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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.