Isotech milliK User Maintenance Manual/Handbook

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Isothermal Technology Limited, Pine Grove, Southport, PR9 9AG, England

Tel: +44 (0)1704 543830 Fax: +44 (0)1704 544799 Internet: www.isotech.co.uk

Tel: +44 (0)1704 543830 Fax: +44 (0)1704 544799 Internet:

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.

User Maintenance Manual/Handbook

Issue 1.10

Software version 2.0.0+

Firmware version 2.0.0+

info@isotech.co.uk

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923 milliK manual - issue: 1.10

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Page 1 Isothermal Technology Limited, Pine Grove, Southport, PR9 9AG, England Isothermal Technology Limited, Pine Grove, Southport, PR9 9AG, England 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 www.isotech.co.uk E E E E - - - - mail: mail:...
Page 2: Table Of Contents
Using 3 or 4 Wire Measurement ................ 21 Using a Thermistor with milliK ................23 3.2.1 Configuring milliK to Measure Temperature with a Thermistor....... 24 Using a Thermocouple with milliK ................25 3.3.1 Using Internal Reference Junction Compensation ..........26 3.3.2...
Page 3 Connecting Thermocouples to milliK ............... 55 Connecting 4-20mA Transmitters to milliK ............. 56 Calibration........................57 Standards Required for Calibration ................58 5.1.1 Making a 4-Terminal Short-Circuit ..............58 5.1.2 Making a 0mV Source in a Thermocouple Connector ........59 Checking the Calibration ................... 59 5.2.1...
Page 4 8.6.40 Command CALibrate:VALid? ................96 Specification ........................97 10 Approvals ........................100 10.1 CE Declaration ....................100 10.2 FCC Statement ..................... 100 10.3 Standards Applied....................101 11 Revision History ......................102 © Isothermal Technology Page 4 of 102 923 milliK manual - issue: 1.10...
Page 5: Introduction
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).
Page 6 The 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.
Page 7 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 amendments 1, 2 and 3 © Isothermal Technology Page 7 of 102 923 milliK manual - issue: 1.10...
Page 8: Getting Started
C8 connector, you can then plug this directly into the C8 socket on the power supply. The plug head can easily be changed: © Isothermal Technology Page 8 of 102 923 milliK manual - issue: 1.10...
Page 9: A Quick Tour Of Your Millik
On the front of your milliK you will find two sets of connectors (Lemo 6-pin circular connectors for SPRTs/PRTs/thermistors and miniature thermocouple connectors) for channels 1 and 2. On the rear of your milliK you will find the 4mm sockets for channel 3 (used exclusively for 4-20mA transmitters).
Page 10 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.
Page 11: Driving Your Millik
Press the right-hand function key below to proceed (or connect a USB keyboard or mouse and press F4 or click Start). The milliK 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 Graph display.
Page 12: The 'Graph' Window
Single Channel All Channels button. If you choose to view a single channel then the base units for the thermometer will be displayed at the same time: © Isothermal Technology Page 12 of 102 923 milliK manual - issue: 1.10...
Page 13: The 'Settings' Window
“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 102 923 milliK manual - issue: 1.10...
Page 14 ↵ ↵ ↵ ↵ 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: ↑ ↑ ↑ ↑ ↓ ↓ ↓ ↓ Use the...
Page 15: The 'Instrument' Window
The ‘Samples/Reading’ setting is initially set 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.
Page 16 Press to enter the password. A separate password 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 if required (see section 3.11.1).
Page 17: Battery Operation
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.
Page 18: Detailed Description By Function
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.
Page 19: Configuring Millik To Measure A Prt/Sprt
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). ← ← ← ← → → → →...
Page 20 Select the thermometer and set the remaining parameters in the Window. A typical configuration for a calibrated SPRT would be: Graph Once you have configured the milliK to work with your PRT/SPRT, press either the Numeric (F1) or (F2) keys to view the measurements: ©...
Page 21: Determining Self-Heating Of A Prt/Sprt
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.
Page 22 4 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.
Page 23: Using A Thermistor With Millik
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.
Page 24: Configuring Millik To Measure Temperature With A Thermistor
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 Settings Settings (F3) key to access the Window, which opens with the ‘Channel’...
Page 25: Using A Thermocouple With Millik
Graph Once you have configured the milliK to work with your thermistor, press either the Numeric (F1) or (F2) keys to view the measurements: ← ← ← ← → → → → ↑ ↑ ↑ ↑ ↓ ↓ ↓ ↓ ↵ ↵ ↵ ↵...
Page 26: Using Internal Reference Junction Compensation
It is essential that the correct “typed” connector is used with the thermocouple:...
Page 27: Using An Ice-Point For The Reference Junction
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 application): Reference...
Page 28: Configuring Millik To Measure A Thermocouple
MUST use a copper miniature thermocouple connector in order to avoid introducing unwanted additional thermal EMFs. 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 ←...
Page 29 (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: Once you have configured the milliK to work with your thermocouple, press either the Graph Numeric...
Page 30: 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 0V and a +24V supply. Connect the...
Page 31: Configuring Millik To Measure A 4-20Ma Transmitter
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 by defining the conversion in the milliK’s thermometer database (see section 3.9.1).
Page 32: Measuring The Difference Between Two Channels
3.5 Measuring the Difference Between Two Channels The milliK can display the difference between any channel and channel 1, provided that the units are the same (otherwise the value would be meaningless). This feature is available in...
Page 33: Using Rolling Statistics
3.7 Using Rolling Statistics The milliK reports the 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 ← ← ← ← → → → →...
Page 34: Logging Results To A File
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.
Page 35 ↵ ↵ ↵ ↵ press the (F4) or keys to open a soft keyboard and enter a filename (a default filename generated from the date/time is suggested automatically): © Isothermal Technology Page 35 of 102 923 milliK manual - issue: 1.10...
Page 36: Transferring Logged Data To A Pc
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 ↑ ↑ ↑ ↑ ↓ ↓ ↓ ↓...
Page 37: Clearing Logged Data From Internal Memory
(to free capacity or discard data) by pressing the (F4) key and ↑ ↑ ↑ ↑ ↓ ↓ ↓ ↓ Clear Logged Data: using the keys to select © Isothermal Technology Page 37 of 102 923 milliK manual - issue: 1.10...
Page 38: Using The Thermometer Database
↵ ↵ ↵ ↵ 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.
Page 39 Window and enter a value or select an option. A typical entry for an SPRT would be: © Isothermal Technology Page 39 of 102 923 milliK manual - issue: 1.10...
Page 40: Using A Prt With Iec60751 (2008) Conversion
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 102 923 milliK manual - issue: 1.10...
Page 41: Using A Prt With Callendar Van Dusen Conversion
“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 102 923 milliK manual - issue: 1.10...
Page 42: Using A Prt With Its90 Conversion
Select ‘Eqn Form’ and press the key to toggle between the a,b,c and α,β,δ versions of the equation. The milliK will automatically convert the coefficients as you change the equation form selected.
Page 43: Using A Thermocouple With Calibration Coefficients / Data Pairs
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).
Page 44: 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 102 923 milliK manual - issue: 1.10...
Page 45: Using A Thermistor With Polynomial Temperature Conversion
(and non zero): ↑ ↑ ↑ ↑ ↓ ↓ ↓ ↓ The milliK supports this full third order conversion. Use the keys in the ‘Thermometer’ ← ← ← ← → → → →...
Page 46: Using A 4-20Ma Transmitter With Linear Conversion
Use the keys to select the temperature at either 4 or 20mA and press the key to open a soft numeric keypad and enter the required value. © Isothermal Technology Page 46 of 102 923 milliK manual - issue: 1.10...
Page 47: Updating The Software
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 ↑ ↑ ↑ ↑ ↓ ↓ ↓ ↓...
Page 48 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. ↑ ↑ ↑ ↑ ↓ ↓ ↓ ↓ Instrument...
Page 49: Recovering A Lost Password
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).
Page 50 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: The ‘Setpoint Temp’...
Page 51: Creating A Temperature Profile
‘Setpoint Status’ box: 3.12.1 Creating a Temperature Profile The milliK allows you to define temperature profiles and store these in a database. To create ↑ ↑ ↑ ↑ ↓ ↓ ↓ ↓ Instrument...
Page 52 3.8). The “Time” is the time interval between the last and current set point change. To create a fixed set point, make only a single temperature entry. © Isothermal Technology Page 52 of 102 923 milliK manual - issue: 1.10...
Page 53: Connecting Thermometers To Millik
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...
Page 54: Connecting Thermistors To Millik
The relatively 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 102 923 milliK manual - issue: 1.10...
Page 55: Connecting Thermocouples To Millik
The relatively high resistance of thermistors means that they are used with much lower sense currents (2µA 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...
Page 56: 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:...
Page 57: Calibration
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.
Page 58: Standards Required For Calibration
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 102 923 milliK manual - issue: 1.10...
Page 59: Making A 0Mv Source In A Thermocouple Connector
A 0mV 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.
Page 60: Prt/Sprt Resistance Range
Apply a 4-terminal short–circuit (see section 5.1.1) to channel 1 and set the milliK to read its Settings resistance on the 115Ω range at 1mA by changing the parameters in the...
Page 61: Thermistor Resistance Range (500Kω) - Span Check
Isotech for investigation. 5.2.1.2 SPRT Resistance Range (115Ω Ω Ω Ω ) – Span Check Connect a calibrated (nominally) 100Ω resistor to channel 1 and set the milliK to read its resistance on the 115Ω...
Page 62: Thermocouple Voltage Range - Zero Check
(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 is the zero reading for voltage measurement on channel 1. Repeat the procedure on Channel 2.
Page 63: Thermocouple Voltage Range - Span Check
10 ). Repeat the procedure on Channel 2. 5.2.5 4-20mA Transmitter Range – Zero and Span Check Set the milliK to read the current on channel 3 by changing the parameters in the ‘Settings’ Window: ©...
Page 64: Reference Junction Compensation Accuracy
2 values separated by the milliK’s current resolution (<0.001mA). The mean value indicated by the milliK should be compared with the current source’s calibrated value.
Page 65 (the thermocouple needs to be fitted with a type J miniature thermocouple plug). Connect the thermocouple to channel 1 and set the milliK to read °C with internal RJC by changing the parameters in the ‘Settings’ Window:...
Page 66: Adjusting The 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...
Page 67: Adjusting Sprt (115 ) Resistance Range
‘115 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 102 923 milliK manual - issue: 1.10...
Page 68: Adjusting Prt (460 ) Resistance Range
Press the (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: Once started, the calibration adjustment process cannot be aborted.
Page 69: Adjusting Zero Voltage Offsets
If you generate the 100mV using a 10Ω 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 102 923 milliK manual - issue: 1.10...
Page 70: Adjusting 4-20Ma Transmitter Range
5.3.7 Adjusting 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 ↑ ↑ ↑ ↑ ↓ ↓ ↓ ↓...
Page 71: Adjusting The Rjc Sensor Calibration
‘RJ Sensor’ and then press ↵ ↵ ↵ ↵ ← ← ← ← → → → → key to proceed to the ‘RJ Sensor Calibration Adjustment’ Window. Use the keys © Isothermal Technology Page 71 of 102 923 milliK manual - issue: 1.10...
Page 72: Exporting Calibration Information
(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 Export...
Page 73: Maintenance And Cleaning
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...
Page 74: Interfacing With Millik
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.
Page 75: Establishing An Rs232 Connection
(not connected) Shell 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 following arrangement: Shell Shell Null-Modem Cable...
Page 76: 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) ↑...
Page 77 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): ©...
Page 78 Click on the required device (“Triton00” in the above example) and then click OK, cerhost will then establish a connection 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 milliK.
Page 79: Scpi Command Set
8 SCPI Command Set The command format and protocol used by the milliK is based on the SCPI (Standard Commands for Programmable Instruments) standard. This was developed to provide a consistent command language for all types of programmable instruments. The objective was...
Page 80: Scpi Numeric Suffices
For example, the command to measure resistance on channel 1 using a range up to 100 ohm at the normal 1mA sense current using a 4-wire technique is: MEAS:RES1? 100,NORM,4 © Isothermal Technology Page 80 of 102 923 milliK manual - issue: 1.10...
Page 81: Units
SCPI commands, you can stop all measurements requested via the Start front panel operator interface. To do this, restart the milliK but do not press the (F4) key in the opening window. The main application that provides the user interface will then not start and no measurements will be requested.
Page 82: Measuring Resistance Using Scpi Commands
SENS:FUNC 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 using SCPI Commands...
Page 83: Measuring Temperature 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 of how...
Page 85: Scpi Commands
8.6.4 SCPI Commands The milliK supports the following commands: *IDN? SENSe :FUNCtion[:ON] <function> :FUNCtion[:ON]? :CHANnel <channel> :CHANnel? [:RESistance] :RANGe[:UPPer] <range> :RANGe[:UPPer]? :WIRes <wires> :WIRes? :CURRent <current> :CURRent? INITiate[:IMMediate][:ALL] FETCh[:SCALar]? READ[:SCALar]? MEASure[:SCALar] :VOLTage[:DC]<channel#>? :RESistance<channel#>? <resistance range>,<current>,<wires> :CURRent? :RJC? MONitor<channel#>? <timeout> CALibrate :UNLock <password>...
Page 86: Command: *Idn
Reports information on the milliK in 4 comma separated fields: manufacturer model serial number firmware version 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] <function>...
Page 87: Command Sense:channel
= 0 - 500k 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 390 at its highest operating temperature, use: SENS:RANG 390 8.6.11...
Page 88: Command Sense:resistance:wires
8.6.13 Command SENSe:RESistance:WIRes? 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 <current>...
Page 89: Command Sense:current
Format: SENSe:CURRent? Reports the current that will be used for the next resistance measurement. Example a milliK that has been set to normal current and one of the PRT ranges (115 or 460 ) will respond to the command: SENS:CURR? with: “1.00000E-003”...
Page 90: Command Measure[:Scalar]:Resistance
Command MEASure[:SCALar]:RJC? Format: MEASure[:SCALar]:RJC? <channel> Initiates and reports a measurement of the reference junction temperature (used with thermocouples for reference junction compensation) of the specified <channel>. The © Isothermal Technology Page 90 of 102 923 milliK manual - issue: 1.10...

Page 91: Command Monitor
°C. If the specified channel does not exist, the milliK returns “channel not found”. Example: to measure the temperature of channel 1’s thermocouple reference junction use: MEAS:RJC? 1 8.6.23 Command MONitor<channel#>? Format: MONitor<channel#>? <timeout> Reports the next measurement (including units) made on <channel#> within the specified <timeout>, in seconds.

Page 92: Command Calibrate:resistance:gain
The <current> 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 0-460 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,1.001234,SN_xyz1956...
Page 93: Command Calibrate:voltage:offset
(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...

Page 94: Command Calibrate:current:gain
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...
Page 95: Command Calibrate:rjc:offset
8.6.37 Command CALibrate:IDENtification? Format: CALibrate:IDENtification? Reports the calibration information that will 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,Isotech,Primary_Lab,19-20C”...
Page 96: Command Calibrate:password
Changes the password used to lock (protect) the calibration of the milliK’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.
Page 97: Specification
Temperature PRTs: IEC60751(2008), Callendar-van Dusen, ITS90 Conversions Thermocouples: IEC584-1 1995 (B,E,J,K,N,R,S,T), L, Au-Pt Thermistors: Steinhart-Hart, polynomial Sensor Currents SPRTs/PRTs: 1mA and 1.428mA ±0.4% (reversing) Thermistors: 2µA (reversing) © Isothermal Technology Page 97 of 102 923 milliK manual - issue: 1.10...
Page 98 The curves below show how the temperature accuracy varies with measured temperature (both initial and 1- year) for all the thermocouple types supported by the milliK when it is used with either an ice-point reference (for highest accuracy) or internal reference junction compensation (the least accurate, but most convenient method).
Page 99 = measured temperature in °C, y-axis = temperature accuracy on °C © Isothermal Technology Page 99 of 102 923 milliK manual - issue: 1.10...
Page 100: Approvals
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)
Page 101: Standards Applied
Conducted Immunity EN61326:2006 Radiated Immunity EN61326:2006 Electrical Fast Transients EN61326:2006 Electrostatic Discharge EN61326:2006 Surge EN61326:2006 Voltage Dips & Interruptions EN61326:2006 Harmonic Currents EN61000-3-2:2006 Flicker EN61000-3-3:2008 Electrical Safety EN61010-1:2001 © Isothermal Technology Page 101 of 102 923 milliK manual - issue: 1.10...
Page 102: Revision History
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 21/05/2013 1.07 CN 13021 11/10/2013 1.08 CN14016 16/05/2014 1.09 CN15007 23/10/2015 1.10 © Isothermal Technology Page 102 of 102 923 milliK manual - issue: 1.10...

Isotech milliK User Maintenance Manual/Handbook

1 Introduction

2 Getting Started

3 Detailed Description by Function

4 Connecting Thermometers to Millik

5 Calibration

6 Maintenance and Cleaning

7 Interfacing with Millik

8 SCPI Command Set

9 Specification

10 Approvals

11 Revision History

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