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Lake Shore 218S User Manual

Temperature monitor
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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.
Revision 2.2
User's Manual
Model 218
Temperature Monitor
Includes Coverage For:
Model 218S and Model 218E
Lake Shore Cryotronics, Inc.
575 McCorkle Blvd.
Westerville, Ohio 43082-8888 USA
Internet Addresses:
sales@lakeshore.com
service@lakeshore.com
Visit Our Website:
www.lakeshore.com
Fax: (614) 891-1392
Telephone: (614) 891-2243
P/N 119-007
03 July 2012

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  • Page 1 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 DuPont De Nemours. Copyright © 1998 – 2004, 2009 and 2012 by 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,...

  • Page 3: Declaration Of Conformity

    Lake Shore Model 218 Temperature Monitor User’s Manual DECLARATION OF CONFORMITY Lake Shore Cryotronics, Inc. 575 McCorkle Blvd. Westerville OH 43082-8888 USA hereby declare that the equipment specified conforms to the following Directives and Standards: Application of Council Directives: ......73/23/EEC 89/336/EEC Standard to which Conformity is declared: ....
  • Page 4 Lake Shore Model 218 Temperature Monitor User’s Manual Electromagnetic Compatibility (EMC) for the Model 218 Temperature Monitor Electromagnetic Compatibility (EMC) of electronic equipment is a growing concern worldwide. Emissions of and immunity to electromagnetic interference is now part of the design and manufacture of most electronics.

  • Page 5: Table Of Contents

    Lake Shore Model 218 Temperature Monitor User’s Manual TABLE OF CONTENTS Chapter/Paragraph Title Page INTRODUCTION ............................ 1-1 GENERAL ........................... 1-1 MODEL 218 FEATURES ....................1-3 MODEL 218 SPECIFICATIONS ..................1-4 SAFETY ..........................1-6 1.3.1 Handling Liquid Helium and Liquid Nitrogen ..............1-6 1.3.2...
  • Page 6 Lake Shore Model 218 Temperature Monitor User’s Manual TABLE OF CONTENTS (Continued) Chapter/Paragraph Title Page INPUT TYPE........................4-5 4.5.1 Optimizing the Update Rate ..................... 4-7 CURVE SELECT ......................... 4-7 MATH ........................... 4-8 4.7.1 Max/Min ..........................4-8 4.7.2 Linear ..........................4-9 4.7.3...
  • Page 7 7.13.12 5 kΩ Input Gain Calibration ................... 7-13 7.13.13 Calibrate Input Group B ....................7-13 7.13.14 Analog Output Calibration and Test (Model 218S Only) ..........7-13 7.13.15 Calibration Specific Interface Commands ..............7-14 ACCESSORIES ............................8-1 GENERAL ........................... 8-1 MODELS ..........................8-1 OPTIONS ..........................
  • Page 8 Lake Shore Model 218 Temperature Monitor User’s Manual LIST OF ILLUSTRATIONS Figure No. Title Page Cryogenic Storage Dewar ....................... 1-5 Silicone Diode Sensor Calibrations and CalCurve™ ..............2-3 Typical Sensor Installation in a Mechanical Refrigerator ..............2-5 Model 218 Rear Panel ........................3-2 Line Input Assembly ........................

  • Page 9: Introduction

    The monitor’s low noise, high resolution and wide operating range make it ideal for noncryogenic applications as well. There are two versions of the Model 218, the Model 218S and Model 218E. Both versions have the same sensor measurement and display capabilities but include different interfaces.

  • Page 10: Supported Lake Shore Sensors

    Lake Shore Model 218 Temperature Monitor User’s Manual Table 1-1. Supported Lake Shore Sensors Type Model Temp. Range Diodes Silicon Diode DT-670-SD 1.4 K to 500 K Silicon Diode DT-670E-BR 30 K to 500 K Silicon Diode DT-414 1.4 K to 375 K...

  • Page 11: Model 218 Features

    Shore are limited to 800 K (527 °C). Diode Measurements The Model 218 can read up to eight Lake Shore DT-470 or any other diode temperature sensor. Diode sensors are easily interchangeable and provide a wide measurement range from 1.4 to 475 K.

  • Page 12: Model 218 Specifications

    Lake Shore Model 218 Temperature Monitor User’s Manual MODEL 218 SPECIFICATIONS Thermometry Number of Inputs: Input Configuration: Two groups of four. Each group must contain same input type Measurement Type: Four-lead differential Excitation: Eight constant current sources Supported Sensors (temp. range): Silicon Diode, GaAlAs Diode, RTDs: 100 Ω Platinum, 1000 Ω Platinum,...

  • Page 13: Model 218 Sensor Input Performance Chart

    Lake Shore Model 218 Temperature Monitor User’s Manual Table 1-2. Model 218 Sensor Input Performance Chart Ω Platinum RTD Ω Sensor Type Silicon Diode GaAlAs Diode 1000 Platinum RTD Cernox™ RTD Ω Full Scale Temperature Coefficient Negative Negative Positive Positive Negative Ω...

  • Page 15: Safety

    Lake Shore Model 218 Temperature Monitor User’s Manual SAFETY 1.3.1 Handling Liquid Helium and Liquid Nitrogen Liquid Helium (LHe) and liquid nitrogen (LN ) may be used in conjunction with the Model 218. Although LHe and LN are not explosive, there are certain safety considerations when handling them.

  • Page 16: Safety Summary

    Do Not Substitute Parts Or Modify Instrument Do not install substitute parts or perform any unauthorized modification to the instrument. Return the instrument to an authorized Lake Shore Cryotronics, Inc. representative for service and repair to ensure that safety features are maintained.

  • Page 17: Sensor Considerations

    Another thing to consider when choosing a temperature sensor is that instruments like the Model 218 are not able to read some sensors over their entire temperature range. Lake Shore sells calibrated sensors that operate down to 50 mK, but the Model 218 is limited to operation above 1 K in its standard configuration.

  • Page 18: Measurement Accuracy

    It can be difficult to choose the right sensor, calibrate it, translate calibration data into a temperature response curve understandable to the Model 218, and load the curve into the instrument. Lake Shore offers a variety of calibration and curve loading services to fit different accuracy requirements and budgets: Traditional Calibration in Paragraph 2.2.1, SoftCal™...

  • Page 19: Standard Curves

    Lake Shore Model 218 Temperature Monitor User’s Manual The Model 218 also performs SoftCal™ calibration. The user provides 1, 2, or 3 known temperature reference points. Calibration range and accuracy depend on these points (Paragraph 5.2). 2.2.3 Standard Curves Some types of sensors behave very predictably and a standard temperature response curve can be created for them.

  • Page 20: Calcurve

    The Lake Shore Temperature Measurement and Control Catalog includes an installation section as well. Lake Shore also offers a line of cryogenic accessories. Many of the materials discussed are available through Lake Shore and can be ordered with sensors or instruments.

  • Page 21: Contact Area

    Lake Shore Model 218 Temperature Monitor User’s Manual 2.3.4 Contact Area Thermal contact area greatly affects thermal conductivity 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.

  • Page 22: Lead Wire

    Lake Shore Model 218 Temperature Monitor User’s Manual 2.3.6 Lead Wire Different types of sensors come with different types and lengths of electrical leads. In general a significant length of lead wire must be added to the sensor for proper heat sinking and connecting to a bulk head connector at the vacuum boundary.

  • Page 23: Installation

    Inspect shipping containers for external damage. Make all claims for damage (apparent or concealed) or partial loss of shipment in writing to Lake Shore within five (5) days from receipt of goods. If damage or loss is apparent, please notify the shipping agent immediately.

  • Page 24: Rear Panel Definition

    3. Sensor Input Connector for Inputs 1–4 ........Paragraph 3.3.2.1 4. Sensor Input Connector for Inputs 5–8 ........Paragraph 3.3.2.1 5. Terminal Block for Relays and Analog Outputs (218S Only) ..Paragraph 3.3.3 6. IEEE-488 INTERFACE Connector (218S Only) ......Paragraph 6.1 Figure 3-1.

  • Page 25: Ac Line Input Definitions

    Lake Shore Model 218 Temperature Monitor User’s Manual 3.3.1.1 Line Voltage The Model 218 has four different AC line voltages configurations so that it can be operated from line power anywhere in the world. The nominal voltage and voltage range of each configuration is shown in Table 3-1.

  • Page 26: Sensor Inputs

    Lake Shore Model 218 Temperature Monitor User’s Manual 3.3.2 Sensor Inputs This section covers Sensor Input Connector and Pinout in Paragraph 3.3.2.1, Sensor Lead Cable in Paragraph 3.3.2.2, Grounding and Shielding Sensor Leads in Paragraph 3.3.2.3, Sensor Polarity in Paragraph 3.3.2.4, Four-Lead Sensor Measurement in Paragraph 3.3.2.5, Two-Lead Sensor Measurement in Paragraph 3.3.2.6, and Lowering Measurement Noise in Paragraph 3.3.2.7.
  • Page 27 3.3.2.4 Sensor Polarity Lake Shore sensors ship 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. They look like an open circuit to the instrument.
  • Page 28 Lake Shore Model 218 Temperature Monitor User’s Manual Four-Lead Sensor Measurement (Continued) In a four lead measurement, current leads and voltage leads run separately to the sensor. With separate leads, there is little current in the voltage leads so their resistance does not enter into the measurement.

  • Page 29: Terminal Block (Model 218S Only)

    3.3.3 Terminal Block (Model 218S only) The terminal block on the Model 218S rear panel contains signals for analog outputs and alarm relays. The terminal block connectors are detachable; remove the top or bottom half from the instrument for convenient wire installation. Use up to 12 AWG stranded copper wire with the terminals.

  • Page 30: Computer Interfaces

    3.3.3.2 Analog Outputs (MODEL 218S only) Analog Output 1 and 2 on the Model 218S rear panel are voltage outputs that can be used for monitor applications (Figure 3-4). Their most basic function is a temperature monitor where they put out a voltage proportional to temperature.

  • Page 31: Operation

    Lake Shore Model 218 Temperature Monitor User’s Manual CHAPTER 4 OPERATION GENERAL This chapter covers Model 218 front panel operation. Display Screen Description in Paragraph 4.1, Keypad Description in Paragraph 4.2, Turning Power On in Paragraph 4.3, Display Setup in Paragraph 4.4, Input Type in Paragraph 4.5, Curve Select in Paragraph 4.6, Math in Paragraph 4.7,...

  • Page 32: Model 218 Normal Display Screen Format

    Lake Shore Model 218 Temperature Monitor User’s Manual Display Screen Description (Continued) F-218-4-2.eps Figure 4-2. Model 218 Normal Display Screen Format Source Annunciators K ........Sensor input data in Kelvin C ........Sensor input data in Celsius V or Ω ....... Sensor input data in sensor units >...

  • Page 33: Keypad Description

    Returns instrument to local operation after remote IEEE-488 operation (218S). Refer to Chapter 6. Interface Sets up the IEEE-488 (218S) or serial computer interface. Refer to Chapter 6. Math Sets up math feature (Max, Min, Linear, and Filter). Also resets Max/Min.

  • Page 34: General Keypad Operation

    Lake Shore Model 218 Temperature Monitor User’s Manual 4.2.1 General Keypad Operation There are three basic keypad operations: Direct Operation, Setting Selection, and Data Entry. Direct Operation is where the key function occurs as soon as the key is pressed. Log On/Off, Local and Alarm Reset operate directly when the key is pressed.

  • Page 35: Input Type

    Escape. Repeat the sequence for other display locations. INPUT TYPE The Model 218 supports a variety of temperature sensors sold by Lake Shore and other manufactures. An appropriate sensor type must be selected for each group of inputs. Refer to Table 4-1 for a list of display messages and common sensor types.

  • Page 36: Sensor Input Type Display Messages

    Lake Shore Model 218 Temperature Monitor User’s Manual Input Type (Continued) Use the Data Selection keys to cycle through the different sensor types for Input group 5-8. When the desired type appears, press Enter. The third display in the setting sequence appears.

  • Page 37: Optimizing The Update Rate

    Users may store a unique 200-point user curve for each of the eight inputs if standard curves are inadequate. CalCurves™ for Lake Shore calibrated sensors store as user curves. User curves can be entered from the front panel or with a computer interface. The built-in SoftCal™ algorithm can also generate improved curves for DT-470 diodes and platinum sensors stored as user curves.

  • Page 38: Math

    Lake Shore Model 218 Temperature Monitor User’s Manual Curve Select (Continued) To select a temperature response curve, press Curve Select. The display below appears. Use the Data Selection keys to cycle through the inputs (1-8) for which to select a temperature response curve.

  • Page 39: Linear

    Lake Shore Model 218 Temperature Monitor User’s Manual Max/Min (Continued) Use the Data Selection keys to select the sensor input (1-8) from which to capture and store the highest (Max) and lowest (Min) reading. Press Enter when the desired input appears. The third display in the Math setting sequence appears.

  • Page 40: Filter

    Lake Shore Model 218 Temperature Monitor User’s Manual Linear (Continued) Press Enter when the desired source appears. In the fifth display of the Math setting sequence, specify the M variable, then press Enter. Resolution is 5 digits (0.0001 to 9999.9).

  • Page 41: Analog Outputs (Model 218S Only)

    Escape. ANALOG OUTPUTS (MODEL 218S ONLY) The Model 218S has two analog voltage outputs numbered 1 and 2. They are commonly configured to send a voltage proportional to temperature to a strip chart recorder or data acquisition system. The outputs can also be manually controlled as a voltage source for any other application.
  • Page 42 Lake Shore Model 218 Temperature Monitor User’s Manual Analog Outputs (Continued) Analog Output Input Mode Select Input to set output voltage proportional to an input reading. Several parameters associated with this mode allow flexibility. After selecting Input mode, the screen to the right appears. Use the Data Selection keys to select the sensor input (1-8) that the selected analog output follows.

  • Page 43: Example Of Low And High Analog Parameter Setting

    If an alarm activates for a particular input, the display location for that input flashes. The beeper inside the instrument can also be programmed to sound if any alarms activate. The eight relays on a 218S can also be tied to alarm functions as described in Paragraph 4.11.
  • Page 44 Lake Shore Model 218 Temperature Monitor User’s Manual Alarms Setup and Operation (Continued) The third display of the setting sequence appears, use the Data Selection keys to cycle through source selections for the selected input. There are four source options: Kelvin temperature reading from input.

  • Page 45: Alarm Reset

    4.11 RELAY SETUP (MODEL 218S ONLY) There are eight relays on the Model 218S numbered 1 to 8. They are most commonly thought of as alarm relays, but may be manually controlled also. Relay assignments are configurable. A relay can be used with any input, it is not necessary for example to use relay one with input one.

  • Page 46: Locking The Keypad

    Lake Shore Model 218 Temperature Monitor User’s Manual 4.12 LOCKING THE KEYPAD The Model 218 keypad lock feature prevents accidental changes to parameter values. When the keypad is locked, some parameter values may be viewed, but most cannot be changed over the front panel. Alarm Reset is the only keypad function that remains active when the keypad is locked.

  • Page 47: Special Features

    FRONT PANEL CURVE ENTRY A unique 200 point user curve can be stored for each of the eight inputs. CalCurves™ for Lake Shore calibrated sensors can be stored as user curves. The built in SoftCal™ algorithm (Paragraph 5.2) uses the same memory space so it is not possible to enter a user curve and SoftCal™...

  • Page 48: Curve Breakpoints

    Lake Shore Model 218 Temperature Monitor User’s Manual 5.1.2 Curve Breakpoints Reduce the temperature response data of a calibrated sensor to a table of breakpoints before entering it into the instrument. Each breakpoint consists of a value in sensor units and a corresponding temperature value in Kelvin.

  • Page 49: Entering A New Curve

    Lake Shore Model 218 Temperature Monitor User’s Manual 5.1.4 Entering a New Curve To begin entering a user curve, press Curve Entry. The first screen appears. Use the Data Selection keys to select Edit Curve, then press Enter. The second display in the setting sequence appears.

  • Page 50: Erasing User Curves

    Lake Shore Model 218 Temperature Monitor User’s Manual 5.1.5 Erasing User Curves To erase a user curve, press Curve Entry. The screen below appears. Use the Data Selection keys to select Erase Curve, then press Enter. The second display in the sequence appears.

  • Page 51: Softcal

    Calibration can be no better than user-supplied data. • Purchased: Lake Shore sensors with SoftCal™ calibration include a set of calibration points in the calibration report. Lake Shore generates these points in a controlled calibration facility for best accuracy.

  • Page 52: Softcal™ And Silicon Diode Sensors

    5.2.1 SoftCal™ and Silicon Diode Sensors Lake Shore Silicon Diode Sensors incorporate remarkably uniform sensing elements that exhibit precise, monotonic, and repeatable temperature response. For example, the Lake Shore DT-470 Series of silicon diode sensors has a repeatable temperature response from 2 K to 475 K. These sensors closely follow a standard curve response and are interchangeable.

  • Page 53: Softcal™ Accuracy With Silicon Diode Sensors

    ±0.01 K for 4.2 K (liquid helium). Users performing the SoftCal™ with silicon diodes and Lake Shore instruments should note that liquefied nitrogen and ice point temperatures can vary as much as ±0.5 K. Use a calibrated standard sensor if possible.

  • Page 54: Softcal™ Accuracy With Platinum Sensors

    SoftCal™ assume ±0.05 K for 77.35 K (liquid nitrogen) and 305 K (room temperature) points. Users performing a SoftCal™ with Lake Shore instrumentation should note that liquefied nitrogen and ice point temperatures can vary as much as ±0.5 K. Use a calibrated standard sensor if possible.

  • Page 55: Data Logging

    Lake Shore Model 218 Temperature Monitor User’s Manual SoftCal™ Calibration Curve Creation (Continued) The sixth display in the setting sequence appears. Use the number keys to input the voltage or resistance of the third calibration data point, then press Enter. Use the number keys to input the temperature in Kelvin that corresponds to the voltage or resistance of the third calibration data point, then press Enter.
  • Page 56 Lake Shore Model 218 Temperature Monitor User’s Manual Log Setup (Continued) Data logging continues beyond the maximum number of records specified and overwrites old records with new. Data logging stops at the maximum number of records specified. The third display in the setting sequence appears.

  • Page 57: Starting And Stopping Data Log

    Lake Shore Model 218 Temperature Monitor User’s Manual 5.3.2 Starting and Stopping Data Log The Log On/Off key is used to start and stop data logging. The start and overwrite parameters set with Log Setup determine the operation of Log On/Off key.

  • Page 58: Printing

    Lake Shore Model 218 Temperature Monitor User’s Manual PRINTING The Model 218 can send sensor input data to a printer for a hard copy temperature record. The instrument’s serial port interfaces with standard printers. The serial computer interface and a printer cannot be used at the same time.

  • Page 59: Printer Connector And Cable

    Lake Shore Model 218 Temperature Monitor User’s Manual 5.4.2 Printer Connector & Cable For most serial printers, a standard PC to printer cable may be used. F-218-5-3.bmp Description No Connection (NC) Receive Data (RD in) Transmit Data (TD out) Data Terminal Ready (DTR out)
  • Page 60 Lake Shore Model 218 Temperature Monitor User’s Manual Printer Operation (Continued) Print Continuous Directs log records to the printer instead of internal memory. Setup the data log feature as described in paragraph 5.3.1. The log period must be greater than 10 seconds when printing.

  • Page 61: Remote Operation

    REMOTE OPERATION GENERAL This chapter provides operational instructions for the computer interface for the Lake Shore Model 218 Temperature Monitor. Either of the two computer interfaces provided with the Model 218 permit remote operation. The first is the IEEE-488 Interface described in Paragraph 6.1. The second is the Serial Interface described in Paragraph 6.2.

  • Page 62: Ieee-488 Interface Settings

    Lake Shore Model 218 Temperature Monitor User’s Manual 6.1.1 IEEE-488 Interface Settings If using the IEEE-488 interface, you must set the IEEE Address and Terminators. Press the Interface key. The first screen selects Serial Interface Baud Rate, and therefore is skipped by pressing the Enter key.

  • Page 63: Status Registers

    Lake Shore Model 218 Temperature Monitor User’s Manual Bus Control Commands (Continued) Finally, Addressed Bus Control Commands are Multiline commands that must include the Model 218 listen address before the instrument responds. Only the addressed device responds to these commands. The Model 218 recognizes three of the Addressed Bus Control Commands: SDC (Selective Device Clear) –...
  • Page 64 Lake Shore Model 218 Temperature Monitor User’s Manual Status Byte Register and Service Request Enable Register (Continued) Service Request (SRQ) Bit (6) – Determines whether the Model 218 is to report via the SRQ line and six bits determine which status reports to make. If bits 0, 2, 3, 4, 5, or 7 are set, then the corresponding bit in the Status Byte Register is set.

  • Page 65: Example Ieee Setup And Program

    Lake Shore Model 218 Temperature Monitor User’s Manual Standard Event Status Register and Standard Event Status Enable Register (Continued) Query Error (QYE) Bit (2) – The QYE bit indicates a query error. It occurs rarely and involves loss of data because the output queue is full.
  • Page 66 Lake Shore Model 218 Temperature Monitor User’s Manual Table 6-1. Sample BASIC IEEE-488 Interface Program IEEEEXAM.BAS EXAMPLE PROGRAM FOR IEEE-488 INTERFACE This program works with QuickBasic 4.0/4.5 on an IBM PC or compatible. The example requires a properly configured National Instruments GPIB-PC2 card. The REM $INCLUDE statement is necessary along with a correct path to the file QBDECL.BAS.

  • Page 67: Typical National Instruments Gpib Configuration From Ibconf.exe

    Lake Shore Model 218 Temperature Monitor User’s Manual C-460-6-1.bmp Figure 6-1. Typical National Instruments GPIB Configuration from IBCONF.EXE Remote Operation...

  • Page 68: Serial Interface

    Lake Shore Model 218 Temperature Monitor User’s Manual SERIAL INTERFACE OVERVIEW The serial interface used in the Model 218 is commonly referred to as an RS-232C interface. RS-232C is a standard of the Electronics Industries Association (EIA) that describes one of the most common interfaces between computers and electronic equipment.

  • Page 69: Character Format

    Lake Shore Model 218 Temperature Monitor User’s Manual 6.2.3 Character Format A character is the smallest piece of information that can be transmitted by the interface. Each character is 10 bits long and contains data bits, bits for character timing and an error detection bit.

  • Page 70: Message Flow Control

    Lake Shore Model 218 Temperature Monitor User’s Manual 6.2.5 Message Flow Control It is important to remember that the user program is in charge of the serial communication at all times. The instrument can not initiate communication, determine which device should be transmitting at a given time or guarantee timing between messages.

  • Page 71: Serial Interface Basic Programs

    Lake Shore Model 218 Temperature Monitor User’s Manual 6.2.7 Serial Interface Basic Programs Two BASIC programs are included to illustrate the serial communication functions of the instrument. The first program was written in Visual Basic. Refer to Paragraph 6.2.7.1 for instructions on how to setup the program.
  • Page 72 Lake Shore Model 218 Temperature Monitor User’s Manual Table 6-3. Serial Interface Program Control Properties Current Name Property New Value Label1 Name lblExitProgram Caption Type “exit” to end program. Label2 Name lblCommand Caption Command Label3 Name lblResponse Caption Response Text1...
  • Page 73 Lake Shore Model 218 Temperature Monitor User’s Manual Table 6-4. Visual Basic Serial Interface Program Public gSend As Boolean 'Global used for Send button state Private Sub cmdSend_Click() 'Routine to handle Send button press gSend = True 'Set Flag to True...
  • Page 74 Lake Shore Model 218 Temperature Monitor User’s Manual 6.2.7.2 Quick Basic Serial Interface Program Setup The serial interface program (Table 6-5) works with QuickBasic 4.0/4.5 or Qbasic on an IBM PC (or compatible) running DOS or in a DOS window with a serial interface. It uses the COM1 communication port at 9600 Baud.
  • Page 75 Lake Shore Model 218 Temperature Monitor User’s Manual 6.2.7.3 Program Operation Once either program is running, try the following commands and observe the response of the instrument. Input from the user is shown in bold and terminators are added by the program. The word [term] indicates the required terminators included with the response.

  • Page 76: Troubleshooting

    Lake Shore Model 218 Temperature Monitor User’s Manual 6.2.8 Trouble Shooting New Installation 1. Check instrument baud rate 2. Make sure transmit (TD) signal line from the instrument is routed to receive (RD) on the computer and vice versa. (Use a null modem adapter if not).
  • Page 77 Lake Shore Model 218 Temperature Monitor User’s Manual Table 6-5. Model 218 Interface Commands by Function Command Function Page Command Function Page Clear Interface ........18 FILTER? Query Filter .......... 24 QCLS Set Std. Event Status Enable ....18 IEEE Set IEEE Interface ........
  • Page 78 Lake Shore Model 218 Temperature Monitor User’s Manual IEEE-488/SERIAL INTERFACE COMMANDS (ALPHABETICAL LISTING) QCLS Clear Interface Command Input: QCLS Returned: Nothing Remarks: Clears bits in the Status Byte Register and Standard Event Status Register and terminates all pending operations. Clears the interface, but not the instrument. See QRST command.
  • Page 79 Lake Shore Model 218 Temperature Monitor User’s Manual QOPC? Query Operation Complete Input: QOPC? Returned: 1. Format: n[term] Remarks: Places a “1” in the controller output queue upon completion of all pending selected device operations. Send this as the last command in a command string. This is not the same function as the QOPC command.
  • Page 80 Lake Shore Model 218 Temperature Monitor User’s Manual ALARM Configure Input Alarm Parameters Input: ALARM <input>,<off/on>,<source>,<high value>,<low value>,<deadband>,<latch enable> Returned: Nothing. Remarks: Configures the alarm parameters for an input. <input> Specifies which input to configure (1-8). <off/on> Determines whether the instrument checks the alarm for this input.
  • Page 81 Lake Shore Model 218 Temperature Monitor User’s Manual ANALOG Configure Analog Output Parameters Input: ANALOG <output>,<bipolar enable>,<mode>,<input>,<source>,<high value>,<low value>, <manual value> Returned: Nothing. Remarks: <output> Specifies which analog output to configure (1 or 2). <bipolar enable> Specifies analog output: 0 = positive only, or 1 = bipolar.
  • Page 82 Lake Shore Model 218 Temperature Monitor User’s Manual CRDG? Query Celsius Reading for a single Input or All Inputs Input: CRDG? <input> Returned: <Celsius value>. Format: +/-nn.nnn[term]. Or if all inputs are queried: <Input 1 Celsius Value>,<Input 2 Celsius Value>,<Input 3 Celsius Value>,<Input 4 Celsius Value>,<Input 5 Celsius Value>,<Input 6 Celsius Value>,<Input 7 Celsius...
  • Page 83 Lake Shore Model 218 Temperature Monitor User’s Manual CRVPT? Query Curve Data Point Input: CRVPT? <curve>, <index> Returned: <units value>, <temp value>. Format: +nnn.nnn,+nnn.nnn[term] Remarks: Returns a standard or user curve data point. See CRVPT command for parameter descriptions. <curve> Specifies which curve to query. 1-5 = Standard Diode Curves, 6-9 = Standard Platinum Curves, 21-28 = User Curves.
  • Page 84 Lake Shore Model 218 Temperature Monitor User’s Manual FILTER Configure Input Filter Parameters Input: FILTER <input>, <off/on >, <points>, <window> Returned: Nothing. Remarks: <input> Specifies input to configure (1-8). <off/on> Specifies whether the filter function is off or on. 0 = Off, 1 = On.
  • Page 85 Lake Shore Model 218 Temperature Monitor User’s Manual INPUT Configure Input Control Parameter Input: INPUT <input>, <off/on> Returned: Nothing. Remarks: Turns selected input on or off. <input> Specifies which input to configure(1-8). <off/on> Disables/Enables input. 0 = Off, 1 = On.
  • Page 86 Lake Shore Model 218 Temperature Monitor User’s Manual LINEAR Configure Input Linear Equation Parameters Input: LINEAR <input>, <varM value>, <X source>, <varB value> Returned: Nothing. Remarks: Configures the linear equation for an input. <input> Specifies input to configure (1-8). <varM value> Specifies a value for m in the equation.
  • Page 87 Lake Shore Model 218 Temperature Monitor User’s Manual LOGREAD Configure Log Records Input: LOGREAD <reading number>, <input>, <source> Returned: Nothing. Remarks: Configures log records. <reading number> The individual reading number (1-8) within a log record to configure. <input> The input number to log (1-8).
  • Page 88 Lake Shore Model 218 Temperature Monitor User’s Manual LRDG? Query Linear Equation Data for a Single Input or All Inputs. Input: LRDG? <input> Returned: <Linear value>. Format: +/-nn.nnn[term] Or if all inputs are queried: <Input 1 Linear Value>,<Input 2 Linear Value>,<Input 3 Linear Value>,<Input 4 Linear Value>,<Input 5 Linear Value>,<Input 6 Linear Value>,<Input 7 Linear Value>,<Input 8...
  • Page 89 Lake Shore Model 218 Temperature Monitor User’s Manual RDGST? Query Input Status Input: RDGST? <input> Returned: <reading bit weighting>. Format: nnn[term]. Remarks: The integer returned represents the sum of the bit weighting of the input status flag bits. <input> specifies which input to query.
  • Page 90 Lake Shore Model 218 Temperature Monitor User’s Manual SCAL Generate SoftCal™ Curve Input: SCAL <std>, <dest>, <SN>, <T1 value>, <U1 value>, <T2 value>, <U2 value>, <T3 value>, <U3 value> Returned: Nothing. Remarks: <std> Specifies the standard curve to generate a SoftCal™ from (1,6,7).

  • Page 91: Service

    This chapter provides general service information for the Model 218 Temperature Monitor. There is no calibration procedure for the Model 218. There are no serviceable parts inside the Model 218. Contact Lake Shore about specific problems with the Model 218. GENERAL MAINTENANCE PRECAUTIONS Below are general safety precautions unrelated to any other procedure in this publication.

  • Page 92: Handling Electrostatic Discharge Sensitive Components

    Lake Shore Model 218 Temperature Monitor User’s Manual 7.2.2 Handling Electrostatic Discharge Sensitive Components Observe all precautions necessary to prevent damage to ESDS components before attempting installation. Bring the device and everything that contacts it to ground potential by providing a conductive surface and discharge paths.

  • Page 93: Fuse Replacement

    Lake Shore Model 218 Temperature Monitor User’s Manual FUSE REPLACEMENT Use the following procedure to remove and replace a line fuse. WARNING: To avoid potentially lethal shocks, turn off controller and disconnect it from AC power before performing these procedures.

  • Page 94: Terminal Block (Model 218S Only)

    Lake Shore Model 218 Temperature Monitor User’s Manual TERMINAL BLOCK (MODEL 218S ONLY) F-218-7-4.eps DESCRIPTION DESCRIPTION Relay 1 NC Relay 5 NC Relay 1 COM Relay 5 COM Relay 1 NO Relay 5 NO Relay 2 NC Relay 6 NC...

  • Page 95: Ieee-488 Interface Connector

    Lake Shore Model 218 Temperature Monitor User’s Manual IEEE-488 INTERFACE CONNECTOR (MODEL 218S ONLY) Connect to the IEEE-488 Interface connector on the Model 218 rear with cables specified in the IEEE-488-1978 standard document. The cable has 24 conductors with an outer shield. The connectors are 24-way Amphenol 57 Series (or equivalent) with piggyback receptacles to allow daisy-chaining in multiple device systems.

  • Page 96: Serial Interface Cable And Adapters

    Lake Shore Model 218 Temperature Monitor User’s Manual SERIAL INTERFACE CABLE AND ADAPTERS 218 to PC Serial Interface – PC with DE-9P 218 DE-9P Standard Null-Modem Cable (DE-9S to DE-9S) PC DE-9P 5 - GND 5 - GND 2 - RD (in)

  • Page 97: Top Of Enclosure Remove And Replace Procedure

    Lake Shore Model 218 Temperature Monitor User’s Manual F-218-7-6.bmp Model 218 Computers and Printers 218 DE-9P DB-25P DE-9P Description Description Description No Connection (NC) TD (out) DCD (in) Receive Data (RD in) RD (in) RD (in) Transmit Data (TD out)

  • Page 98: Eprom And Novram Replacement

    Lake Shore Model 218 Temperature Monitor User’s Manual 7.11 EPROM AND NOVRAM REPLACEMENT The operating software for the Model 218 is contained on one Erasable Programmable Read Only Memory (EPROM) Integrated Circuit (IC). The reference designator for the EPROM is U17. See Figure 7-7.

  • Page 99: Location Of Internal Components

    Lake Shore Model 218 Temperature Monitor User’s Manual F-218-7-7.bmp Figure 7-7. Location of Internal Components Service...

  • Page 100: Calibration Procedure

    Lake Shore Model 218 Temperature Monitor User’s Manual 7.13 CALIBRATION PROCEDURE Both groups of sensor inputs require calibration. Sensor Input groups consist of 4 separate current sources which can supply 10 µA or 1 mA of current. They are calibrated by adjusting pots on the Model 218 main board.

  • Page 101: Zero Calibration

    Lake Shore Model 218 Temperature Monitor User’s Manual 7.13.5 Zero Calibration PURPOSE: To determine the zero offset of the input stage and provide an offset constant back to the Model 218. CONFIG: Same as Paragraph 7.13.4 above except that only the 3 input of the group is enabled.

  • Page 102: Ω Input Gain Calibration

    Lake Shore Model 218 Temperature Monitor User’s Manual PROCESS: Adjust the four current source calibration pots on the Model 218 main board until each of the 4 inputs display exactly 2.0000 V. 7.13.9 250 Ω Input Gain Calibration PURPOSE: To determine the input gain errors when the input is configured for 250 Ω input and provide gain calibration constants back to the Model 218.

  • Page 103: Kω Input Gain Calibration

    7.13.14 Analog Output Calibration and Test (Model 218s Only) The Model 218S has two analog outputs which require calibration. Zero offset and gain are adjusted for each input via pots on the Model 218 main board. NOTE: Analog output calibration must be performed on both analog outputs.

  • Page 104: Calibration Specific Interface Commands

    Lake Shore Model 218 Temperature Monitor User’s Manual 7.13.15 CALIBRATION SPECIFIC INTERFACE COMMANDS ADCAL Calibrates A/D Linearity Input: ADCAL <input group> Returned: Nothing Remarks: Calibrates the A/D linearity of the selected input group. Before issuing command the input group must be configured as follows: A precision 2.5 V attached to input 1, a precision –2.5 V attached to input 2, and a precision ground at input 3.
  • Page 105 Lake Shore Model 218 Temperature Monitor User’s Manual GCAL? Returns the Gain Calibration Constant for the Selected Input Input: GCAL? <input>, <type> Returned: Value of gain calibration constant for the selected input. Remarks: See GCAL command for description of returned data.
  • Page 106 Lake Shore Model 218 Temperature Monitor User’s Manual This Page Intentionally Left Blank 7-16 Service...

  • Page 107: Accessories

    Two 25-pin D-sub plugs used for sensor input connector G-106-264* Two 25-pin D-sub shells used for sensor input connector 106-772* Two 14-pin connectors used for relays and analog outputs (218S only) 115-006* Detachable 120 VAC line cord 1 m IEEE-488 (GPIB) computer interface cable assembly–includes extender which allows...
  • Page 108 Lake Shore Cryogenic Wire. Lake Shore sells the following types of cryogenic wire: DT = Duo-Twist™, MN = Single Strand, MW = Manganin, NC = Nichrome Heater, ND = Heavy Duty, QL = Quad-Lead™, and QT = Quad-Twist™. Refer to the Lake Shore Temperature Measurement and Control Catalog for details.

  • Page 109: Model Rm-1/2 Rack-Mount Kit

    Lake Shore Model 218 Temperature Monitor User’s Manual C-218-8-1.bmp Figure 8-1. Model RM-1/2 Rack-Mount Kit Accessories...
  • Page 110 Lake Shore Model 218 Temperature Monitor User’s Manual C-218-8-2.bmp Figure 8-2. Model RM-2 Dual Rack-Mount Shelf Accessories...

  • Page 111: Appendix A - Curve Tables

    Lake Shore Model 218 Temperature Monitor User’s Manual APPENDIX A CURVE TABLES A1.0 GENERAL The following are curve tables applicable to the Model 218 Temperature Monitor. Table A-1. Standard DT-470 Diode Curve Breakpoint Temp. (K) Breakpoint Temp. (K) Breakpoint Temp. (K) 0.09062...
  • Page 112 Lake Shore Model 218 Temperature Monitor User’s Manual Table A-2. Other Standard Diode and Platinum Curves DT-500-D DIODE CTI DIODE PLATINUM 100 OHM PLATINUM 1000 OHM Breakpoint Number Temp. (K) Temp. (K) Ohms Temp. (K) Ohms Temp. (K) 0.19083 365.0 0.29680...

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