B
Blarp
- Jan 1, 1970
- 0
In our company we make stuff that must meet EMC requirements. Usually
the radiated emissions are the most challenging. We have these checked
in accredited test houses, which are expensive.
So we try to pre-check the products to see if there is fair chance of
success.
We have no OATS or anechoic room, so we make do with a logper antenna
in an empty office room. The ambient radio smog is making this
virtually impossible nowadays.
I recently bought a secondhand 3m TemCell, intending to use it the
wrong way around (not immunity, but unwanted radiation).
After reading up on the matter I became convinced that it should be
possible to get at least a fair -albeit uncalibrated- impression of
the radiated spurious of the EUT.
Not so however. If a EUT with known radiation characteristics is
placed in the TemCell, all I see is a Flat line on the spectrum
analyzer. I might as well have connected a dummy load. Even with a
preamp I see nothing.
Connecting the same spec on the same setting on the antenna, the
screen lights up. And the EUT does radiate..
Question:
Anybody else out there doing what I do? Am I expecting something that
is not there? Does a TemCell not work both ways (reciprocal)?
Or is the cell just broken...and do I need to tear it open for
repairs?
Thanks in advance!
Best Regards, Rene
the radiated emissions are the most challenging. We have these checked
in accredited test houses, which are expensive.
So we try to pre-check the products to see if there is fair chance of
success.
We have no OATS or anechoic room, so we make do with a logper antenna
in an empty office room. The ambient radio smog is making this
virtually impossible nowadays.
I recently bought a secondhand 3m TemCell, intending to use it the
wrong way around (not immunity, but unwanted radiation).
After reading up on the matter I became convinced that it should be
possible to get at least a fair -albeit uncalibrated- impression of
the radiated spurious of the EUT.
Not so however. If a EUT with known radiation characteristics is
placed in the TemCell, all I see is a Flat line on the spectrum
analyzer. I might as well have connected a dummy load. Even with a
preamp I see nothing.
Connecting the same spec on the same setting on the antenna, the
screen lights up. And the EUT does radiate..
Question:
Anybody else out there doing what I do? Am I expecting something that
is not there? Does a TemCell not work both ways (reciprocal)?
Or is the cell just broken...and do I need to tear it open for
repairs?
Thanks in advance!
Best Regards, Rene