I have another data point...
I have a not-recent Prologix. The PCB says GPIB-USB 3.12 I've forgotten
what version of the software it's using.
It works with a 5334B.
I have a 3457A. I can't talk to it with the Prologix. I don't know what the
problem is. It could easily be a busted 3457A.
mailto:[EMAIL PROTECTED]
> Behalf Of Chuck Harris
> Sent: Wednesday, November 28, 2007 7:43 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] OT: Prologix GPIB and HP3478A...The Answer!
>
>
> Hi Didier,
>
> I am more and more coming to the
Hi Didier,
I am more and more coming to the conclusion that my 3478A is just fine,
but my Prologix adapter is a victim of infant mortality.
It can't address my Tektronix 7854 either.
-Chuck Harris
Didier Juges wrote:
> I am aware of at least 2 more 3478 at my workplace, one of them actually has
iscussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] OT: Prologix GPIB and HP3478A...The Answer!
>
> 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 fa
ncy 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
>> a
arris
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
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,
Didier Juges wrote:
> Yet it works fine with mine, even with or without a number of other
> instruments on the bus, powered or not. I have not come across that problem
> with either the Prologix of the IOTech Micro488/P which also uses a
> microcontroller (Motorola 68HC705C4) to directly drive the
> > I need to clarify that I've helped Abdul with some testing now
> and again,
> > but have absolutely no other business relationship with him,
> other than the
> > fact that I happen to live in the same area, and regularly let him (and
> > pretty much anyone else who asks) drop by to use my test
--Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Chuck Harris
> Sent: Wednesday, November 28, 2007 1:12 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] OT: Prologix GPIB and HP3478A...The Answer!
>
>
> [mailto:[EMAIL PROTECTED] On Behalf Of Chuck Harris
> Sent: Wednesday, November 28, 2007 12:45 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] OT: Prologix GPIB and HP3478A...The Answer!
>
> Hi Abdul,
>
> Bear in mind that it isn&
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Chuck Harris
> Sent: Wednesday, November 28, 2007 9:47 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] OT: Prologix GPIB and HP3478A...The Answer!
&
From: "Poul-Henning Kamp" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] OT: Prologix GPIB and HP3478A...The Answer!
Date: Wed, 28 Nov 2007 21:58:59 +
Message-ID: <[EMAIL PROTECTED]>
> In message <[EMAIL PROTECTED]>, "John Miles" writes:
>
>
In message <[EMAIL PROTECTED]>, "John Miles" writes:
>Agreed, documenting this sort of limitation is pretty important, now that
>it's known. That said, his intent has always been one dongle per
>instrument, plugged directly into the back without any cables at all. The
>first few generations of t
In message <[EMAIL PROTECTED]>, Chuck Harris writes:
>Hi John,
>
>
>> I have run mine with at least a half-dozen daisy-chained instruments on
>> 20-30 feet of cabling with no problem at all. Some of the 8650-series
>> signal generators cause loading problems when they're powered off, but
>> that's
Ah yes! You gotta love it when the test instrument fixes
the problem ;-)
I recall hearing of a few instruments that had scope probes
built in to fix strange parasitic problems...
-Chuck Harris
Poul-Henning Kamp wrote:
> In message <[EMAIL PROTECTED]>, "Prologix" writes:
>> Hi Chuck,
>>
>> Good
Hi John,
> I have run mine with at least a half-dozen daisy-chained instruments on
> 20-30 feet of cabling with no problem at all. Some of the 8650-series
> signal generators cause loading problems when they're powered off, but
> that's true with the NI boards as well.
With the loading limits o
In message <[EMAIL PROTECTED]>, "John Miles" writes:
>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.
I fully agree.
--
Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, "Prologix" writes:
>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 th
> Hi John,
>
> I agree in part.
>
> If it is known that certain GPIB instruments are not supportable,
> then it is essential to have that documented fact easily available to
> the buyer. Thus far, the Prologix website, and documentation, make no
> mention of any possible limitations, or deficienci
Hi John,
I agree in part.
If it is known that certain GPIB instruments are not supportable,
then it is essential to have that documented fact easily available to
the buyer. Thus far, the Prologix website, and documentation, make no
mention of any possible limitations, or deficiencies. [For inst
Hi Abdul,
Bear in mind that it isn't proved that my HP3478A is working flawlessly.
It is possible that it has a flaw in its 488 drivers that prevents
them from ever putting pull ups on the bus. This wouldn't be noticed
with a controller that fully met the 488 standard, such as the one in
the HP8
27;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
, November 28, 2007 7:47 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] OT: Prologix GPIB and HP3478A...The Answer!
And the answer is:
My Prologix USB <-> GPIB Version 5.0 adapter has insufficient
pullups to drive my HP3478A DVM.
Once I put another (older)
And the answer is:
My Prologix USB <-> GPIB Version 5.0 adapter has insufficient
pullups to drive my HP3478A DVM.
Once I put another (older) turned on device on the bus, the Prologix
snapped to attention and works as it should.
Abdul, there is a very good reason why the 488 bus driver chips
exis
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