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

Daun Yeagley daun at yeagley.net
Wed Nov 28 20:45:06 EST 2007

Well, I have a 3478A, but unfortunately not a Prologix. If I get my hands on one
I could add a data point.
Personally, I think there is a fault in that particular 3478's driver chips.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf
Of Chuck Harris
Sent: Wednesday, November 28, 2007 8:06 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] OT: Prologix GPIB and HP3478A...The Answer!

Didier Juges wrote:

> I would like to make sure we find out where the problem is. I agree with
> John that the Prologix has proven to be dependable and that the design
> approach was a reasonable compromise. Measurement Computing sells a GPIB
> driver chip that is in a small surface mount package, but it costs more than
> the Atmel chip Abdul is using, and it's just a driver.
> Didier

Making changes for the sake of making changes is probably a folly.
The Prologix concept is sound the way it is, but it should have some
mention of the known limitations.

It would be nice if we could find a couple of other folks that
have 3478's to test with the Prologix unit.

Because the 3478 uses 75ALS160/161's, it could have the tristate/pullup
modes selected by the microprocessor.  So it could be a part failure,
or a firmware problem.

I will try and determine which is true, but it will have to wait for
a while.

Thanks to all for their help and input into my problem

-Chuck Harris

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