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User's Manual
Model 335
Temperature Controller
Lake Shore Cryotronics, Inc.
sales@lakeshore.com
575 McCorkle Blvd.
service@lakeshore.com
Fax: (614) 891-1392
Westerville, Ohio 43082-8888 USA
www.lakeshore.com
Telephone: (614) 891-2243
Methods and apparatus disclosed and described herein have been developed solely on company funds of
Lake Shore Cryotronics, Inc. No government or other contractual 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 notice. Lake Shore shall not be liable for errors contained herein or for incidental or
consequential damages in connection with furnishing, performance, or use of this material.
Rev. 1.5
P/N 119-055
25 July 2017
|
www.lakeshore.com

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Summary of Contents for Lake Shore 335

  • Page 1 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 not be liable for errors contained herein or for incidental or consequential damages in connection with furnishing, performance, or use of this material.
  • Page 2 (b) the Product is fit for any particular purpose expressly or impliedly made known to Lake Shore at the time of the conclusion of 2.Lake Shore warrants the Product only if the Product has been sold the contract. (c) the Product is contained or packaged in a manner...
  • Page 3 Copyright 2011 - 2017 Lake Shore Cryotronics, Inc. All rights reserved. No portion of this manual may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the express written permission of Lake Shore.
  • Page 4 EN 61010-1:2010 Overvoltage Category II Pollution Degree 2 EN 61326-1:2013 Class A Controlled Electromagnetic Environment EN 50581:2012 Signed for and on behalf of: Place, Date: Westerville, OH USA Scott Ayer 29-SEP-2016 Director of Quality & Compliance Model 335 Temperature Controller...
  • Page 5 To qualify for the CE Mark, the Model 335 meets or exceeds the requirements of the European EMC Directive 89/335/EEC as a CLASS A product. A Class A product is allowed to radiate more RF than a Class B product and must include the follow- ing warning: WARNING: This is a Class A product.
  • Page 6 Model 335 Temperature Controller...
  • Page 7: Table Of Contents

    1.3 Model 335 Specifications ........
  • Page 8 3.7.5.3 Connecting to the Model 335 ........
  • Page 9 Chapter 4 4.1 General ................41 4.1.1 Understanding Menu Navigation .
  • Page 10 6.2.4 Status System Overview ............92 Model 335 Temperature Controller...
  • Page 11 6.2.4.1 Condition Registers ........... 92 6.2.4.2 Event Registers .
  • Page 12 8.14.1 Contacting Lake Shore ........
  • Page 13: Product Description

    ± 10 V analog voltage outputs, alarms, and relays Designed with the user and ease of use in mind, the Model 335 temperature control- ler offers many user-configurable features and advanced functions that until now have been reserved for more expensive, high-end temperature controllers. The Model 335 is the first two-channel temperature controller available with user ...
  • Page 14: Sensor Inputs

    Model 335 comes standard-equipped with all of the functionality of the controllers it replaces, but offers additional features that save you time and money. With the Model 335, you get a temperature controller you control from the world leader in cryogenic thermometry.
  • Page 15: Temperature Control

    1.1.2 Temperature Control 1.1.2 Temperature Providing a total of 75 W of heater power, the Model 335 is the most powerful half rack temperature controller available. Designed to deliver very clean heater power, Control precise temperature control is ensured throughout your full scale temperature range for excellent measurement reliability, efficiency and throughput.
  • Page 16: Configurable Display

    Option measure thermocouple temperature sensors. Calibration for the option is stored on the card so it can be installed in the field and used with multiple Model 335 tempera- ture controllers without recalibration. Model 335 Temperature Controller...
  • Page 17: Sensor Selection

    1.2 Sensor Selection 1.2 Sensor Silicon diodes are the best choice for general cryogenic use from 1.4 K to above room temperature. Diodes are economical to use because they follow a standard curve and Selection are interchangeable in many applications. They are not suitable for use in ionizing radiation or magnetic fields.
  • Page 18 Typical sensor sensitivities were taken from representative calibrations for the sensor listed Control stability of the electronics only, in an ideal thermal system Non-HT version maximum temperature: 325 K Accuracy specification does not include errors from room temperature compensation TABLE 1-2 Typical sensor performance Model 335 Temperature Controller...
  • Page 19: Model 335 Specifications

    1.3 Model 335 Specifications 1.3 Model 335 Specifications 1.3.1 Input Specifications Sensor Input range Excitation Display Measurement Electronic Measurement temperature Electronic temperature current resolution resolution accuracy coefficient stability coefficient (at 25 °C) Diode Negative 0 V to 2.5 V 10 µA ±0.05% 100 µV...
  • Page 20: Sensor Input Configuration

    1 to 200% with 1% resolution Manual output 0 to 100% with 0.01% setting resolution Zone control 10 temperature zones with P, I, D, manual heater out, heater range, control channel, ramp rate Setpoint ramping 0.1 K/min to 100 K/min Model 335 Temperature Controller...
  • Page 21 1.3.4 Control Type Variable DC current source Control modes Closed loop digital PID with manual output or open loop D/A resolution 16-bit 25 ) setting 50 ) setting Max power 75 W* 50 W 50 W Max current 1.73 A 1.41 A Voltage compliance (min) 43.3 V...
  • Page 22: Front Panel

    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) Function Emulates a standard RS-232 serial port Baud Rate 57,600 Connector...
  • Page 23: Safety Summary And Symbols

    Lake Shore Cryotronics, Inc. assumes no liability for Cus- tomer failure to comply with these requirements. The Model 335 protects the operator and surrounding area from electric shock or burn, mechanical hazards, excessive temperature, and spread of fire from the instru- ment.
  • Page 24 Earth (ground) terminal CAUTION or WARNING: See instrument documentation; background color: yellow; Protective conductor terminal symbol and outline: black Frame or chassis terminal On (supply) Off (supply) FIGURE 1-4 Safety symbols Model 335 Temperature Controller...
  • Page 25: General

    Another thing to consider when choosing a temperature sensor is that instruments like the Model 335 are not able to read some sensors over their entire temperature range. Lake Shore sells calibrated sensors that operate down to 20 millikelvin (mK), but the Model 335 is limited to above 300 mK in its standard configuration.
  • Page 26: Environmental Conditions

    Calibrations curve that the Model 335 can understand, and then getting the curve loaded into the instrument. Lake Shore provides a variety of calibration services to fit different accu- racy requirements and budgets.
  • Page 27: Precision Calibration

    Model 335 user curve loca- tions. You can use it to read curves from the Model 335 and save them to files. A CD is provided with Lake Shore calibrated sensors that contains all the proper formats to load curves using the Curve Handler™...
  • Page 28: Sensor Installation

    Windows® PC. This version works with the IEEE-488 and USB computer interfaces on the Model 335, and allows the temperature curves to be manipulated directly in the program window. This version will also work with all existing Lake Shore temperature controller and temperature monitor instruments.
  • Page 29: Contact Area

    2.4.4 Contact Area 2.4.4 Contact Area Thermal contact area greatly affects thermal conduction because a larger area has more opportunity to transfer heat. Even when the size of a sensor package is fixed, thermal contact area can be improved with the use of a gasket material like indium foil and cryogenic grease.
  • Page 30: Lead Soldering

    They can also be wound onto a bobbin that is firmly attached to the cold surface. Some sensor packages include a thermal anchor bobbin and wrapped lead wires to simplify thermal anchoring. Model 335 Temperature Controller...
  • Page 31: Thermal Radiation

    2.5.1 Heater Resistance Cryogenic cooling systems have a wide range of cooling power. The resistive heater must be able to provide sufficient heating power to warm the system. The Model 335 and Power can provide up to 75 W of power from Output 1, up to 25 W of power from ...
  • Page 32: Heater Location

    It is possible to choose a heater value that results in a maximum power greater than the power rating for either current source output, but doing so can cause the Model 335 to work improperly. In this situation the max user current setting should be used to limit the power.
  • Page 33: Heater Wiring

    If both control stability and measurement accuracy are critical it may be necessary to use two sensors, one for each function. Many tempera- ture controllers including the Model 335 have multiple sensor inputs for this reason. www.lakeshore.com...
  • Page 34: Thermal Mass

    2.7 PID Control For closed-loop operation, the Model 335 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 2-2. Changing these variables for best control of a system is called tuning.
  • Page 35: Proportional (P)

    I-setting when used. 2.7.4 Manual Output The Model 335 has a control setting that is not a normal part of a PID control loop. Manual Output can be used for open loop control, meaning feedback is ignored and the heater output stays at the user’s manual setting.
  • Page 36 2: Cooling System Design and Temperature Control HAPTER FIGURE 2-2 Examples of PID control Model 335 Temperature Controller...
  • Page 37: Manual Tuning

    Lower heater ranges are normally needed for lower temperature. The Model 335 is of no use controlling at or below the temperature reached when the heater was off. Many systems can be tuned to control within a degree or two above that temperature.
  • Page 38: Tuning Integral

    2. Use the oscillation period of the load that was measured in section 2.8.2 in sec- onds. Divide 1000 by the oscillation period to get the integral setting. 3. Enter the integral setting into the Model 335 and watch the load temperature approach the setpoint.
  • Page 39: Tuning Derivative

    D. Autotune works only with one control loop at a time and does not set the man- ual output or heater range. Setting an inappropriate heater range is potentially dan- gerous to some loads, so the Model 335 does not automate that step of the tuning process.
  • Page 40: Zone Tuning

    The parameters are then entered into the Model 335 where up to ten zones can be defined with different P, I, D, heater range, manual output, ramp rate, and control input settings. An upper boundary setting is assigned as the maximum temperature for that zone.
  • Page 41: General

    Model 335 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 they have not been notified within 60 days of shipment.
  • Page 42: Rear Panel Definition

    Line input assembly 3.4.1 Line Voltage The Model 335 has four different AC line voltage configurations so that it can be oper- ated from line power anywhere in the world. The nominal voltage and voltage range of each configuration is shown below. (The recommended setting for 230 V operation is 240 V.)
  • Page 43: Line Fuse And Fuse Holder

    3.4.2 Line Fuse and Fuse Holder 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.
  • Page 44: Sensor Lead Cable

    A shield is most effective when it is near the measurement potential so the Model 335 offers a shield at measurement common. The shield of the sensor cable should be connected to the shield pin of the input connector. The shields should not be connected to earth ground on the instrument chassis.
  • Page 45: Sensor Polarity

    3.5.4 Sensor Polarity 3.5.4 Sensor Polarity Lake Shore sensors are shipped with instructions that indicate which sensor leads are which. It is important to follow these instructions for plus and minus leads (polarity) as well as voltage and current when applicable. Diode sensors do not operate in the wrong polarity.
  • Page 46: Two-Lead Sensor Measurement

    Run different inputs and outputs in their own shielded cable Use twisted wire inside the cooling system Use twisted wire for heater leads Use a grounded receptacle for the instrument power cord Consider ground strapping the instrument chassis to other  instruments or computers Model 335 Temperature Controller...
  • Page 47: Thermocouple Sensor Inputs (Thermocouple Model 3060)

    3.6 Thermocouple Sensor Inputs (Thermocouple Model 3060) 3.6 Thermocouple The information in this section is for a Model 335 configured with thermocouple sen- sor inputs. Thermocouple inputs are not installed on the standard Model 335, but can Sensor Inputs be added by purchasing the Model 3060 dual thermocouple input option. Refer to (Thermocouple section 8.12 for installation of the Model 3060.
  • Page 48: Heater Output Setup

    This is a common jack and additional mating connectors can be purchased from local electronic suppliers, or from Lake Shore as P/N 106-009. The heater is connected between the HI  and LO terminals.
  • Page 49: Heater Output Noise

    Also avoid connecting heater leads to sensor leads or any other instrument inputs or outputs. 3.7.4 Heater Output The heater output circuitry in the Model 335 is capable of sourcing 75 W of power. This type of circuitry can generate some electrical noise. The Model 335 was designed Noise...
  • Page 50: Power Supply Setup

    Some power supplies can be damaged if there is a programming voltage 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.
  • Page 51: Programming Voltages Under 10 V

    = 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 ).
  • Page 52 3: Installation HAPTER Model 335 Temperature Controller...
  • Page 53: General

    4.1 General Chapter 4: Operation 4.1 General This chapter provides instructions for the general operating features of the Model 335 temperature controller. Advanced operation is in Chapter 5. Computer interface instructions are in Chapter 6. FIGURE 4-1 Model 335 front panel 4.1.1 Understanding...
  • Page 54: Front Panel Description

    Model 335. The number pad keys are dual function keys. If the instrument is in the number entry mode, the keys are used to enter numbers. If it is in normal operating mode, the number keys provide menu entry points.
  • Page 55: Annunciators

    4.2.2 Annunciators 4.2.2 Annunciators LED annunciators: two blue and two red LED annunciators are included to provide visual feedback of the following operation. Function Refer to section The Remote LED is on steady when instrument is in Remote mode (may be controlled via the Remote 4.6.2.1 Remote/Local key).
  • Page 56: Display Setup

    Model 335, which 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.
  • Page 57: Two Loop Mode

    4.3.1 Display Modes FIGURE 4-3 Left: Two Input, Loop A, showing input A and its associated information monitored; Right: Two Input, Loop B showing input B and its associated information monitored Menu Navigation: Display SetupQ Display Mode (Two Input Loop A, Two Input Loop B, Default: Custom Interface Command: DISPLAY 4.3.1.2 Two Loop Mode...
  • Page 58: Custom Display Mode

    Output 1 or Output 2: this option displays the output number, followed by the heater output percentage, and the heater range of the specified output. FIGURE 4-6 Custom display modes Menu Navigation: Display SetupQDisplay Mode (Custom) Interface Command: DISPLAY Model 335 Temperature Controller...
  • Page 59: Display Brightness

    (option 3060 only) Type K (Chromel-Alumel), Type T (Copper-Constantan) *Refer to the Lake Shore Temperature Measurement and Control Catalog for details on Lake Shore temperature sensors. TABLE 4-6 Sensor input types Menu Navigation: Input SetupQInput (A, or B) QSensor Type (Disabled, Diode, PTC RTD [Platinum], NTC...
  • Page 60: Diode Sensor Input Setup

    PTC resistor sensors include the platinum and rhodium-iron sensors detailed in  4.4.2 Positive TABLE 4-6. More detailed specifications are provided in TABLE 1-2. The Model 335 Temperature supplies a 1 mA excitation current for the PTC resistor sensor type. A resistance range Coefficient (PTC) selection is available in order to achieve better reading resolution.
  • Page 61: Range Selection

    EMF voltages can be an appreciable part of a low  voltage sensor measurement. The Model 335 can help with a thermal compensation algorithm. The instrument will automatically reverse the polarity of the current source every other reading. The average of the positive and negative sensor readings will cancel the thermal EMF voltage that is present in the same polarity, regardless of current direction.
  • Page 62: Thermocouple Sensor Input Setup (Model 3060 Only)

    Default: On Interface Command: INTYPE 4.4.6 Thermocouple When a Model 3060 thermocouple option is installed in the Model 335, a thermocou- ple option becomes available under the Sensor Type parameter in the Input Setup Sensor Input Setup menu. The standard diode/RTD sensor inputs can still be used when the thermocou-...
  • Page 63: Curve Selection

    The Model 335 supports a 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 335 can use curves from several sources. Standard curves are preloaded with every instrument, and they are numbered 1 to 20.
  • Page 64: Filter

    User curves — — — — * No longer offered by Lake Shore **Instrument may not support the sensor over its entire range TABLE 4-8 Sensor curves Once the input is configured (section 4.4), you may choose a temperature curve. Any...
  • Page 65: Input Sensor Name

    Filter WindowQ10% Interface: FILTER 4.4.9 Input Sensor 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 Name on the front panel when the A or B keys are pressed, identifying the respective sensor.
  • Page 66: Preferred Units

    The power ranges for each output provide decade steps in power. Menu Navigation: Output SetupQOutput (1 or 2) Default: Current Interface: HTRSET Model 335 Temperature Controller...
  • Page 67: Heater Output Type (Output 2)

    Interface: HTRSET 4.5.1.3 Max Current and Heater Resistance The Model 335 heater outputs are designed to work optimally into a 25 ) or 50 ) heater. The Heater Resistance and Max Current parameters work together to limit the maximum available power into the heater. This is useful for preventing heater dam- age or limiting the maximum heater power into the system.
  • Page 68: User Max Current

    Example 1: A 50 ), 30 W heater is connected to Output 1. Power lLimit Voltage compliance limit I = Squrt(P/R) I = V/R I = Squrt(30 W/50 )) I = 50 V/50 ) I = 0.77 A I = 1 A Model 335 Temperature Controller...
  • Page 69: Power Up Enable

    Interface: HTRSET 4.5.1.4 Power Up Enable All configuration parameters of the Model 335 can be retained through a power cycle. Some systems require that the heater range is turned off when power is restored. The power up enable feature allows the user to choose whether or not the heater range is turned off each time the instrument power is cycled.
  • Page 70: Heater Out Display

    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 335. In this mode the controller attempts to keep the load exactly at the setpoint temperature you entered.
  • Page 71: Open Loop Mode

    4.5.1 Heater Outputs The control algorithm used for each zone is identical to that used in Closed Loop PID mode. The Zone feature is useful by itself, but it is even more powerful when used with other features. We recommend using zone mode with setpoint ramping (section 4.5.1.7.7).
  • Page 72: Proportional (P)

    Refer to section 4.3 for details on configuring the front panel display. Menu Navigation: IQ(0 to 1000) Default: 20 Interface Command: PID Model 335 Temperature Controller...
  • Page 73: Derivative (D)

    1/i the integral time in seconds, if used at all. As a convenience to the operator, the Model 335 derivative time constant is expressed in percent of ¼ the integral time. The range is between 0% and 200%. Start with settings of 0%, 50%, or 100%, and determine which setting gives you the type of control you desire.
  • Page 74: Setpoint

    For these applications, the Model 335 can control temperature in sensor units. To control in sensor units, set the Preferred Units parameter to sensor. When controlling in sensor units, the Setpoint resolution matches the display resolution for the sensor input type given in the speci- fications (section 1.3).
  • Page 75: Setpoint Ramping

    4.5.1 Heater Outputs 4.5.1.7.7 Setpoint Ramping The Model 335 can generate a smooth setpoint ramp when the setpoint units are expressed in temperature. You can set a ramp rate in degrees per minute with a range of 0 to 100 and a resolution of 0.1. Once the ramping feature is turned on, its action is initiated by a setpoint change.
  • Page 76: Heater Range

    The Monitor Out mode uses the output to provide a voltage proportional to an input sensor reading to be used by an external device such as a data logger. Model 335 Temperature Controller...
  • Page 77: Warm Up Supply

    Chapter 6 for details on computer interface operation. 4.6.2.1 Remote/Local Local refers to operating the Model 335 from the front panel. Remote refers 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.
  • Page 78 To unlock the keypad, 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 Unlocked *** will be displayed for 3 s and the display will return to normal. All Model 335 parameters are now accessible.
  • Page 79: Chapter 5 5.1 General

    5.1 General Chapter 5: Advanced Operation 5.1 General This chapter provides information on the advanced operation of the Model 335 tem- perature controller. 5.2 Autotune The Model 335 can automate the tuning process of typical cryogenic systems with the Autotune feature. For additional information about the algorithm refer ...
  • Page 80  stage of PI and PID Autotuning tem to Autotune heater range control parameters TABLE 5-1 Autotune stages Menu Navigation: AutotuneQInput (A, B)Q(Autotune P, Autotune PI, Autotune PID) Interface Command: ATUNE Model 335 Temperature Controller...
  • Page 81 5.3 Zone Settings 5.3 Zone Settings The Model 335 allows you to establish up to ten custom contiguous temperature zones where the controller will automatically use pre-programmed values for PID, heater range, manual output, ramp rate, and control input. Zone control can be active for both control loops at the same time.
  • Page 82 Upper boundary: Proportional Integral Derivative MHP Output Ramp Rate Heater Range Control Input A Off A Med A Default (0.1–1000) (0.1–1000) (0–200) (0–100%) (0.1–100 K/min) Zone 01 A Low A High FIGURE 5-2 Record of zone settings Model 335 Temperature Controller...
  • Page 83: Bipolar Control

    For these types of bipolar devices, the Model 335 features a bipolar control mode. In this mode, the Model 335 is configured to drive these devices to control temperature using Output 2 in Voltage mode.
  • Page 84: Warm Up Percentage

    Heater Range setting, and by design is always enabled. Menu Navigation: Output SetupQOutput 2 QOutput Type (Voltage)QOutput Mode (Monitor Out)Q Control Input (None, Input A, Input B) Default: Control InputQNone Interface Command: OUTMODE Model 335 Temperature Controller...
  • Page 85: Monitor Units

    5.6.1 Monitor Units 5.6.1 Monitor Units The Monitor Units parameter determines the units of the Control Input sensor to use for creating the proportional voltage output. The Monitor Out scaling parameter set- tings will be entered using the units chosen for this parameter. Menu Navigation: Output SetupQOutput 2QOutput Type (Voltage)QOutput Mode (Monitor Out)Q Control Input (None, Input A, Input B)QMonitor Out Units (Kelvin, Celsius, or Sensor)
  • Page 86: Alarms And Relays

    The two relays on the Model 335 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 trigger a relay.
  • Page 87: Alarm Latching

    5.7.1 Alarms 5.7.1.2 Alarm Latching Latching Alarms: often used to detect faults in a system or experiment that requires operator intervention. The alarm state remains visible to the operator for diagnostics even if the alarm condition is removed. Relays often signal remote monitors, or for added safety take critical equipment off line.
  • Page 88: Relays

    HAPTER 5.7.2 Relays There are two relays on the Model 335 numbered 1 and 2. They are most commonly thought of as alarm relays, but they may be manually controlled also. Relay assign- ments are configurable as shown in FIGURE 5-7. Two relays can be used with one sen- sor input for independent high and low operation, or each can be assigned to a ...
  • Page 89: Curve Numbers And Storage

    5.8 Curve Numbers and Storage 5.8 Curve The Model 335 has 20 standard curve locations, numbered 1 through 20. At present, not all locations are occupied by curves; the others are reserved for future updates. If Numbers and a standard curve location is in use, the curve can be viewed using the view operation.
  • Page 90: Front Panel Curve Entry Operations

    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.
  • Page 91: Edit A Breakpoint Pair

    5.9.1 Edit Curve If the curve you wish to enter has similar parameters as an existing curve, first copy the similar curve (as described in Section 5.2.4) to a new location, then edit the curve to the desired parameters. To perform the Edit Curve operation, follow this procedure: 1.
  • Page 92: Add A New Breakpoint Pair

    To convert curves published in Celsius to kelvin, add 273.15 to the temperature in Celsius. The input voltage of the Model 335 is limited to ±50 mV, so any part of the curve that extends beyond ±50 mV is not usable by the instrument.
  • Page 93: Erase Curve

    Both DT-400 Series and platinum SoftCal™ algorithms require a standard curve that is already present in the Model 335. When you enter the type of sensor being cali- brated, select the correct standard curve. When calibration is complete, assign the new curve to an input.
  • Page 94: Softcal™ With Silicon Diode Sensors

    Lake Shore for best accuracy. The calibration points can be entered into the Model 335 so it can generate a curve. If the CalCurve™ service is purchased with the calibrated sensor, the curve is also generated at the factory and can be entered like any other curve.
  • Page 95: Softcal™ Accuracy With Dt-400 Series Silicon Diode Sensors

    77.35 K (liquid nitrogen), and 305 K (room temperature) points. If you are performing Series Silicon Diode the SoftCal™ with Lake Shore instruments, note that the boiling point of liquid cryo- Sensors gen, though accurate, is affected by atmospheric pressure. Use calibrated standard sensors if possible.
  • Page 96: Softcal™ Accuracy With Platinum Sensors

    SoftCal™ assume ±0.05 K for 77.35 K (liquid nitrogen) and 305 K Accuracy With (room temperature) points. If you are performing the SoftCal™ with Lake Shore Platinum Sensors instruments, note that the boiling point of liquid cryogen, though accurate, is affected by atmospheric pressure.
  • Page 97: Emulation Modes

    5.11.1 Emulation Mode To assist in the ease of replacing a Model 331 or a Model 332 with a Model 335, cer- tain hardware settings are automatically configured when the Emulation mode is set Configuration to Model 331 or Model 332.
  • Page 98: Unsupported Commands

    Model 335 setting, for full compatibility with the Model 331 or the Model 332. Some settings will not directly apply to the Model 335, such as the Auto- tune control modes. Attempts to set an inapplicable setting will be ignored.
  • Page 99: Hardware Differences

    100 ) heater. The Model 332 provides a ±10 V voltage source output with 1 A maxi- mum current, providing up to 10 W into a 10 ) heater. The Model 335 provides both a ±10 V voltage source with 100 mA maximum current, which is the exact same hard-...
  • Page 100 5: Advanced Operation HAPTER Model 335 Temperature Controller...
  • Page 101: General

    Cable lengths are limited to 2 m (6.6 ft) for each device and 20 m (65.6 ft) for the entire bus. The Model 335 can drive a bus with up to ten loads. If more instruments or cable length is required, a bus expander must be used.
  • Page 102: Remote/Local Operation

    LLO (Local Lockout): prevents the use of instrument front panel controls DCL (Device Clear): clears Model 335 interface activity and puts it into a bus idle state Finally, addressed bus control commands are multiline commands that must include the Model 335 listen address before the instrument responds.
  • Page 103: Common Commands

    Most device specific com- mands also work if performed from the front panel. Model 335 device specific com- mands are detailed in section 6.4.1 and summarized in TABLE 6-6.
  • Page 104: Status System Overview

    6: Computer Interface Operation HAPTER 6.2.4 Status System The Model 335 implements a status system compliant to the IEEE-488.2 standard. The status system provides a method of recording and reporting instrument informa- Overview tion and is typically used to control the Service Request (SRQ) interrupt line. A dia- gram of the status system is shown in FIGURE 6-1.
  • Page 105 CAL = Calibration error ATUNE = Autotune process completed NRDG = New sensor reading RAMP1 = Loop 1 ramp done RAMP2 = Loop 2 ramp done OVLD = Sensor overload ALARM = Sensor alarming FIGURE 6-1 Model 335 status system www.lakeshore.com...
  • Page 106: Status Byte Register

    To program an enable  register, send a decimal value that corresponds to the desired binary-weighted sum of all bits in the register (TABLE 6-2). The actual commands are described throughout (section 6.4.1). Model 335 Temperature Controller...
  • Page 107: Clearing Registers

    Register clear methods 6.2.5 Status System As shown in FIGURE 6-1, there are two register sets in the status system of the Model 335: Standard Event Status Register and Operation Event Register. Detail: Status Register Sets 6.2.5.1 Standard Event Status Register Set...
  • Page 108: Operation Event Register Set

    Sensor Overload (OVLD), Bit (1): this bit is set when a sensor reading is in the over- load condition Alarming (ALARM), Bit (0): this bit is set when an input is in an alarming state, and the Alarm Visible parameter is on Model 335 Temperature Controller...
  • Page 109: Status System Detail: Status Byte Register And Service Request

    6.2.6 Status System Detail: Status Byte Register and Service Request – Bit Operation – Decimal condition register OPST? ATUNE NRDG RAMP1 RAMP2 OVLD ALARM – Name – Bit Operation event register – Decimal OPSTR? ATUNE NRDG RAMP1 RAMP2 OVLD ALARM –...
  • Page 110: Service Request Enable Register

    The serial poll does not clear MSS. The MSS bit stays set until all enabled Status Byte summary bits are cleared, typically by a query of the associated event register  (section 6.2.6.4). The programming example in TABLE 6-4 initiates an SRQ when a command error is detected by the instrument. Model 335 Temperature Controller...
  • Page 111: Using Status Byte Query (*Stb?)

    The bus controller can, for example, send a query command to the Model 335 and then wait for MAV to set. If the MAV bit has been enabled to initiate an SRQ, the user's program can direct the bus controller to look for the SRQ leaving the bus available for other use.
  • Page 112: Usb Interface

    USB peripheral devices, and it allows the common USB A-type to Connection B-type cable to be used to connect the Model 335 to a host PC. The pin assignments for A-type and B-type connectors are shown in section 8.10. The maximum length of a USB cable, as defined by the USB 2.0 standard, is 5 m (16.4 ft).
  • Page 113: Installing The Driver From Windows® Update In Windows® Xp

    If the Found New Hardware wizard is unable to connect to Windows® Update or find the drivers, a message to “Insert the disc that came with your Lake Shore Model 335” will be displayed. Click Cancel and refer to section 6.3.3.3 to install the driver from the web.
  • Page 114: Manually Install The Driver

    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 automatically.
  • Page 115: Installing The Usb Driver From The Included Cd

    + icon. Lake Shore Model 335 should appear indented underneath Ports (COM & LPT). 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 select Scan for hardware changes, which may open the Found New Hardware wizard automatically.
  • Page 116: Communication

    A special ASCII character, line feed (LF 0AH), is used to indicate the end of a mes- sage string. This is called the message terminator. The Model 335 will accept either the line feed character alone, or a carriage return (CR 0DH) followed by a line feed as the message terminator.
  • Page 117: Command Summary

    6.4 Command Summary When issuing commands the user program alone should: Properly format and transmit the command including the terminator as one string Guarantee that no other communication is started for 50 ms after the last char- acter is transmitted Not initiate communication more than 20 times/s When issuing queries or queries and commands together, the user program should: Properly format and transmit the query including the terminator as one string...
  • Page 118 Warmup Supply Parameter Query IEEE? IEEE-488 Interface Parameter Query ZONE Control Loop Zone Table Parameter Cmd INCRV Input Curve Number Cmd ZONE? Output Zone Table Parameter Query INCRV? Input Curve Number Query TABLE 6-6 Command summary Model 335 Temperature Controller...
  • Page 119: Interface Commands

    6.4.1 Interface Commands 6.4.1 Interface This section lists the interface commands in alphabetical order. Commands  Begins common interface command Required to identify queries String of alphanumeric characters with length “n.” Send these strings using surrounding quotes. Quotes enable characters such as commas s[n] and spaces to be used without the instrument interpreting them as delimiters.
  • Page 120 Places a 1 in the controller 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 RST[term] Input Remarks Sets controller parameters to power-up settings. Model 335 Temperature Controller...
  • Page 121 Returned <status>[term] Format <status> 0 = no errors found, 1 = errors found Remarks The Model 335 reports status based on the test done at power up. WAI Wait-to-Continue Command WAI[term] Input Remarks Causes the IEEE-488 interface to hold off until all pending operations have been com- pleted.
  • Page 122 <high state> 0 = Off, 1 = On <low state> 0 = Off, 1 = On ALMRST Reset Alarm Status Command Input ALMRST[term] Remarks Clears both the high and low status of all alarms, including latching alarms. Model 335 Temperature Controller...
  • Page 123 Output 2 is the only valid entry and must be included (included for com- patibility with other Lake Shore temperature instruments). 2 = Output 2 Specifies which input to monitor. 0 = none, 1 = Input A, 2 =Input B ...
  • Page 124 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 <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) Model 335 Temperature Controller...
  • Page 125 The 10 µA excitation current is the only calibrated excitation current, and is used in almost all applications. Therefore the Model 335 will default the 10 µA current set- ting any time the input sensor type is changed in order to prevent an accidental change.
  • Page 126 7=Two Loop When the input display mode is set to Custom, use the DISPFLD command to  Remarks configure the display. DISPLAY? Display Setup Query Input DISPLAY?[term] <mode>[term] Returned Format n (refer to command for description) Model 335 Temperature Controller...
  • Page 127 (Sensor) Remarks The 331 and 332 emulation modes provide a means of using the Model 335 in place of a Model 331 or 332 in a software controlled system without updating the software. The emulation mode setting only affects remote operation; front panel operation of the Model 335 is not changed.
  • Page 128 IEEE IEEE-488 Interface Parameter Command Input IEEE <address>[term] Format <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. Model 335 Temperature Controller...
  • Page 129 6.4.1 Interface Commands IEEE? IEEE-488 Interface Parameter Query Input IEEE?[term] Returned <address>[term] Format nn (refer to command for description) INCRV Input Curve Number Command Input INCRV <input>,<curve number>[term] Format a,nn <input> Specifies which input to configure: A or B. <curve number> Specifies which curve the input uses. If specified curve type does not  match the configured input type, the curve number ...
  • Page 130 INTYPE? <input>[term] Format <input> Specifies input to query: A or B. Returned <sensor type>,<autorange>,<range>,<compensation>,<units> [term] Format n,n,n,n,n (refer to command for description) Remarks If autorange is on, the returned range parameter is the currently auto-selected range. Model 335 Temperature Controller...
  • Page 131 6.4.1 Interface Commands KRDG? Kelvin Reading Query Input KRDG? <input>[term] Format <input> Specifies which input to query: A –B. Returned <kelvin value>[term] Format ±nnnnnn Remarks Also see the RDGST? query. LEDS Front Panel LEDS Command Input LEDS <off/on>[term] Format <off/on> 0 = LEDs Off, 1 = LEDs On If set to 0, front panel LEDs will not be functional.
  • Page 132 Remote Interface Mode Command Input MODE <mode>[term] Format <mode> 0 = local, 1 = remote, 2 = remote with local lockout. Example MODE 2[term] places the Model 335 into remote mode with local lockout. MODE? Remote Interface Mode Query Input MODE?[term] Returned <mode>[term]...
  • Page 133 6.4.1 Interface Commands OPSTR? Operational Status Register Query Input OPSTR? [term] Returned <bit weighting> [term] Format Remarks The integers returned represent the sum of the bit weighting of the operational sta- tus bits. These status bits are latched when the condition is detected. This register is cleared when it is read.
  • Page 134 RAMPST? Control Setpoint Ramp Status Query Input RAMPST? <output>[term] Format <output> Specifies which output’s control loop to query: 1 or 2. Returned <ramp status>[term] Format <ramp status> 0 = Not ramping, 1 = Setpoint is ramping. Model 335 Temperature Controller...
  • Page 135 6.4.1 Interface Commands RANGE Heater Range Command Input RANGE <output>,<range>[term] Format <output> Specifies which output to configure: 1 or 2. For Outputs 1 and 2 in Current mode: 0 = Off, 1 = Low,  <range> 2 = Medium, 3 = High For Output 2 in Voltage mode: 0 = Off, 1 = On Remarks The range setting has no effect if an output is in the Off mode, and does not apply to...
  • Page 136 SETP? Control Setpoint Query Input SETP? <output>[term] Format <output> Specifies which output to query: 1 or 2. Returned <value>[term] Format ±nnnnnn (refer to command for description) Model 335 Temperature Controller...
  • Page 137 6.4.1 Interface Commands SRDG? Sensor Units Input Reading Query Input SRDG? <input>[term] Format <input> Specifies which input to query: A or B. Returned <sensor units value>[term] Format ±nnnnnn Remarks Also see the RDGST? command. TEMP? Thermocouple Junction Temperature Query Input TEMP?[term] Returned <junction temperature>[term]...
  • Page 138 Specifies which heater output to query: 1 or 2. Specifies which zone in the table to query.  <zone> Valid entries: 1–10. Returned < upper boundary>,<P value>,<I value>,<D value>,<mout value>,<range>,<input>,<rate>[term] +nnnnn,+nnnnn,+nnnnn,+nnnn, +nnnnn,n,n, +nnnn  Format (refer to command for description) Model 335 Temperature Controller...
  • Page 139: Chapter 7 7.1 General

    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 335 is as follows: Model Description of Accessories 106-009*†...
  • Page 140 Half-rack mounting kit for one Model 335 temperature controller. Half-length mounting panel RM-½ and mounting ears to attach one Model 335 to a 483 mm (19 in) rack mount space. See FIGURE 7-2. Dual mounting shelf for two Model 335 temperature controllers. Mounting shelf to attach any RM-2 two 5.25 in tall half-rack instruments side-by-side on a 483 mm (19 in) rack mount shelf.
  • Page 141: Rack Mounting

    10 ft: P/N 112-177, 20 ft: P/N 112-178, 33 ft: P/N 112-180 7.4 Rack Mounting The Model 335 can be installed into a 483 mm (19 in) rack mount cabinet using the optional Lake Shore Model RM-½ 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...
  • Page 142: Model 3060-H Thermocouple Input Option

    Input Option used to measure thermocouple temperature sensors. Calibration for the option is stored on the card so it can be installed in the field and used with multiple Model 335 temperature controllers without recalibration. Model 335 Temperature Controller...
  • Page 143: Chapter 8 8.1 General

    Lockups not being overloaded. 3. Ensure that the USB cable is not unplugged and that the Model 335 is not pow- ered down while the com port is open. The USB driver creates a com port when the USB connection is detected, and removes the com port when the USB connec- tion is no longer detected.
  • Page 144: Ieee Interface Troubleshooting

    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.
  • Page 145: Fuse Replacement

    8.6 Fuse Replacement FIGURE 8-2 Power fuse access 8.6 Fuse Use this procedure to remove and replace a line fuse. Replacement To avoid potentially lethal shocks, turn off the controller and disconnect it from AC power before performing these procedures. For continued protection against fire hazard, replace the fuse only with the same fuse type and rating specified for the line voltage selected.
  • Page 146: Factory Reset Menu

    Input B Range Location 2 units Kelvin Ramp rate 0.100 K/min Location 3 source Setpoint 1 Control input Default Location 3 units Kelvin Location 4 source Output 1 Location 4 units Kelvin Brightness TABLE 8-1 Default values Model 335 Temperature Controller...
  • Page 147: Product Information

    The calibration memory is either corrupt, or is at the default, uncalibrated state. This **Invalid Cal** message appears when the Model 335 is first powered on. To clear the message, and Press Escape & Enter continue with instrument start-up, press Escape and Enter simultaneously.
  • Page 148: Rear Panel Connector Definition

    FIGURE 3-7. Definition FIGURE 8-3 Sensor input A and B Symbol Description I– –Current V– –Voltage None Shield +Voltage +Current None Shield TABLE 8-3 Sensor input A and B connector details FIGURE 8-4 Heater output connectors Model 335 Temperature Controller...
  • Page 149 8.10 Rear Panel Connector Definition FIGURE 8-5 Terminal block for relays and Output 2 voltage Description Output 2+ Output 2– Relay 1 normally closed Relay 1 common Relay 1 normally open Relay 2 normally closed Relay 2 common Relay 2 normally open TABLE 8-4 Terminal block pin and connector details...
  • Page 150: Ieee-488 Interface Connector

    The total length of cable allowed in a system is 2 m for each device on the bus, or 20 m maximum. The Model 335 can drive a bus of up to 10 devices. A connector extender is required to use the IEEE-488 interface and relay terminal block at the same time. ...
  • Page 151: Electrostatic Discharge

    8.11 Electrostatic Discharge 8.11 Electrostatic Electrostatic Discharge (ESD) may damage electronic parts, assemblies, and equip- ment. ESD is a transfer of electrostatic charge between bodies at different electro- Discharge 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.
  • Page 152 Follow ESD procedures in section 8.11 to avoid inducing an electrostatic discharge (ESD) into the device. 1. Turn the Model 335 power switch Off. Unplug the power cord from the wall out- let, then the instrument. 2. Stand the unit on its face. Use the hex driver to remove the four screws on both sides of the top cover;...
  • Page 153: Firmware Updates

    This section provides instructions for updating the firmware in your instrument. Updates 8.13.1 Updating the 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 Firmware this procedure.
  • Page 154: Technical Inquiries

    Questions regarding product applications, price, availability and Inquiries shipments should be directed to sales. Questions regarding instrument calibration or repair should be directed to instrument service. Do not return a product to Lake Shore without a Return Material Authorization (RMA) number (section 8.14.2). 8.14.1 Contacting 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.
  • Page 155: Shipping Charges

    8.14.4 Shipping Charges 8.14.4 Shipping All shipments to Lake Shore are to be made prepaid by the customer. Equipment serviced under warranty will be returned prepaid by Lake Shore. Equipment serviced Charges 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.
  • Page 156 8: Service HAPTER Model 335 Temperature Controller...
  • Page 157 Appendix A: Temperature Scales A.1 Definition Temperature is a fundamental unit of measurement that describes the kinetic and potential energies of the atoms and molecules of bodies. When the energies and velocities of the molecules in a body are increased, the temperature is increased whether the body is a solid, liquid, or gas.
  • Page 158 20.33 -6.48 266.67 -309.67 -189.82 83.33 -140 -95.96 177.59 26.33 -3.15 -300 -184.44 88.71 -139.67 -95.37 177.78 -1.11 272.04 -299.67 -184.26 88.89 -135.67 -93.15 30.33 -0.93 272.22 -297.67 -183.15 -130 183.15 273.15 TABLE A-1 Temperature conversions Model 335 Temperature Controller...
  • Page 159 Use of liquid helium (LHe) and liquid nitrogen (LN ) is often associated with the Model 335 temperature controller. Although not explosive, there are a number of safety considerations to keep in mind in the handling of LHe and LN B.2 Properties...
  • Page 160 15 minutes. In case of massive exposure, remove clothing while showering with warm water. The patient should not drink alcohol or smoke. Keep warm and rest. Call a physician immediately. Model 335 Temperature Controller...
  • Page 161 Appendix C: Curve Tables Standard curve tables included in the Model 335 temperature controller are  C.1 General as follows: Curve Location Model Table Curve 01 DT-470 Silicon Diode Table C-2 Curve 02 DT-670 Silicon Diode Table C-3 Curve 03 & 04...
  • Page 162 1.11160 029.0 1.11500 028.0 1.11900 028.0 1.12390 027.0 1.13080 027.0 1.13650 026.0 1.14860 026.0 1.15590 025.0 1.17200 025.0 1.18770 023.0 1.25070 024.0 1.23570 TABLE C-4 Lake Shore DT-500 series silicon diode curves (no longer in production Model 335 Temperature Controller...
  • Page 163 009.0 2.11720 004.0 2.53640 003.0 2.53660 003.0 2.59940 001.4 2.59840 001.4 2.65910 TABLE C-4 Lake Shore DT-500 series silicon diode curves (no longer in production PT-100 PT-1000 Breakpoint Temp (K) Ohms ()) Temp (K) Ohms ()) 030.0 3.820 030.0 38.20 032.0...
  • Page 164 0.162 3.04569 15.65 3.14913 3.75 4.14432 0.127 3.04685 15.20 3.15454 3.58 4.34126 0.091 3.04807 14.75 3.16002 3.42 4.54568 0.066 3.04936 14.30 3.16593 3.26 4.79803 0.050 3.05058 13.90 3.17191 3.11 TABLE C-6 Lake Shore RX-102A Rox™ curve Model 335 Temperature Controller...
  • Page 165 3.39345 14.40 3.49421 3.03 4.57858 0.067 3.39516 13.90 3.49894 2.88 4.76196 0.055 3.39695 13.40 3.50406 2.73 4.79575 0.051 3.39882 12.90 3.50962 2.58 4.81870 0.050 3.40079 12.40 3.51528 2.44 3.40286 11.90 3.52145 2.30 TABLE C-7 Lake Shore RX-202A Rox™ curve www.lakeshore.com...
  • Page 166 -3.58873 13.7844 48.6868 1469 -6.19115 50.2 -3.46638 14.5592 629.5 49.1426 1481.5 -6.17142 -3.34204 15.3786 49.5779 1493.5 -6.15103 53.8 -3.21584 16.2428 669.5 50.0111 1505.5 -6.12998 55.6 -3.08778 17.1518 TABLE C-8 Type K (Nickel-Chromium vs. Nickel-Aluminum) thermocouple curve Model 335 Temperature Controller...
  • Page 167 Breakpoint Temp (K) Breakpoint Temp (K) Breakpoint Temp (K) -9.834960 3.15 -8.713010 77.50 0.701295 285.0 -9.834220 3.59 -8.646710 80.00 1.061410 291.00 -9.833370 4.04 -8.578890 82.50 1.424820 297.00 -9.832260 4.56 -8.509590 85.00 1.791560 303.00 -9.830920 5.12 -8.438800 87.50 2.161610 309.00 -9.829330 5.72 -8.366570 90.00...
  • Page 168 71.50 -0.407776 262.50 19.1116 644.50 -5.589590 74.00 -0.217705 267.50 19.7538 655.00 -5.549510 76.50 -0.025325 272.50 20.4611 666.50 -5.508560 79.00 0.188573 278.00 20.8627 673.00 -5.466760 81.50 0.404639 283.50 TABLE C-10 Type T (Copper vs. Copper-Nickel) thermocouple curve Model 335 Temperature Controller...
  • Page 169 Breakpoint Temp (K) Breakpoint Temp (K) -4.6667 -2.24537 -4.62838 6.35 -2.06041 -4.60347 8.15 -1.86182 180.5 -4.58043 9.75 -1.66004 -4.53965 12.5 -1.47556 200.5 -4.47226 16.95 -1.0904 -4.43743 19.3 -0.73397 237.5 -4.39529 22.2 -0.68333 -4.34147 -0.3517 -4.29859 29.1 -0.2385 261.5 -4.26887 31.3 0.078749 -4.22608 34.5...
  • Page 170 7.260420 591.00 -3.729910 94.50 0.542973 297.50 7.412010 597.50 -3.655230 98.50 0.598604 300.00 7.529070 602.50 -3.579930 102.50 0.774384 308.00 7.657460 608.00 -3.504020 106.50 0.840638 311.00 7.704410 610.00 -3.427530 110.50 1.126350 324.00 TABLE C-12 Chromel-AuFe 0.07% thermocouple curve Model 335 Temperature Controller...

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