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116

HAPTER

Computer Interface Operation

Model 335 Temperature Controller

HTRSET

Heater Setup Command

Input

HTRSET <output>,<type>,<heater resistance>,<max cur-

rent>,<max user current>,<current/power>[term]

Format

n,n,n,n,+n.nnn,n
<output>

Specifies which heater output to configure: 1 or 2.

<type>

Output type (Output 2 only): 0=Current, 1=Voltage

Heater Resistance Setting: 1 = 25

)

, 2 = 50

)

Specifies the maximum heater output current:



0 = User Specified, 1 = 0.707 A, 2 = 1 A, 3 = 1.141 A,

4 = 1.732 A

Specifies the maximum heater output current if



max current is set to User Specified.

Specifies whether the heater output displays in current or



power (current mode only). Valid entries: 1 = current,



2 = power.

Example

HTRSET 2,0,1,2,0,1[term]

Heater Output 2 uses the current source output, the

)

heater setting, has a maximum current of 1 A, the maximum user current is set

to 0 A because it is not going to be used since a discrete value has been chosen, and
the heater output will be displayed in units of current.

Remarks

Max current will be limited to 1 A on Output 1 if the heater resistance is set to 50

)

. If

the heater resistance is set to 25

)

on Output 1, then the max current will be limited

to 1.414 A if Output 2 is in Current mode, or 1.732 A if Output 2 is in Voltage mode. See
section 4.5.1.3 for more information on the max current setting.

HTRSET?

Heater Setup Query

Input

HTRSET? <output>[term]

Format

n
<output>

Specifies which heater output to query: 1 or 2.

Returned

<type>,<htr resistance>,<max current>,<max user current>,<current/power>[term]

Format

n,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 error code: 0 = no error, 1 = heater open load, 2 = heater short.

Remarks

Error condition is cleared upon querying the heater status, which will also clear the
front panel error message.

IEEE

IEEE-488 Interface Parameter Command

Input

IEEE <address>[term]

Format

nn
<address>

Specifies the IEEE address: 1–30. (Address 0 and 31 are reserved.)

Example

IEEE 4[term]

after receipt of the current terminator, the instrument responds to

address 4.

Содержание 335

Страница 1: ...al support or relationship whatsoever has existed which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics Inc in these developments Methods and apparatus 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 notic...

Страница 2: ...ein Lake Shore undertakes no responsibility that the products will be fit for any particular purpose for which you may be buying the Products Any impliedwarranty is limitedinduration tothe warranty period No oral or written information or advice given by the Company its Agents or Employees shall create a warranty or in any way increase the scope of this limited warranty Some countries states or pr...

Страница 3: ...changes made to the firmware FIRMWARE LICENSE AGREEMENT continued Under the terms of this agreement you may only use the Model 335 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 instrument to Lake Shore for repair under the terms of ...

Страница 4: ...is in conformity with the relevant Union harmonization legislation 2014 35 EU Low Voltage Directive 2014 30 EU EMC Directive 2011 65 EU RoHS References to the relevant harmonized standards used to the specification in relation to which conformity is declared EN 61010 1 2010 Overvoltage Category II Pollution Degree 2 EN 61326 1 2013 Class A Controlled Electromagnetic Environment EN 50581 2012 Signe...

Страница 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...

Страница 6: ...Model 335 Temperature Controller ...

Страница 7: ... Range 13 2 2 2 Sensor Sensitivity 13 2 2 3 Environmental Conditions 14 2 2 4 Measurement Accuracy 14 2 2 5 Sensor Package 14 2 3 Sensor Calibrations 14 2 3 1 Precision Calibration 15 2 3 2 SoftCal 15 2 3 3 Sensors Using Standard Curves 15 2 3 4 Curve Handler 15 2 4 Sensor Installation 16 2 4 1 Mounting Materials 16 2 4 2 Sensor Location 16 2 4 3 Thermal Conductivity 16 2 4 4 Contact Area 17 2 4 5...

Страница 8: ... Sensor Inputs 31 3 5 1 Sensor Input Connector and Pinout 31 3 5 2 Sensor Lead Cable 32 3 5 3 Grounding and Shielding Sensor Leads 32 3 5 4 Sensor Polarity 33 3 5 5 Four Lead Sensor Measurement 33 3 5 6 Two Lead Sensor Measurement 34 3 5 7 Lowering Measurement Noise 34 3 6 Thermocouple Sensor Inputs Thermocouple Model 3060 35 3 6 1 Sensor Input Terminals 35 3 6 2 Thermocouple Installation 35 3 6 3...

Страница 9: ...etup Model 3060 Only 50 4 4 6 1 Internal Room Temperature Compensation 50 4 4 6 2 Internal Room Temperature Compensation Calibration Procedure 50 4 4 7 Curve Selection 51 4 4 8 Filter 52 4 4 9 Input Sensor Name 53 4 4 10 Temperature Limit 53 4 4 11 Preferred Units 54 4 4 12 Max Min 54 4 5 Output and Control Setup 54 4 5 1 Heater Outputs 54 4 5 1 1 Heater Output Type Output 2 55 4 5 1 2 75 W Config...

Страница 10: ... Delete a Breakpoint Pair 80 5 9 1 4 Thermocouple Curve Considerations 80 5 9 2 Erase Curve 81 5 9 3 Copy Curve 81 5 10 SoftCal 81 5 10 1 SoftCal with Silicon Diode Sensors 82 5 10 2 SoftCal Accuracy with DT 400 Series Silicon Diode Sensors 83 5 10 3 SoftCal With Platinum Sensors 83 5 10 4 SoftCal Accuracy With Platinum Sensors 84 5 10 5 SoftCal CalibrationCurve Creation 84 5 11 Emulation Modes 85...

Страница 11: ...00 6 3 3 1 Installing the Driver From Windows Update in Windows Vista or Windows 7 100 6 3 3 2 Installing the Driver From Windows Update in Windows XP 101 6 3 3 3 Installing the Driver From the Web 101 6 3 3 3 1 Download the driver 101 6 3 3 3 2 Extract the driver 101 6 3 3 3 3 Manually install the driver 102 6 3 3 4 Installing the USB Driver from the Included CD 103 6 3 4 Communication 104 6 3 4 ...

Страница 12: ...Discharge 139 8 11 1 Identification of Electrostatic Discharge Sensitive Components 139 8 11 2 Handling Electrostatic Discharge Sensitive Components 139 8 12 Model 3060 Installation 139 8 13 Firmware Updates 141 8 13 1 Updating the Firmware 141 8 13 2 Record of Updates Made to the Firmware 141 8 14 Technical Inquiries 142 8 14 1 Contacting Lake Shore 142 8 14 2 Return of Equipment 142 8 14 3 RMA V...

Страница 13: ...or more expensive high end temperature controllers The Model 335 is the first two channel temperature controller available with user configurable heater outputs delivering a total of 75 W of low noise heater power 50 W and 25 W or 75 W and 1 W With that much heater power packed into an afford able half rack sized instrument the Model 335 gives you more power and control than ever Control outputs a...

Страница 14: ...re controller you control from the world leader in cryogenic thermometry 1 1 1 Sensor Inputs The Model 335 offers two standard sensor inputs that are compatible with diode and RTD temperature sensors The field installable Model 3060 option adds thermocou ple functionality to both inputs Sensor inputs feature a high resolution 24 bit analog to digital converter and each of the two powered outputs f...

Страница 15: ...de 50 W and 25 W of continuous power respectively both to a 50 or 25 load For increased functionality Output 2 can also be set to voltage mode When set to voltage mode it functions as a 10 V analog output while still providing 1 W of heater power and full closed loop PID control capa bility While in this mode output 1 can provide up to 75 W of heater power to a 25 load Temperature limit settings f...

Страница 16: ... input is associated D Two Input Output Display with Labels Standard display option featuring two inputs and associated outputs D Custom Display with Labels Reading locations can be user configured to accom modate application needs Here the input names are shown above the measure ment readings along with the designated input letters D Intuitive Menu Structure Logical navigation allows you to spend...

Страница 17: ... T 4 2 K B 5 T GaAlAs Diode TG 120 PL 1 4 K to 325 K T 4 2 K B 5 T GaAlAs Diode TG 120 SD 1 4 K to 500 K T 4 2 K B 5 T Positive Tempera ture Coefficient RTDs 100 Platinum PT 102 3 14 K to 873 K T 40 K B 2 5 T 100 Platinum PT 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 Rhodium Iron RF 100T U 1 4 K to 325 K T 77 K B 8 T Negative Temperature Coefficient RTDs Cer...

Страница 18: ...K 280 µK 46 mK Cernox CX 1050 SD HT6 with 1 4M calibration 1 4 K 4 2 K 77 K 420 K 26566 3507 2 205 67 45 03 48449 K 1120 8 K 2 4116 K 0 0829 K 20 µK 196 µK 1 9 mK 18 mK 0 3 mK 2 1 mK 38 mK 338 mK 5 3 mK 7 1 mK 54 mK 403 mK 40 µK 392 µK 3 8 mK 36 mK Germanium GR 300 AA with 0 3D calibration 0 35 K 1 4 K 4 2 K 100 K 18225 449 94 2 7 193453 K 581 K 26 6 K 0 024 K 4 µK 41 µK 56µK 6 3 mK 48 µK 481 µK 1...

Страница 19: ...0 m NTC RTD 10 mV Negative 0 to 10 1 mA4 1 m 0 15 m 0 002 0 06 of rdg 0 01 m 0 001 of rdg C 0 3 m 0 to 30 300 µA4 1 m 0 45 m 0 002 0 06 of rdg 0 03 m 0 0015 of rdg C 0 9 m 0 to 100 100 µA4 10 m 1 5 m 0 01 0 04 of rdg 0 1 m 0 001 of rdg C 3 m 0 to 300 30 µA4 10 m 4 5 m 0 01 0 04 of rdg 0 3 m 0 0015 of rdg C 9 m 0 to 1 k 10 µA4 100 m 15 m 0 002 of rdg 0 1 0 04 of rdg 1 m 0 001 of rdg C 30 m 0 004 of...

Страница 20: ... Sensor dependent refer to Input Specifications table Measurement resolution Sensor dependent refer to Input Specifications table Maximum update rate 10 rdg s on each input 5 rdg s when configured as 100 k NTC RTD with reversal on Autorange Automatically selects appropriate NTC RTD or PTC RTD range User curves Room for 39 200 point CalCurves or user curves SoftCal Improves accuracy of DT 470 diode...

Страница 21: ...or out D A resolution 15 bit 16 bit bipolar 15 bit unipolar 25 setting 50 setting N A Max power 25 W 25 W 1 W Max current 1 A 0 71 A 100 mA Voltage compliance min 25 V 35 4 V 10 V Heater load for max power 25 50 100 Heater load range 10 to 100 100 min short circuit protected Ranges 3 decade steps in power N A Heater noise 0 12 µA RMS 0 3 mV RMS Heater connector Dual banana Detachable terminal bloc...

Страница 22: ... 488 2 Capabilities SH1 AH1 T5 L4 SR1 RL1 PP0 DC1 DT0 C0 E1 Reading rate To 10 rdg s on each input Software support LabVIEW driver contact Lake Shore for availability USB Function Emulates a standard RS 232 serial port Baud Rate 57 600 Connector B type USB connector Reading rate To 10 rdg s on each input Software support LabVIEW driver contact Lake Shore for availability Special interface features...

Страница 23: ...e 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 holes ...

Страница 24: ...d 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 12 cHAPTER 1 Introduction Model 335 Temperature...

Страница 25: ...ry If an experiment is being done at liquid helium temperature a very high sensitivity is needed for good measurement resolution at that temperature That same resolution may not be required to monitor warm up to room temperature Two different sensors may be required to tightly cover the range from base temperature to room temperature but lowering the resolution requirement on warm up may allow a l...

Страница 26: ...al temperature range as sensitivity can minimize the effect of most error sources Install the sensor properly following guidelines in section 2 4 Have the sen sor and instrument periodically recalibrated or in some other way null the time dependent errors Use a sensor calibration that is appropriate for the accuracy requirement 2 2 5 Sensor Package Many types of sensors can be purchased in differe...

Страница 27: ...ensors The standard inputs are limited to operation above 300 mK even with sensors that can be calibrated to 20 mK 2 3 2 SoftCal SoftCal is a good solution for applications that do not require the accuracy of a pre cision calibration The SoftCal algorithm uses the well behaved nature of sensors that follow a standard curve to improve the accuracy of individual sensors A few known temperature point...

Страница 28: ...f fer by more than three A flexible mounting scheme should be used or the parts will break apart potentially damaging them The thermal expansion or contraction of rigid clamps or holders could crush fragile samples or sensors that do not have the same coefficient Thermal conductivity is a property of materials that can change with temperature Do not assume that a thermal anchor grease that works w...

Страница 29: ...tress sensor packages Less perma nent mountings require some pressure to hold the sensor to its mounting surface Pressure greatly improves the action of gasket material to increase thermal conduc tivity and reduce thermal gradients A spring clamp is recommended so that different rates of thermal expansion do not increase or decrease pressure with temperature change 2 4 6 Lead Wire Different types ...

Страница 30: ... be tinned before bonding to reduce the time that heat is applied to the sensor lead Solder flux should be cleaned after soldering to prevent corrosion or outgassing in vacuum 2 4 8 Thermal Anchoring Leads Sensor leads can be a significant source of error if they are not properly anchored Heat will transfer down even small leads and alter the sensor reading The goal of thermal anchoring is to cool...

Страница 31: ...cooling power The resistive heater must be able to provide sufficient heating power to warm the system The Model 335 can provide up to 75 W of power from Output 1 up to 25 W of power from Output 2 in current mode and up to 1 W of power from Output 2 in voltage mode TABLE 2 2 provides the current and voltage limits as well as the resulting maximum power for each output for the 25 and 50 settings us...

Страница 32: ...fer to section 4 5 1 3 1 for details on using the max user current setting The resistor chosen as a heater must be able to withstand the power being dissipated in it Pre packaged resistors have a power specification that is usually given for the resistor in free air This power may need to be derated if used in a vacuum where con vection cooling cannot take place and it is not adequately anchored t...

Страница 33: ...ivity themselves but as sensors heaters sample holders etc are added to an ever more crowded space the junctions between parts are often over looked In order for control to work well junctions between the elements of the con trol loop must be in close thermal contact and have good thermal conductivity Gasket materials should always be used along with reasonable pressure section 2 4 4 and section 2...

Страница 34: ...nges in cooling power and sensor sensitivity are also sources of nonlinearity The cooling power of most cooling sources also changes with load temperature This is very important when operating at temperatures near the highest or lowest tem perature that a system can reach Nonlinearities within a few degrees of these high and low temperatures make it very difficult to configure them for stable cont...

Страница 35: ...ral setting In the Model 335 the integral term is not set in seconds like some other systems The integral setting can be derived by dividing 1000 by the integral seconds Isetting 1000 Iseconds 2 7 3 Derivative D The derivative term also called rate acts on the change in error with time to make its contribution to the output Output D PD de dt By reacting to a fast changing error signal the derivati...

Страница 36: ...Examples of PID control 24 cHAPTER 2 Cooling System Design and Temperature Control Model 335 Temperature Controller FIGURE 2 2 ...

Страница 37: ...ature 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 ranges for good control o...

Страница 38: ...ws the Model 335 control algorithm to gradually eliminate the difference in tem perature by integrating the error over time See FIGURE 2 2 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 control...

Страница 39: ...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 algorithm can be fooled whe...

Страница 40: ...a Peltier device or a solid state 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 ...

Страница 41: ...y with shipping companies Keep all damaged shipping materials and contents until instructed to either return or discard them Open the shipping container and keep the container and shipping materials until all contents have been accounted for Check off each item on the packing list as it is unpacked Instruments themselves may be shipped as several parts The items included with the Model 335 are lis...

Страница 42: ... making any rear panel connections This is espe cially critical when making sensor to instrument connections Model 335 rear panel 3 4 Line Input Assembly This section describes how to properly connect the Model 335 to line power Please follow these instructions carefully to ensure proper operation of the instrument and the safety of operators Line input assembly 3 4 1 Line Voltage The Model 335 ha...

Страница 43: ... cord is included with instruments shipped to Europe a domestic power cord is included with all other instruments unless otherwise specified when ordered Always plug the power cord into a properly grounded receptacle to ensure safe instru ment operation The delicate nature of measurements being taken with this instrument may necessi tate additional grounding including ground strapping of the instr...

Страница 44: ...ronmental conditions may degrade accuracy and noise specifica tions Refer to section 2 4 6 for information about wiring inside the cryostat 3 5 3 Grounding and Shielding Sensor Leads The sensor inputs are isolated from earth ground to reduce the amount of earth ground referenced noise that is present on the measurement leads Connecting sen sor leads to earth ground on the chassis of the instrument...

Страница 45: ... Diode sensor leads Cathode Anode 3 5 5 Four Lead Sensor Measurement All sensors including both 2 lead and 4 lead can be measured with a 4 lead tech nique The purpose of a 4 lead measurement is to eliminate the effect of lead resis tance on the measurement If it is not taken out lead resistance is a direct error when measuring a sensor In a 4 lead measurement current leads and voltage leads are ru...

Страница 46: ...onnectors are also a big source of error when making 2 lead measurements Con nector contact resistance is unpredictable and changes with time and temperature Minimize interconnections when making 2 lead measurements Refer to FIGURE 3 6 for an image of a 2 lead sensor measurement 2 lead sensor measurement I V V I 3 5 7 Lowering Measurement Noise Good instrument hardware setup technique is one of th...

Страница 47: ...e unique challenges A general sensor installation guide line is provided in section 2 4 Consider the following when using thermocouples at low temperatures D Thermocouple wire is generally more thermally conductive than other sensor lead wire Smaller gauge wire and more thermal anchoring may be needed to prevent leads from heating the sample D Attaching lead wires and passing them through vacuum t...

Страница 48: ...wer is applied in one of three ranges high med or low Each range is one decade lower in power Refer to TABLE 4 11 for maxi mum current and power ratings into different heater resistance 3 7 2 Heater Output Connectors Dual banana jacks on the rear panel of the instrument are used for connecting wires to the heater outputs Two standard dual banana plug mating connectors are included in the connector...

Страница 49: ...PID control warm up control or open loop operation This section describes choosing and installing an external supply Section 5 5 describes operation of the warm up supply mode 3 7 5 1 Choosing a Power Supply D Voltage programmable the power supply must be voltage programmable so that Output 2 in voltage mode can control it Ideally the supply s programming input should have a range of 0 V to 10 V t...

Страница 50: ...e present at their input when they are turned off This can happen if the Model 335 and power supply use a different source of line power or are turned on and off individ ually It can be avoided if the two instruments share a switched power strip D The heater and wiring in the system must be rated for both the maximum current and maximum voltage provided by the power supply The Model 335 can be set...

Страница 51: ... the ratio of resistors R1 to R2 Vout 10 V R1 R1 R2 It is also important to keep the sum of R1 R2 1000 or the Model 335 output may not reach the output voltage setting due to internal overload protection For a programming input range of 0 V to5 V rec ommended values are R1 R2 2000 For a programming input range of 0 V to1 V recommended values are R1 500 R2 4500 Exact resistor value type and tol era...

Страница 52: ...40 cHAPTER 3 Installation Model 335 Temperature Controller ...

Страница 53: ...om 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 would see on the screen or the ne...

Страница 54: ...s key to adjust the Manual Output setting of the currently displayed output if applicable 4 5 1 7 5 All Off Press this key to set the range for all outputs to Off not applicable for Monitor Out mode 4 5 1 7 9 4 2 1 2 Menu Number Pad Keys Menu number pad keys Key Function Refer to section Input setup Press this key to configure features related to the inputs 4 4 for sensor input setup 4 4 7 for cur...

Страница 55: ...igation Number Entry Alpha Numeric Entry and setting selection D Direct operation the key function occurs as soon as the key is pressed these include the Setpoint P I D Manual Out Heater Range and All Off keys D Menu Navigation each menu has a set of configurable parameters Menus that apply to multiple entities for example Input Setup could apply to Input A or B have a first level selection to det...

Страница 56: ...h simultaneously displays up to four readings 4 3 1 Display Modes The Model 335 provides four display modes designed to accommodate different instrument configurations and user preferences The display modes are listed here and further information is provided for each display in section 4 3 1 1 to section 4 3 1 4 D The Two Input One Loop display mode provides both sensor readings as well as control...

Страница 57: ... be found under the Input Setup menu section 4 4 Menu Navigation Display SetupQDisplay Mode Two Loop Mode Interface Command DISPLAY Two loop mode 4 3 1 3 Input Display Modes The input display mode provides detailed information about an input sensor and the associated control loop if applicable and they are most commonly accessed by press ing the A and B on the keypad These modes are called Input A...

Страница 58: ... Display Mode The custom display mode provides the ability to customize the displayed front panel information to your preference The display is divided into four quadrants Each quad rant can be independently configured to display various information These are the options available D None the display location will be blank D Input A or Input B after choosing Input A or Input B for a custom display ...

Страница 59: ... Control Catalog or visit our website at www lakeshore com Any unused input should be set to disabled Sensor input types Sensor type Display message Input range Excitation Coefficient Curve format Lake Shore sensors Silicon diode Diode 0 V to 2 5 V 10 µA 1 mA Negative V K DT 4XX DT 500 DT 670 Series Gallium aluminum arsenide diode Diode 0 V to 10 V 10 µA 1 mA Negative V K TG 120 Series Platinum RT...

Страница 60: ...n current for the PTC resistor sensor type A resistance range selection is available in order to achieve better reading resolution Autorange is enabled by default in order to provide the best possible reading resolution but it does not affect the sensor current excitation Refer to section 4 4 4 for details on manually selecting the range Current Reversal is also enabled by default in order to comp...

Страница 61: ...on To keep power low and avoid sensor self heating the sensor excitation is kept low There are two major problems that occur when measuring the resulting small DC voltages The first is external noise entering the measurement through the sensor leads which is discussed with sensor installation section 2 4 The second is the pres ence of thermal EMF voltages or thermocouple voltages in the lead wirin...

Страница 62: ...l room tempera ture compensation is included for convenience section 4 4 6 2 and should be cali brated before use Room temperature compensation is enabled by default but can be turned off if external compensation is being used Menu Navigation Input SetupQInput A or B QSensor Type Thermocouple Interface Command INTYPE 4 4 6 1 Internal Room Temperature Compensation Room temperature compensation is r...

Страница 63: ...ocouple 6 Press Input Setup and select the corresponding sensor input Press Enter until the Room Calibration parameter appears then press until Yes appears press Enter to accept it 7 The current temperature reading is displayed in kelvin Enter the true tempera ture that the thermocouple should read If the input is shorted then enter the actual room temperature measured by the thermometer Press Ent...

Страница 64: ...ature 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 You are also given the choice of None When set to None the front panel readings configured for kelvin or Celsius will display the NOCURV message and the interface will report 0 K and 273 15 C for KRDG and C...

Страница 65: ... QFilter Window 1 to 10 Default FilterQ Off Filter PointsQ8 Filter WindowQ10 Interface FILTER 4 4 9 Input Sensor Name To increase usability and reduce confusion the Model 335 provides a means of assigning a name to each sensor input The designated input sensor name is displayed on the front panel when the A or B keys are pressed identifying the respective sensor The input sensor name can also be c...

Страница 66: ...he output open loop This section describes how to operate the output and control features and how to set control parameters Each control parameter should be considered before turn ing on a control loop output or the instrument may not be able to perform the most simple control functions A good starting point is deciding which control loop to use whether to operate in open or closed control mode an...

Страница 67: ...Current setting on Output 1 3 Apply this setting 1 732 A 75 W setting to get the desired 75 W output 4 Alternatively the User setting can be used for the Max Heater Output setting to set the maximum current to any value from 0 1 A to 1 732 A Once a Max Current setting of more than 1 41 A is applied the Heater Output Type for Output 2 cannot be set back to Current until the Max Current setting for ...

Страница 68: ...ut SetupQOutput 1 or 2 Q ENTER QHeater Resistance 25 or 50 Output SetupQOutput 1 or 2 Q ENTER QMax Current User 0 707 A 1 A or 1 732 A Default Heater ResistanceQ25 Output 1 QMax Current 1 414 A Output 2QMax Current 1 A Interface Command HTRSET 4 5 1 3 1 User Max Current The provided discrete Max Current settings of 0 707 A 1 A 1 414 A and 1 732 A are available for the common heater resistor values...

Страница 69: ...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 dark blue Max current too high for these resistances due to voltage compliance limit Shaded light blue Maximum current power only available on heater output 1 Bold Discrete options available for 25 and 50 heaters under the Max Current setting Menu Navigation Output SetupQOutput 1 or 2 Q ENT...

Страница 70: ... commonly used closed loop control mode for tightly controlling temperature using the heater outputs of the Model 335 In this mode the controller attempts to keep the load exactly at the setpoint temperature you entered To do this it uses feedback from the control input sensor to calculate and actively adjust the control output setting The Model 335 uses a control algorithm called PID that refers ...

Страница 71: ...front panel the Manual Output and Heater Range direct operation keys can be used for one touch 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 ...

Страница 72: ...panel A or B keys to temporarily display the control loop information while the new setting is entered Refer to section 4 3 for details on configuring the front panel display Menu Navigation PQ 0 to 1000 Default 50 Interface Command PID 4 5 1 7 3 Integral I The integral parameter also called reset is the I part of the PID control equation It has a range of 0 to 1000 with a resolution of 0 1 The de...

Страница 73: ...e front panel or over the computer interface In closed loop control mode Manual Output is added directly to the output of the PID control equation In effect the control equa tion operates about the Manual Output setting The Manual Output setting is expressed in percent of full scale Percent of full scale is defined as percent of full scale current or power on the selected heater range Refer to sec...

Страница 74: ...t entry For even greater protection the Temperature Limit feature can be used to turn off all heater outputs if a sensor reading above the specified temperature is observed Refer to section 4 4 10 for details on the Temperature Limit feature There are some instances when temperature control in sensor units may be desired for example when a temperature curve is not available For these applications ...

Страница 75: ...d with other features Setpoint ramps are often used with zone control mode As tempera ture is ramped through different temperature zones control parameters are auto matically selected for best control Ramps can be initiated and status read back using a computer interface During computer controlled experiments the instrument gen erates the setpoint ramp while the computer is busy taking necessary d...

Страница 76: ...panel A quick way to access the setting if the control loop information is not already displayed is to use the front panel A or B keys to temporarily display the control loop information while the new setting is entered Refer to section 4 2 for details on configuring the front panel display Menu Navigation Heater RangeQ Off On Low Med High Default Off Interface Command RANGE 4 5 1 7 9 ALL OFF The ...

Страница 77: ...rame ters related to the selected interface 4 6 1 USB The USB interface is provided as a convenient way to connect to most modern com puters as a USB interface is provided on nearly all new PCs as of the writing of this manual The Model 335 USB driver which must be installed before using the inter face section 6 3 3 creates a virtual serial com port which can be used in the same way as a tradition...

Страница 78: ... press and hold Enter for 5 s Use the numeric keypad to enter the three digit lock code If the lock code is accepted Keypad Locked will be dis played for 3 s and the display will return to normal Changes attempted to any param eters result in a brief display of the Keypad Locked message To unlock the keypad press and hold Enter for 5 s Use the numeric keypad to enter the three digit lock code If t...

Страница 79: ... 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 stabilize after setpoint change than Autotune PID Expect some over shoot or undershoot of ...

Страница 80: ...ameters are caus ing instability in the control Use a smaller initial P value 5 Testing for temperature stability Ensures that there is no temperature oscillation or excessive noise in the temperature reading after control parameter adjustment System response is too slow to Autotune or the new control parameters are causing instability in the control Use a smaller initial P value 6 Observing syste...

Страница 81: ...etting a setpoint of 2 K with Setpoint Ramping turned On the setpoint will begin ramping at the current setpoint Ramp Rate then once the setpoint crosses 100 K the control parameters from Zone 7 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 6 are loaded This pattern will continue until the final setpoint...

Страница 82: ...portional 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 1 100 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 ...

Страница 83: ...4 for information on scaling the output for voltages less than 10 V Menu Navigation Output SetupQOutput 2QOutput Type Voltage ENTER Q Polarity Bipolar Interface Command ANALOG 5 5 Warm Up Supply Warm Up Supply mode is designed for controlling an external power supply used for rapidly increasing the temperature in the controlled system for example to bring a system to room temperature in order to c...

Страница 84: ... Navigation Output SetupQOutput 2QOutput Type Voltage Q Output Mode Warm Up Supply QControl Input A B ENTER QWarmup Control Auto Off Interface Command WARMUP D Continuous this mode implements what is often referred to as On Off control Once the Heater Range is set to on the Warm Up Percentage voltage is applied to the output until the control input temperature reaches the setpoint Then the output ...

Страница 85: ...ther unipolar or bipolar modes Unipolar and bipolar mode Bipolar Lowest Middle Highest 10 V 0 V 10 V 0 V 5 V 10 V Lowest Middle Highest Input mode Input Output Input Output Unipolar For example if Polarity is set to Bipolar then setting the Monitor Out 10 V parameter to 0 K and the Monitor Out 10 V parameter to 100 K will cause the voltage output to correspond to the input temperature as shown in ...

Страница 86: ...ace Command ALARM 5 7 1 1 Alarm Annunciators The Alarm LED annunciator steadily displays when any alarm that is enabled also has the Visible parameter enabled The annunciator flashes when an alarm with the Visi ble parameter enabled activates An input need not be displayed for the system Alarm annunciator to indicate input alarm status but if the input is displayed on the front panel then the read...

Страница 87: ...n alarm setpoint and dead band in non latching operation With the high alarm setpoint at 100 K and the dead band at 5 K the high alarm triggers when sensor input temperature increases to 100 K and it will not deactivate until temperature drops to 95 K In addition the same 5 K dead band is applied to the low alarm setpoint as well Dead band example High alarm activated Low alarm activated Low alarm...

Страница 88: ...larms Relay active when either the High or Low Alarm is active Low Alarms Relay active only when the Low Alarm is active High Alarms Relay active only when the High Alarm is active When using relays with 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 335 rear panel In the Off mode the relay is un energiz...

Страница 89: ...at the format parameter tells the instrument what breakpoint data format to expect Different sensor types require different formats Formats for Lake Shore sensors are described in TABLE 5 3 Curve header parameter Format Description Sensor units full scale range Sensor units maximum resolution V K Volts vs kelvin 10 V 0 00001 V K Resistance vs kelvin for platinum RTD sensors 10 K 0 001 Log K Log re...

Страница 90: ... sen sor units resolutions The breakpoints should be entered with the sensor units value increasing as point number increases There should not be any breakpoint locations left blank in the mid dle of a curve The search routine in the Model 335 interprets a blank breakpoint as the end of the curve 5 9 Front Panel Curve Entry Operations There are four operations associated with front panel curve ent...

Страница 91: ...scroll to the desired 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 Again use the Number Entry method to enter the new temperature value 4 Pressing Enter...

Страница 92: ...the new value when you press the Enter key After editing adding or deleting all desired breakpoint pairs press Escape while the highlight is on a breakpoint number All breakpoint pair changes additions and dele tions will be saved when exiting the menu When curve entry is complete assign the new curve to an input The Model 335 does not automatically assign the new curve to any input Refer to secti...

Страница 93: ...sired user curve location to copy to and press Enter 3 Choose Yes at the confirmation message to finalize the operation 4 To cancel the operation either choose No to the confirmation message or press Escape Menu Navigation Curve Entry QCopy Curve Q Copy Curve from 1 to 59 QCopy Curve to 21 to 59 Interface Command No interface command directly corresponds to the copy curve operation The CRVHDR and ...

Страница 94: ...kably uniform sensing elements that exhibit precise monotonic and repeatable temperature response For example the Lake Shore DT 400 Series of silicon diode sensors have a repeatable temperature response from 2 K to 475 K These sensors closely follow a standard curve SoftCal is an inexpensive way to improve the accuracy of an already predictable sensor A unique characteristic of DT 400 Series diode...

Страница 95: ... 375 K 1 0 K 375 to 475 K Three point SoftCal calibrations are performed at liquid helium 4 2 K liquid nitro gen 77 35 K and room temperature 305 K Accuracy for the DT 470 SD 13 diode sensor is as follows Three point SoftCal calibration accuracy for DT 470 SD 13 diode sensors 0 5 K 2 K to 30 K 0 25 K 30 K to 60 K 0 15 K 60 K to 345 K 0 25 K 345 K to 375 K 1 0 K 375 to 475 K 5 10 3 SoftCal With Pla...

Страница 96: ... room temperature 305 K and high temperature 480 K Accuracy for the PT 102 PT 103 or PT 111 platinum sensor is 250 mK from 70 K to 325 K and 250 mK from 325 K to 480 K 5 10 5 SoftCal CalibrationCurve Creation Once the calibration data points have been obtained you may create a SoftCal cali bration To create a SoftCal calibration use this procedure 1 Press Curve Entry then scroll to SoftCal and pre...

Страница 97: ...are capabilities of the previous model temperature controllers The Model 331 Emulation mode will trigger the output type setting for Output 2 to be configured to Voltage because the voltage output on the Model 335 exactly matches the hardware capabilities of the Loop 2 output on the Model 331 The Model 332 emulation mode will trigger the output type setting for Output 2 to be configured to Current...

Страница 98: ...tion mode in order for the commands to be interpreted correctly 5 11 4 PID Scaling Mode The PID Scaling mode determines whether the Model 335 emulates the control scal ing of the Model 331 and Model 332 In the Model 331 and Model 332 temperature control is calculated using sensor units Sensor units can cause the control response to be non linear across temperature ranges if the sensor s temperatur...

Страница 99: ...e from the front panel the user is also prompted to set the Output Type for Output 2 In most cases the Voltage setting is more appropriate for Model 331 emulation and the Current setting is more appropriate for Model 332 emulation but the user must determine the appropriate setting for the given system The Output 2 current source is NOT limited to 10 V and is capable of providing more than 25 W of...

Страница 100: ...88 cHAPTER 5 Advanced Operation Model 335 Temperature Controller ...

Страница 101: ...esignates to the devices on the bus which function to perform The Model 335 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 335 which functions to perform TABLE 6 1 defines the IEEE 488 capabilities and subsets for the Model 335 Model 335 IEEE 488 interface capabilities and their subsets Subset Capabili...

Страница 102: ...uniline command message asserts only a single signal line The Model 335 recognizes two of these messages from the Bus Controller Remote REN and Interface Clear IFC The Model 335 sends one uniline command Service Request SRQ D REN Remote puts the Model 335 into remote mode D IFC Interface Clear stops current operation on the bus D SRQ Service Request tells the bus controller that the Model 335 need...

Страница 103: ... 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 c...

Страница 104: ...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 as ESR o...

Страница 105: ...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...

Страница 106: ...ervice Request Enable Register When a Ser vice Request Enable Register bit is set by the user and the corresponding summary bit is set in the Status 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 Any register in the status system may be read using the appropriate query command Some registers clear when r...

Страница 107: ...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...

Страница 108: ...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 i...

Страница 109: ... Register FIGURE 6 4 These summary bits are not 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...

Страница 110: ...Service request enable register SRE SRE From 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...

Страница 111: ...us 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 comma...

Страница 112: ...n to communicate properly with the Model 335 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 s profile of the USB 2 0 standard however since the interface uses a virtual serial com port at a fixe...

Страница 113: ...message stating the wizard has finished installing the software for Lake Shore Model 335 Temperature Controller will appear Click Finish to com plete the installation 6 3 3 3 Installing the Driver From the Web The Model 335 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 sectio...

Страница 114: ...s this will be between Network adapters and Ports COM LPT If the Other Devices item is not already expanded click the icon Lake Shore Model 335 should appear indented underneath Other Devices If it is not displayed as Lake Shore Model 335 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 automat...

Страница 115: ...ete the installation 6 3 3 4 Installing the USB Driver from the Included CD The Model 335 USB driver is available 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 Vista or Windows 7 1 Insert the CD into the computer 2 Follow steps 1 9 of the ...

Страница 116: ...ssues command and query strings through user programs the instrument issues responses Two or more command or query strings can be chained together in one communication but they must be separated by a semi colon The total com munication 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 ...

Страница 117: ... to establish communication with the instrument or intermittent failures in communication 6 4 Command Summary This section provides a listing of the interface commands A summary of all the com mands is provided in TABLE 6 6 All the commands are detailed in section 6 4 1 and are presented in alphabetical order Sample command format INCRV input curve number term INCRV Brief description of command Co...

Страница 118: ...112 POLARITY Output Voltage Polarity Query 122 CRVDEL Curve Delete Cmd 112 PID Control Loop PID Values Cmd 121 CRVHDR Curve Header Cmd 112 PID Control Loop PID Values Query 121 CRVHDR Curve Header Query 112 RAMP Control Setpoint Ramp Parameter Cmd 122 CRVPT Curve Data Point Cmd 113 RAMP Control Setpoint Ramp Parameter Query 122 CRVPT Curve Data Point Query 113 RAMPST Control Setpoint Ramp Status Q...

Страница 119: ...f command or query issued CLS Clear Interface Command Input CLS term Remarks Clears the bits in the Status Byte Register 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 ...

Страница 120: ...odel number instrument serial Instrument serial number option card serial Option card serial number firmware version Instrument firmware version Example LSCI MODEL335 1234567 1234567 1 0 OPC Operation Complete Command Input OPC term Remarks Generates an Operation Complete event in the Event Status Register upon comple tion of all pending selected device operations Send it as the last command in a ...

Страница 121: ...eturned bit weighting term Format nnn refer to section 6 2 6 for a list of status flags STB Status Byte Query Input STB term Returned bit weighting term Format nnn Remarks Acts like a serial poll but does not reset the register to all zeros The integer returned represents the sum of the bit weighting of the status flag bits that are set in the Status Byte Register Refer to section 6 2 6 for a list...

Страница 122: ...s Valid entries 0 off 1 on visible Specifies if the Alarm LED on the instrument front panel will blink when an alarm condition occurs Valid entries 0 off 1 on Remarks Configures the alarm parameters for an input Example ALARM A 0 term turns off alarm checking for Input A ALARM B 1 270 0 0 0 1 1 1 term turns on alarm checking for input B activates high alarm if kelvin reading is over 270 and latche...

Страница 123: ...put 10 0 V and 0 0 K at 0 output 0 0 V Remarks Use the OUTMODE command to set the output mode to Monitor Out The input parameter in the ANALOG command is the same as the input parameter in the OUT MODE command It is included in the ANALOG command for backward compatibility with previous Lake Shore temperature monitors and controllers The ANALOG com mand name is also named as such for backward comp...

Страница 124: ... characters SN Specifies the curve serial number Limited to ten characters format Specifies the curve data format Valid entries 1 mV K 2 V K 3 K 4 log K limit value Specifies the curve temperature limit in kelvin coefficient Specifies the curves temperature coefficient Valid entries 1 negative 2 positive Remarks Configures the user curve header The coefficient parameter will be calculated auto mat...

Страница 125: ...ndard or user curve data point DFLT Factory Defaults Command Input DFLT 99 term Remarks Sets all configuration values to factory defaults and resets the instrument The 99 is included to prevent accidentally setting the unit to defaults DIOCUR Diode Excitation Current Parameter Command Input DIOCUR input excitation term Format a n input Specifies which input to configure A or B excitation Specifies...

Страница 126: ...en the entire twenty character line can be used allowing all fifteen sensor name characters to be displayed This command only applies to the readings displayed in the Custom display mode All other display modes have predefined readings in predefined locations and will use the Preferred Units parameter to determine which units to display for each sensor input Refer to section 4 3 for details on dis...

Страница 127: ...o 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 or B off on Specifies whether the filter function is 0 Off or 1 On points Specifies how many data points the filtering function uses Valid range 2 64 window Specifies what percent of full scale reading limits the filtering function Readi...

Страница 128: ...ter output will be displayed in units of current Remarks Max current will be limited to 1 A on Output 1 if the heater resistance is set to 50 If the heater resistance is set to 25 on Output 1 then the max current will be limited to 1 414 A if Output 2 is in Current mode or 1 732 A if Output 2 is in Voltage mode See section 4 5 1 3 for more information on the max current setting HTRSET Heater Setup...

Страница 129: ...input to query A or B Returned curve number term Format nn refer to command for description INNAME Sensor Input Name Command Input INNAME input name term Format a s 15 input Specifies input to configure A or B name Specifies the name to associate with the sensor input Example INNAME A Sample Space term the string Sample Space will appear on the front panel display when possible to identify the sen...

Страница 130: ...f input is thermocouple Always 0 if input is a diode units Specifies the preferred units parameter for sensor readings and for the control setpoint 1 kelvin 2 Celsius 3 Sensor Example INTYPE A 2 1 0 1 1 term sets Input A sensor type to Platinum RTD autorange on thermal compensation on and preferred units to kelvin Remarks The autorange and range parameters do not apply to thermocouple sensor type ...

Страница 131: ...Lock Command Input LOCK state code term Format n nnn state 0 Unlocked 1 Locked code Specifies lock out code Valid entries are 000 999 Remarks Locks out all front panel entries except pressing ALL OFF to immediately turn off all heater outputs Refer to section 4 7 Example LOCK 1 123 term enables keypad lock and sets the code to 123 LOCK Front Panel Keyboard Lock Query Input LOCK term Returned state...

Страница 132: ... 1 or 2 Returned value Format nnnnn term refer to command for description OPST Operational Status Query Input OPST term Returned bit weighting term Format nnn Remarks The integer returned represents the sum of the bit weighting of the operational sta tus bits Refer to section 6 2 5 2 for a list of operational status bits OPSTE Operational Status Enable Command Input OPSTE bit weighting term Format...

Страница 133: ...e using Input A for the control input sensor and will turn the output off when power is cycled Remarks Modes 4 and 5 are only valid for Output 2 in Voltage mode OUTMODE Output Mode Query Input OUTMODE output term Format n output Specifies which output to query 1 or 2 Returned mode input powerup enable term Format n n n refer to command for description PID Control Loop PID Values Command Input PID ...

Страница 134: ...n 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 1 10 5 term when Output 1 setpoint is changed ramp the current set point to the target setpoint at 10 5 K minute Remarks Control loop settings ...

Страница 135: ...s 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 Specifies which...

Страница 136: ... Specifies second sensor units point T3 value Specifies third temperature point in kelvin U3 value Specifies third sensor units point Remarks Generates a SoftCal curve Refer to Paragraph 5 3 Example SCAL1 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 v...

Страница 137: ...ple 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 or B Returned limit term Format nnnn refer to command for description TUNEST Control Tuning Sta...

Страница 138: ...n nnnnn nnnnn nnnn nnnnn n n nnnn term output Specifies which heater output to configure 1 or 2 zone Specifies which zone in the table to configure Valid entries are 1 10 upper bound Specifies the upper Setpoint boundary of this zone in kelvin P value Specifies the P for this zone 0 1 to 1000 I value Specifies the I for this zone 0 1 to 1000 D value Specifies the D for this zone 0 to 200 mout valu...

Страница 139: ...fer to the Lake Shore Temperature Measurement and Control Catalog for details A list of accessories available for the Model 335 is as follows TABLE 7 1 TABLE 7 2 TABLE 7 3 Model Description of Accessories 106 009 Heater output connector dual banana jack G 106 233 Sensor input mating connector 6 pin DIN plug two included G 106 735 Terminal block 8 pin MAN 335 Model 335 user manual 112 177 Sensor he...

Страница 140: ...eater features precision wound nickel chromium resistance wire magnesium oxide insulation two solid pins non magnetic package and has UL and CSA com ponent recognition The heater is25 6 35 mm 0 25 in diameter by25 4 mm 1 in long The 25 rating is in dead air With proper heat sinking the cartridge heater can handle many times this dead air power rating HTR 50 50 cartridge heater The heater features ...

Страница 141: ...ack Mounting The Model 335 can be installed into a 483 mm 19 in rack mount cabinet using the optional Lake Shore Model RM rack mount kit The rack mount kit contains mounting ears panel handles and screws that adapt the front panel to fit into a 88 9 mm 3 5 in tall full rack space Refer to FIGURE 7 2 for installation details Ensure that there is a 25 mm 1 in clearance on both sides of the instrumen...

Страница 142: ...MS Phillips Refer to NOTE 130 cHAPTER 7 Options and Accessories Model 335 Temperature Controller 7 5 Model 3060 H Thermocouple Input Option The field installable Model 3060 H thermocouple input option adds thermocouple functionality to inputs A and B While the option can be easily removed this is not necessary as the standard inputs remain fully functional when they are not being used to measure t...

Страница 143: ...e message string at one time including the terminator Many terminal emulation programs do not 7 Send only one simple command at a time until communication is established 8 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 computer off then on again to see if com...

Страница 144: ...he delay 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 335 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 5 for details Fuse drawer Front view S...

Страница 145: ... ohmmeter Do not rely on visual inspection of the fuse 1 Locate the line input assembly on the instrument rear panel See Figure 8 2 2 Turn the power switch Off O 3 Remove the instrument power cord 4 With a small screwdriver release the drawer holding the line voltage selector and fuse 5 Remove existing fuse s Replace them with proper Slow Blow time delay fuse ratings as follows 100 120 220 240 V 3...

Страница 146: ...ature limit 0 K Off Alarm Off Input units Kelvin Relay Default Curve DT 670 Relay Off Input setup diode Default Keypad locking Default Range 2 5 V Silicon Mode Unlocked Diode current 10 µA Lock code 123 Input setup platinum NTC RTD Default PID manual heater power MHP output Default Autorange On Proportional P 50 0 Current reversal On Integral I 20 0 Input setup thermocouple Default Derivative D 0 ...

Страница 147: ... attempt has been made to change a parameter while the keypad is locked Refer to section 4 7 Heater 1 Short A short circuit condition has been observed on one of the heater outputs The output will be turned off when this occurs Heater 2 Short Heater 1 Open An open circuit condition has been observed on one of the heater outputs Heater 2 Open Invalid Cal Press Escape Enter The calibration memory is...

Страница 148: ...B and IEEE 488 connectors are defined in FIGURE 8 3 through FIGURE 8 7 For thermocouple connector details refer to FIGURE 3 7 Sensor input A and B Sensor input A and B 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 ...

Страница 149: ...y closed 4 Relay 1 common 5 Relay 1 normally open 6 Relay 2 normally closed 7 Relay 2 common 8 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 137 www lakeshore com FIGURE 8 5 TABLE 8 4 FIGURE 8 6 TABLE8 5 ...

Страница 150: ...ector pin location and signal names as viewed from the Model 335 rear panel IEEE 488 interface 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 IEEE 488 rear panel connector details Pin Symbol Description 1 DIO 1 Data input output line 1 2 DIO 2 Data input output line 2 3 DIO 3 Data input output line 3 4 DIO 4 Data input output line 4 5 EOI End or identify 6 DAV Data valid 7 NRFD Not...

Страница 151: ...fore attempting installation Bring the device and everything that contacts it to ground potential by providing a conductive surface and discharge paths As a minimum observe these precautions D De energize or disconnect all power and signal sources and loads used with unit D Place unit on a grounded conductive work surface D Technician should be grounded through a conductive wrist strap or other de...

Страница 152: ...both sides To remove top cover slide it to the rear on the tracks Rear panel option plate screws 3 Remove the rear plastic bezel The cover is tracked Slide the top cover to the rear on the track to remove it 4 Remove the rear panel option plate screws these screws are not used for the rest of the installation Remove the rear panel o 5 ption plate 6 Lay the instrument on its feet and turn it to vie...

Страница 153: ...check the instrument information Refer to sec tion 8 7 2 for more information on instrument information 8 13 Firmware Updates This section provides instructions for updating the firmware in your instrument 8 13 1 Updating the Firmware Periodically Lake Shore provides updates to instrument firmware The files for these updates can be downloaded from our website To access the firmware updates follow ...

Страница 154: ... Web service request http www lakeshore com sup serf html Instrument Service 8 14 2 Return of Equipment The temperature controller is packaged to protect it during shipment The user should retain any shipping carton s in which equipment is originally received in the event that any equipment needs to be returned If original packaging is not available a minimum of 76 2 mm 3 in of shock absorbent pac...

Страница 155: ...to be made prepaid by the customer Equipment serviced under warranty will be returned prepaid by Lake Shore Equipment serviced out of warranty will be returned FOB Lake Shore 8 14 5 Restocking Fee Lake Shore reserves the right to charge a restocking fee for items returned for exchange or reimbursement ...

Страница 156: ...144 cHAPTER 8 Service Model 335 Temperature Controller ...

Страница 157: ...ish astronomer D Fahrenheit abbreviation F A temperature scale that registers the freezing point of water as 32 F and the boiling point as 212 F under normal atmospheric pressure Originally devised by Gabriel Fahrenheit 1686 1736 a German phys icist residing in Holland developed use of mercury in thermometry D Kelvin abbreviation K An absolute scale of temperature the zero point of which is approx...

Страница 158: ... 230 43 15 219 67 139 82 133 33 50 45 56 227 59 380 228 89 44 26 210 134 44 138 71 49 67 45 37 227 78 379 67 228 71 44 44 209 67 134 26 138 89 45 67 43 15 230 370 223 33 49 82 207 67 133 15 140 40 40 233 15 369 67 223 15 50 202 130 143 15 39 67 39 82 233 33 364 220 53 15 200 128 89 144 26 30 34 44 238 71 360 217 78 55 37 199 67 128 71 144 44 29 67 34 26 238 89 359 67 217 59 55 56 190 123 33 149 82...

Страница 159: ...Helium Liquid Nitrogen Boiling Point at 1 atm 4 2 K 77 K Thermal Conductivity Gas w cm K 0 083 0 013 Latent Heat of Vaporization Btu L 2 4 152 Liquid Density lb L 0 275 0 78 B 3 Handling Cryogenic Storage Dewars Cryogenic containers Dewars must be operated in accordance with the manufac turer instructions Safety instructions will also be posted on the side of each Dewar Cryogenic Dewars must be ke...

Страница 160: ... with side shields are not adequate Always wear special cryogenic gloves Tempshield Cryo Gloves or equivalent when handling anything that is or may have been in contact with the liquid or cold gas or with cold pipes or equipment Long sleeve shirts and cuffless trousers that are of sufficient length to prevent liquid from entering the shoes are recommended B 5 Recommended First Aid Every site that ...

Страница 161: ... 35 135 0 0 90161 64 026 0 1 11896 7 445 0 0 16221 36 130 0 0 91243 65 025 0 1 12463 8 440 0 0 17464 37 125 0 0 92317 66 024 0 1 13598 9 435 0 0 18710 38 120 0 0 93383 67 023 0 1 15558 10 430 0 0 19961 39 115 0 0 94440 68 022 0 1 17705 11 420 0 0 22463 40 110 0 0 95487 69 021 0 1 19645 12 410 0 0 24964 41 105 0 0 96524 70 019 5 1 22321 13 400 0 0 27456 42 100 0 0 97550 71 017 0 1 26685 14 395 0 0 ...

Страница 162: ...48 0 44 1 12340 24 3 69 1 60756 3 18 20 0 914469 137 5 45 1 12589 24 0 70 1 62125 2 62 21 0 934356 127 5 46 1 12913 23 7 71 1 62945 2 26 22 0 952903 118 0 47 1 13494 23 3 72 1 63516 1 98 23 0 970134 109 0 48 1 14495 22 8 73 1 63943 1 74 24 0 986073 100 5 49 1 16297 22 0 74 1 64261 1 53 25 0 998925 93 5 50 1 17651 21 3 75 1 64430 1 40 150 Appendices Model 335 Temperature Controller TABLE C 3 Breakp...

Страница 163: ... 80 10 065 0 15 015 065 0 150 15 11 075 0 19 223 075 0 192 23 12 085 0 23 525 085 0 235 25 13 105 0 32 081 105 0 320 81 14 140 0 46 648 140 0 466 48 15 180 0 62 980 180 0 629 80 16 210 0 75 044 210 0 750 44 17 270 0 98 784 270 0 987 84 18 315 0 116 270 315 0 1162 70 19 355 0 131 616 355 0 1316 16 20 400 0 148 652 400 0 1486 52 21 445 0 165 466 445 0 1654 66 22 490 0 182 035 490 0 1820 35 23 535 0 ...

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Страница 170: ...8 00 16 4 801670 32 70 50 1 706840 195 00 84 3 300110 421 50 17 4 648620 42 00 51 1 568040 201 50 85 4 000810 451 50 18 4 569170 46 80 52 1 428520 208 00 86 4 246390 462 00 19 4 499080 51 00 53 1 277520 215 00 87 4 701810 481 50 20 4 435090 54 80 54 1 114900 222 50 88 4 947390 492 00 21 4 370520 58 60 55 0 940599 230 50 89 5 636410 521 50 22 4 303610 62 50 56 0 754604 239 00 90 5 870300 531 50 23 ...

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