Isotech milliK User Maintenance Manual/Handbook Download Page 66

Page: 66 / 102

Page 66 of 102

923 milliK manual - issue: 1.10

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 1 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) 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 100

Ω

reading on the 115

Ω

range

Adjust 400

Ω

reading on the 460

Ω

Adjust 500k

Ω

reading on the 500

Ω

Adjust 0mV reading on channel 1

Adjust 0mV 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

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:

Summary of Contents for milliK

Page 1: ...x 44 0 1704 544799 Internet Tel 44 0 1704 543830 Fax 44 0 1704 544799 Internet Tel 44 0 1704 543830 Fax 44 0 1704 544799 Internet Tel 44 0 1704 543830 Fax 44 0 1704 544799 Internet www isotech co uk w...

Page 2: ...h milliK 30 3 4 1 Configuring milliK to Measure a 4 20mA Transmitter 31 3 5 Measuring the Difference Between Two Channels 32 3 6 Changing Graph Scales 32 3 7 Using Rolling Statistics 33 3 8 Logging Re...

Page 3: ...Voltage Offsets 69 5 3 6 Adjusting Voltage Gain 69 5 3 7 Adjusting 4 20mA Transmitter Range 70 5 3 8 Adjusting the RJC Sensor Calibration 71 5 4 Exporting Calibration information 72 6 Maintenance and...

Page 4: ...CALibrate RESistance GAIN 92 8 6 28 Command CALibrate VOLTage OFFSet channel 92 8 6 29 Command CALibrate VOLTage OFFset channel 93 8 6 30 Command CALibrate VOLTage GAIN 93 8 6 31 Command CALibrate VOL...

Page 5: ...ides 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 shou...

Page 6: ...ndoor 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...

Page 7: ...gy Page 7 of 102 923 milliK manual issue 1 10 UL60950 1 2nd Edition 2007 03 27 CSA C22 2 No 60950 1 07 2nd Edition 2007 03 EN 60950 1 2006 including A11 BS EN60950 1 2006 AS NZS60950 1 2003 including...

Page 8: ...cal 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...

Page 9: ...ials 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 connectors Lemo 6 pin circular c...

Page 10: ...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 c...

Page 11: ...lliK software will then start and you will see the main Windows There are four main Windows which can be selected using the function keys below the display The software always starts with the Graph Wi...

Page 12: ...he 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 keys to sequence through the channels or press the key to o...

Page 13: ...e 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 yo...

Page 14: ...elect it The Page Up Page Down 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 setti...

Page 15: ...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 passwo...

Page 16: ...ed 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 secti...

Page 17: ...attery 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 a...

Page 18: ...but better measurement uncertainty is achieved by using the 115 range The sense current for both ranges is 1mA or 1 428mA Connect your PRTs SPRTs to either of the Lemo 6 pin circular connectors on th...

Page 19: ...rements 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 aver...

Page 20: ...Select the thermometer and set the remaining parameters in the Settings Window A typical configuration for a calibrated SPRT would be Once you have configured the milliK to work with your PRT SPRT pre...

Page 21: ...urrent 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 mA which increases the power dissipated by a fa...

Page 22: ...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 substantially immune to the resistance of the wires...

Page 23: ...e 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 n...

Page 24: ...ameter 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 fo...

Page 25: ...ata 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 thermoco...

Page 26: ...of the same material as the wire itself It is essential that the correct typed connector is used with the thermocouple Reference Measurement Junction Junction M M When using a thermocouple with inter...

Page 27: ...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 im...

Page 28: ...ith 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 calibra...

Page 29: ...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 woul...

Page 30: ...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 0V and a 24V supply Connect the transmitter between the...

Page 31: ...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 throug...

Page 32: ...is available in both the Graph or Numeric Windows where the differential option is listed amongst the other single channels on the Channel x button or in the channels list that open when this button...

Page 33: ...nd cannot be selected Change this to Manual in order to access these parameters by selecting the Automatic Manual button and pressing the key 3 7 Using Rolling Statistics The milliK reports the mean a...

Page 34: ...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 t...

Page 35: ...his opens the File Location Window 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 defau...

Page 36: ...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 overwr...

Page 37: ...4 Wire PRT Default 4 Wire PRT Serial Number Recalibration Date 31 12 2099 31 12 2099 31 12 2099 Minimum Temperature 273 15 273 15 0 Maximum Temperature 2000 2000 200 Temperature Conversion None IEC607...

Page 38: ...readings to temperature conversion type and coefficients minimum and maximum operating temperature and identify whether it uses 3 or 4 wire connection PRTs only Thermometers in the database will appe...

Page 39: ...ue 1 10 Use the keys to select Create New Thermometer and press the key to open the Thermometer Window Use the keys to select each parameter in turn and press the key to open a Window and enter a valu...

Page 40: ...ith 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 mo...

Page 41: ...ristics 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 Callen...

Page 42: ...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...

Page 43: ...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 uses standa...

Page 44: ...elete a data point use the keys to select the point and press the Delete F2 key The 0 0 000 point is fixed and cannot be deleted Do not use the thermocouple outside the temperature range defined by th...

Page 45: ...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 missin...

Page 46: ...inimum output value and 20mA indicates the maximum Current below 4mA is often used to indicate a fault condition in the transmitter To use linear interpolation of the current and determine the measure...

Page 47: ...s 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 th...

Page 48: ...ress the Instrument F4 key use the keys to select Change Password and then press the key to open the Password Selection Window Use the keys to select which password you wish to change and then press t...

Page 49: ...ill 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...

Page 50: ...ows you to select a temperature profile or disable this feature by selecting None Temperature profiles can be created in the Instrument Window see section 3 12 1 Use the keys to select the Setpoint Te...

Page 51: ...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 Setpoint Temperatures and then pr...

Page 52: ...ey whilst Immediate is selected to toggle between Immediate profile starts as soon as the OK F4 key is pressed when the profile is selected and On Save profile starts when you start logging data with...

Page 53: ...LAD62Z Additional connectors are readily available internationally from Farnell Electronics and can be ordered via their website www farnell com Farnell stock code 3817325 The pin out of the Lemo conn...

Page 54: ...hould 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 1 to pin 2 see section 3 1 3 4 5 6 1...

Page 55: ...5 6 1 2 I I V V 3 tc THERMISTOR NC NC 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...

Page 56: ...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 s...

Page 57: ...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 be...

Page 58: ...10mA source to calibrate the 4 20mA input using a calibrated 10 resistor to generate the signal offers a reliable and inexpensive solution A calibrated 10 resistor for use with the 10mA source to gene...

Page 59: ...g 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 tw...

Page 60: ...s 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 Appl...

Page 61: ...e resistor if its temperature coefficient of resistance is significant Repeat the procedure on Channel 2 5 2 1 3 PRT Resistance Range 460 Span Check Connect a calibrated nominally 400 resistor to chan...

Page 62: ...e 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 Ch...

Page 63: ...tirely in copper and should not involve intermediate connectors to avoid thermal EMFs Set the milliK to read this voltage by changing the parameters in the Settings Window see section 5 2 3 for detail...

Page 64: ...o it is likely that you will see the readings dithering between 2 values separated by the milliK s current resolution 0 001mA The mean value indicated by the milliK should be compared with the current...

Page 65: ...t 20 C might be 5 V 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...

Page 66: ...s 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 th...

Page 67: ...2 Adjusting SPRT 115 Resistance Range Connect a calibrated nominally 100 resistor to channel 1 In the Calibration Menu Window use the keys to select 115 Range and then press the key to proceed to the...

Page 68: ...ess cannot be aborted 5 3 3 Adjusting PRT 460 Resistance Range Connect a calibrated nominally 400 resistor to channel 1 In the Calibration Menu Window use the keys to select 460 Range and then press t...

Page 69: ...Once started the calibration adjustment process cannot be aborted Repeat the procedure on Channel 2 5 3 6 Adjusting Voltage Gain Connect a calibrated nominally 100mV signal to channel 1 see section 5...

Page 70: ...4 20mA Transmitter Range Connect a calibrated nominally 10mA current source to the 4mm sockets designated channel 3 on the rear of the milliK 10mA Calibrated Current Source In the Calibration Menu Wi...

Page 71: ...n 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 uncal...

Page 72: ...ion 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 in...

Page 73: ...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...

Page 74: ...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...

Page 75: ...Connect your milliK to a PC using the null modem RS232 cable supplied If you wish to make your own cable use the following arrangement 1 2 3 4 5 6 7 8 9 Shell 1 2 3 4 5 6 7 8 Shell 9 Null Modem Cable...

Page 76: ...RS232 connection 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 Te...

Page 77: ...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 Click on...

Page 78: ...ection and display the screen as it appears on your milliK Click Tools Config and select the Whole Screen radio button in the Update area to ensure that the screen remains synchronised with your milli...

Page 79: ...should be terminated with a Carriage Return character ASCII character 13 Responses from the milliK are always terminated by a Carriage Return character 8 2 SCPI Command Structure Commands are arranged...

Page 80: ...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 includ...

Page 81: ...king 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 ei...

Page 82: ...f 80 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...

Page 83: ...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 mi...

Page 84: ...Isothermal Technology Page 84 of 102 923 milliK manual issue 1 10...

Page 85: ...hannel RESistance channel resistance range current wires CURRent RJC MONitor channel timeout CALibrate UNLock password LOCK RESistance GAIN resistance range current gain standard RESistance GAIN resis...

Page 86: ...hermal Technology milliK ITL12345 1 22 33 8 6 6 Command SENSe FUNCtion ON Format SENSe FUNCtion ON function Selects the measurement function The parameter function must be one of the following valid S...

Page 87: ...surement will respond to SENS CHAN with 1 8 6 10 Command SENSe RESistance RANGe UPPer Format SENSe RESistance RANGe UPPer range Sets the range for the next resistance measurement The 3 resistance rang...

Page 88: ...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 current Determines whether the normal 1mA or root2 1 4mA curre...

Page 89: ...n 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...

Page 90: ...el 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 channel SENS RE...

Page 91: ...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 C for C F for F Example if channel 2 is c...

Page 92: ...re a resistance gain of 1 001234 for the resistance range 0 460 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...

Page 93: ...standard and additional info 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 calibr...

Page 94: ...ber 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 ga...

Page 95: ...temperature 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...

Page 96: ...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...

Page 97: ...Type N 600 C 0 04 C 0 06 C Type R 1000 C 0 09 C 0 12 C Type S 1000 C 0 10 C 0 14 C Type T 200 C 0 02 C 0 03 C Au Pt 600 C 0 06 C 0 08 C Thermocouples internal reference junction compensation Type B 1...

Page 98: ...her than an ice point reference the total accuracy also depends on the slope of the V T curve at the reference junction temperature typically around 20 C The temperature accuracy figures for thermocou...

Page 99: ...Isothermal Technology Page 99 of 102 923 milliK manual issue 1 10 x axis measured temperature in C y axis temperature accuracy on C...

Page 100: ...ctive 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...

Page 101: ...for FCC compliance Conducted Emissions EN61326 2006 CFR47 2009 Radiated Emissions EN61326 2006 CFR47 2009 Conducted Immunity EN61326 2006 Radiated Immunity EN61326 2006 Electrical Fast Transients EN6...

Page 102: ...ry Change Note Date Manual Issue Initial release April 2011 1 01 CN11008 17 06 2011 1 02 CN12002 07 02 2012 1 03 CN 12013 16 05 2012 1 04 CN 12014 30 05 2012 1 05 CN 12029 08 11 2012 1 06 CN 13013 21...

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