E field total value...

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# E field total value to find the exposure limit

(@albertom)
Active Member
Joined: 11 years ago
Posts: 15
Topic starter

I need to find the total value of E field (V/m) to make in relation with the exposure limit.
I live in Italy. ( 6 V/m is the limit for the law - cell towers phone ). We are speaking about HF spectran and hight frequency ( 800 Mhz - 2400 Mhz )
I collected many informations from my engineers collegues about the system used by specific instruments that are sensible only to E field and are recognized for this measurements.
I built a simple file excel to calculate the total E field.
I used the value recorded from Spectran in dBm , frequency by frequency (columns) , time by time (lines).
I made three different measurements , in Y , X , Z axis .
I calculate the average into the time of dBm , frequency by frequency ( separatly for X , Y , Z ).
With this medium value of dBm , I calculate the S value ( power density ), frequency by frequency , using the correct dBi ( antenna gain) of Omnilog.
I calculated the E field , frequency by frequency.
My collegues tell me that the system, used from the specific instruments that are sensible only to E field and are recognized for this measurements , is calculate the the square root of the sum of the quadratic value of E. This method is applied for the values frequency by frequency and the values in X ,Y ,Z .
I elevate the E value in quadratic , i make the sum for all frequency steps , I make the square root. This method separately for X recording , Y recording , Z recording.
I made the same calculation with the three results for X recording , Y recording , Z recording. In this way I find the total E field in a specific frequency range during a specific time of recording ( 6 minutes for the law )

I don't know if I'm able to explain the concept , but mathematically is very simple.

1° - Do you confirm that this way to calculation is correct ?
2° - Do you think is difficult to insert automatically into the software the calculation of E total field with this logic ?

(@albertom)
Active Member
Joined: 11 years ago
Posts: 15
Topic starter

I try to make the same question in other way.
if is difficult make square root of the sum of the quadratic value for E field we can work with S .
I know that for the S power density is necessary to sum the scalar value ( without square root of the sum of the quadratic value ).

My simple question :
Is possible, by software, obtain automatically the sum of the S power density ( calculate with the specific gain antenna in specific frequency ) in all range of frequency scanned in average for the period of recording ? ( To calculate E field is possible manually from S )

(@mm_dev)
Joined: 11 years ago
Posts: 321

If I understand you correctly (not sure about that) this feature is already implemented in the limits view of the MCS, you just have to define a custom limit using the Limit Editor in the Extras menu.

(@albertom)
Active Member
Joined: 11 years ago
Posts: 15
Topic starter

Thanks for reply , but is not what I want to know.
Next week , monday , I'll write in other way .

(@moderator)