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From: hoford@redwood.circ.upenn.edu (John Hoford)
Newsgroups: comp.sys.handhelds
Subject: Re: Digital Multimeter Front-End for HP48sx?
Message-ID: <42881@netnews.upenn.edu>
Date: 9 May 91 20:37:38 GMT
References: <1991May4.133115.11892@netcom.COM> <6910@acorn.co.uk>
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In article <6910@acorn.co.uk> asmith@acorn.co.uk (Andy Smith) writes:
>In article <1991May4.133115.11892@netcom.COM> feustel@netcom.COM (David Feustel) writes:
>
>>Does anyone know of a simple DMM front-end for the HP48sx that permits
>>the measurement of R,L,C,V and I values for electronic components? A
>>device with an IR or wire interface would be real popular with EE's.
>>-- 
>
>I don't know of a DMM front end for the 48, but I have been toying with the
>idea of a logic probe with trace facilities, and after Wlodek showed me a
>moving sequence of sine waves on his 48, I am also pondering the possibility
>of a simple 'scope facility.
>


The with a probe with trace or a scope is the serial port cannot input 
is not fast enough to read in the data in real time.

At 9600 baud only 9600 bytes can be read a second
Using an 8 bit digital to analog converter the max
frequency would be or 4.8 kHz.
This would be too slow for most applications.

A better solution would be a bord that used a slot
and had its own memory which it dumped the readings to.
The calculator could read the ram and
and display the images in real time.

Cost would probably be too high for me to buy.

John D. Hoford