That's what I was thinking.? A ferrite bead is an inductor that is purposefully made to be lossy.? It absorbs high frequency energy while passing DC and low frequency energy.
Assuming the probe cable can be bent into loops without damage, you're probably onto something, John.
Jim Ford
Sent from my T-Mobile 4G LTE Device
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-------- Original message --------
From: "John Gord via groups.io" <johngord@...>
Date: 2/27/22 4:32 PM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Scoping the Power Rails [8566B]
Dave,
Adding ferrite beads to the ground lead itself will probably make things worse.??
However, threading the entire probe cable several times through a large ferrite can often help reduce noise due to ground differences between the oscilloscope and the unit under test.? A large, short, separate ground strap between the chassis of the two units also helps.
The "ferrite-turns-on-the-probe-cable" method was shown to me by a designer of multi-kilowatt vehicle drive inverters.
--John Gord
On Sun, Feb 27, 2022 at 02:05 PM, Dave McGuire wrote:
You could try slipping a few ferrite beads on the probe's ground
lead. I'm not sure that'd help, but it might; does anyone else have any
thoughts on that?
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
