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Lake Shore Model 218 Temperature Monitor User’s Manual

Remote Operation

6-17

Table 6-5. Model 218 Interface Commands by Function

Command Function

Page

CLS Clear

Interface ...................................... 18

ESE

Set Std. Event Status Enable ............... 18

ESE?

Query Std. Event Status Enable ........... 18

ESR?

Query Std. Event Status Register ......... 18

IDN? Query

Identification .............................. 18

OPC Set

Operation

Complete ....................... 18

OPC? Query

Operation Complete .................. 19

RST Reset

Instrument .................................. 19

SRE

Set Service Request Enable ................ 19

SRE? Query

Service

Request Enable ............ 19

STB?

Query Status Byte ................................ 19

TST? Query

Self-Test

....................................

WAI Wait-To-Continue ................................. 19

ALARM Set

Alarm ............................................. 20

ALARM? Query

Alarm

.........................................

ALARMST? Query

Alarm Status .............................. 20

ALMB

Set Audible Alarm ................................. 20

ALMB? Query

Audible

Alarm Parameters ......... 20

ALMRST Reset

Alarms

........................................ 20

ANALOG Set

Analog Outputs .............................. 21

ANALOG? Query

Analog Outputs .......................... 21

AOUT? Query

Analog Output Data ................... 21

BAUD

Set Serial Interface Baud Rate ............. 21

BAUD?

Query Serial Interface Baud Rate ......... 21

CRDG? Query

Celsius Reading ........................ 22

CRVDEL Erase

Curve ...................................... 22

CRVHDR Set

Curve

Header ................................ 22

CRVHDR? Query

Curve Header ............................ 22

CRVPT Set

Curve Point .................................... 22

CRVPT?

Query Curve Point ................................ 23

DATETIME Set

Date and Time ............................... 23

DATETIME? Query

Date and Time ........................... 23

DFLT Set

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

INTYPE?

Query Input Type .................................. 25

KEYST? Query

Keypad Status ........................... 25

KRDG?

Query Kelvin Reading .......................... 25

LINEAR Set

Linear Equation .............................. 26

LINEAR? Query

Linear Equation ......................... 26

LOCK Set

Lock-out

and Code ........................ 26

LOCK? Query

Lock-out and Code .................... 26

LOG Turns

Logging

On and Off .................... 26

LOG? Query

Logging

Status

........................... 26

LOGNUM? Query

Last

Log

Record Stored ............. 26

LOGREAD

Set Log Records ................................... 27

LOGREAD? Query

Log

Record Parameters ............ 27

LOGSET Configure

Logging Parameters ............ 27

LOGSET? Query

Logging Parameters .................. 27

LOGVIEW? Query

Logged

Data Record ................. 27

LRDG? Query

Linear

Equation Input Data ........ 28

MNMX Set

Max/Min

.........................................

MNMX? Query

Max/Min

.....................................

MNMXRDG? Query Max/Min Data ............................ 28
MNMXRST Reset

Min/Max Function ...................... 28

MODE Set

Local/Remote Mode ....................... 28

MODE? Query

Local/Remote Mode .................. 28

RDGST? Query

Reading Status .......................... 29

RELAY Set

Relay.............................................. 29

RELAY? Query

Relay ......................................... 29

RELAYST? Query

Relay Status .............................. 29

SCAL Generate

SoftCal™ Curve ................... 30

SRDG? Query

Sensor

Units Reading ................ 30

Summary of Contents for 218S

Page 1: ...ment 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 appara...

Page 2: ...NTY 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 R...

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 61...

Page 4: ...ser 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 th...

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...

Page 6: ...xisting 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...

Page 7: ...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 REPL...

Page 8: ...ors 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 LIS...

Page 9: ...s 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 c...

Page 10: ...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...

Page 11: ...d 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 Platinum or all Silicon Diodes etc Sens...

Page 12: ...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 23...

Page 13: ...t 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 m 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 m 10 6 mK at 30 K 10 mK at 77 K...

Page 14: ......

Page 15: ...hey 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 an...

Page 16: ...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 outle...

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 m...

Page 18: ...ndards 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 t...

Page 19: ...esponse 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 i...

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 pre...

Page 21: ...il 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...

Page 22: ...te 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 a...

Page 23: ...tify 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 Pa...

Page 24: ...ing 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 Se...

Page 25: ...se 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 include...

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...

Page 27: ...al 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...

Page 28: ...hen 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 lead resistance times 10 A results in a 0 1 mV...

Page 29: ...ire 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...

Page 30: ...n 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 k The output is short protected so the instrument is not harmed if resistance is too small I...

Page 31: ...CREEN 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...

Page 32: ...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...

Page 33: ...og 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...

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 powe...

Page 35: ...n 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 INPU...

Page 36: ...ff 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 d...

Page 37: ...elected 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 st...

Page 38: ...s 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...

Page 39: ...nt 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 automatical...

Page 40: ...s 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 poi...

Page 41: ...e used to drive a resistance lower than 1 k 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 an...

Page 42: ...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 s...

Page 43: ...s 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 al...

Page 44: ...e 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 u...

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...

Page 46: ...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 pa...

Page 47: ...ry When entering 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 ent...

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 Exist...

Page 49: ...istance 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 appear...

Page 50: ...dard 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 g...

Page 51: ...put 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 m...

Page 52: ...on 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 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...

Page 54: ...e 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...

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 rea...

Page 56: ...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 i...

Page 57: ...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...

Page 58: ...evels 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 a...

Page 59: ...dware 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 con...

Page 60: ...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 desi...

Page 61: ...pecifications 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...

Page 62: ...d 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 Para...

Page 63: ...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 di...

Page 64: ...nt 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 N...

Page 65: ...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 Chan...

Page 66: ...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 qb...

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: ...TE 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...

Page 69: ...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...

Page 70: ...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 recei...

Page 71: ...ith 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 communica...

Page 72: ...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 su...

Page 73: ...s 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 a...

Page 74: ...erial 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...

Page 75: ...ER 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...

Page 76: ...mory 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...

Page 77: ...t 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 F...

Page 78: ...E 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 represe...

Page 79: ...9 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 Regis...

Page 80: ...nus 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 Alar...

Page 81: ...sitive 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...

Page 82: ...ber 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...

Page 83: ...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 Fact...

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 t...

Page 85: ...PE 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 se...

Page 86: ...ee 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 loc...

Page 87: ...ontinuous 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 P...

Page 88: ...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 For...

Page 89: ...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 i...

Page 90: ...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 Unit...

Page 91: ...an 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 cle...

Page 92: ...stic 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 Mo...

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 24...

Page 94: ...ay 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 N...

Page 95: ...e 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 DIO...

Page 96: ...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 N...

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...

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...

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: ...e 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...

Page 101: ...tion 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 s...

Page 102: ...s 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 range zero offset constant to the value read and divide 2...

Page 103: ...equire 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...

Page 104: ...V Diode 2 250 Platinum 4 5k Platinum 1 7 5 V Diode 3 500 Platinum 5 Cernox value Zero Calibration Constant ZCAL Returns Value of Zero Calibration Constant for the Selected Input Input ZCAL input valu...

Page 105: ...Platinum 4 5k Platinum 1 7 5V Diode 3 500 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 val...

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

Page 107: ...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 instr...

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...

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: ...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 9548...

Page 112: ...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 28...

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