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NOMEX

Technical Manual - Technical Specifications

D909.131.00/02 en

83

Technical Manual

14 Technical Specifications

Only values with specified tolerances or limits are guaranteed. Values without tolerances are for informa-
tional purposes only.

14.1 NOMEX Multimeter

Device designation

NOMEX multimeter, type T11049 with
NOMEX software S030008

Manufacturer

PTW-Freiburg

Intended use

– diagnostic dosimetry system according to IEC 61674 for

absolute dosimetry and quality control measurements in X-
ray diagnostic radiology

– for acceptance testing and constancy checks in radiogra-

phy, fluoroscopy, dental X-ray, mammography, and com-
puted tomography (CT) applications

Operation mode

continuous operation

Measuring principle

measurement of the tube voltage of an X-ray unit, using semi-
conductor detectors and the dual-filter method

Measured quantities and units

dose [Gy] and dose rate [Gy/s]
exposure [R] and exposure rate [R/s]
dose per pulse [Gy/pulse] or [R/pulse]
pulses
pulse frequency [Hz]
exposure time [s]
mean peak voltage [kV], maximum peak voltage [kV] and
practical peak voltage [kV]
total filtration [mm Al]
half value layer [mm Al]
tube voltage waveform
dose rate waveform

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Содержание NOMEX L981815

Страница 1: ...131 00 02 en 2012 07 Ext Sa User Manual NOMEX NOMEX Multimeter T11049 Firmware Version 1 1 or higher NOMEX Software S030008 Version 1 1 or higher Contents Operating Manual Technical Manual Service Ma...

Страница 2: ...om other manufacturers are used PTW Freiburg cannot be held liable for dam age resulting from the use of accessories or consumables from other manufacturers or when the user ignores the instructions a...

Страница 3: ...e with a quality management system that is contin uously updated according to the national and international standards PTW FREIBURG Physikalisch Technische Werkst tten Dr Pychlau GmbH L rracher Str 7...

Страница 4: ...re Requirements 20 2 2 Installation 21 2 3 Repairing and Uninstalling 22 2 4 Data Backup and Restoring a Backup 23 2 5 Storage of Data 23 2 6 Starting 24 2 7 Exiting 24 3 Putting the NOMEX Multimeter...

Страница 5: ...easurement Data 66 10 NOMEX Software Options 67 10 1 Selecting the Displayed Values 67 10 2 Demo Mode 68 10 3 Waveform Storage Options 68 10 4 Measuring Table Options 69 11 Error Messages and Erroneou...

Страница 6: ...131 00 02 en Service Manual 89 16 Cleaning 89 17 Preventive Maintenance 90 18 Repairing Legally Calibrated Dosemeters 91 19 Disposal of the Product 92 Literature 93 Appendix China Electronic Industry...

Страница 7: ...TF for measuring the tube voltage dose and half value layer in sensitivity mode Normal or for measuring the dose in sensitivity mode Heavily Filtered 48 Figure 18 Measurable combinations of kV and TF...

Страница 8: ...exposure time tube voltage total filtration and half value layer as well as kV and dose rate wave forms System Components The NOMEX multimeter set L981815 includes these components NOMEX multimeter T...

Страница 9: ...or injury or product property damage NOTE Provides application tips or other useful infor mation to ensure that you get the most from your equipment Safety Information for the NOMEX System Strictly ob...

Страница 10: ...rect working order and operating condition Before putting the product into operation visually inspect all connection cables con nectors housing and covers for signs of damage Damaged cables and connec...

Страница 11: ...t be used to control radiodiagnostic equipment or radiotherapy units WARNING Electricity is a source of risk particularly when the product is operated inappropriately Shock Hazard Use of peripheral de...

Страница 12: ...efore use The use of cables longer than specified may impair the electromagnetic compatibil ity characteristics of the product The product should not be used in the immediate vicinity of or placed on...

Страница 13: ...er is a highly sensitive multi channel semiconductor detector For this reason cosmic radiation as well as moving the NOMEX multimeter are capable of starting a measurement CAUTION Improper handling of...

Страница 14: ...plug Figure 1 Definition of the patient environment Symbols on the Product and Nameplate Symbol Description Please refer to the user manual The product bears the CE mark The device is only suitable fo...

Страница 15: ...according to different standards evaluation and plausibility check of measur ing and analysis data provided by the soft ware introduction of the software in the depart ment as well as the instruction...

Страница 16: ...not in a position to guarantee that the program is completely free of errors PTW Freiburg is not responsible in any way for the consequences resulting from the use of the NOMEX software Any conclusion...

Страница 17: ...curacy of the measured value is inadequate auto start auto stop mode with auto reset USB interface powered via USB interface NOMEX software for the display and evalua tion of the measured values NOMEX...

Страница 18: ...18 D909 131 00 02 en 1 2 Indicators and Interfaces of the NOMEX Multimeter Figure 2 NOMEX multimeter top view 1 Radiation measurement area refer to Figure 4 2 USB port 3 Status LED Figure 3 NOMEX mult...

Страница 19: ...The NOMEX multimeter is inactive i e it is not con nected to the PC and there fore is not powered none Establishing a communication link via USB illuminated blue The NOMEX multimeter is ready for mea...

Страница 20: ...processor recommended Pentium IV processor 3 GHz or better RAM min 2 GB RAM Hard disk min 100 MB of free space for NOMEX and min 300 MB of free space for NET Framework 2 0 and 3 5 Graphics XGA 1024 x...

Страница 21: ...Start Windows on your PC and close all run ning applications Insert the installation CD into the CD ROM drive e g drive D If you have configured your CD ROM drive to Autorun the installation process...

Страница 22: ...default directory C Program Files Click the Change button to select another direc tory Confirm with OK The target directory will be cre ated if it does not exist yet Click the Next button and in the...

Страница 23: ...ns rather than Cut and Paste 2 5 Storage of Data When you store data please keep in mind that you write them only to completely accessible directories Otherwise Windows Vista and Win dows 7 will store...

Страница 24: ...layed 2 7 Exiting Exiting the NOMEX software can be done in sev eral different ways Click menu File Exit or Press the standard Windows hot key sequence Alt F4 or Double click the program icon in the t...

Страница 25: ...onnect the NOMEX multimeter USB port 4 Figure 2 to a USB port of the PC where the NOMEX software has been installed To do so use one of the supplied USB cables USB cable L178089 or USB active extensio...

Страница 26: ...is started this can lead to communication problems between the NOMEX software and the NOMEX multimeter In this case exit and restart the NOMEX software so that the USB connection will be detected aga...

Страница 27: ...positioned vertically above the NOMEX multimeter The NOMEX multimeter always needs to be positioned in a permanently irradiated area A rotating field of radiation will lead to erroneous measurements M...

Страница 28: ...tion With this type of equipment it must also be assured that the NOMEX multimeter is always fully irradiated statically when the rotation cannot be avoided i e the NOMEX multimeter must fol low the r...

Страница 29: ...ement Ranging 6 Perform the measurement Auto start auto stop mode measurement starts when a signal is detected measurement ends when no signal is detected Manually start stop measurement Start measure...

Страница 30: ...X Software Mea suring Window 5 Selected highlighted measurement in the measuring table 6 Selected highlighted column in the measur ing table 7 Main data window with measuring table 8 Statistical evalu...

Страница 31: ...dow of the NOMEX multimeter refer to section 5 1 NOMEX Software Mea suring Window 5 Main data window with waveform 6 Current position of the crosshairs 7 Measured value corresponding to the current po...

Страница 32: ...perimpose other programs 5 1 NOMEX Software Measuring Window Measuring Mode Figure 12 NOMEX multimeter measuring win dow in the NOMEX software 1 Status line with a current application and current sens...

Страница 33: ...ion The NOMEX multimeter is inactive i e it is not con nected to the PC and there fore is not powered none Establishing a communication link via USB illuminated blue The NOMEX multimeter is ready for...

Страница 34: ...play previous measurement Display tube voltage waveform graph Display dose rate waveform graph Enlarge a section of the waveform graph Resize waveform graph to standard size Export waveform data or se...

Страница 35: ...nd detector informa tion 5 2 4 Explanation of the Setup Menu Icons Submenu exists Menu item selected and submenu exists Parameter or option selected Parameter or option not selected Application config...

Страница 36: ...easurement manually Display and audio menu Language Introduction Intro Beep Icons on Legally Calibrated Devices NOMEX multimeter is legally calibrated RAD FLU DENT application is legally calibrated RA...

Страница 37: ...Error Messages 5 3 Context Menu Context menus are available for important and special functions Context menus are activated with a right mouse click The program offers dif ferent context menus for th...

Страница 38: ...tage mean kVp The mean kVp corresponds to the mean value of the upper 10 of the highest measured tube voltages maximum peak voltage maximum kVp The maximum kVp corresponds to the highest measured tube...

Страница 39: ...otation To choose this presentation select context menu Value presentation Technical nota tion Presentation with unit prefix To choose this presentation select context menu Value presentation Value wi...

Страница 40: ...ettings user interface settings e g the language All these settings are stored in the non volatile memory of the NOMEX multimeter which means they are retained even when the device is switched off Upo...

Страница 41: ...new value or Doubleclick the setting you want to change The background of the value turns blue Enter the new value 6 1 1 2 Selecting Values from a Dropdown List Figure 14 Example showing the sampling...

Страница 42: ...r information 6 2 1 Selecting the Application The Multimeter Application menu will be dis played Click the application that you want to select RAD FLU DENT CT DENT PAN MAM The selected application wil...

Страница 43: ...ector informa tion button The following calibration and detector information will be displayed device manufacturer device name type number of the device serial number of the device device model calibr...

Страница 44: ...vity mode in the corre sponding submenu Normal High Heavily Filtered Timer settings in the corresponding submenu Measurement sampling Start delay delay before measurement starts Stop delay delay befor...

Страница 45: ...ended for measuring low dose rates 5 Gy s at direct current high frequency tube voltages DC HF and heavily filtered radiation qualities TF 1 mm Cu The recommended min imum measuring time is 5 seconds...

Страница 46: ...ng time of 3000 s at a sampling rate of 2 Hz For the storage of the entire exposure time the sampling time must be longer than the exposure time Select a sampling rate that results in an exposure time...

Страница 47: ...ws the total dose of multiple radiation pulses with long intervals to be measured 6 3 5 kV Range The following settings are available for the kV range tube voltage range automatic adjustment of the kV...

Страница 48: ...e gray area is the range that is defined by PTW for measuring the tube voltage dose and half value layer It is also possible to perform measurements in the hatched areas In this case however the measu...

Страница 49: ...ing table and on the measuring window The color gray indicates that the total filtration is not a measured value but rather a set value The set total filtration value is also displayed in the sta tus...

Страница 50: ...NOMEX Operating Manual NOMEX Multimeter Setup 50 D909 131 00 02 en Figure 18 Measurable combinations of kV and TF for measuring the total filtration...

Страница 51: ...Stop option the Zeroing button will be hid den in sensitivity mode Normal Thus zeroing manually is no longer possi ble in this mode For further informa tion refer to section 7 3 4 Zero Adjust ment Au...

Страница 52: ...he introduction enabling or disabling the audio signal beep 6 4 1 Language The menus dialogs and messages can be displayed in different languages The following languages can be selected German English...

Страница 53: ...results possible the dose rate selected on the X ray unit should not be too small The NOMEX software does not require any special settings because the NOMEX multimeter automatically selects the optima...

Страница 54: ...ity mode set in the NOMEX soft ware matches the dose rate to check 6 The sampling rate set in the NOMEX software matches the desired storage time 7 In case of excessive voltage or current a start dela...

Страница 55: ...option in the Measure ment menu is enabled a measurement can also be started by clicking the Start measurement button on the measuring window 7 3 2 Readouts During the Measurement The display is upda...

Страница 56: ...justment You can also initiate the zero adjustment during a running measurement This however will abort the measurement 7 3 5 Readouts at End of Measurement After the termination of the measurement th...

Страница 57: ...HVL 2 X X X X Total filtration TF 2 X X X Dose per pulse X X X Pulse frequency X X X Pulses X X X Tube voltage waveform 2 3 X X X X Dose rate waveform 3 X X X X Table 1 Available measurement data in s...

Страница 58: ...e required due to the dead times resulting from range switching In this case the measuring amplifier range that was used last will be retained for subsequent measurements because NOMEX assumes constan...

Страница 59: ...for the following parameters mean peak voltage mean kVp maximum peak voltage maximum kVp practical peak voltage PPV half value layer HVL tube voltage waveform dose rate waveform With the maximum samp...

Страница 60: ...values is inde pendent of the memory The measured values are determined over the entire exposure time The values of mean peak voltage mean kVp maximum peak voltage maximum kVp and practical peak volta...

Страница 61: ...ata window either the current measurement will be highlighted in the mea suring table or the waveform graph of the cur rent message will be displayed The measuring window will show the mea sured value...

Страница 62: ...line of the measuring window will be grayed out The current settings will be preserved and you can still perform measurements with these settings When you perform a new measurement it will be appended...

Страница 63: ...uage Microsoft Excel how ever uses the language of the operating system If possible set NOMEX to the language of the operating system 8 1 1 Exporting All Measurement Data Select menu File Export all I...

Страница 64: ...8 2 Copying Measurement Data The NOMEX software allows you to copy mea surement data to the clipboard From the clip board the data can be pasted to another program e g a spreadsheet program or an edit...

Страница 65: ...Copy selected values The selected measured values are copied to the clipboard 8 2 2 Copying the Measured Values of the Displayed Waveform Condition The waveform to copy is displayed in the main data...

Страница 66: ...a for the printout or the print preview Select the output format for the printout or the preview from the list box NOTE If you select an output format for which no appli cation is installed on the PC...

Страница 67: ...fault set tings of the currently displayed tab 10 1 Selecting the Displayed Values Figure 23 Options dialog Displayed values tab On the Displayed values tab you can select the values to be displayed o...

Страница 68: ...no NOMEX multimeter is connected In demo mode there is no communication with the NOMEX multimeter The NOMEX software simu lates the measurement You can choose to simulate a legally calibrated applica...

Страница 69: ...ll find the following options In the Value presentation pane you determine the display format of values as they are shown in the measuring table Presentation in technical notation Presentation with un...

Страница 70: ...viated If the determination of the measured values is not possible for specific measured quantities the measured values of the quantities concerned will be replaced by Example The exposure time is too...

Страница 71: ...rate detected Dose rate Dose Dose per pulse NOMEX is in a high measuring range refer also to section 7 3 5 1 Measurements with Very Short Exposure Times The dose rate is too low for this mea suring r...

Страница 72: ...ect kV auto ranging Tube voltage too low The tube voltage is too small Increase the tube voltage Select kV auto ranging Exposure time too short Tube voltage Total filtration Half value layer The expos...

Страница 73: ...d the OK button proceed as follows Switch the NOMEX multimeter off and on again by removing and reconnecting the USB cable If the error message recurs immediately or after the next measurement please...

Страница 74: ...tory default blinking red with OK but ton NOMEX has identified a cor rupted software data set After confirmation with the OK button the software data set will be reset to the default values Communicat...

Страница 75: ...ray tube s roughness may increase with age and utilization This leads to additional filtration that must be taken into account when setting the total filtra tion at the NOMEX multimeter The NOMEX mul...

Страница 76: ...sensitivity mode Normal The sensitivity mode High is intended for measuring low dose rates at DC HF tube voltages The recommended mini mum measuring time is 5 seconds The measurement exhibits an extre...

Страница 77: ...the following color schemes These schemes are recom mended by PTW Windows Classic Windows Standard 2 Windows Vista Business Select Start Control Panel Appearance and Personalization Per sonalization...

Страница 78: ...r Holder T20016 The NOMEX Multimeter Holder T20016 includes these components Figure 31 NOMEX multimeter holder T20016 with NOMEX multimeter 1 NOMEX multimeter 2 Holder 3 Slot for Velcro fasteners 2 pi...

Страница 79: ...he USB cable into the strain relief 5 Installing the Holder at the Image Receptor of the Dental Panoramic Unit Guide a Velcro fastener 9 through the slots 3 at the holder 2 Adapt the length of the Vel...

Страница 80: ...Adapter T20017 The NOMEX Multimeter Cassette Adapter T20017 includes these components Figure 32 NOMEX multimeter cassette adapter T20017 with NOMEX multimeter 1 Cutout for USB cable from NOMEX multime...

Страница 81: ...on the X ray unit to test Pull back the appropriate locking bar 4 Slip the cable side of the NOMEX multime ter 3 under the required stop 2 or 7 and deposit it on the frame 5 The measurement area must...

Страница 82: ...NOMEX Operating Manual NOMEX Multimeter Accessories 82 D909 131 00 02 en...

Страница 83: ...easurements in X ray diagnostic radiology for acceptance testing and constancy checks in radiogra phy fluoroscopy dental X ray mammography and com puted tomography CT applications Operation mode conti...

Страница 84: ...1 s 4 40 150 kV 1 kV or 1 5 23 35 kV 0 5 kV 1 5 40 mm Al 2 5 mm Al or 10 1 5 40 mm Al 0 5 mm Al or 10 0 95 13 5 mm Al 0 25 mm Al 0 25 0 75 mm Al 0 01 mm Al MAM radiation qualities Mo 30 m Mo Mo 0 5 mm...

Страница 85: ...t 1 kHz 12 8 s at 500 Hz 25 6 s at 250 Hz 64 0 s at 100 Hz 3200 s at 2 Hz 5 Reference point measurement depth 4 7 mm 0 5 mm below top of device Power supply 5 VDC Power consumption 180 mA Interface US...

Страница 86: ...class I device without measuring function MDD Intended use Mechanical holder for attachment of the NOMEX multimeter to a dental X ray unit attachment of the NOMEX multimeter to a tripod by means of a...

Страница 87: ...multimeter to be mounted in the cassette compartment of an X ray unit Components holder frame spring loaded locking bar Material Holder frame Locking bar POM natural POM black Density Holder frame Lo...

Страница 88: ...89 L178088 L522056 Accessories NOMEX multimeter holder Mechanical holder for the attachment and positioning of the NOMEX multime ter T20016 NOMEX multimeter cassette adapter Mechanical holder enabling...

Страница 89: ...thoroughly inspected by service personnel before being used again CAUTION Disinfection of the surface with disinfectants on a phenol base or peroxide compounds Equipment Damage Do not use disinfectant...

Страница 90: ...Before each use visually inspect the product and the cables for signs of mechanical dam age If damage or malfunctions are identified the product must be repaired before it is used again Repair Repairs...

Страница 91: ...or by specially trained staff on site 18 Repairing Legally Calibrated Dosemeters NOTE This section is applicable in countries where legal requirements exist demanding calibra tion for example Germany...

Страница 92: ...he product lifetime is to be borne by the customer At the end of the product lifetime the components of the product must be disposed of in compliance with the applicable waste control regulations The...

Страница 93: ...osimetric instruments used for non invasive measure ment of X ray tube voltage in diagnostic radiology 5 IEC 61010 1 Safety requirements for electrical equipment for mea surement control and laborator...

Страница 94: ...azardous substances or elements contained in electronic information products will not leak or mutate under normal operating conditions so that the use of such electronic information products will not...

Страница 95: ...mit requirement in SJ T11363 2006 X Indicates that this toxic or hazardous substance contained in at least one of the homogeneous materials used for this part is above the limit requirement in SJ T113...

Страница 96: ...information 2 I Icons explanation 34 34 35 35 37 Indicators 18 Installation of software 21 Interfaces 18 Intro 52 K kV range 47 L Language 52 List of figures 7 Literature 93 M Main screen 30 Maintenan...

Страница 97: ...audio 52 general 40 measurement 44 Spare parts 88 Start delay 46 Starting the software 24 Stop delay 47 Symbols 14 T Target directory 22 Technical inspection of the measuring system 91 Technical speci...

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