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

John Ackermann N8UR jra at febo.com
Thu Nov 29 02:24:57 UTC 2007


Daun --

Guess who you see frequently who has a Prologix you might able to borrow...

John
----

Daun Yeagley said the following on 11/28/2007 08:45 PM:
> 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.
> 
> Daun 
> 
> -----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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> 
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