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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 
1.

 

String Parameters 

contain ASCII characters which are placed between 

a pair of double quotation marks, i.e."  ".

 

Input Buffer

 

The instrument receives messages into an input buffer and only starts 
executing commands after receipt of a command terminator. The buffer 
can store up to 100 characters including command directives and 
terminator.

 

Sending a new command before the existing command is executed may 
cause unreliable operation. It is advisable to query the Status Byte (*STB) 
to check on the current status of the instrument before sending a new 
command. Sending a command whilst the instrument is transmitting 
(following a ? command) may result in the transmitted response being 
corrupted. It is advisable to wait for the expected response to be 
transmitted before sending a new command.

 

Output Data Format

 

 

Non-reading queries

 

 

<80 ASCII character string

 

Single-reading

 

IEEE

 

SDDDD.DDD(LF)

 

 

RS-232

 

SDDDD.DDD (CR) (LF)

 

Multiple readings

IEEE

SDDDD.DDD, ..... , .. ,(LF)

 

RS-232

 

SDDDD.DDD,  .....  , ..  ,(CR)(LF)

 

Talk Only format

 

 

ChA: SDDDD.DDD degC (or F, K)

 

 

where

 

S= sign (+/-) D = decimal Digit (0-9) 
<CR> = carriage return character 
<LF> = linefeed character

 

The resolution and units will be as set by the last manual or bus 
commands.

 

 Page 

7-9

 

Содержание TTI-7-R

Страница 1: ...el 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 c...

Страница 2: ...ection LIVE CIRCUITS DANGER Do not connect the power supply to or operate t h i s instrument with the protective covers removed Component replacement and internal adjustments must be made by q u a l i...

Страница 3: ...ut the TTI 7 R Display 3 4 3 5 Thermometer inputs 3 8 3 6 Rear panel 3 9 3 6 1 AC Power Input Socket 3 10 3 6 2 Rating plate 3 10 3 6 3 Input channel expansion card 3 10 3 6 4 RS232 IEEE 488 2 Communi...

Страница 4: ...PRT measurement sense current 5 15 5 6 Data Logger 5 17 5 6 1 Data logger functions 5 17 5 6 2 Setting up the data logger 5 17 5 6 3 Configuring the Scanner 5 18 5 6 4 Configuring the Timer 5 19 5 6 5...

Страница 5: ...Command Group 7 23 7 9 1 Route command summary 7 23 7 9 2 Route commands 7 23 7 10 Trigger Command Group 7 25 7 10 1 Trigger command summary 7 25 7 10 2 Trigger commands 7 25 7 11 System Related Comm...

Страница 6: ...n interface options 9 2 9 7 Analogue output option 9 3 9 8 Display 9 3 9 9 Physical 9 3 9 10 Pt100 System accuracy 9 3 10 CLEANING AND MAINTENANCE 10 1 10 1 Cleaning 10 1 10 2 Preventive Maintenance 1...

Страница 7: ...e for automated monitoring and calibration applications internal battery provides up to 20 hours mains free operation for remote measurement and data logging applications The TTI 7 R will operate with...

Страница 8: ...couples B C D E J K N R S T U W 1 to 20 probe coefficients for ITS90 or CVD entered and stored from programming PRT calibrations High Accuracy to 0 01 deg C over 200 to 660 deg C High Resolution 0 001...

Страница 9: ...Resistance Thermometer Pt100 PRT with nominally 100 resistance at 0 C RTD Resistance Temperature Device vii Thermocouples are referred to as a TC element or TC sensor viii The TTI 7 R s thermocouple...

Страница 10: ...from the measurement For PRTs the relationship between resistance and temperature varies slightly from one PRT to another Therefore no matter how accurately the TTI 7 R measures the PRT resistance if...

Страница 11: ...r smaller ranges See Section 9 2 for thermocouple measurement performance details Thermocouple EMFs are converted to temperature using the NIST monograph 175 linearization functions Special types C an...

Страница 12: ...eproduce this temperature inside the TTI 7 R the actual connection temperature is accurately measured with an internal PRT This temperature is converted to an equivalent EMF and added to the actual th...

Страница 13: ...e correct 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...

Страница 14: ...216 264V T315mA 250V AC WARNING DO NOT CONNECT THE POWER CABLE UNTIL THE VOLTAGE AND FUSE RATING OF THE INSTRUMENT HAVE BEEN CHECKED AND CHANGED IF NECESSARY 2 3 1 Setting the Voltage and Fuse Rating...

Страница 15: ...Earth protective conductor Green Green Yellow Live Black Brown Neutral White Blue Figure 2 1 Fused Power Input Unit and Voltage Selector INSERT SCREWDRIVER TO LEVER DOOR OPEN VOLTAGE SELECT PLASTIC CA...

Страница 16: ...Setting up the TTI 7 R This page has been left blank intentionally Page 2 4...

Страница 17: ...ion keys Display Thermometer inputs 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 st...

Страница 18: ...ged LOW BATTERY indication is displayed when the batteries have approximately 10 charge or 50 minutes operating time remaining To extend the battery operation time switch the display backlight off See...

Страница 19: ...T Measurement units Selects measurement display units C F K Direct from keypad RES Measurement display resolution Selects measurement display resolution Thermocouple 0 1 0 01 PRT 0 01 0 001 Direct fro...

Страница 20: ...pad 2 PRT measurement 2 current selection 2 measurement current division reduces measurement current to allow PRT self heating effect to be calculated Direct from keypad Scroll and contrast control Up...

Страница 21: ...R0 100 000 a 3850 4 wre 18 90 C Input 106 591 Ohm Ave XXXX YYYY Figure 3 3 Main display layout Thermocouple measurement A1 TC Type N RJ Mode Internal 18 90 C Input 0 170 mV RJ 24 62 deg C Mem Adr Rem...

Страница 22: ...gure 3 4 Main display layout Relative A1 B1 measurement A1 B1 0 1 C Busy LOBAT Adr XXXX YYYY The table below describes the location of information as it appears in the various display layouts Page 3 6...

Страница 23: ...nce Junction temperature if selected Not used 10 Measurement status Measurement status Measurement status 11 Trigger run hold single condition Trigger run hold single condition Trigger run hold single...

Страница 24: ...cessory Part Number FA ADAP 250 Refer to the Accessory section at the end of this handbook Figure 3 5 PRT input connection configuration PRT CONNECTION 2 WlRE PRT CONNECTION 3 WIRE PRT CONNECTION 4 WI...

Страница 25: ...BANANA 4mm PLUGS 3 6 Rear panel Figure 3 7 Rear Panel layout showing all options PRT expansion module optional Thermocouple expansion module optional RS232or IEEE Communications Interface optional Ana...

Страница 26: ...um power consumption and instrument serial number 3 6 3 Input channel expansion card Optional input channel expansion card slots Blanking plates are fitted if there is no input channel expansion cards...

Страница 27: ...be described in terms of mean variance and standard deviation The uncertainty or precision limit of a particular measurement is characterised by this distribution Traceability is defined as the proper...

Страница 28: ...to reduce the non uniqueness of the scale that is to reduce the differences which occur between different identically calibrated PRTs In particular the calibration of a PRT can no longer be extrapolat...

Страница 29: ...temperature and provides a means by which to measure temperature There are two categories of thermocouple Rare metal Platinum based types Base metal Nickel based Rare metal platinum types are mostly u...

Страница 30: ...uples consist of at least 2 junctions it is important when performing absolute temperature measurement that one of the junctions is referenced to a known temperature The reference junction and voltage...

Страница 31: ...temperature the temperature coefficient As impurities already exist in the platinum resistance wire additional contamination has a reduced effect and hence low PRTs are more immune to contamination an...

Страница 32: ...BS EN60751 ITS 90 standard US JIS used for un calibrated industrial PRTs with 0 003916 alpha value to provide a conversion of resistance to temperature in accordance with the JEMIMA standard Un calib...

Страница 33: ...EN60751 are as follows Ro A B C EN60751 100 Ohms 3 9083 x 10 3 5 775 x 10 7 4 183 x 10 12 US JIS Selecting US JIS from the standard menu selects the standard coefficients from JEMIMA for high alpha PR...

Страница 34: ...Measuring Temperature This page has been left blank intentionally Page 4 8...

Страница 35: ...in this example an N type thermocouple is connected to input socket A1 and the internal reference junction method has been selected The temperature reading is displayed in degrees Celsius Figure 5 1...

Страница 36: ...ure 5 2 Press the corresponding function key to select an option Figure 5 2 Example of Configuration Mode screen A1 TC Type N RJ Mode Internal Sensor Type T C PRT Quit Indicates current menu Indicates...

Страница 37: ...ode screen Use the OK key to confirm a particular choice and continue to the next set of menu options Not all function keys are used to access the Configuration Mode Some just invoke the function whic...

Страница 38: ...memory self test routine Figure 5 4 Memory Self Test Display Performing Self Test On successfully completing the memory self test the TTI 7 R will report PASSED and proceed with a system configuration...

Страница 39: ...for 2 seconds Communication card RS 232 Baud rate Character bits Parity Start bit Stop bit IEEE488 2 Address Input channel expansion card Card ID Serial Number Card type Channel numbers Figure 5 6 Ex...

Страница 40: ...from the TTI 7 R function keypad at the A or B prompt Select Quit to return to the main display The selected channel number is displayed in the top left hand corner of the display screen If a channel...

Страница 41: ...vailable In addition 20 user definable memories are available for coefficients provided with calibrated probes These memories allow calibration coefficients to be stored in the Callendar van Dusen for...

Страница 42: ...ou want select 4 wire measurement when using 2 wire PRTs 6 Select Quit to return to Temperature Measurement Mode 7 To configure all the channels of an expansion card to the same set up select one of t...

Страница 43: ...1 and 20 using the numbers on the keypad and then 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...

Страница 44: ...coefficients are displayed at the top of the screen These cannot be altered 3 If you want to enter a new set of coefficients press User in Standard screen above The screen requests a probe coefficient...

Страница 45: ...s shipped This lets you obtain sensible results from the onset you can go back and edit the probe coefficients at a later date not necessarily at the time you select them 5 4 6 Selecting thermocouple...

Страница 46: ...nnection with no external reference junction High accuracy measurement requiring no additional connection reference junctions Ext External reference junction compensation using PRT measurement of refe...

Страница 47: ...sed with uncalibrated probes A fourth option Usr gives you access to the 20 probe memories for Callendar van Dusen coefficients provided with calibrated probes 3 If you want to select one of the stand...

Страница 48: ...solution modes available The table below gives the display resolutions for thermocouple and PRT inputs The TTI 7 R defaults to low resolution mode when first switched on High Low Thermocouple 0 01 0 1...

Страница 49: ...ng 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 rea...

Страница 50: ...e measurement The Average current mode is the power up default condition d Selecting 2 current multiplier This option reduces current through the probes by 2 half power to determine any probe self hea...

Страница 51: ...cycle delay sample rate and cycle count Each scanning list can be quickly set up reviewed and edited Timer The built in timer can be programmed to control the cycle delay sample rate and the cycle co...

Страница 52: ...g list menu The screen displays Scanning list edit SL1 AD BO A1 A2 A3 A4 B1 B2 Add Del Quit OK The scanning list edit menu can display up to eight channels on each page at a time only available channe...

Страница 53: ...options to position the flashing cursor over the appropriate parameter to edit To set a parameter to its default value select Clear To edit the parameter value select Edit the screen display Cyc Cont...

Страница 54: ...Figure 5 8 Single channel timer flow diagram Figure 5 9 Multiple channel timer flow diagram Page 5 20 Operating the TTI 7 R...

Страница 55: ...the equipment is powered up To switch on data logging select On Select Off to switch off data logging The screen message reflects the current data logging status e g Memory is OFF Memory is ON Cleari...

Страница 56: ...se with each sample taken 2 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...

Страница 57: ...he logging sequence Ch Indicates the measurement channel Temp cleg Stored temperature value Date Date temperature reading stored dd mm yy format Time Time temperature reading stored mm hh ss format 2...

Страница 58: ...values in the selected measurement units and reports the following statistical information Number of samples Indicates the number of log samples analysed Min Minimum temperature value of the logged d...

Страница 59: ...de lf lEEE488 2 remote interface card fitted Set IEEE address Trg Select Trigger mode to Run Hold or single shot Ver Review Model number Firmware version number 5 7 1 Review system configuration On po...

Страница 60: ...1 Press Set Up in the menu This allows you to Switch the display backlight on off 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 dat...

Страница 61: ...current time If you want to change it select Chg Time is 07 00 32 Chg Quit OK Enter the new time as a sequence of six digits in the format Hour Minute Seconds using the 24 hour time format Then selec...

Страница 62: ...ns interface lets you assign remote control of the TTI 7 R to an external computer 5 7 3 1 Configuring the RS232 communications interface If an RS232 serial communications interface card is fitted sel...

Страница 63: ...is setting Enter new Baud rate Quit OK The RS232 communications interface serial rate data transfer options are 75 110 150 300 600 1200 2400 4800 9600 19200 baud The factory default value is 9600 baud...

Страница 64: ...the new address from the function key pad Addresses in the range 0 to 30 are valid addresses The default factory set address is 7 5 7 4 Setting up Trigger Mode There are two trigger modes available t...

Страница 65: ...ct Ver from the configuration menu to display details about the TTI 7 R The screen displays Model TTI 7 R Version 4 0 16 12 97 Quit OK Instrument Model number Firmware version reference Firmware issue...

Страница 66: ...This page has been left blank intentionally Page 5 32 Operating the TTI 7 R...

Страница 67: ...uivalent to 15 mK with a Pt100 PRT 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 cen...

Страница 68: ...Options and accessories This page has been left blank intentionally Page 6 2...

Страница 69: ...communications interface to log data directly to a serial printer See Section 5 5 2 for further details The cards plug directly into the instrument s main PCB assembly with the interface connector ac...

Страница 70: ...en yellow wire 2 Remove the two screws holding the communications interface blanking plate located on the rear panel 3 IEEE only Remove the four screws holding the rear panel to allow the interface ou...

Страница 71: ...be lost As soon as space becomes available in the receiver buffer RTS is re asserted to allow the PC to send the next character When the instrument detects receipt of a command terminator character R...

Страница 72: ...nector 9 Pin Connector Function 9 Pin Connector Function 3 2 Rx 3 Tx 2 3 Tx 2 Rx 7 5 GND 5 GND DSR 6 4 6 7 RTS 8 CTS 5 8 CTS 7 RTS Pins must be linked To make an RS232 connection use fully screened ca...

Страница 73: ...Mode At power up the instrument defaults to Talk Listen Mode Talk Only Mode In Talk Only Mode the interface ignores all incoming interface commands and the instrument remains in Local control mode Th...

Страница 74: ...ument to the Local mode from RS 232 operation All keys on the front panel are fully functional This is the default at power up 7 4 Programming the Interface 7 4 1 Introduction All interfaces are progr...

Страница 75: ...n recognised character and the command error bit 5 of the Standard Event Register is set Whitespace TAB or SPACE A whitespace character must be used to separate the first parameter from a command keyw...

Страница 76: ...racter sent is also treated as a message terminator Message termination always forces the command path back to the root level ready for the next command message 7 4 4 Command Syntax Most command keywo...

Страница 77: ...ing a new command before the existing command is executed may cause unreliable operation It is advisable to query the Status Byte STB to check on the current status of the instrument before sending a...

Страница 78: ...dard Event Status Register after all pending commands have been executed OPC Places an ASCII 1 into the output queue when all Pending selected device operations have been complete RST Return the instr...

Страница 79: ...the instrument s Operation Complete Command State active When any in progress command is complete the state returns to idle and the Operation Complete bit 0 is set The command should only be used in...

Страница 80: ...a service request on completion of the logging function The following command sequence can be used SRE 16 Enables Message Available bit to trigger a service request CLS Clears the Message Available bi...

Страница 81: ...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 WAI This command is accepted but ignored as all co...

Страница 82: ...EMPerature TC Configure a channel for TC measurement Initiate a measurement and fetch a reading MEASure TEMPerature RTD Configure a channel for RTD measurement Initiate a measurement and fetch a readi...

Страница 83: ...T rj mode Off Int Ext For rj mode set to Off or Int ext rj standard 0 For rj mode set to Ext ext rj standard 1 IEC751 2 US JIS 3 EN60751 4 23 User Probe 1 20 channel RTD type standard con current mode...

Страница 84: ...to 0 otherwise the command is not recognised Terminates the current measurement cycle and scanning routine Sets the trigger mode to single shot Selects the channel as specified by the command Sets th...

Страница 85: ...ry by the INITiate command to the instrument s output buffer After reading the memory is cleared and further FETCh commands do not return anything until a fresh INITiate command is sent READ A measure...

Страница 86: ...l as specified by the command Sets the scanner mode to Off Sets the logging to memory mode to Off Initiates a single measurement and fetches a single reading MEASure TEMPerature TC type rj mode ext rj...

Страница 87: ...he selected channel for an RTD measurement according to the following parameters type Pt100 standard 1 IEC751 2 US JIS 3 EN60751 4 23 User Probe 1 20 con 3 4 3 or 4 wire connectivity current mode I I...

Страница 88: ...solution SENSe ZERO AUTO Sets the auto zero measurement mode SENSeZERO AUTO Queries the auto zero measurement mode 7 7 2 Sense Commands SENSe TEMPerature UNIT parameter Sets the temperature units to b...

Страница 89: ...e is automatically reset to off if any of the following commands are sent CONFigure TEMPerature TC type rj mode ext rj standard CONFigure TEMPerature RTD type standard con current mode root 2 CONFigur...

Страница 90: ...he average stored temperature CALCulate AVERage COUNt Queries the number of stored readings CALCulate AVERage PEAK Queries the peak to peak value CALCulate AVERage SDEV Queries the standard deviation...

Страница 91: ...nal Queries the specified internal scan list 7 9 2 Route commands ROUTe SCAN LSELect slx This command is used to set the scanner mode and select the scan list the scanner is enabled by selecting a sca...

Страница 92: ...the command will be ignored To query a scanning list use the ROUTe SCAN INT slx command Configuring a scanning list that is in use will result in the instrument terminating the current measurement cy...

Страница 93: ...count SAMPIe DELay Sets the specified timer sample delay SAMPIe DELay Queries the specified timer sample delay 7 10 2 Trigger commands INITiate This command is used to Initiate a single measurement w...

Страница 94: ...t trigger mode INFinite Infinite trigger mode Run Hold Terminates the current measurement cycle and scanning routine Sets the trigger mode to the state as defined by the command when set to infinite m...

Страница 95: ...ue CONT Cycle count continuos TRIGger DELay hh mm ss TRIGgen DELay slx hh mm ss The TRIGger DELay hh mm ss command is used to set the required general timer cycle delay time The TRIGger COUNt slx hh m...

Страница 96: ...sample count will be limited to a maximum of 4000 samples or the amount of available data logging memory SAMPIe DELay slx hh mm ss This command is used to set the specified scanning list timer sample...

Страница 97: ...em DATE Sets the internal clock date SYSTem DATE Queries the internal clock date SYSTem DATE FORMat Sets the internal clock date format SYSTem DATE FORMat Queries the internal clock date format 7 11 2...

Страница 98: ...lock time value Returns hh mm ss 24 hour clock format SYSTem DATE FORMat format Set the system calendar clock date format for use in date and time stamping of data logging format dd mm yy mm dd yy SYS...

Страница 99: ...f readings from data log memory DATAIogger POINts Queries the number of readings stored in the data log memory 7 12 2 Datalogger commands DATAIogger MODE mode Turns data logging to memory on or off mo...

Страница 100: ...scanner mode is On DATAIogger STOP The DATAIogger STOP command performs the same function as the ABORt command terminating the current measurement cycle and clearing the input and output buffers DATA...

Страница 101: ...e shot Initiates a single measurement and stores the result in the next location of the data logger memory DATAIogger VALue value Transfers a specified number of data logger reading from the memory to...

Страница 102: ...priate bit in the Status Byte Setting an enable bit to 1 enables the event bit clearing the enable bit inhibits the corresponding event bit The register value can be read at any time using the appropr...

Страница 103: ...Communications Interface 7 13 1 The Status Reporting System is summarised in the following diagram Questionable Data Status Byte Page 7 35 Standard Operation...

Страница 104: ...This could be an invalid command parameter or syntax The command is ignored Measuring This bit is set when a new measurement starts and is cleared when complete It corresponds to the BUSY legend on t...

Страница 105: ...ighted decimal value representing the bits set in the condition register STATus OPERation EVENt Query the Operation Event Register The instrument returns a binary weighted decimal value representing t...

Страница 106: ...ch 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...

Страница 107: ...ure TC type rj mode ext rj standard CONFigure TEMPerature RTD type standard con current mode root 2 FETCh READ MEASure CHANnel channel MEASure TEMPerature TC type rj mode ext rj standard MEASure TEMPe...

Страница 108: ...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 MOD...

Страница 109: ...P DATAIogger STEP DATAIogger VALue value all DATAIogger POINts Status Reporting Commands STATus STATus QUEStionable CONDition STATus QUEStionable EVENt STATus QUEStionable ENABIe enable value STATus Q...

Страница 110: ...ivity 1 mV C Analogue Output range 2V F S 7 15 2 Default Settings On power up the TTI 7 R will initialise with the following settings Measurement units deg C Measurement PRT Input PRT Input A Resoluti...

Страница 111: ...t the time the instrument is ordered from the factory It is not possible to retro fit the analogue output option Other options available for the TTI 7 R include Part Number Description TTI 7 R DP DIN...

Страница 112: ...pically 0 00385 0 00390 typically 0 00385 0 00390 typically 0 00385 0 00385 Range 50 C to 600 C 50 C to 250 C 70 C to 450 C 50 C to 200 C 100 C to 450 C Sheath Fused Silica Stainless Steel Stainless S...

Страница 113: ...C 0 01 C Pt25 sense current 1 mA DC polarity switchable 9 2 Thermocouple measurement Thermocouple types supported J K N E C D T B R S Thermocouple display resolution 0 01 C Voltage measurement uncert...

Страница 114: ...charged 20 hours no backlight 80 hours backlight on Battery recharge time 4hours 9 4 Supply Mains supply voltage range selection 1 90 110V 100Vac 2 108 132V 120Vac 3 198 244V 220Vac 4 216 264V 240Vac...

Страница 115: ...bs 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 o...

Страница 116: ...Specifications This page has been left blank intentionally Page 9 4...

Страница 117: ...r to enter the instrument WARNING Never use alcohol or thinners as these will damage the instrument Never use a hard or abrasive brush 10 2 Preventive Maintenance WARNING Inspect the mains supply cabl...

Страница 118: ...Communications Interface This page has been left blank intentionally Page 10 2...

Страница 119: ...nt to the factory for repair 11 1 Technical Support For all technical support repair warranty and service inquiries please contact 11 2 Returned Instruments All returned goods should be sent carriage...

Страница 120: ...This page has been left blank intentionally Page 11 2...

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