Acoustimeter User Manual - Test and Measurement Instruments CC
Contents
1. Approvals and Contact 13 14 16 18 Specifications Typical overall frequency response using the internal antenna 200 MHz 8000 MHz 3dB 150 200 MHz and 8 10 GHz 6dB MeasurementRange 0 02 6 00 volts per metre V m 1 100 000 microwatts per square metre W m The detector can respond to levels below 0 02 V m audio from demodulation may be heard at levels below 0 02 V m Peak hold since turned on peak and average values displayed on LCD LED Scale Points peak LEDs updated approximately every 0 1 seconds Peak 0 02 0 03 0 05 0 07 0 1 0 2 0 3 0 5 0 7 1 1 5 2 3 4 5 6 V m Average calculated as the average of 1024 samples measured every c 0 35 seconds 1 5 10 25 50 100 250 500 1 000 2 500 5 000 10 000 25 000 50 000 100 000 W m Power Draw c 110 mA at 3 volts 2x AA Alkaline or Rechargeable cells 1 2 1 5V Battery Life Up to 20 hours Low battery detection is indicated Typically 15 hours on two new 1500 mAhr AA alkaline cells and typically 25 hours on two charged 2700 mAhr NIMH rechargeable cells Size 190mm x 102mm x 33mm LxWxD Weight 280g excluding batteries 4 Introduction The Acoustimeter has been designed to enable you to make a quick and informed judgement regarding the level and nature of microwave signals in your environment The Acoustimeter is a broadband instrument that accurately measures the totality of the radiation in th2. Acoustimeter 3 29 2 45 Vem Avgr 14 phn AUDIO OUT v AVERAGE W m 100000 50000 25000 10000 5000 2500 1000 500 250 VOLUME AA RF Meter Model AM 10 Frequency Response 200MHz 8 GHz Acoustimeter User Manual Safety Instructions Please read through these instructions carefully before operating the instrument It contains important information regarding usage safety and maintenance The instrument is not waterproof and should not come into direct contact with water nor should it be used outdoors in the rain If it is raining and you want to take measurements outside please cover the instrument in a plastic bag that does not have holes in it Clean the case using a damp cloth if necessary and do not use detergents This instrument is not intended to be serviced by the user neither does it need any special maintenance Unscrewing the case will void the guarantee This instrument is sensitive to heat and impact Exposing the instrument to high temperatures or dropping the meter on to a hard surface may cause it to stop functioning properly It may not display properly while it is in temperatures below freezing 0 C Acoustimeter Manual Contents Safety Instructions Technical Specifications Introduction ooccocc Layout of meter nsss Operation and use LED displays Troubleshooting Exposure Guidance Guarantee 0 0
3. Parliament bill GD Wissenschaft 900 1800 STOA GSM 2001 2100 900 1800 2100 Typical US EPA 1980 mainly FM amp TV Salzburg 2002 outside houses aim 900 1800 2100 Biolnitiative 2012 guidance 30 300000 Salzburg 2002 inside houses 900 1800 2100 Mobile phones will work at levels 900 2100 Broadband natural background 300 3000 16 Frequency E cae Power Power MHz W m2 uW m2 2 000 000 4 500 000 9 000 000 10 000 000 300 300000 z 01 100 000 30 30000 100 000 30 2000 not spec not spec 900 1800 2100 0 024 24 000 900 1800 2100 HE 10 000 30 300000 lt 10 000 900 1800 2100 os 0 001 1000 Sum of GSM o 0 001 1000 30 300000 06 0 001 1000 ie e2 oon aw 2100 0 2 0 0001 100 anao oo owo a0 900 1800 2100 0000001 900 2100 0 00001 lt 0 000 03 300 3000 lt 0 00003 lt 0 0000001 17 Disclaimer While EMFields considers that the information and opinions given here are sound you must rely upon your own skill and judgement when interpreting or making use of the information contained in this manual Guarantee The Acoustimeter comes with a 2 year return to base Guarantee Please contact us see page 19 for details and to arrange a return if required The meter is guaranteed to be free of manufacturing defects but not against wear from normal use nor damage caused by water or by physical impacts such as from dropping it Note It ha
4. akes three loud beeps Check for a Low battery screen message next time it beeps Replace the batteries The instrument readings are varying Make sure your fingers are clear of the antenna Modern signals pulse and peak signals are not consistent The instrument is sensitive and picks up these variations Regular high blips every few seconds may be due to a rotating radar transmitter or a WiFi signal The peak signal is high but the average signal is low This is normal and to be expected from modern digital microwave frequency signals The levels are very low no LEDs lit but I can just hear a slow regular ticking a bit like a very faint heartbeat This is the instrument picking up the noise of its own internal meter circuitry and not microwave signals This will only happen if the external field levels are well below 0 02 V m and no LEDs are lit 14 The instrument is giving readings that surprise me Are they correct Our extensive tests have shown that the Acoustimeter readings usually give a good indication of the microwave levels present The Specifications are given on page 4 Receiving and measuring pulsing RF signals over a wide frequency range is extremely difficult to do Even professional instruments costing many thousands of pounds have quite large error margins How you should add all the various frequencies and waveforms is a large debate on its own Different meters may well give differ
5. e range 200 MHz to over 8000 MHz 8 GHz which covers the frequencies used by most modern communication systems encountered in our everyday environment The Acoustimeter was designed using the experience gained from many years of practical RF and microwave measurements using a wide variety of professional instruments Readings are shown on both an LCD display and two series of graduated LED lights The LEDs update rapidly and allow you to quickly gauge the levels in an area and find any hot spots The Acoustimeter also has a loudspeaker and audio output socket for headphones or an audio recorder allowing you to determine with a small amount of practice what type of device is creating the signals Layout of the meter Peak hold Peak signal strength in volts per metre er 1 98 Wee Ass a phem Average power density in microwatts per square metre Acoustimeter AVERAGE RF Meter Model AM 10 Frequency Response 200MHz 8 GHz Key Display Peak signal LEDs Average power LEDs Audio jack mono 2 5mm Volume control On Off switch Internal Antenna Loudspeaker Battery compartment CANDTURWNE 6 Operation and use Ensure that you have correctly inserted correct batteries 2x AA cells Move the power switch into the On position The LEDs should at once display a moving pattern across all LEDs and the LCD should briefly display Acoustimeter EMFields 2009 changin
6. ent readings depending on what is being measured Many budget meters incorrectly display a peak power derived from peak signal strength as if it were a CW signal that will almost always be far too high It still makes a noise when inside a headnet or behind my screening The audio produced by the Acoustimeter is logarithmic in volume so even quiet signals can seem quite loud Check the figures that the Acoustimeter is displaying A 99 9 reduction of 100000 uW m2 to 10 pW m2 2 V m signal reduced to 0 05 V m will still be showing and sounding on the meter Close to transmitting sources it is likely that you will still hear something The screening material may have degraded over time or you may have a gap in your screening Even small gaps including above and below you will let in microwave signals 15 7 Frequency General Public Levels ICNIRP 1998 a recognised by WHO EU amp UK 1800 2100 Russia 2003 general public PRChina 300 300000 Italy Decree 381 1999 30 30000 Swiss Ordinance ORNI rms values for base stations 1st Feb 2000 1500 EU amp UK EMC suscept regulations 30 2000 Belgium Wallonia 900 1800 2100 Typical max in public areas near base station masts can be higher 200 1800 2100 USA City Dweller max FCC 1999 30 300000 Italy 2003 each base station aim Lichtenstein law from 2013 Salzburg 1998 amp 2000 Sum of GSM Biolnitiative 2007 30 300000 EU
7. er allows you to hear this and it is one way of identifying the source of the signals An analogue signal is a system of communication that is not digital They use a continuous carrier and instead of turning on and off to represent data will vary the frequency FM or strength AM Differences between peak average With an analogue system the peak and average levels should be similar as the signal is continuously on while it is being used However because most digital systems spend a large proportion of their time not transmitting the average level does not represent the actual waveform even though it is technically accurate as shown in the diagrams below Typical Digital Signal Digital Pulses Peak 10004W m2 Average 1004W m2 Typical Analogue Signal Continuous waveform Peak 3004W m2 Average gt 2504W m2 10 Why does this matter Since wireless communications were first developed on a large scale the scientific community held the opinion that if it does not heat you it will not hurt you as 30 years ago these were the only effects that were acknowledged The average heating effect was what mattered The measurement typically used now for measuring the time averaged power of microwave frequency EMFs is microwatts of power arriving per square metre uW m2 and we have used this for the Acoustimeter s average power measurement There have now been hundreds of studi
8. es finding non thermal effects from modern wireless communication signals This requires a change in what is measured to suit much lower signal levels with very different characteristics We believe that peak signal strength is the most appropriate way to measure complex digitally modulated often non continuous signals in a meaningful manner Signal strength is measured in volts per metre V m Many electrosensitive individuals report adverse health effects in areas that have quite high peak levels but have average field strengths below even the most precautionary guidelines regarding average power levels 11 There is an approximate equivalence between the two columns of LEDs for continuous waveform CW signals The Acoustimeter calculates the average power in the measured RF by a detailed analysis of the waveform The result is on the average power LEDs and on the LCD display The LED points on each of the scales approximately match for continuous wave CW signals The more pulsatile the signal is the higher the peak scale will read in comparison to the average power scale The EMFields website has a RF units What do the LED colours mean Our peak signal strength scale is coloured based on experience of what electrosensitive people have reported as adversely affecting their health Below 0 05 volts per metre V m few people report ill effects so these are green Between 0 05 and 0 5 V m some individuals report i
9. g to readings after a short time Hold the bottom of the instrument in one hand at least 30cm from your body as close proximity to your body will affect the readings Keep your hands away from the top of the instrument as this contains the antenna which is located inside the case at the rear towards the top The Acoustimeter can be placed upon a stable surface but movements nearby can still affect the RF microwave levels Adjust the volume to an appropriate level usually somewhere about mid volume is best only use maximum when monitoring weak signals The instrument will display the peak signal strength and the average power on both the LEDs and the LCD Slowly turn the instrument around in all directions Stop moving the instrument and hold it still to take a reading Bear in mind that even moving the meter small distances can result in 7 detecting very different levels of microwave energy Microwaves are reflected off the ground and other surfaces so it is important to check all angles The highest readings will often be found when holding the instrument facing you at an angle between horizontal and vertical We recommend taking the highest reading found in any one spot as this is when the antenna is most closely aligned with the directionality of the signal The Peak hold function will display the highest peak reading measured until the instrument is turned off and on again If there is hardly any noise wi
10. ll effects so these are yellow Above 0 5 V m nearly all sensitive individuals report experiencing adverse health effects so these are red The average power density scale LEDs are all orange in colour 1 W m 1 000 000 W m 100 W cm2 0 1 mW cm 2 12 PEAK V m 6 00 O can be this high close to DECT base 4 50 units WiFi access points and living 3 00 O close to a mobile phone base station 2 00 1 50 1 00 0 70 0 50 most people with ES do experience 0 30 y adverse health effects above this level 0 20 gt 0 10 gt 0 07 gt most people with ES do not experience 0 05 e significant adverse effects below this 0 03 Y 0 02 Y AVERAGE pW m 100000 Y 50000 Y typical maximum in public areas near 25000 base station antennas can be higher 10000 Y 5000 Y 2500 Y 1000 Q maximum in public areas guidance 500 o Biolnitiative 2007 8 Salzburg 1998 250 100 Y s09 250 10 Salzburg 2002 max outside homes 5 Biolnitiative 2012 max background 1 Q Salzburg 2002 max inside homes 13 Troubleshooting The meter is not working Check switch is in the on position Check that the batteries are correctly fitted The batteries may be flat Try changing them Note Ifthe LCD is displaying a reading then the meter is turned on and working LCD is blank or shows black squares Make sure that you leave 1 second between turning it off and turning it on again The meter m
11. s a degree of overload protection built in but it should not be used next to high powered RF transmitters that are likely to grossly overload it Approach these with caution and watch the displays to avoid gross overload 18 European Approvals CE ROHS and WEEE The Acoustimeter meets EN61000 6 3 2001 A11 2004 EN61000 6 1 2001 Electromagnetic compatibility EMC standards and also meets ROHS 2 2011 2002 95 EC and WEEE 2012 19 EU 2002 96 EC CE Y he Waste Electrical and Electronic pet WEEE Directive requires that unwanted electronic equipment must be disposed of using specialist recycling Your Acoustimeter can be returned to us for recycling UK local waste recycling centres also provide free collection points for WEEE Contact Test and Measurement Instruments C C Tel 27 0 11 683 4365 Email t m i iafrica com http www instrumentsgroup co za v5 0 2013 10 24 19
12. th the volume turned up then the instrument is not detecting any amplitude modulated i e pulsing signals Various sounds represent the amplitude modulation and digital pulsing of RF signals detected by the instrument It is sometimes possible to hear voices and music when very close to powerful medium and short wave AM transmitters which are outside of the normal RF frequency detection range of the meter When no LEDs are illuminated any regular very quiet ticking sounds should be ignored they are due to the internal functioning of the meter 8 Why are there two different readings The Acoustimeter is unique in the way it displays information about its measurements There are two different displayed results showing both Peak and Average measurements At first this may seem confusing We believe that it is important to know both when assessing your exposure to modern telecommunication signals We believe that it is the peaks in pulsing signals that are the most bio active at typical modern relatively low exposure levels Digital and Analogue Most modern wireless devices use a digital system of communicating This includes mobile phones WiFi Cordless phones DECT Digital TV DAB Radio Many modern digital systems turn the signal on and off at high speeds to represent data often with extra gaps between data bursts This produces a non continuous signal which we describe as pulsing The Acoustimet
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