Monitoring the field during test is appropriate, as a sanity check if
nothing else.
However, the actual field calibration and 're-play' requires measuring the
forward power, not the signal generator level. Sections 6.2 and 8 of the
standard specify forward power. Remember that the forward power is going to
vary depending on the match of the load (antenna), so a fixed signal
generator output is not necessarily an indication of the forward power. Even
with the same antenna, the impedance changes with change in geometry caused
by placing an EUT in the field, especially in the near field.
Bob Martin, P.E., N.C.E.
Intertek Testing Services, NA
978-263-2662
fax 978-263-7086
www.etlsemko.com
> ----------
> From:
> jim_bac...@mail.monarch.com[SMTP:jim_bac...@mail.monarch.com]
> Reply To: jim_bac...@mail.monarch.com
> Sent: Monday, January 29, 2001 4:28 PM
> To: samuil.lisin...@sanmina.com; 'emc-p...@majordomo.ieee.org'
> Subject: question about EN61000-4-3
>
>
> forwarding for samuil.lisin...@sanmina.com
>
> ____________________Reply Separator____________________
> Subject:
> Author: samuil.lisin...@sanmina.com
> Date: 1/29/01 11:57 AM
>
> Hello group,
>
> I have a question about EN61000-4-3. Specifically about field uniformity
> calibration procedure. Is it requirement to document level of forward
> power
> using directional coupler connected to antenna or is it enough to record
> drive level of signal generator.
>
> Any comments would be welcomed.
>
> Thanks,
>
>
> S. Lisinker
> EMC department
> SANMINA.
>
> -------------------------------------------
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