in this register reflect as closely as possible the actual state of the module They will change as conditions in the module change To be sure you detect the occurrence of a condition it may be appropriate to read the Event Status Register TEC EVE You can set up the module to automatically report selected conditions to the 3916 and the 3908 Status Byte Specify the conditions that are reported using the Condition Status Enable Register TEC ENABLE COND See the Status Reporting section of the 3916 or 3908 manual for more details Examples TEC COND response 1024 means that the TEC Output is on TEC COND response 1025 means that the TEC Output is on 1024 and the output is in current limit 1 08 05 LDC 3916558 m 41 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC CONST FRONT PANEL REMOTE The TEC CONST command sets the Steinhart Hart coefficients for the selected module s TEC thermistor white nrf nrf nrf z poo poo p Parameters Three nrf values
67. seconds Check to see if the internal cal procedure is ready for the third measurement Send the following query to the module TEC CAL STATUS The cal procedure is ready for a measurement if it returns the value 1 Query the status until the value that is returned is 1 k Enter the third actual measured TE current TEC CAL MEAS current in Amps e g TEC CAL MEAS 0 45 The controller will set the output current to approximately 90 of its positive output range Allow the current to settle for at least 10 seconds I Check to see if the internal cal procedure is ready for the fourth measurement Send the following query to the module TEC CAL STATUS The cal procedure is ready for a measurement if it returns the value 1 Query the status until the value that is returned is 1 m Enter the fourth actual measured TE current TEC CAL MEAS current in Amps e g TEC CAL MEAS 1 47 After you have entered the last measured current the internal calibration procedure will perform the calibration for the current setpoint measurement and limit circuits The cal procedure will set the status to the value 2 to indicate that it has finished 08 05 LDC 3916558 75 TROUBLESHOOTING Voltage Calibration TE Voltage Calibration The following procedure is for remotely calibrating the TE voltage measurement circuit The internal calibration procedure sets the current to two values You must measure the voltage at
68. setpoint TECSYNCI NONE Synchronized measurement returns the TE current in amps TECSYNCR NONE Synchronized measurement returns the thermistor resistance in TECSYNCT NONE Synchronized measurement returns the thermistor temperature in C TECSYNCV NONE Synchronized measurement returns the measured TE voltage in volts TEC T 1 Enters the constant temperature setpoint TEC T none Queries the measured temperature TEC TOL 2 Enters the tolerance parameters LDC 3916558 m 31 COMMAND REFERENCE GPIB Commands 32 LDC 3916558 Name Parameters Function TEC TOL none Queries the tolerance parameters TEC V none Queries the measured TE voltage MODERR none Returns the error codes up to 10 from the module MODIDN none Returns identification data from the module MODPUD 1 Used at factory to set product information MODPUD none Returns factory set product information Lightwave 08_05 COMMAND REFERENCE LDC 3916558 Device Dependent Commands LDC 3916558 Device Dependent Commands This section contains all of the device dependent commands for the LDC 3916558 3 Amp Temperature Control Modules listed in alphabetical order Sub sections for each path are presented listing the commands that are legal for that path See Chapter 3 Figure 3 1 for the command path tree structure Figure 4 1 shows the format for the commands Command Path Name Required letters are show
69. shooting Calibration 68 Recommended Equipment 68 Local Calibration of the 3916558 3 Amp Temperature Controllers 69 Thermistor Calibration 69 ITE Current Calibration 70 TE Voltage Calibration 71 Remote Calibration of the 3916558 3 Amp Temperature Controllers 72 Thermistor Calibration 72 ITE Current Calibration 74 TE Voltage Calibration 76 Troubleshooting Guide 77 ii LDC 3916558 Lightwave Lightwave Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 7 Figure 2 8 Figure 3 1 Figure 3 2 Figure 3 3 Figure 4 1 LIST OF FIGURES El El El El El a E El E a a a Rear Panel TEC 6 3916 Front Panel sarerea cese s ree nt Rx ec eee aT a RR 7 Channel Menu 8 piti Menu ze rayon e e erdt se eae 9 TEC p Menu ne ad cee ee P rex as ta e E Ladder ad 9 MENU i ca d RU an a HO EG 10 p4
70. sor Shorted Module Open Sensor Open and Temperature Limit 1024 128 64 8 If you set bit 9 in this register the output will shut off whenever the controlled temperature is out of tolerance specified using the TOL command If the tolerance conditions do not include the ambient temperature 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 TEC ENAB OUTOFF 72 action sets the selected module s TEC Output Off enable register so that either a Sensor Open 64 or Temperature Limit 8 condition will cause the TEC output to be turned off LDC 3916558 m 49 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC ENABle OUTOFF FRONT PANEL REMOTE The TEC ENABle OUTOFF query returns the contents of the selected module s TEC OUtput Off Enable register e gt Parameters response is the sum of the following 1 Current Limit 256 Sensor Changed 2 Voltage Limit 512 Notin Tolerance 4 1024 Sensor Shorted 8 Temperature Limit 2048 N A 16 4096 N A 32 N A 8192 64 Sensor Open 16384 N A 128 Module Open Open Circuit 32768 N A Notes This register can be set by using the TEC ENABle OUTOFF command Examples TEC ENAB OUTOFF response 8 means that the selected module s TEC Temperature Limit is the only condition that will cause the TEC output to be turned off 50 1003916558
71. surement system is connected to the thermistor resistance measure signal when this query is received A resistance measurement is made and the result is returned as the response After the measurement is made the measurement system returns to its normal function switching between the various signals and measuring them The response time to this query is from 200 to 250 msec but the measurement is made as soon as the query is received In contrast the TEC R query returns immediately but the measurement can be up to 600 msec old Examples TEC SYNCR response 10 543 means the measured thermistor resistance is 10 543 62 m LDC 3916558 Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC SYNCT REMOTE The TEC SYNCT query returns the selected channel s measured thermistor temperature in 9C Parameters None The response value is an nrf value representing temperature in oC Notes Temperature is derived from the thermistor resistance measurement This is a synchronized measurement the TEC measurement system is connected to the thermistor resistance measure signal when this query is received A resistance measurement is made the temperature is calculated and the result is returned as the response After the measurement is made the measurement system returns to its normal function switching between the various signals and measuring them The response time to this query is from 200
72. t point value The output should always be off when connecting or disconnecting cables to the output connector Examples TEC OUT response 0 means that the selected module s TEC is off TEC OUT response 1 means that the selected modules TEC is turned on TEC R FRONT PANEL REMOTE The TEC R command sets the selected module s TEC constant resistance setpoint lt white nrf Lj space value Parameters None The response is an nrf value representing the measured thermistor resistance in kO Notes This setting is always stored when the command is valid but it is only used when the TEC is in constant resistance mode This setting is read using the TEC SET R query Examples TEC R 15 action sets the selected module s TEC constant resistance setpoint to 15 ka 58 LDC 3916558 Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC R FRONT PANEL REMOTE The TEC R query returns the value of the selected module s TEC measured thermistor resistance Oeo ro Parameters None The response is an nrf value representing the measured thermistor resistance in kO Notes Response is the selected module s measured thermistor resistance regardless of control mode This measurement is updated approximately once every 600 msec Examples TEC R response 16 7 means the selected module s measured TEC thermistor resistance is 16 7 TEC SENsor FRON
73. t turn off any laser current sources Lightwave OPERATIONS Operating the Temperature Controllers from the Front Panel Note The only channel numbers that will appear are channels in which a controllable laser source resides Next highlight the Output parameter and turn the knob or press the INC hardkey to select laser source output 1 or 2 refer to Table 2 1 Both to choose both outputs or None so that the TEC will not turn off either laser current source output In modules with 2 laser sources output 1 is the top source and output 2 is the bottom source Table 2 1 TEC Controllable Laser Sources 3916 Module Firmware Version Number of Laser Source Outputs 3916371 v2 03 or greater 1 3916372 v2 03 or greater 1 3916374 v2 03 or greater 1 3916376 v2 03 or greater 1 3916332 v1 03 or greater 2 3916334 v1 03 or greater 2 3916336 v1 03 or greater 2 3916338 v1 06 or greater 1 You are now finished setting up the TEC to control temperature to 15 5 C Connect the load and turn on the temperature controller From any of the three TEC pages p1 p2 p3 or p4 you can turn on the output by pressing the F1 softkey associated with the OFF box in each page Notice that the text inside the box changes to ON The text box reports the controller s on off status Note To check the firmware version in any module select the correct channel number in the CHAN menu then press the followin
74. tains useful information for remote operation of the module STATMENU LINEn REMOTE The STATMENU LINEn command path is used to get to the selected channel s status menu display selection commands n can be either 1 or 2 The following commands may be reached directly from the STATMENU LINEn command path STATMENU LINEn TEMP STATMENU LINEn ITE STATMENU LINEn RES STATMENU LINEn TEV STATMENU LINEn REMOTE The STATMENU LINEn query returns the name of the measurement that is currently being displayed on line n of the status menu can be either 1 or 2 Parameters None The response is character data which represents the measurement that is currently being displayed on line 1 of the selected channel s portion of the status menu Notes The possible responses are 1 TEMP tec temperature 2 ITE tec current 3 RES thermistor resistance 4 TEV tec forward voltage The default condition of the status menu displays tec temperature TEMP on line 1 and tec current ITE on line 2 Examples STATMENU LINE1 response displays the last used command on line 1 34 LDC 3916558 Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands STATMENU LINEn TEMP N REMOTE The STATMENU LINEn TEMP command sets the measurement that is to be displayed on line n of the status menu to tec temperature TEMP 2996 Parameters None Notes The default condition of the status me
75. tely 9096 of its negative full range Allow the current to settle for at least 10 seconds Check to see if the internal cal procedure is ready for a measurement by sending the following query to the module TEC CAL STATUS The cal procedure is ready for a measurement if it returns the value 1 Query the status until the value that is returned is 1 Enter the measured current in Amps by sending the following command TEC CAL MEAS current in Amps e g TEC CAL MEAS 1 45 The internal cal procedure will store the measured value that you enter and briefly change its measurement status to O to indicate that it is not yet ready for another measurement This will occur after each time a new measurement is entered The controller will set the output current to approximately 3096 of its negative output range Allow the current to settle for at least 10 seconds Lightwave TROUBLESHOOTING ITE Current Calibration g Check to see if the internal cal procedure is ready for the second measurement Send the following query to the module TEC CAL STATUS The cal procedure is ready for a measurement if it returns the value 1 Query the status until the value that is returned is 1 h Enter the second actual measured TE current TEC CAL MEAS current in Amps e g TEC CAL MEAS 0 43 i The controller will set the output current to approximately 30 of its positive output range Allow the current to settle for at least 10
76. the channel number and output of the laser to turn off TEC LASOFF response 1 2 the is configure to turn off channel 1 source 2 TEC LASOFF response 17 3 the TEC is configured to turn off all channels and all outputs TEC LIMit FRONT PANEL REMOTE The TEC LIMit command path is used to access the selected module s TEC limit commands The following commands may be reached directly from the TEC LIMit command path TEC LIMIt ITE TEC LIMIt ITE TEC LIMit THI TEC LIMit THI LDC 3916558 m 53 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC LIMit ITE FRONT PANEL REMOTE The TEC LIMit ITE command sets the selected module s TEC current limit value nrf Parameters nrf value that represents the selected module s TEC limit current in Amps Notes The current limit parameter must be a positive value It is applied to both positive and negative current drives Examples TEC LIM I 0 8 action the selected module s TEC current limit is set to 0 8 TEC LIMit ITE FRONT PANEL REMOTE The TEC LIMit ITE query returns the value of the selected module s TEC current limit setting vor Coo Po Parameters None The response is an nrf values Notes The current limit is in effect in all control modes Examples TEC LIM I response 0 9 means the selected module s TEC current limit is 0 9 A TEC LIMIT THI FRONT PANEL REMOTE The TEC LIMit THI com
77. the value of a parameter using the numeric keypad along with the ENTER key the ADJUST knob or the INC 1 and DEC 4 keys in the lower left corner of the ADJUST section A A nm Example Setup The 3916558 temperature controller has four pages menus of information Suppose you need to maintain the temperature of a laser package at 15 5 Your laser is in a package that comes equipped with an internal TEC module and a thermistor To set up the temperature controller Select constant temperature control mode Enter the temperature setpoint of 15 5 C Select the sensor current range Enter the appropriate thermistor constants Set the control loop gain Set appropriate high temperature limit and TEC module current limits To access any of the TEC information pages you must start with the Channel menu The most direct way is to press the CHAN key located directly below the MAIN key in the upper right corner of the DISPLAY area The Channel menu allows you to change channels modules by rotating the ADJUST knob turn the temperature controllers on or off and access each of the TEC s menus To get to the TEC s first menu press the F2 softkey it is attached to the TEC box in the Channel menu The next menu is the TEC page 1 menu Figure 2 3 Channel Menu 8 m LDC 3916558 Lightwave OPERATIONS Operating the Temperature Controllers from the Front Panel In the TEC page 1 menu you can s
78. this manual Within the command set however are a few commands that have been found to be frequently used These commands are listed in Table 3 1 Table 3 1 LDC 3916558 Often Used Commands Name Parameters Function Example CHAN 1 Sets the channel number for further chan 1 commands ERR none Returns Mainframe errors err generated since the last query followed by a binary indication of modules with errors MODERR none Returns module errors generated moderr since the last error query to that module TEC TEC MODE T none Selects the constant temperature tec mode t control mode TEC T 1 Sets the constant temperature mode tec t 25 6 setpoint TEC LIM THI 1 Sets the high temperature limit tec lim thi 100 0 TEC LIM ITE 1 Sets the current limit tec lim ite 1 1 TEC SEN 1 Sets the thermistor current 10 LA or tec sen 1 100 LA TEC GAIN 1 Sets the control loop gain tec gain 40 TEC OUT 1 Turns the temperature controller on tec out on off TEC T none Returns the measured temperature tec t Table 3 1 illustrates the minimum set of settings that must be entered for proper operation of a temperature controller in the LDC 3916558 control mode setpoint high temperature limit current limit sensor type and control loop gain Command Timing and Completion All commands for the LDC 3916558 module are sequential The Tolerance feature can be used to notify a
79. to 250 msec but the measurement is made as soon as the query is received In contrast the TEC T query returns immediately but the measurement can be up to 600 msec old Examples TEC SYNCT response 17 9 means the measured thermistor temperature is 17 9 9C TEC SYNCV REMOTE The TEC SYNCV query returns the selected channel s measured TE forward voltage in Volts LOI Parameters This is a synchronized measurement the TEC measurement system is connected to the voltage measure signal when this query is received A voltage measurement is made and the result is returned as the response After the measurement is made the measurement system returns to its normal function switching between the various signals and measuring them The response time to this query is from 200 to 250 msec but the measurement is made as soon as the query is received In contrast the TEC V query returns immediately but the measurement can be up to 600 msec old Examples TEC SYNCV response 1 9 means the measured forward voltage is 1 9V 08 05 LDC 3916558 m 63 64 LDC 3916558 COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC T FRONT PANEL REMOTE The TEC T command sets the selected module s TEC constant temperature setpoint white nrf space gt value gt Parameters nrf value representing the constant temperature setting in 9C Notes This setting is always stored when the command is val
80. ts of the Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands tolerance window are In constant resistance mode the window units are In constant current mode the window is in Amps The default tolerance parameters are 0 2 and 5 This corresponds to 0 2 C or 0 2 or 0 2 A for five seconds WARNING If the tolerance window is set too tight for the system the output may never reach tolerance Examples TEC TOL 0 5 10 action sets the selected module s TEC tolerance window to 0 5 for 10 seconds TEC TOL FRONT PANE REMOTE The TEC TOL query returns the values of the selected module s TEC tolerance window Parameters None The response is two nrf values representing the tolerance parameters as described in the TEC TOL command description Notes Measurements are updated approximately every 600 msec This means that the smallest effective tolerance duration is 0 6 seconds Examples TEC TOL response 1 10 means the selected module s TEC tolerance parameters are 1 and 10 If the control mode is constant temperature this means the tolerance units are 19C and 10 seconds TEC V FRONT PANEL REMOTE The TEC V query returns the selected module s TEC measured TE voltage Parameters None The response is an nrf value representing the measured TE voltage in Volts Notes This measurement is updated approximately once every 600 msec Examples TEC V response 3 4 means t
81. ud but it is only used when the TEC is in constant temperature mode This setting is read using the TEC SET T query Examples TEC T 12 action sets the selected module s TEC temperature setpoint to 129C TEC T FRONT PANEL REMOTE The TEC T query returns the value of the selected module s TEC measured temperature Parameters None The response is nrf value representing the measured temperature in Notes The measured temperature is calculated from the measured thermistor resistance using the Steinhart Hart equation and the Steinhart Hart coefficients entered using the TEC CONST command This measurement is updated approximately once every 600 msec Examples TEC T response 13 1 means the selected module s measured TEC temperature is 13 1 C TEC TOLerance REMOTE The TEC TOLerance command sets the selected module s TEC tolerance settings white nrf nrf space value value Parameters Notes Two nrf values The first represents the tolerance window the second represents the required time duration When the controlled quantity temperature resistance or current is within the tolerance window for the required time duration the load is said to be In Tolerance A bit in the Condition Status Register is set whenever this condition exists The range of the first parameter the tolerance window is 0 1 to 10 0 The units of this parameter depends on the control mode In constant temperature mode the uni
82. um User s Guide Current Source TE Module LDC 3916558 db LX Lic nives A Newport Corporation Brand ILX Lightwave Corporation 31950 Frontage Road Bozeman MT U S A 59715 U S amp Canada 1 800 459 9459 International Inquiries 406 556 2481 Fax 406 586 9405 ilx custhelp com www ilxlightwave com 70033202 June 2005 TABLE OF CONTENTS El EI Bl El Bl A El El H El E E El a a Table of Contents i Safety and Warranty Information Safety Information and the General Safety 5 5 Safety Symbols 52cm gr Rum CRGA duke Re Nn vi Safety Marking Symbols vi Warranty vii Comments Suggestions and Problems ix Chapter 1 Introduction and Specifications Product Overview 1 Initial Inspection 2 Installing the Module into the LDC 3916 or LDC 3908 Mainframe 2 Specifications skurdkuasdafasdde WO a C ae ROS UR aon A 3 Chapter 2 Operations Connecting to the Temperature Controller 5 TEC Grounding Considerations 6 Oper
83. version LDC 3916558 Parameters Either no parameters or an nrf value that corresponds to a temperature in Notes The calibration constants C1 C2 and C3 are used to convert temperature to resistance Examples TEC CONV T returns a number that corresponds to the resistance value of the most recent conversion TEC CONV T 35 5 converts 35 5 to resistance and returns a number that corresponds to resistance in kO TEC ENABle FRONT PANE REMOTE The TEC ENABle command path us used to access the selected module s TEC status enable commands and queries The following commands may be reached directly from the TEC ENABle command path TEC ENABIe COND TEC ENABIe COND TEC ENABle EVEnt TEC ENABle EVEnt TEC ENABle OUTOFF TEC ENABle OUTOFF Lightwave COMMAND REFERENCE LDC 3916558 Device Dependent Commands TEC ENAB le COND FRONT PANEL REMOTE The TEC ENABle COND command sets the selected module s TEC Condition Status Enable register The bits in this register determine the bits in the TEC Condition Status register that are summarized in the 3916 Status Byte Parameters nrf value whose sum represents the enabled bits white nrf space value 1 Current Limit 256 N A 2 Voltage Limit 512 In Tolerance 4 N A 1024 Output On 8 Temperature Limit 2048 16 N A 4096 N A 32 N A 8192 64 Sensor Open 16384 N A 128 Open Circuit 32768 N A Notes This

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