[time-nuts] OT: Prologix GPIB and HP3478A...The Answer!

John Miles jmiles at pop.net
Wed Nov 28 13:45:38 EST 2007

Interesting point there.  I seem to recall quite a few pullup/pulldown
options in the Atmel port-configuration registers; this may just be a matter
of selecting a mode that looks more like the resistor configuration Chuck

Personally, I think it's fine if you support only 99% of the GPIB devices
out there and leave the remaining 1% to the competition.  Your boards have
proven compatible with an incredibly-wide array of instruments at this
point.  If the 3478A problem can't be fixed in software, I think the best
answer is, "Sorry, we don't support that one, here's a refund."  It
certainly isn't worth adding more chips (and cost) to the board IMHO.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Prologix
> Sent: Wednesday, November 28, 2007 10:25 AM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] OT: Prologix GPIB and HP3478A...The Answer!
> Hi Chuck,
> Good work identifying the problem! Leaving out the bus driver chips was a
> conscious decision based on available board space and was not
> made lightly.
> Extensive testing had shown that not to be an issue, so far. In
> fact, yours
> is the first reported case of a drive related problem. However,
> we consider
> even one incident to be one too many, and will be revisiting the decision
> during a future release.
> Thank you for brining this to our attention.
> Regards,
> Abdul

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