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Isotech TTI-7-R Operator's Handbook Manual

Precision digital thermometer
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Model TTI-7-R
Precision Digital Thermometer
Operators Handbook
Isotech North America
158 Brentwood Drive, Unit 4
Colchester, VT 05446
Phone: (802)-863-8050
Fax:
(802)-863-8125
www.isotechna.com
sales@isotechna.com

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Summary of Contents for Isotech TTI-7-R

  • Page 1 Model TTI-7-R Precision Digital Thermometer Operators Handbook Isotech North America 158 Brentwood Drive, Unit 4 Colchester, VT 05446 Phone: (802)-863-8050 Fax: (802)-863-8125 www.isotechna.com sales@isotechna.com...
  • Page 2 ENGLISH IMPORTANT SAFETY INFORMATION 22/1/97 GENERAL This instrument has been designed and tested to comply with the Electromagnetic Compatibility Directive 89/336/EEC and Low Voltage Directive 93/68EEC in accordance with EN 6 1 0 1 0 -1 : 1 9 9 5 relating to the safety requirements for electrical equipment for measurement, control and laboratory use.

  • Page 3: Table Of Contents

    1.3.1 PRT measurement ...................1-4 1.3.2 Thermocouple measurement................1-5 1.3.3 Thermocouple reference junction compensation..........1-6 SETTING UP THE TTI-7-R ....................2-1 Safety information......................2-1 Unpacking the instrument..................2-1 Voltage selection and fuse rating................2-2 2.3.1 Setting the Voltage and Fuse Rating..............2-2 ABOUT THE TTI-7-R ......................3-1 The Front Panel ......................3-1...
  • Page 4 5.6.8 Reviewing log statistics .................. 5-24 Setting up the basic controls .................. 5-25 5.7.1 Review system configuration................5-25 5.7.2 Setting up the TTI-7-R ................... 5-26 5.7.3 Configuring the communications interface............5-28 5.7.4 Setting up Trigger Mode................. 5-30 5.7.5 Displaying the firmware version ..............5-31 5.7.6...
  • Page 5 Contents Programming the Interface ..................7-6 7.4.1 Introduction ......................7-6 7.4.2 Command Tree....................7-7 7.4.3 Command Directives ..................7-7 7.4.4 Command Syntax .....................7-8 IEEE-488.2 Common Command Group..............7-10 7.5.1 IEEE-488.2 Common Command Summary.............7-10 7.5.2 IEEE-488.2 Common Commands ..............7-10 Measurement Command Group ................7-14 7.6.1 Measurement command summary..............7-14 7.6.2 CONFigure Commands...................7-14 7.6.3...
  • Page 6 Contents 9.2 Thermocouple measurement.................... 9-1 9.3 Internal battery operation ....................9-2 Supply ........................9-2 Environmental ......................9-2 Data communication interface options ..............9-2 Analogue output option..................... 9-3 Display........................9-3 Physical........................9-3 9.10 Pt100 System accuracy ..................9-3 CLEANING AND MAINTENANCE................... 10-1 10.1 Cleaning ......................

  • Page 7: Introduction

    20 hours mains free operation for remote measurement and data logging applications. The TTI-7-R will operate with any Pt25 (25 Ohm) and all 2, 3 and 4-wire Pt100 (100 Ohm) platinum resistance thermometers as well as most standard international thermocouple types.
  • Page 8 Connection sockets incorporate integral temperature compensation sensors making high accuracy thermocouple measurement possible without the use of an external reference junction. Standard features of the TTI-7-R Precision Thermometer include: • direct temperature measurement display in °C, °F,K; •...

  • Page 9: Definitions And Terminology

    Thermocouples are referred to as a TC element or TC sensor. viii. The TTI-7-R 's thermocouple connection sockets are often referred to as a temperature compensated reference junction. See Section 1.3 for more details. System accuracy refers to the overall, combined accuracy of the TTI-7-R and thermometer.

  • Page 10: Principles Of Measurement

    PRT is not known, accurate temperature measurement is not possible. The TTI-7-R uses PRT calibration data to overcome this problem and calculates temperature from temperature conversion functions stored in internal memory. This method enables the TTI-7-R accurately to convert resistance to temperature, uniquely for each PRT used.

  • Page 11: Thermocouple Measurement

    Introduction 1.3.2 Thermocouple measurement As well as the PRT resistance measurement facility the TTI-7-R also functions as a precision milli-voltmeter. Designed for high accuracy measurement over the EMF voltage range of all standard base and precious metal thermocouples, the TTI-7-R achieves a basic voltage accuracy of better than 3µV...

  • Page 12: Thermocouple Reference Junction Compensation

    1.3.3 Thermocouple reference junction compensation The electrical connection between the thermocouple element and the TTI-7-R input connector is often referred to as the internal reference junction. All standard thermocouple reference functions are defined relative to 0°C. To eliminate the physical need to reproduce this temperature inside the TTI-7-R , the actual connection temperature is accurately measured with an internal PRT.

  • Page 13: Setting Up The Tti-7-R

    AC power fuse is installed. Incorrect voltage or fuse selection present both an electrical safety and a fire hazard. 2.2 Unpacking the instrument When you unpack the TTI-7-R thermometer, check that the following items are present before starting to use the unit: •...

  • Page 14: Voltage Selection And Fuse Rating

    Figure 2.1. Where fused plugs are connected to the AC power cord, the correct fuse rating is 3 Amps. The AC power cord provided with the TTI-7-R is colour coded in accordance with national standards to match the plug type fitted, as follows:...
  • Page 15 Setting up the TTI-7-R Earth (protective conductor) Green Green/Yellow Live Black Brown Neutral White Blue Figure 2.1 - Fused Power Input Unit and Voltage Selector INSERT SCREWDRIVER VOLTAGE SELECT TO LEVER DOOR OPEN PLASTIC CAM FUSE HOLDER Page 2-3...
  • Page 16 Setting up the TTI-7-R This page has been left blank intentionally Page 2-4...

  • Page 17: About The Tti-7-R

    3.2 On/Off switch and internal battery The ON / OFF keys switch the TTI-7-R on and off. During power on all TTI-7-R measurement functions are reset to their default state. It is important to note that THE POWER OFF FUNCTION DOES NOT DISCONNECT THE TTI-7-R FROM THE ELECTRICITY SUPPLY.

  • Page 18: The Function Keypad

    During this first re- charge, it may not be possible to turn on the TTI-7-R . Leave the TTI- 7-R connected to the AC electricity supply for at least 12 hours to allow the batteries to fully re-charge before using the TTI-7-R again.
  • Page 19 About the TTI-7-R Table 3.1 Summary of basic key functions Key symbol Description Function Direct function or Menu Setting up Input Channels Select input Selects and displays Direct channel A0 to A4 measurement channel A0 to A4 from keypad Select input...

  • Page 20: About The Tti-7-R Display

    3.4 About the TTI-7-R Display The liquid crystal graphic display clearly indicates the measured temperature and measurement status as well as displaying available menu options and measurement analysis when selected. Whilst in Temperature Mode (see Section 5.1), there are three possible...
  • Page 21 About the TTI-7-R Figure 3.2 - Main display layout (PRT measurement) A1 Pt100 IEC751 / R0 = 100.000 a=3850 4-wre 18.90 °C Busy Input = +106.591 Ohm LOBAT Zero XXXX/YYYY Figure 3.3 - Main display layout (Thermocouple measurement) A1 TC Type RJ Mode= Internal + 18.90...
  • Page 22 About the TTI-7-R Figure 3.4 -Main display layout (Relative A1-B1 measurement) A1-B1 0 . 1 °C Busy LOBAT XXXX/YYYY Zero The table below describes the location of information as it appears in the various display layouts: Page 3-6...
  • Page 23 About the TTI-7-R Table 3.2 - Measurement mode display features PRT measurement Thermocouple Relative Ch1 - Ch2 Selected channel Selected channel Temperature temperature temperature difference between CM and Ch2 Input channel selected C M - C h 2 Input channel...

  • Page 24: Thermometer Inputs

    However, the TTI-7-R may also be used with an external ice point reference for high precision measurement and calibration work. Page 3-8...

  • Page 25: Rear Panel

    About the TTI-7-R Figure 3.6 - Thermocouple input connection THERMOCOUPLE CONNECTION LOW THERMAL EMF COPPER BANANA (4mm) PLUGS 3.6 Rear panel Figure 3.7 - Rear Panel layout, showing all options RS232or I E E E I E C power Voltage selector...

  • Page 26: Ac Power Input Socket

    3.6.1 AC Power Input Socket Accepts an IEC type power connector. The AC power input unit incorporates a voltage selection tumbler, to enable the user to match the TTI-7-R to the local AC voltage supply, and a power line fuse holder. 3.6.2 Rating plate...

  • Page 27: Measuring Temperature

    4. Measuring Temperature 4.1 Measurement uncertainty and traceability Measurement is usually made on the assumption that there is a true value. Whenever a measurement is performed it is unlikely that the measured value will equal the true value. The difference between the two values is the measurement error which will lie within the specified limits of uncertainty.
  • Page 28 Measuring Temperature Since 1968 when the International Practical Temperature Scale of 1968 (IPTS68) was adopted, there have been significant advances in the techniques employed in establishing temperature standards and in the measurement of thermodynamic temperature. The International Temperature Scale of 1990 (ITS-90) gives practical effect to these improvements.

  • Page 29: Thermocouple Measurement Introduction

    10µV/ °C, which means that high accuracy, high resolution measurements require sensitive instruments such as the TTI-7-R . Base metal thermocouples easily account for the bulk of temperature sensors used today, and offer the advantages of being easy to package into a variety of sensor configurations and relatively low cost.

  • Page 30: Connecting Thermocouples

    TTI-7-R also influence the measurement result. 4.4 PRT measurement The TTI-7-R will operate with either 25 Ohm SPRT’s/PRT’s or a range of 2, 3 and 4-wire 100 Ohm PRTs. The best performance will be achieved only where good quality PRTs are used from reputable, proven sources.
  • Page 31 Callendar van Dusen coefficients. ISOTECH NA Inc. provides a range of proven PRTs especially for use with the TTI-7-R , as well as offering a service to provide customised PRTs to meet individual customers' requirements. High "alpha" PRTs: The best possible system accuracy is achieved using high "alpha"...

  • Page 32: Prt Linearization Functions

    Measuring Temperature 4.4.1 PRT linearization functions The TTI-7-R provides 3 standard and 20 user definable algorithms for converting resistance to temperature. The choice will depend on the type of PRT and its calibration. See also Section 9, which gives PRT sensor information.
  • Page 33 Measuring Temperature IEC751 Selecting IEC751 from the standard menu selects the standard coefficients from IEC751 (DIN43760/ BS1904 -based on IPTS68). The coefficients for IEC751 are as follows: IEC751 100 Ohms 3.90802 x 10 -5.802 x 10 - 4.2735 x 10 EN751 Selecting EN751 from the standard menu selects the standard coefficients from BS EN60751 based on ITS90.
  • Page 34 Measuring Temperature This page has been left blank intentionally Page 4-8...

  • Page 35: Operating The Tti-7-R

    Input = -0.170 mV RJ = +24.62 deg C Busy The keypad below the display screen controls the TTI-7-R . Some keys perform a function directly. For example, pressing changes the temperature units. Other keys switch the display to configuration mode which allows you to select options through a series of menus.
  • Page 36 Operating the TTI-7-R below the main reading. An instruction prompt under the dashed line indicates the current menu. The available menu options are displayed on the bottom row of the display as shown in Figure 5.2. Press the corresponding function key to select an option.

  • Page 37: About Function Keys

    Operating the TTI-7-R 5.2 About function keys You only use the top row of function keys to select menu options. The lower row of function keys are enabled only when entering numerical data; these instances are covered later in this section. Both rows of function keys are shown in Figure 5.3.

  • Page 38: Power-Up Sequence

    On successfully completing the memory self-test the TTI-7-R will report PASSED and proceed with a system configuration check. If the memory self-test fails the TTI-7-R reports the message FAILED Press OK to restore defaults. Figure 5.5 - Memory Self-Test Fail Display Performing Self-Test ..

  • Page 39: System Configuration

    Operating the TTI-7-R 5.3.2 System Configuration On power-up the TTI-7-R performs a system configuration check searching for input channel expansion cards or communication card. The screen displays: Checking system configuration The following information is read from each card on detection and displayed by the system configuration display for 2 seconds.

  • Page 40: Setting Up Measurement Options

    The selected channel number is displayed in the top left hand corner of the display screen. If a channel is selected that is not available the TTI-7-R will display an error message channel not available and prompt for a new channel number.

  • Page 41: Setting Up A Prt Measurement

    A differential measurement can be taken from any two available channels. Select [Quit] to return to the main display. If a channel is selected that is not available the TTI-7-R will display an error message channel not available and prompt for new channel numbers.

  • Page 42: Setting Up A Prt Measurement With User Defined Probe Memories

    Operating the TTI-7-R The TTI-7-R is pre-programmed with three standard linearization standards (see Section 4.4.1) as follows: i. [IEC751] IEC751 (1983) ii. [EN751] BS EN60751 (1992) iII. [US/JIS] JEMIMA To choose one of these linearization standards, press the appropriate function key and then [OK] if you want to go on to configure 3 wire or 4 wire measurement or configure another channel.
  • Page 43 [OK]. The number you have entered is shown on the top line on the display. If you make an error, press USER/OPTN and re- enter number. The TTI-7-R will only accept values in the range 1-20 and will signal an error if your entry is outside this range.

  • Page 44: Setting Up A Prt Measurement: Checking/Editing Probe Memory Co-Eff. Values

    Operating the TTI-7-R 5.4.5 Setting up a PRT measurement: checking/editing probe memory co-eff. values This allows you to assign coefficient values to probe memories or check the values already assigned. Press 3/SENS and if PRT and TC inputs used, the screen requests [PRT] or [TC].

  • Page 45: Selecting Thermocouple Type

    side) and then the number 2. Go to the next page >> to enter the other coefficients. Dp, An, Bn, and Wt as in 6, above. Note: The coefficients entered can be viewed at the top of the screen. Select Ok: Save new coefficients Select Yes.

  • Page 46: Selecting The Reference Junction Compensation Method

    Operating the TTI-7-R 5.4.7 Selecting the reference junction compensation method You can select the reference junction compensation method after selecting the thermocouple type by pressing [OK] instead of [Quit]. The screen displays: RJ mode? Quit OK The menu options list the three reference junction methods...

  • Page 47: Selecting Ext. Ref. Junction Prt Linearization Whose Temperature Is Measured By A Prt Connected To The Same Channel

    Operating the TTI-7-R 5.4.8 Selecting ext. ref. junction PRT linearization whose temperature is measured by a PRT connected to the same channel. The [Ext] menu option allows you to set up an external reference junction whose temperature is measured by a PRT connected to the same channel.

  • Page 48: Selecting Screen Display Options

    0.001 0.01 5.5.3 Selecting relative temperature measurement In Zero mode, the TTI-7-R displays temperature relative to a fixed reference point. Press 5/ZERO to store the current display value; this will be subtracted from all subsequent readings. To cancel Zero mode, either press 5/ZERO again, change the input channel, change the sensor type or turn off the power.

  • Page 49: Using The Measurement Trigger Function [Run/Hold]

    Setting the trigger mode to single shot mode is described in Section 5.6.3. In single shot mode, the TTI-7-R remains in the hold state until you press the 3/TRIG key; it then captures a single measurement reading.
  • Page 50 Operating the TTI-7-R b) Selecting negative measuring current polarity (-I) Press for reversed or negative measuring current polarity. The measurement time is approximately 1.8 seconds per reading for channels A and B, and 3.6 seconds for Ch1-Ch2 relative measurement. c) Selecting average current Press 9/AVE to select automatically alternated dc measuring current polarity switching at a rate of approximately O.SHz.

  • Page 51: Data Logger

    Operating the TTI-7-R 5.6 Data Logger The TTI-7-R is fitted with a very powerful easy to use data logger. The data logger consists of three functions, each function can be used independently, or all three functions can be combined to provide the powerful data logger.

  • Page 52: Configuring The Scanner

    Operating the TTI-7-R 5.6.3 Configuring the Scanner To access the scanning list menu, select [Scan] from the data logger menu. The screen displays: Scanning list is: Off Quit Switching scanner on/off: Scanner OFF is the default state when the instrument is powered up. To switch the scanner ON select one of the scanning lists [SL1] to [SL4].

  • Page 53: Configuring The Timer

    To edit the parameter value select [Edit], the screen display: Cyc=Cont Delay=00:00:00 Rate=00:00:00 Enter the required parameter value directly from the TTI-7-R numerical key-pad and select [OK] to return to the timer edit menu. Errors can be cleared using the front panel key.
  • Page 54 Operating the TTI-7-R Figure 5.8 - Single channel timer flow diagram Figure 5.9 - Multiple channel timer flow diagram Page 5-20...

  • Page 55: Configuring The Data Log Memory

    Operating the TTI-7-R 5.6.5 Configuring the data log memory The TTI-7-R can record up to 4000 readings in none-volatile data log memory. You can analyse this data either while it is being logged, or later, even when the TTI-7-R has been disconnected from the mains.

  • Page 56: Starting The Data Log

    At any point, you can halt data logging by pressing 3/TRIG again, and the Hold message is shown. Logging will also switch to Hold automatically once the TTI-7-R has logged the required number of samples. If the data log is complete i.e. the number of samples taken equals the number of samples specified, logging stops and Hold is displayed.

  • Page 57: Reviewing Log Results

    Operating the TTI-7-R 5.6.7 Reviewing log results You can review logged data at any time, both during the actual logging and after data recording is complete. To review the data logger memory, select [Mem] from the data logger menu. The screen displays:...

  • Page 58: Reviewing Log Statistics

    Operating the TTI-7-R 5.6.8 Reviewing log statistics You can examine a statistical log analysis at any time, both during the actual logging and after data recording is complete. Reviewing statistical analysis will temporarily suspend logging of data. If the input channel is changed during data logging, no statistical analysis report will be displayed.

  • Page 59: Setting Up The Basic Controls

    Operating the TTI-7-R 5.7 Setting up the basic controls You can configure certain settings on the TTI-7-R by pressing This takes you to the options menu. The screen displays: Options? Conf Up Quit The table below gives a summary of all the available options.

  • Page 60: Setting Up The Tti-7-R

    Set the keyboard beeper on/off; • Set the TTI-7-R clock time; • Set the TTI-7-R clock data format; • Set the TTI-7-R clock date. You access each of the options in turn, pressing [OK] to move on to the next option or [Quit] to save the selection and return to the...
  • Page 61 Beeper: At power up the audible beeper key is [On]. To disable it, select the [Off] option. Time setting: The TTI-7-R clock time function is used to identify data in logged records. The screen displays the current time. If you want to change it, select [Chg].

  • Page 62: Configuring The Communications Interface

    [Chg] again and repeating the process. USER/OPTN deletes the entire data entry. 5.7.3 Configuring the communications interface The TTI-7-R can be fitted with one of the following types of communications interface card: 1. RS-232 serial communications interface 2. IEEE-488.2 parallel communications interface.
  • Page 63 Select [Chg] to enable Talk Only mode. At power up, Talk Only Mode is disabled i.e. the interface is in full talk/listen mode. The TTI-7-R will remain in Talk Only Mode until it is switched off or until you select the [Chg] option again from this menu. All incoming serial interface commands are ignored when Talk Only Mode is operating.

  • Page 64: Setting Up Trigger Mode

    Operating the TTI-7-R 5.7.3.2 Configuring the IEEE 488.2 communications interface If an IEEE-488.2 parallel communications interface card is fitted, select the [Rem I/F] option in the main configuration menu. The screen displays: Talk Only Addr Quit OK Select the [Addr] option, the screen displays the current selected IEEE address.

  • Page 65: Displaying The Firmware Version

    You can change the display contrast while in Temperature Measurement Mode. Press and hold down the key or the key until the display is adjusted correctly. Note that display contrast is not reset when the TTI-7-R is switched off. Page 5-31...
  • Page 66 Operating the TTI-7-R This page has been left blank intentionally Page 5-32...

  • Page 67: Calibrating The Tti-7-R

    However drift of reference components will occur with time making periodic re-calibration necessary. We recommend you return your TTI-7-R to an ISOTECH NA service centre for recalibration at least every 12 months. Please contact the ISOTECH NA Technical Services Group for recalibration advice and a quotation.
  • Page 68 Options and accessories This page has been left blank intentionally Page 6-2...

  • Page 69: Communications Interface

    7. Communications Interface 7.1 Introduction The TTI-7-R can be fitted with one of the following types of communications interface card: RS-232 serial communications interface IEEE-488 parallel communications interface The optional communications interface lets you assign remote control of the TTI-7-R to an external computer. The computer can also read the measured value and instrument status.

  • Page 70: Fitting The Interface

    Options and accessories 7.2 Fitting the Interface WARNING: Switch off the instrument and remove the AC power cord before removing the instrument case. ANTI-STATIC PRECAUTIONS MUST BE TAKEN WHILE INSTALLING THE INTERFACE CARD. Remove the six screws holding the top half of the instrument case (see figure 7.1) and lift off vertically, taking care not to stretch or break the ground connection to the case cover (green/yellow wire).

  • Page 71: Overview Of The Rs-232 Serial Interface

    Communications Interface 7.3 Overview of the RS-232 Serial Interface This conforms to specification ANSI/EIA/TIA-232-E-1991 Interface Between Data Terminal Equipment (DTE) and Data Circuit- Terminating Equipment (DCE) employing serial binary data interchange. Signal levels; MARK (logical "1"); -3V to -15V SPACE (logical "0"); +3V to +15V Data is transferred using the TXD (transmit data) and RXD (receive data) lines.

  • Page 72: The Rs-232 Connector

    RTS, CTS) cross over cable is recommended. Three wire connection (TXD, RXD, GND) is not recommended, but may be implemented by connecting RTS and CTS together at the TTI-7-R end. In this case, the DTE must not send characters too Page 7-4...

  • Page 73: Settings

    Communications Interface quickly as this will cause the TTI-7-R receive buffer (4 characters) to overflow, leading to lost data. 7.3.3 RS-232 Settings The RS-232 interface factory settings are: 9600 baud 8 character bits No Parity 1 Start Bit 1 Stop Bit The serial communications data rate can be set from the instrument' s front panel.

  • Page 74: Interface Commands

    Options and accessories 7.3.5 RS-232 Interface Commands SYSTem:REMote Place the TTI-7-R in the remote mode for RS-232 operation. The REM legend on the display indicates that the instrument is under control of the remote interface. The front panel keys will be locked out.

  • Page 75: Command Tree

    Communications Interface 7.4.2 Command Tree Commands are arranged as a hierarchical "tree", similar to the filing system trees found in personal computers. Commands start at the root level and progress down each level in more detail. The complete path must be specified to access the lower level commands.

  • Page 76: Command Syntax

    Options and accessories Common Commands (*) Commands beginning with an asterisk (*) are called common commands and have a precise function as defined by the IEEE- 488.2 standard. All instruments behave in an identical way. These commands are primarily concerned with control, reset, self-test and status.
  • Page 77 Communications Interface Discrete Parameters have limited values e.g. SINGIe, INFinite. Like command keywords they can have long and short forms, upper and lower case. Boolean Parameters have a single binary value. The controller can send OFF or 0, ON or 1, but the instrument response is always 0 or String Parameters contain ASCII characters which are placed between a pair of double quotation marks, i.e."...

  • Page 78: Ieee-488.2 Common Command Group

    Options and accessories 7.5 IEEE-488.2 Common Command Group Common commands are device commands that are common to all devices on the bus. These commands are designated and defined by IEEE-488.2 standard. 7.5.1 IEEE-488.2 Common Command Summary Mnemonic Description *CLS Clears all event registers and error queue. *ESE <NRf>...
  • Page 79 Communications Interface *ESE? Query the Standard Event Enable Register. The instrument returns a decimal value which corresponds to the binary-weighted sum of all bits set in the register. *ESR? Query the Standard Event Register. The instrument returns a decimal value that corresponds to the binary-weighted sum of all bits set in the register.
  • Page 80 Options and accessories Alternatively, the application program may continuously poll the Operation Complete bit using *ESR? *OPC? This command sets the instrument's Operation Complete Query State active. When any in-progress command is complete, the state returns to idle, a '1' is placed in the output queue and therefore the Message Available bit (4) is set..
  • Page 81 Communications Interface *STB? Query the Status Byte Summary Register. The instrument returns a decimal value that corresponds to the binary-weighted sum of all bits set in the register. *TRG Identical to the INITiate command. A single measurement is made. *TST? Always returns '0' to indicate self-test OK.

  • Page 82: Measurement Command Group

    Options and accessories 7.6 Measurement Command Group The measurement command group is used to select channels, configure channel parameters and acquire readings. 7.6.1 Measurement command summary Command Description CONFigure:CHANnel: Select the specified channel. CONFigure? Query the channel configuration. CONFigure:TEMPerature:TC Configure a channel for TC measurement. CONFigure:TEMPerature:RTD Configure a channel for RTD measurement.
  • Page 83 Communications Interface CONFigure? Used to query the current configuration. The response is an ASCII string of either of the following forms: "{channel},TC,{type},{rj mode},{ext rj mode}" {channel} A0, A1 , A2, A3, A4 B0, B1 , B2, B3, B4 Ch1-Ch2 {type} B,C,D,E,J,K,N,R,S,T {rj mode} Off, Int, Ext...
  • Page 84 Options and accessories CONFigure:TEMPerature:TC {type},{rj mode},{ext rj standard} Sets the selected channel for a thermocouple measurement according to the following parameters. {type} B,C,D,E,J,K,N,R,S, {rj mode} Off, Int, Ext For rj mode set to Off or {ext rj standard} For rj mode set to Ext {ext rj standard} (IEC751) (US/JIS)
  • Page 85 Communications Interface Sets the trigger mode to single shot. Selects the channel as specified by the command. Sets the scanner mode to Off. Sets the logging to memory mode to Off. FETCH? Transfer the last reading stored in the instrument's internal memory by the INITiate command to the instrument's output buffer.

  • Page 86: Measure Command

    Options and accessories 7.6.3 MEASure Command These work similar to the CON Figure commands, except that an immediate measurement is performed with the result being sent to the output buffer. MEASure:CHANnel? {channel} Selects the channel to be measured (use CONF:TEMP to configure the measurement parameters).
  • Page 87 Communications Interface Terminates the current measurement cycle and scanning routine. Sets the trigger mode to single shot. Selects the channel as specified by the command. Sets the scanner mode to Off. Sets the logging to memory mode to Off. Initiates a measurement and fetches a single reading. MEASure:TEMPerature:RTD?{type},{standard},{con},{current mode},{root 2} Sets the selected channel for an RTD measurement according to the...

  • Page 88: Sense Command Group

    Options and accessories 7.7 SENSe Command Group The SENSe command group is used to control the instrument measurement parameters. 7.7.1 Sense command summary Command Description SENSe:TEMPerature:UNIT Sets the temperature units to be used. SENSe:TEMPerature:UNIT? Queries the temperature units. SENSe:TEMPerature:RESolution Sets the temperature resolution. SENSe:TEMPerature:RESolution? Queries the temperature resolution.
  • Page 89 Communications Interface SENSe:TEMPerature:RESolution? Queries the temperature resolution. Returns 1, 0.1, 0.01 or 0.001 SENSe:ZERO:AUTO {mode} Turns the auto-zero mode on or off. Default at power-up is auto-zero mode off. {mode} 1, on Auto-zero on 0, off Auto-zero off Auto-zero is only available for single channel measurements. The 'on' mode is automatically reset to 'off if any of the following commands are sent: CONFigure:TEMPerature:TC {type},{rj mode},{ext rj standard}...

  • Page 90: Mathematical Operation Commands

    Options and accessories 7.8 Mathematical Operation Commands The CALCulate:AVERage group of commands performs statistical calculations on the current contents of the data logger memory. A minimum of two readings must be stored otherwise an "execution error" is generated i.e. bit (4) of the Standard Event Register is set. This error is also generated if the log contains inconsistent entries i.e.

  • Page 91: Route Command Group

    Communications Interface 7.9 Route Command Group The ROUTe:SCAN commands are used to control the instruments scanner operation and configure the scanning lists. The instrument can save up to four independent scanning lists in none-volatile memory, each scanning list also retains its individually programmed cycle count, trigger delay time and sample rate.
  • Page 92 Options and accessories ROUTe:SCAN:INTernal <slx>, <scanlist> This command is used to configure the specified scanning lists for the internal scanner cards. <slx> SL1, SL2, SL3, SL4 Select scanning list <scanlist> A0, A1, A2, A3, A4, Set channel active B0, B1, B2, B3, B4 To configure a scanning list specify the scanning list number followed by a list of channels that are required to be active in the list.

  • Page 93: Trigger Command Group

    Communications Interface 7.10 Trigger Command Group The TRIGger and SAMPIe commands are used to control the instruments scanner operation and configure the scanning lists. 7.10.1 Trigger command summary Command Description INITiate Initiate a single measurement. ABORt Abort the current measurement. TRIGger:MODE Sets the trigger mode.
  • Page 94 Options and accessories Terminates the current measurement cycle and scanning routine. Sets the Run/Hold trigger mode to Hold. TRIGgen:MODE <mode> This command is used to set the trigger mode to single or infinite. Setting the trigger mode to single results in a single measurement being taken when triggered.
  • Page 95 Communications Interface Changing a timer cycle count value that is currently in use will result in the instrument terminating the current measurement cycle and scanning routine. Sets the Run/Hold trigger mode to Hold. Sets the timer cycle count to the value as specified by the command.
  • Page 96 Options and accessories <slx> SL1, SL2, SL3, SL4 Specify scan list Returns "00:00:00" to "99:59:59" Timer delay hh:mm:ss. SAMPIe:COUNt? SAMPIe:COUNt? <slx> SAMPIe:COUNt? queries the general timer sample count. The sample count is the same as the general timer sample count. SAMPIe:COUNt? <slx>...

  • Page 97: System Related Commands

    Communications Interface 7.11 System Related Commands The SYSTem commands are used to control the instrument none- measurement global parameters. 7.11.1 System command summary Command Description DISPIay:BACKIight Sets the display back light mode. DISPIay:BACKIight? Queries the display back light mode. SYSTem:BEEPer Sounds a single beep immediately.
  • Page 98 Options and accessories SYSTem:BEEPer:STATe? Query the front-panel beeper mode setting. Returns Front-panel beeper on Front-panel beeper off SYSTem:TIME {hh},{mm},{ss} Set the system calendar/clock time value. The instrument uses the 24 hour clock format. {hh},{mm},{ss} 24 hour clock format SYSTem:TIME? Query the system calendar/clock time value. Returns "hh,mm,ss"...

  • Page 99: Dataiogger Command Group

    Communications Interface 7.12 DATAIogger Command Group This group of commands stores and retrieves measurement values using the data logging memory. This memory is non-volatile and can store up to 4000 readings. 7.12.1 Datalogger command summary Command Description DATAIogger:MODE Sets the data logger mode. DATAIogger:MODE? Queries the data logger mode.
  • Page 100 Options and accessories DATAIogger:STARt The DATAIogger:STARt command like the READ? command is used to Initiate single or multiple readings the readings are sent to the data logger memory but not to the output buffer. DATAIogger:STARt command is only active when DATAIogger:MODE is ON.
  • Page 101 Communications Interface On completion of the scanner routine the next DATAIogger:STEP command will re-set the scanner routine to the beginning and start the next cycle. If the data logger memory is full, any further DATAIogger:STEP commands will generate an "execution error" the command will be ignored.

  • Page 102: Status Reporting Structure And Commands

    Options and accessories 7.13 Status Reporting Structure AND Commands There are five groups of registers involved. The Questionable Data and Operation groups each consist of three registers: Codition Registers The Condition Register contains the current status of the instrument and is continuously updated. The register value can be read at any time using the appropriate query (?) command.

  • Page 103: The Status Reporting System Is Summarised In The Following Diagram

    Communications Interface 7.13.1 The Status Reporting System is summarised in the following diagram. Questionable Data Standard Operation Status Byte Page 7-35...
  • Page 104 Options and accessories The status bits have the following meanings: Temperature Range This bit is set when the last measurement resulted in a computed temperature that was outside the measuring range of the instrument. It is also set when the "crossed wires" condition is detected.
  • Page 105 Communications Interface STATus:QUEStionable:EVENt? Query the Questionable Data Event Register. The instrument returns a binary-weighted decimal value representing the bits set in the event register. STATus:QUEStionable:ENABIe {<enable value>} Enable bits in the Questionable Data Enable Register. The selected bits are then reported to the Status Byte. STATus:QUEStionable:ENABIe? Query the Questionable Data Enable Register.
  • Page 106 Options and accessories *ESE? Query the Standard Event Enable Register. The instrument returns a decimal value which corresponds to the binary-weighted sum of all bits set in the register. *STB? Query the Status Byte Summary Register. The instrument returns a decimal value which corresponds to the binary-weighted sum of all bits set in the register.

  • Page 107: Command Summary

    Communications Interface 7.14 Command Summary IEEE-488.2 Common Commands *CLS *ESE<NRf> *ESE? *ESR? *IDN? *OPC *OPC? *RST *SRE <NRf> *SRE? *STB? *TRG *TST? *WAI Signal Oriented Measurement Commands CONFigure :CHANnel {channel} CONFigure? CONFigure:TEMPerature:TC {type},{rj mode},{ext rj standard} CONFigure:TEMPerature:RTD {type},{standard},{con},{current mode},{root 2} FETCh? READ? MEASure:CHANnel? {channel}...
  • Page 108 Options and accessories Mathematical Operation Commands CALCulate CALCulate:AVERage:MINimum? CALCulate:AVERage:MAXimum? CALCulate:AVERage:AVERage? CALCulate :AVERage :COU Nt? CALCulate:AVERage:PEAK? CALCulate:AVERage:SDEV? CALCulate:LIMit:LOWer {parameter} CALCulate:LIMit:UPPer {parameter} CALCulate:LIMit:LOWer? CALCulate:LIMit:UPPer? Route command summary ROUTe:SCAN:LSELect ROUTe:SCAN:LSELect? ROUTe:SCAN:INTernal ROUTe:SCAN:INTernal? Triggering Commands INITiate ABORT TRIGger:MODE TRIGger:MODE? TRIGger:COUNt TRIGger:COUNt? TRIGger:DELay TRIGger:DELay? SAMPIe:COUNt? SAMPIe:DELay SAMPIe:DELay? System Related Commands...
  • Page 109 Communications Interface SYSTem:TIME? SYSTem:DATE {dd},{mm},{yy} SYSTem:DATE? SYSTem:DATE:FORMat SYSTem:DATE:FORMat? DATAIogger DATAIogger:MODE {off/on} DATAIogger:MODE? DATAIogger:CLEAr DATAIogger:STARt DATAIogger:STOP DATAIogger:STEP DATAIogger:VALue? {<value>/all} DATAIogger:POINts? Status Reporting Commands STATus STATus:QUEStionable:CONDition? STATus:QUEStionable:EVENt? STATus:QUEStionable:ENABIe {<enable value>} STATus:QUEStionable:ENABIe? STATus :PRESet STATus:OPERation:CONDition? STATus:OPERation:EVENt? STATus:OPERation:ENABIe {<enable value>} STATus:OPERation:ENABIe? RS-232 Interface Commands SYSTem:LOCal SYSTem:REMote Page 7-41...

  • Page 110: Analogue Output

    7.15.3 Analogue Output Connection Connection to the analogue output is via an insulated BNC output socket on the rear panel of the TTI-7-R . Connection to peripheral equipment should be made via a suitable twin core, twisted pair screened cable to the instrumentation input amplifier of the peripheral equipment, (see Figure 7.1).

  • Page 111: Options And Accessories

    8. Options and Accessories 8.1 Accessories The following interfaces may be retro-fitted to the TTI-7-R Order Suffix Description TTI-7-R -INT-D RS232C Communications interface TTI-7-R -INT-L IEEE 488 Communications interface The analogue output option must be specified at the time the instrument is ordered from the factory.
  • Page 112 Options and accessories 8.3 Low Temperature PRTs T100-600-1 D T100-250-1 D T100-450-1 D T100-200-1 D T100-450-2 D 100 Ω 100 Ω 100 Ω 100 Ω 100 Ω Alpha 0.00385 <0.00390, typically <0.00390, typically <0.00390, typically <0.00390, typically 0.00385 0.00385 0.00385 0.00385 -50 °C to +600 °C -50 °C to +250 °C...

  • Page 113: Specifications

    9.Specifications 9.1A Pt100 resistance thermometer measurement Pt100 calibration Characterisation BS EN60 751, IEC751, US/JIS(JEMIMA) Resistance measurement range 10 to 460 Ω Pt100 display resolution 0.001°C Resistance measurement uncertainty ± 2.5mΩ @ +20 °C ±2°C) Temperature coefficient (resistance measurement) ± (3ppm of reading/ °C + 0.5mΩ / °C) Long term stability (resistance measurement) ±...

  • Page 114: Internal Battery Operation

    Specifications Primary measurement display units Connection 4mm gold plated shade lug, wine or banana plug. Isothermal thermocouple connection temperature error < ±0.1°C (@ +20°C) plus ±0.01°C per °C ambient deviation from +20°C (over specified operating temperature range) Input impedance >10MΩ Max common and differential mode input voltage ±40VDC, 28Vrms 9.3 Internal battery operation...

  • Page 115: Analogue Output Option

    5.5kg (12.1 Ibs) 9.10 Pt25 and 100 System accuracy System accuracy is the combined accuracy of the TTI-7-R plus the calibration uncertainty of the PRT. Accurate figures for the instrument and system with the range of calibrated PRTs available for the TTI-7-R are shown below.
  • Page 116 Specifications This page has been left blank intentionally Page 9-4...

  • Page 117: Cleaning And Maintenance

    10. Cleaning and Maintenance 10.1 Cleaning Make sure the TTI-7-R is disconnected from the mains supply before cleaning. Clean the outside of the instrument with a soft, clean cloth dampened with mild detergent. Do not allow water to enter the instrument.
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  • Page 119: Service And Warranty

    TTI-7-R equipment and accessories, (unless stated otherwise), are covered by a 24 month warranty for parts and labour from the date of dispatch from ISOTECH NA. This warranty does not include costs incurred in returning the equipment to the factory for repair.
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