Derek,
In this frequency range the combination of the low limit and the 40 or 50 dB
coupling factor from the directional coupler is killing your sensitivity. I
would suggest that in this frequency range a directional coupler is totally
unnecessary, you can use a coaxial tee and connect an ordinary 1 MOhm input
oscilloscope off the tee.
That should work for all BCI-type limits - note the following worst case
example. A 1 V/m BCI limit at 10 kHz would be 23.5 dBuA. Driving that much
current into a 50 Ohm calibration fixture would mean 23.5 dBuA + 34 dB Ohm =
57.5 dBuV. But at this low frequency your injection clamp insertion loss is
around 30 dB (ubiquitous 95236-1 clamp), which means you would be putting 57.5
dBuV + 30 dB = 87.5 dBuV into your clamp, around 24 mVrms, 67 mVp-p. Easy to
see on your scope.
Ken Javor
From: Derek Walton lfresea...@aol.com
Organization: L F Research
List-Post: emc-pstc@listserv.ieee.org
Date: Sun, 5 Sep 2004 15:14:18 -0500
To: emc-p...@ieee.org
Subject: Power Meter to read down to 10 kHz
Hi Folks,
I'm trying to improve my Conducted immunity test method when testing from 10
kHz to around 200 kHz. The signal from the diredctional coupler is quite
small, around -20dBm, and my current power meter sensor is on the limits of
it's range.
Can anyone suggest a power sensor for use with the HP 437B ideally, that can
measure down to -30 dBm and at least 10 dBm, with a freq range of 10 kHz to
400 MHz?
If no such sensor exists ( and I've not found one... ), can anyone suggest a
power meter/sensor combination. I only need a single channel, but two channels
would be OK too.
Thanks,
--
Derek N. Walton
L F Research
Poplar Grove, IL 61065, USA ---
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