[time-nuts] Slightly OT: inexpensive USB analog-digital converter?

Poul-Henning Kamp phk at phk.freebsd.dk
Fri Jan 18 14:30:48 EST 2008

In message <20080118191520.44322BE34 at ip-64-139-1-69.sjc.megapath.net>, Hal Murr
ay writes:
>>>Measuring current gets tricky.
>> Actually not, there are several good chips like the INA197.
>Mostly, what I was trying to point out is that measuring current probably 
>won't work well with a simple off-the-shelf general purpose A/D via USB setup.

If you hook it to a Hall based current-sensor like the LEM LTSR, then
there is no problem with it.

>If you were going to build a gizmo for this sort of work, what would you 

Actually, I am building a gizmo somewhat of that sort:  A DC power
system for my lab, which can deliver a battery backed +12VDC and +28VDC
via switched, metered outputs.


Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

More information about the time-nuts mailing list