Re: how to raise input impedance of small signal

From: John Popelish <jpopelish@xxxxxxxx>
Date: Mon, 05 Sep 2005 10:52:58 -0400

eehinjor wrote:

Thank you.John.
I used a voltage meter to measure the signal.

How do you know that the input voltage did not load down from 3.3 mV to 2.5 mV when you attached your meter? Did you measure the opamp output voltage while the meter was attached to the input? .

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