Australië: Stralingsemissie slimme meter

Bron: www.arpansa.gov.au/pubs/technicalreports/tr163.pdf .
dec. 201`3

Australian Radiation Protection and Nuclear Safety Agency

ARPANSA Preliminary Measurements of Radiofrequency Transmissions from a Mesh Radio Smart Meter

Don Wijayasinghe and Ken Karipidis

Technical Report Series No. 163

Contents

1. Summary ........................................................................................... 1
2. Background ....................................................................................... 1
3. ARPANSA Measurements .............................................................. 2
4. ARPANSA Spectrum Analyser Results ........................................ 3
5. ARPANSA Timing Measurement Results .................................... 4
6. Comparison with public exposure limits ...................................... 5
7. Conclusion ......................................................................................... 5
Acknowledgements ............................................................................... 6
References ..............

6. Comparison with public exposure limits

The instantaneous exposure at 0.5 m expected from the 1-watt transmitter is less than 1/15,000 of the instantaneous exposure limit, and actually much lower still because only part of the body can be exposed to the highest value.

Based on the timing measurements, the maximum duty cycle over any 6 minute period (including the periods when the maximum length pulses were transmitted) was less than 0.7%. The average duty cycle was 0.07%. The maximum 6-minute average exposure expected at 0.5 m is 2.1 milliwatt/m2 (0.21 microwatt/cm2). This represents 0.046%
(1/2,180) of the public exposure limit.

Exposures (6-minute average) at more typical distances from the smart meter of, for example 5 metres, would be expected to be a factor of 100 lower, or less than 21 microwatt per square centimetre.

The measurements over a few hours may have missed the main communications periods but 24-hour measurements showed several periods when the longest pulses of 83 ms were transmitted. At 16:20, a group of 18 such pulses were transmitted within a few seconds. As mentioned, scattering and antenna directionality may increase these values by factors of 2 – 5, perhaps.

7. Conclusion

The measured and calculated exposures are all well below the public exposure limits. The radiofrequency used is similar to the frequency used by GSM mobile phones and the peak transmission power is somewhat less. Many other wireless technologies have pulsed structure to their transmissions and many transmit throughout the whole day. The
radiofrequency electromagnetic energy transmitted in a single pulse from the smart meter is similar to that measured from a car remote unlocking fob and much less than measured from a single GSM SMS transmission. The measurements do not provide any indication of why smart meter transmissions would provoke symptoms in people otherwise unaffected by other wireless technologies such as GSM mobile phone handsets.

Voor het volledige rapport zie bovenstaande link.



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