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Lake Shore 350, User Manual

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Lake Shore 350 User Manual Download Page 29

  

2.3.1   Dilution Refrigerator Terminology       

15

 

                                                        

   

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www.lakeshore.com

Chapter 2: Cooling System Design 

and Temperature Control

2.1  General

Selecting the proper cryostat or cooling source is probably the most important deci-
sion in designing a temperature control system. The cooling source defines minimum 
temperature, cool-down time, and cooling power. Information on choosing a cooling 
source is beyond the scope of this manual. This chapter provides information on how 
to get the best temperature measurement and control from cooling sources with 
proper setup including sensor and heater installation.

2.2  Useful 
Temperature 
Range

The lowest temperature at which the Model 350 can make useful temperature mea-
surements is difficult to define. In a practical sense, the instrument is limited by its 
need for four electrically conductive leads to be attached to a sensor and that sensor 
attached to a cold surface. Heat conduction and noise pick-up in the sensor leads 
limit the lowest temperature that can be achieved in this environment, even before 
an instrument is attached. The diminishing thermal contact between the sensor and 
cold surface at low temperatures exaggerate the problem. In general, the Model 350 
was designed for measurements down to 100 mK. 

2.3  Cryogenic 
Cooling System 
Terminology

There are many different cryogenic cooling systems used in laboratories today and it 
would be impossible to describe them all in this manual. This section briefly illus-
trates the three most common cooling systems capable of reaching temperatures 
below 1 K. This is an attempt to demonstrate how the Model 350 can be integrated 
into these systems for resistance measurement, temperature measurement and tem-
perature control. It is hoped that from these examples, those knowledgeable in cryo-
genic techniques will become familiar with the terminology used throughout this 
manual and the intended operation of many of the instrument features.

2.3.1 Dilution 
Refrigerator 
Terminology

Dilution refrigerators remain the workhorse of low temperature research down to 
approximately 5 mK to 10 mK. So many variations of factory and home built units 
exist that it is unlikely that any two are identical. FIGURE 2-1  illustrates only the 
most basic features.

Summary of Contents for 350

Page 1: ...onship whatsoever has existed which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics Inc in these developments Methods and appa ratus disclosed herein may be subject to U S Patents existing or applied for Lake Shore Cryotronics Inc reserves the right to add improve modify or withdraw functions design modifications or products at any time without notice Lake Shore shall ...

Page 2: ...implied including but not limited to the implied warranties or conditions of merchantability and fitness for a particular purpose Specifically except as provided herein LakeShore undertakes no responsibility that the products will be fit for any particular purpose for which you may be buying the Products Any implied warranty is limited in duration to the warranty period No oral or written informat...

Page 3: ...y for damage or errors incurred as result of any changes made to the firmware FIRMWARE LICENSE AGREEMENT continued Under the terms of this agreement you may only use the Model 350 firmwareasphysically installedinthe instrument Archivalcopiesare strictly forbidden You may not decompile disassemble or reverse engineer the firmware If you suspect there are problems with the firmware return the instru...

Page 4: ...Model 350 Temperature Controller ...

Page 5: ...ttached If the installation and operating instructions in the User s Manual are followed there should be no degradation in EMC performance This instrument is not intended for use in close proximity to RF Transmitters such as two way radios and cell phones Exposure to RF interference greater than that found in a typical laboratory environment may disturb the sensitive measurement circuitry of the i...

Page 6: ......

Page 7: ...Control 9 1 6 4 1 Heater Outputs Outputs 1 and 2 9 1 6 4 2 Analog Outputs Outputs 3 and 4 10 1 6 5 Front Panel 10 1 6 6 Interface 11 1 6 7 General 11 1 7 Safety Summary and Symbols 12 Chapter 2 Cooling System Design and Temperature Control 2 1 General 15 2 2 Useful Temperature Range 15 2 3 Cryogenic Cooling System Terminology 15 2 3 1 Dilution Refrigerator Terminology 15 2 3 2 3He Cryostat 17 2 4 ...

Page 8: ...r Installation 30 2 10 1 Mounting Materials 31 2 10 2 Sensor Location 31 2 10 3 Thermal Conductivity 31 2 10 4 Contact Area 31 2 10 5 Contact Pressure 31 2 10 6 Lead Wire 32 2 10 7 Lead Soldering 32 2 10 8 Thermal Anchoring Leads 33 2 10 9 Thermal Radiation 33 2 10 10 Resistor Self Heating Versus Excitation 33 2 11 Heater Selection and Installation 34 2 11 1 Heater Resistance and Power 34 2 11 1 1...

Page 9: ...uple Model 3060 51 3 5 9 1 Sensor Input Terminals 51 3 5 9 2 Thermocouple Installation 52 3 5 9 3 Grounding and Shielding 52 3 6 Heater Output Setup 52 3 6 1 Heater Output Description 52 3 6 1 1 Output 1 53 3 6 1 2 Output 2 53 3 6 2 Heater Output Connectors 53 3 6 3 Heater Output Wiring 54 3 6 4 Heater Output Noise 54 3 6 5 Powering Outputs 3 and 4 Using an External Power Supply 54 3 6 5 1 Choosin...

Page 10: ...t 74 4 4 12 Preferred Units 74 4 4 13 Max Min 74 4 5 Output and Control Setup 74 4 5 1 Heater Outputs 75 4 5 1 1 Max Current and Heater Resistance Output 1 Only 75 4 5 1 1 1 User Max Current 75 4 5 1 2 Power Up Enable 76 4 5 1 3 Heater Out Display 77 4 5 1 4 Output Modes 77 4 5 1 4 1 Closed Loop PID Mode 77 4 5 1 4 2 Zone Mode 77 4 5 1 4 3 Open Loop Mode 78 4 5 1 5 Control Parameters 78 4 5 1 5 1 ...

Page 11: ...1 General 105 6 2 IEEE 488 Interface 105 6 2 1 Changing IEEE 488 Interface Parameters 106 6 2 2 Remote Local Operation 106 6 2 3 IEEE 488 2 Command Structure 106 6 2 3 1 Bus Control Commands 106 6 2 3 2 Common Commands 107 6 2 3 3 Device Specific Commands 107 6 2 3 4 Message Strings 107 6 2 4 Status System Overview 108 6 2 4 1 Condition Registers 108 6 2 4 2 Event Registers 108 6 2 4 3 Enable Regi...

Page 12: ... Viewing Ethernet Configuration 125 6 4 2 1 LAN Status 125 6 4 2 2 MAC Address 126 6 4 2 3 Viewing Network Configuration Parameters and DNS Parameters 126 6 4 3 TCP Socket Communication 126 6 4 4 Embedded Web Interface 127 6 4 4 1 Connecting to the Web Interface 127 6 4 4 2 Web Pages 127 6 5 Utilities 129 6 5 1 Embedded Curve Handler 130 6 5 2 Ethernet Firmware Updater 131 6 5 3 Instrument Configu...

Page 13: ... Calibration Procedure 169 8 10 Rear Panel Connector Definition 170 8 10 1 IEEE 488 Interface Connector 172 8 11 Electrostatic Discharge 173 8 11 1 Identification of Electrostatic Discharge Sensitive Components 173 8 11 2 Handling Electrostatic Discharge Sensitive Components 174 8 12 Enclosure Top Remove and Replace Procedure 174 8 13 Record of Updates Made to the Firmware 176 8 14 Technical Inqui...

Page 14: ...Model 350 Temperature Controller ...

Page 15: ...y with minimal thermal impact or precise temperature control in high magnetic fields or depend able measurement in radiation environments the new Model 350 controller matched with Lake Shore s industry leading Cernox sensors provides a cryogenic solution that s demonstrably best in class The patented noise reduction input circuitry of the Model 350 is just one reason why this controller works so w...

Page 16: ...grounding inconsistencies making it easier to achieve reliable measurements at ultra low temperatures With the ability to label each sensor input channel with a customized name it s also easy to identify the mea sured values being displayed 1 2 2 Three Option Cards for More Inputs and a Wider Range of Applications Field installable input option cards can expand your sensor selection to include sil...

Page 17: ... assigned to any alarm or operated manually Choosing appropriate PID control settings for a closed loop sys tem can be tedious but the Model 350 provides the temperature control loop auto tuning feature to simplify the process It s an automated process that measures system characteristics and computes setting values for P I and D for you Once PID tuning parameters are chosen for a given setpoint t...

Page 18: ...onal InputTypeswithOption Cards The field installable input option cards add additional input types The Model 3060 adds thermocouple capability The Model 3061 adds capacitance sensor inputs The Model 3062 adds 4 Cernox platinum diode input channels While the option cards can be easily removed it is not necessary as the standard inputs remain functional when the options are not being used 1 5 Senso...

Page 19: ...T 111 14 K to 673 K T 40 K B 2 5 T Rhodium iron RF 800 4 1 4 K to 500 K T 77 K B 8 T Diodes 3062 Silicon Diode DT 670 SD 1 4 K to 500 K T 60 K B 3 T Silicon Diode DT 670E BR 30 K to 500 K T 60 K B 3 T Silicon Diode DT 414 1 4 K to 375 K T 60 K B 3 T Silicon Diode DT 421 1 4 K to 325 K T 60 K B 3 T Silicon Diode DT 470 SD 1 4 K to 500 K T 60 K B 3 T Silicon Diode DT 471 SD 10 K to 500 K T 60 K B 3 ...

Page 20: ... 40 0 K 3 41 K 79 5 µK 284 µK 1 5 mK 7 5 mK 88 mK 908 µK 2 7 mK 13 7 mK 65 4 mK 727 mK 4 9 mK 6 7 mK 18 mK 69 mK 803 mK 159 µK 568 µK 3 0 mK 15 0 mK 176 mK Platinum RTD 500 Full Scale PT 103 with 14J calibration 30 77 300 500 3 66 20 38 110 35 185 668 0 191 K 0 423 K 0 387 K 0 378 K 0 5 mK 0 7 mK 7 8 mK 7 9 mK 22 mK 34 mK 140 mK 223 mK 31 mK 44 mK 164 mK 274 mK 1 0 mK 1 4 mK 15 5 mK 15 9 mK Silico...

Page 21: ...m 0 001 of rdg C 6 m 0 to 100 10 µA9 1 m 10 m 0 1 0 04 of rdg 1 m 0 001 of rdg C 20 m 0 to 300 3µA9 1 m 30 m 0 1 0 04 of rdg 3 m 0 001 of rdg C 60 m 0 to 1 k 1 µA9 10 m 100 m 1 0 0 04 of rdg 10 m 0 001 of rdg C 200 m 0 to 3 k 300 nA9 10 m 300 m 2 0 0 04 of rdg 30 m 0 001 of rdg C 600 m 0 to 10 k 100 nA9 100 m 1 10 0 0 04 of rdg 100 m 0 001 of rdg C 2 0 to 30 k 30 nA9 100 m 3 30 0 04 of rdg 300 m 0...

Page 22: ...ocouple capacitance and diode inputs require an optional input card that can be installed in the field Once installed the additional inputs can be selected from the front panel like any other input type Supported option cards Thermocouple 3060 capacitance 3061 or scanner 3062 Option slots 1 Isolation Sensor inputs optically isolated from other circuits but not each other A D resolution 24 bit Inpu...

Page 23: ...etting 50 setting Type Variable DC current source D A resolution 16 bit Max power 75 W 50 W Max current 1 732 A 1 A Compliance voltage min 50 V 50 V Heater load for max power 25 50 Heater load range 10 to 100 Ranges 5 decade steps in power Heater noise 1 2 µA RMS dominated by line frequency and its harmonics Grounding Output referenced to chassis ground Heater connector Dual banana Safety limits C...

Page 24: ... 5 Front Panel Display 8 lineby40 character 240 64pixel graphicLCDdisplaymodulewith LED backlight Number of reading displays 1 to 8 Display units K C V mV Reading source Temperature sensor units max and min Display update rate 2 rdg s Temperature display resolution 0 00001 from 0 to 9 99999 0 0001 from 10 to 99 9999 0 001 from 100 to 999 999 0 01 above 1000 Sensor units display resolution Sensor d...

Page 25: ... contact Lake Shore for availability Alarms Number 4 high and low for each input Data source Temperature or sensor units Settings Source high setpoint low setpoint deadband latching or non latching audible on off and visible on off Actuators Display annunciator beeper and relays Relays Number 2 Contacts Normally open NO normally closed NC and common C Contact rating 30 VDC at 3 A Operation Activat...

Page 26: ... cable Plug the power cable into an approved 3 contact electrical outlet or use a 3 contact adapter with the grounding wire green firmly connected to an electrical ground safety ground at the power outlet The power jack and mating plug of the power cable meet Underwriters Laboratories UL and International Electrotechnical Commission IEC safety standards Ventilation The instrument has ventilation h...

Page 27: ... shock background color yellow symbol and outline black CAUTION or WARNING See instrument documentation background color yellow symbol and outline black Off supply On supply Frame or chassis terminal Protective conductor terminal Earth ground terminal 3 Three phase alternating current power line Alternating or direct current power line Alternating current power line 1 7 SafetySummaryandSymbols 13 ...

Page 28: ...14 cHAPTER 1 Introduction Model 350 Temperature Controller ...

Page 29: ...nvironment even before an instrument is attached The diminishing thermal contact between the sensor and cold surface at low temperatures exaggerate the problem In general the Model 350 was designed for measurements down to 100 mK 2 3 Cryogenic Cooling System Terminology There are many different cryogenic cooling systems used in laboratories today and it would be impossible to describe them all in ...

Page 30: ...nd acts as a radiation shield for refrigeration components Vacuum space insulates refrigeration components and provides a clear workspace 1 K pot 4Heevaporator pumped reservoir of 4He maintained at 1 K Used in the process of condensing 3He rich gas returning from pumping system Also used as a heat sink for measurement leads Good location for a temperature sensor for cool down moni toring and troub...

Page 31: ...trol Load sample holder end of the mixing chamber where experiments can take place May either be part of or attached to the mixing chamber and it is often designed for a unique purpose Requires a separate temperature sensor if its temperature is differ ent from the mixing chamber 2 3 2 3He Cryostat 3He cryostats are the least complex systems capable of reaching temperatures down to 300 mK Even at ...

Page 32: ... Operation This section explains sensor resistance measurements excitation modes resistance ranges and measurement circuits It also explains measurement speed and filtering for the Model 350 2 4 1SensorResistance Measurement The Model 350 uses a four lead AC square wave measurement technique to achieve its accuracy with current excitations down to 10 nA The Model 350 uses current excitation becaus...

Page 33: ...pecifies a fixed resistance range which defines the excitation current The instrument selects the appropriate voltage gain for the selected resistance range The instrument keeps the current and resistance range constant when a manual range is selected In this mode it is easier to calculate the actual power in the sensor P I2 R because the true current is displayed alongside the resistance range in...

Page 34: ... ground it is necessary to prevent ground loops that couple line frequency noise into the measurement A ground loop is created when measurement common is tied to Earth ground at more than one point The isolation of the instrument breaks the loop between the instrument power cord and the measurement common No loop is formed if measurement common is tied to Earth ground at only one point Loops are a...

Page 35: ...with a 3dB frequency of 16 Hz Additional filtering is done in the instrument firmware as a linear average The input hardware settles about 100 milliseconds after a temperature sensor resis tance change if no range change is required When the firmware filter is turned on that filter settling time must be added to the hardware settling time to approximate overall settling The firmware filter can be ...

Page 36: ...rcuits were carefully chosen to maintain good noise performance over a wide resistance range without generating high leakage currents that could self heat sensors Instrument noise specified in TABLE 1 3 is dominated by amplifier noise When high resistance sensors 10 k are measured the noise measured becomes dominated by the thermal noise of the resistance The thermal noise of a sensor drops as the...

Page 37: ...se to allow its internal temperature to stabilize Warm up is an exag gerated form of temperature drift because the temperature change inside the enclo sure is larger and faster than would be experienced in a laboratory setting Temperature drift change in reading with change in ambient temperature is small in the Model 350 and seldom a significant factor in absolute accuracy Measurement repeatabili...

Page 38: ...re properly heat sunk and noise is effectively shielded there can be a temperature error in sensor measurements that comes from within Self heating will occur when the power from excitation current is large enough to warm the sensor above the temperature of its surroundings The effect is most noticeable at low tem peratures because the thermal conduction becomes very poor The self heating error ca...

Page 39: ...10 at 100 mK with electronic resistance Re equal to 21 389 the thermal resistance Rt is 2E 9 see Appendix E Temperature Measurement System in the Temperature Control Catolog At 10 nA excitation current the typical self heating error would be TSH I2ReRt 10 nA2 21 389 2E 9 4 3mK Instrument electronic accuracy can be calculated from the specifications listed in TABLE 1 3 The accuracy depends on the r...

Page 40: ... so if self heating can be accurately calculated or measured the self heating offset can be calibrated out The optimum excitation is a balance between minimizing self heating errors low excitation and maximizing resolution and accuracy large excitation TABLE 2 1 illustrates the tradeoffs that need to be made when selecting a sensor and excitation current Lowering excitation current can dramaticall...

Page 41: ...nt Measurement Resolution Sensitivity 5 TABLE 1 3 Input Specifications 6 Temperature Equivalent Instrument Accuracy Instrument Gain Accuracy Instrument Offset Accuracy Sensitivity 7 Temperature Control Catalog Appendix D Sensor Calibration Accuracies 8 Total Uncertainty Instrument Accuracy Sensor Uncertainty Self Heating Error To determine the optimal excitation current consider that self heating ...

Page 42: ... related to it Resolution accuracy noise floor and even control stability depend on sensitivity Many sensors have different sensitiv ities at different temperatures For example a platinum sensor has good sensitivity at higher temperatures but it has limited use below 30 K because its sensitivity drops sharply It is difficult to determine if a sensor has adequate sensitivity over the experi mental ...

Page 43: ...libration 2 point 77 K and 305 K 3 point 4 2 K 77 K and 305 K or 3 point 77 K 305 K and 480 K which is avail able for 400 Series silicon diodes and platinum sensors Good Sensors using standard curves Silicon diodes follow standard curves Platinum resistors follow standard curves Ruthenium oxide Rox resistors follow standard curves Thermocouples follow standard curves GaAlAs diode carbon glass Cern...

Page 44: ...mware 2 9 4 Curve Handler Lake Shore provides a software application called Curve Handler which makes loading temperature curves into the Model 350 a very simple process The program can copy curves from properly formatted files into the Model 350 user curve loca tions You can also use it to read curves from the Model 350 and save them to files Lake Shore calibrated sensors are provided with a CD c...

Page 45: ...control as discussed below 2 10 3 Thermal Conductivity The ability of heat to flow through a material is called thermal conductivity Good thermal conductivity is important in any part of a cryogenic system that is intended to be the same temperature Copper and aluminum are examples of metals that have good thermal conductivity while stainless steel does not Non metallic electrically insulating mat...

Page 46: ...e if it is present The wire used on the room temperature side of the vacuum boundary is not critical so copper cable is normally used Typical sensor installation in a mechanical refrigerator Vacuum shroud Vacuum space Radiation shield Second stage and sample holder Thermal anchor bobbin Cryogenic wire small diameter large AWG To room temperature Refrigerator first stage Sensor Thermal anchor bobbi...

Page 47: ...space 2 10 10 Resistor Self Heating Versus Excitation Even after leads are properly heat sunk and noise is effectively shielded there can be a temperature error in resistance measurements that comes from within Self heating will occur when the power from excitation current is large enough to warm the resis tor above the temperature of its surroundings The effect is most noticeable at low temperatu...

Page 48: ...to provide large amounts of heat for controlling at higher temperatures or for war mup TABLE 2 3 provides the current and voltage limits for Output 1 as well as the resulting maximum power for Output 1 for the 25 and 50 settings using nominal heater load values Output 1 current and voltage limits with resulting max power 25 setting 25 heater 50 setting 50 heater Output 1 Current limit 1 732 A 1 A ...

Page 49: ... output current for Output 1 section 4 5 1 1 which when set appropri ately will help protect the heater from being over heated 2 11 1 4 Outputs 3 and 4 Outputs 3 and 4 are analog voltage outputs that can be used for various purposes including closed loop PID control and still heater applications For more information on these outputs refer to section 3 6 2 11 2 Heater Location For best temperature ...

Page 50: ...ductivity causes thermal gradients that reduce accuracy and also cause thermal lag that make it difficult for controllers to do their job Thermal lag is the time it takes for a change in heating or cooling power to propagate through the load and get to the feedback sensor Because the feedback sensor is the only thing that lets the controller know what is happening in the system slow information to...

Page 51: ...ul may make it necessary to retune the control loop more often 2 13 PID Control For closed loop operation the Model 350 temperature controller uses an algorithm called PID control The control equation for the PID algorithm has three variable terms proportional P integral I and derivative D See FIGURE 2 4 Changing these variables for best control of a system is called tuning The PID equation in the...

Page 52: ...setpoint changes quickly reducing the time it takes for temperature to reach the setpoint It can also see the error decreasing rapidly when the temperature nears the setpoint and reduce the output for less overshoot The derivative term can be useful in fast changing systems but it is often turned off during steady state con trol because it reacts too strongly to small disturbances The derivative s...

Page 53: ...Examples of PID control 2 13 4 ManualOutput 39 www lakeshore com FIGURE 2 4 ...

Page 54: ...ad warms up to room temperature Do not leave the system unattended the heater may have to be turned off manually to prevent overheating If the load never reaches room tempera ture some adjustment may be needed in heater resistance or load The list of heater range versus load temperature is a good reference for selecting the proper heater range It is common for systems to require two or more heater...

Page 55: ...0 control algorithm to gradually eliminate the difference in tem perature by integrating the error over time See FIGURE 2 4 d An integral setting that is too low causes the load to take too long to reach the setpoint An integral setting that is too high creates instability and can cause the load temperature to oscillate 1 Begin this part of the tuning process with the system controlling in proport...

Page 56: ...he current stage of the process such as Stage 3 of 7 If the tuning process completes successfully then the message is removed and the new PID parameters are configured If the algorithm fails the mes sage stops blinking to indicate that it is no longer processing and a failure message appears to indicate which stage of the process failed There are situations where Autotune is not the answer The alg...

Page 57: ...ate heat pump is a device that takes advantage of the Peltier effect When a DC current is applied to the device heat is transferred from one side of the device to the other Heat can be transferred in either direction by reversing the polarity of the current Thermo electric devices are well suited for controlling temperatures near room temperature since they have both heating and cooling capabiliti...

Page 58: ...44 cHAPTER 2 Cooling System Design and Temperature Control Model 350 Temperature Controller ...

Page 59: ... each item on the packing list as it is unpacked Instruments themselves may be shipped as several parts The items included with the Model 350 are listed below Contact Lake Shore immediately if there is a shortage of parts or accessories Lake Shore is not responsible for any miss ing items if not notified within 60 days of shipment If the instrument must be returned for recalibration replacement or...

Page 60: ... 108 V 132 V 220 V 198 V 242 V 240 V 216 V 264 V AC line voltage is set at Lake Shore but it is good to verify that the AC line voltage indica tor in the fuse drawer window is appropriate before turning the instrument on The instrument may be damaged if turned on with the wrong voltage selected Also remove and verify that the proper fuse is installed before plugging in and turning on the instru me...

Page 61: ...asurements being taken with this instrument may necessi tate additional grounding including ground strapping of the instrument chassis In these cases the operators safety should remain the highest priority and low imped ance from the instrument chassis to safety ground should always be maintained 3 4 4 Power Switch The power switch is part of the line input assembly on the rear panel of the Model ...

Page 62: ...e chassis of the instrument or in the cooling system will defeat that isolation Grounding leads on more than one sensor prevents the sen sor excitation current sources from operating Shielding the sensor lead cable is important to keep external noise from entering the measurement A shield is most effective when it is near the measurement potential so the Model 350 offers a shield at measurement co...

Page 63: ...n nector contact resistance is unpredictable and changes with time and temperature Minimize interconnections when making two lead measurements Refer to FIGURE 3 5 for an image of a two lead sensor measurement 2 lead sensor measurement I V V I Lead resistance Lead resistance Sensor 3 5 6 Lowering Measurement Noise Good instrument hardware setup technique is one of the least expensive ways to reduce...

Page 64: ...d with the capacitance sensor input option card Capacitance inputs are not installed on the standard Model 350 but it can be added by purchasing the Model 3061 capacitance input option Refer to section 7 4 for installation of the Model 3061 The Model 3061 adds a capacitance input to the Model 350 appearing on the display as input D The card has separate voltage feedback and current excitation for ...

Page 65: ... 3 496 kHz excitation of the option card can interfere with the sensitive DC measure ments of the standard inputs Tightly twist the lead wires of each sensor and separate them from the leads from the other sensor Test any system for sensor interference before it is permanently sealed 3 5 9 Thermocouple Sensor Inputs Thermocouple Model 3060 The information in this section is for a Model 350 configu...

Page 66: ...room temperature compensation is difficult after the sensor is installed When possible keep a piece of scrap wire from each installation for future use D Thermocouples can be spot welded to the cryostat for goodthermal anchoring as long as the cryostat has a potential close to earth ground 3 5 9 3 Grounding and Shielding Care must be taken to minimize the amount of noise contributed by ground loop...

Page 67: ...wer up to 1 W provid ing stable control at very low temperatures It is limited to a maximum output current of 100 mA and a compliance voltage of at least 10 V but can be as high as approxi mately 13 V Output 2 also has five ranges each one decade lower in power than the last Refer to TABLE 3 3 for maximum current and power ratings into different heater resistances Heater resistance Heater Resistan...

Page 68: ...al noise The Model 350 was designed to generate as little noise as possible but even noise that is a small percentage of the output voltage or current can be too much when sensitive measurements are being made near by Heater output noise can be most detrimental when controlling at very low temperatures Heater Output 2 uses a fully linear power supply to minimize heater noise The switching power su...

Page 69: ...to prevent damage D Unipolar power supplies are designed to use a positive programming voltage and some can be damaged if the programming voltage is negative Be careful when wiring the system to maintain the correct polarity Also never set the control output of the Model350 to bipolar mode D Some power supplies can be damaged if there is a programming voltage present at their input when they are t...

Page 70: ...roportional to the ratio of resistors R1 to R2 Vout 10V x R1 R1 R2 It is also important to keep the sum of R1 R2 1000 or the Model 350 output may not reach the output voltage setting due to internal overload protection For a programming input range of 0 V to 5 V recom mended values are R1 R2 2000 For a programming input range of 0 V to 1 V recommended values are R1 500 R2 4500 Exact resistor value...

Page 71: ...le Input Setup Input A B C or D Room Compensation Off or On A B C D E Q Q Enter Menu navigation key Item Convention Explanation A Bold Typically the first word in the menu navigation is in bold type which indicates the first key you will need to press B Q The arrow indicates that the screen is advancing to the next screen In the menu navi gation the item that follows the arrow is the next item you...

Page 72: ...is play returns to the assigned Display Mode setting Press the same key again or press Escapebe fore the timeout period to return the display to the previous Display Mode setting Pressing and holding one of these keys for 3s causes the associated Input Display to become the new perma nent Display Mode setting indicated by an audible beep When the Model 3062 4 channel scanner option is installed pr...

Page 73: ...er entry or parameter selection You can also use this key to navigate up one level in a setting menu which exits the menu if at the top level Press and hold for 3 s to reset instrument parameters to factory default values N A Enter Press this key to accept a number entry or a parameter selection You can also use it to navi gate deeper into a menu setting screen Press and hold for 3 s to lock or un...

Page 74: ...hlighted parameter The type of setting mode depends on the type of parameter highlighted The possible setting modes are Number Entry Alpha Numeric Entry and Setting Selection Refer to the respective entry mode descriptions below During menu navigation press Escape Exit Menu to per form the Exit Menu function this will not cancel any setting changes D Number Entry allows you to enter number data us...

Page 75: ...Q Four Loop All Inputs Mode Custom Input A Input B Input C Input D Default Custom Interface Command DISPLAY 4 3 1 1 Four Loop Mode Four Loop mode provides a limited amount of information about each of the four sen sor inputs and the associated control loops Each quadrant of the display is dedicated to one sensor input and the associated loop if applicable The top line of each quad rant contains th...

Page 76: ... contains information related to the control loop that is using the sensor input provided in the top half of the display as its Control Input parameter Only the items applicable to the control loop will be displayed Specifi cally the number of the control loop output followed by the Output Mode setting is displayed The P I D Manual Output Setpoint and Heater Output information of the control loop ...

Page 77: ...y ModeQCustom Interface Command DISPLAY D Locations depending on the Number of Displays parameter there can be any where from two to eight display locations for displaying sensor readings The placement of a given display location on the front panel LCD depends on the Number of Displays setting FIGURE 4 5 Top to bottom Model 350 screen images showing 2 4 and 8 display locations D Number of Custom d...

Page 78: ...its 1 Input A Kelvin 2 Input B 3 Input C 4 Input D 5 Input A Sensor 6 Input B 7 Input C 8 Input D D Displayed Output in the Custom Display mode the bottom half of the display is dedicated for output and control loop information for one of the four outputs The source of this information depends on the output selected for the Displayed Output parameter If the selected output is configured as a contr...

Page 79: ...gative Temperature Coefficient NTC RTD NTC RTD Cernox 0 to 300 k 10 Ranges 10 nA to 1 mA decade steps in power autorange maintains 10 mV or 1mV depending on sensor exci tation setting Negative log K Cernox Carbon Glass Germanium Rox and Thermox Platinum RTD Rhodium Iron RTD Option 3062 only PTC RTD Platinum 0 to 10 k 7 ranges 100 nA to 1 mA decade steps in power autorange maintains 10 mV Positive ...

Page 80: ...nge provides 10 times less current and therefore 100 times less power into the sensor which may be required to significantly reduce the effects of self heating Current Reversal is also enabled by default in order to compensate for thermal EMF voltages Refer to section 4 4 4 for details on the Thermal EMF Compensation Current Reversal feature Refer to section 2 7 for details on self heating effects...

Page 81: ...oltages The first is external noise entering the measurement through the sensor leads which is discussed with sensor setup The second is the presence of thermal EMF voltages or thermocouple voltages in the lead wiring Thermal EMF voltages appear when there is a temperature gradient across a piece of voltage lead Thermal EMF voltages must exist because the sensor is almost never the same temperatur...

Page 82: ...tion Input SetupQInput C or D QSensor TypeQThermocouple Interface Command INTYPE 4 4 5 1 Internal Room Temperature Compensation Room temperature compensation is required to give accurate temperature measure ments with thermocouple sensors It corrects for the temperature difference between the instrument thermal block and the curve normalization temperature of 0 C An external ice bath is the most a...

Page 83: ... Press Enter to enter Num ber Entry mode Enter the true temperature that the thermocouple should read If input is shorted then enter the actual room temperature measured by the thermometer Press Enter to save the value 8 To verify calibration check that the temperature reading for the calibrated input matches the room temperature calibration setting value Any previous calibration can be cleared us...

Page 84: ...point to the present capacitance reading It is not necessary for the user to write down the capacitance value and en ter a new setpoint Control parameters P and I may need to be changed for stable control 4 4 7 4 Channel Scanner Input Setup Model 3062 Only When a Model 3062 4 Channel Scanner option is installed in the Model 350 4 addi tional channels D2 D3 D4 and D5 become available for use The ch...

Page 85: ...variety of temperature sensors manufactured by Lake Shore and other manufacturers After the appropriate sensor type is selected section 2 2 an appropriate curve may be selected The Model 350 can use curves from several sources Standard curves are preloaded with every instrument and num bered 1 to 20 User curves numbered 21 to 59 can be used when a sensor does not match a standard curve SoftCal cal...

Page 86: ...erved 19 Reserved 20 Reserved 21 59 User Curves No longer offered by Lake Shore Instrument may not support the sensor over its entire range Once the input is configured section 4 4 you may choose a temperature curve Any standard or user curve that matches the format of the sensor type configured for a given input will be available under the Curve parameter in the Input Setup menu for that input Yo...

Page 87: ...d the time it takes to get a new reading is increased if more than one scanner channel is enabled or a channel is configured for a range that requires a reduced update rate This reduction in update rate modifies the time constant of the filter The time constant of the filter can be derived using the formula TC T In N N 1 where TC is one time constant T is the update rate of the channel in seconds ...

Page 88: ...erred Units in all display modes except for the Custom display mode where each sensor location can be assigned specific display units Menu Navigation Input SetupQInput A B C or D QPreferred UnitsQ K C or Sensor 4 4 13 Max Min The Max Min feature captures and stores the highest Max and lowest Min reading taken since the last reset The Preferred Units parameter under the Input Setup menu determines ...

Page 89: ...Resistance setting to 25 for any resistance less than 50 or to 50 for any higher heater resistance The user max current setting is useful when using a non standard heater resistance value Refer to section 4 5 1 1 1 for more information on User Max Current TABLE 4 14 pro vides examples of different heater resistances and max current settings and the resulting maximum heater power The maximum heater...

Page 90: ...eater Resistance Max Current 10 25 30 40 50 100 1 732 A 430 W 75 W x x x x 1 667 A User 28 W 69 5 W 83 W x x x 1 414 A 20 W 50 W 60 W x x x 1 25 A User 15 W 39 W 46 W 62 5 W x x 1 A 10 W 25 W 30 W 40 W 50 W x 0 707 A 5 W 12 5 W 15 W 20 W 25 W x 0 5 A User 2 5 W 6 W 7 5 W 10 W 12 5 W 25 W Shaded black Max current too high for these resistances due to voltage compliance limit Bold Discrete options a...

Page 91: ...igation Output SetupQOutput 1 2 3 or 4 QOutput ModeQ Off Closed Loop PID Zone Open Loop Default Off Interface Command OUTMODE 4 5 1 4 1 Closed Loop PID Mode The Closed Loop PID mode is the most commonly used closed loop control mode for tightly controlling temperature using the heater outputs of the Model 350 In this mode the controller attempts to keep the load at exactly the user entered setpoin...

Page 92: ...access to these settings Refer to section 4 3 1 for details on configuring display modes Since there is no sensor feedback in open loop mode there is nothing to prevent the sys tem from being overheated We recommend using the Temperature Limit feature to help protect the system from overheating Refer to section 4 4 11 for temperature limits Menu Navigation Output SetupQOutput 1 2 3 or 4 QOutput Mo...

Page 93: ...example a reset number setting of 20 corresponds to a time constant of 50 s A system will normally take several time constants to settle into the setpoint The 50 s time constant if correct for the system being controlled would result in a system that stabilizes at a new setpoint in between 5 min and 10 min To set I first configure the front panel display to show the desired control loop infor mati...

Page 94: ...esired con trol loop information and then press Manual Output on the front panel A quick way to access the setting if the control loop information is not already being displayed is to press A B C or D on the front panel to temporarily display the control loop infor mation while the new setting is entered Refer to section 4 3 for details on configuring the front panel display When an output is conf...

Page 95: ...mperature Kelvin or Celsius or from temperature to Sensor the Model 350 uses the assigned temperature curve to convert the Setpoint to the new control units This provides minimal disruption in the control output if you change the Preferred Units parameter while the control loop is active Menu Navigation SetpointQ See note below Default 0 0000 K Interface Command SETP When controlling in temperatur...

Page 96: ...y press Enter This stops the ramp at the current setpoint but leaves the ramping function activated To continue the ramp enter a new setpoint Refer to sec tion 4 5 1 5 6 for details on setting the Setpoint parameter 4 5 1 5 8 Heater Range The Heater Range setting is used for turning a control output on as well as setting the output power range for the heater outputs All four outputs provide an Off...

Page 97: ...moelectric devices The Open Loop mode can be used to set the output to a specific constant value Refer to section 4 5 1 4 3 for details on Open Loop Mode The Warm Up Supply mode uses the output to drive the programming input for an external power supply for the purpose of rapidly warming a system to a user specified temperature The Monitor Out mode uses the output to provide a volt age proportiona...

Page 98: ... to oper ating the controller via the IEEE 488 Interface The keypad is disabled during remote operation except for the Remote Local key and the All Off key When in remote mode the Remote front panel LED will be illuminated When in local mode the Remote LED will not be illuminated Menu Navigation Remote Local LED On Remote mode LED Off Local mode 4 7 Locking and Unlocking the Keypad The keypad lock...

Page 99: ...ues are This mode is recommended for systems that have very long lag times or nonlinearity that prevents stable PI control Expect some overshoot or undershoot of the setpoint and stable temperature control below the setpoint value D Autotune PI sets values for both P and I parameters D is set to 0 This mode is recommended for stable control at a constant temperature It may take slightly longer to ...

Page 100: ... to Autotune or the new control parameters are causing instability in the control Use a smaller initial P value 6 Observing system response to setpointchangeusingnewcontrol parameters Control parameters are changed again based on observation This is the final stage of P only Autotuning System response is too slow to Autotune or the heater is too underpowered for the system to Autotune If not alrea...

Page 101: ...On the setpoint will begin ramping at the current setpoint Ramp Rate then once the setpoint crosses 100 K the control parameters from Zone 8 will be used The setpoint ramp will then continue toward 2 K at a rate of 20 K min until crossing 50 K when the control parameters from Zone 7 are loaded This pattern will continue until the final setpoint value of 2 K is reached or another setpoint is entere...

Page 102: ...Derivative 0 200 MHP Output 0 100 Ramp Rate 0 1 100 K min A C A Med A High A D A B A A Heater Range A Off A Low Control Input A Default Proportional 0 1 1000 Integral 0 1 1000 Derivative 0 200 MHP Output 0 100 Ramp Rate 0 1 100 K min A C A Med A High A D A B A A Heater Range A Off A Low Control Input A Default Proportional 0 1 1000 Integral 0 1 1000 Derivative 0 200 MHP Output 0 100 Ramp Rate 0 1 ...

Page 103: ...asing the temperature in the controlled system for example to bring a system to room temperature in order to change samples Refer to section 3 6 5 for information on using an external power supply for warm up supply mode The Control Input parameter determines which sensor is used for feedback in the Warm Up Supply mode Refer to section 4 5 1 5 for details on the Control Input parameter Once Warm U...

Page 104: ...ain applied to the output The Heater Range will never be automatically set to Off in this mode Menu Navigation Output SetupQOutput 3 or 4 QWarm Up ControlQ Auto Off Continuous Default Continuous Interface Command WARMUP 5 6 Monitor Out In Monitor Out mode the unpowered analog output 3 or 4 will track the assigned control input according to the scaling parameters you enter A common use for this fun...

Page 105: ... K will cause the analog output to correspond to the input temperature as shown in FIGURE 5 3 In this case if the actual reading was 50 K then the output would be at 0 V middle of the scale Analog output with polarity set to bipolar Bipolar 0 K 50 K 100 K 10 V 0 V 10 V Input Output If we set the Polarity parameter to Unipolar the output would be as shown in FIGURE 5 4 In this case if the actual re...

Page 106: ...udible parameter is set to On for an enabled alarm then the beeper inside the instrument will sound when the alarm activates The two relays on the Model 350 can also be tied to alarm functions as described in section 5 7 2 You may want to set the Visible parameter to Off if there is no need for showing the alarm state on the front panel for instance if you are using the alarm function to trig ger ...

Page 107: ...mactivated Lowalarmactivated Lowalarmsetpoint Temperaturereading Highalarmsetpoint Highalarmdeactivated 100K 95K 55K 50K Lowalarmdeactivated Deadband 5K Alarmlatchingoff To setup an alarm enter the Alarm Setup menu by pressing the Alarm key If a latching alarm has been activated you will be prompted with a Reset Alarm message Select No to enter the Alarm Setup menu Menu Navigation AlarmQInput A B ...

Page 108: ...th alarm operation set up alarms first The relays are rated for 30 VDC and 3 A Their terminals are in the detachable terminal block on the Model 350 rear panel In the Off mode the relay is un energized leaving the normally open NO contacts open and the normally closed NC contacts closed In the On mode the relay is ener gized so the NO contacts will be closed and the NC contacts will be open In the...

Page 109: ...elvin for platinum RTD sensors 10 K 0 001 Log K Log resistance vs kelvin for NTC resistive sensors 4 log 0 00001 log mV K Millivolts vs kelvin for thermocouple sensors 100 mV 0 0001 mV D Setpoint Limit limits the control setpoint to values less than or equal to this set ting A setpoint limit can be included with every curve Default is 375 K Enter a setting of 9999 K if no limit is needed D Tempera...

Page 110: ...erations There are five operations associated with front panel curve entry Edit curve View Curve Erase Curve Copy Curve and SoftCal as detailed below Front panel curve entry operations Operation Description Refer to section Edit Curve Edit Curve allows you to edit curves at any user curve location Stan dard curves cannot be changed 5 9 1 View Curve View Curve allows you to view any curve at any cu...

Page 111: ...red breakpoint number and press Enter The highlight moves to the sensor value of the selected pair 2 Use the Number Entry method to edit the value Refer to section 4 2 1 2 for details on the Number Entry method 3 Once the new sensor value is entered press Enter to highlight the temperature value 4 Use the Number Entry method to enter the new temperature value 5 Press Enter at this point to store t...

Page 112: ...he new value when you press Enter After editing adding or deleting all desired breakpoint pairs press Escape Exit Menu while the highlight is on a breakpoint number All breakpoint pair changes additions and deletions will be saved when exiting the menu When curve entry is complete you must assign the new curve to an input The Model 350 does not automatically assign the new curve to any input Refer...

Page 113: ...oose No to the confirmation message or press Escape Menu Navigation Curve EntryQErase Curve Q 21 59 Interface Command CRDEL 5 9 4 Copy Curve Temperature curves can be copied from one location inside the Model 350 to another This is a good way to make small changes to an existing curve Curve copy may also be necessary if you need the same curve with two different temperature limits or if you need t...

Page 114: ...racy and other measure ment errors can be significant to some users Calibration can be no better than user supplied data D Purchased Lake Shore sensors with SoftCal calibration include a set of calibra tion points in the calibration report The SoftCal calibration points are gener ated in a controlled calibration facility at Lake Shore for best accuracy The calibration points can be entered into th...

Page 115: ...y atmospheric pressure Use calibrated stan dard sensors if possible One point SoftCal calibrations for applications under 30 K are performed at liquid helium 4 2 K temperature Accuracy for the DT 470 SD 13 diode is 0 5 K from 2 K to 30 K with no accuracy change above 30 K Two point SoftCal calibrations for applications above 30 K are performed at liquid nitrogen 77 35 K and room temperature 305 K ...

Page 116: ...ata point near room temperature 305 K Acceptable tem perature entries are 200 K to 300 K D Point 3 calibration data point at a higher temperature 480 K Acceptable tem perature entries are 400 K to 600 K 5 10 4 SoftCal Accuracy With Platinum Sensors A SoftCal calibration is only as good as the accuracy of the calibration points The accuracies listed for SoftCal assume 0 05 K for 77 35 K liquid nitr...

Page 117: ...FIGURE 5 8 and FIGURE 5 9 If a temperature value outside of the acceptable range is entered the value will be limited to the closest acceptable value Once the data points are entered highlight Generate Softcal and press Enter Choose Yes at the confirmation message to finalize the operation To cancel the operation either choose No to the confirmation message or press Escape When the Softcal curve h...

Page 118: ...104 cHAPTER 5 Advanced Operation Model 350 Temperature Controller ...

Page 119: ...ough the bus The Bus Control ler designates to the devices on the bus which function to perform The Model 350 performs the functions of Talker and Listener but it cannot be a Bus Controller The Bus Controller is the digital computer that tells the Model 350 which functions to perform TABLE 6 1 defines the IEEE 488 capabilities and subsets for the Model 350 Model 350 IEEE 488 interface capabilities...

Page 120: ... uniline command message asserts only a single signal line The Model 350 recognizes two of these messages from the Bus Controller Remote REN and Interface Clear IFC The Model 350 sends one uniline command Service Request SRQ D REN Remote puts the Model 350 into remote mode D IFC Interface Clear stops current operation on the bus D SRQ Service Request tells the bus controller that the Model 350 nee...

Page 121: ...er programs and the instru ment issues responses Two or more command strings or queries can be chained together in one communication but they must be separated by a semi colon The total communication string must not exceed 255 characters in length A command string is issued by the computer and instructs the instrument to perform a function or change a parameter setting When a command is issued the...

Page 122: ... are not latched or buffered The register is read only 6 2 4 2 Event Registers Each register set includes an event register as shown in FIGURE 6 1 Bits in the event register correspond to various system events and latch when the event occurs When an event bit is set subsequent events corresponding to that bit are ignored Set bits remain latched until the register is cleared by a query command such...

Page 123: ...QYE OPC Not used Not used Not used OSB MSS ESB RQS MAV Not used Not used Not used Not used OSB CAL RAMP1 RAMP2 OVLD ALARM CAL RAMP1 RAMP2 OVLD ALARM ESB Not used MAV Not used CAL COM COM COM RAMP1 RAMP2 ATUNE NRDG ATUNE NRDG ATUNE NRDG OVLD ALARM Not used Not used Not used Bit Name Bit Name Bit Name Bit Name Bit Name Bit Name Bit Name Output buffer Status byte register STB Service request enable r...

Page 124: ...e Service Request Enable Register When you set a Ser vice Request Enable Register bit and the corresponding summary bit is set in the Sta tus Byte the RQS MSS bit of the Status Byte will be set which in turn sets the Service Request hardware line on the bus 6 2 4 6 Reading Registers You can read any register in the status system using the appropriate query command Some registers clear when read ot...

Page 125: ...andard Event Status Register Set The Standard Event Status Register reports the following interface related instru mentevents power on detected commandsyntax errors command execution errors query errors operation complete Any or all of these events may be reported in the standard event summary bit through the enable register FIGURE 6 2 The Standard Event Status Enable command ESE programs the enab...

Page 126: ... the query command OPSTE reads it OPSTR reads and clears the Operation Event Register OPST reads the Operation Condition register The used bits of the Operation Event Register are described as fol lows D Processor Communication Error COM Bit 7 this bit is set when the main pro cessor cannot communicate with the sensor input processor D Calibration Error CAL Bit 6 this bit is set if the instrument ...

Page 127: ...ot latched Clearing an event register will clear the corresponding summary bit in the Status Byte Register Reading all messages in the output buffer including any pending queries will clear the message available bit The bits of the Status Byte Register are described as follows D Operation Summary OSB Bit 7 this bit is set when an enabled operation event has occurred D Request Service RQS Master Su...

Page 128: ...om operation event register From standard event status register From operation event register 8 4 2 1 16 32 64 128 8 4 2 1 16 32 64 128 6 2 6 3 Using Service Request SRQ and Serial Poll When a Status Byte summary bit or MAV bit is enabled by the Service Request Enable Register and goes from 0 to 1 bit 6 RQS MSS of the status byte will be set This will send a service request SRQ interrupt message t...

Page 129: ...bus controller to look for the SRQ leaving the bus available for other use The MAV bit will be clear whenever the output buffer is empty 6 2 6 6 Using Operation Complete OPC and Operation Complete Query OPC The Operation Complete OPC and Operation Complete Query OPC are both used to indicate when pending device operations complete However the commands operate with two distinct methods The OPC comm...

Page 130: ...ation to communicate properly with the Model 350 The proper configu ration parameters are listed in TABLE 6 5 Host com port configuration Baud rate 57 600 Data bits 7 Start bits 1 Stop bits 1 Parity Odd Flow control None Handshaking None The USB hardware connection uses the full speed 12 000 000 bits sec profile of the USB 2 0 standard however since the interface uses a virtual serial com port at ...

Page 131: ...a tion message stating the wizard has finished installing the software for Lake Shore Model 350 Temperature Controller will appear Click Finish to com plete the installation 6 3 3 3 Installing the Driver From the Web The Model 350 USB driver is available on the Lake Shore website To install the driver it must be downloaded from the website and extracted Use the procedure in section 6 3 3 1 through...

Page 132: ...l be between Network adapters and Ports COM LPT If the Other Devices item is not already expanded click the icon Lake Shore Model 350 should appear indented underneath Other Devices If it is not displayed as Lake Shore Model 350 it might be displayed as USB Device If neither are displayed click Action and then Scan for hardware changes which may open the Found New Hardware wizard automatically If ...

Page 133: ...ble on the included CD The following section describes the process of installing the driver from the CD To install the driver you must be logged into a user account that has administrator privileges For Windows 7 and Vista 1 Insert the CD into the computer 2 Follow steps 1 9 of the Windows Vista procedure in section 6 3 3 3 3 3 Click Browse and select the drive containing the included CD 4 Ensure ...

Page 134: ...5 characters in length A command string is issued by the computer and instructs the instrument to perform a function or change a parameter setting The format is command mnemonic space parameter data terminators Command mnemonics and parameter data necessary for each one is described in section 6 6 Terminators must be sent with every message string A query string is issued by the computer and instr...

Page 135: ...n contact your network administrator for assistance 6 4 1 1 Network Address Parameters Network address parameters include the IP address the subnet mask and the gate way address The network address parameters of the Model 350 can be configured using one of three methods DHCP Auto IP or Static IP See section 6 4 1 2 for details on each of these configuration methods D IP Address an IP address is re...

Page 136: ...gur ing the IP address subnet mask and gateway of Ethernet devices on a network This method provides simple automatic configuration for users connecting to a network that provides a DHCP server The network DHCP server will provide an IP address sub net mask and gateway address Depending on the DHCP server configuration it may also provide primary DNS and secondary DNS addresses as well DHCP is the...

Page 137: ...c IP to manually config ure the IP address subnet mask and gateway of the Model 350 set the DHCP and the Auto IP parameters to Off Refer to the paragraphs above for details on turning off DHCP and Auto IP The Model 350 will now use the Static IP Address Static Subnet Mask Static Gateway Static Primary DNS and Static Secondary DNS parameters to attempt to configure the Ethernet interface connection...

Page 138: ...hostname can be assigned by a network administrator or if the Model 350 is con nected to a network with Dynamic DNS DDNS capability a DNS entry is automati cally created for it using the Preferred Hostname and Preferred Domain Name parameters and the assigned IP address Menu Navigation InterfaceQModify IP Config QPreferred HostnameQ Valid Hostname String If DNS reverse lookup is enabled on the net...

Page 139: ... and the current state of the Ethernet configuration is detailed in the View IP Config submenu This is designed to eliminate confusion as to which are the configurable Static IP settings and which are the currently configured settings that could have been configured using any of the three configuration methods DHCP Auto IP or Static IP The method used for the currently established connection is sh...

Page 140: ...nfig QSubnet Mask InterfaceQView IP ConfigQGateway IP InterfaceQView IP ConfigQPrimary DNS IP InterfaceQView IP Config QSecondary DNS IP InterfaceQView IP ConfigQActual Hostname InterfaceQView IP ConfigQTCP Socket Port 6 4 3 TCP Socket Communication A TCP socket connection interface is provided as the communication medium for the Ethernet interface of the Model 350 A TCP socket connection or simpl...

Page 141: ...vice on the network section 6 4 1 3 then the IP address can be replaced by the hostname If connecting from a device not on the same local network but on a network which is connected to the local network of the Model 350 and a hostname and a domain name are properly assigned the IP address can be replaced by the host name followed by the domain name with a dot separator between them For exam ple if...

Page 142: ...ernet Configuration Page provides a means of reconfiguring the Ethernet config uration parameters of the Model 350 Ethernet configuration page Ethernet Status Page provides status and statistics related to the current Ethernet connection Ethernet status page FIGURE 6 6 FIGURE 6 7 ...

Page 143: ...pro vide any kind of security for TCP Socket access section 6 4 3 The website username and password are available from the front panel menu and there fore can easily be obtained by anyone with access to the Model 350 front panel Contact Us provides information regarding how to contact representatives of Lake Shore Cryotronics Inc 6 5 Utilities The utilities embedded on the Model 350 are written us...

Page 144: ...l 350 click Read from Instrument The Read Curve from Instrument dialog box appears Select a curve from the drop down box and click OK The curve will be loaded into the program and the curve points and graph will be displayed Once a curve is loaded into the Embedded Curve Handler using either the Read from File or Read from Instrument buttons the loaded curve can be stored either to a user curve lo...

Page 145: ... first ensure that your Java Runtime Environment is at version 1 6 0 or higher and then use this procedure to download the Ethernet firmware Updater utility 1 Download the latest Model 350 Ethernet Firmware file from www lakeshore com 2 Once the firmware files have been downloaded connect to the embedded web site section 6 4 4 and navigate to the Utilities page 3 Click Launch Ethernet Firmware Upd...

Page 146: ...m unintentionally turning on and to prevent interrupting communication with the instrument To export the current configuration of the Model 350 to a file 1 On the Utilities page in the Model 350 embedded website click Export config FIGURE 6 8 2 In the Save File dialog box select the location and file name to which you want to export the current instrument configuration Click Save The utility will ...

Page 147: ...es to comma separated plain text files csv if Micro soft Excel is not available Embedded chart recorder interface 6 5 4 1 Configuration Panel The configuration panel is located to the right of the chart and consists of items 12 through 17 in the screenshot above It is used to configure the charting and logging functionality for the next data acquisition task When Start is pressed the parame ters i...

Page 148: ...will be autoscaled so if more than one reading is being taken in the same unit the scale for the associated axis will be set such that the largest values of all readings are at the extremes Data that is charted on the same axis but that is far apart in magnitude will result in low resolution for each data series Manual zooming of the chart can be achieved either by using the mouse wheel or by clic...

Page 149: ...e updated independently so once the values in the Control panel are updated click Send before clicking another Loop radio button The utilities panel can be collapsed to increase the size of the chart To collapse the utilities panel click Collapse Utilities Panel 10 When collapsed the same button becomes an Expand Utilities Panel button that can be used to restore the utilities panel on the form 6 ...

Page 150: ...f the command input Syntax of user parameter input see key below Definition of first parameter Definition of second parameter Input Format a nn input Specify input A D curve number Input Curve Number Command Specify input curve 0 none 1 20 std curves 21 59 user curves Sample query format INCRV input term INCRV Brief description of query Query name Form of the query input Syntax of user parameter i...

Page 151: ...D Control Loop PID Values Cmd 153 BRIGT Display Contrast Query 142 PID Control Loop PID Values Query 153 CRDG Celsius Reading Query 142 RAMP Control Setpoint Ramp Parameter Cmd 153 CRVDEL Curve Delete Cmd 143 RAMP Control Setpoint Ramp Parameter Query 153 CRVHDR Curve Header Cmd 143 RAMPST Control Setpoint Ramp Status Query 153 CRVHDR Curve Header Query 143 RANGE Heater Range Cmd 154 CRVPT Curve D...

Page 152: ...r Standard Event Status Register and Opera tion Event Register and terminates all pending operations Clears the interface but not the controller The related controller command is RST ESE Event Status Enable Register Command Input ESE bit weighting term Format nnn Remarks Each bit is assigned a bit weighting and represents the enable disable mask of the corresponding event flag bit in the Standard ...

Page 153: ... output queue upon completion of all pending selected device operations Send as the last command in a command string Not the same as OPC RST Reset Instrument Command Input RST term Remarks Sets controller parameters to power up settings SRE Service Request Enable Register Command Input SRE bit weighting term Format nnn Remarks Each bit has a bit weighting and represents the enable disable mask of ...

Page 154: ...nnnn nnnnnn nnnnnn n n n input Specifies which input to configure A D D1 D5 for 3062 option off on Determines whether the instrument checks the alarm for this input where 0 off and 1 on high setpoint Sets the value the source is checked against to activate the high alarm low setpoint Sets the value the source is checked against to activate low alarm deadband Sets the value that the source must cha...

Page 155: ...ion units Specifies the units on which to base the output voltage 1 kelvin 2 Celsius 3 sensor units high value If output mode is Monitor Out this parameter represents the data at which the Monitor Out reaches 100 output Entered in the units designated by the units parmeter Refer to OUTMODE command low value If output mode is Monitor Out this parameter represents the data at which the analog output...

Page 156: ...ted with the loop to be Autotuned 1 4 mode Specifies the Autotune mode Valid entries 0 P Only 1 P and I 2 P I and D Example ATUNE 2 1 term initiates Autotuning of control loop associated with output 2 in P and I mode Remarks If initial conditions required to Autotune the specified loop are not met an Autotune initialization error will occur and the Autotune process will not be performed The TUNEST...

Page 157: ... User Curve 21 with a name of DT 470 serial number of 00011134 data format of volts versus kelvin upper temperature limit of 325 K and negative coefficient CRVHDR Curve Header Query Input CRVHDR curve term Format nn curve Valid entries 1 59 Returned name SN format limit value coefficient term Format s 15 s 10 n nnn nnn n refer to command for description CRVPT Curve Data Point Command Input CRVPT c...

Page 158: ...r type is not set to Diode when the DIOCUR command is sent the command will be ignored DISPFLD Custom Mode Display Field Command Input DISPFLD field input units term Format n n n field Specifies field display location to configure 1 8 input Specifies item to display in the field 0 None 1 Input A 2 Input B 3 Input C 4 Input D 5 Input D2 6 Input D3 7 Input D4 8 Input D5 for 3062 option units Valid e...

Page 159: ...Setup Query Input DISPLAY term Returned mode num fields output source term Format n n n refer to command for description FILTER Input Filter Parameter Command Input FILTER input off on points window term Format a n nn nn input Specifies input to configure A D D1 D5 for 3062 option off on Specifies whether the filter function is 0 Off or 1 On points Specifies how many data points the filtering func...

Page 160: ...e displayed in units of current HTRSET Heater Setup Query Input HTRSET output term Format n output Specifies which heater output to query 1 or 2 Returned htr resistance max current max user current current power term Format n n n nnn n HTRST Heater Status Query Input HTRST output term Format n output Specifies which heater output to query 1 or 2 Returned error code term Format n error code Heater ...

Page 161: ...pace term the string Sample Space will appear on the front panel display when possible to identify the sensor information being displayed Remarks Be sure to use quotes when sending strings otherwise characters such as spaces and other non alpha numeric characters will be interpreted as a delimiter and the full string will not be accepted It is not recommended to use commas or semi colons in sensor...

Page 162: ... 10 k NTC RTD 10 mV or 1 mV 0 10 1 30 2 100 3 300 4 1 k 5 3 k 6 10 k 7 30 k 8 100 k 10 mV 9 300 k Thermocouple na 0 50 mV Capacitance na 0 15nF 1 150 nF compensation Specifies input compensation where 0 off and 1 on Reversal for thermal EMF compensation if input is resistive room com pensation if input is thermocouple Also used to set tempera ture coefficient for capacitance sensors where 0 negati...

Page 163: ...G Kelvin Reading Query Input KRDG input term Format a input Specifies which input to query A D D1 D5 for 3062 option Returned kelvin value term Format nnnnnn Remarks Also see the RDGST command LEDS Front Panel LEDS Command Input LEDS off on term Format n off on 0 LEDs Off 1 LEDs On Remarks If set to 0 front panel LEDs will not be functional Function can be used when display brightness is a problem...

Page 164: ...ut MODE term Returned mode term Format n refer to command for description MOUT Manual Output Command Input MOUT output value term Format n nnnnn term output Specifies output to configure 1 4 value Specifies value for manual output Example MOUT 1 22 45 term Output 1 manual output is 22 45 Remarks Manual output only applies to outputs in Closed Loop PID Zone or Open Loop modes MOUT Manual Output Que...

Page 165: ... connection 0 Connected Using Static IP 1 Connected Using DHCP 2 Connected Using Auto IP 3 Address Not Acquired Error 4 Duplicate Initial IP Address Error 5 Duplicate Ongoing IP Address Error 6 Cable Unplugged 7 Module Error 8 Acquiring Address 9 Ethernet Disabled Refer to section 6 4 2 1 for details on lan status IP Configured IP address sub mask Configured subnet mask gateway Configured gateway ...

Page 166: ... tus bits These status bits are latched when the condition is detected This register is cleared when it is read Refer to section 6 2 5 2 for a list of operational status bits OUTMODE Output Mode Command Input OUTMODE output mode input powerup enable term Format n n n n output Specifies which output to configure 1 4 mode Specifies the control mode Valid entries 0 Off 1 Closed Loop PID 2 Zone 3 Open...

Page 167: ...n rate value term Format n n nnnn output Specifies which output s control loop to configure 1 4 off on Specifies whether ramping is 0 Off or 1 On rate value Specifies setpoint ramp rate in kelvin per minute from 0 1 to 100 The rate is always positive but will respond to ramps up or down A rate of 0 is interpreted as infinite and will therefore respond as if setpoint ramping were off Example RAMP 1...

Page 168: ...rned represents the sum of the bit weighting of the input status flag bits A 000 response indicates a valid reading is present Bit Bit Weighting Status Indicator 0 1 invalid reading 4 16 temp underrange 5 32 temp overrange 6 64 sensor units zero 7 128 sensor units overrange RELAY Relay Control Parameter Command Input RELAY relay number mode input alarm alarm type term Format n n a n relay number S...

Page 169: ...lue Specifies third temperature point in kelvin U3 value Specifies third sensor units point Remarks Generates a SoftCal curve Refer to Paragraph 5 3 Example SCAL 1 21 1234567890 4 2 1 6260 77 32 1 0205 300 0 0 5189 term generates a three point SoftCal curve from standard curve 1 and saves it in user curve 21 SETP Control Setpoint Command Input SETP output value term Format n nnnnnn output Specifie...

Page 170: ...sor input Example TLIMIT B 450 term if the temperature of the sensor on Input B exceeds 450 K all control outputs will be turned off Remarks A temperature limit setting of 0 K turns the temperature limit feature off TLIMIT Temperature Limit Query Input TLIMIT input term Format a input Specifies which input to query A D D1 D5 for 3062 option Returned limit term Format nnnn refer to command for desc...

Page 171: ...erm Format n nnn nn output Specifies which analog output to query 3 or 4 Returned control percentage term Format n nnn refer to command for description WEBLOG Website Login Parameters Input WEBLOG username password term Format s 15 s 15 username 15 character string representing the website username password 15 character string representing the website password Example WEBLOG user pass sets the use...

Page 172: ...ater range for this zone Valid entries 0 Off 1 Low 2 Med 3 High input Specifies the sensor input to use for this zone 0 Default Use previously assigned sensor 1 Input A 2 Input B 3 Input C 4 Input D 5 Input D2 6 Input D3 7 Input D4 8 Input D5 for 3062 option rate Specifies the ramp rate for this zone 0 1 100 K min Remarks Configures the output zone parameters Refer to Paragraph 2 9 Example ZONE 1 ...

Page 173: ...2 Diode RTD expansion input option card Adds 4 scanned diode RTD inputs to the Model 350 7 3 Accessories Accessories are devices that perform a secondary duty as an aid or refinement to the primary unit Refer to the Lake Shore Temperature Measurement and Control Catalog for details A list of accessories available for the Model 350 is as follows TABLE 7 1 TABLE 7 2 TABLE 7 3 Model Description of Ac...

Page 174: ...llowing the grease to form a cushion between matingsurfaces Meltingpointis 316K 43 C CanberemovedusingXylenewithanisopropyl alcohol rinse HTR 25 25 CartridgeHeater Theheaterfeaturesprecision woundnickel chromiumresistancewire magnesium oxide insulation 2 solid pins non magnetic package and has UL and CSA compo nentrecognition Theheateris25 6 35mm 0 25in diameterby25 4mm 1in long The25 rating is in...

Page 175: ...ot guarantee good electrical contact between the instrument and cabinet They should not be used for ground strapping unless paint is removed from under all screws Ensure that there is a 25 mm 1 in clearance on both sides of the instrument after rack mounting Model RM 1 rack mount kit Item Description PN Qty Rack mount ear 107 440 2 Screw 6 32 3 8 PH FLHD MS SS 0 033 4 Rack mount handles 3 in black...

Page 176: ...tracks Remove rear bottom cover screw unshown Rear panel option plate screws 3 Use a small Phillips screwdriver to remove the 2 top cover screws and 1 rear bottom screw FIGURE 7 3 4 Remove the rear plastic bezel The cover is tracked Slide the top cover to the rear on the track to remove it 5 Remove the rear panel option plate screws and set aside Remove the rear panel option plate 6 With the instr...

Page 177: ...J12 FIGURE 8 11 12 Slide the top panel forward in the track provided on each side of the unit 13 Replace the rear plastic bezel by sliding it straight into the unit 14 Use a small Phillips screwdriver to replace the two top cover screws and the one bottom cover screw 15 Use the hex driver to replace the 4 screws on the sides of the top covers Tighten the two rear bottom screws 16 Replace the power...

Page 178: ...164 cHAPTER 7 Options and Accessories Model 350 Temperature Controller ...

Page 179: ...essage terminator 7 Send the entire message string at one time including the terminator Many ter minal emulation programs do not 8 Send only one simple command at a time until communication is established 9 Be sure to spell commands correctly and use proper syntax 8 2 2 Existing Installation No Longer Working 1 Power the instrument off then on again to see if it is a soft failure 2 Power the compu...

Page 180: ...elay between all commands to 50 ms to make sure the instrument is not being overloaded 8 4 Fuse Drawer The fuse drawer supplied with the Model 350 holds the instrument line fuses and line voltage selection module The drawer holds two 5 mm 20 mm 0 2 in 79 in time delay fuses It requires two good fuses of the same rating to operate safely Refer to section 8 6 for details Fuse drawer Front view Side ...

Page 181: ...mall screwdriver release the drawer holding the line voltage selector and fuse 5 Remove existing fuse s Replace with proper Slow Blow time delay fuse ratings as follows 100 120 220 240 V 3 14 A T 250 V 5 20 mm 6 Re assemble the line input assembly in reverse order 7 Verify voltage indicator in the line input assembly window 8 Connect the instrument power cord 9 Turn the power switch On l 8 7 Facto...

Page 182: ...efficient Positive Web password Alarm Default Output Setup Default Alarm Off Output mode Closed loop PID off for Output 3 and 4 Relay Default Control input Input A for Output 1 Input B for Output 2 none for output 3 and 4 Relay Off Heater resistance 25 Keypad Locking Default Power up enable Off Mode Unlocked Heater out display Current Lock code 123 Setpoint ramping Off PID Manual Heater Power MHP ...

Page 183: ...llow which includes a reference to which sensor input s temperature limit has been exceeded Keypad Locked An attempt has been made to change a parameter while the keypad is locked Refer to section 4 7 Heater Short Circuit Detected A short circuit condition has been observed on heater output 1 A detailed message will follow which includes a reference to which output caused the condition The output ...

Page 184: ...t and IEEE 488 connec tors are defined in FIGURE 8 3 through FIGURE 8 8 For thermocouple connector details refer to FIGURE 3 8 Sensor input A through D Sensor input A through D connector details Pin Symbol Description 1 I Current 2 V Voltage 3 None Shield 4 V Voltage 5 I Current 6 None Shield Heater output connectors FIGURE 8 3 TABLE 8 3 FIGURE 8 4 ...

Page 185: ... 1 normally closed 6 Relay 1 common 7 Relay 1 normally open 8 Relay 2 normally closed 9 Relay 2 common 10 Relay 2 normally open USB pin and connector details 2 1 3 4 USB pinand connector details Pin Name Description 1 VCC 5 VDC 2 D Data 3 D Data 4 GND Ground 8 10 RearPanelConnectorDefinition 171 www lakeshore com FIGURE 8 5 TABLE 8 4 FIGURE 8 6 TABLE8 5 ...

Page 186: ...e has 24 conductors with an outer shield The connectors are 24 way Amphenol 57 Series or equivalent with piggyback recepta cles to allow daisy chaining in multiple device systems The connectors are secured in the receptacles by 2 captive locking screws with metric threads The total length of cable allowed in a system is 2 m for each device on the bus or 20 m maximum The Model 350 can drive a bus o...

Page 187: ...lies and equip ment ESD is a transfer of electrostatic charge between bodies at different electro static potentials caused by direct contact or induced by an electrostatic field The low energy source that most commonly destroys Electrostatic Discharge sensitive devices is the human body which generates and retains static electricity Simply walking across a carpet in low humidity may generate up to...

Page 188: ... D Do not handle ESD sensitive devices unnecessarily or remove them from the packages until they are actually used or tested 8 12 EnclosureTop Remove and Replace Procedure Follow this procedure to remove the top enclosure The enclosure top remove and replace procedure if for installing an input option card To avoid potentially lethal shocks turn off the controller and disconnect it from AC power b...

Page 189: ...ps screwdriver to replace the two top cover screws and 1 rear bottom screw 7 Use the hex driver to replace the two screws on the side of the top covers 8 Replace the rear plastic bezel by sliding it straight into the unit 9 Tighten the two rear bottom screws 10 Replace the power cord in the rear of the unit and set the power switch to On Location of internal components JMP1 J12 option connector JM...

Page 190: ... return a product to Lake Shore without a Return Material Authorization RMA number section 8 14 2 8 14 1 Contacting Lake Shore The Lake Shore Service Department is staffed Monday through Friday between the hours of 8 00 AM and 5 00 PM EST excluding holidays and company shut down days Contact Lake Shore Service through any of the means listed below However the most direct and efficient means of con...

Page 191: ...vice Department The service engineer will use the information provided in the service request form and will issue an RMA This number is necessary for all returned equipment It must be clearly indicated on both the shipping carton s and any correspondence relating to the shipment Once the RMA has been approved you will receive appropriate documents and instructions for shipping the equipment to Lak...

Page 192: ...178 cHAPTER 8 Service Model 350 Temperature Controller ...

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