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Topic: Not clear (the magnetic?) a field in a room

I work on normal operation, at office...
Something like Quality Department of electronic production, in my room 3 computers (office equipments are not present)
There is an oscillograph.
It is known that if to concern with a finger of a wand of an oscillograph, at sufficient sensitivity of the order of hundreds millivolt he writes frequency 50  - electromagnetic  from the electric system on a finger.
Casually concerned today and looked narrowly - the oscillograph ray seemed "dirty", that is a line with a pulsation 50  - very thick.
Such happens, if against low frequency there is higher with smaller pressure.
Twisted the frequency pen... ... Approximately in a big way 30 millivolt is present frequency nearby 30 . (At a choice in 1 division of 20 microseconds in a cell is located somewhere one and a half peak).
And what it for frequency?
Near to me (in meter) three computers... But for the computer it is frequency like very low,  and storage work on ggts/hundreds megahertz... The videocard too.
What for a hogwash?
Whence in a room can be  on a surface of a human body with frequency about 30 kilohertz?:confused:

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Re: Not clear (the magnetic?) a field in a room

Grigory-G
Impulse power supplies, can quite work on such frequencies. Inverters of illumination of monitors.
Much all can be.

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Re: Not clear (the magnetic?) a field in a room

Grigory-G
Whence in a room can be  on a surface of a human body with frequency about 30 kilohertz?
Lamps, impulse power units...

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Re: Not clear (the magnetic?) a field in a room

Wrist watch quartz?

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Re: Not clear (the magnetic?) a field in a room

In budgetary Chinese impulse computer  there are no supply filters. More precisely, holes under them in software are, and filters are not present. 30 kilohertz it just therefrom. When used desktops, itself there filters installed. Approach from CRT TV sets. At BP  and other small nonsense of frequency normally differ from 30 .

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Re: Not clear (the magnetic?) a field in a room

Kolobokk
Well actually yes, frequencies of lamps should be more low.
And here  - most likely it so.
Today  at all computers also I will look at an oscillograph...:p
Milk for harm on such operation should produce:lol:
Figs it knows, how this field on the person operates...

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Re: Not clear (the magnetic?) a field in a room

Grigory-G
Well actually yes, frequencies of lamps should be more low.
Since then as the progressive mankind guessed electronic ballasts and power units of frequency of lamps to anybody should of nothing.

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Re: Not clear (the magnetic?) a field in a room

Grigory-G
Milk for harm on such operation should produce
Figs it knows, how this field on the person operates...

do.

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Re: Not clear (the magnetic?) a field in a room

Really, ungeared the whole world... Then included on a ceiling...
These 30  give local lighting of a workplace....

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Re: Not clear (the magnetic?) a field in a room

Grigory-G
Strange. At  frequency floats, as with self-excitation. At the LED can be differently.
[off] I when collected a frequency meter (at Councils), found out any strange noise which appeared  20 seconds. Then guessed - range finder  clings my skyscraper (I just on the top). So your fears are insignificant. [/off]

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Re: Not clear (the magnetic?) a field in a room

Local lighting - type of desk lamps with a clothespin, there such  tubes luminescent.
Well probably does not float...