Fluke 1502A User's Manual
Contents
1. ES LF 6 General Operation Selecting the Probe Characterization 6 4 6 4 1 6 4 2 when all the digits are correct If the password is entered correctly the first pa rameter in the menu will appear Selecting the Probe Characterization Before the 1502A can measure temperature accurately it must know how to cal culate temperature from the resistance of the sensor You must select a conver sion type and enter the proper characterization coefficients There are several temperature conversion algorithms available The one to use depends on the type of probe you are using and its calibration The conversion algorithms use coefficients that characterize the sensor Coefficients are determined when the probe is calibrated SPRTs and PRTs often use the ITS 90 algorithms and are provided with ITS 90 characterization coefficients Setting the Probe Characterization Type The probe characterization type and characterization coefficients are set in the Probe menu Press the Menu button SE appears then the C Probe but ton The menu name Pr ob E will appear briefly then the characterization type The probe characterization types are indicated on the display as follows Pr 99 ITS 90 AO Pr red Callendar Van Dusen A Pr E68 IPTS 68 Select the desired probe characterization type using the 4 and Y buttons and pressing the Enter button After the characterization type is selected the char acter2. Hart Scientific 9 1502A Thermometer Readout User s Guide Rev 722101 ENG Rev 722101 Limited Warranty amp Limitation of Liability Each product from Fluke Corporation Hart Scientific Division Hart is warranted to be free from de fects in material and workmanship under normal use and service The warranty period is three years for the Thermometer Readout The warranty period begins on the date of the shipment Parts product re pairs and services are warranted for 90 days The warranty extends only to the original buyer or end user customer of a Hart authorized reseller and does not apply to fuses disposable batteries or to any other product which in Hart s opinion has been misused altered neglected or damaged by accident or abnor mal conditions of operation or handling Hart warrants that software will operate substantially in accor dance with its functional specifications for 90 days and that it has been properly recorded on non defective media Hart does not warrant that software will be error free or operate without interrup tion Hart does not warrant calibrations on the Thermometer Readout Hart authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Hart Warranty support is available if product is purchased through a Hart authorized sales outlet or Buyer has paid the applicable internationa
3. or c for the ITS 90 characterization n is 6 or 7 D6 lt value gt lt EOS gt sets d for the ITS 90 characterization SC 69 lt EOS gt or SC 90 lt EOS gt sets the temperature scale for the IPTS 68 characterization Testing the Characterization The following command can be used to test the probe characterization CO lt value gt lt EOS gt returns a temperature calculated from resistance The 1502A will respond with a temperature value computed from the given re sistance value The temperature is given in the currently selected unit As an ex ample if the Callendar Van Dusen characterization is selected with IEC 751 coefficients and the selected unit is Celsius sending this command with a resis tance value of 138 5 will return a temperature value of 100 0 C Sample Commands The following commands ralate to the measurement process 7 Digital Communications Interface Remote Commands 7 3 3 1 7 3 3 2 7 3 3 3 7 3 4 7 3 4 1 7 3 4 2 Setting the Filter The filter helps to reduce variations in the measurements The filter can be set remotely using the command Fl lt value gt lt EOS gt sets the filter time constant FI 0 lt EOS gt disables the filter The value is the filter time constant in seconds It must be between 0 and 60 in clusive A value of O disables the filter Setting the Probe Current The probe excitation current can be set remotely using the commands CU 1 lt EOS gt sets the current
4. All menus can be locked out to prevent inadvertently changing parameters By default only the Cal menu is locked out The lockout option is accessed in the Cal menu see Section 8 1 Accessing the Calibration Parameters If menus are locked out you must enter the correct password 2051 to gain access After you select the menu see the previous section the display will show PA 0000 and allow you to change the number to the correct pass word Use the lt and buttons to move between the password digits and the 4 and Y buttons to increase or decrease the value of a digit Press Enter 15 1502A Thermometer Readout User s Guide CR C3 Set probe type Set filter Set coefficients Set current E furs 10 Set power saver Test conversion 100 0000 Press O after changing a parameter briefly to skip a parameter to exit the menu Figure 4 Parameter Menu Structure Set clock 11 23 30 Enter password PA 0000 Set time stamp ES OFF Set menu lockout LO CAL Set baud rate e400 b Set CALO 0 0006 Set sample period 00 00 01 Set CAL 100 10 0128 Set duplex duP FUL i Set CAL 400 Set linefeed LF ON Factory reset rESEEP Set GPIB address Add ee Set GPIB EOS
5. Error Message at Power Up The 1502A reports an error during the power up self test On power up the 1502A performs a self test of several of its key components A failure of a component will cause an error message to be displayed such as Err 4 The possible error messages and their meanings are as follows Err 1Static RAM failure Err 2Nonvolatile RAM failure Err 3Internal data structure error Err 4ADC initialization failure Err 5ADC operation error Generally each of these conditions require a qualified factory technician to re place a faulty component Contact the factory for assistance One possible ex ception might be if a large static discharge nearby disturbs the circuits Cycling the power off and back on again may allow the 1502A to resume normal opera tion Another might be if the AC source voltage is incorrect e g using 115 V when the 1502A is configured for 230 V Check the source voltage and the 1502A s configuration and make sure they agree CE Comments EMC Directive Fluke Corporation Hart Scientific Division s equipment has been tested to meet the European Electromagnetic Compatibility Directive EMC Directive 89 336 EEC The Declaration of Conformity for your instrument lists the spe cific standards to which the unit was tested The instrument was designed specifically as a test and measuring device Com pliance to the EMC directive is through IEC 61326 1 Electrical equipment for measurement con
6. INDIRECT INCIDENTAL OR CONSE QUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA WHETHER ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT TORT RELIANCE OR ANY OTHER THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court of com petent jurisdiction such holding will not affect the validity or enforceability of any other provision 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 Copyright O 2005 Printed in USA Table of Contents 1 Before You Start l 1 1 Symbols Used cas eee a eR 1 1 2 Safety Information 2 2 0 0 000000 eee 2 1 2 1 WarnitgS 2 6 a a a le o e 2 1 2 2 CAUONS sii a dde eh da de te eee eee Be 3 1 3 Authorized Service Centers s ascos acea iia s na e e 4 2 Introduction 7 3 Specifications and Environmental Conditions 9 3 1 SPEcITICAION S asos eack er e A 9 3 2 Environmental Conditions 10 4 Quick Start oc sn 4 de Sk ee Be ee a 8 oe Soe M 4
7. and then the Comm menu button Press Exit to skip 7 Digital Communications Interface GPIB Interface 7 2 to the time stamp parameter The display will briefly show t 5t A then the time stamp state which is either ON or OFF Use the 4 and Y buttons to change the state and press Enter ON enables transmission of the time stamp and OFF disables it The time stamp can also be set using the ST communications command The command ST ON lt EOS gt enables the time stamp and ST OF lt EOS gt disables it The clock and time stamp parameters affect the time stamp of data read through both the RS 232 and IEEE 488 interfaces Duplex Mode and Linefeed Commands sent to the 1502A through the RS 232 interface are normally ech oed back to the remote device To disable this feature set the duplex option to half instead of full The duplex parameter is found in the Comm menu after the sample period parameter The display will briefly indicate g U P L and then display the current duplex setting Use the 4 and Y buttons to set duplex to HALF or FULL then press Enter Duplex can also be set using the D 1 communications command The com mand DU H lt EOS gt sets duplex to half and DU F lt EOS gt sets duplex to full Transmissions from the 1502A through the RS 232 interface are normally fol lowed by a linefeed character ASCII decimal 10 The linefeed character can be disabled by setting the linefeed LF
8. o for ohms Simply press the appropriate unit button C F K or Q to select the units Parameter Menus Except for unit selection all functions and operating parameters are accessed and edited within the parameter menus There are four menus the Probe pa rameter menu Sample parameter menu Comm communication parameter menu and Cal calibration parameter menu The arrangement of parameters in the menus is shown in Figure 4 on page 16 Menus are selected by pressing the Menu Enter button followed by the appro priate menu selection button The name of the menu will briefly appear on the display For example the Probe menu is selected by pressing the Menu Enter button SEE appears on the display followed by the C Probe button Pr obE appears Selecting the Cal menu requires that you press the Menu Enter button then press the Q Exit button and hold it down for at least one second The Probe menu contains parameters for selecting the probe characterization and setting the characterization coefficients These parameters are explained in Section6 4 The Sample menu contains parameters for setting the filter and ex citation current These are explained in Sections 6 5 and 6 6 The Comm menu contains communication parameters such as the serial baud rate or IEEE 488 address These are explained in Sections 7 1 and 7 2 The Cal menu contains the calibration parameters These are explained in Section 8 1 Menu Lockout
9. or set the 0Q calibration parameter C1 lt value gt read or set the 1002 calibration parameter C4 lt value gt read or set the 400Q calibration parameter SN lt value gt read or set the instrument serial number Miscellaneous Commands VER read model number and firmware version number IDN read manufacturer model number serial number and firmware version number SCPI compatible H read a list of commands 7 3 1 1 Reading Temperature The most recent temperature measurement can be read using the following command T lt EOS gt reads the most recent measurement The syntax of the response is as follows t _nnnn nnn_u or t _nnnn nnn_u_hh mm ss The _ s represent space characters The n s represent the digits of the measure ment value If fewer digits are needed the leading positions are filled with space characters The u represents the unit which is either C F K or O for ohms The time stamp appears if this option is enabled see Section 7 3 1 4 be low The time appears in 24 hour format with two digits each for hours min utes and seconds The following SCPI compatible command can also be used to return the most recent measurement but without the label and unit FETC lt EOS gt or FETCH lt EOS gt returns the value of the most recent measurement 7 Digital Communications Interface Remote Commands 7 3 1 2 7 3 1 3 7 3 1 4 7 3 1 5 7 3 2 Automatica
10. 7 3 6 1 32 LF OF lt EOS gt disables linefeed Calibration Commands The following commands are used in calibrating the instrument Entering the Password In order to set the calibration parameters the password must be issued first The following command enables access to the calibration parameters PA 2051 lt EOS gt enables the calibration commands Calibration parameters can be locked out again by sending PA 0 or by cycling the power Setting the Menu Lockout The following commands can be used to select the menu lockout options LO CA lt EOS gt locks out only the calibration menu LO AL lt EOS gt locks out all menus Setting the Calibration Coefficients The instrument calibration coefficients are used to maintain the resistance mea surement accuracy of the 1502A These coefficients must not be changed ex cept by a qualified technician during the calibration of the 1502A The following commands can be used to set the instrument calibration coefficients C0 lt value gt lt EOS gt sets the calibration parameter CALO C1 lt value gt lt EOS gt sets the calibration parameter CAL100 C4 lt value gt lt EOS gt sets the calibration parameter CAL400 Setting the Serial Number The following command is used to set the serial number of the 1502A SN lt value gt lt EOS gt sets the instrument s serial number Other Commands Remaining commands are described below Instrument Identification The following c
11. 8 CTS 8DCD rate then press Enter The next NE nT parameter in the Comm menu the serial sample period will then appear Figure 5 Serial Cable Wiring 23 1502A Thermometer Readout User s Guide 24 7 1 2 Automatic Transmission of Measurements The 1502A can be programmed to automatically send measurements to a re mote printer or terminal The transmission interval is set using the SA PEr sample period parameter This is set in the Comm menu after the baud rate pa rameter The display will briefly indicate SA PEr and then display the cur rent sample period The sample period is specified in hours minutes and seconds Setting the sample period to 0 disables automatic transmission of mea surements Use the lt and amp buttons to move between digits The selected digit will flash Use the 4 and Y buttons to increase or decrease the digit When the sample period is set as desired press Enter The sample period can also be set using the SA communications command The period can be specified in seconds in minutes and seconds or in hours minutes and seconds For example SA 15 lt EOS gt causes the 1502A to trans mit measurements at 15 second intervals SA 10 00 lt EOS gt causes the 1502A to transmit a measurement every ten minutes SA 2 00 00 lt EOS gt causes the 1502A to transmit a measurement every two hours lt EOS gt represents the ter mination character which is either a linefeed or ca
12. or set for the Callendar Van Dusen or IPTS 68 characterization DE lt value gt read or set 5 for the Callendar Van Dusen or IPTS 68 characterization BE lt value gt red or set f for the Callendar Van Dusen characterization A4 lt value gt read or set a for the ITS 90 or IPTS 68 characterization B4 lt value gt read or set b for the ITS 90 characterization C4 lt value gt read or set c for the IPTS 68 characterization An lt value gt read or set a5 a dy Ay Ayg Or a for the ITS 90 characterization Br lt value gt read or set b b bs or by for the ITS 90 characterization Cn lt value gt read or set c or c for the ITS 90 characterization D6 lt value gt read or set d for the ITS 90 characterization SC 68 90 read or set IPTS 68 scale conversion CO lt value gt test resistance to temperature conversion Sample Parameter Commands Fl lt value gt read or set filter time constant CU lt value gt read or set probe current PS lt value read or set the power saver period Communication parameter commands DU F H read or set serial sample duplex mode LF ON OF read or set serial linefeed 27 1502A Thermometer Readout User s Guide Command List Continued 28 Command Description Calibration Commands PA lt password gt disable password lockout of calibration commands LO CAIAL read or set menu lockout C0 lt value gt read
13. parameter to 0 F F The linefeed pa rameter is found in the Comm menu after the duplex parameter The display will briefly indicate L F and then display the current linefeed setting Use the and Y buttons to set linefeed 8 n or OFF then press Enter The linefeed can also be set using the LF communications command The command LF OF lt EOS gt disables the linefeed character and LF ON lt EOS gt enables it GPIB Interface The 1502A is available with an optional IEEE 488 GPIB port The IEEE 488 interface is useful when one computer needs to control and collect data from many instruments simultaneously The IEEE 488 connector is located on the back panel of the 1502A above the RS 232 connector To eliminate noise the GPIB cable should be shielded The 1502A is equipped with basic communication capabilities as specified in TEEE 488 1 The particular capabilities of the IEEE 488 interface are AHI SH 1 T6 L4 DC1 TEO LEO SRO RLO PPO DTO Refer to IEEE Std 488 1 1987 The 1502A can talk and listen and accepts the DCL and SDC clear commands The 1502A does not respond to trigger GET serial poll parallel poll or remote local commands and is not capable of talk only mode 25 1502A Thermometer Readout User s Guide 26 7 2 1 7 2 2 7 2 3 7 3 7 3 1 Setting the Address The IEEE 488 bus requires that each device has a unique address The default address of the 1502A is 22 but
14. the band buttons to change the value for the current Press Enter to continue Power Saver The power saver feature causes the display to blank after a period of no user ac tivity The power saver feature can reduce operating current by as much as 100 mA While the display is blanked a small illuminated dot appears on the left side of the display as an indication that the 1502A is still operating Pressing any button on the front panel restores the display You can program the power saver to activate after a specified period of time from 5 minutes to 60 minutes in intervals of 5 minutes You can also disable the power saver feature com pletely The power saver is off by default The power saver is programmed in the Sample menu Press the Menu button SEE FP appears then press the Sample menu button Press Exit twice to skip to the power saver parameter The display will briefly show P0 5A followed by the power saver setting You can use the 4 and Y buttons to change the power saver period in minutes or set it to OFF Press Enter to continue 7 Digital Communications Interface Serial Interface 7 1 Digital Communications Interface Remote communications allows an external device such as a computer to com municate with the 1502A to obtain measurement data and control its operation Communication is accomplished with various commands issued to the 1502A through the RS 232 port or optional IEEE 488 port A full list of com
15. 00 and CAL400 The CALO parameter sets the correction at OQ resistance but does not affect the correction at 1000 The CAL100 parameter sets the correction at 100Q resistance but does not affect the correction at 002 The CAL400 parameter sets the correction at 4004 resistance but does not affect the correction at 0 and 1004 Adjusting the calibration param eters directly affects the measurement at the specific resistances For example increasing the CAL100 parameter by 0 005 increases the measured value at 100 by 0 005 Accessing the Calibration Parameters The calibration parameters are accessed in the Cal menu The calibration pa rameters are protected by requiring the correct password to access them Press the Menu button S t 2 appears Press the Q Exit button and hold it down for one second CAL appears briefly The display will show PA 8000 and allow you to change the number to the correct password You must enter the password 2051 Use the and amp buttons to move between the password digits and the and Y buttons to increase or decrease the value of a digit Press Enter when all the digits are correct If the password is entered correctly the first parameter in the calibration menu will appear The first parameter in the Cal menu is the lockout control parameter indicated on the display as L L 0UE This parameter has two options CAL and ALL CAL default locks out the cali
16. 02A to perform certain actions Ta ble 6 provides a complete list of commands These commands can be used with either the RS 232 or IEEE 488 interface All commands sent to the 1502A must be terminated with a carriage return or linefeed Either upper or lower case letters are accepted Commands used to set a parameter are issued with the command header an character and the parameter value For example U C lt EOS gt sets the units to Celsius The symbol lt EOS gt represents the termi nation character Commands used to request data are issued with only the command header For example T lt EOS gt causes the 1502A to return the most recent measurement Basic operations using commands are explained in the fol lowing sub sections Measurement Commands The following commands relate to reading measurement data 7 Digital Communications Interface Remote Commands Table 6 Command List Command Description Measurement Commands T read measurement includes label unit and time F ETCH read measurement value SCPI compatible SA hh mm ss read or set serial sample period U CIFIKIO select units ST ON OF read or set the time stamp CL hh mm ss read or set the system clock Probe Characterization Commands PR 90168IRIS read or select the characterization type RO lt value gt read or set RO or R 0 01 C depending on the selected characterization AL lt value gt read
17. 1 Unpacking o o coud 864 24 L244 Gab Oe SSG EE a 11 4 2 POWCE s ae Sea Be a Se ee a e as 11 4 3 Connecting the Probe oetans ee 11 5 Parts and Controls 13 5 1 Front Panel Buttons 40 00 es e 13 5 2 Rear Pan l ou rr pad e eS 14 6 General Operation o o o 15 6 1 Selecting Units 2 2 20 20 2002 00000004 15 6 2 Parameter Menus 2 2 4 2 ate Ae a ek BOR Re a 15 6 3 Menu Lockout voor ea Ha RE Oe ee a es 15 6 4 Selecting the Probe Characterization 17 6 4 1 Setting the Probe Characterization Type o o oo o oo oo 17 6 4 2 Setting the Characterization Coefficients o o 17 6 4 3 ITS 90 PRT and Coefficients o ee e e 18 6 4 4 Callendar Van Dusen RTD Conversion o osoo 20 6 4 5 IPT S 68 Conversions aooe e dees ed e aa a a 21 6 4 5 1 Setting the Characterization Coefficients 0 2 ee ee 21 6 4 5 2 Testing the Cogflici nts 000 ce hare ae eek e hg cde ee Be aay Bes hk 21 6 5 Filtering eaa es oe ee ee ee Gl bo ee eRe ee SS 22 6 6 Setting the Current o o 22 6 7 Power Sayers scg ecw cu E a AE HO 22 7 Digital Communications Interface 23 7 1 Serial Interface es sa SSG ar e 23 7 1 1 Setting the Baud Rates 0 oe aa was et e e ELEGY ds 23 FA2 Automatic Transmission of Measurements 2000 24 7 1 3 Time Stamp and System Clock 2
18. 2 2 ooo ooo 24 7 1 4 Duplex Mode and Linefeed ess dee idea 25 Ta GPIB Interface ss sa vite hehe ca ws Boe eee Se ew as a 25 7 2 1 Setting the Address e aa aa a a a A 26 Tad Setting the Termination Character 2 ees 26 7 2 3 Time Stamp errer eA ee Pha eR RE Pee He eee Oe wh bas 26 TO Remote Commands e 26 73 1 Measurement Commands s a v seese i ea e a eE a eee eee 26 Ta Reading Temper tlte ho iso ra a A ea ea E 28 7 3 1 2 Automatically Transmitting Measurements o ooo o 29 7 3 1 3 Selecting the Unit of Measurement me sis Eae nok tia aa a 00000084 29 73 14 Enabling the Time Stamp aosa s ac coe oe Ges wo WA SS a jara Bela A a 29 TAD Setting the Clock simi a seed OR Ne Re ee at ae ge en 29 7 3 2 Probe Characterization Commands 00000 0000 29 7 3 2 Selecting the Characterization o pos eai aa dos aw Fe Fe Se ee 30 7322 Testing the Charact rization eo in gh eho ages dope are da do Sete we a 30 7 33 Sample Commands sis i ego goad gk a SOR Ae A Bw Ge ETR A Boe E 30 733 Setting the Filter ooo gs dc aoe ge aw Gee eS ce ES ee Sw 31 73 32 Setting the Probe Current od SO Bw a ae BR BO Ee 31 1 3 3 3 Setting the Power Saver s 022 g 4 a0 a wee ek RR ER RLY BO Ree a 31 7 3 4 Communication CommMands 0 000000 eee eee 31 7 3 4 Setting the Duplex Modes oe 5 the de Bk rie oa e eM Rap Bok Gas 31 7342 Setting the Linefeed Option cs cane ee Rha yadi a A 31
19. 73D Calibration Commands iia ee ee ee ee See E 32 7 3 5 Entering the Password 0 2005 25 Aa eae ee A A 32 73 32 Setting the Menu Lockout socios aaa a a A 32 7 3 5 3 Setting the Calibration Coefficients o oo e e 32 7354 Setting the seid Number sss ds o o Sp Se 32 7 3 6 Other Commands sca dd ca a cd A ra 32 7 3 6 Instrument Identification ocio o se a eR ee we GR eS 32 73 62 Reading a List of Commands o ss ceea eee doe eee cee awh Gas Sete Wee gars 33 8 Calibration Procedure 35 8 1 Accessing the Calibration Parameters 0 35 8 2 Calibration Procedure 0 00000 ee eee 36 9 Maintenance 37 10 Troubleshooting lt 6s8 05 99 10 1 CE Comments lt ca es 444 48 2405806 Oe eA Ga A 40 10 1 1 EMC Directive ida ay acct as cde dosed dee Reed Ae Rees AA 40 10 1 1 1 Immunity Testing 2 4 6 5 seca a 41 IOLI Emission Testing dra doce Be a BOL Werke ide ag E Al 10 1 2 Low Voltage Directive Safety 2 2 20 00 ooo o 41 ij Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Connecting a four wire probe o o 12 1502A Front Panel s3 a spiegami oe eb o6 B ee ew ed 13 1502A Back Panel 2 ee 14 Parameter Menu Structure 16 Serial Cable Wiring 2 ee ee 23 iii Tables Tablel Table 2 Table 3 Table 4 Table 5 Table 6 Table 6 International Electr
20. C type power cord connects to the back of the 1502A The cord must be plugged in to a grounded outlet The power switch is located at the back of the 1502A When the 1502A is powered on wait briefly while it initializes It will then be gin measuring and displaying temperature Because of the quality of the components used in the 1502A it exhibits nearly negligible drift as it warms up The warm up drift is typically less than 5 ppm Nevertheless to ensure the best accuracy and stability you may want to allow the 1502A to warm up for ten minutes before use Accurate measurement requires that the probe be connected properly to the in put and the correct probe characterization set Connecting the Probe The RTD or SPRT probe connects to the back of the 1502A using a five pin DIN plug Figure 1 shows how a four wire probe is wired to the five pin DIN connector One pair of wires attaches to pins and 2 and the other pair attaches 11 1502A Thermometer Readout User s Guide to pins 4 and 5 Pins 1 and 5 source current and pins 2 and 4 sense the poten tial If a shield wire is present it should be connected to pin 3 Probe Connector Shield RTD Sensor Figure 1 Connecting a four wire probe A two wire probe can also be used with the 1502A It is connected by attaching one wire to both pins 1 and 2 of the plug and the other wire to both pins 4 and 5 If a shield wire is present it should be connected to pin 3 Accuracy m
21. Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in an oily wet dirty or dusty environments e If the outside of the instrument becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the surface which may damage the paint or the plastic of the outside shell 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 with a cord with the appropriate gauge wire for the current of the instrument If there are any questions call an Authorized Service Center for more information e Before using any cleaning or decontamination method except those rec ommended by Hart users should check with an Authorized Service Cen ter to be sure that the proposed method will not damage the equipment e If the instrument is used in a manner not in accordance with the equip ment design the operation of the thermometer may be impaired or safety hazards may arise 37 10 Troubleshooting 10 Troubleshooting In case you run into difficulty while operating the 1502A this section provides some suggestions that may help you solve the problem Below are several situa tions that may arise followed by possible causes of the problem and s
22. ay be significantly degraded using a two wire connection because of lead resistance 12 5 Parts and Controls Front Panel Buttons 5 1 Parts and Controls Front Panel Buttons See Figure 2 The front panel buttons are used to select units of measurement access operat ing parameters and alter operating parameters The function of each button is as follows C Probe This button selects units of degrees Celsius In conjunction with the Menu button it selects the probe parameter menu F Sample This button selects units of degrees Fahrenheit In conjunction with the Menu button it selects the sample parameter menu K Comm This button selects units of Kelvin In conjunction with the Menu button it selects the communication parameter menu Q Exit Cal This button selects resistance in ohms While editing a parame ter it cancels the immediate operation and skips to the next parameter If the Exit button is pressed for more than one half second the menu is exited In conjunction with the Menu button it selects the calibration parameter menu Menu Enter This button allows one of the unit menu buttons to select a menu When editing a parameter it accepts the new value and skips to the next operation and When editing a numeric parameter these buttons move between digits The selected digit flashes 4 and When editing a parameter these buttons increase or decrease the value of the parameter or a selecte
23. bration menu only ALL locks out all menus and access to any menu requires the correct password Use the and buttons to select the lockout option and press Enter to continue The instrument calibration parameters follow The calibration parameters appear with the name shown briefly then the value You can change the sign and digits of each parameter Use the and but tons to move between digits and the 4 and 9 buttons to increase or decrease the value of the digit Press Enter to save the new value The last parameter in the Cal menu is the factory reset function This can be used to clear the internal memory and reset all parameters to the defalut values This is intended to be used only at the factory The calibration parameters can also be set using remote commands through the RS 232 or IEEE 488 interface The PA lt password gt lt EOS gt command must be used first using the correct password 2051 to enable access to the cali bration parameters Lockout protection is automatically set by cycling the 35 1502A Thermometer Readout User s Guide 36 8 2 power The CO lt value gt lt EOS gt C1 lt value gt lt EOS gt and C4 lt value gt lt EOS gt commands can be used to set the values of the CALO CAL100 and CAL400 parameters respectively Calibration Procedure Calibration requires four wire 100Q and 400Q resistors of 6 25 ppm uncer tainty and a OQ resistor or short For verification 25Q a
24. buttons to move between digits and the sign The selected digit will flash Use the 4 and Y buttons to change a digit Once the sign and digits are correct press Enter to accept the number If you decide you would like to cancel any changes you have made you may do so by pressing the Q Exit but ton This will immediately skip to the next coefficient Tf the coefficient also requires an exponent it will appear after setting the num ber as follows Increase or decrease the exponent using the p and q buttons Once the exponent 1s correct press Enter to accept it Testing the Coefficients The 1502A provides a convenient method for testing the coefficients you have entered to make sure they have been entered correctly This is done by calculat ing temperature for given resistances and comparing the results with tempera tures listed on the probe s calibration report This conversion test function is located at the end of the Probe menu After setting the coefficients E ESE ap pears briefly followed by the resistance value You can change the resistance by using the and buttons to move between digits and the and Y buttons to change a digit After setting the resistance press Enter The 1502A will cal culate and display the temperature corresponding to the resistance you entered 21 1502A Thermometer Readout User s Guide 22 6 5 6 6 6 7 Compare this temperature with the temperatures listed on the probe calib
25. can be changed if necessary The IEEE 488 ad dress of the 1502A is set within the Comm menu after the serial linefeed pa rameter This menu option will not appear 1f the IEEE 488 interface is not installed Press the Menu button 5Et 2 appears then press the Comm but ton The display will briefly indicate 5E r 1AL then b AU g and then display the current baud rate Press Enter several times until 1E E E appears The dis play will briefly indicate A d d r E 5 5 and then display the current IEEE 488 address Use the 4 and Y buttons to change the number then press Enter Setting the Termination Character The 1502A will normally terminate transmissions from the IEEE 488 port with a linefeed newline character Some systems may require a terminating car riage return instead The termination character can be changed if necessary The termination character is set within the Comm menu after the IEEE 488 address parameter This menu option will not appear if the IEEE 488 interface is not installed The display will briefly indicate EOS end of string and then dis play the current setting Use the 4 and Y buttons to change the termination character then press Enter Time Stamp Measurement data read from the GPIB interface can be stamped with the time of day For instructions on setting the time stamp and system clock see Section 7 1 3 above Remote Commands ASCII commands are used to instruct the 15
26. d digit Cc F a A Hart Scientific THERMOMETER 15024 READOUT PROBE SAMPLE ENTER Figure 2 1502A Front Panel 13 1502A Thermometer Readout User s Guide 14 5 2 Rear Panel See Figure 3 Serial Port The DB 9 connector is for interfacing the thermometer to a com puter or terminal with serial RS 232 communications Probe Connector At the rear of the thermometer is the probe connector The probe must be connected for operation Power Switch The power switch is located on the rear of the thermometer The AC power switch turns the unit on and off AC Power At the rear of the instrument is the removable power cord that plugs into a standard 115 VAC grounded socket 230 VAC optional TEEE 488 Port optional The GPIB connector is for interfacing the ther mometer to a computer or terminal with IEEE 488 communications IEEE 488 FLUKE CORPORATION x HART SCIENTIFIC DIVISION www hartscientific com 1 CE 115 VAC 50 60 Hz 10W SE NO USER SERVICABLE PARTS 201811 Figure 3 1502A Back Panel 6 General Operation Selecting Units 6 1 6 2 6 3 General Operation This section explains basic operation of the 1502A Thermometer Selecting Units Temperature can be displayed in degrees Celsius indicated with degrees Fahrenheit indicated with F or Kelvin indicated with A for absolute The resistance of the sensor can also be displayed indicated with
27. e 100 0 0 00385055 1 49979 and 0 1086 respectively Some probes may be provided with A B and C coefficients for the Callendar Van Dusen equation in the following form R 1 Ar B 120 r i c Jat At BP C t 100 F 1 lt 0 The A B and C coefficients can be converted to a 5 and coefficients using the following formulas 8 a 4 1008 se Y as UE A A 100B ea 100B 6 General Operation Selecting the Probe Characterization 6 4 5 6 4 5 1 6 4 5 2 IPTS 68 Conversion The IPTS 68 characterization converts resistance to temperature according to the International Practical Temperature Scale of 1968 The applicable coeffi cients are Ry r 0 amp ALPHA dELER ay AY and cy 4 You can also select the temperature scale SCALE as IPTS 68 68 or ITS 90 98 Selecting ITS 90 causes the temperature to be adjusted by a small amount equal to the difference between the ITS 90 and IPTS 68 tempera ture scales Setting the Characterization Coefficients Probe characterization coefficients are set within the Probe menu after select ing the probe characterization type Each coefficient appears with its name shown briefly followed by its value For example ATTE RI TAE For some coefficients you only need to set the digits in the number Other coef ficients also have a sign as shown above positive sign appears as Use the and
28. e instrument has not been energized for more than 10 days the instrument needs to be energized for a dry out period of 2 hours before it can be assumed to meet all of the safety requirements of the IEC 1010 1 If the product is wet or has been in a wet environment take necessary measures to remove moisture prior to applying power such as storage in a low humidity temperature chamber operating at 50 C for 4 hours or more Follow all safety guidelines listed in this user s guide Calibration Equipment should only be used by Trained Personnel To avoid possible burn hazards follow these guidelines This instrument can measure extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot or cold Cautiously handle probes to prevent personal injury Carefully place probes on a heat cold resistant surface or rack until they reach room temperature A Cautions To avoid possible damage to the instrument follow these guidelines DO NOT change the values of the calibration constants from the factory set values unless you are recalibrating the instrument The correct setting of these parameters is important to the safety and proper operation of the instrument Allow sufficient air circulation by leaving at least 3 inches of space between the thermometer and nearby objects For CE compliance and for performance use only the AC adapter shipped with the instrument If the AC adapte
29. ical Symbols o oo 1 Matching Certificate Values to 1502A ITS 90 Coefficients 18 Setting Coefficients Rtpw a8 b8 a4 andb4 19 Setting Coefficients Rtpw a5 and b5 04 19 Setting Coefficients R 273 16 a6 b6 c6 andd 20 Command Listesi sica e E aa e RA 27 Command List Continued s s s pa b e i ee e a a 28 1 Before You Start Symbols Used 1 1 Before You Start Symbols Used Table 1 lists the symbols that may be used on the instrument or in this manual Table1 International Electrical Symbols and the meaning of each symbol Symbol Description NU AC Alternating Current ING AC DC Battery Mm Mm Oel eo Complies with European Union Directives DC Direct Current Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off 1502A Thermometer Readout User s Guide 1 2 1 2 1 Symbol Description On E Canadian Standards Association us OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re CATI 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 C TIC Australian EMC mark i The European Waste Electrical and Electronic Equipme
30. ilter Exponential 0 to 60 seconds time constant user selectable Communications RS 232 serial standard IEEE 488 GPIB optional conforms to IEEE 488 1 capability AH1 SH1 T6 L4 DC1 Display 8 digit 7 segment yellow green LED 0 5 inch high characters Clock accuracy typical 0 01 Operating Temperature Range Full accuracy 16 C to 30 C Absolute 0 C to 55 C AC power 115 VAC 10 50 60 Hz 10 W nominal 1 A maximum 230 VAC 10 50 60 Hz 10 W 1 A nominal optional Detachable power cord Size 5 6 inches 14 3 cm wide x 7 1 inches 18 1 cm deep x 2 4 inches 6 1 cm high 1502A Thermometer Readout User s Guide 10 3 2 Weight 2 2 Ib 1 0 kg Safety OVERVOLTAGE Installation CATEGORY Il Pollution Degree 2 per IEC 1010 1 Accuracy specifications apply within the recommended operating temperature range Accuracy limits are increased by a factor of the temperature coefficient outside this range 2Short term accuracy includes nonlinearity and noise uncertainties It does not include drift or calibration uncertainties 3The temperature range may be limited by the sensor Temperature accuracy is for the 1502A only It does not include probe uncertainty or probe characteriza tion errors Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation it must be handled with care The instrument shou
31. ion Service Center Instrimpex Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 5 12 3436 Telefax 86 10 6 5 12 3437 E mail xingye han fluke com cn 1 Before You Start Authorized Service Centers 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 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 The 1502A is a low cost high accuracy digital thermometer readout designed to be used with 25Q and 1004 RTDs and SPRTs Its unique combination of fea tures makes it suitable for a wide variety of applications from laboratory mea surement to industrial processes Features of the 1502A include Measures 25Q and 1000 RTDs and SPRTs Four wire connection eliminates lead resistance effects Accuracy 0 006 C at 0 C Resolution 0 001 C Fast one second measurement cycle Adjustable digital filter Accepts ITS 90 characterization coefficients Also accepts Callendar Van Dusen and IPTS 68 coefficients Adjustable excitation current Displays temperature in Celsius Fahrenheit or Kelvin or displays resis tance in ohms Password protec
32. ization coefficients follow The coefficients that appear depend on the probe type that was selected Setting the Characterization Coefficients Probe characterization coefficients are set within the Probe menu after select ing the probe characterization type Each coefficient appears with the name of a coefficient shown briefly followed by its value For example AE For some coefficients you only need to set the digits in the number Other coef ficients also have a sign as shown above positive sign appears as Use the and amp buttons to move between the digits and the sign The selected 17 1502A Thermometer Readout User s Guide 18 6 4 3 digit will flash Use the 4 and Y buttons to change a digit Once the sign and digits are correct press Enter to accept the number If you decide to cancel any changes you have made you may do so by pressing the Q Exit button This will immediately skip to the next coefficient Tf the coefficient also requires an exponent it will appear after setting the num ber as follows Increase or decrease the exponent using the 4 and Y buttons Once the expo nent is correct press Enter to accept it ITS 90 PRT and Coefficients The ITS 90 option is for PRTs calibrated and characterized using the Interna tional Temperature Scale of 1990 equations The parameters that appear when ITS 90 is selected are R0 01 A b C d A4 and b4 These shou
33. l price Hart reserves the right to invoice Buyer for importation costs of repairs replacement parts when product purchased in one country is submitted for repair in another country Hart s warranty obligation is limited at Hart s option to refund of the purchase price free of charge re pair or replacement of a defective product which is returned to a Hart authorized service center within the warranty period To obtain warranty service contact your nearest Hart authorized service center or send the product with a description of the difficulty postage and insurance prepaid FOB Destination to the nearest Hart au thorized service center Hart assumes no risk for damage in transit Following warranty repair the prod uct will be returned to Buyer transportation prepaid FOB Destination If Hart determines that the failure was caused by misuse alteration accident or abnormal condition or operation or handling Hart will provide an estimate or repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IM PLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE HART SHALL NOT BE LIABLE FOR ANY SPECIAL
34. ld be set with the corresponding values that appear on the calibration cer tificate for the PRT The parameter R0 01 takes the triple point of water resis tance often labeled Rtpw or R 273 16K on the certificate Parameters A b C and d take the an bn cn and d coefficients where n is a num ber from 5 to 11 Parameters A4 and b4 take the a4 and b4 coefficients or the a5 and b5 coefficients on the certificate Any ITS 90 parameter of the 1502A that does not have a corresponding coefficient on the PRT s certificate must be set to 0 The following table shows which parameter to set for each of the coefficients that may appear on the certificate The examples that follow demonstrate how to set the ITS 90 parameters for certain cases Note If the certificate has two sets of coefficients one set for zero power calibration and one set for 1 mA calibration use the coefficients for the 1 mA calibration Table 2 Matching Certificate Values to 1502A ITS 90 Coefficients 1502A ITS 90 Coefficient Certificate Value A a5 a6 a7 a8 a9 a10 or a11 b b5 b6 b7 b8 or b9 C c6 or c7 d d A4 a4 or a5 b4 b4 or b5 6 General Operation Selecting the Probe Characterization Example 1 A PRT was calibrated to ITS 90 and its calibration certificate states values for coefficients Rtpw a4 b4 a8 and b8 Set the 1502A parameters with values from the certificate as follows Tab
35. ld 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 Ambient temperature range Absolute 0 55 C 32 131 F full accuracy 16 30 C 61 86 F e Ambient relative humidity maximum 80 for temperature lt 31 C de creasing linearly to 50 at 40 C e Pressure 75kPa 106kPa e Mains voltage within 10 of nominal e Vibrations should be minimized e Altitude less than 2 000 meters e Indoor use only 4 Quick Start Unpacking 4 1 4 2 4 3 Quick Start This section briefly explains the basics of setting up and operating your 1502A thermometer readout Unpacking Unpack the thermometer carefully and inspect it for any damage that may have occurred during shipment If there is shipping damage notify the carrier immediately Verify that the following components are present e 1502A Thermometer e Extra Probe Connector e Power Cord e User s Guide e Probe optional must be purchased separately Power Your 1502A is configured for either 115 VAC 410 operation or 230 VAC 10 operation Be careful to only connect the 1502A to a mains supply of the correct voltage Otherwise the instrument may be damaged The required voltage is indicated on the back of the 1502A Power requirements are listed in Section 3 1 Specifications The IE
36. le 3 Setting Coefficients Rtpw a8 b8 a4 and b4 1502A Coefficient Certificate Value RO0 01 Rtpw A a8 b b8 C 0 d 0 A4 a4 b4 b4 Example 2 A PRT was calibrated to ITS 90 and its calibration certificate states values for coefficients Rtpw a5 and b5 Set the 1502A parameters with values from the certificate as follows Table 4 Setting Coefficients Rtpw a5 and b5 1502A Coefficient Certificate Value R0 01 Rtpw A a5 b b5 C 0 d 0 A4 a5 b4 b5 19 1502A Thermometer Readout User s Guide Example 3 A PRT was calibrated to ITS 90 and its calibration certificate states values for coefficients R 273 16K a6 b6 c6 and d Set the 1502A parameters with val ues from the certificate as follows Table 5 Setting Coefficients R 273 16 a6 b6 c6 and d 1502A Coefficient Certificate Value R0 01 R 273 16K A a6 B b6 C c6 D d A4 0 0 b4 0 0 6 4 4 Callendar Van Dusen RTD Conversion 20 The RTD conversion uses the Callendar Van Dusen equation tft rh a sal t20 r c 37 t t t t Ro31 a 1 6 7 af il b 1 lt 0 100 100 100 100 J The coefficients Ry a P and 5 can be set by the user They are indicated as O ALPHA bEEA and dELEA on the display The ALPHA coeffi cient is scaled by a factor or 1000 to allow adequate resolution For IEC 751 or DIN 43760 sensors the coefficients for r 0 ALPHA BEER and GELEA should b
37. lly Transmitting Measurements By setting the sample period the 1502A can be programmed to automatically transmit measurements from the RS 232 port at specified intervals The sample period can be set remotely using the commands SA hh mm ss lt EOS gt sets the sample period SA 0 lt EOS gt disables automatic transmission of measurements The value of the sample period can be from 0 seconds to 24 hours It is not nec essary to give hours or minutes for values in seconds A value of 0 disables au tomatic transmission of measurements Following are some example commands SA 10 lt EOS gt sets the sample period to 10 seconds SA 5 00 lt EOS gt sets the sample period to 5 minutes SA 1 00 00 lt EOS gt sets the sample period to 1 hour Selecting the Unit of Measurement The selected unit is used in displaying measurements on the front panel and in reading measurements from the communications interfaces The following commands can be used to select the unit of measurement U C lt EOS gt selects Celsius U F lt EOS gt selects Fahrenheit U K lt EOS gt selects Kelvin U 0 lt EOS gt selects ohms Enabling the Time Stamp Enabling the time stamp causes the time of the system clock to be transmitted along with measurement data The time stamp can be enabled or disabled using the following commands ST ON lt EOS gt enables the time stamp ST OFF lt EOS gt disables the time stamp Setting the Clock The system clock is set in 24 hour for
38. mands is given in Section 7 3 Serial Interface The 1502A is equipped with an RS 232 serial port The RS 232 interface is useful for connecting the 1502A to most any microcomputer The RS 232 socket is located on the back panel of the 1502A Wiring of the interface cable should be as shown in Figure 5 below To eliminate noise the serial cable should be shielded with low re sistance between the connector RS 232 Cable Wiring for DB 9 and the shield The pro IBM PC and Compatibles tocol for RS 232 communica tions is 8 data bits 1 stop bit and no parity The RS 232 inter Instrument Computer DTE face uses RTS and CTS for flow Connector Connector control DB 9 Pin DB 9 Pin 1NC 1DcD S 2 RxD 2RxD Setting the Baud Rate 3TxD 3np 4NC R 4DTR The 1502A must be set to the 5GND E 5 GND same baud rate as the remote ae beta SEN device The baud rate of the 8 CTS A BCTS 1502A can be set to 1200 2400 9NC 9NC 4800 or 9600 The default is 2400 The baud rate is set in the Comm menu Press the Menu Instrument Computer DTE button SEE appears then ia ala Connector DB 9 Pin DB 25 Pin press the K Comm button The e i 1NC display will briefly indicate 2 RxD 2TxD SEFIAL then bRUd and 3TxD e 3RxD then display the current baud ane TRIS 50D U 5CTS rate Use the 4 and buttons SNC O DK E LO DR to increase or decrease the baud 7 RTS 7ND
39. mat using the command CL hh mm ss lt EOS gt For example CL 14 24 00 sets the time to 2 24 pm Probe Characterization Commands The following commands relate to reading measurement data 29 1502A Thermometer Readout User s Guide 30 7 3 2 1 7 3 2 2 7 3 3 Selecting the Characterization The following commands can be used to select the probe characterization and coefficients P 90 lt EOS gt selects the ITS 90 characterization P 68 lt EOS gt selects the IPTS 68 characterization P R lt EOS gt or P S lt EOS gt selects the standard Callendar Van Dusen characterization RO lt value gt lt EOS gt sets R or R 0 01C depending on the selected charac terization AL lt value gt lt EOS gt sets ol for the Callendar Van Dusen or IPTS 68 char acterization DE lt value gt lt EOS gt sets 6 for the Callendar Van Dusen or IPTS 68 char acterization BE lt value gt lt EOS gt sets B for the Callendar Van Dusen characterization A4 lt value gt lt EOS gt sets a for the ITS 90 or IPTS 68 characterization B4 lt value gt lt EOS gt sets b for the ITS 90 characterization C4 lt value gt lt EOS gt sets c for the IPTS 68 characterization An lt value gt lt EOS gt sets a 4 Ag Ay Ayo OF A for the ITS 90 character ization n is a number from 6 to 11 10 Bn lt value gt lt EOS gt sets b b b or b for the ITS 90 characterization n is anumber from 6 to 9 Cn lt value gt lt EOS gt sets c
40. nd 200 resistors of 10 ppm accuracy are also required The resistors are connected to the input the same way probes are The calibration procedure is as follows 1 Connect a 0Q resistor to the input and measure its resistance Note the average error in the measurement Adjust the CALO parameter by sub tracting the measured error For example if the input is exactly 0 0000Q and readout shows 0 0011 the CALO parameter should be adjusted by adding 0 0011 to it 2 Connect a 100Q resistor to the input and measure its resistance Note the average error in the measurement Adjust the CAL100 parameter by sub tracting the measured error For example if the input is exactly 100 000Q and the readout shows 100 029Q the CAL100 parameter should be adjusted by subtracting 0 029 from it 3 Connect a 400Q resistor to the input and measure its resistance Note the average error in the measurement Adjust the CAL400 parameter by sub tracting the measured error For example if the input is exactly 400 000Q and the readout shows 399 991Q the CAL400 parameter should be adjusted by adding 0 009 to it 4 Verify the accuracy at OQ 25Q 100Q 200Q and 400Q The accuracy should be within the short term accuracy limits given in the specifications 9 Maintenance Maintenance e The calibration instrument has been designed with the utmost care Ease of operation and simplicity of maintenance have been a central theme in the product development
41. nt WEEE Directive 2002 96 EC mark Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired Refer to the safety information in Sections 1 2 1 and 1 2 2 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 AA Warnings To avoid possible electric shock or personal injury follow these guidelines DO NOT operate this unit without a properly grounded properly polarized power cord DO NOT connect this unit to a non grounded non polarized outlet DO NOT use this unit for any application other than calibration work DO NOT use this unit in environments other than those listed in the user s guide DO NOT use this instrument in combination with any probe to measure the temperature or resistance of any device where the probe might come in contact with a conductor that is electrically energized Severe electric shock personal injury or death may occur If this equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired 1 Before You Start Safety Information 1 2 2 Before initial use or after transport or after storage in humid or semi humid environments or anytime th
42. obe to the wrong terminals Check the wiring carefully see Figure 1 on page 12 e Open shorted or damaged sensor or lead wires Check the resistance across the sensor using a hand held DMM Also check the resistance be tween common pairs of leads Check to make sure there is no conductiv ity between any of the leads and the probe sheath Use a good quality sensor to avoid errors caused by drift hysteresis or insulation leakage e Electrical interference Intense radio frequency radiation near the 1502A or the probe can induce noise into the measurement circuits resulting in erratic readings The 1502A is intended to operate in a laboratory environ ment with limited radio frequency noise If interference seems to be a problem you might try eliminating the source of interference or moving the 1502A to a different location A well grounded shielded cable should be used for the probe leads 39 1502A Thermometer Readout User s Guide 40 10 1 10 1 1 e Stem conduction error The problem may be that the actual temperature of the sensor is not what you expect This is often the result of stem con duction where heat flowing through the stem of the probe to ambient af fects the temperature of the probe It is very important that immersion probes be inserted to an adequately depth into the material being mea sured Measuring temperature using a surface sensor can be especially difficult as the sensor is directly exposed to ambient
43. ommand returns the model number and firmware version number VER lt EOS gt returns the model and firmware version numbers The syntax of the response is as follows 7 Digital Communications Interface Remote Commands 7 3 6 2 ver mmmmm v vV The m s represent digits of the model number The v s represent the digits of the firmware version number As an example if the version number was 1 10 the response would be ver 1502A 1 10 The following IEEE 488 2 and SCPI compatible command can be used to read the manufacturer model number serial number and firmware version number IDN lt EOS gt returns identification data for the instrument The syntax of the response is as follows HART 1502A lt serial number gt v vv The v s represent the digits of the firmware version number As an example if the serial number was 6A1202 and the version number was 1 10 the response would be HART 1502A 6A1202 1 10 Reading a List of Commands The following command returns a list of commands H lt EOS gt or HELP lt EOS gt returns a list of commands 33 8 Calibration Procedure Accessing the Calibration Parameters 8 1 Calibration Procedure The 1502A uses a three point calibration scheme with a quadratic polynomial correction function to maintain the accuracy of its resistance measurement The three calibration points are at OQ 1000 and 4001 Three calibration pa rameters determine the correction function CALO CAL1
44. r needs to be replaced contact an Authorized Service Center This instrument and thermometer probes are sensitive and can be easily dam aged Always handle these devices with care DO NOT allow them to be dropped struck stressed or overheated Probes are fragile instruments which can be damaged by mechanical shock over heating and absorption of moisture or fluids in the wires or hub Damage may not be visibly apparent but nevertheless can cause drift instability and loss of accuracy Observe the following precautions DO NOT allow probes to be dropped struck bent or stressed DO NOT overheat probes beyond their recommended temperature range DO NOT allow any part of the probe other than the sheath to be immersed in fluid DO NOT allow the probe hub or wires to be exposed to excessive temperatures 1502A Thermometer Readout User s Guide Keep the probe wires clean and away from fluids 1 3 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 American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail supportO hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl Fluke Int l Corporat
45. ration report to verify that the coefficients you entered are correct Filtering While measuring temperature the readings may appear to vary This may be due to actual variations in temperature or electrical noise internal to the 1502A The filter helps to smooth variations in the measurements and improve resolu tion The drawback is that filtering tends to slow the response to changes in temperature You can increase the filter time constant to further improve accu racy and resolution or decrease the time constant to reduce the response time You can set it to any value between 0 and 60 seconds A value of 0 disables the filter The default time constant is 4 seconds To change the filter value enter the Sample menu This is done by first press ing the Menu button SEE appears then pressing the F Sample button The display will briefly indicate SA PAr then FILEEr then the current filter value Use the and Y buttons to increase or decrease the filter value then press Enter The next parameter in the menu the current will then appear Setting the Current You can select one of two options for the probe excitation current 1 0 mA de fault or 0 5 mA The current is set within the Sample menu Press the Menu button SEE appears then press the F Sample button The filter value will appear Press Enter to continue The display will briefly show Curr Ent followed by the value for the current You can use
46. rriage return Time Stamp and System Clock The 1502A has a built in system clock that counts hours minutes and seconds while the power is on The clock can be used to time stamp measurement data read from the communications interfaces When the power is switched on the clock is set to 00 00 00 You can set the clock to show the actual time of day This can be done within the Comm menu Press the Menu button SE 2 ap pears and then the Comm menu button The display will briefly show CL C then the current clock time in hours minutes and seconds The time is repre sented in 24 hour format with 00 hours meaning 12 00 a m and 23 hours meaning 11 00 p m Use the and buttons to move between digits The selected digit will flash Use the 4 and Y buttons to change the digit Once the digits are correct press Enter to accept the new time If you decide not to change the time press the Exit button instead The clock can also be set using the CL communications command CL hh mm ss lt EOS gt The time stamp allows you to record the time of day with measurements that are printed or transmitted to a computer The given time is the value of the sys tem clock at the time of transmission An example of time stamped readings is shown below t 31 787 F 14 04 40 t 31 788 F 14 04 50 t 31 792 F 14 05 00 t 31 793 F 14 05 10 The time stamp control is also accessed in the Comm menu Press the Menu button SEE appears
47. tion of critical parameters Large bright eight digit LED display Serial RS 232 interface standard IEEE 488 GPIB interface optional Detachable power cord Light weight small and portable Sturdy reliable construction 3 Specifications and Environmental Conditions Specifications 3 1 Specifications and Environmental Conditions Specifications Resistance Range 0Q to 4009 auto ranging Resistance Accuracy one year 0Q to 2002 0 0005Q 200 to 4009 0 0025 25 ppm of reading Resistance Accuracy short term 2 00 to 30 0 00052 300 to 400 0 0015 15 ppm of reading Temperature Range 200 C to 962 C 328 F to 1764 F Temperature Accuracy 3 1 100 C 0 004 C 0 C 0 006 C 100 C 0 009 C 200 C 0 012 C 300 C 0 015 C 400 C 0 018 C 500 C 0 021 C 600 C 0 024 C Temperature Coefficient of Resistance 1 ppm C Resistance Resolution 0Q to 2022 0 00012 20Q to 40022 0 0012 Temperature Resolution 0 001 C Probe Nominal R 0 01 C 25Q to 100Q RTD PRT or SPRT Probe Connection 4 wire with shield 5 pin DIN connector Maximum acceptable lead resistance 1000 Probe Characterizations ITS 90 sub ranges 4 6 7 8 9 10 and 11 IPTS 68 Ro 5 a4 and c Callendar Van Dusen R ot 5 and B Probe Excitation Current 0 5 and 1 mA user selectable 2Hz Measurement Period 1 second Digital F
48. to 1 mA CU 5 lt EOS gt sets the current to 0 5 mA Setting the Power Saver Activating the power saver can conserve power The power saver causes the display to blank if no front panel buttons are pressed for a given number of minutes The power saver can be set using the commands PS lt value gt lt EOS gt sets the power saver time in minutes PS 0 lt EOS gt or PS OF lt EOS gt disables the power saver The value is the power saver time out period in minutes It must be between 0 and 60 inclusive It is automatically rounded to a multiple of five minutes A value of 0 or OFF disables the power saver Communication Commands The following commands relate to external communications Setting the Duplex Mode When the RS 232 duplex mode is set to FULL all commands received by the 1502A from the RS 232 port are echoed back Setting the mode to HALF dis ables the echo The duplex mode can be set remotely using the commands DU F lt EOS gt sets duplex to full DU H lt EOS gt sets duplex to half Setting the Linefeed Option When the RS 232 linefeed option is enabled any data transmitted from the RS 232 port is terminated with a carriage return and a linefeed Disabling the linefeed sets the termination to carriage return only The linefeed option can be set remotely using the commands LF ON lt EOS gt enables linefeed 31 1502A Thermometer Readout User s Guide 7 3 5 7 3 5 1 7 3 5 2 7 3 5 3 7 3 5 4 7 3 6
49. trol and laboratory use EMC requirements 1998 As noted in the IEC 61326 1 the instrument can have varying configurations The instrument was tested in a typical configuration with shielded grounded probe and RS 232 cables Emissions may in non typical applications exceed the levels required by the standard It is not practical to test all configurations as the manufacturer has no control over the probes the user may connect to the instrument 10 Troubleshooting CE Comments 10 1 1 1 10 1 1 2 10 1 2 Immunity Testing The instrument was tested to the requirements for industrial locations This al lows the instrument to be used in all types of locations from the laboratory to the factory floor Criterion C was used for Electrostatic Discharge ESD IEC 61000 4 2 and Electric Fast Transit EFT Burst IEC 61000 4 4 If the instru ment is subjected to EFT conditions at 2kV the instrument may require the user to cycle the power to return to normal operation Emission Testing The instrument fulfills the limit requirements for Class A equipment but does not fulfill the limit requirements for Class B equipment The instrument was not designed to be used in domestic establishments 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 the IEC 1010 2 010 EN 61010 2 010 standards 41
50. uggested actions you might take Incorrect Temperature Reading While attempting to measure temperature the display shows an incorrect value If the temperature readings seem to be incorrect you should first check to see if the resistance is being measured correctly Select ohms to display resistance If the resistance is incorrect refer to the next subsection for troubleshooting incor rect resistance readings If the resistance is being measured correctly but the displayed temperature value is incorrect consider the following possibilities e One or more coefficients are incorrect This is a common mistake While entering coefficients it is easy to miss a digit or sign Check all the values carefully comparing them with the values on the calibration certifi cate for the probe e The selected conversion type is incorrect Check to make sure the cor rect conversion type ITS 90 RTD or IPTS 68 is selected e The measurement is out of range The 1502A may not be able to calcu late temperature accurately if the resistance is outside the valid range The measured resistance may be too low or too high if the actual temperature is too low or too high or if there is a problem with the sensor see below Incorrect Resistance Reading While attempting to measure resistance the display shows an incorrect value Consider the following possibilities e Poor or incorrect connection of the probe A common mistake is to connect the wires of the pr
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