9135 User Manual
Contents
1. Hart Scientific 9 9135 Infrared Thermometer Calibrator User s Guide Rev 5A2604 Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive e American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com www hartscientific com Subject to change without notice e Copyright 2005 Printed in USA Rev 542604 Table of Contents 1 Before You Start 1 1 Symbols Used o cu ee we a o e e 1 1 2 Safety Information seas se ses ka GO bee si eg gt 2 1 2 1 WAS s pe RS gs Sat SE SE Re EEan de Fa e 2 192 CAUTIONS re m Se Kake Satte deeb ch ett the ied even 3 1 3 Authorized Service Centers 222 vr vr vr krans 3 2 Introduction 7 3 Specifications and Environmental Conditions 9 3 1 SPECITICAIONS 4 sak ass KE de EE G GSE 9 32 Environmental Conditions 00000 ee 9 3 3 Warranty sc ov os Oa SSA SE ee ke Eas ES a 10 4 Quick Start 202443 jie He SRG ee eee eee es TD 4 1 Unpacking sacs kes s k raw ee Keke ee ee ANE G 11 4 2 SCCUP 24 6c piro e ote KG AT SE Gre FG 11 4 3 Power vb as Gah wba ee ene oe ee ee bee a ae Gade 11 5 Parts and Controls 13 Sil Back Panel ios ea sea e aS ee KG Gadget gt 13 3 2 Bottom se a u e ae EAE De a Kad Gen de 13 5 3 Top P nel lt s gas ke ft bog kG es RET SSE AM2. 13 5 4 Right Side Panel vr ee 14 6 General Operation i io o 17 6 1 O EEE EE EE SE 17 6 2 Setting the Temperature o Y 17 6 3 Target Ready Indicator oo o ce a coce ooo o 17 7 Controller Operation 19 8 Thermometer Calibration 21 8 1 IR Thermometer Calibration 21 8 2 RID Calibration zx RR Be ae ak M 21 9 Calibration Procedure 23 10 Maintenance 25 11 Troubleshooting 27 11 1 GE Comments xs sa vasker b e RRS Eee 27 11 1 1 EMC Directive isos Hades va ow Hew ay a Gre Fer Ge 27 11 1 2 Low Voltage Directive Safety o o o o 27 1 Before You Start Symbols Used 1 1 Before You Start Symbols Used Table 1 lists the International Electrical Symbols Some or all of these symbols may be used on the instrument or in this manual Table 1 International Electrical Symbols Symbol Description NU AC Alternating Current ING AC DC Battery Mm MM CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off O gt Ol eH On 9135 Infrared Thermometer Calibrator User s Guide Symbol Description G Canadian Standards Association US OVERVO
3. C 41 104 F Allow sufficient air circulation by leaving at least three inches of space between the instrument and nearby objects This is a precision instrument Although it has been designed for optimum durability and trouble free operation it must be handled with care The in strument should not be operated in excessively wet oily dusty or dirty environments It is important to keep the plate of the instrument clean and clear of any foreign matter If a mains supply power fluctuation occurs immediately turn off the in strument Severe power disturbances from brownouts and blackouts could damage the instrument Wait until the power has stabilized before re ener gizing the instrument The calibrator is equipped with an internal electrical fuse If a fuse blows it is likely caused by failure of another part If this occurs the calibrator should be returned for inspection Contact a Hart Scientific Authorized Service Center for assistance Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive 9135 Infrared Thermometer Calibrator User s Guide American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support O hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Ph
4. a calibrated standard RTD at each of the three set points The following are required e Standard calibrated RTD or thermistor 3 18 mm 0 125 diameter and at least 100 mm 4 sheath length and a readout device total uncertainty 0 2 C or better e Potentiometer adjustment tool The calibration procedure is as follows 1 Insert the standard RTD or thermistor fully into the test well of the 9135 through the test well access hole in the right panel 2 Set the set point to 50 C and let it stabilize Wait for the green ready LED to light 3 Adjust the potentiometer on the right one half turn at a time waiting one to two minutes between adjustments until the standard RTD or thermistor shows the temperature is close to 50 C within 0 2 C Adjust the potentiometer clock wise to increase the temperature or counter clockwise to decrease the temperature 4 Set the set point to 150 C and let it stabilize Wait for the green ready LED to light 5 Adjust the potentiometer on the left one half turn at a time waiting one to two minutes between adjustments until the standard RTD or thermistor shows the temperature is close to 150 C within 0 2 C Adjust the potentiometer clock wise to increase the temperature or counter clockwise to decrease the temperature 6 Set the set point to 100 C and let it stabilize Wait for the green ready LED to light 7 If the standard RTD or thermistor shows the temperature differs from 100 C by
5. with a close enough proximity that the target area of the thermometer is completely contained within the IR target of the 9135 This may depend on the particular IR thermometer be ing used DO NOT attempt to calibrate a thermometer unless it is close enough to ensure that its target area falls entirely within the IR target of the 9135 otherwise accuracy may be compromised e Remember that the IR target gets hot Be careful not to touch the IR target or let any object come into contact with it The IR target must be kept clean see Section 10 RTD Calibration The IR target plate of the 9135 has a 3 18 mm 0 125 hole in it that can be used to calibrate appropriately sized RTDs as well as thermistors and thermocouples Access to the well is through a 6 3 mm 0 25 hole near the center of the right side panel Please observe the following points when cali brating RTDs and other probes e The IR target plate must first reach the desired temperature and be stable The green ready LED lights up when the IR target plate is ready for cali 21 9135 Infrared Thermometer Calibrator User s Guide 22 bration DO NOT attempt to calibrate thermometers unless the green ready LED is lit otherwise accuracy may be compromised The 9135 s test well is intended for 3 18 mm 0 125 diameter probes only DO NOT attempt to force probes larger than this size or bent probes into the well For good accuracy the probe must be inserted the fu
6. LTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re CAT I fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances The European Waste Electrical and Electronic Equipment WEEE Directive C TIC Australian EMC Mark ER 2002 96 EC mark 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired The following definitions apply to the terms Warning and Caution e Warning identifies conditions and actions that may pose hazards to the user e Caution identifies conditions and actions that may damage the instru ment being used 1 2 1 A Warnings To avoid personal injury follow these guidelines e DO NOT operate this unit without a properly grounded properly polar ized power cord e DO NOT connect this unit to a non grounded non polarized outlet e DO NOT use this unit for any application other than calibration work e DO NOT use this unit in environments other than those listed in the user s guide e Completely unattended operation is not recommended for safety rea sons e Always replace the fuse with one of the same rating voltage and type e Ifthe instrument is used in a manner not in accordance with the equi
7. ance The unit should be recalibrated at the factory yearly Never attempt to modify the instrument 25 9135 Infrared Thermometer Calibrator User s Guide 26 A WARNING Never introduce any fluids or other foreign material onto the IR target or into the well block This will damage the calibrator cause loss of accuracy and may cause sticking and damage to your probes In the event that the calibrator should require service or repair please contact a Hart Scientific Authorized Service Center for assistance The user should not attempt to make any repairs or adjustments 11 Troubleshooting CE Comments 11 11 1 11 1 1 11 1 2 Troubleshooting If problems arise while operating the 9135 this section provides some sugges tions that may help you solve the problem If after considering the following suggestions the problem still cannot be resolved call an Authorized Service Center for assistance Opening the unit without contacting an Authorized Ser vice Center may void the warranty Problem Causes and Solutions Incorrect temperature reading Check that the green ready LED is lit showing that the IR target has stabilized to the set point Check that the IR thermometer is close enough to the IR target Check that the IR thermometer is set to 0 95 emmisivity Check that the IR target surface is clean and free of particles Check the temperature with a calibrated 3 18 mm 0 125 diameter RTD to verify the tempe
8. e 75kPa 106kPa e mains voltage within 10 of nominal e vibrations in the calibration environment should be minimized e altitude less than 2 000 meters 9135 Infrared Thermometer Calibrator User s Guide 3 3 Warranty Fluke Corporation Hart Scientific Division Hart warrants this product to be free from defects in material and workmanship under normal use and service for a period as stated in our current product catalog from the date of shipment This warranty extends only to the original purchaser and shall not apply to any product which in Hart s sole opinion has been subject to misuse alteration abuse or abnormal conditions of operation or handling To exercise this warranty the purchaser must forward the product after calling or writing a Hart Scientific Authorized Service Center see Section 1 3 for au thorization The Service Centers assume NO risk for in transit damage THE FOREGOING WARRANTY IS PURCHASER S SOLE AND EXCLU SIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EX PRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR USE HART SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAM AGES OR LOSS WHETHER IN CONTRACT TORT OR OTHERWISE 4 Quick Start Unpacking 4 1 4 2 4 3 Quick Start Unpacking Unpack the calibrator carefully and inspect it for any damage that may have oc curred du
9. e switches must be set properly Again operating this instru ment with the wrong supply voltage or switch settings will likely damage the instrument and has the potential to start a fire e Always unplug the instrument before changing the voltage settings Changing the voltage switches with power applied will likely damage the instrument and has the potential to start a fire Use a small slotted type screwdriver or equivalent instrument to change the switches 11 9135 Infrared Thermometer Calibrator User s Guide The mains supply must be reasonably stable and free from surges dropouts and interference that can affect the temperature stability of the IR target 12 5 Parts and Controls Back Panel 5 1 5 2 Parts and Controls The user should become familiar with the 9135 calibrator and its parts Refer to Figures 1 and 2 as you read the following sections Back Panel Power Cord The power cord attaches to the back of the instrument It plugs into a standard 115 VAC optional 230 VAC grounded socket Power Switch The power switch is located on the back panel of the calibra tor The switch is either on or off The on position is for normal operation The off position disconnects power to the entire unit Bottom Prop The prop is located on the bottom of the 9135 and lays flat against the bottom of the calibrator when not in use It can be swung down to incline the instrument Supply Voltage Switches Th
10. ect the ability to calibrate the instrument in the future DO NOT attempt to insert fluid grease or any objects other than clean thermometers into the well DO NOT use fluid to clean out the well e The calibrator should be handled with care Avoid knocking bumping or dropping the calibrator Due to the size and portability of the 9135 it is vulnerable to being shocked and dropped as it is carried around It might be inadvertently dragged off a table top while in use This can cause per manent damage to the instrument and loss of accuracy e Ifa hazardous material is spilt on or inside the equipment the user is re sponsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material e If the mains supply cord becomes damaged replace it immediately e Before using any cleaning or decontamination method except those rec ommended by Hart users should check with a Hart Scientific Authorized Service Center to be sure that the proposed method will not damage the instrument e If the instrument is used in a manner not in accordance with the equip ment design the operation of the dry well may be impaired or safety haz ards may arise e The 9135 calibrator is calibrated at the factory for optimum performance Field adjustment to the instrument should not be attempted If the unit is suspected to be out of calibration or in need of repair please contact the factory for assist
11. ese switches are set to 115V or 230V depending on the supply voltage Section 4 3 Top Panel The top panel is illustrated in Figure 1 IR Target The large hole in the top panel gives access to the IR target The IR target is a metal plate that is coated with a special paint with an emmisivity of 0 95 The IR target is controlled at the selected set point Set point Select The button on the top panel is used to select one of the three set points Pressing the button selects the next set point in the order 50 C 100 C 150 C then back to 50 C The LED corresponding to the selected set point will light Set point Indicators The three yellow LEDs on the top panel correspond to the three set points When the power is on one LED will glow indicating which set point is currently selected Target Ready Indicator The green LED shows when the temperature of the IR target is reached and is stable Immediately after the power is switched on or a new set point is selected the ready indicator will be dark It will light up when the temperature has stabilized at the set point This indicates the instrument is now ready to be used for calibration 13 9135 Infrared Thermometer Calibrator User s Guide 14 5 4 Power Switch Power Cord Socket 9135 INFRARED CALIBRATOR Hart Scientific IR Target Target Ready Indicator TARGET READY Set point Indicators Set point Select SET POINT SELECT Figure 1 Top Panel Right S
12. has the potential to start a fire Turn on the power to the calibrator by toggling the power switch on The yel low LED corresponding to the 50 C set point should immediately illuminate and the calibrator will begin heating to this set point If the unit fails to operate please check the power connection The green ready LED should initially be dark until the IR target reaches the set point Setting the Temperature As soon as the 9135 calibrator is switched on the 50 C set point LED lights and the instrument begins to heat to 50 C If this set point is desired wait until the temperature stabilizes To select the 100 C set point press the select button once and observe the 100 C set point LED light up To select the 150 C set point press the select button once more and observe the 150 C set point LED light up To set the set point back to 50 C press the select button once or twice until the 50 C set point LED lights up Any time the select button is pressed the green ready LED will go dark and stay dark until the temperature reaches the new set point After the set point is selected it will take some time for the instrument to heat or cool to the desired temperature Wait for the green ready indicator to light up before proceeding with any calibrations Target Ready Indicator The green target ready indicator shows when the IR target has stabilized to the set point Immediately after the power is switched on and any time the select but
13. ide Panel The right side panel is illustrated in Figure 2 Test Well The right side panel has a 6 3 mm 0 25 hole near its center that allows access to a 3 18 mm 0 125 test well in the IR target plate The test well accepts 3 18 mm 0 125 RTDs thermistor probes or thermocouples for calibration see Section 8 2 The test well is also used to calibrate the 9135 against a standard RTD see Section 9 Calibration Access Hole There is a small oblong hole on the right side panel These gives access to two potentiometers used to calibrate the 9135 DO NOT 5 Parts and Controls Right Side Panel adjust these potentiometers unless qualified to do so as part of a regular mainte nance and calibration schedule see Section 9 Calibration Access Hole Test Well Prop Figure 2 Right Side Panel 15 6 General Operation Set up 6 1 6 2 6 3 General Operation This section explains basic operation of the 9135 calibrator Set up Place the calibrator on a flat surface with at least three inches of free space around the instrument The prop may be swung down to tilt the instrument from a horizontal position Plug the power cord into a grounded mains outlet Make sure the supply voltage and voltage switch settings are correct see Sec tion 4 3 The supply voltage must always match the switch settings Operating this instrument with the wrong supply voltage or switch settings will likely damage the instrument and
14. ll depth of the well and not fit too loosely DO NOT attempt to calibrate thermom eters that are too short or too loose otherwise accuracy may be compro mised The test well must be kept clean and dry Dirt oil or objects stuck in the well can affect the safety and operation of the 9135 and especially affect the ability to calibrate the instrument in the future DO NOT attempt to insert fluid grease or any objects other than clean thermometers into the well Inserting a probe into the test well may temporarily disturb the tempera ture of the target plate For best results wait at least three minutes after in serting the probe before continuing with the calibration Remember that the IR target gets hot Be careful not to touch the IR target or let any object other than the probe being calibrated to come into contact with it Probes removed from the test well can be hot and remain so for several minutes After removing a probe place it on a safe heat re sistant surface or holder until it cools down 9 Calibration Procedure Calibration Procedure The 9135 should be calibrated regularly to ensure accuracy A one year or less calibration interval is recommended Calibration should only be performed by a qualified and authorized technician The calibration of the 9135 entails adjusting the calibration potentiometers in side the instrument until the temperature of the IR target is close to the set point temperature as observed with
15. more than 0 5 C but less than 1 C then adjust the potentiometer on the right one half turn at a time waiting one to two minutes between adjustments until the standard RTD or thermistor shows the temperature is close to 100 C within 0 25 to 0 5 C Do not force the temperature to exactly 100 C or the error at the other two set points will be excessive If the temperature differs from 100 C by more than 1 C then the instrument may require factory service 8 Check the temperature once more at each of the three set points 23 10 Maintenance 10 Maintenance e This calibration instrument has been designed for a minimum of required maintenance as long as it is handled with proper care Please regard the following e Avoid operating the instrument in an oily wet dirty or dusty environ ment If the outside of the instrument becomes soiled it may be wiped clean with a damp cloth and mild detergent DO NOT use harsh chemi cals on the surface which may damage the paint e Itis very important to keep the IR target clean Avoid allowing any ob jects to contact the surface of the IR target that may contaminate or scratch it DO NOT use fluid to clean the IR target Dust can be blown off with clean air When not in use it is advisable to store the calibrator in a clean covered container e The test well must be kept clean and dry Dirt oil or objects stuck in the well can affect the safety and operation of the 9135 and especially aff
16. ne whether temperature stability has been achieved or not and switches the ready LED on or off accordingly 19 8 Thermometer Calibration IR Thermometer Calibration 8 1 8 2 Thermometer Calibration The 9135 calibrator was designed primarily for calibrating infrared thermome ters However it can also be used to calibrate certain types of RTDs The fol lowing sections explain the calibration of IR thermometers and RTDs respectively IR Thermometer Calibration Infrared thermometers are calibrated by pointing them at the 9135 s IR target and comparing their readings to the known temperature of the target In order to achieve accurate measurements several important conditions must be observed e The IR target must first reach the desired temperature and be stable The green ready LED lights up when the IR target is ready for calibration DO NOT attempt to calibrate thermometers unless the green ready LED is lit otherwise accuracy may be compromised e The 9135 s IR target is specially coated for an emmisivity of 0 95 The 9135 should only be used to calibrate IR thermometers that are set for this value of emmisivity DO NOT attempt to calibrate thermometers unless they are set for 0 95 emmisivity otherwise accuracy may be compro mised e When calibrating IR thermometers the thermometer must see only the IR target of the 9135 The thermometer must be pointed directly at the tar get at approximately a 90 angle and
17. nt temperature and is stable The 9135 calibrator was designed for portability low cost speed and ease of operation 3 Specifications and Environmental Conditions Specifications 3 1 Specifications and Environmental Conditions Specifications Set points 50 C 122 F 100 C 212 F and 150 C 302 F Accuracy 1 0 C Stability 2 sigma 0 1 C 0 18 F Target Emmisivity 0 95 Target Area 1 5 in 38 mm diameter Test Well Size 0 125 in 3 18 mm diameter Heating Time 25 to 150 C 3 minutes typical Stabilization Time 3 minutes typical Cooling Time 150 to 50 C 25 minutes typical Power 115 VAC 10 1 0 A or 230 VAC 10 0 5 A 50 60 Hz 125 W Size 1 8 46 mm H x 4 4 112 mm W x 7 8 198 mm D Weight 1 5 Ib 0 7 kg Safety OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per 1EC1010 1 Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation 1t must be handled with care The instrument should not be operated in an excessively dusty or dirty environment Maintenance and clean ing recommendations can be found in the Maintenance section of this manual The instrument operates safely under the following conditions e temperature range 5 40 C 41 104 F e ambient relative humidity maximum 80 for temperature lt 31 C de creasing linearly to 50 at 40 C e pressur
18. one 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl Fluke Int l Corporation Service Center Instrimpex Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 512 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 1 Before You Start Authorized Service Centers Telefax 65 6799 5588 E mail antngOsinga fluke com When contacting these Service Centers for support please have the following information available e Model Number e Serial Number e Voltage e Complete description of the problem 2 Introduction Introduction Hart Scientific s Model 9135 Infrared Thermometer Calibrator is a small por table instrument designed for quick on site checks and calibration of infrared thermometers It features an aluminum temperature controlled plate coated with special 0 95 emmisivity paint A precision proportional integral tempera ture controller maintains the temperature of the plate The set point can be con veniently selected by the one button control to 50 C 100 C or 150 C One of three yellow LEDs corresponding to the three set points glows to indicate which set point is selected A green LED turns on when the temperature of the plate reaches the set poi
19. p ment design the operation of the calibrator may be impaired or safety hazards may arise e Follow all safety guidelines listed in the user s manual e DO NOT operate near flammable materials e DO NOT use fluids to clean the plate 1 Before You Start Authorized Service Centers 1 2 2 1 3 The instrument can generate high temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be very hot when removed from the instrument Cautiously handle probes to pre vent personal injury Carefully place probes on a heat resistant surface or rack until they are at room temperature Never place any objects other than the probe to be calibrated into the plate Calibration Equipment should only be used by Trained Personnel Cautions To avoid possible damage to the instrument follow these guidelines Never introduce fluids or any foreign material onto the IR target or into the well block DO NOT change the values of the calibration constants from the factory set values The correct setting of these parameters is important to the safety and proper operation of the calibrator ONLY OPERATE this unit with proper supply voltage and frequency Make sure both of the voltage switches are set properly Operating this in strument with the wrong supply voltage or switch settings can damage the instrument and has the potential to start a fire Operate the instrument in room temperatures between 5 40
20. rature of the IR target Have the instrument calibrated regularly None of the LEDs light Check that the power cord is plugged in and the power switch is on Check that the mains supply is the correct voltage as indicated on the back of the calibrator The internal fuse may be blown or the calibrator may be damaged in which case the instrument should be returned Contact a Hart Scien tific Authorized Service Center for assistance The ready indicator stays dark Even under normal circumstances it can take up to ten minutes to heat up to and stabilize at a higher temperature and up to 40 minutes to cool down to and stabilize at a lower temperature Check that the mains supply is the correct voltage as indicated on the back of the calibrator Make sure the mains supply is reasonably free from surges drop outs and interference CE Comments EMC Directive Hart Scientific s equipment has been tested to meet the European Electromag netic Compatibility Directive EMC Directive 89 336 EEC The Declaration of Conformity for your instrument lists the specific standards to which the unit was tested Low Voltage Directive Safety In order to comply with the European Low Voltage Directive 73 23 EEC Hart Scientific equipment has been designed to meet the IEC 1010 1 EN 61010 1 and IEC 1010 2 010 EN 61010 2 010 standards 27
21. ring shipment If there is shipping damage notify the carrier immedi ately Verify that the following components are present e 9135 Calibrator e Manual e Report of Calibration e Calibration Label Set up Place the calibrator on a flat surface with at least three inches of free space around the instrument The prop may be swung down to tilt the instrument from a horizontal position Plug the power cord into a grounded mains outlet of the proper voltage see Section 4 3 Observe that the nominal voltage corre sponds to that indicated on the back of the calibrator Turn on the power to the calibrator by toggling the power switch on The yel low LED corresponding to the 50 C set point should immediately illuminate and the calibrator should begin heating to 50 C If the unit fails to operate please check the power connection Power The calibrator is configured for either 115 VAC 10 50 60 Hz or 230 VAC 10 50 60 Hz using switches underneath There are two switches and both must be set to the correct voltage One switch configures the power supply and the other configures the heater The calibrator can be switched in the field for operation at either voltage as long as the following conditions are observed e The supply voltage must always match the switch settings Operating this instrument with the wrong supply voltage or switch settings will likely damage the instrument and has the potential to start a fire e Both voltag
22. ton is pressed to change the set point the green LED will go dark and stay dark until the temperature reaches the new set point After setting the set point it can take up to ten minutes to heat up to and stabilize at a higher temperature and up to 40 minutes to cool down to and to stabilize at a lower temperature When the set point is reached and the temperature becomes stable the green ready LED will light indicating that the target is ready for calibration 17 7 Controller Operation Controller Operation The 9135 calibrator uses a precise analog proportional integral controller that maintains the temperature of the IR target The set point is controlled by a spe cial digital switching circuit that allows one button to advance through the se quence of set points It also contains a power on reset circuit that causes the controller to default to the first set point immediately after the power is switched on The controller senses the temperature of the IR target using a thermistor sensor imbedded in the plate It compares the resistance of the thermistor to preset set point resistances to determine whether the IR target should be heated or cooled and how much power should be applied The con troller uses a solid state relay circuit to apply power in a time proportioned manner to a resistance heater attached to the IR target The ready indicator cir cuit uses the difference signal between the temperature sensor and the set point to determi
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