Electrical code Compliance

Author

EN 61326

chengat@gmail.com

2005-10-21, 5:21 pm

I have a question regarding radiated immunity tests.

The standard states that the test must sweep from 80MHz to 2.5GHz.

The standard also states that the dwell time needs to be at a least the
sample time of the instrument. Our instrument has a sample time of 1
min.

Our instrument is a metal box, with slots on four sides.

The largest dimension on the slots would be 9.5".

310MHz has a 1/4 wavelength equal to or less than 9.5"

Is there any reason why I need to test any frequencies below 310MHz?
It's my understanding that any frequencies below 310 MHz would not be
able to get into a 9.5" slot.

Paul Hovnanian P.E.

2005-10-21, 7:21 pm

chengat@gmail.com wrote:
>
> I have a question regarding radiated immunity tests.
>
> The standard states that the test must sweep from 80MHz to 2.5GHz.
>
> The standard also states that the dwell time needs to be at a least the
> sample time of the instrument. Our instrument has a sample time of 1
> min.
>
> Our instrument is a metal box, with slots on four sides.
>
> The largest dimension on the slots would be 9.5".
>
> 310MHz has a 1/4 wavelength equal to or less than 9.5"
>
> Is there any reason why I need to test any frequencies below 310MHz?
> It's my understanding that any frequencies below 310 MHz would not be
> able to get into a 9.5" slot.

Does it have a power cord or any other connections to the outside world
that might act as antennas?

--
Paul Hovnanian mailto:Paul@Hovnanian.com
------------------------------------------------------------------
If everything is coming your way then you're in the wrong lane.

chengat@gmail.com

2005-10-21, 9:21 pm

Yes

1 side has an AC power cord

1 side has a cable connection to a keyboard, a parallel port cable to a
printer,

1 side has tubings which carry fluid that is conductive

1 side has no connections.

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