[time-nuts] Frequency counter recommendation

[Bob Camp]

Hi

Which is why a simple / cheap opto isolated RS-232 connected to a USB dongle makes a lot of sense.

Bob


On Dec 19, 2010, at 3:57 AM, Poul-Henning Kamp wrote:

> In message <28E8C13C-3227-4CD6-BBEA-902F03C81243 at gmail.com>, bownes writes:
> 
> One of the big problems with "PC-instruments" is isolation: most of them
> havn't any.
> 
> If you are going to design one such, remember to isolate the USB
> port galvanically from the actual instrument...
> 
> -- 
> 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.
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.