07-29-18, 06:34 PM
We have a RAYMARINE DRS4D Nav radar fitted to our small boats and note the user manual quoted safe distance of 1m (10W/m2). The 10 W/m2 annotation indicates that this is an Average Limited radar. However when we do our calculations we find that this radar is peak limited.
(ie worst case Duty Cycle of 7.4x10-4 and a Ks (Rotational Reduction Factor) of 1.36x10-2 = 1.007x10-5. For a peak limited radar this will be less that the ICNIRP S(av)/S(pk) ie 10/10000 = 0.001) NB: If it was 'greater than', then it would be an Average Limited emitter.
(Dc*Ks< Sav/Spk = Peak limited and 10000 W/m2 instantaneous exposure applies)
(Dc*Ks> Sav/Spk = Average Limited an 10W/m2 averaged over 6 minutes applies)
Are you able to advise why our calculations are showing a peak limit, when the user manual states an Average limited system?
Thanks for your help
Tony
(ie worst case Duty Cycle of 7.4x10-4 and a Ks (Rotational Reduction Factor) of 1.36x10-2 = 1.007x10-5. For a peak limited radar this will be less that the ICNIRP S(av)/S(pk) ie 10/10000 = 0.001) NB: If it was 'greater than', then it would be an Average Limited emitter.
(Dc*Ks< Sav/Spk = Peak limited and 10000 W/m2 instantaneous exposure applies)
(Dc*Ks> Sav/Spk = Average Limited an 10W/m2 averaged over 6 minutes applies)
Are you able to advise why our calculations are showing a peak limit, when the user manual states an Average limited system?
Thanks for your help
Tony