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User`s Guide - Newport Corporation

1. MEAS PID COND ITE P EVE SEN P THERM SLOP SLOP A C1 EVE HI HI HI T il HK C c3 OUTOFF LO LO LO D RO LO LO LO D ATUNE ATUNE PRESET PRESET Figure 3 3 Command Path Structure 32 LDT 5910C and LDT 5940C Syntax Summary GPIB commands must contain all of the letters shown in uppercase in the command definition Optional letters shown in lowercase for some device dependent commands in the command reference Chapter 4 are useful for clarity but must be in the correct sequence A single white space must separate a command from its parameters or data White space is normally the space character space bar Other control characters are also interpreted as white space Do not use white space before the question mark in a query command If problems are encountered with communications the terminator string may be the cause Refer to the GPIB interface controller manual for additional information The instrument accepts lt NL gt or lt AEND gt or lt NL gt lt END gt as a command line terminator Many computers terminate with lt CR gt lt NL gt lt END gt Carriage Return New Line EOI The instrument ignores lt CR gt Carriage Return as white space The LDT 5910C and LDT 5940C terminates its responses with lt CR gt lt NL gt lt END gt More than one command may be on the same line Same command string if the commands are separated with semicolons GPIB
2. cccccessscceeceeeesseeeeceeeeseeeeeneesseesensenaseees 9 Grounding Requirements 2 cceeeseeceeeesecceeeeeeeceeeeeenceeneneeceenenenenenenencees 9 AC Line Power Requirements sc s c20 0 neeieiel cee I ee 9 The Power Up SCQUCNCC EE 9 Firmware Upgradeability eerren ote cree eats Sak ee ts Sah ea ts Sah eats eek aee ate 10 GPIB EE eg 10 USS COmmMunMiGanon EE 10 Tilt FoGtAdjustment E 10 Rack Oe in ue EE 10 CS UII ENON Sst st Saar dad oi hata aad ak a ak ck Ed a Ih al can Enel OS dnd a Dies ea 11 Front Panel Operation sec cassccs EEN 13 Power On EI est deeg EMA de teen ae ie ee at 13 Adjust Knob and Enable Button rrea A EATER 13 February 2012 i LDT 5910C and LDT 5940C PID CONTON EEN 15 Klee 16 MiS E a E ee ec a ee elds ce ee a a ee ee 16 Error IMGIGAtOnS ege ees E Eed de ade ete eae eds ea eee ads a ade Sete het 17 General ele Egeter Le 17 Warm Up and Environmental Considerations sssseseteneseeerttt re tsttttttr ntr nstrrtttnn tennene te nnne nnne nnt 17 General Guidelines for Sensor Selection and Safety Limits 0 ee ceeeeeeeeneeeeeeeneeeeeeneeeeeeeaas 17 SENSOF EES EE EE 17 Safety LIMS ereta earet EENSEEEEe nee aed nee ENEE AEAEE ERAEN EENAA EAn 22 Constant Temperature Mode Operation 22 Constant Sensor Mode Dette ees eCENENNen 22 Constant Current Mode Operation 24 Resistive Heater Mode Operaton AA 24 Chapter 3 Remote Operation 25 EIS Ee e 25 lee ele 25 Data a
3. Temperature Stability 1 hour 24 hours 1 hour 24 hours SENSOR Types Thermistor 5910C Thermistor 5940C IC V Semiconductor IC IC I Semiconductor IC 0 001 C 0 01 C 0 002 C 0 04 C 0 007 C 0 15 C 0 05 C 0 9 C 0 001 C LDT 5910C 0 002 C LDT 5910C 0 002 C LDT 5940C 0 003 C LDT 5940C NTC 2 wire NTC 2 or 4 wire LM 335 Voltage output 5 to 14 mV K AD 590 Current output 1 A K RTD Sensor 5910C Platinum 100 9 1000 Q 2 wire RTD Sensor 5940C Platinum 100 9 1000 Q 2 or 4 wire Thermistor Sensor Resistance 10 uA Bias Setting Range 0 to 450 kQ Resolution Display 0 01 kQ Accuracy 180 Q 100 1A Bias Setting Range 0 to 45 kQ Resolution Display 0 001 kO Accuracy 18 Q Linearized Thermistor Resistance Range 0 to 15 kQ Resolution Display 0 001 KQ Accuracy 10 Q IC V Sensor Voltage Nominal Bias 1mA Range 0to6V Resolution Display 0 0001 V Accuracy 2 mV IC I Sensor Current Nominal Bias 5to 15V Range 0 to 600 uA Resolution Display 0 001 uA Accuracy 0 18 uA RTD Sensor Resistance 1 mA Bias Setting Range 0 to 1500 Q Resolution Display 0 010 Accuracy 40 80 2 5 mA Bias Setting Range 0 to 200 Q Resolution Display 0 001 Q Accuracy 0 19 User Sensor Calibration Thermistor IC Sensors RTD AUXILIARY LO Analog Control Input Input Voltage Range Input Resistance Gain Bandwidth Interlock Ext
4. Adjust the setpoint by enabling the ADJUST knob and enable the output The user can display measured voltage sensor value or temperature or the current setpoint in either the left or right side of the display by pressing the LEFT and RIGHT display buttons Resistive Heater Mode Operation 1 Plug the LDT 5910C or LDT 5940C into an AC power source supplying the correct mains voltage and frequency for your instrument refer to the rear panel for the correct ratings Turn on the LDT 5910C or LDT 5940C The output will be disabled at power up and the unit will automatically configure its parameters to the state which existed when the power was last shut off Press MODE until TEMP LED or SNSR LED is selected Press PARAM then select LIMITS and adjust l to maximum current limit for your resistive heater then select I and set to 0 amps by setting the limit to zero when the LDT 5910C or LDT 5940C attempts to cool the load the output will be limited to 0 amps Press PARAM to adjust the applicable limits sensor type calibration constants GPIB address display brightness and external fan control Adjust the setpoint by enabling the ADJUST knob and enable the output The user can display measured voltage or current and depending upon the mode constant TEMP or SNSR can display either the measured temperature constant SENSR or sensor constant TEMP or the setpoint temperature constant TEMP or sensor constant SENSR in either the left or r
5. Chapter 4 Command Reference This chapter is a guide to all of the device dependent commands for the LDT 5910C and LDT 5940C Precision Thermoelectric Temperature Controllers This chapter is divided into three parts vi Overview of the remote commands vi List of remote commands in alphabetical order 5910B Compatible Commands Remote Command Reference Summary This section contains all of the commands for the LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers listed in alphabetical order Table 4 1 contains a list and a description of each IEEE 488 1 common command Table 4 2 contains the instrument specific commands Unless otherwise noted each of the instrument specific commands has a corresponding query without a parameter See Figure 3 3 for the command path tree structure Table 4 1 Remote Command Summary of IEEE 488 1 Common Commands COMMAND SYNTAX FUNCTION CLS Resets the Standard Event Register Status Byte and Error Queue to zero ESE lt integer gt Sets the Standard Event Status Enable Register ESE Returns the value of the Standard Event Status Enable Register ESR Returns the value of the Standard Event Status Register IDN Returns the Device Identification string Panic Generates the Operation Complete message in the Standard Event Status Register OPC Places an ASCII character 1 into the Output Queue PSC Used to avoid any undesirable ser
6. Slave devices in turn using the reserved address 0 assigning each one a unique address and finding out from each device what its speed is and what type of data transfer it wishes to perform The enumeration process also takes place whenever a device is plugged into an active network The connectors design along with the process of enumeration and a lot of host software allows devices to be described as Plug and Play When the USB device is enumerated and gets an address from the host it presents the host with information about itself in the form of a series of descriptors The device descriptor tells the host the vendor and the product ID The configuration descriptors offer a power consumption value and a number of interface descriptors Each of these interface descriptors define a number of endpoints which are the sources and destinations for data transfers The endpoint descriptors provide the following detail transfer type bulk interrupt isochronous direction packet sizes bandwidth requirement and repeat interval In USB communication a typical transaction consists of a number of packets a token indicating the type of data that the host is sending or requiring the data and in some cases an acknowledgement Each packet is preceded by a sync field and followed by an end of packet marker These transactions are used to provide four basic data transfer mechanisms including control interrupt bulk and isochronous types USBTMC stand
7. This GPIB address is read locally by pressing the PARAM button until the GPIB Address is displayed on the dot matrix display The driver comes from the factory configured with the GPIB address set to 1 You can change the LDT 5910C s and LDT 5940C s GPIB address locally via the front panel A procedure for changing the address can be found in the section changing the GPIB Address Basic GPIB Concepts The information in this section is normally not necessary to successfully operate the LDT 5910C and LDT 5940C through its GPIB interface because the host computer s GPIB controller usually handles the details However it is a useful introduction to understanding GPIB Data and Interface Messages GPIB devices communicate with each other by sending data and interface messages Data contains device specific information such as programming instructions measurement results and instrument status Each device has an address number and ignores all data traffic no addressed to it Depending on its content data is often called a device dependent message or a device dependent command Interface messages manage the bus with functions such as initializing the bus and April 2012 25 LDT 5910C and LDT 5940C addressing or un addressing devices In addition some individual bus lines are designated for this purpose Talkers Listeners and Controllers Every GPIB system consists of one or more talkers and listeners and often at
8. This may also occur if the instrument is in thermal run away where the LDT 5910C or LDT 5940C has reached the current limit but the sensor value continues to rise To correct thermal run away conditions additional heat sinking may be required The instrument reads Error Cal Therm The LDT 5910C and LDT 5940C cannot be calibrated in Auto Therm Auto mode To calibrate Therm Auto the user must calibrate the 10 uA and 100 pA thermistor currents The instrument reads TEC Open Check the cable connections to the TEC and also verify the TEC module is not showing an open circuit by measuring the resistance of the TEC if the problem persists contact customer support at ILX Lightwave The instrument reads Sensor Open Check the cable connections to the sensor Under the April 2012 66 LDT 5910C and LDT 5940C Kl PARAM menu confirm the appropriate Sensor has been selected If the problem persists contact customer support Power on but temperature is not If there is a SENSOR OPEN indication Error code 505 controlled or is unstable check the sensor connections pins 14 15 Check that the proper sensor current range is selected Check that the appropriate coefficients have been set for your sensor Refer to Sensor Options in Chapter 2 Check that the P and D constants are optimized for your thermal load and that the current limit value is not too low If the problem persists contact customer support a
9. Wait three seconds for the output to settle at 3 A Calculate the actual current output by using Ohm s Law 1 V R Where V is the accurately measured voltage across the resistor and R is the accurately measured load resistance A 4 point probe resistance measurement is recommended April 2012 74 LDT 5910C and LDT 5940C 3 Press and hold in the parameter SET button and turn the ADJUST knob until the display shows the absolute value of the ITE measurement as calculated from step 2 4 Release the SET button Wait three seconds to allow the ITE current to settle at 3 Amps 5 Repeat step 3 for the new setpoint 6 Wait for the 7 segment display to exit the calibration mode Once the self calibration is completed the calibration constants will be stored to the non volatile memory and the display will return to its previous state April 2012 15 LDT 5910C and LDT 5940C TEC Voltage Measurement Calibration The foll 1 2 3 10 11 April 2012 owing procedure calibrates the TEC voltage measurement Calibrate the ITE current as described in the section above Measure the exact resistance of a 5 Q 25 W resistor With the output off connect the resistor across the TEC output terminals of the LDT 5910C pins 1 and 3 of the 15 pin connector or the LDT 5940C pins 9 10 21 22 and 12 13 24 25 of the 25 pin connector Connect a calibrated DMM across the load resistor Enter the calibration mode by pushing the RECALL
10. 0 ANAloginput Description Enables the analog input rear panel BNC to be used for temperature modulation Parameters ON 1 Temperature Modulation ON OFF 0 Temperature Modulation OFF Reset Value OFF CABLER lt ohms gt CABLER Description Output cable resistance used to improve the accuracy of the MEASure VTE command Parameters ohms Cable resistance Notes Voltage measurement subtracts this resistance multiplied by output current to get actual voltage Reset Value 0 02 CONST ICI lt slope gt lt offset gt CONST 1ICI Description Slope and offset compensation for a temperature to current transducer Parameters slope 0 to 9 999 representing the A K response of the temperature to current transducer offset 9 999 to 9 999 representing the sensor offset in pA Reset Value 1 0 CONST ICI SLOPe lt pA K gt CONST ICI SLOPe Description Slope compensation for a temperature to current transducer Parameter 0 to 9 999 representing the A K response of the temperature to current transducer Reset Value 1 CONST ICI OFFSet lt uA gt CONST ICI Description Offset compensation for a temperature to current transducer Parameters 9 999 to 9 999 representing the sensor offset in UA Reset Value 0 April 2012 52 LDT 5910C and LDT 5940C CONST ICV lt slope gt lt offset gt CONST ICV Description Slope and offset compensation for a temperature to voltage transducer Parameters slope 0 to
11. 0 and slope should be set to a nominal value of 1 when the selected sensor is an IC I or set to a nominal value of 10 when the selected sensor is an IC V In order to calibrate an IC sensor device the sensor must be operated at an accurately known stable temperature For example the sensor may be calibrated at 0 C if the sensor is placed in ice water until its temperature is stable A highly accurate temperature probe thermometer environmental chamber etc may also be used to determine the known temperature for calibration This appendix contains one and two point calibration methods for IC sensor devices These methods will work for either type of device AD590 Sensor The AD590 is a linear IC thermal sensor which acts as a constant current regulator It produces a current which is directly proportional to absolute temperature over its useful range 50 C to 150 C This nominal value can be expressed as 1 1yA K Where is the nominal current produced by the AD590 and K is the temperature in Kelvin The LDT 5910C and LDT 5940C Temperature Controllers use i to determine the nominal temperature T_ by the formula T I 1 pA K 273 15 Where T is in C The temperature T which is displayed by the LDT 5910C and LDT 5940C is first calibrated as follows T C14 C2 T Where offset and slope are the constants stored by the user in the LDT 5910C and LDT 5940C for the AD590 The AD590 measurement is calibrat
12. 1 O Doing so may result in damage to the instrument Analog Control Input An isolated BNC connector is located on the rear panel of the LDT 5910C and LDT 5940C provides the capability to adjust the temperature setpoint by applying a voltage signal The LDT 5910C and LDT 5940C can accept a signal from 5 V to 5 V with a gain of 2 C V and bandwidth of 5 Hz This feature is useful in applications requiring sweeping of the temperature without using GPIB or USB remote interface April 2012 11 LDT 5910C and LDT 5940C Interlocks The LDT 5910C and LDT 5940C have normally open and normally closed interlock contacts The interlock will change states from the powered off condition when the output is enabled and will change back when the output is disabled including any error condition that disables the output External Fan Control The LDT 5910C and LDT 5940C feature the ability to control an external fan through either the 15 pin DSUB connector 5910C or the 25 pin DSUB connector 5940C This circuit can provide up to 500 mA and may be controlled from 1 to 12 Vdc The circuit will automatically increase the voltage to 12 Vdc start a fan from a stopped condition and will regulate to the desired voltage once more than 20 mA is drawn Pseudo 4 Wire Measurements The LDT 5940C offers a pseudo 4 wire measurement feature which helps to minimize errors induced by cable resistance both in thermistor RTD sensor modes as well as on the output termina
13. 7 0 C 5 0 Ro 100 1 CONST RTD response 3 4 7 0 5 0 100 1 The RTD coefficients are A 3 4 B 7 0 C 5 0 and RO 100 1 April 2012 53 LDT 5910C and LDT 5940C CONST THERMistor lt C1 gt lt C2 gt lt C3 gt CONST THERMistor Description Parameters Notes Reset Value Examples Steinhart Hart parameters for a thermistor temperature transducer C1 9 9999 to 9 9999 representing the first parameter of the Steinhart Hart equation multiplied by 10 C2 9 9999 to 9 9999 representing the second parameter of the Steinhart Hart equation multiplied by 107 C3 9 9999 to 9 9999 representing the third parameter of the Steinhart Hart equation multiplied by 107 The Callendar Van Dusen equation C1 C2 n R C3 In R Where R is the resistance at temperature T 1 125 2 347 0 855 CONST THERMistor 1 25 2 36 0 76 action Sets the Steinhart Hart coefficients to C1 1 25 C2 2 36 and C3 0 76 CONST THERMistor Response 1 25 2 36 0 76 C1 1 25 C2 2 36 and C3 0 76 DISPLay ON OFF 1 0 Description Parameters Notes Examples Display on off O OFF Display off 1 ON Display on LED is not turned off when display is off DISPLAY Response 0 means the display is currently shut off Disp Response 1 means the display is in normal state DISPLay BRIGHTness lt 1 10 gt Description Parameter Notes Examples April 2012 Adjusts the brightness on the VFD Display Integ
14. 99 99 representing the mV K response of the temperature to current transducer offset 99 99 to 99 99 representing the sensor offset in mV Reset Value 10 0 CONST ICV SLOPe lt mV K gt CONST ICV SLOPe Description Slope compensation for a temperature to voltage transducer Parameter 0 to 99 99 representing the mV K response of the temperature to current transducer Reset Value 10 CONST ICV OFFSet lt mV gt CONST ICV OFFSet Description Offset compensation for a temperature to voltage transducer Parameter 99 99 to 99 99 representing the sensor offset in mV Reset Value 0 CONST RTD lt A gt lt B gt lt C gt lt RO gt CONST RTD Description Callendar Van Dusen coefficients for RTD temperature transducer Parameters A 9 999 to 9 999 representing the first coefficient of the Callendar Van Dusen equation multiplied by 10 C B 9 999 to 9 999 representing the second coefficient of the Callendar Van Dusen equation multiplied by 107 C C 9 999 to 9 999 representing the third coefficient of the Callendar Van Dusen equation multiplied by 104 C RO The resistance of the transducer at 0 C adjustable from 0 to 9999 9 Ohm Notes The Callendar Van Dusen equation Rr Ro 1 AT BT CT3 T 100 T lt 0 C Rr Ro 1 AT BT T 20 C Where R is the resistance at temperature T Reset Value 3 908 5 775 4 183 100 Examples CONST RTD 3 4 7 0 5 0 100 1 action sets the RTD coefficients as follows A 3 4 B
15. A 06 Sensor Open 07 TEC Open 08 N A 09 Out of Tolerance 10 Output On 11 CAL Ready 12 N A 13 N A 14 NIA 15 N A Device Event Status Enable Register ENABle EVEnt lt nrf gt ENABle EVEnt Notes Enabled disabled events can be read by ENABle EVEnt Event status may be monitored by EVEnt Bit 2 of the status byte register is set if any device enabled events are true for generation of service requests April 2012 55 LDT 5910C and LDT 5940C Examples See Chapter 3 for more information about register structure Enable registers normally retain their values through power OFF ON unless the power on status clear flag is set true See PSC ENAB EVE 64 Enables Sensor Open event to be summarized in the status byte bit 2 Enable event H40 Same as ENAB EVE 64 except using hexadecimal numbering See RADix ENABle OUTOFF lt integer gt ENABle OUTOFF Description Enables bits in the device output off enable register Parameters 0 to 65535 TEC Output Off Register isfiafisfi2fsifiol 9 7 6 5 4 3 2 1 Jo 00 Over Current Limit 01 N A 3 02 Over Low T or R Limit S 03 Over High T or R Limit a J 04 N A 05 N A S 06 Sensor Open Logical 07 TEC Open OR R MoO 08 N A Sie CG 09 N A 10 N A z se vd A 11 HA Sege 12 N A S7 ER KC lel fs E Bad CSS 13 N A 14 N A cbabalchhatstsl leisst 5 4 TEC Output Off Enable Register ENABle OUT O
16. Corporation warrants this instrument to be free from defects in material and workmanship for a period of one year from date of shipment During the warranty period ILX will repair or replace the unit at our option without charge Limitations This warranty does not apply to fuses lamps defects caused by abuse modifications or to use of the product for which it was not intended This warranty is in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for any particular purpose ILX Lightwave Corporation shall not be liable for any incidental special or consequential damages If a problem occurs please contact ILX Lightwave Corporation with the instrument s serial number and thoroughly describe the nature of the problem April 2012 vii LDT 5910C and LDT 5940C Returning an Instrument If an instrument is to be shipped to ILX Lightwave for repair or service be sure to Obtain a Return Authorization number RA from ILX Customer Service Attach a tag to the instrument identifying the owner and indicating the required service or repair Include the instrument serial number from the rear panel of the instrument Attach the anti static protective caps that were shipped with the instrument Place the instrument in the original packing container with at least 3 inches 7 5 cm of compressible packaging material Shipping damage is not covered by this warranty Secure the pac
17. Enables the TEC Output April 2012 42 LDT 5910C and LDT 5940C NAME FUNCTION PID lt P gt lt I gt lt D gt Temperature Control Loop PID constants PID ATUNE RUN STOP Auto PID Tuning returns IDLE RUNNING PASS FAIL PID PRESET lt Name gt Stored PID Presets RADix Returned integer format BINary DECimal HEXadecimal OCTal SENsor ICI ICV THERM1OUA THERM100UA Temperature sensor selection THERMAUTO THERMLINEAR RTD1IMA RTD2_5MA SET ITE lt amps gt TEC Current Setpoint ITE mode SET SENsor lt value gt Sensor Control Setpoint sensor mode SET Temp lt degrees gt Temperature Control Setpoint temp mode STATus Value of the device status register SYNTAX 1 0 5910B compatible commands for 5910C April 2012 43 LDT 5910C and LDT 5940C LDT 5910B Compatibility for LDT 5910C To enable compatibility from the 5910B send SYNTAX 0 The following commands are provided for compatibility with software written for the 5910B COND CONST CONST DEC ENABIe COND ENABIe COND ENABIe EVEnt ENABIe EVEnt ENABIe OUTOFF ENABIe OUTOFF ERRors EVEnt GAIN GAIN The following 5910B commands are not compatible IST PRE PRE PUD PUD CAL ITE CAL ITE CAL SENsor CAL SENsor DELAY INC ITE LIMit ITE LIMit ITE LIMit THI LIMit THI LIMit TLO LIMit TLO MODE MODE R MODE T OUTput OUTput R DISplay AUTO DISplay AUTO DI
18. If cleaning is required use a clean dry cloth Do not use solvents April 2012 2 LDT 5910C and LDT 5940C SETUP FID CONTROL MODE O BE em PRESET SELECT TEMP HEAT i Sa MANUAL ss mt oer COL ai m AUTO SET A SNSA LIM jo i RECALL STORE MODE on Ei Figure 1 1 LDT 5910C and LDT 5940C Front Panel ee eeeeeee e e eg _ 260866 SE ODEORE eceecescoesecosen Wi e CTIE L amp eegougvgeuuss RAF eeeeoe seed e W OUTPUT BOZEMAN MONTANA 9715 USA e e 2 E 7 INTERLOCK EX TD sla E a BESSER _ 220 2a0v 2A Figure 1 2 LDT 5910C Rear Panel FREQ 50 60Hz April 2012 3 LDT 5910C and LDT 5940C MADE IN USA ANALOG IN 000000008000 CCS 000000000000000 ee c ege e egeee gt S EN ILX Lightwave onus sone eeceeeceeseo G 20 0000890800000 98 0000086080000 Ki O OUTPUT Figure 1 4 LDT 5940C Rear Panel April 2012 4 LDT 5910C and LDT 5940C Options and Accessories Options and accessories available for LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers include the following CC 501S 5910C only April 2012 5 LDT 5910C and LDT 5940C Specifications CONTROL SYSTEM Temperature Control Range Thermistor Sensor IC Sensor RTD Sensor 100 C to 200 C 100 C to 150 C 100 C to 200 C Temperature Setpoint and Measurement Precision Accuracy 0 C 25 C 50 C 15 C
19. LIMit Temp LOw Description Sets the more negative temperature at which the temperature controller will turn off Parameters Degrees minimum temperature at which the controller will shut off Notes Only used in T mode Reset Value 0 Examples LIM T LO 20 0 action sets the lower temperature limit to 20 0 C LIMit TOLerance lt value gt Description Sets the settling tolerance for determining when OPC is complete or an EVENT is set Parameter This value is the settling value dependant on mode Takes the same units as the SET commands This has a maximum timeout of 30 seconds when used with OPC commands This value is only applicable in T mode Notes Reset Value 2 Examples LIMit TOL response 0 3 means a tolerance window of 0 3 C MEASure ITE Description Measured TEC current Response Amps TEC current Notes Positive current indicates the TEC is cooling Negative current indicates the TEC is heating Examples MEAS ITE response 2 2 means the controller output current is set to 2 2 A MEASure SENsor Description Measures the sensor value April 2012 59 LDT 5910C and LDT 5940C Response Ohms Resistance when using a thermistor or RTD pA and V when using ICI and ICV sensors respectively Notes The response is the measured sensor regardless of control mode and the units are dependent upon which sensor is selected For thermistor or RTD the value will be in ohms ICI in MicroAmps ICV in Volts E
20. Queue SRE lt nrf gt Not et SRE Error Queue Master Status Summary Device Condition Status Register COND Device Condition Status Enable Register ENABle COND lt nrf gt ENABle COND Device Event Status Register EVEnt Device Event Status Enable Register ENABle EVEnt lt nrf gt ENABle EVEnt Figure 3 5 Status Reporting Scheme April 2012 36 LDT 5910C and LDT 5940C 00 Over Current Limit 01 Over Voltage Limit 02 Over Low T or R Limit 03 Over High T or R Limit 04 N A 05 N A 06 Sensor Open 07 TEC Open 08 N A 09 Out of Tolerance 10 Output On 11 CAL Ready 12 N A 13 N A 14 N A 15 N A 00 Over Current Limit 01 Over Voltage Limit 02 Over Low T or R Limit 03 Over High T or R Limit 04 N A 05 N A 06 Sensor Open 07 TEC Open 08 N A 09 Out of Tolerance 10 Output On 11 CAL Ready 12 N A 13 N A 14 N A 15 N A Operation Complete Definition Note that Bit O of the Standard Event Status Register contains the status of the Operation Complete flag Enabling this bit via the ESE command allows the user to update Bit 5 of the Status Byte Then if the SRE mask has Bit 5 set and the user issues an OPC command the SRQ signal will be generated upon completion of the currently processed commands This may be used to initiate service request routines which depend on the completion of
21. mA e IC Current e IC Voltage Sensor Calibration Constants The calibration constants menu allows the user to enter sensor constants for thermistor current and voltage IC and RTD For more information see the Sensor Options later in this chapter External Fan Control Allows the user to enable or disable the external fan The user can also set the voltage applied to an external fan Cable Resistance To increase the accuracy of the TEC voltage measurement at higher currents the user can enter a cable resistance The value entered for cable resistance should be equal to the round trip resistance between the temperature controller and the load If the wiring is identical on both sides of the connection as it is with ILX cables this value is double the resistance value measured between the temperature controller and the load The 4 wire capability of the LDT 5940C may be used instead if using a cable that supports this feature Cable resistance should be set to 0 000 Q when using 4 wire capability Analog Control Input Enables and disables the analog input feature for optimal stability if a signal is not applied to the input the analog control input should be disabled GPIB Address Adjust the GPIB address from 1 to 30 using the ADJUST knob Display Brightness Adjust the display brightness from 1 to 10 using the ADJUST knob STORE Button Stores instrument parameters for control mode setpoint limits sensor type calibrati
22. or voltage limits during the auto tune operation If the auto tune algorithm fails for a particular thermal system it may be necessary to modify the PID coefficients manually Mode SELECT Button Selects constant temperature constant sensor and constant current mode The selected mode is indicated by an illuminated LED The output is disabled when the control mode is changed ON Button Enables and disables the output An enabled output is indicated by an illumined LED A disabled output is indicated by a dark LED e TEMP Controls the LDT 5910C or LDT 5940C to a constant temperature e TE Sets the LDT 5910C or LDT 5940C to output a constant current e RSNSR Controls the LDT 5910C or LDT 5940C to a constant sensor value e HEAT Illuminated when positive current is flowing e COOL Illuminated when negative current is flowing e LIMIT Illuminated if the LDT 5910C or LDT 5940C has reached the user defined current limit Display The large 7 segment LED displays the measured value in the selected operating mode When the setpoint is being adjusted the 7 segment LED display will show set after the dimension and revert back to reporting the measured value after the three second timeout The dot matrix display at the bottom of the screen cycles through available measurement and mode setpoint The available measurement and setpoint parameters are listed under General Operation Procedures The measured values ar
23. output on OFF 0 Turns the output off April 2012 60 LDT 5910C and LDT 5940C Notes The output on bit 10 in the event or condition status register can be used to determine the actual point that the output is turned on or if it has automatically shut off due to an error condition Additionally OPC Or WA may be used to determine the time when the output reaches setpoint Reset Value OFF Examples OUTP A response of 0 means that the TEC output is off OUTP ON Enables pulse output PID lt P gt lt I gt lt D gt PID Description Temperature and sensor mode control loop constants Parameters P Proportional or Gain Term Determines how fast the control responds to changes in temperature Integral Term or Resets second Integrates the error to correct for disturbances Necessary for TEC controllers D Derivative Term or Lead Compensation This term is forward looking and corrects the controller that is moving to quickly toward the setpoint indino Notes The diagram for the PID controller is shown above The formula in classical notation is Current P BO I fe t dt D Sal where e t Setpoint Temperature Reset Value 20 0 5 0 Examples PID 24 5 6 8 0 action sets P 24 00 I 5 600 and D 8 000 PID 25 action sets P 25 00 and D are unchanged PID ATUNE RUN STOP PID ATUNE Description Controls the PID auto tune functionality The auto tune only works in T and R modes Parameters RUN
24. value can be expressed as V 10 mV K Where V is the nominal voltage produced by the LM335 and K is the temperature in Kelvin The LDT 5910C and LDT 5940C use V to determine the nominal temperature T by the formula T V 10mvV K 273 15 Where T is measured in C The temperature T which is displayed by the LDT 5910C and LDT 5940C is first calibrated as follows T C1 C2 10 0 T Where C1 and C2 are the constants stored by the user in the LDT 5910C and LDT 5940C for the LM335 When the LDT 5910C and LDT 5940C is shipped from the factory the LM335 measurement system is calibrated but the sensor C1 and C2 is not Nominally C1 0 and C2 10 In that April 2012 78 LDT 5910C and LDT 5940C case the temperature accuracy is typically 1 C over the rated operating range With C1 and C2 calibrated also the temperature accuracy is typically 0 3 C over the rated operating range The temperature accuracy may be improved over a narrow temperature range by a two point calibration of C1 and C2 However the LM335 is not perfectly linear and even with C1 accurately known and C2 uncalibrated there is a non linear absolute temperature error associated with the device This non linearity caused error is typically 0 3 C with the error associated with C1 assumed to be zero If a maximum absolute error of 1 C is tolerable no calibration of C1 or C2 is required just set C1 0 C2 1 If a maximum absolute error
25. values due to the fact that new values are not saved to non volatile memory until the last step of each calibration procedure April 2012 71 LDT 5910C and LDT 5940C Thermistor Calibration The following procedure calibrates the 100 pA or 10 pA constant current sources so that thermistor resistance measurements will be accurate This procedure does not calculate C1 C2 and C3 For information on calibrating the thermistor sensor see Application Note 4 Thermistor Calibration and the Steinhart Hart Equation 1 2 3 Under PARAM set the SENSOR to 100 pA or 10 pA Measure and record the exact resistance of a 36 kQ for 100 pA or 360 kQ for 10 pA metal film resistor A 4 point probe resistance measurement is recommended Connect the 36 KQ or 360 kQ metal film resistor to the sensor feedback pins of the 15 pin output connector of the LDT 5910C pins 7 and 8 or the 25 pin output connector of the LDT 5940C pins 14 and 15 Enter the sensor calibration mode by pushing the parameter RECALL and mode SELECT buttons at the same time The display will then indicate the sensor resistance in kQ Allow the measurement to settle for at least three seconds Press and hold in the parameter SET button and turn the ADJUST knob until the display indicates the same resistance you measured for the 36 kQ or 360 kQ metal film resistor Release the SET button and wait for the 7 segment display to exit the calibration mode Once the self calibration is comp
26. which may be set to cause the TEC output to be turned off are shown in Figure 3 6 The default factory settings are shown in Table 3 8 These settings are not affected by the PSC Power On Status Clear command TEC Output Off Register sfiahsfi2fiifols s 7 6 5 4 3 2 1 0 0 Over Current Limit 0 01 N A d 02 Over Low T or R Limit g 03 Over High T or R Limit A 04 N A 05 N A a 06 Sensor Open Logical 07 TEC Open OR ra a x 08 N A E D 09 N A ZK 10 N A SEREIS e 11 N A TA 12 N A S 13 N A 14 N A 15 N A TEC Output Off Enable Register ENABle OUT OFF lt nrf gt ENABle OUT OFF Figure 3 6 TEC Output Off Register Table 3 8 Default Output Off Register Settings Bit Reference 00 Over Current Limit 08 N A 01 N A 09 N A 02 Over Low T or R Limit 10 N A 03 Over High T or R Limit 11 N A 04 N A 12 N A 05 N A 13 N A 06 Sensor Open 14 N A 07 TEC Open 15 N A April 2012 38 LDT 5910C and LDT 5940C Command Timing This section describes for each device dependent command whether that command is performed in an overlapped or sequential manner In other words it states whether the next command may begin while the first is being executed or if it must wait until the first command is completed before its execution begins See the Operation Complete Definition earlier in this c
27. 2 18 LDT 5910C and LDT 5940C Notice also that the lower slope of the curve at the higher temperatures results in a smaller feedback signal It may be necessary if you are controlling to higher temperatures to use a thermistor with a different curve Vth 10 nA Vth 100 pA Resistance 20 C 40 C 60 C 80 C 100 C Figure 2 3 Example Thermistor Resistance vs Temperature LINEARIZED THERMISTOR The linearized thermistor mode of the LDT 5910C and LDT 5940C may be used when an expanded range of temperature operation is required but when ranging discontinuities are unacceptable The linearized thermistor mode provides 0 2 C accuracy over a temperature range of 15 C to 65 C and 0 1 C accuracy over a range of 5 C to 35 C without requiring the calibration of two sensors and without the discontinuity that may arise due to ranging in the auto ranging thermistor mode April 2012 19 LDT 5910C and LDT 5940C 1 40 5 Se Ei 10K Thermistor 100 uA Bias 10K Thermistor Linearized ee o Ei E o D Ei gt a CH Temperature Measuremeent Uncertainty C o DO Gi 0 00 T 7 1 35 15 5 25 45 65 85 Temperature C IC I SENSORS When an IC I sensor is selected the LDT 5910C and LDT 5940C measures temperature based on the current passed through the sensor An example of an IC I sensor is the Analog Devices AD590 This device delivers 1 A K or appr
28. 2012 7 LDT 5910C and LDT 5940C April 2012 8 LDT 5910C and LDT 5940C Chapter 2 General Operation This chapter is an overview of the operation of the LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers vV Power requirements Y Front panel operation Y General operating procedures Grounding Requirements The LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers come with a three conductor AC power cable The power cable must be plugged into an approved three contact electrical outlet or used with a three contact to two contact adaptor with the grounding wire connected to an electrical ground safety ground ILX Lightwave recommends connecting the instrument only to properly earth grounded receptacles The power cord connector and power cable meet IEC safety standards AC Line Power Requirements The LDT 5910C and LDT 5940C Thermoelectric Temperature Controller can be configured to operate at nominal line voltages of either 110 120 VAC or 220 240 VAC and for the LDT 5910CJ 100V model 100 110 VAC This is a factory fixed configuration which cannot be changed by the end user Check to be sure that the voltage indicated on the back panel of the instrument matches the power line voltage in your area The Power Up Sequence WARNING Prior to power up ensure the fan inlet located on the right hand side of the instrument has no obstructions that would impede airflow In addition ensure there is no obstruction in t
29. CT to change between P I and D To adjust the PID value press SET to move to the next value press SELECT To load a preset PID value use the SELECT button to cycle to the Adjust Preset screen and then press the SET button then using the SELECT or ADJUST knob display the preset PID that you want to load Once the correct preset is displayed press the SET button to load the values April 2012 15 LDT 5910C and LDT 5940C Auto tune The auto tune mode will calculate a thermal system s PID coefficients through an iterative PID temperature control process To enter the auto tune mode first press MODE until the AUTO LED is illuminated and then SET to begin the auto tune procedure When the LDT 5910C and LDT 5940C successfully completes the auto tune the instrument will revert back to MANUAL and the calculated PID values will overwrite the current PID values in MANUAL mode If the auto tune process fails an error will be displayed on the screen For more information on the auto tune process see Appendix B Additional auto tune methods may be available in the future via a firmware upgrade for more information contact sales at 800 459 9459 sales ilxlightwave com There are limitations to the auto tune feature Any of the following will cause the auto tune algorithm to fail e Thermal systems requiring the proportional term to be less than 0 5 e Noisy temperature measurements e Reaching any output off enable condition such as temperature
30. Common Callendar Van Dusen constants are listed below and are used as default values in the LDT 5910C and LDT 5940C e A 3 908 x 10 e B 5 775x 10 e C 4 183 x 10 April 2012 21 LDT 5910C and LDT 5940C For optimal accuracy and stability the 1 mA current source should be selected for RTD sensors with resistance of 200 Q to 1500 Q and the 2 5 mA range should be used with resistance of 1 Q to 200 Q In general the change in resistance per change in temperature is much lower for a typical 100 Q RTD than that of a typical 10 KQ thermistor The proportional and integral terms for the PID loop must be increased appropriately when using an RTD sensor for optimal setting time and stability Safety Limits TEC modules may be damaged by excessive current so module manufacturers typically specify a maximum safe operating current for their module The LDT 5910C and LDT 5940C provides a current limit feature that allows you to set the maximum current that the controller supplies It is normal for the controller to operate at the current limit especially when the load temperature is far from the setpoint The current limit LED will display on the front panel when the controller is in a current limit condition If the heatsink is too small for the application it eventually becomes heat saturated where in the heatsink can no longer dissipate the heat being generated When the heatsink becomes saturated the TEC current increases in an attempt to co
31. DT 5910C or LDT 5940C remotely its GPIB address must be known Simply press the PARAM button until GPIB Address is displayed in the display The factory default address is GPIB ADDRESS 1 Changing the GPIB Address Every device on the GPIB bus must have a unique address If it is necessary to change the address press the PARAM button until the GPIB address is displayed Then press the SET button and adjust the knob until the desired address value is shown When the display times out the new GPIB address will be stored in nonvolatile RAM The allowable address range is 1 30 for primary GPIB addressing It is not recommended that zero be used for an address as that is typically reserved for the GPIB controller installed in the computer Extended GPIB addressing is not implemented Basic USB concepts Universal Serial Bus USB is a specification to establish communication between devices and a host controller which has effectively replaced a variety of earlier interfaces such as serial and parallel ports There are three USB standards available including USB 1 1 USB 2 0 and USB 3 0 Our device is designed to conform to the USB 2 0 standard and USBTMC 488 substandard USB cables use 4 lines Power Ground and a twisted pair differential data lines The USB connectors are designed so that power and ground are applied before the signal lines are connected When the host powers up it performs the enumeration process by polling each of the
32. FF lt nrf gt ENABle OUT OFF Notes Enable registers normally retain their values through power OFF ON unless the power on status clear flag is set true See PSC Examples ENAB OUTOFF 1 Enables the over current limit condition to turn off output ERRors Description Requests a list of errors which have occurred since the last ERR request Parameters None Response ASCII character string list of error numbers separated by commas Notes 0 no errors reported See chapter 5 for a list of error numbers Examples ERR Response 0 means no errors to report Errors Response 501 means over temperature EVEnt Description Requests the value in the device event status register Response A value between 0 and 65535 April 2012 56 LDT 5910C and LDT 5940C Notes Examples Logical k OR Device Event Status Register EVEnt 00 Over Current Limit 01 Over Voltage Limit 02 Over Low T or R Limit 03 Over High T or R Limit 04 N A 05 N A 06 Sensor Open 07 TEC Open 08 N A 09 Out of Tolerance 10 Output On 11 CAL Ready 12 N A 13 N A 14 N A 15 N A bahbahatahaleiel Tielslalatzlol Device Event Status Enable Register ENABle EVEnt lt nrf gt ENABle EVEnt Enabled disabled events can be set by ENABle EVEnt Status bits are set by events and cleared when read or cleared by command See CLS and EVEnt commands See Chapter 3 for more information a
33. Splay R DISplay R DISplay SET DISplay SET DISplay T DISplay T ITE LOCK ADJ 44 R RADix RADix SET R SET T SENsor STEP STEP T T TOLerance TOLerance LOCK ADJ MESsage MESsage SECURE SYNTAX SYNTAX TERM TERM TIME TIMER LDT 5910C and LDT 5940C April 2012 Command Reference The following pages contain a reference for common commands of the LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers CLS Clear Status Description Notes Examples Clears all status event registers and the error queue Useful to clear registers before enabling service requests SRQ CLS ESE lt integer gt Standard Event Status Enable Description Parameters Notes Examples ESE Sets the bits in the standard event status enable register The value must be between 0 and 255 The integer sent as a parameter is expressed in binary form when an event occurs in the standard event status register that matches the corresponding bit in the standard event status enable register bit 5 will be enabled in the status byte register See ESR for a description of each bit in the status register along with a diagram of the reporting structure ESE 40 Sets the standard event status enable register to enable bit 5 of the status byte register if a device dependent error or a command error occurs 40 274 2 Event Status Enable Query Description Parameters Not
34. Starts the auto PID tuning algorithm STOP Halts the auto tuning algorithm Responses IDLE The PID autotuning algorithm has not been performed RUNNING The auto tune algorithm is performing an analysis PASS The auto tune algorithm has completed and values have been saved to the system constants FAIL The auto tune algorithm could not complete System PID values have not been updated Reset Value IDLE Examples PID ATUNE RUN Action Start autotuning PID PRESET lt name gt PID PRESET Description Restores preset PID constants for 5910B compatibility and select laser diode mounts Parameters name DEFAULT GAIN1 GAIN3 GAIN10 GAIN30 GAIN100 GAIN300 LDM4405 LDM4407 LDM4409 LDM4412 LDM4980 and LDM4990 Response Returns a list of comma separated strings that are all of the valid preset commands April 2012 61 LDT 5910C and LDT 5940C Notes Reset Value Examples The 5910B compatible gains are called with GAIN where is the gain number for the 5910B For preset mounts the syntax is the model name of the mount without dashes i e LDM4405 is the preset constnants for an LDM 4405 The response includes each preset value in quotes To set a preset quotes are not used DEFAULT PID PRESET LDM4405 Action will use the default PID values for the LDM4405 mount RADIX BINary DECimal HEXadecimal OCTal RADIX Description Parameters Notes Reset Value Examples Determines the respo
35. U S A 59715 8642 www ilxlightwave com When you contact us please have the following information Model Number Serial Number End user Name Company Phone Fax Description of what is connected to the ILX Lightwave instrument Description of the problem Kb WWW Www If ILX Lightwave determines that a return to the factory is necessary you are issued a Return Authorization RA number Please mark this number on the outside of the shipping box You or your shipping service are responsible for any shipping damage when returning the instrument to ILX Lightwave ILX recommends you insure the shipment If the original shipping container is not available place your instrument in a container with at least 3 inches 7 5 cm of compressible packaging material on all sides We look forward to serving you even better in the future April 2012 ix LDT 5910C and LDT 5940C April 2012 x LDT 5910C and LDT 5940C Chapter 1 Introduction and Specifications This chapter is an introduction to the LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers v Safety Considerations and unpacking information vi Product Overview v Options and accessories v Specifications Safety Considerations M warnine If any of the following symptoms exist or are even suspected remove the LDT 5910C or LDT 5940C from service Do not use the LDT 5910C or LDT 5940C until trained service personnel can verify safe operation Visible damage Severe tr
36. User s Guide 7 Thermoelectric Temperature Controllers LDT 5910C SS LDT 5940C kl UE Lightwave LDT 5910C Thermoelectric Temperature Controller eme age em param m PRESET Jose om TEMP HEAT TE SELECT COOL MANUAL AUTO SET R SNSR LIM b no srone J J wove fa SETUP PID CONTROL IDN AS Lic iniwmanre 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 70045102 April 2012 Table of Contents Safety Information and the Manual V General Safety Considerations eekEEEEEEEEEKEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE V Safety SYMMONS TE vi Safety Marking e EE vii WANA e vii Eae ii OII E A A E AE A EEE E EEE AA E EE E E E vii Returning JOS HTHERIETN dee eege eege viii Claims egen ene RB Lu LEE viii Comments Suggestions and Problems ssssnsssesessennnttnetreererrrtttrrrrennnrrrrrerreennn ix Chapter 1 Introduction and Specifications cccceeeeeeeeeeeeeeeeeeeeeeeeeeees 1 Safety Considerations EE 1 Aital Eelere EE EE EE SE 1 Shipping Kita eae a 2 tadsatealsteadiahetindanledsatisletiatea e Aaa aaa ata adaa a a a Rea 1 eier 2 OOPTHOMS AME ACCES SSONCS sce 5 secs city sarees Sy sen EES er 4 WPECIICALIONS EEEE EE 6 Chapter 2 General Operation
37. a2 Tg Tel and U Tar 7 Tg V Then C1 and C2 can be determined by the following C1 U V C1 and C2 V C2 6 Replace C1 with C1 by selecting the C1 parameter and entering the new C1 value Replace C2 with C2 by selecting the C2 parameter and entering the new C2 value April 2012 80 LDT 5910C and LDT 5940C Appendix B Auto Tune Method The LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers currently use a single auto tune method The auto tune algorithm will calculate a thermal system s appropriate PID coefficients through an iterative PID temperature control process The figure below describes the tuning process pictorially 31 6 Tuning Set Point 3 P amp D Values Tuned P Term is Lowered 30 7 Value W 29 T E 28 N P 5 Integral Term Added to Control 3 4 P Term being Decreased Causes Temperature Decrease 2 27 E v 26 ege 2 Auto Tune Start Only Proportional Term Used 25 K 1 Ambient Temperature 24 0 5 10 15 20 Time Minutes The auto tune algorithm starts controlling temperature Point 2 on graph with an arbitrary coefficient for the loop gain P term and slowly increases it until the temperature begins to oscillate Once the temperature begins to oscillate the P term is reduced by 40 and the D term is calculated Point 3 The derivative term D term is calculated from the period of the oscillations that occurred during the tuning of the P term The co
38. able to the 24 pin connector located on the rear panel The connector is tapered to ensure proper orientation Finger tighten the two screws on the cable connector A total of 15 devices can be connected together on the same GPIB interface bus The cables have single male female connectors on each end so that several cables can be stacked This allows more than one cable to be attached to any one device However the maximum length of the GPIB cables must not exceed 20 meters 65 feet total or 2 meters 6 5 feet per device As good practice the number of GPIB cables connected to one instrument should be limited to less than 6 USB Communication The USB connector is located on the back rear panel next to the GPIB connector This USB connector is the square B style connector A standard USB A B cable is required to communicate with the instrument To communicate with the instrument using USB please install the Virtual Com Port Driver found on the accompanying CD or website prior to connecting the unit to the PC Please refer to Chapter 3 for more detailed instructions on operating the instrument through USB Tilt Foot Adjustment The LDT 5910C and LDT 5940C have front legs that extend to make it easier to view the display To use them rotate the legs downward until they lock into position Rack Mounting The LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers may be rack mounted in a single or dual configuration by installing the
39. all previous commands For example the user may set the output temperature tolerance so that the temperature is considered to be in tolerance when it is within 0 2 C of the setpoint for 10 seconds Then they may enable an SRQ on Operation Complete set ESE 1 and SRE 5 and have an SRQ handling routine in their software which reads a new measurement after the temperature is within tolerance This allows the use of the operation complete features of the LDT 5910C or LDT 5940C without the need for program looping or polling which can tie up the GPIB bus Operation Complete on the LDT 5910C and LDT 5940C is defined as No operations to the TEC hardware are pending No EEPROM non volatile memory write cycles are in progress Note If the GPIB times out while waiting for a response either set the GPIB time out longer or use SRQ generated interrupts See the GPIB interface manual for time out configuration or SRQ programming setup The OPC OPC and WAI commands should not be used inside a calibration routine April 2012 37 LDT 5910C and LDT 5940C Output Off Register The Output Off Enable Register determines which conditions and events can cause the TEC output to be turned off This register is configured in a manner which is similar to the status reporting registers However its output is not reported in the Status Byte Register Rather it is directly tied to hardware which controls the output switching The events and conditions
40. and display RIGHT button simultaneously Using the measured resistance value calculate the current needed to achieve 6 Volts for the LDT 5910C across the 5 O resistor or 10 Volts for the LDT 5940C Adjust Iset to the calculated current by holding down the parameter SET button and turning the ADJUST knob Release the set button and allow at least three seconds for the instrument to settle at the current setpoint Measure the voltage using the DMM Adjust V to the measured voltage by holding down the parameter SET button and turning the ADJUST knob Release the SET button and allow at least three second for the instrument to drive to negative Iset Measure the voltage using the DMM Adjust V to the measured voltage by holding down the parameter SET button and turning the ADJUST knob Release the set button Once the self calibration is completed and calibration mode is exited the calibration constants will be stored to the non volatile memory and the display will return to its previous state 76 LDT 5910C and LDT 5940C Appendix A AD590 and LM335 Sensor Calibration The LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers use two constants slope and offset for calibrating linear IC thermal sensing devices such as the AD590 and the LM335 Offset is used as the linear or zero offset value and the slope is used as the slope or gain adjustment Therefore when accuracy is not critical offset should be set to a nominal value of
41. ansport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions If necessary return the LDT 5910C or LDT 5940C to ILX Lightwave for service and repair to ensure that safety features are maintained Initial Inspection When you receive your LDT 5910C or LDT 5940C Thermoelectric Temperature Controller verity that the following items were shipped with the instrument LDT 5900C Series Thermoelectric Temperature Controller Manual Power Cord Shipping Kit Shipping Kit The shipping kit for the LDT 5910C and LDT 5940C Thermoelectric Temperature Controller includes a USB A B cable and a CD containing the ILX Lightwave USB Driver February 2012 1 LDT 5910C and LDT 5940C Product Overview The LDT 5910C and LDT 5940C are high performance thermoelectric temperature controllers that offers a flexible extended temperature control range from 100 C to 200 C with a choice of temperature sensors The LDT 5910C features a linear bipolar output providing 32 Watts of power to drive most thermal loads This output stage offers the low current noise necessary to achieve the temperature stability required to meet demanding low noise and frequency stabilized laser applications The LDT 5940C features a switching output providing 60 Watts of temperature control power for applications requiring increased cooling or heating capacity The instruments support thermistor platinum RTD and IC temperature se
42. appropriate rack mount flange on either side of the enclosure All rack mount accessory kits contain detailed mounting instructions Refer to the Options and Accessories table in Chapter 1 for applicable rack mount accessory part numbers April 2012 10 LDT 5910C and LDT 5940C Connections Temperature Control Output A 15 pin DSUB connector 5910C or 25 pin DSUB connector 5940C is located on the back panel of the instrument The connections for each case are shown below LDT 5910C LDT 5940C pg n a M D A f O0000000 TF HOD OOOODOOOOOOOH KF WOO0000 OI O PIN NUMBER CONNECTION PIN NUMBER CONNECTION 1 TE Module 1 Sensor Sense Terminal 2 TE Module 2 Sensor Sense Terminal 3 TE Module 3 Fan 4 TE Module 4 N C 5 TE Module Shield 5 N C 6 Sensor Shield 6 Sensor TE Module Shield 7 Sensor 7 TE Module Sense Terminal 8 Sensor 8 TE Module Sense Terminal 9 N C 9 TE Module 10 N C 10 TE Module 11 N C 11 N C 12 N C 12 TE Module 13 N C 13 TE Module 14 Fan 14 Sensor 15 Fan 15 Sensor 16 Fan 17 Cable ID 1 18 Cable ID 2 19 N C 20 N C 21 TE Module 22 TE Module 23 N C 24 TE Module 25 TE Module M warnine The output terminals of the LDT 5910C or LDT 5940C should never be shorted together or loaded with less than 0
43. bout register structure EVE Response 2048 means that cal ready events occurred since the last EVE inquiry Event Response H800 is the same as 2048 except using hexadecimal numbering See RADix FAN ON OFF 0 1 FAN Description Parameters Notes Reset Value Examples External fan on off control ON 1 Fan on OFF 0 Fan off Use the FAN VOLL Tage command to configure the fan voltage 0 FAN 0 turn fan off FAN VOLTage lt volts gt FAN VOLTage Description External fan voltage Parameters Volts External fan voltage Notes Use the FAN command to turn the external fan on or off Reset Value 12 Examples FAN VOLT 11 FAN ON Apply 11 Volts to the fan April 2012 57 LDT 5910C and LDT 5940C LIMit ITE HIgh lt amps gt LIMit ITE HIgh Description Upper TEC current limit Parameters Amps Output current is clipped below this value in all control modes Notes Use inconjunction with LIMit ITE LOw to control the limit An error will be generated for a setpoint lower than the LOW limit Reset Value 2 5A Examples LIM ITE HI response 0 9 means the upper current limit is 0 9 A LIMit ITE LOw lt amps gt LIMit ITE LOw Description Sets the more negative peak limit of TEC current Parameters Amps Output current is clipped above this value in all control modes Notes Use in conjunction with LIMit ITE HIgh to control the limit An error will be generated for a setpoint lowe
44. bs 10 C to 40 C 40 C to 70 C lt 85 relative non condensing 1 hour CE LDT 5910C and LDT 5940C April 2012 NOTES te All values are specified for an ambient temperature of 23 5 C after a 1 hour warm up unless otherwise specified 2 Software limits of range Actual range depends on the physical load sensor type and TEC module used 3 Accuracy figures represent the uncertainty that the 5910C 40C adds to the measurement This figure does not include the sensor calibration uncertainties Thermistor accuracy figures are quoted for a typical 10k thermistor and 100 pA current setting for 5 C to 50 C 4 Temperature stability measurements made in a stable ambient environment 5 C with a 10 kQ thermistor on the 100 pA setting after a 2 hour warm up period Stability is defined as Tmax Tmin 2 over the measurement period 5 Measured over the full DC current range into a 1 Q load 6 Maximum resolution available when operating in the control mode using the 7 segment display resolution will be reduced when displayed on the lower display In remote operation 6 significant digits of resolution are reported Ze Measured at the output connector Users may enter in cable resistance to provide an accurate voltage measurement at the load In keeping with our commitment to continuous improvement ILX Lightwave reserves the right to change specifications without notice and without liability for such changes April
45. commended test equipment for calibrating the LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers are listed in Table 5 1 Equipment other than that shown in the table may be used if the specifications meet or exceed those listed Table 5 1 Recommended calibration equipment DESCRIPTION SPECIFICATION DMM 8 1 2 Digit Metal Film Resistors 36 kQ and 360 KQ for Thermistor 4 8 kO for LM335 20 kQ for AD590 12 KQ for Linear Thermistor 1 2 KQ and 200 Q for RTD High Power Resistors 1 Q 25 W for ITE 5 O 25 W Environmental Conditions ILX Lightwave recommends calibration at 23 C 1 0 C When necessary however the LDT 5910C and LDT 5940C Thermoelectric Temperature Controller may be calibrated at its intended use temperature if this is within the specified operating temperature range of 10 to 40 C Warm up The LDT 5910C and LDT 5940C should be allowed to warm up for at least 1 hour before calibration unless otherwise specified Calibration Adjustments There are seven calibrations that need to be completed for proper operation of the LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers These calibrations pertain to sensor measurement the ITE current measurement and the TEC voltage measurement If a problem arises during calibration which prevents normal completion calibration may be aborted by pressing the display RIGHT and LEFT buttons simultaneously This prevents alteration of stored calibration
46. e a sensor voltage limit of 6 V which is approximately 325 C RTD SENSORS When an RTD sensor is selected the LDT 5910C and LDT 5940C measures temperature based on the resistance An example of an RTD sensor is the Xian Diamond USA T2001SDL This device has a positive slope and a nominal resistance at 0 C of 100 ohms Two wire RTDs should be connected across the Sensor and Sensor pins pins 7 and 8 The resistance versus temperature function for typical platinum RTDs is accurately modeled by the Callendar Van Dusen equation as shown below Rr Ro 1 AT BT 100CT SCT where Ro Resistance Q at 0 C R Resistance Q at temperature T C T Temperature in C The A B and C are derived from resistance measurements at 0 C Ro 100 C R100 and 260 C Pen and are defined as follows A a a 5 100 B a 5 100 Creo a amp 1004 where a Rigo Ro 100 Ro RB Constant for T lt 0 C 6 Ro 1 a 260 Rago 4 16 Ro a For temperatures greater than 0 C the LDT 5910C and LDT 5940C controller derives the temperature by solving the following quadratic equation R At Ro2A AR B Ro Rr Ze 2RoB These sensor coefficients A B C and Ro are required for the LDT 5910C and LDT 5940C to accurately report the temperature when utilizing an RTD sensor Where Ro is the resistance of the RTD at 0 C Typical RTDs have a nominal resistance Ro of 100 Q or 1000 Q
47. e indicated by an equal sign as in Figure 2 2 a and the setpoint values are indicated by a colon sign as in Figure 2 2 b April 2012 16 LDT 5910C and LDT 5940C Figure 2 2 a The measured current Figure 2 2 b The setpoint current LEFT Button Cycles through available measurement and setpoint parameters that can be displayed in the left hand side of the display RIGHT Button Cycles through available measurement and setpoint parameters that can be displayed in the right hand side of the display ADJUST LED Indicates the status of the ADJUST knob an illuminated LED means that the knob is enabled and a dark LED means that the knob is disabled Error Indicators The LDT 5910C and LDT 5940C indicate operational errors on the measurement display with an error code A complete list of error codes can be found in Chapter 5 General Operating Procedures The discussion below presents guidelines for operation as well as some common operating procedures Remote operations are discussed in the next chapter M warnine The output terminals of the LDT 5910C or LDT 5940C should never be shorted together or loaded with less than 0 1 O Doing so may result in damage to the instrument Warm Up and Environmental Considerations To achieve the rated accuracy allow the LDT 5910C or LDT 5940C to warm up for at least one hour before use Operate the controller within the environmental limits specified in Chapter 1 The best accuracy is ach
48. ed at the factory with C2 1 and C1 0 nominal values The AD590 grades of tolerance vary but typically this means that without adjusting C1 or C2 the temperature accuracy is 1 C over its rated operating range If C1 and C2 are also calibrated the temperature accuracy is 0 2 C over its rated operating range However the AD590 is not perfectly linear and even with C1 accurately known there is a non linear absolute April 2012 77 LDT 5910C and LDT 5940C temperature error associated with the device This non linearity is shown in Figure A 1 reprinted from Analog Devices specifications where the error associated with C1 is assumed to be zero ABSO ERR DEGREES C Figure A If a maximum absolute error of 0 8 C is tolerable over the entire temperature range the one point calibration of C1 should be used If C1 is calibrated at 25 C and the intended operating range is 0 to 50 C a maximum error of about 0 2 C may be expected over that operating range If a greater accuracy is desired the two point method of determining C1 and C2 should be used Note however the absolute error curve is non linear therefore the constant C2 will vary over different temperature ranges LM335 Sensor The LM335 is a linear thermal sensor which acts as a constant voltage regulator It produces a voltage V which is directly proportional to absolute temperature over its useful range 40 C to 100 C This nominal
49. en raanei eebe eet EENS 69 E leede lte EE 71 Recommended Eouipment cece eeeeeeaeeeceeeeececsaaaeeeeeeeeesecanaececeeeeeeseeeeneeeeeeeesseeeaeees 71 Environmental Conditions sesisih riiai nii iei aia ira iA aai eiai EENS Ne 71 E ue EE 71 Calibration Adjustments sarreran penetra rene dE Reese 71 Thermistor Calibration cicsananwaieiie Gand nadie han ead al ae ee eee 72 Linearized Thermistor Mode Calibration cccccceeeeeeeeeeeeeneeeeeeeeeeeeeceeeaeeeseeeaeeesenaeeeseeaeeeeeeeaaees 72 IC I AD590 or equivalent Sensor Calibration ccccccceee eens ee etieeeeeenneeeeeseeeeesieeeeesieeeeeeaa 73 IC V LM335 or Equivalent Sensor Calibration cc ccceeeeeeeeeeeeeeecieee ee eneeeeeeieeeeetneeeeetiaeeeee 73 RIED Sensor Calibratlons szccsess cetse aa a a acted abe a aa Matt sbecaue Mb a aani 74 ITE e le lee Ir Le DEE 74 TEC Voltage Measurement Calbraton 76 Appendix A AD590 and LM335 Sensor Calibration a0aannnnaaaaneeeaaennn T7 RE e EE 77 ER 78 One Point Calibration Mettod seSEEEEEEEEEREEEREEEEEEEEEEEEEREREREEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEen 79 Two Point Calibration Met WEE 79 Appendix B Auto Tune Methode nnnasennnnneeennnennttrrnnnnertnnnnrrnnnnrnene nnne 81 April 2012 iii LDT 5910C and LDT 5940C February 2012 iv LDT 5910C and LDT 5940C Safety and Warranty Information vi Details about cautionary symbols vi Safety markings used on the instrument vi Information about the
50. er on PSC 0 Disable automatic power on clearing of the enable registers PSC1 Enable automatic power on clearing of the enable registers 47 LDT 5910C and LDT 5940C PSC Power on Status Clear Query Description Parameters Notes Examples RCL lt bin gt Recall Description Parameters Notes Examples RST Reset Description Parameters Notes April 2012 Requests the status of the power on status clear flag None Response 0 The enable registers are saved through power off on 1 The enable registers are cleared during power on Registers affected Condition Status Enable Event Status Enable Service Request Enable Standard Event Status Enable See Chapter 3 for more information on register structure PSC Requests state of power on status clear flag Recalls a stored setup configuration from memory A value from 0 10 Bin 0 is the factory set default configuration The SAV function is used to save configurations for convenient recall The current setup is automatically stored and recalled at the next power on RCL 0 response instrument is reconfigured to factory default settings Performs a device reset None 1 Clears OPC or OPC device requirements 2 Stops operation of overlapped commands 3 Sets all device specific function to a known state RST Value The reset command does NOT affect the following Output Queue Enable Registers Event Register
51. er representing the brightness the higher the number the brighter the display LED brightness is not adjustable DISPLay BRIGHTness 5 Set to medium display brightness 54 LDT 5910C and LDT 5940C ENABle COND lt integer gt ENABle COND Description Enables bits in the device condition status enable register Parameters 0 to 65535 Device Condition Status Register COND Or STAT 00 Over Current Limit 01 Over Voltage Limit 02 Over Low T or R Limit 03 Over High T or R Limit 04 N A 05 N A 06 Sensor Open 07 TEC Open 08 N A 09 Out of Tolerance 10 Output On 11 CAL Ready 12 N A 13 N A 14 N A 15 N A Device Condition Status Enable Register ENABle COND lt nrf gt ENABle COND Notes Enabled disabled conditions can be set by ENABle COND Changing condition status may be monitored by COND See Chapter 3 for more information about register structure Examples ENAB COND Response 1 means that over current limit will be reported in status byte bit 3 Enable COND Response H1 is the same as 1 except using hexadecimal numbering See RADix ENABle EVEnt lt integer gt ENABle EVEnt Description Enables bits in the device event status enable register Parameters 0 to 65535 Device Event Status Register EVEnt 00 Over Current Limit 01 Over Voltage Limit 02 Over Low T or R Limit 03 Over High T or R Limit 04 N A 05 N
52. er these lines contain data or interface messages DIO1 DIOS DIO2 DIOG DIO3 DIO7 DIO4 DIO8 EOI REN DAV GND Twisted pair with DAV NRFD GND Twisted pair with NRFD NDAC GND Twisted pair with NDAC IFC GND Twisted pair with IFC SRQ GND Twisted pair with SRQ ATN GND Twisted pair with ATN SHIELD SIGNAL GROUND Figure 3 2 GPIB Connector Three handshake lines ensure that all data and messages are reliably transferred NRFD not ready for data indicates whether a device can receive the next byte of data or message NDAC not data accepted indicates whether a receiving device has accepted a byte of data or message DAV data valid indicates that the signal levels on the data lines are stable and available for the receiving device s to accept Five interface management lines control the flow of information April 2012 27 LDT 5910C and LDT 5940C ATN attention is set by the controller in charge to define the I O lines for data or interface messages IFC interface clear is set by the system controller to initialize the bus and assert itself as controller in charge REN remote enable is set by the controller to place addressed devices into remote or local front panel control mode SRQ service request can be set by any device in the system to request service from the controller EOI end or identify is used by talkers to identify the end of a message Reading the GPIB Address Before operating the L
53. erable Command syntax does not vary between communication protocols However the commands which affect GPIB hardware operation will not be useful For example SRE may be sent via USB but service request SRQ via GPIB would not be visible since USB has no hardware to support it This is because SRQ is a function of the GPIB interface hardware and is not available via USB All commands received by the USB interface are acknowledged by the instrument transmitting Ready when the command operation is complete Queries are acknowledged by the specific query response message Multiple commands queries separated by semicolons and issued as one command string are only acknowledged with a Ready response if the entire command string contains no queries See the Command Separators section later in this chapter for additional details The LDT 5910C and LDT 5940C terminates all RS 232 transmitted responses with lt CR gt lt LF gt Carriage Return Line Feed characters The LDT 5910C and LDT 5940C expect all commands or queries to be terminated with any of the following characters lt CR gt Carriage Return lt LF gt Line Feed or ASCII 250 character Hex OxFA Command Syntax This section describes command syntax and structure This information must be understood in order to effectively write GPIB control programs The syntax of GPIB commands follow the rules defined in the IEEE 488 2 standard Letters Any GPIB command or
54. ernal Fan Control Output Output Voltage Range Maximum Current TEC OUTPUT Type 59100 5940C Isolation Current Setpoint Range Current Setpoint Resolution Current Setpoint Accuracy Current Limit Range Current Limit Accuracy Voltage Measurement 7 Range Resolution Accuracy Compliance Voltage Maximum Output Power Current Noise and Ripple GENERAL Connectors TEC I O GPIB USB Analog Input Power Requirements LDT 5910C and 5940C LDT 5910C and 5940C LDT 5910Cu Size HxWxD Weight LDT 5910C Weight LDT 5940C Operating Temperature Storage Temperature Humidity Warm Up Compliance Steinhart Hart 3 constants Slope Offset R A B C 5Vto 5V gt 100 kQ 2 C V 5 Hz n o and n c relay contacts 0to 12V 500 mA Bidirectional linear Bidirectional switch mode Floating with respect to earth ground 4 00 A to 4 00 A 5910C 5 00 A to 5 00 A 5940C 0 01A 0 05 A 4 05 A to 4 05 A 5910C 5 05 A to 5 05 A 5940C 0 05 A 8 00 V to 8 00 V 5910C 12 00V to 12 00 V 5940C 0 01 V 0 01 V 8 V 5910C 12V 5940C 32 W 5910C 60 W 5940C lt 1 mA rms 5910C lt 2 mA rms 5940C Female 15 Pin D sub 5910C Female 25 Pin D sub 5940C IEEE 488 1 2 0 BNC 110 130 VAC 50 60 Hz 1 A 220 240 VAC 50 60 Hz 0 5 A 100 110 VAC 50 60 Hz 1 A 102 mm x 216 mm x 356 mm 4 0 x 8 5 x 14 0 4 9 kg 10 8 Ibs 3 8 kg 8 3 I
55. es Examples February 2012 Determine the contents of the standard event status enable register None The response is a value between 0 and 255 representing the bits of the standard event status enable register when expressed in base 2 binary format See ESR for a description of each bit in the status register along with a diagram of the reporting structure ESE A response of 68 means the user request and query error bits have been enabled in the standard event status enable register 68 2 2 45 LDT 5910C and LDT 5940C ESR Standard Event Status Register Query Description Determine the contents of the standard event status register Parameters None Notes Reading this register clears the contents The response is a value between 0 and 255 representing the bits of the standard event status register when expressed in base 2 binary format The event bit is set when a specific event occurs Standard Event Status Register ESR 0 Operation Complete To Status Byte 1 Request Control Bit 5 2 Query Error lt Logical 3 Device Dependent OR Error 4 Execution Error 5 Command Error 6 User Request 7 Power On Standard Event Status Enable Register ESE lt nrf gt ESE Bit 0 Operation Complete is set when all pending device operations have been finished after OPC common command has been executed Unused and always reports 0 Query Error means that data in the out
56. esponding bit in the other register is either set to one or transitions from zero to one at the same time Chapter 3 has detailed information on status reporting Service Request Generation Status Byte Register STB 0 N A 1 N A 2 TEC Event Summary 3 TEC Cond Summary 4 Message Available 5 Event Status Summary 6 Service Request Master Status Summary 7 Error Available Service Request Enable Register SRE lt nrf gt SRE SRE 16 Enables the service request enable register to generate a service request when a query generating message is available to read from the output queue 49 LDT 5910C and LDT 5940C April 2012 SRE Service Request Enable Query Description Parameters Notes Examples STB Returns the enabled bits in the service request enable register None The response is a value between 0 and 255 representing the bits of the standard event status enable register when expressed in base 2 binary format SRE A response of 16 signifies that the message available summary bit is enabled Status Byte Query Description Parameters Notes Examples TST Self Test Description Parameters Notes Examples April 2012 Returns the value of the status byte register None The response is the sum of the enabled bits and must be a value between 0 and 255 Service Request Generation Status Byte Register STB 0 N A 1 N A 2 TEC Even
57. hapter for conditions about setting the operation complete flag Sequential Overlapped Commands All device dependent commands are executed in an overlapped manner subsequent commands may begin before the current command has completed Some common commands are sequential the next command must wait until this command has completed All device dependent commands are executed in an overlapped manner The operation complete flag is set after the conditions outlined in the Operation Complete Definition have been satisfied The WAI common command is an example of a sequential command which forces the next command to wait until the no operation flag is true This is essentially the same as waiting for the OPC flag to become true because the no operations pending flag is used to set the OPC flag bit 0 of the Standard Event Status Register Commands which change the status of the instrument limits or change its mode step value or status enable registers will not have their OPC flag set until all current writing to non volatile memory has been completed This ensures the OPC flag is never set prematurely Query Response Timing Query responses are evaluated at the time the query request is parsed and not at the time the response message is sent In most cases this does not create a problem since the time between parsing a query and sending its response is small April 2012 39 LDT 5910C and LDT 5940C April 2012 40 LDT 5910C and LDT 5940C
58. he LDT 5910C or LDT 5940C into an AC power source supplying the correct mains voltage and frequency for your instrument refer to the rear panel for the correct ratings April 2012 22 LDT 5910C and LDT 5940C 2 Turnon the LDT 5910C or LDT 5940C The output will be disabled at power up and the unit will automatically configure its parameters to the state which existed when the power was last shut off 3 Press MODE until SNSR is selected 4 Press PARAM to adjust the applicable limits sensor type calibration constants GPIB address display brightness and external fan control 5 Adjust the setpoint by enabling the ADJUST knob and enable the output 6 The user can display measured voltage current or temperature or the sensor setpoint in either the left or right side of the display by pressing the LEFT and RIGHT display buttons April 2012 23 LDT 5910C and LDT 5940C Constant Current Mode Operation 1 Plug the LDT 5910C or LDT 5940C into an AC power source supplying the correct mains voltage and frequency for your instrument refer to the rear panel for the correct ratings Turn on the LDT 5910C or LDT 5940C The output will be disabled at power up and the unit will automatically configure its parameters to the state which existed when the power was last shut off Press MODE until ITE is selected Press PARAM to adjust the applicable limits sensor type calibration constants GPIB address display brightness and external fan control
59. he Sensor and Sensor pins pins 7 and 8 for the LDT 5910C and pins 14 and 15 for the LDT 5940C Allow the measurement to settle for about three seconds Using the voltage reading on the DMM and the current calculated in step 5 calculate the exact internal resistance again using Ohm s law 72 LDT 5910C and LDT 5940C 8 Press and hold in the parameter SET button and turn the ADJUST knob until the display indicates the same resistance calculated in step 7 9 Reconnect the 12 kQ resistor and measure the voltage across the resistor 10 Disconnect the DMM 11 Calculate the parallel resistance using the internal resistance calculated in step 7 and the measured resistance of the 12 kQ resistor 12 Press and hold in the parameter SET button and turn the ADJUST knob until the display indicates the same resistance as calculated in step 11 13 Release the SET button and wait for the 7 segment display to exit the calibration mode Once the self calibration is completed the calibration constants will be stored to the non volatile memory and the display will return to its previous state IC I AD590 or equivalent Sensor Calibration The following procedure calibrates the IC sensor measurement so that the temperature measurement will be accurate This procedure does not calibrate C1 and C2 For information on calibrating the IC I sensor see Appendix A 1 Under PARAM set the SENSOR to IC I Measure the exact resistance of the 20 kQ
60. he rear that may impede airflow With the LDT 5910C or LDT 5940C connected to an AC power source pressing POWER supplies AC line power to the instrument and starts the following power up sequence where each display last two to three seconds e All front panel indicators are ON all 7 segment displays indicate 8 e All front panel indicators OFF e Display shows the model number the serial number and the firmware version of the controller February 2012 9 LDT 5910C and LDT 5940C During the front panel indicator test the LDT 5910C and LDT 5940C performs a self test to ensure that the internal hardware and software are communicating If the LDT 5910C and LDT 5940C cannot successfully complete the test an error message is displayed See Chapter 5 for a complete list of error messages After the self test the LDT 5910C and LDT 5940C configuration is set to the same state as when the power was last turned off To quickly set a different configuration you can use the recall function See Store and Recall for more information Firmware Upgradeability The firmware on the LDT 5910C and LDT 5940C can be reinstalled or upgraded via USB Contact ILX Lightwave technical support for information on upgrading the software of the LDT 5910C and LDT 5940C GPIB Communication The IEEE 488 GPIB interface connector is located on the rear panel directly above the power input module See Figure 1 2 on page 3 or Figure 1 4 on page 4 Attach the GPIB c
61. iant being recognized by USB Check the USB cable connection between the LDT 5910C and LDT 5940C and the computer April 2012 68 LDT 5910C and LDT 5940C Error Messages Error messages may appear on the LDT 5910C and LDT 5940C display when error conditions occur in the instrument In remote operation use ERR to read the current error list The ERR command returns a string containing up to 10 of the error messages that are currently in the error message queue Error Code Tables The error codes are classified and placed in tables corresponding to their classification The classifications are Command Errors Execution Errors Device Errors Query Errors and Instrument Specific Errors Table 5 1 Command Errors Table 5 2 Execution Errors ERROR CODE EXPLANATION Data out of range Table 5 3 Device Errors ERROR CODE EXPLANATION Table 5 4 Query Errors ERROR CODE EXPLANATION Query interupted Query unterminated April 2012 69 LDT 5910C and LDT 5940C Table 5 5 Instrument Specific Errors April 2012 70 LDT 5910C and LDT 5940C Calibration Overview The LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers should be calibrated every 12 months or whenever performance verification indicates that calibration is necessary All calibrations can be done with the case closed The instrument is calibrated by changing the internally stored digital calibration constants Recommended Equipment Re
62. ieved near the calibration temperatures General Guidelines for Sensor Selection and Safety Limits This section presents some guidelines to assist in selecting the optimal settings for your application Sensor Options The LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers can measure temperature through a variety of sensor options thermistors IC sensors IC I IC V or RTDs THERMISTOR When a thermistor sensor is selected the LDT 5910C and LDT 5940C measures temperature based on a negative temperature coefficient NTC thermistor An NTC thermistor is a device whose resistance decreases as its temperature increases The controller provides a sense current 100 pA or 10 pA through the thermistor which results in a voltage across the thermistor This voltage is used as a feedback signal by the LDT 5910C and LDT 5940C digital control loops to maintain a constant temperature The thermistor should be connected across the Sensor and Sensor pins pins 7 and 8 April 2012 17 LDT 5910C and LDT 5940C In constant temperature mode the quantity that is maintained constant by the controller is the sensor resistance In constant temperature mode T the LDT 5910C and LDT 5940C convert the temperature setpoint to a thermistor resistance setpoint using user defined constants The Steinhart Hart equation is used to convert a temperature to a resistance for thermistor sensors The equation describes the non linear resistance versus tempe
63. ific Notation 2 0e 1 2 0e 1 For more information on these definitions refer to the IEEE 488 2 standard There are no default values for omitted parameters If a command is expecting a parameter and nothing is entered an error is generated For further clarity in programming the Boolean values of one 1 and zero 0 may be used or their names as indicated in Table 3 5 Table 3 5 Substitute Parameter Values SUBSTITUTE NAME VALUE ON 1 OFF 0 RUN 1 STOP 0 April 2012 31 LDT 5910C and LDT 5940C Command Tree Structure The LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers device dependent commands are structured in a tree format as shown in Figure 3 3 Each of the legal paths is shown followed by its list of path options followed by the commands themselves It is recommended that the first time user begin learning the commands by using the full path notation Once familiar with the commands command path shortcuts may be used CLS ESE ESE ESR IDN OPC OPC PSC PSC RCL RST SAV SRE SRE STB TST WA April 2012 ANA EVENT FAN FAN FAN VOLT FAN VOLT ICI ICI ICV RTD A 7 MODE OFFS OFFS B C2 OUTOFF HI HI HI VTE MODE OUTP OUTP PID PID RAD RAD SEN SEN SET ITE SET ITE SET SEN SET SEN SET T SET T STAT SYNTAX SYNTAX CONST ENAB oe eT Lee E Eh ICV RTD THERM COND ITE SEN T TOL root
64. ight side of the display by pressing the LEFT and RIGHT display buttons 24 LDT 5910C and LDT 5940C April 2012 Chapter 3 Remote Operation This chapter is an overview of the remote operation of the LDT 5910C and LDT 5940C Thermoelectric Temperature Controller vi Fundamentals of Remote Operation vi Command Syntax Command Tree Structure vi Status Reporting Test and measurement equipment with remote operation capability will generally communicate through either GPIB or USB interfaces GPIB General Purpose Interface Bus is the common name for ANSIIEEE Standard 488 2 1987 an industry standard for interconnecting test instruments in a system USB Universal Serial Bus is the common serial communication protocol used by most computers for relatively fast communication Everything that can be done from the front panel can also be done remotely and in some cases with more flexibility For instance in remote mode there is access to functionality and modes not available from the front panel such as commands that will increment Temperature UP or decrement Temperature DOWN the temperature setpoint by a predefined step value The following sections explain the fundamentals of operating the LDT 5910C and LDT 5940C Thermoelectric Temperature Controller remotely through either the GPIB or USB computer interface GPIB Address The talk and listen addresses on the LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers are identical
65. iguration of your GPIB controller card or COM port Specifically note the information regarding the terminating character Remove all other instruments from the GPIB bus to isolate the LDT 5910C or LDT 5940C If this corrects the problem April 2012 67 LDT 5910C and LDT 5940C re connect one instrument at a time until the problem returns Then check the other instrument for address conflicts and proper GPIB function Read the error queue remotely ERR The command syntax or command structure may be in error Read the status byte STB and condition register COND for possible device problems Slow or unexpected response to remote Check that no two devices are set to the same GPIB commands address Make sure that there are less than 15 devices on the bus Check the configuration of your GPIB controller card or COM port Specifically note the information regarding the terminating character Check that total GPIB cable length is less than 20 meters Remove all other instruments from the bus to isolate the LDT 5910C or LDT 5940C If this corrects the problem re connect one instrument at a time until the problem returns Then check the other instrument for address conflicts and proper GPIB function The LDT 5910C or LDT 5940C is not The LDT 5910C and LDT 5940C is not fully IEEE 488 2 responding to all ANSI IEEE 488 2 compliant commands The LDT 5910C or LDT 5940C is not The LDT 5910C and LDT 5940C is not USB 1 1 compl
66. imit 03 Over High T or R Limit 04 N A 05 N A 06 Sensor Open Logical 07 TEC Open OR 08 N A 09 Out of Tolerance 10 Output On 11 CAL Ready gt 12 N A g 13 N A 14 N A 15 N A Device Condition Status Enable Register ENABle COND lt nrf gt ENABle COND Notes The conditions reported to the status byte are set through the ENABle COND command The condition status may be constantly changing while the event status is only cleared when it is cleared or read See CLS and EVEnt commands See Chapter 3 for more information about register structure Examples COND Response 1 means there is an over current limit condition STAT Response 0x600 means output is on and it is out of tolerance SYNTAX 10 SYNTAX Description Sets the unit for compatibility with LDT 5910B Parameters 0 LDT 5910B compatibility for LDT 5910C 1 LDT 5910C AND LDT 5940C default operation Notes This causes the COND and EVENT registers to match the LDT 5910B model This will hide some conditions and functionality available in the LDT 5910C This is recalled at power up Reset Value Not affected by RST Examples Syntax 0 Use LDT 5910B compatible commands April 2012 64 LDT 5910C and LDT 5940C Chapter 5 Calibration and Troubleshooting This chapter is to help you resolve any problems you may experience with your LDT 5910C and LDT 5940C quickly If you need additional help please contact ILX Lightwave Custo
67. istor and a precision voltmeter in parallel at the sensor feedback pins of the 15 pin output connector of the LDT 5910C pins 7 and 8 or the 25 pin output connector of the LDT 5940C pins 14 and 15 April 2012 73 LDT 5910C and LDT 5940C 3 Enter the sensor calibration mode by pushing the parameter RECALL and mode SELECT buttons at the same time 4 Press and hold in the parameter SET button and turn the ADJUST knob until the display indicates the same voltage as shown on the precision voltmeter 5 Release the SET button and wait for the 7 segment display to exit the calibration mode and reflect the entered sensor resistance setpoint Once the self calibration is completed the calibration constants will be stored to the non volatile memory and the display will return to its previous state RTD Sensor Calibration The following procedure calibrates the 1 mA and 2 5 mA RTD temperature sensors so that the resistance measurements will be accurate This procedure does not calculate Ro A B and C For information on calibrating the RTD sensor itself see Application Note 4 Thermistor Calibration and the Steinhart Hart Equation 1 Under PARAM set the SENSOR to 1 mA or 2 5 mA RTD 2 Measure and record the exact resistance of a 1 2 KQ for the 1 mA or 200 Q for the 2 5 mA metal film resistors A 4 point probe resistance measurement is recommended 3 Connect the 1 2 KQ or 200 Q metal film resistor to the sensor feedback pins of the 15 pin ou
68. king box with fiber reinforced strapping tape or metal bands Send the instrument transportation pre paid to ILX Lightwave Clearly write the return authorization number on the outside of the box and on the shipping paperwork ILX Lightwave recommends you insure the shipment If the original shipping container is not available place your instrument in a container with at least 3 inches 7 5 cm of compressible packaging material on all sides Repairs are made and the instrument returned transportation pre paid Repairs are warranted for the remainder of the original warranty or for 90 days whichever is greater Claims for Shipping Damage When you receive the instrument inspect it immediately for any damage or shortages on the packing list If the instrument is damaged file a claim with the carrier The factory will supply you with a quotation for estimated costs of repair You must negotiate and settle with the carrier for the amount of damage April 2012 viii LDT 5910C and LDT 5940C Comments Suggestions and Problems To ensure that you get the most out of your ILX Lightwave product we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support You may contact us in whatever way is most convenient Phone 800 459 9459 or 406 586 1244 Fax 406 586 9405 On the web at ilx custhelp com Or mail to ILX Lightwave Corporation 31950 East Frontage Road Bozeman Montana
69. least one controller Talkers supply data while listeners accept data A system can consist of simply a talker and listener for example a meter connected to a datalogger or chart recorder Controllers designate talkers and listeners A controller is necessary when the active talkers or listeners must be changed When the controller is a computer it often also designates itself as a listener so it can collect data from designated talkers If there is more than one controller only one can be the Controller in Charge CIC Control can be passed from one computer to another In a multiple controller system there can be one System Controller capable of asserting control becoming CIC GPIB Cable Connections Standard GPIB connectors can be connected together stacked allowing the system to be configured linearly or in a star configuration bi Ki Linear Configuration 4 Star Configuration ki Figure 3 1 GPIB Cable Connection April 2012 26 LDT 5910C and LDT 5940C The GPIB Connector The standard GPIB connector consists of 16 signal lines in a 24 pin stackable connector The extra pins are used to make twisted pairs with several of the lines There are eight data input output lines three handshake lines and five interface management lines Eight data I O DIO lines carry both data including device dependent commands and interface messages The ATN interface management line determines wheth
70. leted the calibration constants will be stored to the non volatile memory and the display will return to its previous state Linearized Thermistor Mode Calibration The following procedure calibrates the linearized thermistor mode so that linearized thermistor resistance measurements will be accurate This procedure does not calculate C1 C2 and C3 For information on calibrating the thermistor sensor see Application Note 4 Thermistor Calibration and the Steinhart Hart Equation 1 2 3 April 2012 Under PARAM set the SENSOR to Linearized Measure the exact resistance of the 12 kO metal film resistor A 4 point probe resistance measurement is recommended Connect the 12 KQO resistor in parallel with a DMM to the sensor feedback pins of the 15 pin output connector of the LDT 5910C pins 7 and 8 or the 25 pin output connector of the LDT 5940C pins 14 and 15 Enter the sensor calibration mode by pushing the parameter RECALL and mode SELECT buttons at the same time The voltage measured across the load resistor will change when the calibration mode is entered Allow the measurement to settle for about three seconds Use the measured voltage and the exact resistance of the 12 kQ resistor and calculate the current using Ohm s law 1 V R Where V is the measured voltage and R is the exact resistance of the external resistor Press and release the SET button Disconnect the external 12 KQ resistor and measure the voltage across t
71. llows the user to adjust settings under PARAM RECALL and STORE The SET button will allow the user to select each menu item and a second SET press will allow the user to adjust the parameter When a parameter is being adjusted the units will flash at a constant frequency To return to the main menu the sub menu will contain one option that reads Return lt SET gt April 2012 13 LDT 5910C and LDT 5940C PARAM Button Uses a menu system for temperature controller setup functions including Limits Sensor Sensor Calibration Constants External Fan Control Cable Resistance Analog Input GPIB Address and Display Brightness The SET button selects each menu item and a second SET press allows the user to adjust each parameter The ADJUST knob can be used to cycle through and select or modify the following parameters Limits The Limits menu allows the user to select and modify the temperature current and sensor upper and lower limits e Temperature High Low Limits e Current Positive Negative Limits e Sensor High Low Limits Depending on the sensor selected the user can configure high and low limits for resistance current or voltage Sensor The Sensor parameter allows the user to select the type of sensor for the application Thermistor RTD IC V or IC I For more information on temperature sensors see the Sensor Options later in this chapter e Thermistor 100 pA 10 pA Auto Ranging Linearized e RTD 1 mA 2 5
72. ls This feature is enabled by connecting the appropriate sense terminals and is disabled by leaving them disconnected This feature is not available in the LDT 5910C April 2012 12 LDT 5910C and LDT 5940C Front Panel Operation This section describes the fundamentals of operation for the LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers The order of descriptions will follow the normal progression of how the user would typically configure the instrument for use for the first time i LX Lightwave LDT 5910C Thermoelectric Temperature Controller ENABLE DISPLAY LEFT RIGHT SETUP PID CONTROL MODE __ em eng mm m PRESET aw SELECT ea TEMP HEAT a MANUAL miTE see COOLm m AUTO SET mR SNSR LIM am b RECALL STORE MODE oN OCA Figure 2 1 Front Panel Display Power On Off The POWER button applies power to the LDT 5910C or LDT 5940C and starts the power up sequence described above Adjust Knob and Enable Button SEES nl The ADJUST knob and ENABLE button is located on an ENABLE the upper right side of the LDT 5910C and LDT 5940C front panel It is used to change the setpoints enter e parameter values enter the GPIB address enter Save DISPLAY or Recall bin numbers or enter instrument calibration data The ENABLE button indicates the two modes of operation of the knob Disabled LED off and Enabled LEFT RIGHT Ki LED on Setup SET Button A
73. lue gt Individual Callendar Van Dusen coefficients CONST THERMistor lt Cl1 gt lt C2 gt lt C3 gt Steinhart Hart thermistor coefficients CONST THERMistor C1 C2 C3 Individual Steinhart Hart coefficients DISPlay ON OFF 1 0 Blanks the front panel display DISPlay BRIGHTness lt 1 10 gt Controls VFD Brightness ENAB1le COND Programs conditions to set in the status byte ENABle EVEnt Programs events to set in the status byte ENABle OUTOFF Programs which events cause the output to shutoff ERRors Queries the errors in the error queue EVEnt Queries device events FAN ON OFF 1 0 Enables or disables an external fan FAN VOLTage lt volts gt External fan voltage LIMit ITE HIgh lt amps gt Upper TEC current limit LIMit ITE LOw lt amps gt Lower TEC current limit LIMit SENsor HIgh lt resistance pA mV gt Upper sensor protection sensor mode LIMit SENsor LOw lt resistance pA mV gt Lower sensor protection sensor mode LIMit Temp HIgh lt degrees gt Upper temperature protection temp mode LIMit Temp LOw lt degrees gt Lower temperature protection temp mode LIMit TOLerance lt value gt Setpoint tolerance window MEASure ITE Measured TEC current MEASure SENsor Measured sensor value R A mV MEASure Temp Measured temperature MEASure VTE Measured TEC voltage MODE T SENSOR ITE OUTPut ON OFF 1 0 Output control mode
74. mer Service See page viii for contact information ILX Lightwave Corporation provides in house calibration services for ILX instruments International customers may contact our services centers for regional calibration support Most ILX instruments including the LDT 5910C and LDT 5940C 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 around times are normally five business days or less Please contact ILX Customer Support see Comments Suggestions and Problems on page viii for contact information for additional calibration information For further assistance with technical solutions and troubleshooting visit www ilxlightwave com April 2012 65 LDT 5910C and LDT 5940C Troubleshooting Guide This section lists some common problems and corrective actions In the event that the corrective action does not resolve problem please contact ILX Lightwave For a comprehensive list of frequently asked questions see the ILX Lightwave website or contact ILX Lightwave Customer Service see Co
75. metal film resistor A 4 point probe resistance measurement is recommended 3 Connect the 20 kQ metal film resistor and a precision voltmeter across the sensor feedback pins of the 15 pin output connector of the LDT 5910C pins 7 and 8 or the 25 pin output connector of the LDT 5940C pins 14 and 15 M warnine For IC Current sensors used with the LDT 5940C the 4 wire sensor measurements pins 1 and 2 should not be connected The use of the 4 wire sensor will cause inaccurate sensor measurements 4 Enter the sensor calibration mode by pushing the parameter RECALL and mode SELECT buttons at the same time 5 Measure the voltage at the sensor pins Calculate the current using the resistance measured in step b 6 Press and hold in the parameter SET button and turn the ADJUST knob until the display indicates the current calculated in step 5 7 Release the SET button and wait for the 7 segment display to exit the calibration mode Once the self calibration is completed the calibration constants will be stored to the non volatile memory and the display will return to its previous state ICH LM335 or Equivalent Sensor Calibration The following procedure calibrates the IC V sensor measurement so that the temperature measurement will be accurate This procedure does not calibrate C1 and C2 For information on calibrating the IC V sensor see Appendix A 1 Under PARAM set the SENSOR to IC V 2 Connect a precision 4 8 KQ metal film res
76. mments Suggestions and Problems on page viii for contact information SYMPTOM CORRECTIVE ACTION The instrument does not power up Check the power cord to make sure that it is properly connected and check the wall outlet by connecting to a known operational device The instrument reads Over Temp The LDT 5910C or LDT 5940C has reached the user Disabled defined temperature limit This error occurs if the LDT 5910C or LDT 5940C temperature is above the upper temperature limit or below the lower temperature limit If the LDT 5910C or LDT 5940C is changing to a new setpoint which is near the temperature limit the temperature may overshoot which will trigger the error Verify the PID values used limit overshoot or set a higher limit This may also occur if the instrument is in thermal run away where the LDT 5910C or LDT 5940C has reached the current limit but the temperature continues to rise To correct thermal run away conditions additional heat sinking may be required The instrument reads Over Sens The LDT 5910C or LDT 5940C has reached the user Disabled defined sensor limit This error occurs if the LDT 5910C or LDT 5940C sensor reading is above the upper sensor limit or below the lower sensor limit If the LDT 5910C or LDT 5940C is changing to a new setpoint which is near the sensor limit the sensor value may overshoot which will trigger the error Verify the PID values used limit overshoot or set a higher limit
77. mples SEN THERM100UA action sets the sensor to thermistor and the sense current to 100 pA SET ITE lt amps gt SET ITE Description Constant current setpoint for use in ITE mode Parameter Amps Constant current setpoint in amps between 4 and 4 This will be clipped by the LIMIT ITE values Notes Examples SET ITE 2 5 action sets the setpoint for ITE mode to 2 5 A SET SENsor lt value gt SET SENsor Description Configures the control setpoint for use in sensor mode Parmeter Value sensor dependant value for the control point For thermistors and RTDs it is in ohms For ICI and ICV it is in microamps and volts respectively Notes Set this value after setting the SENsor as toggling between sensors will affect the range Reset Value 10000 Examples SET SENsor 0 002932 action sets the setpoint for the ICV sensor to 2 93 mV SET Temp lt degrees gt SET Temp Description Configures the temperature setpoint for use in temp mode Parameter Degrees the setpoint in C for which the temperature will control to in temp mode Notes Reset Value 25 Examples SET T 75 43 action sets the temperature setpoint to 75 43 C April 2012 63 LDT 5910C and LDT 5940C COND STATus Description Requests the contents of the device condition status register Response A value between 0 and 65535 Device Condition Status Register COND Or STAT 00 Over Current Limit 01 Over Voltage Limit 02 Over Low T or R L
78. nd Interface Messages ceceecceeeeeeeeeeeeceeeeeeeteeeeeeeseeeeeeeeceneaeeeseeeaeeeseneaeeeseeeaeeeseeaeeeeeeaeees 25 Talkers Listeners ANd Controllers a a r a a a A aaia trina 26 GPIB Cable Connections oas eege iaa ed EER EEA NAERA eet 26 Le GPIB CONECO orre E T N A enti 27 Reading thie GPIB AGJOS Sai E EE R A 28 Changing the GPIB Address ene aarian eaaa a ee E ARARE AEAEE AAE E 28 Basic Eeler eee ee ee Ee ee Eeee EEr Enrere EEEE eaae ERa ENEE 28 Changing Between Local and Remote COperaton 29 GPIB vs USB Communication EE 29 Command SY MAX EE 29 ET E EA E A E A E E A d 29 WHILE DEER eege ia a a a ee 30 BR ul Ee 30 ue e 30 Parameters ooren E Santee Eesen eet ug 31 Command Tree TEEN 32 Syntax S MMAY EE 33 IEEE 488 2 Common eer EE 34 Status Reporting o e reee cen cae ese E ee EEE E see EEEn EE snes ES EESE EEEn E Eare Eat Ect OAee 35 Event and Condition Registers eege ed aa a T EEE OE E E 35 Operation Complete Defmton AA 37 April 2012 ii LDT 5910C and LDT 5940C Output Off Ee r 38 Command TIMING DEE 39 Sequential Overlapped Commande rtt trtrnnnnnr rrt rrrreenn 39 Query Response TIMING ae 39 Chapter 4 Command Reference nnnnnreeeesrrttterrrrtttnrrttrernnrtrrenne rreren 41 Remote Command Reference Gummanm 41 LDT 5910B Compa EE 44 GCGommand Mer 45 Chapter 5 Calibration and Troubleshooting ccsseeeeeeeeeeeeeeeeeeeeeees 65 Belle ege REI TEE 66 Error Messages E 69 Error Code Tables oeei openee tao
79. ndard event status register OUTPUT ON OPC Will set bit O in the standard event status register when the output is on Operation Complete Query Description Parameters Notes Examples Places an ASCII character 1 into the instrument s output queue when all pending operations have been finished None This command is a sequential command that holds off all subsequent commands until the 1 is returned Make sure you have set the timeouts appropriately for using this command when you expect long delays OPC A response of 1 means that all overlapped commands are complete PSC lt number gt Power on Status Clear Description Parameters Notes Examples April 2012 Sets automatic power on clearing of the enable registers A number that rounds to the integer zero disables the power on clearing of enable register while any other number enables the power on clearing of enable registers Registers affected Condition Status Enable Service Request Enable Event Status Enable Standard Event Status Enable Factory default condition Disabled In the disabled state the values of the enable registers are saved through power OFF ON The power on status clear flag see PSC is set to false disallowing service request interrupts after power on In the enabled state the enable registers are cleared during power on The power on status clear flag see PSC 7 is set to true allowing service request interrupts after pow
80. ng SET selects the preset gain range on the display In MANUAL mode pressing SET allows the user to adjust the value on the display SET in the AUTO TUNE mode starts the auto tune procedure MODE Button Cycles through PRESET MANUAL and AUTO TUNE modes The selected mode is indicated by an illuminated LED The output will not be disabled if the user changes the PID Control Mode Preset The user can select one of the preprogrammed gain ranges by first selecting the PRESET LED using the MODE button then pressing the SELECT button or ADJUST knob to display the correct preset gain for the thermal load and pressing the SET button to select the gain The LDT 5910C and LDT 5940C implements the original gain ranges of the LDT 5910B Gain 1 3 10 30 100 and 300 Presets have also been implemented for specific ILX Lightwave mounts When a preset has been selected for a mount the LDT 5910C and LDT 5940C will set the PID values sensor type and current limits The following mounts are compatible with the LDT 5910C and LDT 5940C LDM 4405 LDM 4407 LDM 4409 LDM 4412 LDM 4980 and LDM 4990 Manual In MANUAL mode the user can adjust the PID values or select one of the preset PID values to load into the manual adjust note if the user adjusts the preset PID value loaded into manual PID adjust the change will not permanently affect the preset PID value To manually adjust the PID values first select the MANUAL LED by pressing MODE then press SELE
81. nse data format for the status event and enable registers BINary Returns the value in binary base 2 format prefixed with B DECimal Returns the value in decimal format HEXadecimal Returns the value in hexadecimal base 16 format prefixed with SH OCTal Returns the value in octal base 8 format prefixed with SC This does not affect the sending of data Any format can be used to send data as long as the proper prefix is used DECIMAL RAD dec action the decimal radix is selected 62 LDT 5910C and LDT 5940C April 2012 SENsor lt name gt SENsor Description Sensor selection for temperature conversion and for use in sensor mode Parameters ICI Temperature to current transducer i e AD590 ICV Temperature to voltage transducer i e LM335 THERM10UA Thermistor with a 10 uA current source Good for resistance gt 450 kQ THERM100UA Thermistor with a 100 uA current source Good for resistance lt 45 kQ THERMAUTO Thermistor with auto switching between 10 uA and 100 uA improves the measurement range THERMLINEAR Places a 10 kQ resistor in parallel with the thermistor to improve the accuracy and range of 10 kQ thermistor measurements RTD1MA Resistive temperature device i e PT1000 with a 1 mA current source Good for resistance gt 200 Q TRD2_5MA Resistive temperature device i e PT100 with a 2 5 mA current source Good for resistance lt 200 Q Notes Reset Value THERM100UA Exa
82. nsors In addition a unique linearized thermistor mode allows for the use of a standard 10 kQ thermistor over an extended temperature range from 15 C to 65 C A digital PID control loop delivers fast settling time while maintaining high stability For quick setup the LDT 5910C and LDT 5940C incorporate pre programmed PID values for common applications In addition a fast auto tune algorithm is available to automatically adjust the PID constants to support a wide range of thermal loads The GPIB and USB interfaces ensure trouble free remote programming and readout Features of the LDT 5910C and LDT 5940C include e Precision setpoint resolution of 0 01 C with long term temperature stability of 0 002 C LDT 5910C and 0 003 C LDT 5940C e Unique linearized thermistor mode allows a standard 10 KQ thermistor to be used over the range from 15 C to 65 C e Pseudo 4 Wire Sensor and TEC Measurement LDT 5940C only e Fully programmable PID control loop with twelve preset PID values e Auto tune algorithm automatically adjusts PID constants for a wide range of loads e External analog temperature control input e Independent heating and cooling current limits e TE voltage measurement e Heat only control mode e Remote commands in LDT 5910C and LDT 5940C are compatible with LDT 5910B remote commands e GPIB IEEE 488 and USB Interfaces e Normally open and normally closed output interlock e Variable speed external fan control
83. nt Calibration Method This procedure will work for any linear IC temperature sensor The accuracy of this procedure depends on the accuracy of the known temperatures externally measured It is used to determine the zero offset of the device and the gain offset slope 1 Allow the LDT 5910C or LDT 5940C to warm up for at least one hour Set the sensor to the desired sensor type and RECALL the constants for the particular device to be calibrated 2 Select the C1 parameter Read and record the value of C1 Select the C2 parameter Read and record the value of C2 April 2012 79 LDT 5910C and LDT 5940C 3 Place the sensor at an accurately known and stable temperature Ta1 Connect the sensor to pins 7 and 8 of the LDT 5910C 15 pin connector or to pins 14 and 15 of the LDT 5940C 25 pin connector Set the LDT 5910C or LDT 5940C for normal constant temperature T mode operation Allow the LDT 5910C or LDT 5940C to stabilize at the known temperature Ta1 and read the displayed temperature T Record these values 4 Repeat Step 3 for another known temperature T and the corresponding displayed temperature 1 The two known temperatures should at the bounds of the intended operating range The smaller of the two is intended operating range the better the calibration over that same range 5 Determine the new value of C1 C1 and C2 C2_ from the following calculations First determine the intermediate values U and V where V T T
84. ntrol loop is allowed to settle after the P and D terms are calculated and set If the defined tuning setpoint is above the ambient temperature the decrease in the P term will cause a decrease in the control temperature Point 4 After the temperature has stabilized the integral term I term is then added to the control loop Point 5 on graph The term is then increased until it causes the temperature to oscillate April 2012 81 LDT 5910C and LDT 5940C around the user defined tuning setpoint Point 7 on Graph The final term coefficient is set to 33 of the term value that is found to start oscillations in the temperature control loop This tuning method calculates PID coefficients that result in fast settling times and good setpoint stability The auto tune algorithm slowly moves towards the oscillation points of the thermal system to consistently find suitable PID coefficients on a wide range of thermal systems and to ensure that the thermal system will not be damaged The calculated PID coefficients are dependent upon the user defined current limit and setpoint temperature If a new setpoint temperature is desired that would require the controller to cool vs heat the Auto Tune feature can be used to calculate optimal PIDs for the new temperature setpoint The tuning times of the auto tune process will range from 2 to 10 minutes depending on the thermal system being tuned Typical tuning times are around 5 minutes Thermal systems
85. of 0 5 C is tolerable the one point calibration of C1 may be used see page C 5 If a greater accuracy is desired the two point method of determining C1 and C2 should be used see page C 6 Note however the absolute error associated with the constant C2 may vary over different temperature ranges One Point Calibration Method This procedure will work for any linear IC temperature sensor The accuracy of this procedure depends on the accuracy of the known temperature externally measured It is used to determine the zero offset of the device and it assumes that the gain offset slope is known and is correct 1 Allow the LDT 5910C and LDT 5940C to warm up for at least one hour Set the sensor to the desired sensor type and RECALL the constants for the particular device to be calibrated 2 Select the C1 parameter Read and record the value of C1 3 Place the sensor at an accurately known and stable temperature Ta Connect the sensor to pins 7 and 8 of the LDT 5910C 15 pin connector or to pins 14 and 15 of the LDT 5940C 25 pin connector Set the LDT 5910C and LDT 5940C for normal constant temperature T mode operation Allow the LDT 5910C or LDT 5940C Temperature Controller to stabilize at the known temperature Ta and read the displayed temperature Td 4 Determine the new value of C1 Cin from the formula C1n C1 Ta Td and replace C1 with C1n by selecting the C1 parameter and entering the new C1n value Two Poi
86. ol the load The additional current creates more heat that cannot be dissipated and subsequently more TEC current is applied This situation is referred to as thermal runaway and can cause a load and temperature controller to become damaged To help avoid damage caused by thermal runaway the LDT 5910C and LDT 5940C Thermoelectric Temperature Controller provides a high temperature limit setting When the load temperature exceeds the temperature limit the LDT 5910C and LDT 5940C turns off the TEC current and generates an error on the dot matrix display Constant Temperature Mode Operation 1 Plug the LDT 5910C or LDT 5940C into an AC power source supplying the correct mains voltage and frequency for your instrument refer to the rear panel for the correct ratings 2 Turnon the LDT 5910C or LDT 5940C The output will be disabled at power up and the unit will automatically configure its parameters to the state which existed when the power was last shut off 3 Press MODE until the TEMP LED is selected 4 Press PARAM to adjust the applicable limits sensor type calibration constants GPIB address display brightness and external fan voltage 5 Adjust the setpoint by enabling the ADJUST knob and enable the output 6 The user can display measured voltage current or sensor value or the temperature setpoint in either the left or right side of the display by pressing the LEFT and RIGHT display buttons Constant Sensor Mode Operation 1 Plug t
87. on constants and PID values for bins numbered 1 10 April 2012 14 LDT 5910C and LDT 5940C RECALL Button Recalls instrument parameters for control mode setpoint limits sensor type calibration constants and PID values for bins numbered 1 10 Recall bin O will reset all parameters to the factory defaults Non volatile memory is used for saving the instrument parameters When a store operation is performed all of the current instrument parameters are stored to a bin number 1 10 When that bin number is recalled the instrument configuration is recalled to the stored values To enter the STORE RECALL mode press either the STORE or RECALL button which will display the current bin number in the bottom of the screen The current bin number will be flashing and the ADJUST knob can be used to select a new bin The store or recall operation is performed when the SET button is pressed If the SET button isn t pressed after three seconds the LDT 5910C and LDT 5940C will time out and the new bin number will not be stored or recalled PID Control SELECT Button In PRESET mode pressing SELECT displays the selected preset gain In MANUAL mode pressing SELECT displays the last PID values used and in AUTO TUNE mode pressing SELECT displays the auto tuning method implemented Pressing SELECT repeatedly or using the ADJUST knob cycles through the presets and PID values SET Button In PRESET mode pressi
88. on describes the safety symbols and classifications Technical specifications including electrical ratings and weight are included within the manual See the Table of Contents to locate the specifications and other product information The following classifications are standard across all ILX Lightwave products Indoor use only Ordinary Protection This product is NOT protected against the harmful ingress of moisture IEC Class Equipment grounded type Mains supply voltage fluctuations are not to exceed 10 of the nominal supply voltage Pollution Degree II Installation overvoltage Category II for transient over voltages Maximum Relative Humidity lt 85 RH non condensing Operating temperature range of 10 C to 40 C Storage and transportation temperature of 40 C to 70 C Maximum altitude 3000 m 9843 ft This equipment is suitable for continuous operation April 2012 vi LDT 5910C and LDT 5940C Safety Marking Symbols This section provides a description of the safety marking symbols that appear on the instrument These symbols provide information about potentially dangerous situations which can result in death injury or damage to the instrument and other components Visible and or oo Ak EE FNA Alternating current invisible laser radiation Caution risk of Protective Caution electric shock Conductor hot surface Terminal Frame or chassis terminal Warranty ILX Lightwave
89. onnector diagram All the IEEE 488 2 Common Commands supported by the LDT 5910C and LDT 5940C are listed below April 2012 34 LDT 5910C and LDT 5940C Table 3 7 IEEE 488 2 Common Commands Supported by LDT 5910C and LDT 5940C CLS ESE ESE ESR IDN OPC OPC PSC PSC RCL RST SAV SRE SRE STB TST WA See Chapter 4 Command Reference for descriptions of all commands including common commands supported by the LDT 5910C and LDT 5940C Status Reporting This section contains information that is relevant for understanding instrument error and status reporting It also contains information regarding the use of the instrument status for generating interrupts for interrupt driven programs or subroutines Understanding the Operation Complete definition for the instrument is useful for program synchronization The Output Off Register section also contains information on configuring the conditions which force the TEC output off Event and Condition Registers In addition to the required IEEE 488 2 status reporting structure the LDT 5910C and LDT 5940C remote interface provides Event and Condition Registers for TEC controller operations The Event Registers are used to report events which occur during the operation of the LDT 5910C and LDT 5940C Thermoelectric Temperature Controller Events differ from conditions in that events signal an occurrence once and are not reset until
90. oximately 298 pA at 25 C The terminal of the transducer should be connected to the Sensor pin and the terminal should be connected to Sensor The nominal slope for the AD590 is 1 A K and the offset is nominally O pA but both can be adjusted to calibrate your particular sensor by entering the PARAM menu The sensor will have approximately 9 V across it at 25 C but will vary over the temperature range In IC I sensor mode the LDT 5910C and LDT 5940C have a sensor current limit of 600 UA which is approximately 325 C M warnine For IC Current sensors used with the LDT 5940C the 4 wire sensor measurements pins 1 and 2 should not be connected The use of the 4 wire sensor will cause inaccurate sensor measurements IC V SENSORS When an IC V sensor is selected the LDT 5910C and LDT 5940C measures temperature based on the voltage across the sensor An example of an IC V sensor is the National Semiconductor LM335A This device delivers 10 mV K or approximately 2 98 V at 25 C The terminal of the transducer should be connected to the Sensor pin and the terminal should be connected to Sensor The nominal slope for the LM335A is 10 mV K and the offset is nominally 0 mV but both can be adjusted to calibrate your particular sensor by entering the PARAM menu April 2012 20 LDT 5910C and LDT 5940C The sensor will have approximately 1 mA of current through it at all times In IC V sensor mode the LDT 5910C and LDT 5940C hav
91. put has been lost or that none was available Device Specific Error is an error has occurred that is neither a command query or execution error Execution Error means a parameter was evaluated to be outside the legal input range or capability Command Error means a command could not be interpreted by the parser Unused and always reports 0 Bit 7 Power On indicates that an off to on transition has occurred in the power supply CLS will clear this register oak wn Examples ESR A response of 32 means a command error has occurred IDN Instrument Identification Description Requests the instrument to identify itself Parameters None Notes Returns a string of instrument identification information The string contains a comma separated list of manufacturer model number serial number and firmware revision Examples IDN Responds with ILX Lightwave _LDT 5910C 59101111 1 00 1 00 April 2012 46 LDT 5910C and LDT 5940C OPC Operation Complete Description Parameters Notes Examples OPC Sets the operation complete bit bit 0 in the standard event status register when all pending overlapped commands have been completed None This command does not hold off subsequent operations You can determine when the overlapped commands have completed either by polling the standard event status register ESR7 or by setting up the status system such that a serve request is asserted when bit 0 is set in the sta
92. query must contain all of the letters or all of the upper case letters which are shown in the command definition Upper lower case does not matter it is used in this manual to identify optional letters Some examples of what works and what does not are shown below Table 3 1 Acceptable and Not Acceptable Spelling ACCEPTABLE NOT ACCEPTABLE DISP DS DISPlay or DISPLAY Displa or DISPL April 2012 29 LDT 5910C and LDT 5940C White Space White space is normally the space character space bar A single white space must separate a command from its parameters or data For example Table 3 2 White Space ACCEPTABLE NOT ACCEPTABLE ITE 3 0 ITE3 0 To enhance readability one or more white spaces may be used before a comma semicolon or terminator Since the computer normally places the terminator at the end of each command string line this simply means that an extra space character at the end of the command line works acceptably A query has no space between the mnemonic and the question mark For example Table 3 3 Query Formatting ACCEPTABLE NOT ACCEPTABLE DISPLAY DISPLAY Note Too many consecutive white spaces can overflow the 256 byte data I O buffer Terminators A program message terminator identifies the end of a command string These are the valid terminator sequences lt NL gt lt AEND gt lt NL gt lt AEND gt Many computers terminate
93. r than the HIGH limit Reset Value 2 5A Examples LIM ITE LO response 4 0 means the lower current limit is 4 0 A LIMit SENsor Hlgh lt resistance uA V gt LIMit SENsor Hlgh Description Parameters Notes Reset Value Examples Sets the more positive sensor measurement Dependant on the sensor selected when using a thermistor or an RTD sets maximum resistance In ICI and ICV maximum current and voltage respectively Only used in sensor mode 40000 Sensor THERM100UA LIM SEN HI 4501 00 action Sets the sensor upper limit to a maximum of 4501 Ohm LIMit SENsor LOw lt resistance uA V gt LIMit SENsor LOw Description Parameters Notes Reset Value Examples April 2012 Sets the more negative sensor measurement Dependant on the sensor selected when using a thermistor or an RTD sets minimum resistance In ICI and ICV minimum current and voltage respectively Only used in sensor mode 0 Sensor THERM100UA LIM SEN LO 450 00 action Sets the sensor lower limit to a minimum of 450 Ohm 58 LDT 5910C and LDT 5940C LIMit Temp HIgh lt degrees gt LIMit Temp Hlgh Description Sets the more positvie temperature at which the temperature controller will turn off Parameter Degrees maximum temperature at which the controller will shut off Notes Only used in T mode Reset Value 50 Examples LIM T HI 105 0 action sets the high temperature limit to 105 0 C LIMit Temp LOw lt degrees gt
94. rature characteristics of typical thermistors Calibrating a thermistor consists of measuring its resistance at various temperatures and fitting this measured data to the Steinhart Hart equation The resulting coefficients C1 C2 and C3 effectively describe the thermistor for a specific temperature range For more information about the Steinhart Hart equation see ILX Lightwave Application Note 4 Thermistor Calibration and the Steinhart Hart Equation To measure the precise temperature of a load you must use a calibrated sensor For example when using a thermistor enter its Steinhart Hart coefficients C1 C2 and C3 into the temperature controller If the exact temperature is not crucial within 1 5 C and you are using a 10 KQ thermistor use the default constants provided by the LDT 5910C and LDT 5940C Thermistor resistance changes with temperature The LDT 5910C and LDT 5940C supplies constant current either 10 pA or 100 pA through the thermistor so that a temperature change results in a voltage change across the thermistor This voltage change is sensed by the instrument and fed back to the control loop The supply current selection depends on the thermistor operating temperature range and the required temperature resolution A general rule of thumb for a 100 KQ thermistor is to use the 10 pA range for temperatures between 30 C and 30 C and for 10 kQ thermistor the 100 pA range for temperatures between 10 C to 70 C Select the the
95. rmistor sense current of 10 pA or 100 pA in the front panel PARAM menu Using 10 pA as the thermistor current allows you to use a maximum thermistor resistance of 450 kQ The 100 pA setting allows a 45 kO maximum The LDT 5910C and LDT 5940C have the ability to select the sensor current range based on the resistance of the measurement and will automatically switch between the 10 pA or 100 pA Thermistor auto range can be selected under the SENSOR menu in PARAM To ensure proper thermistor current and thermistor selection certain principles must be considered e To ensure measurement accuracy the voltage across the thermistor must not exceed DV e To improve control responsiveness and accuracy the thermistor voltage variations that result when the load temperature deviates from the setpoint must be as large as possible The importance of maximizing voltage variation is shown in Figure 2 3 which shows resistance as a function of temperature for a thermistor The values shown were selected for simplicity in this example and may not reflect real thermistor values In the example shown in Figure 2 3 the thermistor resistance is 25 kQ at 20 C Deviations of one degree at 20 C cause a resistance variation of about 2 kQ If using the 10 pA setting there is 20 mV of feedback to the control circuit Using the 100 pA setting provides 200 mV of feedback The larger feedback signal means that the temperature is more precisely controlled April 201
96. s PSC state Memory contents associated with SAV Or GOIN S 48 LDT 5910C and LDT 5940C SAV lt bin gt Save Description Parameters Notes Examples Saves the current instrument configuration to non volatile memory A value from 1 10 The SAV operation saves the contents of everything affected by the RST command It is not necessary to save the current setup for next power on The current setup is automatically stored and recall at next power on Use RCL lt bin gt to restore the saved configuration SAV 3 The current instrument configuration is stored in memory bin 3 SRE lt integer gt Service Request Enable Command Description Parameters Notes Examples Sets the service request enable register bits A value in the range of 0 to 255 The integer sent as a parameter when expressed in binary format each bit represents a bit in the service request enable register A bit value of one indicates an enabled condition A bit value of zero indicates a disabled condition Bit 6 will be ignored Setting the service request enable register allows the programmer to select which summary messages in the status byte register may cause service requests Each bit in the service request enable register corresponds to a bit in the status byte register A service request is generated when a bit in either the service request enable register or the status byte register transitions from zero to one and the corr
97. s for USB Test and Measurement Class USBTMC is a protocol built on top of USB that allows GPIB like communication with USB devices From the user s point of view the USB device behaves just like a GPIB device For example you can use VISA Write to send the IDN Query and use VISA Read to get the response The USBTMC protocol supports service request triggers and other GPIB specific operations USBTMC allows instrument manufacturers to upgrade the physical layer from GPIB to USB while maintaining software compatibility with existing software such as instrument drivers and any application that uses VISA April 2012 28 LDT 5910C and LDT 5940C Changing Between Local and Remote Operation Sending a command over the GPIB or USB bus automatically puts the instrument in Remote mode The Remote indicator identifies when the controller is in remote operation mode When the instrument is in Remote mode all front panel controls are disabled except for the Local button Pressing the Local button returns the instrument to Local control mode unless the Local Lockout state has been activated by the host computer Local Lockout disables all front panel controls including the Local button until this condition is changed by the host computer When the instrument is placed in Local Lockout Mode by the host computer the Remote indicator will light on the VFD display GPIB vs USB Communication When using the USB interface the remote GPIB command set is fully op
98. t ILX Lightwave IC Current sensor value is not changing Insure the 4 wire sensor voltage measurement pins 1 and on the LDT 5940C 2 are not connected to the sensor Inaccurate sensor TEC voltage or TEC Insure the 4 wire TEC sensor connections pins 7 and 8 are current measurement on the LDT connected and the cable resistance is set to zero For 5940C thermistor or RTD sensors insure the 4 wire sensor connections pins 1 and 2 are connected The instrument reads Internal Error code 516 is the internal communication error indication Communication Error that the LDT 5910C or LDT 5940C is not functioning correctly The instrument must be returned to ILX Lightwave if this error occurs No response from a remote command Check that a GPIB or USB A B cable from the system and the RMT indicator is off controller is connected to the LDT 5910C and LDT 5940C If you are using GPIB the cable should be less than 3 meters 10 feet long Press PARAM until the GPIB address is displayed If it is not correct change it by pressing SET and then using the ADJUST knob until you see the correct address Check that your controlling software is sending commands to the correct GPIB address or with the correct terminating character Check that no two devices are set to the same GPIB address Make sure that there are less than 15 devices on the bus Check that total GPIB cable length is less than 20 meters 65 feet Check the conf
99. t Summary 3 TEC Cond Summary 4 Message Available 5 Event Status Summary 6 Service Request Master Status Summary 7 Error Available Service Request Enable Register SRE lt nrf gt SRE STB A response of 200 specifies that the TEC condition summary master status summary and error available bits are enabled Performs an internal self test and then reports results None Response 0 test completed with no errors Response 1 test completed with errors This is a synchronous command and will block other commands from execution until it has completed TST A response of 0 means tests completed without errors 50 LDT 5910C and LDT 5940C WA Wait to Continue Description Prevents the instrument from executing any further commands until all pending operations are complete Parameters None Notes This command can be used to make the instrument wait until an operation is complete before continuing Care should be taken to set the time out appropriately for use with the WAI command After this command is sent the instrument may block subsequent commands waiting for the input queue to empty Examples OUTPUT ON WAI MEAS T The temperature measurement will occur after the output is on April 2012 51 LDT 5910C and LDT 5940C The following pages contain a reference for device dependent commands of the LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers ANAloginput ON OFF 1
100. the Event Register is queried or the LDT 5910C or LDT 5940C is powered off Conditions reflect the current state of the instrument and therefore may change many times during operation Querying a Condition Register does not change its contents Figure 3 5 shows the status reporting scheme of the LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers Each of the registers which may be accessed by a command or query has the appropriate command or query written above or below the register representation For example the TEC Condition Register may be queried via the COND or STATus query The condition or event registers are logically ANDed with their respective enable registers These bits are then logically ORed to form a summary message in the status byte for that particular register April 2012 35 LDT 5910C and LDT 5940C Standard Event Status Register ESR 0 Operation Complete 1 Request Control 2 Query Error 3 Device Dependent Error 4 Execution Error 5 Command Error 6 User Request 7 Power On Standard Event Status Enable Register ESE lt nrf gt ESE Queue Not Empty T D i 1 1 1 i i i H H H i H D D D D 1 1 Status Byte Register STB D MA 1 N A 2 TEC Event Summary 3 TEC Cond Summary 4 Message Available 5 Event Status Summary 6 Service Request 7 Error Available Service Request Enable Register
101. tput connector of the LDT 5910C pins 7 and 8 or the 25 pin output connector of the LDT 5940C pins 14 and 15 4 Enter the sensor calibration mode by pushing the parameter RECALL and display SELECT buttons at the same time 5 Press and hold in the SET button and turn the ADJUST knob until the display indicates the same resistance you recorded for the 1 2 KQ or 200 Q metal film resistor 6 Release the SET button and wait for the 7 segment display to exit the calibration mode and reflect the entered sensor resistance setpoint Once the self calibration is completed the calibration constants will be stored to the non volatile memory and the display will return to its previous state ITE Current Calibration The following procedure calibrates the ITE constant current source for both polarities of current During this procedure the ITE current is driven to two pre determined values When each of these values is reached and is stable the user enters the actual value of the current as measured by an external DMM The LDT 5910C and LDT 5940C Thermoelectric Temperature Controllers then automatically calibrates the TEC current source and limits 1 Connect a1 Q 25 W resistor across the TEC output terminals of the LDT 5910C pins 1 and 3 of the 15 pin connector or the LDT 5940C pins 9 10 21 22 and 12 13 24 25 of the 25 pin connector 2 Enter the ITE calibration mode by pushing the parameter RECALL and display LEFT buttons simultaneously
102. uses a flexible representation for numeric parameters integer floating point or engineering scientific notation There are no default values for omitted parameters Some device dependent GPIB commands are compound commands in which the first mnemonic opens a path to a set of commands relating to that path The second mnemonic then defines the actual command Following are examples of invalid syntax command strings that will produce errors Table 3 6 Invalid Syntax Command Strings COMMAND COMMENT LIM ITE HI Missing colon OUT ON INC Missing semicolon INC command generates an error DIS Space not allowed before question mark DIS command expected T5 4 dis Space missing between T command and the parameter value 5 4 April 2012 33 LDT 5910C and LDT 5940C IEEE 488 2 Common Commands The IEEE 488 2 Common Commands and Queries are distinguished by the which begins each mnemonic The diagrams below show the syntax structure for common commands common command queries and common commands with numeric data required Or Oe Common Command Common Command Query decimal lt white space gt numeric program data gt Common Command with Numeric Data Figure 3 4 Common Command Diagrams Numeric data is required with PSC 1 on 0 off RCL 0 10 see front panel RECALL function SAV 1 10 see front panel STORE function and ESE 0 255 see Figure 3 2 GPIB c
103. vice requests PSC Queries the Power On Status Clear Flag RCL lt integer gt Used to recall a stored setup configuration RST Forces a device reset SAV lt integer gt Saves the current setup configuration SRE lt integer gt Ee Register bits to allow generation of user SRE Returns the current contents of the Service Request Enable Register STB Returns the current contents of the Status Byte Register TST Initiates an internal self test and returns a response when complete WAT Se executing any further commands until the No Operation Pending flag is April 2012 41 LDT 5910C and LDT 5940C Table 4 2 Instrument Specific Command Summary Reference List NAME FUNCTION Determines whether temperature modulation is EE CECR enabled via the analog in BNC CABLER lt ohms gt Output Cable Resistance setting COND Queries device conditions CONST ICI lt slope gt lt offset gt Gain and Offset for temperature to current transducer CONST ICI SLOPe lt pA K gt Slope only control CONST ICI OFFSet lt pA gt Offset only control CONST ICV lt slope gt lt offset gt Gain and Offset for temperature to voltage transducer CONST ICV SLOPe lt mV K gt Slope only control CONST ICV OFFSet lt mvV gt Offset only control CONST RTD lt A gt lt B gt lt C gt lt Ro gt Callendar Van Dusen constants for RTD measurement CONST RTD A B C RO lt va
104. warranty vi Customer service contact information Safety Information and the Manual Throughout this manual you will see the words Caution and Warning indicating potentially dangerous or hazardous situations which if not avoided could result in death serious or minor injury or damage to the product Specifically A CAUTION Caution indicates a potentially hazardous situation which can result in minor or moderate injury or damage to the product or equipment M warnine Warning indicates a potentially dangerous situation which can result in serious injury or death 2 WARNING Visible and or invisible laser radiation Avoid direct exposure to the beam General Safety Considerations If any of the following conditions exist or are even suspected do not use the instrument until safe operation can be verified by trained service personnel Visible damage Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions If necessary return the instrument to ILX Lightwave or authorized local ILX Lightwave distributor for service or repair to ensure that safety features are maintained All instruments returned to ILX Lightwave are required to have a Return Authorization Number assigned by an official representative of ILX Lightwave Corporation See Returning an Instrument for more information February 2012 v LDT 5910C and LDT 5940C Safety Symbols This secti
105. with lt CR gt lt NL gt lt END gt Carriage Return New Line EOI A carriage return lt CR gt is read as white space The LDT 5910C and LDT 5940C terminates its responses with lt CR gt lt NL gt lt END gt unless the TERM command is used to change it If problems are encountered with GPIB communications the terminator string can sometimes be the cause Refer to the computer s GPIB controller manual for information on configuring its terminator string Command Separators More than one command may be placed in the same command string if each command is separated by a semicolon The semicolon can be preceded by one or more spaces For example DISPLAY ON IDN MODE DISPLAY ON IDN MODE April 2012 30 LDT 5910C and LDT 5940C Parameters Some commands require a parameter The parameter must be separated by at least one white space The syntax symbol lt nrf value gt refers to the flexible numeric representation defined by the GPIB standard It means that numbers may be represented in integer or floating point form or in engineering scientific notation The IEEE 488 2 standard uses the names NR1 NR2 and NR3 respectively to denote integer floating point and scientific notation For example the number twenty may be represented by any of the following ASCII strings Table 3 4 Parameters NR1 Integer 20 20 NR2 Floating Point 20 0 20 0 Sere f 2 0E 1 2 0E 1 NR3 Scient
106. with higher P and D coefficients will take more time to tune than those with lower P and D coefficients April 2012 82 LDT 5910C and LDT 5940C
107. xamples MEAS SEN response 0 0001323 means the measured sensor value is 132 3 pA if instrument sensor is set for ICI MEASure Temp Description Measured sensor temperature Response Degrees Temperature in C Notes Relies on having the proper sensor selected and the appropriate constants Examples MEAS T response 45 6 means the measured temperature is 45 6 C MEASure VTE Description Measured TEC voltage Response Volts TEC Voltage in volts Notes Use the CABLER command to configure the cable resistance for the most accurate measurements Examples MEAS VTE response 4 2 means the measured output voltage is 4 2 V MODE T SENSOR ITE MODE Description Configures the control mode of operation Parameters T Temperature control mode Controls to a temperature setpoint using the selected sensor SENSOR Sensor value control mode Controls to a Resistance Current or Voltage depending on the sensor selected ITE Continuous current mode or open loop Directly controls current to the TEC Notes The SET ITE SET SENsor and SET Temp are used to control the setpoint LIMit SENsor and LIMit Temp are active only in their respective modes LIMit ITE is active in all modes of operation Reset Value T Examples MODE response T means that the controller is in constant temperature control mode OUTPut ON OFF 1 0 OUTPut Description Controls whether the output is enabled or not Parameters ON 1 Turns the

User`s Guide - Newport Corporation

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