[time-nuts] Frequency counter recommendation
Bob Camp
lists at rtty.us
Sun Dec 19 15:33:16 UTC 2010
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.
>
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