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From: gingell@aurs01.UUCP (Mike Gingell)
Newsgroups: comp.sys.handhelds
Subject: Re: Digital Multimeter Front-End for HP48sx?
Keywords: HP48, Scope
Message-ID: <59825@aurs01.UUCP>
Date: 13 May 91 12:57:06 GMT
References: <1991May4.133115.11892@netcom.COM> <6910@acorn.co.uk> <42881@netnews.upenn.edu>
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Reply-To: gingell@aurw90.UUCP (Mike Gingell)
Distribution: comp
Organization: Alcatel Network Systems, Raleigh NC
Lines: 12

Following the discussion on using the HP48 as a scope, it would
be possible, despite the fact that the RS232 is slow, if you use
the same technique as is used in sampling scopes. These are used
for examining very high frequency waveforms and rely on the fact
that most waveforms examined are periodic. You sample the waveform
once every n cycles delaying the sample point slightly each time
until you have capture a picture of a complete period. It requires
a fast sample and hold, and A/D plus some clever timing logic.

Mike Gingell, Alcatel, Raleigh, NC USA  (919) 850-6444
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