GQ Electronics Technical Support Forum Active Users: / Visits Today:
Highest Active Users:
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
 Does GQ EMF-390 show values that base on P(eff)?		  New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

frank.mathieu@GQ

Germany
35 Posts
Posted - 07/14/2025 :  02:03:11  Show Profile  Reply with Quote
Dear specialists
I am sorry, there were errors in my formulas. I take the formulas out but my question is the same.

GQ EMF-390 provides both, LF and HF measurements per second that I read out to perform analyses. Mathematically this is field strength in V/m and Power density in pW/cmČ for one second.

In electrotechnics it is advised to calculate average values with a root square mean and not use the arithmetic mean to get the effective value of electric power.

Are measurements of GQ EMF-390 based on U(eff) and I(eff) or not?

I need that information for the calculation of average values.
(a) To get the average value in a time frame of 6 minutes, can I use the arithmetic mean (Sum/count of measured Values) or

(b) do I have to calculate the root mean square...
Square root of ( sum of squared measurement values / count of measurements )

Thank you.
Have a good day.
Edited by - frank.mathieu@GQ on 07/14/2025 04:30:57
Reply #1

frank.mathieu@GQ

Germany
35 Posts
Posted - 07/17/2025 :  23:50:49  Show Profile  Reply with Quote
In other words,
a) are HF power density measurements per second based on the RMS (root mean square)?
b) is it correct to use the arithmetic mean (sum of values divided by count of values) for average values (like for 6 Minutes, an hour or a day)?

Thank you.
Go to Top of Page
Reply #2

EmfDev

2355 Posts
Posted - 07/21/2025 :  12:29:33  Show Profile  Reply with Quote
a. I think they are using peak readings.
b. in order to average them over a duration, yes you can do that.
Go to Top of Page
Reply #3

frank.mathieu@GQ

Germany
35 Posts
Posted - 07/24/2025 :  03:42:59  Show Profile  Reply with Quote
Thank you.
Go to Top of Page
Reply #4

frank.mathieu@GQ

Germany
35 Posts
Posted - 08/24/2025 :  07:28:49  Show Profile  Reply with Quote
I need to get back to your answer.
You said They use Peak readings.

Does EMF-390 show the peaks of power P across time (green field) or the peaks of the sine function in the image?

Thank you.
Go to Top of Page
Reply #5

frank.mathieu@GQ

Germany
35 Posts
Posted - 09/10/2025 :  14:44:27  Show Profile  Reply with Quote
Dear all, I gave it some more thoughts about my question and as the tool is measuring multiple electric fields with different frequencies simultaneously my previous picture in Reply #4 does not apply.
An oscilloscope would most likely show something that looks like a graph of rock music.

Trying to work with UČeff to determine an electric power for direct current will always fail because peak values are measured, saved and displayed (see Reply #2 above).
This is why using an arithmetic mean is fully acceptible.


Many thanks to EmfDev and the answer that I did not understand before.
Good work.
Edited by - frank.mathieu@GQ on 09/10/2025 14:46:16
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 0.07 sec. Snitz's Forums 2000