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From: Mike Monett
X-Mailer: Mozilla 2.02 (Win16; I)
Subject: Re: Amplifying stage with *negative* Voltage gain??
References: <email@example.com> <3DEF1DC0.5EDD@Spam.Bots> <firstname.lastname@example.org> <3DEF5BEA.2614@Spam.Bots>
Date: Fri, 06 Dec 2002 08:20:34 -0500
NNTP-Posting-Date: Fri, 06 Dec 2002 08:20:37 EST
Organization: Bell Sympatico
Paul Burridge wrote:
> I think you've hit on something here. I've just re-checked with the
> X10 setting activated and the disparity between Vin and Vout has
> virtually disappeared. The new readings are 2.2 tenths of a volt for
> Vin and 2.4 tenths for Vout. Still a bit odd, though, since in C/C
> config., Vout should never be > Vin.
> Anyway, it looks like you've hit the nail on the head. Are we any
> closer now to identifying the underlying cause of the problem?
This was tony's suggestion. He is always right.
I can't figure out what you mean by "2.2 tenths of a volt".
If you are taking p-p measurements from the scope, you need to account
for the trace width and the fuzz caused by scope noise.
1. Adjust the triggering and horizontal centering so one peak is centered
on the center vertical graticule.
2. Adjust the vertical offset so the peak of the trace is on one
horizontal graticule mark.
3. Measure to the top of the fuzz on the negative peak.
This is called the peak-to-valley method. It subtracts the finite trace
width and scope noise from the reading.
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