MAS-1B User`s Manual - English - 3.0B
Contents
1. Normally only a few minutes of charge is needed to be able to measure for an hour or two The battery cannot be over charged since the MAS 1B contains a charging controller MAS 1B User s Manual 2010 04 3 0B 3 MEASUREMENTS 3 MEASUREMENTS 3 1 Measurements of the mAs and mA Value Setup the MAS 1B according to the section Connection of the MAS 1B 5 Power on the MAS 1B and then the Piranha or Barracuda Start the QABrowser as described in the QABrowser manual and then select the appropriate Real time Meter display e g tap Measure Radiography Tube Current for the Barracuda you must also choose the EMM module to be able to read the current It is typically shown in the unit mA Tap Reset then 0 should be displayed The offset adjustment procedure for Piranha or Barracuda is finished and the MAS 1B is ready for measurements Now just perform an exposure and the QABrowser will show you readings of tube current mA and tube charge mAs You may also study the tube current waveform by tapping the Wave button The Piranha or Barracuda starts to measure when the mA signal is greater than approximately 0 1 mA when using the MAS 1B For long exposure times you may want to switch to the Continuous update mode The QABrowser will then update the display continuously during the exposure See Settings in the Piranha or Barracuda manual Note that when using a PC connected to mains and and at the same time a cable to t2. on again Do NOT connect the MAS 1B to the filament current circuitry The MAS 1B is only intended to measure the tube mA and mAs Do NOT use the MAS 1B in contact with a patient Do NOT use MAS 1B on a circuit with voltage higher then 90 V DC Do NOT expose the instrument to direct sunlight extremes of temperature and humidity or dew fall Do NOT exceed maximum tube current input Do NOT forget to turn the power switch off after use Do NOT use the MAS 1B on a circuit with a voltage of higher than 600 V AC Note The MAS 1B is intended for service and quality control of diagnostic X ray equipment It is not intended for use during or together with diagnostic examinations of patients RTI Electronics AB takes no responsibility for misuse of the MAS 1B or use together with products that the MAS 1B is not intended for RTI Electronics AB assumes no responsibility for customers not following these safety precautions 2010 04 3 0B MAS 1B User s Manual 4 SAFETY PRECAUTIONS General Rules 5 SPECIFICATIONS 5 1 General Specifications for MAS 1B Specifications are valid after a warm up time of one minute and presuming reference conditions Reference conditions Temperature 18 C to 23 C Relative humidity Specifications 0 001 at least 9999 mAs inaccuracy oF 40 01 mA and relative humidity at lt 80 relative humidity 10 C to 50 C Max common mode voltage ground MAS 1B User s Man
3. studies of the built in help function in measurement software or on request in a course provided by the manufacturer The product is intended to be used inside X ray rooms ready for clinical use and can safely be left switched on and in any measuring mode in the vicinity of patients The product is NOT intended to be used for direct control of diagnostic X ray equipment performance during irradiation of a patient so that patients or other unqualified persons can change settings of operating parameters during and immediately before and after measurements MAS 1B User s Manual 2010 04 3 0B Contents Table of Contents 1 J INTRODUCTION aude cct vx Eros Osca 4 1 1 A Presentation of the MAS 1B 2 44 1 4 2 FUNCTION AND ar nnn an 5 2 1 Connection of the MAS 1B 5 2 2 Battery and Charging ssssssssssssssssssseeeeeen eene nnne 6 3 MEASUREMENTS uev dioere Baer ce ete dad cunda 7 3 1 Measurements of the mAs and MA Value 7 3 2 Hints and Trouble shooting seen 7 4 SAFETY 8 4 1 General RULES ss ives n cerner reet ETE Ta nevi a E EN E Ee EYE ET es 8 5 65 2
4. 1 1 4 aa da du naa 10 5 1 General Specifications for 5 1 0 10 EET 11 Note For a full description of the Piranha or Barracuda see the Piranha or Barracuda Reference Manual That Manual can be found on the Product CD or be downloaded from RTI s website www rti se The manual is available both as PDF and Browser format The Browser HTML format is recommended for easy searching 2010 04 3 0B MAS 1B User s Manual HM 1 INTRODUCTION A Presentation of the MAS 1B 1 INTRODUCTION 1 1 A Presentation of the MAS 1B The MAS 1B probe provides an invasive way to measure mA and mAs on X ray equipment The current probe should be connected to the X ray mAs socket It is connected in series with the tube current ground return line of the high voltage transformer The tube current feeds a 2 2 ohm resistor and the voltage drop is measured and converted to a signal suitable for the Piranha or Barracuda MAS 1B should be used only on those generators providing open and short circuit protection of the measuring circuit and where the circuit operates not more than 90 V above or below ground potential The probe has a built in second order low pass filter with a bandwidth of 500 Hz The probe accept floating current input of 90 V relative to the ground level which makes it accept most manufacturers current signals The MAS 1B can measure from 0 1 mA to 3000 mA when used together with the
5. MAS 1B Invasive Tube Current Probe Adapter User s Manual English Version 3 0B RTI Electronics AB reserves all rights to make changes in the MAS 1B and the information in this document without prior notice RTI Electronics AB assumes no responsibility for any errors or consequential damages that may result from the use or misinterpretation of any information contained in this document Copyright 1993 2010 by RTI Electronics AB All rights reserved Content of this document may not be reproduced for any other purpose than supporting the use of the product without prior permission from RTI Electronics AB Contact Information World Wide RTI Electronics AB Fl jelbergsgatan 8 C SE 431 37 M LNDAL Sweden Phone Int 46 31 7463600 Fax Int 46 31 270573 E mail Sales sales rti se Support support rti se Service service rti se Web site http www rti se Contact Information United States RTI Electronics Inc 1275 Bloomfield Ave Building 5 Unit 29A Fairfield NJ 07004 USA Phone 800 222 7537 Toll free Int 1 973 335 4200 Fax Int 1 973 335 1225 E mail Sales sales rtielectronics com Support support rtielectronics com Service service rtielectronics com Web site http www RTI article number 9630509 00 Intended Use of the MAS 1B Together with instruments from RTI Electronics AB it is to be used for independent service and quality control as well as measure
6. Piranha or Barracuda By using Free run or Timed update modes the MAS 1B is able to measure even lower CAUTION Users of mAs meters must be aware of the potential damage to generators and electrical human hazards in the case of improper connection or failure of any part of the meter circuit The MAS 1 is intended for use only by those skilled in the calibration and repair of X ray machines Please read the section SAFETY PRECAUTIONS 8 for more safety rules MAS 1B User s Manual 2010 04 3 0B 2 FUNCTION AND CONNECTION 2 FUNCTION AND CONNECTION 2 1 Connection of the MAS 1B Please be aware that high voltage may exist if the mA probe connection is not properly made Read the SAFETY PRECAUTIONS chapter before you start measuring Power down the X ray unit and turn OFF the MAS 1B Connect the MAS 1B to the mAs measuring socket using the included safety cables Please observe the polarity see picture below High Voltage X ray Transformer Exchange the short circuit connector with MAS 1 at this socket to be able to measure mA and mAs X ray tube tube current ground return line A 4 mAs measuring Attach Socket cable to meter Caution Users of mAs meters must be aware of the potential damage to generators and electrical human hazards in the case of improper connection or failure of any part of the meter circuit The MAS 1 is intended for use only by those skilled in the calibration and repa
7. elected values 100 kV 80 ms and 10 25 and 50 mA The upper part of the right picture shows the radiation intensity response from the detector The lower part of the figure shows the tube current measured with MAS 1B Note especially the last part of the exposure Large mAs errors can be made if this part cannot be avoided The left picture shows that the high voltage cables act as capacitors and can influence the mAs measuring result e Note that when using a PC connected to mains and and at the same time a cable to the Piranha or Barracuda ground loops may arise that generates ground currents that affects the measurements It is recommended to connect wirelessly between the PC and meter or run a laptop PC on battery 4 SAFETY PRECAUTIONS 4 1 General Rules Only use the MAS 1B if you are authorised to make invasive measurements using the X ray generator mAs measuring socket Please be aware that high voltage may exist on the MAS 1B if the cable connection between MAS 1B and the X ray generator mAs socket is broken Always switch off the X ray generator and wait approximately one minute before you make any connection or disconnection of the cables between MAS 1B and MAS 1B User s Manual 2010 04 3 0B 4 SAFETY PRECAUTIONS General Rules the mAs measuring socket Always check that the short circuit path normally connected to the mAs measuring socket is connected after the use of the MAS 1B and before the X ray unit is switched
8. he Piranha or Barracuda ground loops may arise that generates ground currents that affects the measurements It is recommended to either connect wirelessly between the PC and meter or run a laptop PC on battery 3 2 Hints and Trouble shooting e f current be measured please check the direction of current Piranha or Barracuda CANNOT measure negative current The most common cause of failure to measure correctly is incorrect connection to the X ray generator usually to the tube filament circuit Please use All and put the Piranha or Barracuda in the X ray field to gate the measurements if it is a problem to hold the mAs value when using the single tube current mode This may happen because of current noise from the rotating anode engine e An8 meter extension cable EXT 1 is available if needed to further extend the cable good rule is that the mA waveform should be studied whenever checking the mA station Large inaccuracy can arise when small values are measured if the mA waveform information is not available If the value is lower than 10 mAs special attention must be drawn to how the 2010 04 3 0B MAS 1B User s Manual 3 MEASUREMENTS Hints and Trouble shooting charge supplied to the capacitance in the high voltage cable will influence the measuring result See picture below The easiest way to do this is to use the oRTIgo Ocean waveform analyser Wat A 2 AAA AA S
9. ir of X ray machines Please read SAFETY PRECAUTIONS 8 for more safety rules Now connect the MAS 1B to the detector input of the Piranha or Barracuda using the included cable Attach the round Lemo female connector to the connector that is marked Output on the probe and the other end to the electrometer input on your meter 2010 04 3 0B MAS 1B User s Manual 2 FUNCTION AND CONNECTION Connection of the MAS 1B Output Lo Hi 9 9 e To X ray generator mAs socket 9 High voltage Wan ning b present during use Turn ON the MAS 1B using the grey rocker switch on the back panel by pushing the top part of the switch The green LED will now indicate that the MAS 1B is powered ON If the red LoBat LED lights up it indicates that the battery voltage is low Please recharge the MAS 1B before measuring See Battery and charging 6 2 2 Battery and Charging The MAS 1B uses a built in rechargeable battery which you charge using the standard mini USB connector at the back of the probe You can use either e a USB cable and charge it from your computer the charger that came with your Piranha ora standard USB charger with an output of 5 V Finally you need to flip the power switch to Off Charge Note that you cannot use the MAS 1B while it is charging If the yellow LED at the back is lit it indicates that the battery is charging When the yellow LED switches off the MAS 1B battery is fully charged
10. ments of kerma kerma rate kVp tube current exposure time luminance and illuminance within limitations stated below If installed according to accompanying documents the product is intended to be used together with all diagnostic X ray equipment except for therapeutical X ray sources X ray equipment with tube potential below 20 kV X ray equipment on which the instrument cannot be mounted properly e g equipment where the beam field size is narrower than the active part of the detector specific types of X ray equipment listed in the instructions for use or in additional information from the manufacturer With the X ray installation in stand by conditions without patients present the product is intended to be used to provide the operator with information on radiation beam parameters that might influence further steps in an examination but not an ongoing exposure for assessing the performance of the X ray equipment for evaluation of examination techniques and procedures for service and maintenance measurements for quality control measurements for educational purposes authority supervision etc The product is intended to be used by hospital physicists X ray engineers manufacturer s service teams and other professionals with similar tasks and competencies The operator needs a short training to be able to use the product as intended This training can be achieved either by careful study of the manual
11. ual 2010 04 3 0B Index 44 Index R Range 10 Note Rechargeable 6 Page references in this Index points to the Red LED 5 first page of the section it is mentioned not S the exact page Safety 8 Specifications 10 Storage temperature 10 Accuracy 10 2 T Trouble shooting 7 Bandwidth 10 U Battery 6 10 Battery life 10 USB charger 6 Battery type 10 Weight 10 Calibration factor 10 Workflow 7 Capacitance the HV cable 7 Y E Charging 6 Connection of the MAS 1B 5 Yellow LED 5 6 D Dimensions 10 E Extension cable 7 zF Frequency range 10 General Rules 8 GreenLED 5 Groundloops 7 H Hints and Trouble shooting 7 HV cable capacitance 7 Inaccuracy 10 Introduction 4 Measurements 7 Measuring Range 10 Negative current 7 Noise 7 Operating temperature 10 Output 5 Piranha power supply 6 Polarity 5 PowerON 5 2010 04 3 0B MAS 1B User s Manual Notice Notes MAS 1B User s Manual 2010 04 3 0B
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