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Stephan
Germany
8 Posts |
 Posted - 04/10/2019 : 10:34:44
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Hello,
I have the EMF-390. The lowest RF value, no matter where I am, is always 89.8 pw/cm2, even if I wrap the device in aluminium foil. I don't think that's normal. Does the device need to be calibrated or is there something else to adjust?
Many thanks in advance.
Stephan |
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| Reply #1
EmfDev
2143 Posts |
Posted - 04/10/2019 : 12:12:20
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| Hi Stephan, 89.8 pw/cm2 is a really small number. It's equal to 0.0000898 microWatts per cm2 = 0.0000000898 mW/cm2, which is almost 0. So just treat it as 0. |
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| Reply #2
Stephan
Germany
8 Posts |
Posted - 04/11/2019 : 04:50:46
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Hi,
According to technical data, the resolution is 0.01 microWatt/m2.
89.8 pw/cm2 is equal to 0.898 microWatt/m2, if I calculated correctly. This value is clearly above the resolution of 0.01 microWatt/m2 and cannot be assumed to be zero. For bedrooms, for example, < 0.1 microWatt/m2 is recommended by an institute for building biology. With the EMF-390 it is not possible to measure in this range if I have to assume 89.8 pw/cm2 as zero and this despite the given resolution of 0.01 microWatt/m2. Do I see that correctly?
Many thanks
Stephan
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| Reply #3
EmfDev
2143 Posts |
Posted - 04/11/2019 : 11:43:48
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Hi Stephan, I need to check with the design for this. You are correct with the conversion.
But do you have reference for the < .1 uW/m2? |
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| Reply #4
Stephan
Germany
8 Posts |
Posted - 04/12/2019 : 00:29:58
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Hi,
You can find the info regarding the reference for bedrooms here:
https://www.baubiologie.de/downloads/building-biology-guidelines-english.pdf
Is my conversion really correct, or is it the other way around? Is the power density with the same radiation at 1m2 not lower than at 1cm2?
100pw/cm2 = 0.01pw/m2 = 0.00000001 microWatt/m2
Please check it out.
Thank you!
Stephan
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| Reply #5
EmfDev
2143 Posts |
Posted - 04/12/2019 : 14:49:58
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You were correct, 100pw/cm2 * 100cm/m * 100cm/m = 1000000pw/m2 = 1uW/m2.
But the EMF meter should reach <10 pW/cm2 or <.1 uW/m2. It was tested. If not maybe the noise is coming from itself. |
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| Reply #6
Stephan
Germany
8 Posts |
Posted - 04/12/2019 : 22:58:43
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Yeah, great!
Sorry for the confusion I may have created. I am very satisfied with the EMF-390 and will recommend it to others.
Thank you!
Stephan
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RF Minimum always the same value
