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Lake Shore 218, User Manual

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Lake Shore 218 User Manual Download Page 1

 

 

 

Revision 2.2 

P/N 119-007 

03 July 2012

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 

Includes Coverage For: 

Model 218S and Model 218E 

 

 

 

Lake Shore Cryotronics, Inc. 
575 McCorkle Blvd. 
Westerville, Ohio 43082-8888 USA 

 

Internet Addresses: 

[email protected] 
[email protected] 

 

Visit Our Website: 

www.lakeshore.com 

 

Fax: (614) 891-1392 
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. 

User’s Manual

 

Model 218

 

Temperature Monitor 

Summary of Contents for 218

Page 1: ...nment 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 a...

Page 2: ...ANTY STATEMENT Continued 9 EXCEPT TO THE EXTENT ALLOWED BY APPLICABLE LAW THE TERMS OF THIS LIMITED WARRANTY STATEMENT DO NOT EXCLUDE RESTRICT OR MODIFY AND ARE IN ADDITION TO THE MANDATORY STATUTORY RIGHTS APPLICABLE TO THE SALE OF THE PRODUCT TO YOU CERTIFICATION Lake Shore certifies that this product has been inspected and tested in accordance with its published specifications and that this pro...

Page 3: ... 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 EN 61010 1 2001 Overvoltage II Pollution Degree 2 EN 61326 A2 2001 Class A Annex B Model Number 218 Ed Maloof Printed Name Vice President of Engineering Position ...

Page 4: ...user may be required to take adequate measures The instrument was tested under normal operating conditions with sensor and interface cables attached If the installation and operating instructions in the User s Manual are followed there should be no degradation in EMC performance Pay special attention to instrument cabling Improperly installed cabling may defeat even the best EMC protection For the...

Page 5: ... 2 2 2 2 SoftCal 2 2 2 2 3 Standard Curves 2 3 2 2 4 CalCurve 2 4 2 3 SENSOR INSTALLATION 2 4 2 3 1 Mounting Materials 2 4 2 3 2 Sensor Location 2 4 2 3 3 Thermal Conductivity 2 4 2 3 4 Contact Area 2 5 2 3 5 Contact Pressure 2 5 2 3 6 Lead Wire 2 6 2 3 7 Lead Soldering 2 6 2 3 8 Heat Sinking Leads 2 6 2 3 9 Thermal Radiation 2 6 2 3 10 Thermal EMF Compensation with Voltage Excitation 2 6 3 INSTAL...

Page 6: ...Existing Curve 5 2 5 1 4 Entering A New Curve 5 3 5 1 5 Erasing User Curves 5 4 5 1 6 Viewing Standard Curves 5 4 5 1 7 Copying Curves 5 4 5 2 SOFTCAL 5 5 5 2 1 SoftCal and Silicon Diode Sensors 5 6 5 2 2 SoftCal Accuracy with Silicon Diode Sensors 5 7 5 2 3 SoftCal and Platinum Sensors 5 7 5 2 4 SoftCal Accuracy with Platinum Sensors 5 8 5 2 5 Creating a SoftCal Calibration Curve 5 8 5 3 DATA LOG...

Page 7: ...TERMINAL BLOCK MODEL 218S ONLY 7 4 7 8 IEEE 488 INTERFACE CONNECTOR 7 5 7 9 SERIAL INTERFACE CABLE AND ADAPTERS 7 6 7 10 TOP OF ENCLOSURE REMOVE AND REPLACE PROCEDURE 7 7 7 11 EPROM AND NOVRAM REPLACEMENT 7 8 7 12 ERROR MESSAGES 7 8 7 13 CALIBRATION PROCEDURE 7 10 7 13 1 Required Equipment List 7 10 7 13 2 Sensor Input Calibration Setup 7 10 7 13 3 Clear Calibration 7 10 7 13 4 A D Linearity Calib...

Page 8: ...tors 7 4 7 5 IEEE 488 Rear Panel Connector Details 7 5 7 6 Serial Port Pinouts 7 7 7 7 Location of Internal Components 7 9 8 1 Model RM 1 2 Rack Mount Kit 8 3 8 2 Model RM 2 Dual Rack Mount Kit 8 4 LIST OF TABLES Table No Title Page 1 1 Supported Lake Shore Sensors 1 1 1 2 Model 218 Sensor Input Performance Chart 1 4 3 1 AC Line Input Definitions 3 3 4 1 Sensor Input Type Display Messages 4 6 4 2 ...

Page 9: ...es The Model 218S has many interface features intended for system integration and automated data collection that make it useful for cryogenic and noncryogenic applications The Model 218S includes two computer interfaces IEEE 488 and serial Data logging memory and printer capability are included to help automate data collection Two analog voltage outputs an alarm feature and eight relays enhance sy...

Page 10: ...0 K Rhodium Iron RF 100T U 1 4 K to 325 K Negative Temperature Coefficient RTDs2 Cernox CX 1010 2 K to 325 K4 Cernox CX 1030 HT 3 5 K to 420 K3 6 Cernox CX 1050 HT 4 K to 420 K3 6 Cernox CX 1070 HT 15 K to 420 K3 Cernox CX 1080 HT 50 K to 420 K3 Germanium GR 200A B 1000 2 2 K to 100 K4 Germanium GR 200A B 1500 2 6 K to 100 K4 Germanium GR 200A B 2500 3 1 K to 100 K4 Carbon Glass CGR 1 500 4 K to 3...

Page 11: ...red from the front panel or via computer interface and are grouped in two sets of four Each set of four inputs are configured for the same sensor type i e all 100 Ω Platinum or all Silicon Diodes etc Sensor Input Reading Capability The Model 218 has two high resolution A D converters to increase its update rate It can read sensor inputs more quickly than other scanning monitors because it does not...

Page 12: ...rane numeric and specific functions Front Panel Features Front panel curve entry and keypad lock out Interface IEEE 488 2 Interface 218S Only SH1 AH1 T5 L4 SR1 RL1 PP0 DC1 DT0 C0 E1 Serial Interface RS 232C Electrical DE 9 Connector 9600 BAUD Printer Capability Support for serial printer through serial interface Used with Data Log parameters Alarms Number 16 High and low for each input Data Source...

Page 13: ...K at 77 K 10 mK at 300 K 10 mK at 475 K 20 uV 1 mK at 10 K 16 mK at 77 K 10 mK at 300 K 10 mK at 475 K 2 mΩ 10 6 mK at 30 K 10 mK at 77 K 10 mK at 300 K 10 mK at 675 K 10 mK at 800 K 20 mΩ 10 6 mK at 30 K 10 mK at 77 K 10 mK at 300 K 10 mK at 800 K 50 mΩ 1 mK at 4 2 K 33 3 mK at 77 K 500 mK at 300 K Electronic Accuracy Sensor Units Temperature Equivalence 160 uV 0 01 RDG 11 mK at 4 2 K 138 mK at 7...

Page 14: ......

Page 15: ...they are dangerous because they replace air in a normal breathing atmosphere Liquid helium is an even greater threat because a small amount of liquid evaporates to create a large amount of gas Store and operate cryogenic dewars in open well ventilated areas When transferring LHe and LN2 protect eyes and skin from accidental contact with liquid or the cold gas issuing from it Protect eyes with full...

Page 16: ...g the power cable into an approved three contact electrical outlet or use a three contact adapter with the grounding wire green firmly connected to an electrical ground safety ground at the power outlet The power jack and mating plug of the power cable meet Underwriters Laboratories UL and International Electrotechnical Commission IEC safety standards Ventilation The instrument has ventilation hol...

Page 17: ... 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 2 1 2 Sensor Sensitivity Temperature sensor sensitivity measures how much a sensor signal changes when the temperat...

Page 18: ...andards are traceable to the U S National Institute of Standards and Testing NIST or the National Physical Laboratory in Great Britain These standards allow Lake Shore to calibrate sensors from 50 mK to above room temperature Calibrated sensors are more expensive than uncalibrated sensors Calibrated temperature sensors are the most accurate available from Lake Shore Errors from sensor calibration ...

Page 19: ...response curve can be created for them Standard curves are a convenient and inexpensive way to get reasonable temperature accuracy Sensors with a standard curve are often used when interchangeability is important Some individual sensors are selected for their ability to match a published standard curve and sold at a premium but in general these sensors do not provide the accuracy of a calibrated s...

Page 20: ... ordered with sensors or instruments 2 3 1 Mounting Materials The high vacuum used to insulate cryostats is one consideration in choosing sensor mounting materials Choose materials with a low vapor pressure so they do not evaporate or out gas and spoil the vacuum insulation Metals and ceramics do not have this problem but greases and varnishes must be checked Another consideration is temperature e...

Page 21: ...oil and cryogenic grease are examples 2 3 5 Contact Pressure When sensors are permanently mounted the solder or epoxy used to hold the sensor acts as both gasket and adhesive Permanent mounting is not a good solution for everyone because it limits flexibility and can potentially damage sensors Much care should be taken not to over heat or mechanically stress sensor packages Less permanent mounting...

Page 22: ...ate heat to cold surfaces even through a vacuum The difference in temperature between the surfaces is one thing that determines how much heat is transferred Thermal radiation causes thermal gradients and reduces measurement accuracy Many cooling systems include a radiation shield The purpose of the shield is to surround the load sample and sensor with a surface that is at or near their temperature...

Page 23: ...otify Lake Shore immediately of any missing parts Lake Shore cannot be responsible for any missing parts unless notified within 60 days of shipment Refer to the standard Lake Shore Warranty on the A Page behind the title page 3 2 REPACKAGING FOR SHIPMENT To return the Model 218 sensor or accessories for repair or replacement obtain a Return Goods Authorization RGA number from Technical Service in ...

Page 24: ...king sensor to instrument connections F 218 3 1 eps 1 Line Input Assembly Paragraph 3 3 1 2 Serial I O and Printer Connector Paragraph 6 2 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 Model ...

Page 25: ...use Fuse values should be verified any time line voltage configuration is changed Instructions for changing and verifying a line fuse are given in Paragraph 7 5 3 3 1 3 Power Cord The Model 218 includes a 3 conductor power cord that mates with the IEC 320 C14 line cord receptacle Line voltage is present on the two outside conductors and the center conductor is a safety ground The safety ground att...

Page 26: ... to Paragraph 4 5 to configure inputs for a sensor type with software Disable unused sensor inputs with the Input Type key Paragraph 4 5 It is possible for an overload condition on one sensor to affect the reading on another in the same connector Wire redundant sensors in separate connectors for best reliability Split fewer than eight sensors evenly between connectors for best reading efficiency F...

Page 27: ...ial so the Model 218 offers a shield that stays close to the measurement Connect the sensor cable shield to the input connector shield pin Do not terminate the shield at the opposite end Do not connect the shield to earth ground on the instrument chassis or in the cooling system Please note the shell of the connector is in contact with the chassis so the cable shield should never touch the outer s...

Page 28: ...When measuring voltage for diode sensors the error in voltage can be calculated as the lead resistance times the current typically 10 uA For example a 10 Ω lead resistance times 10 µA results in a 0 1 mV error in voltage Given the sensitivity of a silicon diode at 4 2 K the error in temperature would be only 3 mK At 77 K the sensitivity of a silicon diode is lower so the error would be close to 50...

Page 29: ...wire with the terminals Smaller wire is suitable for most applications See Figure 3 4 F 218 3 4 eps PIN DESCRIPTION PIN DESCRIPTION 1 Relay 1 NC 15 Relay 5 NC 2 Relay 1 COM 16 Relay 5 COM 3 Relay 1 NO 17 Relay 5 NO 4 Relay 2 NC 18 Relay 6 NC 5 Relay 2 COM 19 Relay 6 COM 6 Relay 2 NO 20 Relay 6 NO 7 Relay 3 NC 21 Relay 7 NC 8 Relay 3 COM 22 Relay 7 COM 9 Relay 3 NO 23 Relay 7 NO 10 Relay 4 NC 24 Re...

Page 30: ...on of the analog output is 1 25 mV or 0 0125 of full scale They can drive a resistive load of no less than 1 kΩ The output is short protected so the instrument is not harmed if resistance is too small It is not recommended because the additional load on instrument power supplies causes noise on internal circuits It is not recommended to attach the analog output ground to a ground outside the instr...

Page 31: ...SCREEN DESCRIPTION The Model 218 has a 4 line by 20 character backlit LCD During normal operation it is divided into eight reading locations Each of the eight reading locations can be configured by the user with the Display Format feature Data from a sensor input can be displayed in any location Sensor readings can be displayed in temperature or sensor units Results of the math feature can be disp...

Page 32: ...n Result of linear equation output System Annunciators R Remote IEEE 488 operation A Alarm Enabled D Data Log Enabled Other Displays blank Display location off DISABLED Input for this location disabled ALM HIGH High alarm triggered for input at this location ALM LOW Low alarm triggered for input at this location NO CURVE No curve selected for input at this location T OVER Temperature over curve ca...

Page 33: ...log voltage outputs 218S Refer to Paragraph 4 8 SoftCal Initiates SoftCal feature Refer to Paragraph 5 2 Log Setup Sets up data log feature Refer to Paragraph 5 3 1 Log View Views logged data Refer to Paragraph 5 3 3 Log On Off Turns data logging on or off Refer to Paragraph 5 3 2 Local Returns instrument to local operation after remote IEEE 488 operation 218S Refer to Chapter 6 Interface Sets up ...

Page 34: ... cord included with the connector kit into the power and fuse assembly receptacle on the instrument rear Plug the opposite end of the line cord into a properly grounded three prong receptacle Flip power switch located next to the line cord receptacle to the On I position The instrument initiates the following power up sequence the instrument alarm sounds once the display shows a startup message th...

Page 35: ...in the selected location Press Escape at any time to return to the normal display The instrument retains values changed prior to pressing Escape Repeat the sequence for other display locations 4 5 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 ...

Page 36: ...for maximum reading rate Press Escape at any time to return to the normal display The instrument retains values changed prior to pressing Escape After setting all Input Type parameters the normal display appears The message Disabled appears in the display location of any inputs that are turned off Table 4 1 Sensor Input Type Display Messages Display Message Sensor Type 2 5V Diode Silicon Diode 7 5...

Page 37: ...lected before curves Standard curves are included in the instrument and can be assigned to sensor inputs that match them Standard curves included in the Model 218 are listed in Table 4 3 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 fro...

Page 38: ...es are included for convenience and aid in setting up experiments Readings can be filtered to quiet effects of a noisy environment Max and Min readings can be captured A linear equation can be applied to input data to correct system errors or improve performance of the analog outputs Math features can be performed on all eight sensor inputs Each input must be configured seperately 4 7 1 Max Min Th...

Page 39: ...ent retains values changed prior to pressing Escape 4 7 1 1 Resetting Max Min To manually reset Max Min press Math The display to the right appears Press Math again to reset Max Min Max Min automatically resets when the instrument is turned off or parameters related to the input change 4 7 2 Linear The Model 218 will process a simple linear equation MX B for each sensor input M slope of a line X r...

Page 40: ...gs are available as often as non filtered readings The number of filter points determines how much smoothing is done One filter point corresponds to one new reading on that input A larger number of points does more smoothing but also slows the instruments response to real changes in temperature If the measured temperature changes quickly the reading will settle at the new value in about 6 times th...

Page 41: ...be used to drive a resistance lower than 1 kΩ Analog output terminals are in the detachable terminal block on the Model 218S rear panel The analog outputs each have three modes of operation off input and manual Once a mode is selected the parameters associated with that mode follow on setting screens The two outputs are configured independently and can have different modes To set the operating mod...

Page 42: ...n the desired unit appears The third display in the Input mode setting sequence appears Use the Data Selection keys to turn Bipolar Mode On or Off then press Enter Bipolar allows the analog output to set a negative voltage On Allows a range from 10V to 10V Off Allows a range from 0 V to 10V The fourth display in the Input mode setting sequence appears Use the number keys to input a value correspon...

Page 43: ...ms activate The eight relays on a 218S can also be tied to alarm functions as described in Paragraph 4 11 The system Alarm annunciator steadily displays when any alarm is enabled it flashes when any alarm activates An input need not display for the system Alarm annunciator to indicate input alarm status Latching Alarms Often used to detect faults in a system or experiment that require operator int...

Page 44: ...ve digits The sixth display in the setting sequence appears Use the number keys to input a dead band value with the specified source then press Enter Used only with non latching alarm Set to 0 if not used Resolution is five digits The seventh display in the setting sequence appears Use the Data Selection keys to turn alarm latching On or Off then press Enter Latching determines whether the alarm r...

Page 45: ... on the Model 218S rear panel To begin relay setup press Relay Setup The first display appears Use the Data Selection keys to cycle through the relays 1 8 Press Enter when the desired relay appears The second display in the setting sequence appears Use the Data Selection keys to cycle through the relay modes There are three relay modes Off Relay manually set to the normal state On Relay manually s...

Page 46: ...k the keypad press and hold Enter for 10 seconds to display the screen to the right Use the number keys to enter the 3 digit lock code The keypad unlocks and the normal display appears All Model 218 parameters are now accessible 4 13 RESETTING MODEL 218 TO DEFAULTS To reset the Model 218 to defaults press and hold Escape until the screen to the right appears Use the Data Selection keys to select Y...

Page 47: ...g a user curve over the computer interface a curve name of up to 15 characters can be entered Serial Number Up to a 10 character sensor serial number Both numbers and letters can be entered over computer interface only numbers can be entered from the front panel Format The format parameter tells the instrument what breakpoint data format to expect Different sensor types require different formats F...

Page 48: ... units increasing with breakpoint number Leave all unused breakpoints at zero Leave no zero breakpoints in the middle of a user curve they are interpreted as the end of the curve 5 1 3 Editing an Existing Curve Curve editing functions work for existing user curves as well as new curves Enter the curve entry mode as described for a new curve add or erase points as needed then press Enter on the zer...

Page 49: ...Resistance vs Kelvin for NTC resistive sensors When the desired format appears press Enter Refer to Table 5 1 for recommended formats for specific sensors The fifth display in the setting sequence appears Use the number keys to input an appropriate upper temperature limit for the installed sensor then press Enter Refer to Table 5 1 for recommended temperature limits for specific sensors The final ...

Page 50: ...ndard curves using the curve entry procedure Standard curves are read only uneditable 5 1 7 Copying Curves Temperature curves can be copied from one location inside the Model 218 to another This is a good way to make small changes to an existing curve Curve copy may also be necessary if the user needs the same curve with two different temperature limits or needs to extend the range of a standard c...

Page 51: ...nput the Model 218 does not automatically choose the newly generated curve for any input Each algorithm operates with one two or three calibration points The range of improved accuracy increases with more points The calibration points are normally measured at easily reached temperatures like the boiling point of cryogens There are two ways to get SoftCal calibration data points The user records th...

Page 52: ...con Diode Sensors A unique characteristic of DT 400 Series diodes is that their temperature responses pass through 28 K at almost exactly the same voltage This knowledge improves SoftCal operation by providing an extra calibration data point It also explains why SoftCal calibration specifications are divided into two temperature ranges above and below 28 K See Figure 5 1 Point 1 Calibration data p...

Page 53: ... 0 K from 375 to 475 K Three point SoftCal calibrations are performed at liquid helium 4 2 K liquid nitrogen 77 35 K and room temperature 305 K Resultant accuracy for the DT 470 SD 13 diode sensor is 0 5 K from 2 K to 30 0 25 K from 30 K to 60 K 0 15 K from 60 K to 345 K 0 25 K from 345 K to 375 K 1 0 K from 375 to 475 K 5 2 3 SoftCal and Platinum Sensors The platinum sensor is a well accepted tem...

Page 54: ...he right appears Use the Data Selection keys to cycle through the curves to use as a basis for calibration Press Enter when the desired curve appears The second display in the setting sequence appears Use the Data Selection keys to cycle through the inputs where the new SoftCal curve stores Press Enter when the desired input appears CAUTION If a user curve already exists at the input location the ...

Page 55: ... any source Each record includes a time stamp The Model 218 dedicates 12 Kbytes of memory to data logging Table 5 2 indicates the maximum number of records that can be stored based on the number of readings in a record Table 5 2 Storage Capability Based on Readings per Record Records Readings 1500 1 1000 2 750 3 600 4 500 5 425 6 375 7 340 8 5 3 1 Log Setup NOTE Changing Log Setup will erase store...

Page 56: ...n the setting sequence appears Use the Data Selection keys to select the number of readings per record 1 8 The sixth display in the setting sequence appears Use the Data Selection keys to specify the input from which to take readings 1 8 When the desired input appears press Enter The next display in the setting sequence appears Use the Data Selection keys to select the appropriate source for the s...

Page 57: ...s set to yes new records will continue to overwrite old ones until the sequence is stopped With logging active the Data Log D annunciator displays If overwrite is set to No the D annunciator will turn off when the end of the data buffer is reached 5 3 3 Viewing Logged Data To view logged records first turn off logging with the Log On Off key then press Log View If logging is active when Log View i...

Page 58: ...Levels Transmits and receives using EIA voltage levels 5 4 1 Printer Support Serial printers connected directly to the Model 218 must have a serial interface port and should be Epson or HP compatible and support ASCII text mode Continuous feed printers are recommended for all print modes Single sheet feed printers are recommended for printing stored logs only A minimum print speed of 15 characters...

Page 59: ...rdware flow control Printer DB 25S P 3 TD out 3 RD in 2 RD in 2 TD out 8 NC 20 DTR 6 DSR in 1 NC 5 GND 7 GND Figure 5 3 Serial Port Pinouts 5 4 3 Printer Operation To print with the Model 218 first connect the serial port to a serial printer then press Printer The screen shown below displays The Model 218 printer function has three operating modes Printer function can also be turned off freeing th...

Page 60: ...y 10 seconds and prints if one exists If an event occurs and then is removed within the 10 second window it will not print Use the Data Selection keys to cycle through the different modes When the desired mode appears press Enter to activate that mode Select Print Stored Log to print data immediately The screen below displays To stop printing at any time and return to the normal display press Esca...

Page 61: ...specifications unless otherwise specified in this manual All instruments on the interface bus perform one or more of the interface functions of TALKER LISTENER or BUS CONTROLLER A TALKER transmits data onto the bus to other devices A LISTENER receives data from other devices through the bus The BUS CONTROLLER designates to the devices on the bus which function to perform The Model 218 performs the...

Page 62: ...ed into three groups 1 Bus Control refer to Paragraph 6 1 2 1 a Universal 1 Uniline 2 Multiline b Addressed Bus Control 2 Common refer to Paragraph 6 1 2 2 3 Interface and Device Specific refer to Paragraph 6 1 2 3 6 1 2 1 Bus Control Commands A Universal Command addresses all devices on the bus Universal Commands include Uniline and Multiline Commands A Uniline Command Message asserts only a sing...

Page 63: ...6 5 6 1 2 3 Interface and Device Specific Commands Device specific commands are addressed commands The Model 218 supports a variety of device specific commands to program instruments remotely from a digital computer and to transfer measurements to the computer Most device specific commands perform functions also performed from the front panel Model 218 device specific commands are detailed in Para...

Page 64: ...ent Status Enable Register The Standard Event Status Register supplies various conditions of the Model 218 STANDARD EVENT STATUS REGISTER FORMAT Bit 7 6 5 4 3 2 1 0 Weighting 128 64 32 16 8 4 2 1 Bit Name PON Not Used CME EXE DDE QYE Not Used OPC Bits 2 and 6 are not used The user will only be interrupted with the reports of this register if the bits have been enabled in the Standard Event Status ...

Page 65: ...e board and power up the instrument Verify address is 12 and terminators are CR LF 6 1 4 2 Running the Example QuickBasic Program 1 Copy c gpib pc Qbasic qbib obj to the QuickBasic directory QB4 2 Change to the QuickBasic directory and type link q qbib obj bqlb4x lib where x 0 for QB4 0 and 5 for QB4 5 This one time only command produces the library file qbib qlb The procedure is found in the Nati...

Page 66: ...t The computer transmits to the instrument and displays any response If no query is sent the instrument responds to the last query received Type EXIT to exit the program REM INCLUDE c gpib pc qbasic qbdecl bas Link to IEEE calls CLS Clear screen PRINT IEEE 488 COMMUNICATION PROGRAM PRINT CALL IBFIND dev12 DEV12 Open communication at address 12 TERM CHR 13 CHR 10 Terminators are CR LF LOOP2 IN SPAC...

Page 67: ...Lake Shore Model 218 Temperature Monitor User s Manual Remote Operation 6 7 C 460 6 1 bmp Figure 6 1 Typical National Instruments GPIB Configuration from IBCONF EXE ...

Page 68: ...DTE connector holds the transmit line and pin 3 of the DCE connector holds the receive line so the functions complement It is likely both pieces of equipment are wired in the DTE configuration In this case pin 3 on one DTE connector used for transmit must be wired to pin 2 on the other used for receive Cables that swap the complementing lines are called null modem cables and must be used between t...

Page 69: ...d query strings through user programs the instrument issues responses Two or more command strings can be chained together in one communication but they must be separated by a semi colon Only one query is permitted per communication but it can be chained to the end of a command The total communication string must not exceed 64 characters in length A command string is issued by the computer and inst...

Page 70: ...n more than 20 times per second When issuing queries or queries and commands together the user program should Properly format and transmit the query including terminators as one string Prepare to receive a response immediately Receive the entire response from the instrument including the terminators Guarantee that no other communication is started during the response or for 50 ms after it complete...

Page 71: ...with Visual Basic 6 0 VB6 on an IBM PC or compatible with a Pentium class processor A Pentium 90 or higher is recommended running Windows 95 or better with a serial interface It uses the COM1 communications port at 9600 Baud Use the following procedure to develop the Serial Interface Program in Visual Basic 1 Start VB6 2 Choose Standard EXE and select Open 3 Resize form window to desired size 4 On...

Page 72: ...t Public gSend as Boolean b Double Click on cmdSend Add code segment under Private Sub cmdSend_Click as shown in Table 6 4 c In the Code Editor window under the Object dropdown list select Form Make sure the Procedure dropdown list is set at Load The Code window should have written the segment of code Private Sub Form_Load Add the code to this subroutine as shown in Table 6 4 d Double Click on the...

Page 73: ...ts Loop Until gSend True Loop until Send button pressed gSend False Set Flag as false strCommand frmSerial txtCommand Text Get Command strReturn Clear response display strCommand UCase strCommand Set all characters to upper case If strCommand EXIT Then Get out on EXIT End End If frmSerial MSComm1 Output strCommand Term Send command to instrument If InStr strCommand 0 Then Check to see if query Whi...

Page 74: ...Serial Interface Program CLS Clear screen PRINT SERIAL COMMUNICATION PROGRAM PRINT TIMEOUT 2000 Read timeout may need more BAUD 9600 TERM CHR 13 CHR 10 Terminators are CR LF OPEN COM1 BAUD O 7 1 RS FOR RANDOM AS 1 LEN 256 LOOP1 LINE INPUT ENTER COMMAND or EXIT CMD Get command from keyboard CMD UCASE CMD Change input to upper case IF CMD EXIT THEN CLOSE 1 END Get out on Exit CMD CMD TERM PRINT 1 CM...

Page 75: ...TER COMMAND DISPFLD 3 1 3 Configures display field 3 to display input 1 in sensor units ENTER COMMAND FILTER 5 Query filter parameters for input 5 Monitor returns filter settings RESPONSE 1 08 08 term ENTER COMMAND INCRV 7 2 INCRV 7 Combination command Selects curve 2 for input 7 and then requests input 7 curve number RESPONSE 02 term The following are additional notes on using either Serial Inter...

Page 76: ...emory reset 4 Check all cable connections Intermittent Lockups 1 Check cable connections and length 2 Increase delay between all commands to 100 ms to make sure instrument is not being over loaded 6 3 IEEE 488 SERIAL INTERFACE COMMANDS Parameter conventions in the command list are enable A parameter with enable in the name uses these values 0 disabled or 1 enable status A parameter with status in ...

Page 77: ...et Date and Time 23 DATETIME Query Date and Time 23 DFLT Set To Factory Defaults 23 DISPFLD Set Display Field 23 DISPFLD Query Display Field 23 FILTER Set Filter 24 Command Function Page FILTER Query Filter 24 IEEE Set IEEE Interface 24 IEEE Query IEEE Interface 24 INCRV Set Input Curve 24 INCRV Query Input Curve 24 INPUT Set Input Control 25 INPUT Query Input Control 25 INTYPE Set Input Type 25 I...

Page 78: ...DE 4 16 EXE 7 128 PON 143 QESE Query the Configuration of Status Reports in the Standard Event Status Register Input QESE Returned ESE bit weighting Format nnn term Remarks The integer returned represents the sum of the bit weighting of the enable bits in the Standard Event Status Enable Register See the ESR command for a list of event flags QESR Query Standard Event Status Register Input QESR Ret...

Page 79: ...89 is the bit weighting sum for each bit Bit Bit Weighting Event Name 0 1 New Reading 3 8 Alarm 4 16 Error 6 64 SRQ 89 QSRE Query the Configuration of Status Reports in the Service Request Enable Register Input QSRE Returned SRE bit weighting Format nnn term Remarks The integer returned represents the sum of the bit weighting of the enabled bits in the Service Request Enable Register See the QSTB ...

Page 80: ...inus the deadband or 319 5 K Activates low alarm if Kelvin reading falls below 250 0 K and deactivates the alarm when the reading rises above 250 0 K plus the deadband or 251 0 K ALARM Query Input Alarm Parameters Input ALARM input Returned off on source high value low value deadband latch enable Format n n nn nnn nn nnn nn nnn n term Remarks Returns the alarm parameters of an input See ALARM comm...

Page 81: ...ositive only manual value If mode 2 this parameter is the output of the analog output Example ANALOG 2 0 1 5 1 100 0 0 0 term Sets analog output 2 to monitor Input 5 Kelvin reading with 100 0 K at 100 output 10 0 V and 0 0 K at 0 output 0 0 V ANALOG Query Analog Output Parameters Input ANALOG output Returned bipolar enable mode input source high value low value manual value Format n n n n nn nnn n...

Page 82: ...mber Limited to 10 characters format Specifies curve data format 2 V K 3 Ohm K 4 log Ohm K limit value Specifies curve temperature limit in Kelvin coefficient Specifies curve temperature coefficient 1 negative 2 positive Example CRVHDR 21 Custom 00011134 2 325 0 1 term Configures User Curve 21 input 1 user curve with a name of CUSTOM serial number 00011134 data format of volts vs Kelvin upper temp...

Page 83: ...m DATETIME Query Date and Time Input DATETIME Returned MM DD YY HH mm SS Format nn nn nn nn nn nn term Remarks Returns date and time See the DATETIME command for parameter descriptions DFLT Set to Factory Defaults Input DFLT 99 Returned Nothing Remarks Sets all configuration values to factory defaults and resets the instrument The 99 is required to prevent accidentally setting the unit to defaults...

Page 84: ... no terminator EOI enable Disables enables the EOI mode 0 Enabled 1 Disabled address Specifies the IEEE address Example IEEE 1 0 4 term After receipt of the current terminator the instrument responds to address 4 uses CR LF as the new terminator and uses EOI mode IEEE Query IEEE 488 Interface Parameters Input IEEE Returned terminator EOI enable address Format n n nn term Remarks Returns IEEE inter...

Page 85: ...YPE Query Input Type Parameters Input INTYPE input group Returned sensor type Format n term Remarks Returns input type parameters input group Specifies input group to query A inputs 1 4 B inputs 5 8 sensor type Specifies input sensor type Valid entries 0 2 5V Diode 2 250Ω Platinum 4 5kΩ Platinum 1 7 5V Diode 3 500Ω Platinum 5 Cernox KEYST Query Keypad Status Input KEYST Returned keypad status Form...

Page 86: ...See LINEAR command for returned parameter descriptions input specifies input to query 1 8 LOCK Configure Lock out and Lock out Code Input LOCK off on code Returned Nothing Remarks Configures keypad lock out and lock out code off on Disables enables the keypad lock out code Specifies lock out code 000 999 Example LOCK 1 123 term Enables keypad lock out and sets the code to 123 LOCK Query Lock out a...

Page 87: ...Continuous 4 Print Event overwrite Specifies overwrite mode 0 Do not overwrite data 1 overwrite data start Specifies start mode 0 Clear 1 Continue period Specifies period in seconds 1 3600 If mode is Print Continuous minimum period is 10 readings Specifies number of readings per record 1 8 LOGSET Query Logging Parameters Input LOGSET Returned mode overwrite start period readings Format n n n nnnn ...

Page 88: ...4 linear data Example MNMX 1 3 term Input 1 min max function processes data from input sensor units reading MNMX Query Minimum and Maximum Input Function Parameters Input MNMX input Returned source Format n term Remarks Returns an input min max configuration input Specifies input to query 1 8 source Specifies input data to process through max min 1 Kelvin 2 Celsius 3 sensor units 4 linear data MNM...

Page 89: ...e 0 Off 1 On 2 Alarms input alarm Specifies which input alarm activates the relay when the relay is in alarm mode 1 8 alarm type Specifies the input alarm type that activates the relay when the relay is in alarm mode 0 Low alarm 1 High Alarm 2 Both Alarms Examples RELAY 3 2 3 0 term Relay 3 activates when Input 3 low alarm activates RELAY Query Relay Control Parameters Input RELAY relay number Ret...

Page 90: ...s point Example SCAL 1 21 SC12345 4 2 1 6260 77 32 1 0205 300 0 0 5189 term Generates a 3 point SoftCal curve from DT 470 and saves it in user curve 21 with serial number SC12345 SRDG Query Sensor Units Reading for a Single Input or all Inputs Input SRDG input Returned sensor units value Format nn nnn term Or if all units are queried Input 1 Sensor Units Value Input 2 Sensor Units Value Input 3 Se...

Page 91: ...ean the Model 218 periodically to remove dust grease and other contaminants as follows 1 Clean front back panels and case with soft cloth dampened with mild detergent and water solution NOTE Do not clean with aromatic hydrocarbons or chlorinated solvents They may react with the plastic materials used in the controller or the silk screen printing on the back panel 2 Clean surface of printed circuit...

Page 92: ...astic bags approved for storage of ESD material 6 Do not handle ESDS devices unnecessarily or remove from the packages until actually used or tested 7 3 FUSE DRAWER The fuse drawer supplied with the Model 218 holds the instrument line fuses and line voltage selection module The drawer holds two 5 20 mm time delay fuses It requires two good fuses of the same rating to operate safely Fuse ratings ar...

Page 93: ... the drawer holding the line voltage selector and fuses 5 Remove and discard both existing fuses Replace with proper Slow Blow time delay fuse ratings as follows 100 120 V 0 25 A T 250 V 5 20 mm 220 240 V 0 25 A T 250 V 5 20 mm 6 Re assemble line input assembly in reverse order 7 Verify voltage indicator in the line input assembly window 8 Connect instrument power cord 9 Turn power switch On l 7 6...

Page 94: ...lay 5 COM 3 Relay 1 NO 17 Relay 5 NO 4 Relay 2 NC 18 Relay 6 NC 5 Relay 2 COM 19 Relay 6 COM 6 Relay 2 NO 20 Relay 6 NO 7 Relay 3 NC 21 Relay 7 NC 8 Relay 3 COM 22 Relay 7 COM 9 Relay 3 NO 23 Relay 7 NO 10 Relay 4 NC 24 Relay 8 NC 11 Relay 4 COM 25 Relay 8 COM 12 Relay 4 NO 26 Relay 8 NO 13 Analog 1 Signal 27 Analog 2 Signal 14 Analog 1 Gnd 28 Analog 2 Gnd Figure 7 4 Terminal Block Connectors ...

Page 95: ...ce connector pin location and signal names as viewed from the Model 460 rear panel C 218 7 5 eps PIN SYMBOL DESCRIPTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 DIO1 DIO2 DIO3 DIO4 EOI DAV NRFD NDAC IFC SRQ ATN SHIELD DIO5 DIO6 DIO7 DIO8 REN GND 6 GND 7 GND 8 GND 9 GND 10 GND11 GND Data Input Output Line 1 Data Input Output Line 2 Data Input Output Line 3 Data Input Output Li...

Page 96: ...B 25P 5 GND 7 GND 2 RD in 2 TD out 3 TD out 3 RD in 1 NC 4 RTS out 7 DTR tied to 4 5 CTS in 8 NC 8 DCD in 6 DSR in 20 DTR out 4 DTR out 6 DSR in 218 to PC Interface using Null Modem Adapter 218 DE 9P Null Modem Adapter PC DB 9P 5 GND 5 GND 2 RD in 3 TD out 3 TD out 2 RD in 1 NC 4 DTR out 6 DSR in 1 DCD in 4 DTR out 6 DSR in 7 DTR tied to 4 8 CTS in 8 NC 7 RTS out 9 NC 9 NC NOTE Same as null modem ...

Page 97: ... power line before performing this procedure Only qualified personnel should perform this procedure REMOVAL 1 Set power switch to off O and disconnect power cord from rear of unit 2 If attached remove 19 inch rack mounting brackets 3 Use 5 64 hex key to remove four screws attaching top panel to unit 4 Use 5 64 hex key to loosen four screws attaching bottom panel to unit 5 Carefully remove the back...

Page 98: ... avoid inducing an Electrostatic Discharge ESD into the device 1 Follow the top of enclosure REMOVAL procedure in Paragraph 7 10 2 Locate EPROM U17 M218 HEX or NOVRAM U24 on the main circuit board Note orientation of existing IC See Figure 7 7 3 Use IC puller to remove existing EPROM NOVRAM from socket 4 Noting orientation of new EPROM NOVRAM use an IC insertion tool to place new device into socke...

Page 99: ...Lake Shore Model 218 Temperature Monitor User s Manual Service 7 9 F 218 7 7 bmp Figure 7 7 Location of Internal Components ...

Page 100: ...nnect the Model 218 to the PC via the serial port Verify operational serial communication by sending the QIDN command and receiving the proper response from the Model 218 During the calibration process leave four 100 kΩ resistors attached to the input group not currently being calibrated Calibrate input group A first then repeat the process for input group B 7 13 3 Clear Calibration Send the CALCL...

Page 101: ...ration constant is 2 5 2 49945 1 00022 This gain calibration constant is provided back to the Model 218 using the GCAL command This constant is valid for all inputs of the group therefore GCAL must be sent 4 times assigning the constant to each input Once gain calibration constants for all ranges have been determined and provided back to the Model 218 the CALSAVE command is issued to save the cons...

Page 102: ...l inputs of the group are enabled PROCESS Via the interface obtain the RAWAD value of the 1st input To determine the calibration constant add the 500 Ω range zero offset constant to the value read and divide 250 by that value or 250 RAWAD reading zero offset constant For example if the value read was 1 24887 and the zero offset constant was 0 00009 the gain calibration constant is 250 1 24896 200 ...

Page 103: ...h 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 7 13 14 1 Analog Output Zero Adjust PURPOSE To adjust the zero offset error of the analog output amplifier to 0 V CONFIG The positive lead of the DVM is connected to the analog output positive terminal the negative lead ...

Page 104: ...iode 2 250Ω Platinum 4 5kΩ Platinum 1 7 5 V Diode 3 500Ω Platinum 5 Cernox value Zero Calibration Constant ZCAL Returns Value of Zero Calibration Constant for the Selected Input Input ZCAL input value Returned Returns value of zero calibration constant for the selected input and input configuration Remarks input Specifies which input to query zero calibration constant for Valid entries are 1 8 typ...

Page 105: ... Platinum 4 5kΩ Platinum 1 7 5V Diode 3 500Ω Platinum 5 Cernox RAWAD Querys Raw A D Value for the Selected Input Input RAWAD input Returned Raw A D value Format n nnnnnn term Remarks Returns 7 digit value of selected input reading Used for ZCAL and GCAL functions input Specifies which input to query Valid entries are 1 8 CALCLEAR Returns All Calibration Constants to Their Default Value Input CALCL...

Page 106: ...Lake Shore Model 218 Temperature Monitor User s Manual 7 16 Service This Page Intentionally Left Blank ...

Page 107: ...l Description of Options 8000 The CalCurve breakpoint table from a calibrated sensor loaded on a CD ROM for customer uploading 8001 218 The breakpoint table from a calibrated sensor stored in the instrument 8002 05 218 The breakpoint table from a calibrated sensor stored in a NOVRAM for installation at the customer location 8 3 ACCESSORIES Accessories are devices that perform a secondary duty as a...

Page 108: ... o rings Contains high molecular weight polymeric hydrocarbon additive which gives it a tenacious rubbery consistency allowing the grease to form a cushion between mating surfaces 9007 002 Indium Foil 5 pieces Indium is a semi precious non ferrous metal softer than lead and extremely malleable and ductile It stays soft and workable down to cryogenic temperatures May be used as a sealing gasket for...

Page 109: ...Lake Shore Model 218 Temperature Monitor User s Manual Accessories 8 3 C 218 8 1 bmp Figure 8 1 Model RM 1 2 Rack Mount Kit ...

Page 110: ...Lake Shore Model 218 Temperature Monitor User s Manual 8 4 Accessories C 218 8 2 bmp Figure 8 2 Model RM 2 Dual Rack Mount Shelf ...

Page 111: ...5 0 220 0 205 0 190 0 180 0 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 0 82405 0 84651 0 86874 0 87976 0 89072 0 90161 0 91243 0 92317 0 93383 0 94440 0 95487 0 96524 0 97550 0 98564 0 99565 1 00552 1 01525 1 02482 1 03425 1 04353 1 05630 1 06702 1 07750 1 08781 1 08953 1 09489 1 09864 1 10060 1 10263 170 0 160 0 150 0 145 0 140 0 135 0 130 0 125 0 120 0...

Page 112: ...6 5000 61 7000 67 2600 79 0900 99 2400 121 800 150 150 192 230 235 250 320 810 466 480 629 800 750 440 987 840 1162 70 1316 16 1486 52 1654 66 1820 35 1983 86 2162 56 2321 06 2477 12 2613 91 2765 66 2898 30 30 0 32 0 36 0 38 0 40 0 42 0 46 0 52 0 58 0 65 0 75 0 85 0 105 0 140 0 180 0 210 0 270 0 315 0 355 0 400 0 445 0 490 0 535 0 585 0 630 0 675 0 715 0 760 0 800 0 Table A 3 Standard DT 670 Diode...

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