Model 200 - Lake Shore Cryotronics, Inc.
Contents
1. Lake Shore Model 200 User s Manual INITIAL SETUP AND CHECKOUT PROCEDURE This procedure verifies basic unit operation 1 Verify proper wall mount power supply is used A wall mounted power supply is available that accommodates 90 130 VAC or 200 250 VAC operation The Model 200 requires a 24 Volt input CAUTION Connect temperature sensor s to unit rear before applying power Sensor damage may occur if connected with power on 2 Install temperature sensor s per recommendations in Paragraph 2 4 Route wiring to Model 200 Connect power plug to 24 Volt receptacle at unit rear then plug wall mounted power supply into power connection Upon power up the unit displays one of the following codes depending upon the curve selected CUO DT 470 CU1 CTI CU2 D Curve CU3 Precision Option If sensor connections are correct and exhibit no opens or shorts the temperature displays and the decimal point blinks The rate of the blinking corresponds to the update cycle Sensor connection problems cause one of two messages display OPEN Sensor connection loose polarity backward or not connected SHORT Wiring is shorted at some point between unit and sensor Upon successful completion of this abbreviated checkout procedure the unit is ready for normal operation 2 14 Installation Lake Shore Model 200 User s Manual CHAPTER 3 OPERATION 3 0 GENERAL This chapter desc2. USER S MANUAL Model 200 Temperature Monitor EL akeShore Lake Shore Cryotronics Inc 575 McCorkle Boulevard Westerville Ohio 43082 8888 USA E Mail Addresses sales lakeshore com service lakeshore com 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 Rev 1 2 P N 119 024 10 June 1999 Lake Shore Model 200 User s Manual LIMITED WARRANTY Lake Shore Cryotronics Inc henceforth Lake Shore the manufacturer warrants this product for a period of twelve 12 months from the date of shipment During the warranty period under authorized return of instruments or component parts to Lake Shore freight prepaid the company will repair or at its option replace an
3. interchangeable Curve 10 is programmed into all Lake Shore Temperature Controllers digital thermometers and temperature monitors DT 470 Series sensors come in five bands of tracking accuracy Standard Curve 10 TETE ITT Average Q qH Slope as 26 mV K i gt 12 1 10 D 0 10 20 30 40 50 60 e E g 5 08 gt p 06 g Average 04 O Slope Ze o 2 3 mV K 0 20 o 200 300 Temperature K kelvin CTI Curve For Customer convenience the Model 200 also supports the standard curve for CTl Cryogenics diodes D Curve Users of older Lake Shore DT 500 Series diode sensors can still use the Model 200 when set to D Curve Precision Option The Precision Option is the easiest way to combine the additional performance of a Lake Shore calibrated sensor with the Model 200 Temperature Monitor This option is a read only memory chip PROM with specific sensor calibration stored on it It improves combined sensor instrument accuracy to within 0 25K or better over the calibrated temperature range of the sensor The factory installs the 8001 200 Precision Option on instruments ordered with a calibrated sensor To use the instrument with an existing Lake Shore calibrated sensor Lake Shore requires the sensor model and serial numbers at the time of order The Model 8002 200 is for field installations o
4. 0 comes with several standard temperature response curves In applications where additional accuracy of a calibrated sensor is required order the Model 200 with a factory installed precision temperature response curve TG 120 diode sensors require a Model 200 with the precision calibration option Mounting the Model 200 is simple since it is packaged in a 1 8 DIN aluminum panel mount box The 200 S and 200 D Temperature Monitors are packaged in 1 4 DIN aluminum panel mount boxes 1 2 Introduction Lake Shore Model 200 User s Manual Model 200 Model 200 S Model 200 D eg IN e SEKR RW Lak eShor e 200 Temperature Monitor er Sensor A Sensor B BR LakeShore 200 S Temperature Monitor Channel A IJH ECI LakeShore 200 D Temperature Monitor C 200 1 1 eps Figure 1 1 Model 200 Temperature Monitor Series Introduction Lake Shore Model 200 User s Manual Table 1 1 Model 200 Specifications THERMOMETRY Input Display Model 200 One input one display Model 200 S Two inputs one display Model 200 D Two inputs two displays Measurement type Two lead Sensor Type Silicon or GaAlAs Diode Input Voltage Range 5 Volts Sensor Excitation 10 pA 0 2 Temperature Range 1 4 475 K with DT 470 Series Silicon Diodes 4 0 325 K with TG 120P or PL Diodes 4 500 K with TG 120 SD Electronic Accuracy with Si
5. 10 5 9 95 to 10 05 9 995 to 10 005 9to 11 9 9 to 10 1 9 99 to 10 01 9 995 to 10 005 7 to 13 9 7 to 10 3 9 97 to 10 03 9 995 to 10 005 1 0 0 1 0 0 0 1 0 0 0 With current source lx10 uA 2 10 Installation Lake Shore Model 200 User s Manual Current Source Dependence Continued If the output from a current source is not precisely 10 pA the error in temperature can be calculated by this relationship between the dV dT and dV dI values DT DI dV dl dV dT Note values dV dl and dV dT are derived at same temperature T Table 2 2 Typical DT 470 dV dI Values for Selected Temperatures T K dV dl approx 300 3000 Q 77 1000 Q 4 2 2800 Q 2 4 5 Measurement Errors Due To AC Noise Poorly shielded leads or improperly grounded measurement systems can introduce AC noise into the sensor leads In diode sensors the AC noise shifts the DC voltage measurement due to the diode non linear current voltage characteristics When this occurs measured DC voltage is too low and the corresponding temperature reading is high The measurement error can approach several tenths of a Kelvin To determine if this problem exists perform either procedure below 1 Place a capacitor across the diode to shunt induced AC currents Capacitor size depends on the noise frequency If noise is related to power line frequency use a 10 microfarad capacitor If AC coupled digital noise is suspecte
6. 8574 1 07460 1 02044 1 09020 1 05277 1 09700 1 08105 1 10580 1 09477 1 11160 1 10465 1 11900 1 11202 1 13080 1 11517 1 14860 1 11896 1 17200 1 12463 1 25070 1 13598 1 35050 1 21555 1 63590 1 29340 1 76100 1 36687 1 90660 1 44850 2 11720 1 64112 2 53660 1 68912 2 59840 1 69808 6 55360 6 55360 Appendix A A 1 Lake Shore Model 200 User s Manual Table A 2 CTI Diode Curve Break CTI Curve point No Temp K 1 320 0 0 2968 2 305 0 0 3382 3 295 0 0 3640 4 285 0 0 3911 5 280 0 0 4050 6 270 0 0 4341 7 250 0 0 4896 8 195 0 0 6408 9 165 0 0 7255 10 140 0 0 7971 11 130 0 0 8245 12 125 0 0 8376 13 115 0 0 8625 14 110 0 0 8769 15 100 0 0 9049 16 095 0 0 9184 17 090 0 0 9314 18 085 0 0 9440 19 077 4 0 9626 20 065 0 0 9958 21 060 0 1 0100 22 036 0 1 0747 23 020 0 1 1162 24 019 0 1 1290 25 018 0 1 1500 26 014 0 1 3161 27 012 0 1 3656 28 011 0 1 3850 29 010 0 1 4000 Appendix A NOTES Lake Shore is a technology leader in the development of cryogenic temperature sensors precision low temperature measurement and control instrumentation and magnetic measurement and test systems Since 1968 Lake Shore physicists material scientists and engineers have dedicated themselves to the development of tomorrow s technology today Lake Shore serves a worldwide network of Customers including university and national laboratories aerospace and other industries as well as many of the premier companies arou
7. L le Channel B ITU LI Bt akeShore 200 D Temperature Monitor H SS 2 6 Figure 2 5 Model 200 D Front Panel C 200 2 5 eps Installation Lake Shore Model 200 User s Manual Model 200 D Definitions Continued Descriptions of the Model 200 D rear panel are the same as the Model 200 except two complete sets of DIP switches see Paragraph 2 3 1 CAL trimpots and screw terminal connectors are provided The upper set applies to Channel A The lower set applies to Channel B The unit simultaneously displays the temperatures of both sensors There is only one POWER connector r A Channel A ET 3 KIC ee Tal CURVE 1 0 oe CURVE 0 Channel B OPTIONAL D POWER C ro 24 AT 4 POWER 0 amp amp 24 AO SS OO CAL 1 z 3 4 HEE ol ll Le Le lo tif i C 200 2 6 eps Figure 2 6 Model 200 D Rear Panel Installation 2 7 Lake Shore Model 200 User s Manual 2 4 SENSOR INSTALLATION RECOMMENDATIONS Abbreviated sensor installation recommendations for the Model 200 are included in this section Please refer to the Lake Shore Product Catalog for installation details and sensor specifications Call Lake Shore for copies of application notes or with questions or comments concerning sensor installation 1 Do not ground the sensor 2 Shield leads and con
8. NCIDENTAL OR CONSEQUENTIAL DAMAGES ARE EXPRESSLY EXCLUDED CERTIFICATION Lake Shore certifies that this product has been inspected and tested in accordance with its published specifications and that this product met its published specifications at the time of shipment The accuracy and calibration of this product at the time of shipment are traceable to the United States National Institute of Standards and Technology NIST formerly known as the National Bureau of Standards NBS or to a recognized natural standard TRADEMARK ACKNOWLEDGEMENT Manufacturers and sellers claim many designations as trademarks to distinguish their products Where those designations appear in this manual and Lake Shore was aware of a trademark claim the designations appear in initial capital letters with a or symbol CalCurve Carbon Glass Cernox Quad Lead and Quad Twist are trademarks of Lake Shore Cryotronics Inc Teflon is a trademark of DuPont De Nemours Apiezon is a trademark of Biddle Instruments Copyright 1992 1997 and 1999 Lake Shore Cryotronics Inc All rights reserved No portion of this manual may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the express written permission of Lake Shore A Lake Shore Model 200 User s Manual TABLE OF CONTENTS Chapter Paragraph Title Page T INTRODUCTION eweg S
9. connecting leads to any temperature sensor may differ the temperature between the active sensing element and the sample to which the sensor mounts This reflects as a real temperature offset between what is measured and the true sample temperature Eliminate such temperature errors with proper selection and installation of connecting leads To minimize heat flow through the leads select leads of small diameter and low thermal conductivity Phosphor bronze or Manganin wire is commonly used in sizes 32 or 36 AWG These wires have a fairly low thermal conductivity yet electrical resistance is not large enough to create measurement problems 2 8 Installation Lake Shore Model 200 User s Manual Connecting Leads To The Sensor Continued Thermally anchor lead wires at several temperatures between room temperature and cryogenic temperatures to guarantee no heat conduction through the leads to the sensor 2 4 3 Sensor Mounting Before installing a diode sensor identify which lead is the anode and which is the cathode When viewed with the base down and the leads towards the observer the anode is on the right and the cathode is on the left The Lake Shore DT 470 SD silicon diode sensor lead configuration is shown to the right For other sensors read accompanying literature or consult the manufacturer to positively identify sensor leads Lead identification should remain clear even after sensor installation Record the sensor serial number and
10. d digital circuits or interfaces use a 0 1 to 1 microfarad capacitor In either case if measured DC voltage increases there is induced noise in the measurement system 2 Measure AC voltage across the diode with an AC voltmeter or oscilloscope Most voltmeters do not have the frequency response to measure noise associated with digital circuits or interfaces which operate in the MHz range For a thorough discussion of this potential problem and the magnitude of error which may result request the paper Measurement System Induced Errors In Diode Thermometry J K Krause and B C Dodrill Rev Sci Instr 57 4 661 April 1986 from Lake Shore To greatly reduce potential AC noise connect twisted leads pairs between the measurement instruments and the diode sensors Use 32 or 36 AWG Lake Shore Duo Twist Cryogenic Wire which features phosphor bronze wire twisted at 3 15 twists per centimeter 8 twists per inch See the Lake Shore Product Catalog or contact Lake Shore for further information Installation 2 11 Lake Shore Model 200 User s Manual 2 5 SENSOR CURVE DEFINITION Sensor curves available with the Model 200 include Curve 10 CTI Curve D Curve and a factory installed Precision Option for a calibrated sensor After selecting the proper curve set the Model 200 rear panel DIP switch see Paragraph 3 2 Curve 10 Lake Shore DT 470 Series silicon diodes follow the same standard temperature response Curve 10 and are
11. ege Geer aiaa aaua oundo reese 1 1 1 0 General 1 1 1 1 Model 200 System Description ranrnnnvrnnnvrnrrvrnnnnnnennr 1 1 2 INSTALLATION ennnnennnsnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnnnnnnnvenennnnnnnnnennnennn 2 1 2 0 ET EE 2 1 2 1 Inspection and Unpackimg AA 2 1 2 2 Repackaging For Shipment srrrrvrnnnnrnnrvrnnnvrnrrvrnnnnnnennr 2 1 2 3 Front and Rear Panel Definitions nnnnnn1nnnnnnnnannnaaa 2 2 2 3 1 Model 200 Definitions nnnnnnnnnnnnnannnnnnnnnnnnnn nanana 2 2 2 3 2 Model 200 S Definitions rrrrrnnnnrrrrrnnnnnnnnvrrrnrrnnnnnnnn 2 4 2 3 3 Model 200 D Definitions rrrrrrrrrrrnrrrnrnrnrnrnrnrnnnrnnnnn 2 6 2 4 Sensor Installation Recommendations rrrrnnnrnrrrnnnnr 2 8 2 4 1 Two Lead Measurement Considerations 2 2 8 2 4 2 Connecting Leads AAA 2 8 2 4 3 Sensor Mounting renrnnrnrnnnnvnnvnvonenvnnrnronenvnnrnrenenvnnnnre 2 9 2 4 4 Current Source Dependence 2 10 2 4 5 Measurement Errors Due To AC Nose 2 11 2 5 Sensor Curve Definition rrrnnrrrrrrrnnnnnnnrrrrrrnnnnnnnnnrer 2 12 2 6 Power Conpnectons er eeni eno a A 2 13 2 7 Panel Mounting cecccceeceseeeeeseseceeeseeeeeeeseeeeeesseeeees 2 13 2 8 Initial Setup and Checkout Procedure 2 14 3 ORBRERATION ee vinina iivaa iania aeai 3 1 3 0 Generalities manogi me Kee deg e E S ed eek 3 1 3 1 Temperature Unit Selection rarrrnanrnnrnvrnenvnronrrnenvnnennn 3 1 3 2 Diode Curve Selection rrrrnnrrrrrrn
12. f the Precision Option in an existing Model 200 2 12 Installation Lake Shore Model 200 User s Manual Sensor Curve Definition Continued The Precision Option is required for Lake Shore TG 120 Series Gallium Aluminum Arsenide Diode Temperature Sensors 2 6 POWER CONNECTIONS The Model 200 accepts a broad power supply AC or DC voltage range from any polarity power supply If the Model 200 is ordered with a wall mount power supply a 24 Volt AC power supply is included The line cord from the wall mounted power supply has a power plug that inserts into the 24 Volt Connector on the Model 200 rear panel The Model 200 is off when not plugged in and on when plugged in Make sensor connections before applying power to the instrument The power for multiple Model 200s can be ganged together to a common on off switch using the Optional 24 Volt Power Input being the first two inputs on the screw terminal connector This is an input only and should not be used as a voltage tap 2 7 PANEL MOUNTING 1 Panel mount cutout dimensions Model 200 91 x 44 mm 3 58 x 1 72 in Model 200 S amp 200 D 91 mm square 3 58 in square Unplug the unit Use 1 16 inch hex wrench to remove two headless screws Remove two panel mount brackets by sliding towards rear of unit Place unit in panel cutout Slide two panel mount brackets into unit case Use 1 16 inch hex wrench to install two headless screws eh Zi BOO Installation 2 13 2 8
13. licon Diode Sensor 0 1 degree typical 0 2 degree maximum Accuracy with Calibrated Sensor 0 25 K Sensor Curves Curve 10 D Curve CTl Curve and Precision Option Curve One CalCurve for 200 200 S two for 200 D factory installed DISPLAY Type 4 Digit Red LED Display 14 2 mm 0 56 in high and unit annunciators Resolution 0 1 Kor C Units K or C Update Rate 3 updates per second REAR PANEL CONNECTORS AND SWITCHES Sensor Input Screw terminal Power Input Power jack accepts power plug compatible to Switchcraft S 760 or S 765 or screw terminal Configuration Switch 4 position DIP Switch to Select Curve and Temperature Unit GENERAL Ambient Temperature Range 15 35 C Power Requirements 20 35 VDC or 15 24 VAC 50 60 Hz 3 5 Watts Maximum Size Model 200 96 x 48 x 146 mm 3 78 x 1 89 x 5 75 in Model 200 S amp 200 D 96 x 96 x 146 mm 3 78 x 3 78 x 5 75 in Panel Mount Cutout Dimensions Model 200 91 x 44 mm 3 58 x 1 72 in Model 200 S amp 200 D 91 x 96 mm 3 58 x 3 58 in 1 4 Introduction Lake Shore Model 200 User s Manual CHAPTER 2 INSTALLATION 2 0 GENERAL This chapter covers Inspection and Unpacking Paragraph 2 1 Repackaging for Shipment Paragraph 2 2 Front and Rear Panel Definitions Paragraph 2 3 Sensor Installation Recommendations Paragraph 2 4 Sensor Definitions Paragraph 2 5 Power Connections Paragraph 2 6 Panel Mounting Paragraph 2 7 and Initial Setu
14. location DT 470 SD Diode Sensor Leads Cathode 7 ee Anode On the DT 470 SD the base is the largest flat surface It is sapphire with gold metalization over a nickel buffer layer The base is electrically isolated from the sensing element and leads make all thermal contact to the sensor through the base A thin braze joint around the sides of the SD package electrically connect to the sensing element Avoid contact to the sides with any electrically conductive material When installing the sensor make sure there are no electrical shorts or current leakage paths between the leads or between the leads and ground If IMI 7031 varnish or epoxy is used it may soften varnish type lead insulations so that high resistance shunts appear between wires if sufficient time for curing is not allowed Slide Teflon spaghetti tubing over bare leads when the possibility of shorting exists Avoid putting stress on the device leads and allow for thermal contractions that occur during cooling which could fracture a solder joint or lead if installed under tension at room temperature For temporary mounting in cold temperature applications apply a thin layer of Apiezon N Grease between the sensor and sample to enhance thermal contact under slight pressure The preferred method for mounting the DT 470 SD sensor is the Lake Shore CO Adapter Installation 2 9 Lake Shore Model 200 User s Manual Sensor Mounting Continued CAUTION Lake Sho
15. n The first switch labeled K C selects Kelvin or degrees Celsius for display The next two switches select the proper sensor curve as shown in the table below The four curve types are defined in Paragraph 2 5 The fourth switch is not used CURVE 1 CURVE 0 SETTING DT 470 CTl Curve D Curve Precision Option 2 2 Installation Lake Shore Model 200 User s Manual Model 200 Definitions Continued CAL Trimpot The CAL trimpot adjusts instrument calibration See Paragraph 4 4 for details Screw Terminal Connector The diode terminals are marked for the anode and for the cathode VREF and Shield are used during unit calibration See Paragraph 4 4 for details Shield also terminates the diode sensor cable shield Finally the power for multiple Model 200 s can be ganged together to a common on off switch using the Optional Power input which is the first two inputs on the screw terminal connector This is an input only and can not be used as a voltage tap ae N CO OPTIONAL e POWER 24 ADS SE POWER 9 x amp 24 AD S OO CAL a 1 2 3 4 i ol fol fol bo OPEN 0 Q e C 200 2 2 eps Figure 2 2 Model 200 Rear Panel Installation 2 3 2 3 2 Lake Shore Model 200 User s Manual Model 200 S Definitions The Model 200 S has one front panel control The Sensor A Sensor B switch selects which sensor data to display Both sensors mus
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17. nect shield wire to SHIELD on screw terminal connector only Do not connect shield at other end of cable 3 Keep leads as short as possible 4 Use twisted pair wire Use Lake Shore Duo Twist wire or equivalent for two wire or Quad Twist wire or equivalent for four wire applications 5 Thermally anchor lead wires 2 4 1 Two Lead Measurement Considerations In two lead measurement the leads measuring sensor voltage are also the current carrying leads The resultant voltage measured at the instrument is the sum of the temperature sensor voltage and the IR voltage drop within the two current leads In a cryogenic environment the heat flow down the leads is of critical concern so wire of small diameter and significant resistance per foot is preferred to minimize heat flow Consequently a voltage drop within the leads may exist Expect some loss in accuracy since the voltage measured at the voltmeter is the sum of the sensor voltage and the voltage drop across the connecting leads The exact measurement error depends on sensor sensitivity and variations resulting from changing temperature For example a 10 Q lead resistance results in a 0 1 mV voltage error The resultant temperature error at liquid helium temperature is only 3 mK but because of the lower sensitivity dV dT of the diode at higher temperatures it becomes 10 mK at liquid nitrogen temperature 2 4 2 Connecting Leads To The Sensor Excessive heat flow through
18. ng Software Replacement The microprocessor IC U10 contains the Model 200 operating software See Item 10 in Figure 4 1 Use the following procedure to replace the operating software IC CAUTION To avoid damaging the unit disconnect unit from power supply before performing this procedure Disconnect power plug and screw terminal connector from unit rear 2 Remove four screws attaching rear panel to unit 3 Note location of PCB s in slots Ensure DIP switch remains attached to socket 4 Locate IC U10 on main circuit board Note orientation of existing EPROM circular notch on front of IC 5 Use IC puller to remove existing IC from socket 6 Noting orientation of new IC use IC insertion tool to place new IC into socket 7 Slide PCB s into appropriate slot and replace rear panel 8 Reconnect power plug and screw terminal connector to unit rear Service 4 1 Lake Shore Model 200 User s Manual C 200 4 1 eps Figure 4 1 Location of Fuse and Jumpers Service Lake Shore Model 200 User s Manual 4 3 MODEL 200 PCB DESCRIPTION Below is a brief description of major components on the Model 200 Printed Circuit Board PCB See Figure 4 1 1 Microprocessor ROM U10 This integrated circuit is a combination microprocessor program memory and Precision Option Curve if present Note orientation notch in Figure 4 1 2 Test Point 1 TP1 Corresponds to the Shield pin on the rear panel c
19. nnrrnvrrrrvrnnnnnnnnrnvnnnnnn 3 1 3 3 Blinking Decimal Point 3 1 3 4 Front Panel Operation 3 2 Ay SERVIGE r An DANNE 4 1 4 0 General EE a ihe 4 1 4 1 General Troubleshbooting 4 1 4 2 Operating Software Heplacement 4 1 4 3 Model 200 PCB Description rrranvnnonrnnonvnnenrrnrnvnnenrnnen 4 3 4 4 Calibration eidele tes 4 3 APPENDIX A CURVE TABLES eennrennnnnnnnvnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnnne A 1 Table of Contents Lake Shore Model 200 User s Manual LIST OF ILLUSTRATIONS Figure No Title Page 1 1 Model 200 Temperature Monitor Gerles 1 3 2 1 Model 200 Front Panel 2 2 2 2 Model 200 Rear Panel 2 3 2 3 Model 200 S Front Panel 2 4 2 4 Model 200 S Rear Panel 2 5 2 5 Model 200 D Front Panel 2 6 2 6 Model 200 D Rear Panel rnnnnnnnnnnonnnnnnrrnnnnnnnnrrnnnnrrrnnnnnnnrrnnnn 2 7 4 1 Location of Fuse and JUmpers rrerrrnnvrnrrvvvrnnrnvrvrennrrnrnnrrrnvren 4 2 LIST OF TABLES Table No Title Page 1 1 Model 200 Specifications sseeeeeeeeeeeee eee eeee eer eeereeenneenere neee 1 4 2 1 Effect of Current Variation on Diode Temperature 2 10 2 2 Typical DT 470 dV dl Values for Selected Temperatures 2 11 A 1 Lake Shore Standard Diode Cumes A 1 Ac2 CTI Diode er IT A 2 ii Table of Contents Lake Shore Model 200 User s Manual CHAPTER 1 INTRODUCTION 1 0 GENERAL The Model 200 was designed and manufactured in the United States of America by Lake Shore Cryotronics Inc The Model 200 features the f
20. nsors temperature data is displayed Both sensors must conform to the same diode curve The 4 digit red LED displays the selected temperature in Kelvin K or degrees Celsius C See Figure 2 3 The Model 200 D has no front panel controls Two 4 digit red LEDs simultaneously display temperatures in Kelvin K or degrees Celsius C In essence the Model 200 D operates as two independent Model 200 units with a common power supply See Figure 2 5 3 2 Operation Lake Shore Model 200 User s Manual CHAPTER 4 SERVICE 4 0 GENERAL This chapter cover General Troubleshooting Paragraph 4 1 Operating Software Replacement Paragraph 4 2 the Model 200 Printed Circuit Board PCB Paragraph 4 3 and Calibration Paragraph 4 4 4 1 GENERAL TROUBLESHOOTING If there is no power first verify that 24 VAC is present Next check the fuse Open unit remove fuse and test fuse with ohmmeter Do not rely on visual inspection of fuse See Figure 4 1 The fuse rating is 200 mA Slow Blow 5 mm by 20 mm Upon power up the sensor curve displays where CUO DT 470 CU1 CTI CU2 D Curve or CU3 Precision Option If sensor connections are correct the temperature displays and the decimal point blinks If there is a problem one of two messages display OPEN sensor connection is loose polarity backward or not connected or SHORT wiring is shorted at some point between unit and sensor 4 2 Operati
21. ollowing e Bright 4 Digit LED Display of Temperature in K or C e Temperature Range 1 4 K to 475 K 271 C to 202 C e Resolution of 0 1 K or C e Overall Accuracy with Calibrated Sensor of 0 25 K e Standard Temperature Response Curves Plus Memory for Precision Curve Option for a Calibrated Sensor e Sensor Connections made to Screw Terminal Adapter e Flexible Power Supply Requirement We welcome comments on this manual Although we try to keep it error free some may occur To report an error describe it briefly and include the appropriate paragraph figure table and page number Send comments to Lake Shore Cryotronics Attn Technical Publications 575 McCorkle Blvd Westerville Ohio 43082 8888 This manual is subject to change without notice 1 1 MODEL 200 SYSTEM DESCRIPTION The Model 200 Temperature Monitor is a microcontroller based instrument which measures temperature It is designed to use Lake Shore DT 470 Series and TG 120 Series diode sensors The Model 200 displays the temperature reading of one diode sensor The Model 200 S has two inputs and one display The user selects the input to display by means of a front panel switch The diode sensors must conform to the same temperature response curve The Model 200 D has two inputs and two displays The readings of both diode sensors continuously display Each sensor can have its own temperature response curve See Figure 1 1 The Model 200 Temperature Monitor co
22. onnector J4 3 Test Point 2 TP2 Corresponds to the VREF pin on the rear panel connector J4 4 Connector J3 4 pin jumper connection for Model 200 S only 5 Connector J4 Screw terminal connector 6 Trimpot R14 Calibration trimpot Accessible from rear panel 7 DIP Switch S1 Accessible from rear panel Selects temperature units and curve settings The fourth switch is not used 8 Connector J2 Power jack used to connect an external 24 Volt power supply 9 Connector J1 2 pin jumper connection for Model 200 D only 10 Fuse F1 200 mA Slow Blow 5 mm by 20 mm 4 4 CALIBRATION Calibrate the unit from the rear panel Monitor the voltage between VREF and Shield on the rear panel screw terminals with a good quality high input impedance voltmeter Adjust the CAL trimpot for a reading of 2 500 VDC Alternatively a bare PCB may also be calibrated by monitoring TP1 Shield and TP2 VREF Service 4 3 Lake Shore Model 200 User s Manual This Page Intentionally Left Blank Service Lake Shore Model 200 User s Manual APPENDIX A MODEL 200 CURVE TABLES Table A 1 Lake Shore Standard Diode Curves Break DT 470 Curve 10 point No Temp K Voltage Temp K Voltage 0 00000 0 00000 0 19083 0 09032 0 24739 0 12536 0 36397 0 18696 0 42019 0 29958 0 47403 0 42238 0 53960 0 56707 0 59455 0 68580 0 73582 0 76717 0 84606 0 83541 0 95327 0 89082 1 00460 0 94455 1 04070 0 9
23. p and Checkout Paragraph 2 8 2 1 INSPECTION AND UNPACKING 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 Open the shipping containers Use the packing list included with the system to verify receipt of the instrument sensor accessories and manual Inspect for damage Inventory all components supplied before discarding any shipping materials If there is freight damage to the instrument file proper claims promptly with the carrier and insurance company and notify Lake Shore Notify Lake Shore immediately of any missing parts Lake Shore cannot be responsible for any missing parts unless notified within 60 days of shipment See the standard Lake Shore Warranty on the A Page immediately behind the title page 2 2 REPACKAGING FOR SHIPMENT To return the Model 200 or accessories for repair or replacement obtain a Return Goods Authorization RGA number from Technical Service in the United States or from the authorized sales service representative from which the product was purchased Instruments may not be accepted without a RGA number When returning an instrument for service Lake Shore must have the following information before attempting any repair Instrument model and serial number User name company addre
24. re will not warranty replace any device damaged by user designed clamps or solder mounting For semi permanent mountings use Stycast epoxy instead of Apiezon N Grease NOTE Do not apply Stycast epoxy over the DT 470 SD package sensor stress may shift the readings In all cases periodically inspect the sensor mounting to verify good thermal contact to the mounting surface is maintained 2 4 4 Current Source Dependence This paragraph addresses the effects of current source accuracy on temperature measurement accuracy Although the Model 200 has an accurate internal current source it is important to understand the relationship between current variation and measurement accuracy Diode sensors possess a non linear forward current voltage characteristic Consequently the forward voltage variation with changing current for diodes is smaller than for resistance temperature sensors which have linear current voltage characteristics Below 30 K the sensitivity dV dT of Lake Shore diode temperature sensors increases by an order of magnitude over sensitivities at higher temperatures The slope dV dl of the l V curves stays relatively constant Both characteristics reduce even further the effect of any change in forward bias current on temperature measurement accuracy Refer to Tables 2 1 and 2 2 Table 2 1 Effect of Current Variation on Diode Temperature Measurement Accuracy T K Al MA Acc Range yA Error K 9 5 to
25. ribes the front panel controls for each of the three models in Paragraphs 3 1 thru 3 3 3 1 TEMPERATURE UNIT SELECTION The temperature scale displayed on the front panel is selected by a DIP Switch labeled K C on the rear panel Depress the top portion of the switch closed to select degrees Celsius Depress the bottom portion of the switch open to select Kelvin ro SS SS SKOO 1 2 3 4 IO Ki m z 3 2 DIODE CURVE SELECTION Sensor curves available with the Model 200 include Curve 10 CTl Curve D Curve and a factory installed Precision Option See Paragraph 2 5 for a definition of sensor curves The diode curve selected by the position of the two DIP Switches labeled CURVE 1 and CURVE 0 on the rear panel Depress the top portion of the switch to select closed and the bottom portion of the switch to select open CURVE 1 CURVE 0 SETTING DT 470 CTl Curve D Curve Precision Option 3 3 BLINKING DECIMAL POINT The best indicator of a correctly functioning unit is a blinking decimal point The decimal point blinks at a rate corresponding to the unit update rate about 3 times per second Operation 3 1 Lake Shore Model 200 User s Manual 3 4 FRONT PANEL OPERATION The Model 200 has no front panel controls The 4 digit red LED displays the temperature in Kelvin K or degrees Celsius C See Figure 2 1 The Model 200 S has one front panel control The Sensor A Sensor B switch is used to select which of two se
26. ss and phone number Malfunction symptoms Description of system Returned Goods Authorization RGA number OUR ONS Repack the system in its original container if available Affix shipping labels and FRAGILE warnings Write RGA number on the outside of the container or on the packing slip If not available consult Lake Shore for shipping and packing instructions Installation 2 1 Lake Shore Model 200 User s Manual 2 3 FRONT AND REAR PANEL DEFINITIONS This paragraph defines front and rear panels of the Model 200 Paragraph 2 3 1 Model 200 S Paragraph 2 3 2 and Model 200 D Paragraph 2 3 3 2 3 1 Model 200 Definitions The Model 200 has no front panel controls The 4 digit red LED displays the temperature in Kelvin K or degrees Celsius C Select temperature units with the rear panel DIP switch See Figure 2 1 E e ElLakeShore 200 Temperature Monitor Q pr C 200 2 1 eps Figure 2 1 Model 200 Front Panel The rear panel consists of the 24 Volt power input connector DIP Switch CAL trimpot and screw terminal connector See Figure 2 2 24 Volt Power Input Connector The line cord from the wall mounted power supply has a power plug that inserts into the Model 200 rear panel The Model 200 is off when not plugged in and on when plugged in Make sensor connections before applying power to the instrument DIP Switch The DIP switch controls temperature display and curve selectio
27. t conform to the same temperature response curve The 4 digit red LED displays the selected temperature in Kelvin K or degrees Celsius C fi ITU Sensor A Sensor B eal akeShore 200 S Temperature Monitor XS Es 2 4 Figure 2 3 Model 200 S Front Panel C 200 2 3 eps Installation Lake Shore Model 200 User s Manual Model 200 S Definitions Continued The Model 200 S rear panel is the same as the Model 200 except The upper screw terminal connector applies to Sensor A The lower screw terminal connector applies to Sensor B The front panel switch selects between the two sensors Both sensors must conform to the same temperature response curve selected by the CURVE 1 and CURVE 0 DIP switches There is only one POWER connector and DIP Switch see Paragraph 2 3 1 ae SCH Sensor A Q OPTIONAL POWER re AS W Ww POWER OZ 2AS x33 CAL C 200 2 4 eps Figure 2 4 Model 200 S Rear Panel Installation 2 5 2 3 3 Lake Shore Model 200 User s Manual Model 200 D Definitions The Model 200 D has no front panel controls Two 4 digit red LEDs simultaneously display temperatures in Kelvin K or degrees Celsius C In essence the Model 200 D operates as two independent Model 200 units with a common power supply ie 4975 IL
28. upled with the DT 470 Series or TG 120 Series diode sensors offers outstanding performance and advantages over traditional thermocouple solutions In the cryogenic temperature range the diode sensor offers a much higher signal and better sensitivity repeatability and accuracy than a thermocouple The DT 470 Series sensors follow the same temperature response curve Curve 10 In most applications they are interchangeable with no need to reconfigure monitors TG 120 Series sensors which are more sensitive than DT 470 Series sensors at temperatures below 50 K are recommended for magnetic fields up to 5 tesla Introduction 1 1 Lake Shore Model 200 User s Manual Model 200 System Description Continued Diode sensors come in several packaging formats for easy mounting Unlike a thermocouple the lead wire in a diode measurement is not the active sensor component using an additional connector to bring out the sensor signal from a cryogenic and or vacuum system does not degrade the measurement Finally the diode sensor does not require any room temperature compensation The Model 200 excites the diode sensor with a 10 uA current source An analog to digital converter reads the sensor voltage and sends the reading to a microcontroller The microcontroller uses the selected temperature response curve stored in memory to convert sensor voltage to temperature The computed temperature displays on the bright front panel LED display The Model 20
29. y part found to be defective in material or workmanship without charge to the Owner for parts service labor or associated customary shipping cost Replacement or repaired parts will be warranted for only the unexpired portion of the original warranty All products are thoroughly tested and calibrated to published specifications prior to shipment Calibration Certifications are offered for six month periods only Where such documentation must be updated a re certification service is offered by Lake Shore at a reasonable cost LIMITATION OF WARRANTY This warranty is limited to Lake Shore products purchased and installed in the United States This same protection will extend to any subsequent owner during the warranty period It does not apply to damage caused by accident misuse fire flood or acts of God from failure to properly install operate or maintain the product in accordance with the printed instructions provided This warranty does not apply to defects resulting from improper or inadequate maintenance unauthorized modification or misuse operation outside of the environmental specifications for any product or part or buyer supplied software interfacing THIS WARRANTY IS IN LIEU OF ANY OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WHICH ARE EXPRESSLY EXCLUDED THE OWNER AGREES THAT LAKE SHORE S LIABILITY WITH RESPECT TO THIS PRODUCT SHALL BE SET FORTH IN THIS WARRANTY AND I
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