...@majordomo.ieee.org
Datum: donderdag 26 maart 1998 23:42
Onderwerp: EMI Site Interference
Hello Group -
Here's a problem for you all to think about and hopefully help solve.
I have a room in the corner of my building where I perform EMI pre-scans.
Occasionally throughout the day I have a major
is identical from all directions then it must be the cables
connecting to your receiver.
Regards
Vi
--
From: Scott Douglas [SMTP:s_doug...@ecrm.com]
Sent: 26 March 1998 18:15
To: emc-p...@majordomo.ieee.org
Subject: EMI Site Interference
Hello
Scot,
We had a problem at our lab that sounds very similar to yours. It turned
out to be dirty power line insulators. We were in the midst of a drought
at the time and the rains were not doing a good job cleaning the
insulators. The dirt built up to the point that there was conduction
through
Hi Scott,
You wrote:
This is broadband, from 30 MHz to
1 GHz, at levels up to 70 or 80 dBuv. It is not like a flat carrier but
rather more like PWM driven motor noise. It lasts from 15 seconds to 1
minute in duration. Then ambient returns to normal.
I've had a very similar problem, 20-30dB
Scott
I have a couple thoughts for you quick as they maybe given
that I am trying to go home! :-)
1) Is the interference line-locked? Try triggering off the
line freq once...
2) Is the building`s electrical supply underground? What
are the ground water conditions like around your plant
It can be conducted overwhelming the spectrum analyzer (although unlikely)
It could be large amplitude at an IF frequency (thus the broadband
everywhere symptom)
Might try a portable tuned receiver and start searching for the origin.
- Robert -
On
Scott:
Here's a couple of comments and suggested possibilities to investigate in
tracking down the source of your problems.
1. Check the turn-on time (not X-ray operation time) for the X-ray equipment.
The operator may turn on the unit, take one exposure, change film and set up
for a second
--- On Thu, 26 Mar 1998 13:14:35 -0500 Scott Douglas s_doug...@ecrm.com
wrote:
Hello Group -
Here's a problem for you all to think about and hopefully help solve.
I have a room in the corner of my building where I perform EMI pre-scans.
Occasionally throughout the day I have a major
The duration, and your location could point to a vehicular source, for
example a high power CB, or radio telephone in a vehicle.
__ Reply Separator _
Subject: EMI Site Interference
Author: s_doug...@ecrm.com at PMDF
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