From: "John Rehwinkel" <spam@...>
Reply-To: TekScopes@...
To: TekScopes@...
Subject: Re: [TekScopes] Coax BNC Cable Termination
Date: Thu, 5 Jul 2001 17:39:29 -0400
(snip)
1MHz signals
should tolerate a 30 meter long mismatch, and so on.
My humble twopence: Crappy rule of thumb! Few years ago while integrating an ATE we had a 1MHz square signal we thought it wouldn't need matching pretty much for the same reasons. Oh we were so bloody wrong and it took a while to figure it out. We did have to match that particular stretch of cable - 3 or 4 "lousy" meters of coax - down to 50 ohms (TDS420 alterative Zin) and through line drivers, keeping the signal below the scope's max input power rating. That's how we got it sorted.
Fernando
Portsmouth, UK
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