>
>>>> wb8rcr@ARRL.NET 11/24/03 12:21PM >>>
>Keep in mind that you need at least 2, preferably 10 times the highest
>frequency of any signal you plan to look at, if you care at all about seeing
>the shape.  Remember your old buddy Fourier ... if you put a theoretical 1
>MHz scope on a 1 MHz square wave you will see a sine wave of something less
>than the square wave's amplitude.  A real scope isn't quite that bad,
>typically they fall off 3dB per octave, but you still won't see anything
>like a square wave.

Also, the rise and fall times of that square wave, will be rather less than square!

A 100 MHz scope is pretty much required to see anything in this range accurately.

My scope is my main tool, second only to my PC.  Spend till it hurts :)
Hamfests are your friend.

Digital storage is really, really handy!


Lately, I've fallen in love with my PMD-1208LS from measurement computing.
It's a USB pod that gives me four differential, or eight single-ended analog inputs, and two banks of eight digital inputs or outputs (I/O programmable per bank) and two analog outputs, plus a 32 bit counter.

I drive it with a visual basic front end, and I'm using it to help develop my AVR based battery charger code.

The Tek DSO isn't well suited to displaying events that take two hours to happen, and I use it for grabbing diagnostic output on a single spare pin, from a routine called "pong" which sends a byte in the form of wide and narrow pulses. 0xA5 would be WNWNNWNW  Very handy, but only with a DSO to catch it!

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics