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User Maintenance Manual/Handbook Issue 1.05 Software version

1. 3 11 Using and Changing Passwords All features that affect measurements calibration of milliK calibration data stored in the thermometer database are password protected All actions that would lead to loss of data clearing data logged to internal memory overwriting files are also password protected The milliK uses two passwords The main password is used to protect all functions that form part of the normal operator activity clearing logged data editing thermometer calibration Isothermal Technology Page 47 of 101 923 milliK Issue 1 05 _ISOT CH data A separate calibration password is used to protect the milliK s calibration These are both initially set to 1234 but should be set to something more secure before using the milliK To change a password press the Instrument F4 key use the keys to select Passworol and then press the fi key to open the Password Selection Window Please Select Change Password Change Calibration Password Use the keys to select which password you wish to change and then press the key to open the Change Password Window Change Password Old password New password Confirm password Use the keys to select each password entry in turn and then press the key to open a soft keyboard and enter the value The New Password and Confirm Password entries must be identical and at least 4 characters long in order to proceed Isot
2. document the calibration history of your milliK Typically a calibration process will involve measuring the pre adjustment calibration of the milliK then making any necessary calibration adjustments and finally checking the calibration after adjustment The calibration should be checked or adjusted in a temperature controlled environment between 19 and 25 C The milliK should be powered up press the Start key F4 in the opening screen to ensure that the measurement system is initialised and running and left to stabilise in the calibration environment for at least 3 hours before checking or adjusting its calibration All of the adjustment is implemented in software there are no adjustment potentiometers inside the milliK so as to maximise reliability and provide adjustment that does not drift with time or temperature The milliK provides the following software adjustments Gain adjustment for the 115Q range Gain adjustment for the 460Q range Gain adjustment for the 500k Q range Voltage offset adjustment for Channel 1 Voltage offset adjustment for Channel 2 Gain adjustment for the 115mV range Gain adjustment for the 30mA 4 20mA input range Offset adjustment for the internal reference junction sensor gt HD The gain adjustments are common to all channels There are no zero adjustments for the resistance ranges since the zero readings are more than adequate by design without the need for any adjustmen
3. Thermistors 2uA reversing Keep Warm Current ff SPRTs PRTs ImA and 1 428mA Cable Length 30m lt 10Q per core and lt 10nF between cores Input Connectors f SPRTs PRTs Lemo EPG 1B 306 HLN 6 pin gold plated contacts Thermocouples Miniature Thermocouple socket ASTM E 1684 05 4 20mA 4mm sockets Interfaces 10 100MBit Ethernet RJ46 socket USB 2 0 host 2 x RS262 9 pin D type plug 9600 Baud Display 89mm 3 5 QVGA 320 x 240 colour TFT LCD with long life LED backlight Operating Conditions fj Operating 0 40 C 32 113 F 0 95 humidity Temperature Conversions Full Specification 15 30 C 50 85 F 10 90 humidity Power 90 264V RMS 47 63Hz universal 6W maximum Size 255mm x 255mm x 114mm 10 x 10 x 4 5 W x Dx H i 2 25kg Sib 5 3 Isothermal Technology Page 98 of 101 923 milliK Issue 1 05 _ISOT CH _ 10 Approvals The milliK has been verified as complying with the regulatory requirements of the EU and FCC for electromagnetic compatibility and safety EU only 10 1 CE Declaration European Community Electromagnetic Compatibility Directive 89 336 European Community Low Voltage Directive 93 68 The milliK Precision Thermometer manufactured by Isothermal Technology Limited of Pine Grove Southport Merseyside PR9 9AG United Kingdom conforms to the requirements of the European Community Electromagnetic Compatibility Directive 89 336 and of the Europe
4. and then press the M key to proceed to the 4 20mA Calibration Adjustment Window Use the keys to select each parameter in turn and press the key to enter their values Isothermal Technology Page 70 of 101 923 milliK Issue 1 05 4 20ma4 Range Calibration Adjustment 1 Apply a 9 21m4 current to channel 3 Enter details for standards used and then press OK to adjust calibration Current Applied 9 999999 Standard S M 2 M52 552 Cancel Press the J4 F4 key to start the calibration adjustment Once started the calibration adjustment process cannot be aborted 5 3 8 Adjusting the RJC Sensor Calibration Before you can use the RJC calibration adjustment feature you must first attach a calibrated thermocouple to one of the channels and configure the channel for use with this thermometer see section 3 3 4 If you measure the ambient temperature with a calibrated PRT and use this as the known temperature for the calibration see section 5 2 6 for details you can reasonably use a good quality uncalibrated thermocouple the difference between ambient temperature and the reference junction will be very small so any error will not be significant If you use an uncalibrated thermocouple make sure that you set the thermocouple Conversion to the thermocouple type used Channel Channel 1 Status Thermometer Default Thermocouple Type Conversion Range Unit Reference Junction Samples Reading Read
5. C R C hR G hR The milliK supports this full third order conversion Use the keys in the Thermometer Window to select Conversion and then use the keys to select Polynomial Use the keys to select Coefficients and then press the M key to open the Polynomial Coefficients Window Isothermal Technology Page 45 of 101 923 milliK Issue 1 05 Polynomial coefficients 2 01142E 03 1 310384E 03 O Q00000E00 9 8993356 07 L TSCO C1In R402 nR n Use the keys to select each coefficient in turn and press the key to open a soft numeric keypad and enter the required value 3 9 8 Using a 4 20mA Transmitter with Linear Conversion 4 20mA transmitters source a current that is linearly dependent on the measured value A 4mA current indicates the minimum output value and 20mA indicates the maximum Current below 4mA 1s often used to indicate a fault condition in the transmitter To use linear interpolation of the current and determine the measured temperature use the keys in the Thermometer Window to select Conversion and then use the keys to select Linear Use the keys to select Coefficients and then press the key to open the 4 20mA Temperature Linear Conversion Window 4 0m4 Temperature Linear Conversion Temperature oC 100 00 Cancel Use the keys to select the temperature at either 4 or 20mA and press the key to open a soft numeric
6. self powered and loop powered and can control Isotech temperature sources sequencing through a programmable list of temperature set points whilst logging data to internal memory or a USB drive The milliK sets new measurement standards in its class lt 5ppm for SPRTs PRTs lt 2u V for thermocouples and lt 1uA for current transmitters The Windows CE operating system provides a simple and intuitive operator interface and with a wide range of interfaces USB RS232 Ethernet allows the user to access the comprehensive features of the milliK 1 1 Unpacking Your product should comprise the following items milliK Precision Thermometer power supply with interchangeable plug heads two Lemo 6 pin connectors null modem RS232 cable this user manual SE GE If any item is missing or damaged please report this immediately to your supplier If possible we recommend that you retain the packaging material in case you need to return the instrument for calibration or service 1 2 Safety The milliK is a precision instrument designed for use in a laboratory or light industrial environment It complies with the requirements of safety standard EN61010 1 2001 and is therefore safe to use in laboratory or light industrial environments It is not intended for use outdoors or in extreme environments refer to specification in Section 9 Isothermal Technology Page 5 of 101 923 milliK Issue 1 05 _ISOT CH _ The
7. 5 2 6 Reference Junction Compensation Accuracy ccccceesccceeceeeeseeneseeeeneeeseneees 64 2 Adj s ns the ali brat Om ssns na demon cotiaeaemnrnaeieendn 66 5 3 1 Starting the Calibration Adjustment Feature cc ccccceecccseeeceeseceeeeeeseeeees 66 5 3 2 Adjusting SPRT 115Q Resistance Range ec cceecccccesseeeceeaeeeceeeeaeneees 67 5 3 3 Adjusting PRT 460Q Resistance Range ccc cceescccnseeeeeeeseeesenseeeaenees 68 5 3 4 Adjusting Thermistor SOOkQ Resistance Range ccccccceseecccceeeeeeeeeeeeeeees 68 5 3 5 Adjusting Zero Voltage Offsets eccccssscccseccceseceseeeeeeseeeeeeeeeeeeeeeeeeeeeees 69 5 550 Aduse V Ol ape Gamisans a a a 69 5 3 7 Adjusting 4 20mA Transmitter Range sseesssesssesssersserssersserssersserssersserssse 70 5 3 8 Adjusting the RJC Sensor Calibration 0 0 0 0 eee cceccccseseceeeeceeeseceeseeeeeseeseseees 71 54 Exporting Calibration informationen onii aa aN 12 WA itt ACS and CS TN cote aaa aiai aE A let EEA dnt Senet dal ota Seanad 74 Eahweye Ea a UU Gepmenrertene ne tear owe me ger terre a cone wey creme oc ere ete 75 FE R5232 Interateneo n a E A E EE 75 7 1 1 Establishing an RS232 Connection ssesssesssessersserssersserssersseesseessserssersses 76 T2 Ethemet IMEE IC eei E E V7 SCPC OM AI SO ssc tary sesh ated ered od ne inchs we pas EE as whee ne sme add eats EEO 80 Sk Command Terminators esena ena a a d an 80 8 2 DCPLC OMmMaANnd SIUCIUITC isere eini in E
8. 923 milliK Issue 1 05 _ISOT CH _ 3 3 1 Using Internal Reference Junction Compensation The EMF developed by a thermocouple depends on the temperature difference between the measurement and reference junctions It 1s therefore necessary to know the temperature of the reference junction the point at which the electrical circuit changes to copper in order to calculate the temperature at the measurement junction The milliK measures the temperature of the contacts in the miniature thermocouple connectors on the front panel so that these can be used as the reference junction in the thermocouple system In this arrangement there is no externally accessible reference junction and wires that make up the thermocouple are connected to the milliK using a connector made of the same material as the wire itself It 1s essential that the correct typed connector is used with the thermocouple Reference F Junction Measurement M Junction When using a thermocouple with internal reference junction compensation the Reference parameter in the Window should be set to Internal see section 3 3 4 For greater accuracy you can use an external reference junction whose temperature is measured with a calibrated thermometer see section 3 3 2 or that is immersed in an ice point at O C see section 3 3 3 3 3 2 Using External Reference Junction Compensation The milliK allows you to measure the temperature of an external refere
9. CURRent GAIN oo ccc cccecsecescecsescesensesenss 95 8 6 34 Command CALibrate RJC OFFSet oo cc ceccccececeseecnsescsescesensesenss 95 8 06 39 Command CALibrte RIC OPP SGU riranin thee tet eaces themes 96 8 6 36 Command CALibrate IDENtification ccc ccc ecsececcecnsescsescesensesenss 96 8 6 37 Command CALibrate IDENtification oo cece cccsccsccececescsescesensesenss 96 8 6 38 Command CALibrate IDENtification LAST ooo cece eececeeceeenee seuss 96 8 6 39 Command CALibrate PASSWOtd cece eccecesceseecnccsccescecescescusescuseseess 97 8 6 40 Command CALibrate VALI oo ccc cececcsceccsscscnsesccescecensesensesccesenss 97 OE IO CMTC CO IN ENEAS ERE ESEE ce en PEAT ae ea ees eg ea Ad cach ees agi ade a aa 98 IO AND PEOV AIS actus iae unseen 99 10 1 CE Dec elec cle alee tre eens emery re T eet TD mete ire eRe Se me Se SE a eee een 99 10 2 FEC SEA On ee mn ere eee ert ae ee Re cee A cree erro eee ee 99 10 3 SUANnG ards AP Pie dicesar n ade daa tad ede a cee aces 100 ML Revision Histo Ys doicnd st vies eee nc hrabie ec a a wee en 101 Isothermal Technology Page 4 of 10I 923 milliK Issue 1 05 _ISOT CH _ 1 Introduction The milliK precision thermometer provides a complete measurement and control interface for users wishing to make high accuracy temperature measurements or calibrate thermometers It supports a wide range of thermometer types including 25Q SPRTs 100Q PRTs thermistors thermocouples and 4 20mA transmitters
10. Page 51 of 101 923 milliK Issue 1 05 lt name gt Time Minutes Temperature oC immediately Cancel Use the keys to move between items and then press the key to open a keyboard Window to enter values Press the key whilst Immediate is selected to toggle between Immediate profile starts as soon as the F4 key is pressed when the profile is selected and On Save profile starts when you start logging data with the Start Save button see section 3 8 The Time is the time interval between the last and current set point change Name PRT Cal 0 2002 Time Minutes Temperature oC Immediately 0 50 00 Cancel To create a fixed set point make only a single temperature entry Isothermal Technology Page 52 of 101 923 milliK Issue 1 05 _ISOT CH _ 4 Connecting Thermometers to milliK Channels 1 and 2 on the front of the milliK are intended for connection to either resistance thermometers PRTs SPRTs or thermistors or thermocouples Each channel is equipped with a Lemo 6 pin circular connector for resistance thermometers and a miniature thermocouple connector Isotech can supply thermometers fitted with connectors suitable for use with your milliK In addition each milliK is supplied with 2 Lemo connectors for you to fit to your own thermometers The part number of these Lemo connectors is FGG 1B 306 CLAD62Z Additional connectors are readily available internation
11. Page 66 of 101 923 milliK Issue 1 05 Calibration Date 08 04 2011 Name John Smith Company Isothermal Technology Location Secondary Lab Room TAC 19 210 Export Press the OK F4 key to proceed to the Calibration Menu Window Flease Select 115 Range 4 20m Range Export 5 3 2 Adjusting SPRT 1150 Resistance Range Connect a calibrated nominally 100Q resistor to channel 1 In the Calibration Menu Window use the keys to select 115Q Range and then press the M key to proceed to the 115Q Calibration Adjustment Window Use the keys to select the two required parameters in turn and press the key to enter their values Isothermal Technology Page 67 of 101 923 milliK Issue 1 05 115 Range Calibration Adjustment 1 Attach a nominally 100 Range Resistor to Channel 1 Enter details for standard and then press OK to adjust calibration Resistor Value g og 9008s Resistor S N Press the J4 F4 key to start the calibration adjustment The milliK will then take a number of readings of the attached resistance standard calculate and then apply an appropriate adjustment A progress bar appears showing the status of the calibration adjustment Please wait performing calibration Once started the calibration adjustment process cannot be aborted 5 3 3 Adjusting PRT 460Q Resistance Range Connect a calibrated nominally 400Q resistor to channel 1 In th
12. by defining the conversion in the milliK s thermometer database see section 3 9 1 Press the Settings F3 key to access the Window which opens with the Channel parameter selected Use the keys to select Channel 3 and then use the keys to select each parameter in turn and set it to the required value either by using the keys to sequence through the options or pressing the key to open a new Window with all the options listed A typical configuration for a 4 20mA transmitter that indicates temperature would be Channel Channel 3 Status Thermometer Type Conversion Range Units 1 SamplesReading SSS Readings in Stats Numeric Settings Instrument Set the Thermometer to Default 4 20mA if you just want to measure the output in mA Channel Channel 3 Status Thermometer Type Conversion Range Units Samples Reading Readings in Stats Numeric Instrument Once you have configured the milliK to work with your 4 20mA transmitter press either the Graph F1 or Numeric F2 keys to view the measurements Isothermal Technology Page 31 of 101 923 milliK Issue 1 05 Std Dey OOO 1 Std Dev Settings Instrument Use the keys to select and activate the on screen buttons to select the channel clear the graph statistics clear the statistics Numeric Window and start stop logging of data to a file 3 5 Measuring the Difference Between Two Channels The milliK can display the differ
13. example in the above command tree we may use SENSe RESistance RANGe Isothermal Technology Page 80 of 101 923 milliK Issue 1 05 _ISOT CH _ Keywords can be shortened to the first four letters or 3 1f the last letter is a vowel To indicate this the notation uses upper case to indicate required letters and lower case to indicate optional letters NB all commands are case insensitive For example valid forms of the above command include Sense Resistance Range SENS RES RANG Sense resistance RAnG To shorten the commands default optional keywords are enclosed in square brackets and may be omitted For example in the case of the command MEASure SCALar VOLTage DC Valid forms of this command include MEAS VOLT MEASURE SCALAR VOLTAGE DC 8 3 SCPI Numeric Suffices In order to support multiple input channels commands can include numeric suffices These are represented by a hash in the command notation for example MEASure VOLTage lt channel gt In order to measure the voltage on channel 2 the command used would be MEAS VOLT2 8 4 Parameters If a command requires parameter s these follow the command and are separated from it by a space If more than one parameter is required each parameter is separated by a comma For example the command to measure resistance on channel 1 using a range up to 100 ohm at the normal ImA sense current using a 4 wire technique is MEAS RES1 100 NO
14. file that can be exported for viewing on a PC giving the whole calibration history of the instrument from its initial factory calibration The milliK includes calibration software that allows you to adjust all the calibration parameters Adjustment simply requires you to attach reference standards calibrated resistors voltage source or current source to the milliK and invoke the calibration features Typically a calibration adjustment involves the following Adjust 100Q reading on the 115Q range Adjust 400 Q reading on the 460Q Adjust 500k Q reading on the 500Q Adjust OmV reading on channel 1 Adjust OmV reading on channel 2 Adjusting 100mV reading on the 115mV range Adjusting 10mA reading on the 30mA range Adjusting the offset for the reference junction sensor gt 5 3 1 Starting the Calibration Adjustment Feature Press the Instrument F4 key use the keys to select Calibration and then press the key to start the calibration You will be asked to enter the calibration password see section 3 11 after which the Calibration Window will appear use the keys to select each parameter in turn and then press the key to enter information that allows the calibration to be identified This information is stored in the calibration file for information purposes only and you will not be allowed to proceed without entering something at least one character for every parameter Isothermal Technology
15. keypad and enter the required value Isothermal Technology Page 46 of 101 923 milliK Issue 1 05 _ISOT CH _ 3 10 Updating the Software Isotech periodically issue updates to the software to improve performance or add new features We recommend that you register for update notification Isotech will then send you an email advising you of updates and new features as they become available To register go to http isotech info milliK The software in your milliK can easily be updated by plugging a USB drive with the updated files MUST be in root directory into the USB port on the rear of the milliK and selecting the update software feature Press the Instrument F4 key and use the keys to select Restart Update Softwarek you will then be asked to enter the password in order to continue The milliK will then display any updates that are found on the USB drive and give you the option to implement the update before restarting the software The software is divided into two parts The first is designated software and provides the user interface The second is designated firmware and manages the hardware that performs the measurements The update software feature looks for updates to both parts and allows you to install each one individually The version number of the software and firmware are shown in the opening Start Window millik S H 10 P196 software version 1 3 6 firmware wersion 1 07 miliskanners detected none
16. mean and standard deviation of the most recent readings The number of readings in these rolling statistics can be set independently for each channel in the Window Press the Settings F3 key to open this Window use the keys to select the required channel and then use the keys to select the Readings in Stats setting Isothermal Technology Page 33 of 101 923 milliK Issue 1 05 Channel Channel 1 Status Enabled Thermometer AUPT ther mocple Type conversion Range Units Reference Junction Samples Reading Readings in Stats 100 Numeric Settings Instrument Press the key to open a numeric keypad Window and set the required value between 1 and 1000 The rolling statistics can be cleared in the Window Use the keys to select the KOLES ERI button and then press the M key to clear the statistics Channel 1 100 002344 Mean of 100 100 00242 comes E v 100 0026 100 0025 100 0024 100 0023 100 022 63250 63260 632 70 63260 63290 Settings Instrument 3 8 Logging Results to a File The milliK can store results to a file on an external USB drive connected to the USB port on the rear of the instrument or to internal flash memory Files stored to internal memory can be transferred to an external USB drive at a later date The information is stored as comma separated CSV ASCH text which can be imported into applications such as Microsoft Excel for further processing Start or stop the logging of d
17. milliK is likely to be connected to thermometer sensors in use and the operator should take care to ensure that the complete system is safe For example metal sheathed thermometers may be connected to the milliK and then placed in a furnace powered from a 230V electrical supply Single fault conditions in such a furnace could lead to the thermometer wires and the front terminals of the milliK to which they are connected becoming electrically live and therefore a hazard to the operator Suitable precautions should be taken such as using an isolating transformer in the supply to such a furnace If you require further advice on safety issues please contact Isothermal Technology or one of our appointed distributors we have extensive experience of thermometry and can provide advice and equipment to help you Retain these instructions Use only as specified in these operating instructions or the intrinsic protection may be impaired Please observe the following safety precautions Do not use your milliK if it is damaged Only connect the power supply to an electrical supply that conforms to the specification given on its rating plate This equipment is for indoor use within an ambient temperature range of 0 C to 40 C with maximum relative humidity of 95 This equipment is for use in moderate climates only NEVER use the equipment in damp or wet conditions Avoid excessive heat humidity dust amp vibration Do not pla
18. of how to do this and then when the milliK is running and making the required measurement send the command MONITOR lt channel gt 4 Where lt channel gt is the number of the channel from which you require the measurement and 4 defines a four second timeout for the command The milliK will then echo the measurement the next time a results is available for that channel It will report the value and units for example 9 87654321E 001 C Where units R for ohms mV for milli volts K for Kelvin C for C F for F If the milliK detects that the requested channel is not enabled it will report Channel Not Enabled Isotech s Cal NotePad software supports the milliK product using the MON command and can be downloaded from http isotech info millik Isothermal Technology Page 84 of 101 923 milliK Issue 1 05 72 Isotech CNP Version 3 File Help Instrument Heat Source Chart Log 22 000 21 000 20 000 19 000 16 000 17 000 16 000 15 000 14 000 13 000 12 000 11 000 10 000 4 Running 0 Measurements Instrument fi 2 3 E EEE J millik j 20 834 21 138 110 465 COM Port 2 an PH J 2 0 000 0 000 0 000 0 000 6 000 Isothermal Technology Page 85 of 101 923 milliK Issue 1 05 _ISOT CH _ 8 6 4 SCPI Commands The milliK supports the following commands IDN SENSe FUNCtion ON FUNC
19. of the number of samples but also slow down the update rate The resistance of a thermistor can be measured without entering any calibration information by declaring the Thermometer as a Default Thermistor This can be useful when calibrating thermistors against other thermometers Isothermal Technology Page 24 of 101 923 milliK Issue 1 05 Channel Channel 1 Status Enabled Thermometer Default Thermistor Type Conversion Range SOOks Units Current Samples Reading Readings in Stats Numeric Settings Instrument Once you have configured the milliK to work with your thermistor press either the Graph F1 or Numeric F2 keys to view the measurements 2540 25a 25610 25 0 Numeric Settings Instrument Use the keys to select and activate the on screen buttons to clear the graph statistics set the scales and start stop logging of data to a file 3 3 Using a Thermocouple with millik The milliK can be used with any thermocouple calibrated or uncalibrated fitted with a standard miniature thermocouple connector Connect your thermocouple to either of the miniature thermocouple connectors on the front panel Ensure that the Lemo circular connector for the same channel is unused since it is connected in parallel with the thermocouple connector Isotech supply thermocouples fitted with standard miniature thermocouple connectors for direct connection to your milliK Isothermal Technology Page 25 of 101
20. sicisinescsecens sanansanaineutan sananeeanteiitan EE 53 4 1 Connecting PRTs SPRTss to milliK 0 cc cecccceeecceeeeceeeeeeseeeceeneeeseeeeseneeseees 53 4 2 Connecting Thermistors to milliK 2 0 0 eccccseecceeececeeseeeeneeeseseceeneeeenseeeeneeeees 54 Isothermal Technology Page 2 of 01 923 milliK Issue 1 05 _ISOT CH _ Nn 435 Connectine Thermocouples to milli Kain i iniiniieiieidiiileieid diese Awe 55 4 4 Connecting 4 20mA Transmitters to milliK s seseesseessoessorssersssrsssesssesssesssessserss 56 AB PATIO Meats senetebs yecccwa batoiauetaceaenanetesua a neon sue nde EEE gt 5 1 Standards Required for Calibration 2 00 0 cccceccccseccceeeeeceeeecaseeeeneeeseseeeenseeaeeenees 58 5 1 1 Making a 4 Terminal Short Circult c cc ecccceccccseccceseceeeeeeeeseeeeneeeeeseeseneees 58 5 1 2 Making aQmV Source in a Thermocouple Connector ccceececeeeeeeeeeees 59 a2 Checking the Calibration irisssssticasasanseadenstinabanaais d aaa alaaa 59 Sal PRIS PIED Resistance Ran Ge vi 2 ccatieneschchssecedunchadehthe tectdonteteaent EEN 60 5 2 2 Thermistor Resistance Range SOOkQ Span Check ceceeccceeeeeeeeeees 6l 5 2 3 Thermocouple Voltage Range Zero Check sss sssessserssersseessersssesssrssersse 62 5 2 4 Thermocouple Voltage Range Span ChecK ssssenssenssesserssersseesssrsseesse 63 5 2 5 4 20mA Transmitter Range Zero and Span Check ccc ccccceseeceseeeeeeeeees 63
21. typical configuration for an uncalibrated type K thermocouple using internal reference junction compensation would be Channel Status Thermometer Default Thermocouple Type Conversion Range Units Reference Junction SamplesReadng LS Readings in Stats Numeric Settings Instrument In order to use external reference junction compensation see section 3 3 2 you must enable and configure one of the other channels to measure temperature using a PRT SPRT or thermistor This channel will then appear as one of the options in the Reference Junction parameter A typical configuration for a type T thermocouple using external reference junction compensation by a PRT connected to channel 2 would be Isothermal Technology Page 28 of 101 923 milliK Issue 1 05 Channel Channel 1 Status Enabled Thermometer Default Thermocouple Type Thermocouple conversion Type K Range Units Reference Junction Samples Reading Readings in Stat Numeric Settings Instrument The lowest uncertainty can be achieved with a thermocouple by using an ice point as the reference junction see section 3 3 3 A typical configuration for a calibrated gold platinum thermocouple entered into the database as AuPt thermocpl and using an ice point reference would be Channel Channel 1 Status Enabled Thermometer AUPT ther mocple O at hermope Type conversion Type AU Pt Range 1150 Units Reference Junction samples Read
22. wish to change and then use the keys to change it to the required value If a channel is not being used it is best to change its Status to Disabled as this will then make the measurement time available to other enabled channels which will speed up these measurements The Type field is for information Isothermal Technology Page 13 of 101 923 milliK Issue 1 05 _ISOT CH _ purposes only and cannot be changed Pressing the key when the Thermometer setting is selected opens a Window with a list of all thermometers in the milliK s database Select Thermometer Default 3 Wire PRT Default 4 Wire PRT Default Thermistor Default Thermocouple AuPt thermocple Use the keys to highlight the required thermometer and press the F4 key to select it The CERI EAD F2 F3 keys below the display provide easy navigation if a large number of thermometers has been created Press the key when the Samples Reading or Readings in Stats settings are selected to Open a numeric entry window and specify a value This may be quicker than using the keys to change the value Use the keys to move to a number button and select it using the key As soon as you start entering a new number the original value is deleted Press the OK F4 key to apply the new value Isothermal Technology Page 14 of 101 923 milliK Issue 1 05 _ISOT CH The Samples Reading setting is initially set
23. with your milliK Type IDN into Hyperterminal terminate the command by pressing the carriage return or Enter keys the milliK should then respond with a string in the form Isothermal Technology milliK 1 1 P234 1 0 7 This confirms that you have successfully established an RS232 connection with your milliK 7 2 Ethernet Interface You can connect your milliK to a local area network Ethernet LAN and control it from a remote PC The milliK can be used with a fixed IP address or acquire its IP address from a DHCP server on the network To select the whether a static fixed or dynamic DHPC address is used and set the address static press the Instrument key F4 use the keys to select Instrument Settings and press the M key to open the Instrument Settings Window Isothermal Technology Page 77 of 101 923 milliK Issue 1 05 Address Type IF Address Subnet Mask Cancel Use the keys to select each parameter and then press the key the open a numeric window and enter the value In the case of the Address Type parameter the key toggles the between Static and Dynamic Connect the millik s Ethernet port RJ45 connector on rear panel to your LAN using a standard non cross over patch cable Then launch the CE6 cerhost exe application this Microsoft freeware application can be downloaded from http isotech info milliK Remote Display Contr m Ex File zoom Display Tools Help
24. your thermometer calibration is presented using Callendar Van Dusen coefficients a b c or a B 0 use the keys in the Thermometer Window to select Conversion and then use the keys to select Callendar Van Dusen Use the keys to select Coefficients and then press the key to open the Callendar Van Dusen Coefficients Window Isothermal Technology Page 41 of 101 923 milliK Issue 1 05 Calendar van Dusen coefficients Eqn Form Cancel Use the keys to select each parameter in turn and press the key to open a soft numeric keypad and enter the value from the calibration certificate If no coefficient is supplied not all coefficients are required set the value to zero Select Eqn Form and press the key to toggle between the a b c and a 8 6 versions of the equation The milliK will automatically convert the coefficients as you change the equation form selected 3 9 4 Using a PRT with ITS90 Conversion In 1990 the International Temperature Scale was revised and a new set of equations were defined for converting the resistance of a PRT to temperature These equations commonly referred to as ITS90 comprise a nominal conversion that represent the average conversion characteristic and deviation functions that provide the adjustment for the characteristics of the individual thermometer They are intended for use with high purity platinum and provide a better fit than can be achieved with the olde
25. 006 Flicker EN61000 3 3 2008 Electrical Safety EN61010 1 2001 Isothermal Technology Page 100 of IOI 923 milliK Issue 1 05 _ISOT CH _ 11 Revision History Change Note April 2011 CN11008 17 06 2011 CN12002 07 02 2012 CN 12013 16 05 2012 CN 12014 30 05 2012 Isothermal Technology Page 10I of IOI 923 milliK Issue 1 05
26. 8 6 25 Example to unlock enable the calibration adjustment on a milliK with the default password 1234 use CAL UNL 1234 8 6 25 Command CALibrate LOCK Format CALibrate LOCK Locks the milliK to prevent calibration adjustment Example to lock the calibration of a milliK after adjustment use CAL LOCK 8 6 26 Command CALibrate RESistance GAIN Format CALibrate RESistance GAIN lt range gt lt current gt lt gain gt lt standard gt Isothermal Technology Page 92 of 101 923 milliK Issue 1 05 _ISOT CH _ Sets the resistance measurement lt gain gt for the specified resistance lt range gt and lt current gt with the option to specify the lt standard gt used Gains outside the range 0 99 to 1 01 are ignored The optional lt standard gt parameter is a string that is stored in the calibration database file which can be exported to a USB flash drive see section 5 4 and can be used to identify the calibration standard used Typically it would be used to identify the serial number of the standard The lt current gt can be specified as either NORMal or ROOT2 Example for a milliK that has been found to require a resistance gain of 1 001234 for the resistance range 0 460Q with normal 1mA sense current by using a resistance standard with serial number xyz1956 the gain can be set using CAL RES GAIN 460 NORM 1 001234 SN_xyz1956 or CAL RES GAIN 460 NORM 1 001234 8 6 27 Command CALibrate RESista
27. ALibrate VOLTage GAIN lt gain gt lt standard gt lt additional info gt Sets the lt gain gt used for voltage measurements Gains outside the range 0 98 to 1 02 are ignored The optional lt standard gt and lt additional info gt parameters are strings that are stored in the calibration database file which can be exported to a USB flash drive see section 5 4 to provide information about this calibration Typically lt standard gt would be used to identify the serial number of the voltage standard used The lt additional info gt parameter is provided so store an additional serial number in case two standards are used precise low voltages are often realised by using a calibrated reference resistor together with a current source Example for a milliK that has been found to require a voltage gain of 1 001234 by using a standard resistor with serial number xyz1956 and a current source with serial number abc9960 the gain can be set using CAL VOLT GAIN 1 001234 SN_xyz1956 SN_abc9960 or CAL VOLT GAIN 1 001234 8 6 31 Command CALibrate VOLTage GAIN Format CALibrate VOLTage GAIN Reports the voltage measurement gain Example a milliK with a voltage gain set to 1 001234 will respond to CAL VOLT GAIN with 1 001234 8 6 32 Command CALibrate CURRent GAIN Format CALibrate CURRent GAIN lt gain gt lt standard gt Isothermal Technology Page 94 of 101 923 milliK Issue 1 05 _ISOT CH _ Sets the lt gain
28. Click on File and then Connect to establish connection with the milliK a Connect Window will then appear and after a few seconds it will show a list of available devices that includes the milliK the milliK will be listed as Tritonxx where xx is a number assigned to the milliK in case you have more that one connected to the LAN Isothermal Technology Page 78 of 101 923 milliK Issue 1 05 Remote Display Contr Sle Connect Active target devices Triton00 Cancel Click on the required device TritonOO in the above example and then click OK cerhost will then establish a connection and display the screen as it appears on your milliK si TritonOO B B Fie zoom Display Tools Help Fa EA fag Fa EA PT fag 0 3226 Mean of 100 Std Dey 0 4 0 4 Oe 1 S100 3200 3300 S400 3300 S60 3 00 Settings Instrument Click ToolslConfig and select the Whole Screen radio button in the Update area to ensure that the screen remains synchronised with your milliK You can control your milliK using mouse clicks or the keyboard function keys and up down left right enter keys provided cerhost is the currently selected application on your PC Isothermal Technology Page 79 of 101 923 milliK Issue 1 05 _ISOT CH _ 8 SCPI Command Set The command format and protocol used by the milliK is based on the SCPI Standard Commands for Programmable Instruments standard Thi
29. D Example to make a current measurement on channel 3 use MEAS CURR 8 6 22 Command MEASure SCALar RJC Format MEASure SCALar RJC Initiates and reports a measurement of the internal reference junction temperature used with thermocouples for reference junction compensation The reported value is in C Isothermal Technology Page 91 of 101 923 milliK Issue 1 05 _ISOT CH _ Example to measure the temperature of the thermocouple reference junction use MEAS RJC 8 6 23 Command MONitor lt channel gt Format MONitor lt channel gt lt timeout gt Reports the next measurement including units made on lt channel gt within the specified lt timeout gt in seconds If a measurement is not made within the specified timeout the milliK reports Timeout If the milliK detects that the channel is not enabled it reports Channel Not Enabled The milliK reports the value followed by the units separated by a comma Where units R for ohms mV for milli volts K for Kelvin L for C F for F Example if channel 2 is configured to measure temperature in C a typical response to MON2 5 would be 1 23456 C 8 6 24 Command CALibrate UNLock Format CALibrate UNLock lt password gt Unlocks the milliK to allow calibration adjustment The milliK always powers up in the locked state Calibration can be re locked by cycling the power to the milliK or using CAL LOCK see section
30. E ENTE TT 80 S OCPI NUMEMG SUCO aeea a a a a May decodes 81 Se PARAM loi pearance eae adea te tance andes Gees eects ees 81 S20 Unien a E ee ee ee ee 82 8 6 Making Measurement Using SCPI Commands ccccccceccccsescceeeeeeeeseceeeeeeaeees 82 8 6 1 Measuring Resistance using SCPI Comma nd6 cccccccseecccsececeeseceeeeeaeees 83 8 6 2 Measuring Voltage using SCPI Commands ccccccecccceescccseeeceeseeeneeeaeees 83 8 6 3 Measuring Temperature using SCPI Commands cccceccccesecceseeeneeeaeees 84 86 4 SCPP Commands rrrctocrccssiossscsheaistadouiacshodice aia E Meedetbauas 86 803 Command IDN ogie a Tac wed raea dca vied valet ward dan ed AAEE 87 8 6 6 Command SENSe FUNCtiOon ON 0 ec cccectccnseecesescsescesensesenss 87 507 Comimand SENSe FUNCHONF ON zieren a E A E ERA 87 8 0 8 Command SENSe CHANDNEe L sinc sechois nec enine nae 87 620 9 Command S ENSE CHANDE vei deseo tin ceive Dosti ran iti ialaxtedneisd 88 8 6 10 Command SENSe RESistance RANGe UPPer ccc eee ec eeees 88 8 6 11 Command SENSe RESistance RANGe UPPer oo eee ece ec eeees 88 8 6 12 Command SENSE RESistance W RESiicigeiecsiecsienudesieiiieteleiesivcieiedenevi tes 89 8 6 13 Command SENSe RESistance WIRES 2 0 00 cccccceccccescccseeeceesecceneecaeseeeenseesenes 89 6 0 14 Command SENS CURR ers A eas een 89 80 15 Command SEN Se C VIR Cn arsed celsius ce led ccusbicats Sralend caveat suslaudecnt aaa 90 Is
31. RM 4 Isothermal Technology Page 81 of 101 923 milliK Issue 1 05 _ISOT CH _ 8 5 Units Numeric parameters may optionally include units if you omit units the milliK assumes appropriate default units The only units required for milliK are ohms which are indicated by R r or OHM and volts indicated by V or v The standard multiplying prefixes may also be used to indicate decimal multiples or fractions For example the following are all equivalent CAL VOLT OFFS1 2E3uV CAL VOLT OFFS 1 2 note default units are mV CAL VOLT OFFS1 0 002V The following prefixes are available prefix name factor Uoru micro 10 M or m milli 10 cannot be used with ohms see note below Kork kilo 10 Note The SCPI standard does not permit the use of M or m as a prefix for ohms to indicate milli ohms since the M or MA prefix is used to indicate mega ohms 8 6 Making Measurement Using SCPI Commands The milliK s measurement system can be controlled by SCPI commands from either of the RS232 ports The software makes no distinction between commands received on either port and will process these in the order in which they are received If a response is expected it will always be sent to the port on which the initiating command was received There is no direct interference between measurements made using the front panel operator interface and measurements requested using SCPI commands Howev
32. RTs that are made with a grade of wire that meets the requirements of the standard The measurement uncertainty will depend on the class of thermometer and its temperature and can vary from 0 15 C Class A Pt100 at 0 C to 4 6 C Class B Pt100 at 850 C Isothermal Technology Page 40 of 101 923 milliK Issue 1 05 _ISOT CH _ In the Thermometer Window use the keys to select Conversion parameter and then use the keys to select IEC60751 2008 This standard uses the Callendar Van Dusen equation to convert resistance to temperature To view the coefficients used in IEC60751 2008 select Coefficients and press the M key You cannot change these coefficient but you will be able to view the coefficients used in the IEC60751 2008 standard IECOO7S1 2008 coefficients Eqn Form 3 9 3 Using a PRT with Callendar Van Dusen Conversion PRTs and SPRTs can be calibrated individually resistance temperature characteristics determined in order to achieve low uncertainties There are two algorithms used to represent the thermometer s characteristic the Callendar Van Dusen equation and the ITS90 equations The Callendar Van Dusen equation was developed first and was used as the primary conversion algorithm for all PRTs up until 1990 It is still applicable for PRTs and SPRT although better uncertainty can be achieved by using the ITS90 equations particularly important when using higher accuracy SPRTs If
33. _ISOT CH For a milliK with serial number 11 P123 the file will be stored to the USB drive at A milliK 1 1 P123 Calibration CalibrationFile txt Isothermal Technology Page 73 of 101 923 milliK Issue 1 05 _ISOT CH _ 6 Maintenance and Cleaning Your milliK is a precision electronic instrument intended for indoor use in a laboratory office or light industrial environment Nonetheless it has been designed to be as robust as 1s practical and will provide many years of service provided it is properly maintained The screen touch panel and case can be cleaned with a damp not wet cloth Use either a proprietary screen cleaner suitable for PC flat panel displays or water and a little mild liquid soap on a lint free cloth to clean your milliK Dry the screen and touch panel immediately after cleaning with a lint free cloth Never use abrasive cleaners such as cream cleaners or solvents on your milliK Miniature thermocouple plugs are of variable quality and lower quality versions can cause wear to the contacts in your milliK If you feel that the thermocouple sockets on your milliK are becoming stiff you can apply a small amount of contact lubricant Electrolube CG53A is suitable available internationally from Farnell Electronics via their website www farnell com under Farnell stock code 725602 onto the blades of a thermocouple plug and insert into the milliK thermocouple sockets several times Isothermal Technolo
34. aking a OmV source is to take a copper miniature thermocouple plug and short together the two pins of the connectors with a short length of copper wire The copper wire should remain inside the connector housing be as short as possible and go directly between the two terminals of the connector Ideally the wire used should be high purity copper but single stranded copper wire tinned plated or unfinished will provide adequately low thermal EMFs in this arrangement Using a longer even just 15mm in length piece of normal wire that goes outside the connector housing can produce measurable thermal EMFs 5 2 Checking the Calibration The calibration of the milliK can easily be checked by attaching reference standards calibrated resistors voltage source or current source to the milliK and measuring their values Typically you would check the following OQ reading on the 115Q range 100Q reading on the 115Q range 400 Q reading on the 460Q 500k Q reading on the 500Q OmV on the 115mV range HEP gt Isothermal Technology Page 59 of 101 923 milliK Issue 1 05 _ISOT CH _ 100mV on the 115mV range 10mA on the 30mA range A known temperature measured using a thermocouple and internal reference junction compensation eo The measurements should be made independently on both channels 5 2 1 PRT SPRT Resistance Range Checking the resistance ranges used for PRT SPRTs 115Q and 460Q involves checking the values in
35. alid it will provide an error code that should be reported to Isotech when requesting technical support Example a correctly calibrated milliK will respond to CAL VAL with Calibration Okay Isothermal Technology Page 97 of 101 923 milliK Issue 1 05 _ISOT CH 9 Specification Inputs f Channel 1 amp 2 Channel 3 rear panel SPRT PRT thermistor Thermocouple 4 20mA current loop with optional 24V loop supply Ranges f SPRTs 0 115Q PRTs 0 460Q Thermistors 0 500kQ Thermocouples 115mV 4 20mA 0 30mA Accuracy Initial Over year SPRTs PRTs Sppm 7ppm Thermistors SOppm 150ppm Thermocouples 2uV at 50mV 4uV at 50mV 4 20mA 0 01 0 02 Initial Over year SPRTs PRTs at 0 C 3mK 4mK over full range SmK 7mK Temperature Accuracy Type B Type E Type J Type K Type L Type N Type R Type S Type T Au Pt Thermistors SOppm Thermocouples 0 23 C 0 03 C 0 04 C 0 05 C 0 04 C 0 06 C 0 17 C 0 19 C 0 05 C 0 12 C 150ppm 0 46 C 0 06 C 0 07 C 0 10 C 0 07 C 0 12 C 0 34 C 0 38 C 0 09 C 0 23 C Resolution ff Resistance PRTs 0 00001Q Thermistors 0 001Q Voltage 0 00001mV Current 0 001mA Temperature 0 0001 PRTs IEC6075 1 2008 Callendar van Dusen ITS90 Thermocouples IEC584 1 1995 B E J K N R S T L Au Pt Thermistors Steinhart Hart polynomial Sensor Currents f SPRTs PRTs ImA and 1 428mA 0 4 reversing
36. ally from Farnell Electronics and can be ordered via their website www farnell com Farnell stock code 3817325 The pin out of the Lemo connectors looking into the milliK is RESERVED DG RESERVED Q H OY The polarity of the miniature thermocouple connectors is generally marked on the plugs fitted to the thermocouple the wider pin is the negative connection Channel 3 on the rear of the milliK is intended for connection to 4 20mA transmitters and uses 4mm sockets 4 1 Connecting PRTs SPRTs to millik Most PRTs SPRTs are supplied with a 4 wire connection so as to eliminate the effect of cable resistance on the measurement see section 3 1 3 Connect the wires as shown if the cable is screened ensure that it is connected to the body of the Lemo connector Isothermal Technology Page 53 of 101 923 milliK Issue 1 05 PRT SPRT If the PRT is supplied with only a 2 wire connection convert from 4 wire to 2 wire connection as close to the PRT as possible PRT SPRT If the PRT is supplied with a 3 wire connection the current and common wires should be of the same resistance of same length and gauge and connected directly to I and I pins 2 and 3 and a link that carries no current should be made from pin to pin 2 see section 3 1 3 PRT SPRT 4 2 Connecting Thermistors to millik High accuracy thermistor based thermometers are typically supplied with screened 4 wire cables The rel
37. ample a milliK set to measure channel on the next measurement will respond to SENS CHAN with 1 8 6 10 Command SENSe RESistance RANGe UPPer Format SENSe RESistance RANGe UPPer lt range gt Sets the lt range gt for the next resistance measurement The 3 resistance ranges available with the milliK are resistance range 0 115Q resistance range 0 460Q resistance range 0 500kKQ The resistance range specified should be the highest resistance expected for the thermometer Example to set the milliK to measure a PRT that has a resistance of 390Q at its highest operating temperature use SENS RANG 390 8 6 11 Command SENSe RESistance RANGe UPPer Format SENSe RESistance RANGe UPPer Reports the range for the next resistance measurement Example a milliK that has had its resistance range set to 390Q using the command shown in section 8 6 10 would respond to the command SENS RANG with 460 since this is the most sensitive range that can accommodate the requested range Isothermal Technology Page 88 of 101 923 milliK Issue 1 05 _ISOT CH _ 8 6 12 Command SENSe RESistance WIRes Format SENSe RESistance WIRes lt wires gt Determines whether the next resistance measurement will be made using 3 or 4 wire resistance measurement technique see section 3 1 3 for details on 3 and 4 wire measurements The parameter lt wires gt must be 3 or 4 otherwise the command will be ig
38. an Community Low Voltage Directive 93 68 10 2FCC Statement This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area may cause harmful interference in which case the user will be required to correct the interference at his own expense Changes or modifications to this equipment not expressly approved by Isothermal Technology could degrade EMC performance and void the user s authority to operate the equipment Isothermal Technology Page 99 of 101 923 milliK Issue 1 05 _ISOT CH _ 10 3Standards Applied The following standards have been applied in assessing compatibility with the requirements for CE marking and for FCC compliance Conducted Emissions EN61326 2006 amp CFR47 2009 Radiated Emissions EN61326 2006 amp CFR47 2009 Conducted Immunity EN61326 2006 Radiated Immunity EN61326 2006 Electrical Fast Transients EN61326 2006 Electrostatic Discharge EN61326 2006 Surge EN61326 2006 Voltage Dips amp Interruptions EN61326 2006 Harmonic Currents EN61000 3 2 2
39. ata from within the or Windows by using the keys to select the SEURE SKJALG button and then pressing the key Isothermal Technology Page 34 of 101 923 milliK Issue 1 05 100 001 0 7 Q 100 0014 100 0012 100 001 100 0008 3300 3600 3 00 36800 S900 4000 Numeric Settings Instrument This opens the File Location Window File Location 749 94 ME 1 89 GB 36 68 weeks Q4 67 weeks Use the keys to select whether to store the file to external or internal memory and then press the OK F4 or keys to open a soft keyboard and enter a filename a default filename generated from the date time is suggested automatically Please enter a filename mali 20110401_ 1128 space Caps Lock Backspace Isothermal Technology Page 35 of 101 923 milliK Issue 1 05 _ISOT CH _ 3 8 1 Transferring Logged Data to a PC To transfer data logged data to an external USB drive to a PC stop the logging DO NOT remove the USB drive while still logging data to it as the data on the drive may then not be accessible and transfer the drive to your PC The file will be located in the root directory of the drive To transfer data logged to the milliK s internal memory to a PC it must first be transferred to a USB drive Plug the USB drive into the USB port on the rear of the milliK Press the Instrument F4 key use the keys to select and then press the key All files in the milliK s internal memor
40. ation Reference Measurement Cu Junction M Junction Cu Ice Point When using a thermocouple with the reference junction in an ice point the Reference parameter in the Window should be set to 0 C see section 3 3 4 Also you Isothermal Technology Page 27 of 101 923 milliK Issue 1 05 _ISOT CH MUST use a copper miniature thermocouple connector in order to avoid introducing unwanted additional thermal EMEs 3 3 4 Configuring milliK to Measure a Thermocouple The milliK can be used with both calibrated and uncalibrated thermocouples Press the Settings F3 key to access the Settings Window which opens with the Channel parameter selected Use the keys to select the channel that you want to use Then use the keys to select each parameter in turn and set it to the required value either by using the keys to sequence through the options or pressing the key to open a new Window with all the options listed For an uncalibrated thermocouple or one that is not supplied with calibration data set Thermometer to Default Thermocouple If you want to use temperature units select one of the standard conversions for thermocouples If your thermocouple is supplied with calibration data data pairs of polynomial coefficients you can create a thermometer entry in the database see section 3 9 5 that uses this data to provide more accurate conversion of the measured EMF to temperature A
41. atively high resistance of thermistors makes them more susceptible to external noise so it is important to connect the cable screen if provided to the body of the Lemo connector Isothermal Technology Page 54 of 101 923 milliK Issue 1 05 _ISOT CH _ Use the same 4 wire connection as is employed with PRTs so as to eliminate the effect of cable resistance on the measurement THERMISTOR The relatively high resistance of thermistors means that they are used with much lower sense currents 2uA on milliK than PRTs SPRT and the effect of the cable resistance is much lower Thermistors are therefore sometimes supplied with only 2 wire connections in which case they can be connected to the milliK as follows THERMISTOR 4 3 Connecting Thermocouples to millik In order to connect thermocouples to your milliK fit a suitable miniature thermocouple plug conforming to ASTM 1684 05 and connect it to one of the thermocouple sockets on the front panel The plug should be a copper type contacts made of copper if using a thermocouple with an accessible reference junction that is measured by a separate thermometer external compensation or in an ice point 0 C reference junction temperature If you wish to use internal reference junction compensation fit a thermocouple plug that matches the thermocouple type contacts made of the same metal alloy used in making the thermocouple the reference junction is then formed inside the c
42. can optionally supply thermometers fitted with a suitable Lemo connector Your milliK is supplied with two Lemo connectors for you to use with your own PRT SPRT or thermistor The part number for this connector is Lemo part number FGG 1B 306 CLAD62Z Additional connectors are readily available internationally from Farnell Electronics and can be ordered via their website www farnell com Farnell stock code 3817325 Channels 1 and 2 are not isolated from each other but are isolated from Channel 3 and from the digital interfaces in order to optimise immunity to external noise sources Isothermal Technology Page 18 of 101 923 milliK Issue 1 05 _ISOT CH _ 3 1 1 Configuring milliK to measure a PRT SPRT Press the Settings F3 key to access the Window which opens with the Channel parameter selected Use the keys to select the channel that you want to configure Then use the keys to select each parameter in turn and set it to the required value either by using the keys to sequence through the options or pressing the 4 key to open a new Window with all the options listed A typical configuration for an uncalibrated PRT would be Channel Channel 1 Status Thermometer Type Conversion IEC60751 2008 Range Units current ned O Oooo o Readings in Stats Numeric Settings Instrument Range would normally be set to 460Q for a 100Q PRT and to 115 Q for a 25 5 Q SPRT see section 3 1 Most PRT SPRT meas
43. cccceeccceeeeeeeneeeeeeneeees 21 3 1 3 Using 3 or 4 Wire MeaSUremMe it sess crisiecicriacanserincathentetesverlveevnoreieeserleewiherioes 21 3 2 Using a Thermistor with mill K sicsccsicdeseavnsercosencdsacasseaaeswesdenedeasanseawaecveeaveeacseussets 23 3 2 1 Configuring milliK to Measure Temperature with a Thermistor 24 3 3 Using a Thermocouple with milliK 2 0 0 cece csecccceseceeeeeceeeceeaeseeseeeeeeeseeseeeeees 25 3 3 1 Using Internal Reference Junction Compensation c cccseecccseeeeeeeeeeeeees 26 3 3 2 Using External Reference Junction Compensation cccceccccseseeeeeeeeeeees 26 3 3 3 Using an Ice Point for the Reference JUNCTION cece ceeccceeeeeceeeeeeeeeeeneees 2i 3 3 4 Configuring milliK to Measure a Thermocouple cccccseseecseseeeeeeeeneees 28 3 4 Using a4 20mA Transmitter with milliK cc ecccceeeeceeseeeeeeeeeeeeeeeeseeseeeens 30 3 4 1 Configuring milliK to Measure a 4 20mA Transmitter ce ccceeeeeeeeeees 31 3 5 Measuring the Difference Between Two Channels cccecccceeeecseeeeeeeeeeneseees 32 30 Chn me Gropi S alo ene O TE T 32 37 Using ROMA StatistiCSsersisisracsetnisisra re nnr sarea r ENTEN a EREE ATERS aaA PERAE ESERSE 33 28 Lotting CSUs toa Tile soseer EA ENEE 34 3 8 1 Transferring Logged Data to a PC eccccecccceseceeeeeeeseeeeneeeseeeeeeneeeeeens 36 3 8 2 Pile Format for Logged Data smsicssriecsiicic rsrs aedis 36 3 8 3 C
44. ce liquid filled containers on the equipment Do not use where the equipment or any associated accessories may be subjected to dripping or splashing liquids Ensure all cables and wires are routed safely to avoid tripping also to avoid sharp bends and pinches Clean only with a damp cloth Do not wet or allow moisture to penetrate the equipment Do not use solvents see section 6 for details of cleaning procedure The product should be subjected to regular in service inspections as required by local regulations a yearly interval is suggested Do not apply earth test currents to any terminals nor to the shrouds of the USB RS232 or Ethernet connectors The product is designed to comply with EN 61010 1 and can be flash tested It is fitted with radio frequency interference suppressors Therefore it is recommended that only a D C test be performed Performing flash tests repeatedly can damage insulation This equipment contains no user serviceable parts Refer all repairs to qualified service personnel Contact Isothermal Technology or one of our appointed distributors for details of approved service outlets The power supply has been approved to the following safety standards Isothermal Technology Page 6 of 101 923 milliK Issue 1 05 _ISOT CH UL60950 1 2 Edition 2007 03 27 CSA C22 2 No 60950 1 07 2 Edition 2007 03 EN 60950 1 2006 including A11 BS EN60950 1 2006 AS NZS60950 1 2003 including amendm
45. dicated at zero OQ and approximately full scale 100Q and 400Q on both channels 5 2 1 1 PRT SPRT Resistance Range Zero Check The current reversal employed by the milliK eliminates the effect of thermal EMFs and provides an inherently stable zero for resistance measurement There is therefore no zero adjustment for resistance and the zero check is only used to confirm correct operation of the milliK Apply a 4 terminal short circuit see section 5 1 1 to channel 1 and set the milliK to read its resistance on the 115Q range at 1mA by changing the parameters in the Window Channel Channel 1 Status Thermometer Default 4 wire PRT Type conversion Range Units current Samples Reading Readings in Stats Numeric Settings Instrument Next press the TWIG F2 key clear the statistics and wait for 100 measurements to be made when the display shows Mean of 100 The specification states that the accuracy across the range should be within 7ppm of range which equates to 0 000800 however this zero reading should be lt 0 00010Q After checking the zero ohm reading on channel 1 repeat the measurement on channel 2 There is no adjustment possible for zero resistance Isothermal Technology Page 60 of 101 923 milliK Issue 1 05 _ISOT CH readings so if the zero readings fall outside the limits you should return your milliK to Isotech for investigation 5 2 1 2 SPRT Resistance Range 115Q Span Chec
46. e Zero and Span Check Set the milliK to read the current on channel 3 by changing the parameters in the Settings Window Isothermal Technology Page 63 of 101 923 milliK Issue 1 05 Channel Channel 3 Status Thermometer Type 4 20m Conversion Mone Range Units SamplesReading oS Readings n Stas 00o Numeric Settings Instrument Press the TYE F1 key select channel 3 clear the statistics and wait for 100 measurements to be made when the display shows Mean of 100 The mean value indicated by the milliK is the zero reading for current measurements Connect a calibrated nominally 1OmA current source to channel 3 rear panel Toma Calibrated Current Source Clear the statistics and wait for 100 measurements to be made The measurement system 1s very low noise so it is likely that you will see the readings dithering between 2 values separated by the milliK s current resolution lt 0 001mA The mean value indicated by the milliK should be compared with the current source s calibrated value 5 2 6 Reference Junction Compensation Accuracy Check the accuracy of the internal reference junction compensation RJC system by connecting a thermocouple to the milliK and measuring a know temperature using internal RJC mode Any discrepancy between the measured and known temperature indicates an error in the RJC system or the thermocouple used You can use any thermocouple type for the measuremen
47. e Calibration Menu Window use the keys to select 460Q Range and then press the M key to proceed to the 460Q Calibration Adjustment Window and use the same procedure described for calibrating the 11502 range see section 5 3 2 to adjust this range 5 3 4 Adjusting Thermistor 500kQ Resistance Range Connect a calibrated nominally 500kQ resistor to channel 1 In the Calibration Menu Window use the keys to select 500kQ Range and then press the key to proceed to Isothermal Technology Page 68 of 101 923 milliK Issue 1 05 _ISOT CH the 500kQ Calibration Adjustment Window and use the same procedure described for calibrating the 11502 range see section 5 3 2 to adjust this range 5 3 5 Adjusting Zero Voltage Offsets Connect a OmV short circuit see section 5 1 2 to the miniature thermocouple connector for channel 1 In the Calibration Menu Window use the keys to select OmV Range and then press the M key to proceed to the OmV Calibration Adjustment Window Use the keys to select channel 1 Om Range Calibration Adjustment Channel 1 Please ensure that nothing is connected to the seleted channel then press OK to adjust calibration Once the calibration has completed please run the 115m calibration Press the J4 F4 key to start the calibration adjustment Once started the calibration adjustment process cannot be aborted Repeat the procedure on Channe
48. e Start F4 key at the opening screen the operator interface will then not request measurements allowing faster measurements via the RS232 interface You can connect an Isotech temperature source to either of the COM port and use the milliK to control the source and make measurements under the control of the milliKs internal software This provides a very effective and simple automatic calibration system The milliK automatically detects when a COM port is connected to a temperature source allowing the ports to configure themselves and making the two RS232 ports totally interchangeable the user can use either port interchangeably The command set uses the SCPI Standard Commands for Programmable Instruments protocol see section 8 6 4 for details Isothermal Technology Page 75 of 101 923 milliK Issue 1 05 _ISOT CH _ 7 1 1 Establishing an RS232 Connection The RS232 connectors are located on the rear of your milliK see section 2 1 The connectors are 9 way male D types configured as standard DTE devices Pin Name Function 1 CD carrier detect not connected 2 RD _ receive data 3 TD transmit data 4 DTR data terminal ready fixed high 5 SG signal ground 6 DSR data set ready not connected 7 RTS request to send 3 CTS clear to send 9 not used not connected Shell FG frame ground screen Connect your milliK to a PC using the null modem RS232 cable supplied If you wish to make your own cable use the foll
49. e the keys to select the required profile or select None to disable sequencing of the temperature set point then press the OK F4 key If the profile has been configured to start Immediately then when you press the OK F4 key the first set point will be sent to the temperature source Otherwise if the profile has been configured to start On Save the first Isothermal Technology Page 50 of 101 923 milliK Issue 1 05 _ISOT CH set point will be sent when you start logging data When a profile has started the current set point and duration will be shown in the Setpoint Status box Channel Status Thermometer Type Conversion Range Units Reference Junction samples Reading Readings in Stats 100 Setpoint Temp PRT Cal 0 200C Setpoint Status Step 1 of 2 for 30 min at 50 C Numeric Settings Instrument 3 12 1 Creating a Temperature Profile The milliK allows you to define temperature profiles and store these in a database To create a new profile press the Instrument F4 key use the keys to select SOJA and then press the key to open the Temperature Profile Menu Window you will need to enter the password to access this Window Please Select Create Hew Profile Edit Existing Profile Remove Profile Use the keys to select whether you wish to create edit or delete a profile and then press the M key to open the Temperature Profile Window Isothermal Technology
50. ectors Lemo 6 pin circular connectors for SPRTs PRTs thermistors and miniature thermocouple connectors for channels and 2 On the rear of your milliK you will find the 4mm sockets for channel 3 used exclusively for 4 20mA transmitters Colour Up Down On Off LCD Left Right Button Enter keys Tilt Channel 1 Channel 2 Feet Lemo Lemo Connector Connector Channel 1 Channel 2 Context Miniature Miniature Sensitive Thermocouple Thermocouple Function Connector Connector Keys Isothermal Technology Page 9 of 01 923 milliK Issue 1 05 DC Battery Paw Compartment Input sothermal Technology Limited Ni MK Alkaline or Lithium pP gt Southport i trecision Thermometer Merseyside PRS SAG Manufactured in the UK S Serial No CH 3 4 20mA Input Ethernet USB2 0 RS232 DC Power _ gt Active e X sen 4 15V DC Passive LOD 4 15V SV DC RTR ar CoM 2 1 6A Max 4mm RS232 Sockets for Connector Channel3 COM2 4 20mA RJ45 RS232 Ethernet Connector Connector COM1 USB Host Connector The milliK is controlled using the left right up down enter key cluster and the 4 function keys located below the display The keys are used to navigate between items on the screen and the Mf key is used to select or toggle the highlighted item The function keys select the context sensitive function displayed above each key The milliK will display soft keyboards when required so that all features of the mil
51. ence between any channel and channel 1 provided that the units are the same otherwise the value would be meaningless This feature is available in both the or Windows where the differential option is listed amongst the other single channels on the button or in the channels list that open when this button is selected If the units for a channel differ from those of channel 1 the differential option will not be listed 3 6 Changing Graph Scales The scales of the graph used to display measurements in the Window can be set manually or automatically adjusts vertical scale to ensure that all available data 1s visible Press the Graph F1 key to open the Window use the keys to select the SAREES button and press the key to open the Set Graph Scales Window Isothermal Technology Page 32 of 101 923 milliK Issue 1 05 Set Graph Scales AAHS Y AXIS Minutes Minimum Maximum Auto Cancel Use the keys to select the required parameter and then press the key open a soft numeric keypad to change the value setting Please enter the 4xis scale in minutes Cancel When the Automatic Manual button is set to Automatic the buttons to change the y axis minimum and maximum values are disabled and cannot be selected Change this to Manual in order to access these parameters by selecting the Automatic Manual button and pressing the Bl key 3 7 Using Rolling Statistics The milliK reports the
52. ents 1 2 and 3 Isothermal Technology Page 7 of 01 923 milliK Issue 1 05 _ISOT CH _ 2 Getting Started The power supply operates from any standard AC electrical supply 90 264V RMS at 47 63Hz so unless your supply is unusual you can simply connect the power supply to a suitable electrical outlet The power supply is fitted with a standard BS 1363 plug head but is provided with alternative heads that cover the majority of electrical sockets used worldwide If you need to connect to an outlet socket that is not supported by the plug heads provided you should source a suitable electrical supply lead locally that is fitted with a C8 connector you can then plug this directly into the C8 socket on the power supply The plug head can easily be changed WARNING K Please don t insert article alone at the wall Isothermal Technology Page 8 of 101 923 milliK Issue 1 05 Plug the DC connector from the power supply into the DC Power socket on the rear of the milliK Press the on off button on the front panel to turn on your milliK The milliK will load the operating system and software 15s and then restore itself to the settings used when it was de powered This manual provides comprehensive details on using your milliK in addition video tutorials are available on the Isotech website see www isotech co uk video library php 2 1 A Quick Tour of Your millik On the front of your milliK you will find two sets of conn
53. er measurements take some time to complete so there may be a delay in responses to SCPI commands 1f measurements are being made via the front panel operator interface To avoid unnecessary delays to responses to SCPI commands you can stop all measurements requested via the front panel operator interface To do this restart the milliK but do not press the SAR F4 key in the opening window The main application that provides the user interface will then not start and no measurements will be requested Isothermal Technology Page 82 of 101 923 milliK Issue 1 05 _ISOT CH _ 8 6 1 Measuring Resistance using SCPI Commands In order to measure the resistance of a PRT you need to So gt select the measurement channel set the milliK to measure resistance select the measurement range set the sense current normal or root2 current select 3 or 4 wire measurement make the measurement and collect the result To use channel 1 to make a 4 wire resistance measurement on a 25 5Q SPRT up toa maximum resistance of 80Q using the normal 1mA sense current send the following command sequence SENS CHAN 1 SENS FUNC RES SENS WIR 4 SENS RES RANG 80 CURR NORM READ The milliK will then report the measured resistance for example 2 52506378E001 Send READ to make subsequent measurement using the same settings The following command performs the same measurement MEAS RES1 80 NORM 4 8 6 2 Measuring Voltage u
54. ery small lt 3 C so any error resulting from imperfections in the thermocouple will also be small You need to ensure that the thermocouple is at the same temperature as the PRT You can create an adequate isothermal environment using a stainless steel vacuum flask filled with silicone oil and agitated with a small air pump of the type designed to aerate fish tanks Clip the thermocouple to the PRT such that the junction is near to the sensing element in the PRT perhaps 1 2cm from the end with nylon cable ties and immerse the assembly in the oil Repeat the procedure on Channel 2 Isothermal Technology Page 65 of 101 923 milliK Issue 1 05 _ISOT CH _ 5 3 Adjusting the Calibration It is common good practice to check the calibration of an instrument before making any adjustment see section 5 2 for information on checking the calibration of your milliK After adjusting the calibration of your milliK its calibration should again be checked and the values used to generate a report on its post adjustment calibration The frequency of calibration is for the user to determine but Isotech recommend that you calibrate your milliK on an annual basis the specification for the milliK is given in terms of an initial calibration and additional uncertainty over a year period The values used to adjust the calibration together with information on the standards used and the calibration conditions are all stored in a comma separated CSV
55. esistors used should be either a Wilkins resistance standard or a high stability foil resistor such as a hermetically sealed Vishay Z foil resistor or the H series for the 10Q resistor The resistors should be maintained in a stable temperature environment such as a silicone oil bath whose temperature is near to the resistor s calibration temperature and that is monitored so that compensation can be applied for its temperature coefficient of resistance TCR 5 1 1 Making a 4 Terminal Short Circuit A 4 terminal short circuit is a connection that measures as OQ when measured as a 4 terminal resistance It can be fabricated using standard copper wire by shorting together the current connections and the voltage connections separately and then linking together these two short circuits with a single connection Isothermal Technology Page 58 of 101 923 milliK Issue 1 05 It is important that none of the current flowing between I and I flows along the short circuit between V and V There should only be a single link between the voltage and current circuits as shown 5 1 2 Making a OmV Source in a Thermocouple Connector A OmV source is essentially a piece of copper wire that can be connected across the thermocouples inputs of the milliK However you need to take care in making this short circuit in order to avoid creating thermal EMFs that are significant for an instrument as sensitive as the milliK The best method for m
56. gt used for current measurements Gains outside the range 0 98 to 1 02 are ignored The optional lt standard gt parameter is a string that is stored in the calibration database file which can be exported to a USB flash drive see section 5 4 to provide information about this calibration Typically it would be used to identify the serial number of the standard used Example for a milliK that has been found to require a current gain of 1 001234 by using a reference standard with serial number xyz1956 the gain can be set using CAL CURR GAIN 1 001234 SN_xyz1956 or CAL VOLT GAIN 1 001234 8 6 33 Command CALibrate CURRent GAIN Format CALibrate CURRent GAIN Reports the current measurement gain Example a milliK with a current gain set to 1 001234 will respond to CAL CURR GAIN with 1 001234 8 6 34 Command CALibrate RJC OFFSet Format CALibrate RJC OFFSet lt offset gt lt TC type gt lt serial gt lt info gt Sets the lt offset gt in C added to measurements of thermocouple reference junction temperatures Offsets outside the range 10 C are ignored The optional parameters are strings that are stored in the calibration database file which can be exported to a USB flash drive see section 5 4 to provide information about this calibration Typically these would be used to store information on the thermocouple type used in the calibration the serial number of this thermocouple and additional information such a
57. gy Page 74 of 101 923 milliK Issue 1 05 _ISOT CH _ 7 Interfacing with milliK The milliK is equipped with two RS232 ports and an Ethernet port that allow you to control its operation remotely including control via Isotech s Cal Notepad software see section 8 6 3 The USB host port can be used to attach devices such as a mouse keyboard or keypad to provide alternative means of driving the milliK using its user interface You can attach a USB hub if you wish to use more than one USB device 7 1 RS232 Interface The milliK s RS232 interfaces can be used to control the milliK perform calibration and diagnostic functions and to connect to and control one of Isotech s temperature sources You can connect and send commands to either or both COM ports A typical arrangement would be to connect a PC to one COM port and control the instrument using software running on that PC The milliK treats the two COM ports as separate input streams so that they do not interact with each other If you were to connect separate PCs to the two COM ports then measurements made by software running on one PC would not affect measurement made by the other PC There is of course only one measurement system that is being shared between the COM ports and the front panel operator interface so any measurements made by one of these will slow down measurements made by any other If you wish to control the milliK using the RS232 interface alone do not press th
58. hermal Technology Page 48 of 101 923 milliK Issue 1 05 _ISOT CH _ 3 11 1 Recovering a Lost Password Passwords are encrypted before being stored in the milliK so it is not possible to recover a lost password If a password is lost you can get a temporary password from Isotech that will allow you to change the password to a new one This temporary password can only be generated from a password recovery key generate by your milliK Isotech cannot supply a universal recovery password If you lose your password go to the Change Password Window see section 3 11 and press the F2 key not labelled on screen the milliK will then generate the recovery key Change Password Temp Password New password Confirm password Please call Isothermal Technology and quote the password recovery key below You will then be given a temporary password which you should enter agge Key ad414ate Email this recovery key to Isotech and we will send you a temporary password to enable you to change the password to a new value Enter this temporary password as the Old Password in the Change Password Window Once you have changed the password the temporary password will no longer work if you forget your password again repeat the above procedure 3 12Controlling Temperature Sources with millik The milliK can control an Isotech temperature source changing the set point at user defined intervals whilst monitoring thermometers in o
59. iew the measurements 2 Clear Set Start Channel 1 Graph Scales Save C Isothermal Technology Page 20 of 101 923 milliK Issue 1 05 _ISOT CH _ Use the keys to navigate between and select the on screen buttons to selecte the channel clear the graph clear the statistics Numeric Window set the scales or start stop logging of data to a file 3 1 2 Determining Self Heating of a PRT SPRT The normal sense current used by the milliK for PRTs SPRTs is 1mA This current causes a small amount of self heating in the thermometer typically 1 to 3mK Provided that the thermometer is calibrated and used at the same current this leads to negligible uncertainty in the measurement In some special applications the self heating effect is a significant source of measurement uncertainty and it may be necessary to determine the amount of self heating in the thermometer This is easily achieved by varying the sense current and observing the change in indicated temperature The milliK provides a feature that allows the sense current to be increase by a factor of 1 428 V2 mA which increases the power dissipated by a factor of two since power is proportional to current squared The change in indicated reading caused by this change is then a direct measure of the self heating effect at the normal 1mA sense current if the self heating effect at 1mA is 5T then the self heating at 2 mA is 28T and the difference between the two readings i
60. inally 500kQ resistor to channel 1 and set the milliK to read its resistance on the 500kQ range by changing the parameters in the Settings Window Isothermal Technology Page 6l of 101 923 milliK Issue 1 05 Channel Channel 1 Status Enabled Thermometer Default Thermistor Type Conversion Range Units Current Samples Reading Readings in Stats Numeric Settings Instrument The high resistance used makes the input prone to picking up electrical interference so the connection to the resistor should ideally use screened cable see section 4 2 Press the OMAS F2 key clear the statistics and wait for 100 measurements to be made when the display shows Mean of 100 The mean value indicated by the milliK should be compared with the calibrated value of the resistor apply a correction to the value of the resistor if its temperature coefficient of resistance is significant Repeat the procedure on Channel 2 5 2 3 Thermocouple Voltage Range Zero Check Connect a OmV source see section 5 1 2 for details of how to make a OmV short circuit to channel 1 and set the milliK to read voltage by changing the parameters in the Settings Window Channel Channel 1 Status Thermometer Type Conversion Range Units i Reference Junction samples Reading Readings in Stats Numeric Settings Instrument Press the NTT F2 key clear the statistics and wait for 100 measurements to be made when the display
61. ing Readings in Stats Numeric Settings Instrument Once you have configured the milliK to work with your thermocouple press either the Graph F1 or Numeric F2 keys to view the measurements Isothermal Technology Page 29 of 101 923 milliK Issue 1 05 Settings Instrument Use the keys to select and activate the on screen buttons to select the channel clear the graph clear the statistics Numeric Window set the scales and start stop logging of data to a file 3 4 Using a 4 20mA Transmitter with millik The milliK can be used with 4 20mA temperature transmitters by using the 4mm sockets on the rear of the milliK designated Channel 3 The centre 4mm socket is the current sense input to the milliK the other 4mm sockets are OV and a 24V supply Connect the transmitter between the appropriate 4mm sockets depending on whether it is self powered or loop powered suitable for a 24V loop supply 4 20mA 4 20mA t Self Powered Transmitter Loop Powered Transmitter The 4 20mA system and 24V supply are isolated from both the measurement system of Channels and 2 and from the digital interfaces in order to optimise immunity to external common mode noise sources Isothermal Technology Page 30 of 101 923 milliK Issue 1 05 _ISOT CH _ 3 4 1 Configuring milliK to Measure a 4 20mA Transmitter The milliK can measure the current output from a 4 20mA transmitter or it can convert this current to temperature units
62. ings in Stats Single Settings Instrument From the Calibration Menu Window use the keys to select RJ Sensor and then press the fi key to proceed to the RJ Sensor Calibration Adjustment Window Use the keys Isothermal Technology Page 71 of 101 923 milliK Issue 1 05 _ISOT CH _ to select channel 1 and then use the keys to select each parameter in turn and press the key to enter their values FJ Sensor Calibration charnel 1 Attach a calibrated thermocouple to the selected channel Enter details for standards used and then press OK to adjust calibration known Temperature 20 123000 Thermocouple Type Thermocouple S M not applicable Additional Into wire has 5u at 20C Cancel Press the J F4 key to start the calibration adjustment Once started the calibration adjustment process cannot be aborted 5 4 Exporting Calibration information A calibration file containing the complete calibration history of the milliK in comma separated CSV form can be exported to a USB drive for transfer to a PC The file can be imported into Excel or other suitable applications for viewing To export the file connect a USB drive to the USB port on the rear of the milliK go to the Calibration Menu Window and press the SAYA F3 key Calibration Date 08 04 2011 Mame company Location Room TAC Cancel Export Isothermal Technology Page 72 of 101 923 milliK Issue 1 05
63. k Connect a calibrated nominally 100Q resistor to channel 1 and set the milliK to read its resistance on the 115Q range at ImA by changing the parameters in the Settings Window see section 5 2 1 1 for details of settings Press the Numeric F2 key clear the statistics and wait for 100 measurements to be made when the display shows Mean of 100 The mean value indicated by the milliK should be compared with the calibrated value of the resistor apply a correction to the value of the resistor if its temperature coefficient of resistance 1s significant Repeat the procedure on Channel 2 5 2 1 3 PRT Resistance Range 460Q Span Check Connect a calibrated nominally 400Q resistor to channel 1 and set the milliK to read its resistance on the 460Q range at ImA by changing the parameters in the Settings Window Channel Channel 1 Status Thermometer Type Conversion Range Units 1 Current SamplesfReading oS S Readings in Stats Murmer ic Instrument Press the TTY F2 key clear the statistics and wait for 100 measurements to be made when the display shows Mean of 100 The mean value indicated by the milliK should be compared with the calibrated value of the resistor apply a correction to the value of the resistor if its temperature coefficient of resistance is significant Repeat the procedure on Channel 2 5 2 2 Thermistor Resistance Range 500kQ Span Check Connect a calibrated nom
64. l 2 5 3 6 Adjusting Voltage Gain Connect a calibrated nominally 100mV signal to channel 1 see section 5 2 4 for information on generating a suitable signal In the Calibration Menu Window use the keys to select 115mV Range and then press the key to proceed to the 115mV Calibration Adjustment Window Use the keys to select channel 1 and then use the keys to select each parameter in turn and press the key to enter their values The Standard S N and Additional Info fields can be used to record information on the standard used If you generate the 100mV using a 10Q resistor with serial number 2791555 and a 10mA current source with serial number 2 M52 S52 suitable entries would be Isothermal Technology Page 69 of 101 923 milliK Issue 1 05 115m Range Calibration Adjustment Channel 1 Apply 100m to the selected channel 2 Enter details for standards used and then press OK to adjust calibration Voltage Applied imi 100 001213 Standard S M egl Additional Into eNWa2 S32 Press the J4 F4 key to start the calibration adjustment Once started the calibration adjustment process cannot be aborted 5 3 Adjusting 4 20mA Transmitter Range Connect a calibrated nominally 1OmA current source to the 4mm sockets designated channel 3 on the rear of the milliK Toma Calibrated Current Source In the Calibration Menu Window use the keys to select 4 20mA Range
65. lable Conversion options and the Coefficients used depends on the thermometer Type selected PRT Thermocouple Thermistor or 4 20mA Thermometer Type Available Conversion PRT None IEC60751 2008 Callendar Van Dusen ITS90 Thermocouple None Type Au Pt Type B Type E Type J Type K Type L Type N Type R Type S Type T Steinhart Hart Polynomial Linear Select the Conversion you wish to use with the thermometer then select Coefficients and press the key to enter view edit calibration coefficients A discussion of the various conversion coefficients and their application follows 3 9 2 Using a PRT with IEC60751 2008 Conversion The variation of resistance with temperature for platinum is well know and predictable The characteristics depend on a number of factors including the purity of the wire Higher purity platinum wire exhibits greater sensitivity more resistance change per C but is more susceptible to changes caused by contamination that can occur in use For this reason platinum wire with small amounts of intentional impurities an alloy is used for many industrial PRTs to make them more stable in use The most common grade of wire offers a sensitivity for a 100Q PRT Pt100 of 0 385 Q K at 0 C and has a typical generic resistance temperature characteristic that is defined in standard IEC60751 2008 You can use the generic IEC60751 2008 conversion with P
66. lable internationally from Farnell Electronics and can be ordered via their website www farnell com Farnell stock code 3817325 Channels 1 and 2 are not isolated from each other but are isolated from Channel 3 and from the digital interfaces in order to optimise immunity to external noise sources Isothermal Technology Page 23 of 101 923 milliK Issue 1 05 _ISOT CH _ 3 2 1 Configuring milliK to Measure Temperature with a Thermistor Firstly the thermistor and its calibration details must be entered into the milliK s thermometer database see section 3 9 1 the thermistor will then appear in the Thermometer list Press the Settings F3 key to access the Window which opens with the Channel parameter selected Use the keys to select the channel that you want to configure Then use the keys to select each parameter in turn and set it to the required value either by using the keys to sequence through the options or pressing the key to open a new Window with all the options listed A typical configuration for a thermistor would be Channel Channel 1 Status Thermometer Therm STHM100 Type Conversion Range SOOks Units current Samples Reading Readings in Stats Numeric Settings Instrument The Samples Reading parameter is the number of samples averaged together to form a single reading Increasing this value will reduce the noise on the measurements standard deviation will reduce as the square root
67. learing Logged Data from Internal Memory neseessensseesseessersssesssesseesse 37 39 Using the Thermometer Database sserscsssmosoisisirssitesissirssnrssi renien 38 3 9 1 Creatine a New Thermometer Entry oon ssccdscccssideensnabdoescnvndueresatdeeriaardecnasendeesiis 38 3 9 2 Using a PRT with IEC60751 2008 Conversion cece ceeeeecseeeeeeeeeeaeees 40 3 9 3 Using a PRT with Callendar Van Dusen Conversion cccccseeeeneeeeeeeeees 4 3 9 4 Using a PRT with ITS9O Conversion ccc ecccsescccsececeeseceeneccaeseeeenseeaeees 42 3 9 5 Using a Thermocouple with Calibration Coefficients Data Pairs 43 3 9 6 Using a Thermistor with the Steinhart Hart Polynomial cceecceeeeeees 44 3 9 7 Using a Thermistor with Polynomial Temperature Conversion 0006 45 3 9 8 Using a 4 20mA Transmitter with Linear Conversion cccseseeneeeeeeeees 46 3 10 RC ain TINS SO Wy AG E severe ae A E seen sence macnn eecne ca 47 3 11 Using and Changing Passwords ccccccsescceesecceeseceececeeseeseneeeeeseesseseenseesages 47 3 11 1 Recovering a Lost Password ccisaaesassetivesnensaeetodensvesnseen vameestvesedeswieedystvesodeee vies 49 IA Controlling Temperature Sources with miliK sssesesessseessersseessersssrsssesssesses 49 3 12 1 Creating a Temperature Profile vascdivcncacstsasiandisescaadttensandesaecenditenumettanaecdasnsinnens 51 A Connecting Thermometers to Titi Ks
68. liK can be accessed using these keys You can also connect a keyboard and or mouse to the USB port rear panel and use these to control the milliK The function keys below the display are mapped to keys F1 F4 on the keyboard The milliK is also equipped with two RS232 ports these are completely interchangeable a USB 2 0 host port and Ethernet port 10 100MBit available on the rear panel The milliK is primarily for use as a bench top laboratory standard but can also be powered from 4 x AA cells Ni MH Alkaline or Lithium if a suitable electrical supply is not available typical rechargeable Ni MH cells provide gt 4 hours operating life The battery compartment 1s located on the rear panel Isothermal Technology Page 10 of 101 923 milliK Issue 1 05 _ISOT CH _ 2 2 Driving your millik When the milliK is turned on the opening Window appears showing the configuration milik SM 10 P196 software version 1 3 6 Firmware wersion 1 07 miliskanners detected none Press the right hand function key below Start to proceed or connect a USB keyboard or mouse and press F4 or click SE The milliK software will then start and you will see the 100 001 02 Q2 main Windows 700 S00 620 840 S60 gS Numeric Settings Instrument There are four main Windows which can be selected using the function keys below the display The software always starts with the Window selected as shown above We will now provide a descriptio
69. ll be used to stamp subsequent calibrations Example a milliK that has been set to stamp calibrations using the information shown in section 8 6 36 would respond to CAL IDEN with JSmith sotech Primary Lab 19 20C 8 6 38 Command CALibrate IDENtification LAST Format CALibrate IDENtification LAST Reports the calibration information for the last calibration made to the milliK Example If the milliK had been calibrated by Joe Bloggs of Metrosol in their secondary laboratory at 20 C 2 C and had not had any calibration adjustment applied since it might respond to CAL IDEN with JBloggs Metrosol Main_Lab 18 22C Isothermal Technology Page 96 of 101 923 milliK Issue 1 05 _ISOT CH _ 8 6 39 Command CALibrate PASSword Format CALibrate PASSword lt old password gt lt password gt lt password gt Changes the password used to lock protect the calibration of the milli1K s measurement system This is initially set to 1234 but should be changed before using the milliK for any critical or traceable measurement or calibration work The new password must be at least 4 characters in length and must be typed in identically twice in order to effect the change Example to change the password from 1234 to ABCD use CAL PASS 1234 ABCD ABCD 8 6 40 Command CALibrate VALid Format CALibrate VALid Reports whether the calibration information loaded from the milliK s database is valid If it is not v
70. ly immune to the resistance of the wires The common and current leads should be cut to the same length and connected directly to pins 2 and 3 and a link wire carrying no current should be used to link pin 1 to 2 in order to minimise uncertainty due to the limitations of 3 wire measurement inequalities in the wire resistance If you wish to make temporary connections to a 3 wire PRT using intermediate connectors typically required for calibrating 3 wire PRTs then you must ensure that the resistance in the extension connections to the I and I wires is the same Connectors This can be achieved by using the same gauge and length of wire for the I and I leads Use the lowest resistance wire that is mechanically suitable so as to minimise the resistance of Isothermal Technology Page 22 of 101 923 milliK Issue 1 05 _ISOT CH _ the extension connections and therefore minimise any error from the imbalance in their resistance 3 2 Using a Thermistor with millik The milliK can be used with resistance thermometers based on thermistors These are typically NTC negative temperature coefficient devices which have well defined characteristics and can offer accuracies down to 25mK or less Compared with PRTs SPRTs thermistors have a much higher resistance typically measured in tens of KQ operate over a more limited temperature range typically lt 150 C are highly non linear but they are lower cost and can be more robu
71. milli User Maintenance Manual Handbook Issue 1 05 Software version 3 6 Firmware version 07 Isothermal Technology Limited Pine Grove Southport PR9 9AG England Tel 44 0 1704 543830 Fax 44 0 1704 544799 Internet www isotech co uk E mail info isotech co uk The company is always willing to give technical advice and assistance where appropriate Equally because of the programme of continual development and improvement we reserve the right to amend or alter characteristics and design without prior notice This publication is for information only Isothermal Technology Page of IOI 923 milliK Issue 1 05 _ISOT CH _ Contents MVOC TIO ease scresip es E E E 5 EE UDICE AE A 5 E E EEA E E A T T ET TTO 5 2 U S e E E 8 214 A Quick Tourof Your millik ii cipccusetre tetas tees ie ees ete eae eee es 9 2 2 Driving your milliK 5d onrahednncczasdsmnsahedaaestnedenmnthedaeantnedevesitnedslaundnedenesaiadphundnadenestnetews 11 221 The Gropi Wido geen e E ETES 12 A T Numere NON a E 12 229 NG o aS NO a E EE 13 224A ITN listrumnmen Window ieee meee intari ee re ner et EOR ESE 15 pe BEN OP O e E T E E nen reer et errs 17 3 Detailed Description by Function esseessessessseessersserssersssrsssrsssesseesseesssessserssersseres 18 out Usm PRI SPRE Witla ai E esre E OEE OEREN EEE 18 3 1 1 Configuring milliK to measure a PRT SPRT cc cceeccccseeeeceeeeeeeneeees 19 3 1 2 Determining Self Heating of a PRT SPRT ee
72. n and standard deviations Channels that are not enabled in the Window do not appear You can choose whether to view a single channel with a large font or all the channels with a smaller font using the SINGAT PILETA button If you choose to view a single channel then the base units for the thermometer will be displayed at the same time 0 002 88 U Q00 13 a oe Ke am an Std Dey Settings Instrument Isothermal Technology Page 2 of 101 923 milliK Issue 1 05 7 All Clear hannel 1 ae Channels Eerie i 00026 oc 00285 0 000 15 2 o 0os4 Cc joool 0 000 28 0 0079 fc o 00805 jo 000 21 Settings Instrument Functions available from within this Window are Select which channel or the difference between which channel and channel 1 to view Select whether to display a single channel or all channels Clear the rolling statistics and reset the statistics counter Start stop logging of data to internal or external USB drive memory Use the keys to select from the buttons displayed at the top of the screen and press the key to activate that function for example to clear the statistics 2 2 3 The Settings Window In the Settings window you can change the settings for each measurement channel Channel Channel 1 Status Thermameter Type Conversion Range Unit Current Samples Reading Readings in Stats Umer ic Settings Instrument Use the keys to select the setting you
73. n of each Window If you wish to perform a particular function for example changing the time date then you can find help on this by locating it in the table of contents at the start of this manual and going straight to the relevant section Isothermal Technology Page of 101 923 milliK Issue 1 05 _ISOT CH 2 2 1 The Graph Window In the window you can view a single channel or the difference between any channel and Channel 1 in graphical and numerical form Functions available from within this Window are Select which channel or the difference between which channel and channel 1 to view Clear the graph Set the scales for the graph automatic scaling available for vertical axis Start stop logging of data to internal or external USB drive memory Use the keys to select from the buttons displayed at the top of the screen and press the key to activate that function for example to clear the statistics To change which channel is displayed or to select a difference use the keys to select the right hand button and either use the PAJ keys to sequence through the channels or press the key to open a Window containing a list of all the available channels Only channels that are enabled in the Settings Window appear so if only one channel is enabled this button has no effect 2 2 2 The Numeric Window In the window you can view enabled channels in numeric form together with their mea
74. nce GAIN Format CALibrate RESistance GAIN lt range gt lt current gt Reports the resistance measurement gain for the specified resistance lt range gt and lt current gt The lt current gt can be specified as either NORMal or ROOT2 The milliK will accept gains for the thermistor range 500kQ with root2 current but this is not used thermistors measurements are always made with a 2uA sense current Example to read the resistance gain for the 115Q range with normal 1mA sense current use CAL RES GAIN 115 NORM 8 6 28 Command CALibrate VOLTage OFFSet lt channel gt Format CALibrate VOLTage OFFSet lt channel gt lt offset gt Sets the lt offset gt added to voltage measurements made on lt channel gt The default units for the offset are milli volts Offsets outside the range 10uV are ignored Example to apply add an offset of 2uV 0 002mV to voltage measurements made on channel 1 you can use CAL VOLT OFFS1 0 002 or CAL VOLT OFFS1 2uV Isothermal Technology Page 93 of 101 923 milliK Issue 1 05 _ISOT CH _ 8 6 29 Command CALibrate VOLTage OFFset lt channel gt Format CALibrate VOLTage OFFSet lt channel gt Reports the lt offset gt added to voltage measurements made on lt channel gt in volts Example a milliK with a luV offset added to voltage measurement made on channel 1 will respond to CAL VOLT OFFS1 with 0 00000100 8 6 30 Command CALibrate VOLTage GAIN Format C
75. nce junction using a thermometer connected to another channel This technique can provide better measurement uncertainty than using internal reference junction compensation see section 3 3 1 provided that the reference junction and sensing thermometer are adequately isothermal and that the reference junction thermometer is sufficiently accurate Isothermal Technology Page 26 of 101 923 milliK Issue 1 05 _ISOT CH _ Channel A Channel B Reference Junction Junction 7M lsothermal Environment When using a thermocouple with external reference junction compensation the Reference parameter in the Window should be set to the channel used to measure the reference junction see section 3 3 4 Also you MUST use a copper miniature thermocouple connector in order to avoid introducing unwanted additional thermal EMFs Only channels configured to measure temperature i e having a Conversion defined appear in the Reference parameter list Thermocouple channels do not appear in the Reference parameter list in order to avoid circular dependencies For greater accuracy you can immerse the reference junction in an ice point at 0 C see section 3 3 3 3 3 3 Using an Ice Point for the Reference Junction The best measurement uncertainty is generally achieved by immersing the reference junction in an ice point and measuring the EMF it generates Isotech can provide ice point reference systems for this applic
76. nction n a fa a Samples per Readins tf o a O1 Seade nses L SS a a 4 Wire ie 4 Wire m 0 200C 4 20 TX wee C a 4 20mA Manufacturer sd ai 4 Wire avi 4 Wire ar Serial Number Number Minimum Temperature zas O nas 0 Co T C ee StartDate f o 15052012 S S StartTime asso ff p aaaf o t00 001157 75006 amoa 100001152 750036 3 8 3 Clearing Logged Data from Internal Memory The internal memory has a capacity of almost 2GB which is sufficient to allow continuous logging at the maximum rate for over 15 000 hours 625 days Clear logged data from the internal memory to free capacity or discard data by pressing the MAEI F4 key and using the keys to select GER ei Koo E DEIE Isothermal Technology Page 37 of 101 923 milliK Issue 1 05 Clear Logged Data Kumeric Settings Press the key to clear the memory The milliK will then display the number of files you are about to remove and will ask you to provide the password see section 3 11 in order to proceed 3 9 Using the Thermometer Database The milliK includes a database for thermometers you wish to use regularly You can create delete or modify thermometers in the database Information includes details to identify the thermometer manufacture model and serial number track calibration status re calibration date convert readings to temperature conversion type and coefficients minimum and maximum operating temperature and identify whe
77. nored Example to select 3 wire measurement for the next resistance measurement use SENS RES WIR 3 8 6 13 Command SENSe RESistance WIiRes Format SENSe RESistance WIRes Reports whether 3 or 4 wire measurement is selected for the next resistance measurement Example a milliK that has been set to make a 4 wire resistance measurement will respond to the command SENS RES WIR with 4 8 6 14 Command SENSe CURRent Format SENSe CURRent lt current gt Determines whether the normal 1mA or root2 1 4mA current is used for the next resistance measurement on a PRT SPRT Changing the current to root2 allows the self heating effect to be determined for a PRT SPRT see section 3 1 2 for details This command affects the sense current used to measure PRTs SPRTs 115Q and 460Q ranges it does not affect the sense current used to measured thermistors fixed at 2uA The current is not changed until a measurement is started using with either the INITiate or READ commands The parameter lt current gt may be NORMal or ROOT2 the command will be ignored if any other parameter is used Example to set the sense current for the next resistance measurement to the normal current 1ImA use SENS CURR NORM Isothermal Technology Page 89 of 101 923 milliK Issue 1 05 _ISOT CH _ 8 6 15 Command SENSe CURRent Format SENSe CURRent Reports the current that will be used for the next resistance measurement Example a milliK
78. note that there is no gap between the command and the channel number as this command makes use of the numeric suffices feature of SCPI described in section 8 3 The reported value is in volts This command is equivalent to SENS FUNC volt SENS CHAN lt channel gt and READ Example to make a voltage measurement on channel 2 use MEAS VOLT2 8 6 20 Command MEASure SCALar RESistance lt channel gt Format MEASure SCALar RESistance lt channel gt lt range gt lt current gt lt wires gt Initiates and reports a resistance measurement on lt channel gt using resistance lt range gt with sense lt current gt and 3 or 4 wires measurement defined by lt wires gt note that there is no gap between the command and the channel number as this command makes use of the numeric suffices feature of SCPI described in section 8 3 The reported value is in ohms This command is equivalent to SENS FUNC RES SENS CHAN lt channel gt SENS RES RANG lt range gt SENS WIR lt wires gt and READ Example to measure the resistance of a PRT on channel that has a maximum operating resistance of 390Q with root2 sense current using a 4 wire technique use MEAS RES1 390 root2 4 8 6 21 Command MEASure SCALar CURRent Format MEASure SCALar CURRent Initiates and reports a current measurement on channel 3 4 20mA input on rear panel The reported value is in milli amps This command is equivalent to SENS FUNC CURR SENS CHAN 3 and REA
79. on SEP Example for a milliK with serial number ITL12345 using software version 1 22 33 the milliK responds to IDN with Isothermal Technology milliK ITL12345 1 22 33 8 6 6 Command SENSe FUNCtion ON Format SENSe FUNCtion ON lt function gt Selects the measurement function The parameter lt function gt must be one of the following valid SCPI parameters l RESistance VOLTage DC i CURRent Example to set the milliK to measure resistance use SENS FUNC RES 8 6 7 Command SENSe FUNCtion ON Format SENSe FUNCtion Reports the present measurement function RESISTANCE VOLTAGE or CURRENT Example a milliK set to measure voltage will respond to SENS FUNC with VOLTAGE 8 6 8 Command SENSe CHANnel Format SENSe CHANnel lt channel gt Isothermal Technology Page 87 of 101 923 milliK Issue 1 05 _ISOT CH _ Selects the channel for the next measurement The channels on the front panel are numbered 1 and 2 The 4 20mA input on the rear panel is numbered 3 The channel is not actually connected to the measurement system until a measurement is started using with either the INITiate or READ commands Example to select channel 2 for the next measurement use SENS CHAN 2 8 6 9 Command SENSe CHANnel Format SENSe CHANnel Reports the channel selected for the next measurement The channels on the front panel are numbered and 2 The 4 20mA input on the rear panel is numbered 3 Ex
80. onnector Isothermal Technology Page 55 of 101 923 milliK Issue 1 05 _ISOT CH 4 4 Connecting 4 20mA Transmitters to milliK In order to connect a 4 20mA transmitter to your milliK fit 4mm plugs to your transmitter The milliK supports both self powered and loop powered transmitters by providing a 24V DC supply Connect the transmitter to the 4mm sockets on the rear panel of the milliK using the required configuration f 4 20mA 4 20mA i Self Powered Transmitter Loop Powered Transmitter Isothermal Technology Page 56 of 101 923 milliK Issue 1 05 _ISOT CH _ 5 Calibration The calibration of your milliK can be checked by applying standards to the inputs and noting the indicated readings The milliK includes calibration software that allows you to adjust its calibration The process involves attaching suitable standards to the inputs and entering the values of these standards the calibration software then monitors the measured values and applies any required corrections The calibration data is stored in an internal comma separated variable CSV file that includes the whole calibration history time date stamped back to its original factory calibration The calibration file can be exported to a USB drive so that it can be read for example by importing it into Microsoft Excel The calibration software requires you to enter additional information such as model serial numbers of the standards used in order to
81. othermal Technology Page 3 of 101 923 milliK Issue 1 05 _ISOT CH _ 8 6 16 Command INITiate IMMediate ALL oo ccc eceeceseeceseseeeeees 90 S 0 l 7 Command PETES CAL ae oroarea A AATA 90 56 18 Command READ SCA Lar ensaian ana n a a a e 90 8 6 19 Command MEASure SCALar VOLTage DC lt channel gt ee 90 8 6 20 Command MEASure SCALar RESistance lt channel gt 2 0 0 0 ccc ee eec seuss 9 8 6 21 Command MEASure SCALar CURRent oo ccc eceeceseeccencesenss 9 8 0 22 Command MEA Surel SCA lar RIC eee ezasseavadacatalecatavestdacebadanssecs 9 8 6 23 Command MONitor lt channel gt 0 0 cccecceceecescscsccsccescesencescesescuseseucs 92 8 024 Command C AL ibrate UNLOCK rarse e leet E EEE te aaa 92 80 23 Command CALIDrUS LOCK e eE EENE EE EEA EA EEE 92 8 6 26 Command CALibrate RESistance GAIN c cece ccccceececeecesescnsescesensesenss 92 8 6 27 Command CAlLibrate RESistance GAIN seneneeesesesesnsnsssesesesesesesesesesrsee 93 8 6 28 Command CALibrate VOLTage OFFSet lt channel gt cece ceeeceneeeeeeees 93 8 6 29 Command CALibrate VOLTage OFFset lt channel gt 0 cc ecccceeeceeeseeeeees 94 8 6 30 Command CALibrate VOLTage GAIN cece cceccccsssccnseceneeseceesccneeseneness 94 8 6 31 Command CALibrate VOLTage GAIN cc cccccccssecceesecceneccseseeeenseeaeees 94 8 6 32 Command CALibrate CURRent GAIN 00 cece ceceeceecececescsescesensesenss 94 8 6 33 Command CALibrate
82. owing arrangement T b T b OOnNDOOaRWN OOnNDOOaFRWN Shell Q _ _ _ _O Shell Null Modem Cable The data format for the RS232 interface is as follows Baud Rate 9 600 Start Bits 1 Stop Bits l Parity Bit none You can use Hyperterminal or another terminal emulator to communicate with the millik via the RS232 connections Hyperterminal is part of the standard Windows installation usually located in the Accessories Communications folder If you have installed a minimum laptop or custom configuration without this component for your Windows operating system you may need to install Hyperterminal from your original Windows media Isothermal Technology Page 76 of 101 923 milliK Issue 1 05 _ISOT CH _ Start Hyperterminal to set up a new connection Type in a name for the connection such as milliK and select an icon In the next window select the PC s COM port to which you have connected your milliK from the Connect using drop down list and click OK In the next window enter the data format for the milliK s RS232 interface COM14 Properties AX Port Settings Bits per second 9600 Data bits 8 Parity None Stop bits 1 Flow control None Restore Defaults Click OK to open a Hyperterminal session with the milliK Now save using FilelSave As the Hyperterminal connection so that in future you only have to click on this icon to open an RS232 connection
83. r Callendar Van Dusen equation The ITS90 equations are sometimes also used with industrial PRTs made using the lower sensitivity 0 00385K wire and can provide a small improvement in uncertainty compared with the Callendar Van Dusen equation If your thermometer calibration is presented using ITS90 coefficients use the keys in the Thermometer Window to select Conversion and then use the keys to select ITS90 Use the keys to select Coefficients and then press the M key to open the ITS90 Coefficients Window Isothermal Technology Page 42 of 101 923 milliK Issue 1 05 ITS90 coetficients Mune 25 SOO000000 t gt O0 01 C b Use the keys to select each parameter in turn and press the key to open a soft numeric keypad and enter the value from the calibration certificate If no coefficient is supplied not all coefficients are required leave the value set to zero If your thermometer is supplied with a calibration over the range 38 8344 C mercury triple point to 29 7646 C gallium melting point it should be provided with two coefficients a and b To enter these use the keys to select the t lt 0 01 C button and use the to change this to 38 8 lt t lt 29 7 C The a and b coefficient can then be entered below the button 3 9 5 Using a Thermocouple with Calibration Coefficients Data Pairs The EMF temperature characteristics of thermocouples are non linear and the milliK use
84. rder to provide fully automated calibration The milliK must be connected to the temperature source with an RS232 to RS422 converter cable these are the yellow cables supplied with each Isotech temperature source You can connect to either RS232 port on the milliK as it automatically discovers any temperature source on restart and configures that port to use the Modbus protocol required to control the Isothermal Technology Page 49 of 101 923 milliK Issue 1 05 _ISOT CH temperature source Restart the milliK cycle the power or use the Restart Update Software button in the Instrument Window with the lead connected and the temperature source powered to establish a connection The milliK will then add buttons at the bottom of the Settings Window to allow you to select a temperature profile Channel Channel 1 Status Thermometer Type Conversion Range Units Samples Reading Readings in Stats SO Setpoint Temp Setpoint Status Stopped Numeric Settings Instrument The Setpoint Temp button allows you to select a temperature profile or disable this feature Reference Junction 100 by selecting None Temperature profiles can be created in the Instrument Window see section 3 12 1 Use the keys to select the Setpoint Temp button and press the i key to open the Setpoint List Window Select Setpoint Profile Mone PRT Cal 0 200C Cancel lage lage Down Us
85. s standard algorithms from IEC584 apart from gold platinum and type L to convert the measured EMF to a temperature Thermocouples can be calibrated individually to achieve better measurement uncertainty The calibration is presented as a deviation function polynomial or as data pairs The milliK supports a third order polynomial correction and data pairs linear interpolation between the data pairs In the Thermometer Window use the keys to select Conversion and then use the keys to select the required thermocouple type Now use the keys to select Coefficients and press the fl key to open the Thermometer Coefficients Window Isothermal Technology Page 43 of 101 923 milliK Issue 1 05 Type J themocouple Reference function IECS84 1995 210 C lt T lt 1200 C Deviation Calibration function Coefficients Cancel Use the keys to toggle Deviation Calibration function between Coefficients and Data Pairs Press the M key to open a soft keypad and enter the required data If you are entering Data Pairs use the keys to select either the Temperature C or EMF mV boxes at the top of the screen and press the key to open a soft keypad and enter the value To delete a data point use the keys to select the point and press the F2 key The 0 0 000 point is fixed and cannot be deleted Temperature ec E Eret uy KNE ee Cancel Do not
86. s 26T T 1 e oT 3 1 3 Using 3 or 4 Wire Measurement The milliK uses a 4 wire connection technique to eliminate the effect of the cable resistance from the measurement This involves supplying the sense current through one pair of wires and monitoring the voltage developed across the PRT element with a separate pair of wires PRT SPRT Since the current along the voltage sense wires is effectively zero the milliK is able to measure the resistance of the PRT element without being affected by the resistance of the wires Isothermal Technology Page 21 of 101 923 milliK Issue 1 05 _ISOT CH _ In some industrial applications a 3 wire connection technique is used in order to reduce the cost of cabling amportant when a large number of PRTs and long cable runs are involved such as in a petrochemical plant In this arrangement there 1s a separate current and voltage Sense connection to one side of the PRT element but the other side has a common connection PRT SPRT The milliK measures the voltage developed across the I wire by measuring the voltage between pins 3 and 6 Provided the wires are all the same gauge and length same resistance the voltage drop down the I wire will be the same so the milliK can subtract this correction from the voltage measured between V and V pins 1 and 6 to determine the voltage across the PRT element In this way the milliK is able to perform a 3 wire measurement that is substantial
87. s the serial number of the temperature source used Example to apply add an offset of 0 05 C to the reference junction measurements determine by using a type N thermocouple with serial number xyz1956 and in a liquid bath with serial number abc9960 use CAL RJC OFFS 0 05 type_N xyz1956 abc9960 or CAL RJC OFFS 0 05 Isothermal Technology Page 95 of 101 923 milliK Issue 1 05 _ISOT CH _ 8 6 35 Command CALibrate RJC OFFSet Format CALibrate RJC OFFSet Reports the lt offset gt in C added to measurements made by the reference junction sensor used for reference junction compensation Example a milliK with 0 1 C added to reference junction temperature measurements will respond to CAL RJC OFFS with 0 1 8 6 36 Command CALibrate IDENtification Format CALibrate IDENtification lt name gt lt company gt lt location gt lt temperature gt Sets identification information used to stamp any calibrations that are made after this command until the milliK is restarted This information would typically be used to store information on the calibration technician the calibration organisation and environment Example for calibrations made by John Smith at Isotech at Isotech s primary standards laboratory operating at 20 C 1 C use CAL IDEN JSmith Isotech Primary_Lab 19 20C 8 6 37 Command CALibrate IDENtification Format CALibrate IDENtification Reports the calibration information that wi
88. s was developed to provide a consistent command language for all types of programmable instruments The objective was to reduce the development time required by users of these instruments by providing a consistent programming environment through the use of defined messages instrument responses and data formats Further information on SCPI can be obtained from the SCPI Consortium http www scpiconsortium org 8 1 Command Terminators SCPI commands are ASCII American Standard Code for Information Interchange character strings and should be terminated with a Carriage Return character ASCH character 13 Responses from the milliK are always terminated by a Carriage Return character 8 2 SCPI Command Structure Commands are arranged in a hierarchical tree similar to directory trees used in PCs SCPI uses a defined notation to represent the command tree structure Each node in the tree structure is a command keyword with keywords being separated by colons To simplify the description of the SCPI commands the notation represents levels in the tree using horizontal indentations with the root node being the left most column For example the milliK includes the following command structure SENSe FUNCTION CHANNEL RESistance RANGe RANGe READ CALibrate gt VOLTage GAIN gt VOLTage GAIN A valid command is formed by following the tree structure from a root node until a node is reached with no further nodes below it for
89. shows Mean of 100 The mean value indicated by the milliK is the zero reading for voltage measurement on channel 1 Repeat the procedure on Channel 2 Isothermal Technology Page 62 of 101 923 milliK Issue 1 05 _ISOT CH _ 5 2 4 Thermocouple Voltage Range Span Check Connect a calibrated nominally 100mV voltage source to channel 1 using a copper miniature thermocouple connector It is difficult to find signal generators that have an adequate specification to check the performance of the milliK However you can create your own system by connecting a calibrated 10mA current source to a 10Q 4 terminal calibrated resistor Miniature Thermocouple Connector The connections from the 10Q resistor to the thermocouple connector should be entirely in copper and should not involve intermediate connectors to avoid thermal EMEFs Set the milliK to read this voltage by changing the parameters in the Settings Window see section 5 2 3 for details of settings Press the TWP F2 key clear the statistics and wait for 100 measurements to be made when the display shows Mean of 100 The mean value indicated by the milliK should be compared with the calculated value of the applied voltage apply a correction to the value of the resistor if its temperature coefficient of resistance is significant as is often the case for low ohmic values such as 10Q Repeat the procedure on Channel 2 5 2 5 4 20mA Transmitter Rang
90. sing SCPI Commands In order to measure the voltage from a thermocouple you need to select the measurement channel set the milliK to measure voltage l make the measurement To measure the voltage from a thermocouple connected to channel 1 send the following command sequence SENS CHAN 1 SENS FUNC VOLT READ Isothermal Technology Page 83 of 101 923 milliK Issue 1 05 _ISOT CH _ The milliK will then report the measured voltage for example 1 12999999E 007 Send READ to make subsequent measurement using the same settings The following command performs the same measurement MEAS VOLT1 8 6 3 Measuring Temperature using SCPI Commands In order to measure temperature you need to make one of the base unit measurements resistance for PRTs SPRTs thermistors or voltage for thermocouples and then convert this into a temperature using a conversion algorithm for example ITS 90 for an SPRT The data for the conversion temperature algorithms is stored in a database accessed from the operator interface It would be very difficult to make this information available through SCPI commands so it is not possible to request a measurement in temperature units using SCPI commands However it is possible to set up measurement s using the operator interface and then to access the results using SCPI commands To do this simply setup your milliK to make the required measurement from the front panel see section 3 1 for an example
91. ssword is provided to protect the calibration of the milliK Both passwords are initially set to 1234 but should be changed prior to use in order to ensure the security of measurements made using your milliK see section 3 11 A password recovery process is available if you forget your password please contact Isothermal Technology or its approved distributor for assistance 1f required see section 3 11 1 Isothermal Technology Page 16 of 101 923 milliK Issue 1 05 _ISOT CH _ 2 3 Battery Operation The milliK is primarily intended for use as an AC powered bench top instrument and is supplied with a universal power supply for this purpose However it may also be powered from batteries not supplied so that it can be used where an AC electrical supply is not available The battery compartment is located on the rear panel To gain access squeeze the tabs on the sides of the battery draw and slide it out The battery compartment accepts four AA size cells The milliK can use primary alkaline or lithium cells or rechargeable NiMH cells Lithium cells provide the longest battery life 6 hours but are expensive and are not rechargeable Rechargeable NiMH cells provide good battery life gt 4 hours and being rechargeable offer low running costs they are therefore the recommended solution for users wishing to use battery powered operation Alkaline cells can be used but they provide limited operating life tests have sho
92. st The non linear resistance temperature characteristics make thermistor sensors very sensitive over a limited temperature range Their relatively high resistance means that 4 wire measurement is not as important as with PRTs SPRTs although the millik still uses 4 wire measurement However their high resistance makes them more prone to electrical interference so greater care is required when connecting them to the milliK in particular the use of screened cables is highly recommended see section 4 2 Unlike PRTs SPRTs the resistance temperature characteristics vary considerably between different types of thermistor There are therefore no nominal or generic conversion algorithms The millik can be used to monitor the resistance of a thermometer declared to be a Default Thermistor but in order to measure temperature the thermistor and its calibration details must be entered into the milliK s thermometer database Connect your thermistor to either of the Lemo 6 pin circular connectors on the front panel using a 2 wire or 4 wire connection arrangement see section 4 2 for pin out and connection details Ensure that the miniature thermocouple connector for the same channel is unused since it is connected in parallel with the Lemo connector Your milliK is supplied with two Lemo connectors for you to use with thermistors The part number for this connector is Lemo part number FGG 1B 306 CLAD62Z Additional connectors are readily avai
93. t Isothermal Technology Page 57 of 101 923 milliK Issue 1 05 _ISOT CH _ 5 1 Standards Required for Calibration The following standards are recommended for checking or adjusting the calibration A 4 terminal short circuit see section 5 1 1 for details of how to make one A calibrated 100Q resistor of suitable quality A calibrated 400Q resistor of suitable quality A calibrated 500kQ resistor of suitable quality A OmV short circuit connected to a miniature thermocouple plug see section 5 1 2 for details of how to make one A 10mA precision current reference such as the Metron Designs I REF2 This is used to calibrate the 4 20mA input but it can also be used in calibrating the 115mV input by connecting it to a calibrated 10Q resistor of suitable quality to generate a nominal 100mV calibration signal A 100mV signal source can be used to check and adjust the voltage measurement system but since we are trying to calibrate at the lt luV level suitable calibration sources are expensive Since you already need a 10mA source to calibrate the 4 20mA input using a calibrated 10Q resistor to generate the signal offers a reliable and inexpensive solution A calibrated 10Q resistor for use with the 10mA source to generate a 100mV signal i A thermocouple of adequate quality A type T thermocouple is suitable since it has a high sensitivity near ambient temperatures and is readily available Sa GE All the calibrated r
94. t but we recommend type J thermocouples as these have high sensitivity near Isothermal Technology Page 64 of 101 923 milliK Issue 1 05 _ISOT CH room temperature and are readily available the thermocouple needs to be fitted with a type J miniature thermocouple plug Connect the thermocouple to channel and set the milliK to read C with internal RJC by changing the parameters in the Settings Window Channel Channel 1 Status Thermometer Default Thermocouple Type Conversion Range Unit Reference Junction SamplesReadng 1 o Readings in Stats Numeric Settings Instrument Press the TVET F2 key clear the statistics and wait for 100 measurements to be made when the display shows Mean of 100 The mean value indicated by the milliK should be compared with the known temperature Any discrepancy may be the result of errors in the RJC system or the thermocouple used You might consider using an ice bath for the known temperature and this is a reasonable choice However the error on a type J thermocouple even at 20 C might be 5uV or even higher which corresponds to a temperature error of approximately 0 2 C An alternative approach would be to use room temperature as the known temperature and to measure this with a calibrated PRT connected to the milliK This approach has the advantage that the difference between room temperature and the reference junction in the milliK is likely to be v
95. that has been set to normal current and one of the PRT ranges 115 or 460Q will respond to the command SENS CURR with 1 00000E 003 i e ImA 8 6 16 Command INITiate IMMediate ALL Format INITiate IMMediate ALL Initiates a measurement using the conditions defined by previous SENSe commands The measurement is made immediately but not reported Example to initiate a voltage measurement that has been defined with SENSe commands such as SENS CHAN 1 SENS FUNC volt use INIT 8 6 17 Command FETCh SCALar Format FETCh SCALar Reports the result of the last measurement made Example a milliK that has made a measurement on channel 1 using the commands shown in the example in section 8 6 16 will respond to FETC with a value in the form 0 00154514 8 6 18 Command READ SCALar Format READ SCALar Initiates and reports a measurement using the conditions defined by previous SENSe commands This is equivalent to INIT followed by FETCh Example a milliK that has been configured to make a voltage measurement using SENSe commands such as SENS CHAN 1 SENS FUNC volt will respond to READ with a value in the form 0 00154514 8 6 19 Command MEASure SCALar VOLTage DC lt channel gt Format MEASure SCALar VOLTage DC lt channel gt Isothermal Technology Page 90 of 101 923 milliK Issue 1 05 _ISOT CH _ Initiates and reports a voltage measurement on lt channel gt
96. ther it uses 3 or 4 wire connection PRTs only Thermometers in the database will appear in the list of available Thermometer types in the Window provided that they are compatible with the selected channel This means that only thermometers with Type set to PRT Thermocouple or Thermistor will appear for channels and 2 4 20mA transmitters will not appear 3 9 1 Creating a New Thermometer Entry Press the MAUN F4 key use the keys to select QKE DAGE and press the key You will then be asked to enter the password before continuing A Window will then appear offering the options to create edit or remove a thermometer Isothermal Technology Page 38 of 101 923 milliK Issue 1 05 Please Select Create New Thermometer Edit Existing Thermometer Remove Thermometer Use the keys to select ALECA NM ENOM and press the M key to open the Thermometer Window Mame lt hName gt Type PRT Manufacturer Model Serial Number a Re calibration Date Minimum Maximum T Wires Conversion Cancel Use the keys to select each parameter in turn and press the key to open a Window and enter a value or select an option A typical entry for an SPRT would be Name Lab 909 SPRT Type Manufacturer Mode 8 Serial Number Re calibration Date Minimum T Maximum T Wires Conversion Cancel Isothermal Technology Page 39 of 101 923 milliK Issue 1 05 _ISOT CH _ The list of avai
97. tion ON CHANnel CHANnel RESistance RANGef UPPer RANGe UPPer WIRes WIRes CURRent CURRent INITiate IMMediate ALL FETCh SCALar READ SCALar MEASure SCALar lt function gt lt channel gt lt range gt lt wires gt lt current gt gt VOLTage DC lt channel gt RESistance lt channel gt CURRent RJC MONitor lt channel gt CALibrate UNLock LOCK RESistance GAIN RESistance GAIN lt resistance range gt lt current gt lt wires gt lt timeout gt lt password gt lt resistance range gt lt current gt lt gain gt standard lt resistance range gt lt current gt VOLTage OFFSet lt channel gt lt offset gt VOLTage OFFset lt channel gt VOLTage GAIN VOLTage GAIN CURRent GAIN CURRent GAIN RJC OFFSet RJC OFFSet IDENtification IDENtification IDENtification LAST PASSword VALid Isothermal Technology lt gain gt lt standard additional info gt lt gain gt standard lt offset gt lt TC type gt lt serial gt information lt name gt lt company gt lt location gt lt temperature gt lt old password lt password gt lt password gt Page 86 of 101 923 milliK Issue 1 05 _ISOT CH _ A detailed description of each command follows 8 6 5 Command IDN Format IDN Reports information on the milliK in 4 comma separated fields manufacturer model serial number firmware versi
98. to 1 but can be increased to a maximum of 100 This will cause the milliK to take the specified number of samples for each reading and will reduce the noise at the expense of slower measurement speed 2 2 4 The Instrument Window In the Instrument Window you can access the milliK s database of thermometers perform maintenance tasks such as backing up clearing or restoring information stored to internal memory updating software calibrating your milliK change the IP address passwords date time settings and define temperature profiles you wish to use when calibrating thermometers with your Isotech temperature source Create Edit Delete Thermometer Backup Thermometers Load Thermometers Backup Logged Data Clear Logged Data Instrument Settings Restart Update Software Calibration Change Passwords Set Time Date setpoint Temperatures Numeric Settings Use the keys to select the required function and then press the fi key to open a new Window to access that function Some functions are password protected in which case a soft keyboard will appear and you will be asked to enter the password before proceeding A password is required to continue u a s a t Bhi idk it 2 xfelv b n m _ Cancel Caps Lock Backspace Isothermal Technology Page I5 of 101 923 milliK Issue 1 05 _ISOT CH Use the keys to move to a button and select it using the key Press OK to enter the password A separate pa
99. urements are made with a 1mA sense current but this can be increased to 1 428mA in order to determine the self heating effect see section 3 1 2 The Samples Reading setting is the number of samples averaged together to form a single reading Increasing this value will reduce the noise on the measurements standard deviation will reduce as the square root of the number of samples but also slows down the update rate Higher accuracy measurements can be made using calibrated PRTs SPRTs whose resistance temperature characteristics have been determined Before being used the thermometer and its calibration details must be entered into the milliK s thermometer database see section 3 9 1 The thermometer will then appear in the Thermometer list Use the keys to sequence through the thermometers or press the key to open a new Window with all thermometers listed Isothermal Technology Page 19 of 101 923 milliK Issue 1 05 Select Thermometer Default Thermistor Default Thermocouple AuPt thermocple Lab SPRT 1 Lab SPRT 2 Select the thermometer and set the remaining parameters in the Window A typical configuration for a calibrated SPRT would be Channel Channel 1 Status Thermometer Type Conversion Range Units Current Samples Reading Readings in Stats Numeric Settings Instrument Once you have configured the milliK to work with your PRT SPRT press either the Graph F1 or Numeric F2 keys to v
100. use the thermocouple outside the temperature range defined by the data pairs as errors may be more than those declared in the calibration certificate 3 9 6 Using a Thermistor with the Steinhart Hart Polynomial The resistance temperature characteristics of a thermistor are highly non linear essentially logarithmic The Steinhart Hart equation is commonly used to convert the measured resistance to temperature The three coefficients A B C used in the equation should be Isothermal Technology Page 44 of 101 923 milliK Issue 1 05 _ISOT CH _ specified for the thermometer you are using there is no generic characteristic for thermistors Use the keys in the Thermometer Window to select Conversion and then use the keys to select Steinhart Hart Use the keys to select Coefficients and then press the M key to open the Steinhart Hart Coefficients Window Steinhart Hart coefficients 2 01142E 035 1 310384E 03 LT A BlnfRit c In k 4 Use the keys to select each coefficient in turn and press the key to open a soft numeric keypad and enter the required value 3 9 7 Using a Thermistor with Polynomial Temperature Conversion The Steinhart Hart equation uses a third order polynomial with the second order term missing Recently some thermistor suppliers have been using a third order polynomial to characterise their thermistors with all four coefficient present and non zero gt C
101. wn that alkaline cells offer half the operating life of NiMH cells with the same quoted capacity mAh because they have a higher output impedance during discharge leading to a lower output voltage Isothermal Technology Page 7 of 101 923 milliK Issue 1 05 _ISOT CH _ 3 Detailed Description by Function This section describes all the features available on the milliK by function If you wish to learn how to do something with your milliK use the table of contents on page 2 onwards to look up the appropriate section 3 1 Using a PRT SPRT with millik The milliK can measure the resistance of PRTs and SPRTs It can convert measurements from resistance to temperature units K C or F so that you can make precise temperature measurements or calibrate other thermometers from a reference standard The milliK provides two resistance measurement ranges which are optimised for PRTs and SPRTs e 0 115Q optimised for 25 5Q SPRTs e 0 460Q optimised for 100Q PRTS The milliK will measure 25 5Q SPRTs on the 460Q range but better measurement uncertainty is achieved by using the 115Q range The sense current for both ranges is ImA or 1 428mA Connect your PRTs SPRTs to either of the Lemo 6 pin circular connectors on the front panel see section 4 1 for pin out and connection details Ensure that the miniature thermocouple connector for the same channel is unused since it is connected in parallel with the Lemo connector Isotech
102. y will be transferred to the USB drive in a folder located at milliK serial_no where serial no is the serial number of the milliK If the files already exist on the USB drive a Window will open allowing you to specify whether or not to overwrite each file you can specify whether or not to overwrite each individual file or all files logtile_20110330_1541 already exists Don t Overwrite Any Don t Overwrite Once Overwrite nce Overwrite All If you choose to overwrite files you will be required to enter the password see section 3 11 The CSV logged data can be imported into Excel by selecting Open in Excel selecting Text Files prn txt csv under Files of type and navigating to the required file A Text Import Wizard will appear choose Delimited as the Original data type in the first Window and ensure that Comma is selected as one of the Delimiters in the second Window The data will then be imported sensibly into the cells of the spreadsheet 3 8 2 File Format for Logged Data The first 27 rows of the spreadsheet contain information about the configuration of the milliK during logging Rows 28 onwards contain the elapsed time in seconds and logged data for all channels that are enabled Isothermal Technology Page 36 of 101 923 milliK Issue 1 05 po Channelt Channel2_ Channel3 o S ee S Enabled Yes Nf es punts S da e e Current ma Jima im a Reference Ju

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