Model No. 100-101 - Lake Shore Cryotronics, Inc.
Contents
1. USER S MANUAL Model 100 101 Battery Povvered Current Source TEST ka OFF m CURRENT OUTPUT S Oo LakeShor e 100 Current Source LakeShore 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 4 P N 119 013 4 June 2002 Model 100 101 Current Source Users Manual LIMITED VVARRANTY Lake Shore Cryotronics Inc henceforth Lake Shore the manufacturer warrants this product to be free from defects in material and workmanship for a period of 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 any part found to be defective in material or workmanship without charge to the Owner for parts2. Gently separate top half of enclosure from bottom half and front panel 2 Remove factory installed programming resistor R11 by clipping its leads See Model 100 101 PCB Layout 3 Install new programming resistor by soldering it to the turrets provided on the circuit board Recalibrate unit See Calibration 5 Replace top of enclosure screws and feet Resume normal operation CALIBRATION This instrument has been thoroughly tested and calibrated to published specifications prior to shipment However periodic recalibration is recommended every six months to ensure accuracy Recalibration is also required if the instrument is reprogrammed to a different output current Either of the following calibration methods are acceptable 12 Model 100 101 Current Source Users Manual COPYRIGHT 1991 LSCI 3111 6801 MODEL 100 CURRENT SOURCE N C lE OJ a 2 SL 7 8 5 H Er k Eoo les Te TO H R11 R101 N o J1 18 G 8 Programming Resistor R11 Soldering Turrets for New Programming Resistor Current Adjustment Trimpot R7 Model 100 101 PCB Layout Model 100 101 Current Source Users Manual Current Calibration Output current calibration uses the DC Ampere Range of a digital multimeter DMM and requires a DMM with 4 4 digit resolution or better and a 100 kQ load resistor NOTE If outpu
3. service labor or associated customary shipping cost Replacement or repaired parts will be warranted for only the unexpired portion of the original warranty or 90 days whichever is greater All products are thoroughly tested and calibrated to published specifications prior to shipment Calibration Certifications are offered for 12 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 or Internationally through our approved distribution agents This same protection will extend to any subsequent owner during the warranty period It does not apply to damage resulting from improper or inadequate maintenance unauthorized modification or misuse or operation outside of the environmental specifications It does not apply to damage caused by accident misuse fire flood or acts of God or from failure to properly install operate or maintain the product in accordance with the printed instruction provided 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 incidental or consequential damages are expressly excluded CERTIFIC
4. 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 CAUTION Use a heat sink when soldering lead wires CAUTION Lake Shore will not warranty replace any device damaged by user designed clamps or solder mounting NOTE Do not apply Stycast epoxy over the DT 470 SD package sensor stress may shift the readings For semi permanent mountings use Stycast epoxy instead of Apiezon N Grease In all cases periodically inspect the sensor mounting to verify good thermal contact to the mounting surface is maintained 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 Model 100 101 Current Source Users Manual To determine if this problem exists perform either of the follovving procedures 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 uF capacitor If AC coupled digital noise is suspect
5. 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 akRWON gt BATTERY REPLACEMENT 1 The battery compartment is located on the bottom of the unit Gently press the ribbed area marked OPEN and slide the battery cover in the direction of the arrow 2 Model 100 Only Install the 4 AA batteries Match the polarity markings in the battery compartment 3 Model 101 Only Snap the single 9 volt battery on the battery connector and place it into the battery compartment If the Battery Test LED does not light or appears dim when the switch is pushed to the Battery Test position replace the batteries SENSOR INSTALLATION RECOMMENDATIONS Although the Model 100 101 acts as a current source for any application it can provide the 10 pA excitation current for Lake Shore 400 Series 500 Series and TG 120 Diode Sensors See the Lake Shore Product Catalog for installation details and sensor specifications Call Lake Shore for copies of application notes or sensor installation questions Model 100 101 Current Source Users Manual Although a sensor is not provided with the Model 100 101 below are general recommendations on sensor installation 1 Do not ground the sensor 2 Shield leads and connect shield wire to SHIELD on screw terminal connector only Do not connec
6. unit Gently separate top half of enclosure from bottom half and front panel Using DMM measure true resistance of load resistor If load is a precision resistor accurate to 0 01 measuring is not necessary Place load resistor between the front panel CURRENT OUTPUT terminals Connect the DMM HI terminal to the CURRENT OUTPUT terminal and the DMM LO terminal to the CURRENT OUTPUT terminal 5 Select DC Voltage on the DMM 6 Adjust the CURRENT ADJ trimpot on the Model 100 101 circuit 15 board until the DMM reads a voltage equal to V For example if desired current is 10 pA and the load resistor was measured at 100 21 KQ adjust trimpot until voltage reads 1 0021 V load desired current x load resistance Replace top of enclosure screws and feet Resume normal operation Model 100 101 Current Source Users Manual wo NOTES c3 0 Ta Ell aheShore Lake Shore Cryotronics Inc 575 McCorkle Blvd Westerville Ohio 43082 8888 USA Fax 614 891 1392 Phone 614 891 2243 E Mail Addresses sales lakeshore com service lakeshore com Visit Our Website www lakeshore com
7. 100 uses four AA cells to provide maximum battery life The Model 101 uses a single 9 volt battery Other features include e A Battery Test switch and LED to alert users when battery is low e Compact design in a sturdy polystyrene enclosure with an easily accessible battery compartment Model 100 101 Specifications Output Current 10 pA factory set internally programmable from 1 UA to 1 mA Accuracy 0 05 of output at 10 A Temperature Coefficient 0 005 of output per C Compliance Voltage 2 5 V Model 100 5 0 V Model 101 Load Regulation lt 0 01 change in output current from 1 to 100 of compliance voltage Connections Current output via standard banana jacks Ambient Temperature Range 15 35 C 59 95 F Battery 4 AA Alkaline Model 100 one 9 V Alkaline Model 101 Battery Life Continuous use at 10 uA 1 year Model 100 6 months Model 101 Size 95 x 33 x 158 mm 3 7 x 1 3 x 6 2 inches Weight with batteries 0 3 kilograms 0 7 pounds NOTES 1 Product Specifications are subject to change without notice 2 The electrical specifications given are for a unit operating at the factory preset 10 pA current output reprogramming to a different output current may affect some specifications Model 100 101 Current Source Users Manual INSTALLATION INSPECTION AND UNPACKING Inspect shipping containers for external damage Make all claims for damage apparent or concealed or partial loss of sh
8. ATION 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 Copyright 1994 1997 1999 and 2002 by Lake Shore Cryotronics Inc All rights reserved No portion of this manual may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the express written permission of Lake Shore A Model 100 101 Current Source Users Manual DECLARATION OF CONFORMITY Lake Shore Cryotronics Inc 575 McCorkle Blvd Westerville OH 43082 8888 Hereby declares the equipment specified conforms to the following Directives and Standards Application of Council Directives 89 336 EEC Standards to which Conformity is declared EN55022 EN50082 1 Type of Equipment Battery Powered Current Source Model Number 100 or 101 4 Meg 8 407 John M Swartz Date President Lake Shore Cryotronics Inc Model 100 101 Current Source Users Manual INTRODUCTION Lake Shore Cryotronics Inc designed and manufactures the Model 100 101 in the United States of America We welcome comments concer
9. ed digital circuits or interfaces use a 0 1 to 1 uF capacitor In either case if measured DC voltage increases there is induced noise in the measurement system 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 Refer to the Lake Shore Product Catalog or contact Lake Shore for further information Model 100 101 Current Source Users Manual OPERATION FRONT PANEL FEATURES AND FUNCTIONS Function Switch This switch determines the operating state of the instrument It has three positions 1 In the center position the unit is off and no current is applied to the output terminals 2 In the right hand position the unit is on and operating as a current source 3 Push and hold the switch in the left hand position to perfo
10. ipment 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 REPACKAGING FOR SHIPMENT To return the Model 100 101 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 Model 100 101 Current Source Users Manual Instrument model and serial number User name company address and phone number Malfunction symptoms Description of system Returned Goods Authorization RGA number Repack the system in its
11. ning this manual Although we try to keep it error free some may occur To report a specific problem describe it briefly and include the appropriate 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 GENERAL DESCRIPTION The Models 100 and 101 battery powered DC current sources provide very stable output current without noise commonly associated with AC line powered instruments They combine the convenience of a portable hand held device and the performance of a benchtop unit They are well suited for field maintenance and periodic sensor monitoring They are also valuable when even a small amount of line frequency noise will degrade measurements The Model 100 and 101 provide constant current through a sensor connected across the output terminals Monitor voltage across the sensor to derive a corresponding temperature or other property Output current is factory preset at 10 pA for both units but may be reprogrammed to any value between 1 uA and 1 mA by changing a resistor inside the instrument The Model 100 2 5 volt compliance is well suited for silicon diode applications including Lake Shore DT 470 Series Diodes The Model 101 5 0 volt compliance is required for Lake Shore TG 120 GaAlAs diodes or to connect two DT 470 diode sensors in series Model 100 101 Current Source Users Manual The Model
12. powered voltmeters etc possibly affecting system accuracy See Measurement Errors Due To AC Noise for information on reducing AC noise pickup Unlike other Lake Shore current sources the Test LED does not function as a compliance indicator If your voltage measurement across the sensor is above the compliance specification of the current source 2 5 V for the Model 100 or 5 0 V for the Model 101 the unit is operating out of compliance This means the current through the load is no longer at its rated level and the voltage reading is invalid 10 Model 100 101 Current Source Users Manual Model 100 101 Current Source sr OFF gt CURRENT OUTPUT V dr en oltmeter O O Q Q Not Supplied El akeShore 100 Current Source One Banana Jack Supplied P N 106 009 _ I A R DVM Cable Not Supplied Sensor Not Supplied Typical Model 100 101 Application 11 Model 100 101 Current Source Users Manual SERVICE OUTPUT CURRENT REPROGRAMMING Although the Model 100 101 is factory preset 1V for a current output of 10 pA it can be set to l any value between 1 pA and 1 mA The equation to determine the value of the new programming resistor is program NOTE Reprogramming output current to higher values significantly reduces battery life Use the following procedure to change the programming resistor 1 To open unit remove the four rubber feet and four screws from bottom of unit
13. rm a BATTERY TEST Results display on the green LED BATTERY TEST LED When a battery test is performed the green test LED lights if the batteries are acceptable If the green LED does not light the batteries are either weak or installed incorrectly CURRENT OUTPUT Terminals These terminals accept a standard dual banana plug for connection to the voltmeter and sensor The polarity of the terminals is marked on the front panel BATTE sail OFF CURRENT OUTPUT l FIS Oe Ell akeShore 100 Current Source Model 100 101 Front Panel Model 100 101 Current Source Users Manual Operational Notes The Model 100 101 provides a constant current through the load i e sensor connected across its output terminals By monitoring the voltage across the sensor the corresponding temperature is derived from the response curve supplied with the sensor The following are additional operational notes 1 Although factory preset for output of 10 pA the instrument is programmable to any value between 1 pA and 1 mA See the procedure in Output Current Reprogramming To ensure accurate voltage readings across the sensor use a voltmeter with high input impedance to prevent the combined impedance sensor in parallel with voltmeter from causing a misleading measurement The battery powered Model 100 101 is isolated from noise better than many AC line powered instruments However some AC noise pickup may still occur from the test leads AC
14. 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 location DT 470 SD Diode Sensor Leads o Cathode Pi 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 Model 100 101 Current Source Users Manual 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
15. t current has been reprogrammed to other than the factory preset 10 pA use a load resistor of the same value as the new programming resistor Calibration accuracy is limited to the DMM current measurement accuracy 1 To open unit remove the four rubber feet and four screws from bottom of unit Gently separate top half of enclosure from bottom half and front panel Connect one end of load resistor to the front panel tCURRENT OUTPUT terminal Connect the DMM HI terminal to the other end of the load resistor and the DMM LO terminal to the CURRENT OUTPUT terminal 4 Select DC Amperes on the DMM 5 Adjust the CURRENT ADJ trimpot R7 on the Model 100 101 circuit board until the DMM reads 10 000 pA NOTE If output current has been reprogrammed to another value adjust to that value Replace top of enclosure screws and feet Resume normal operation 14 Model 100 101 Current Source Users Manual Voltage Calibration Output voltage calibration uses the DC Voltage Range of DMM and requires a DMM with 4 digit resolution or better and a 100 kQ load resistor NOTE If output current has been reprogrammed to other than the factory preset 10 pA use a load resistor of the same value as the new programming resistor Calibration accuracy is limited to voltmeter accuracy at 1 0000 volts and the accuracy of the load resistors resistance reading 1 To open unit remove the four rubber feet and four screws from bottom of
16. t shield at other end of cable 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 sensor and lead wires Connecting Leads To The Sensor Excessive heat flow through 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 Thermally anchor lead wires at several temperatures between room temperature and cryogenic temperatures to guarantee no heat conduction through the leads to the sensor Model 100 101 Current Source Users Manual Sensor Mounting Before installing a diode sensor identify vvhich 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
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