GQ Electronics Technical Support Forum


GQ Electronics Technical Support Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Username:
Password:
Save Password
Forgot your Password?

 All Forums
 GQ Electronics Forums
 3. GQ EMF EF Meter RF Spectrum Power Analyzer
 RF Minimum always the same value
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

Stephan

Germany
8 Posts

Posted - 04/10/2019 :  10:34:44  Show Profile  Reply with Quote
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
Reply #1

EmfDev

644 Posts

Posted - 04/10/2019 :  12:12:20  Show Profile  Reply with Quote
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.
Go to Top of Page
Reply #2

Stephan

Germany
8 Posts

Posted - 04/11/2019 :  04:50:46  Show Profile  Reply with Quote
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

Go to Top of Page
Reply #3

EmfDev

644 Posts

Posted - 04/11/2019 :  11:43:48  Show Profile  Reply with Quote
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?
Go to Top of Page
Reply #4

Stephan

Germany
8 Posts

Posted - 04/12/2019 :  00:29:58  Show Profile  Reply with Quote
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
Go to Top of Page
Reply #5

EmfDev

644 Posts

Posted - 04/12/2019 :  14:49:58  Show Profile  Reply with Quote
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.
Go to Top of Page
Reply #6

Stephan

Germany
8 Posts

Posted - 04/12/2019 :  22:58:43  Show Profile  Reply with Quote
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
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
GQ Electronics Technical Support Forum © Copyright since 2011 Go To Top Of Page
Generated in 0.08 sec. Snitz Forums 2000