ORIGINAL MESSAGE:
At 01:59 PM 3/13/2006, Will Matney wrote:
>All,
>
>Some on here were wondering about operating a scope correctly and
>what everything does. I dug out an old book I've had since I first
>started in this that I got from a cousin back in 1980. The books
>title is "Oscilloscope Handbook", and was written by Clyde Herrick,
>copyright 1974 by Reston Publishing. The ISBN number is;
>0-87909-597-0. It talks about every aspect of the way a scope works
>from the CRT, each circuit section, and how to use it. There is a
>good chapter called "Signal tracing and troubleshooting
>proceedures", that will be of interest. It goes on with TV
>troubleshooting in the next chapter, then scope maintenance.
>
>Best,
>
>Will
*********** REPLY SEPARATOR ***********
I don't have the book, so perhaps this is covered: One of the
cleverest tricks with an oscilloscope, if it is a dual-channel type,
is to ADD the two channels together while INVERTING one of them. This
allows the two probes to be used in a differential mode, i.e.
measuring the difference between the probe tips. The advantage is
that no ground connection is required, believe it or not. Since most
scopes have their chassis - and the probe ground - connected to the
AC mains ground, this allows you to measure AC mains voltages without
having to float the scope chassis above ground.
This may not be a mode you will use every day, but when you do need
it, it is very handy.
73, Bill W6WRT
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