[time-nuts] Advice on 5370A vs 5370B differences please
John Allen
john at pcsupportsolutions.com
Sun Aug 30 02:41:00 UTC 2009
Hi Tim - I don't have the app note, but the HP Journal article is on line
at, among many locations:
http://www.gamearchive.com/General/Test_Equipment/HP/HPJMay77.pdf
Regards, John K1AE
PS: I think that the availability of logic analyzers in the late 70's may
have affected the adoption of signature analysis.
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of swingbyte
Sent: Saturday, August 29, 2009 10:27 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Advice on 5370A vs 5370B differences please
Magnus Danielson wrote:
> swingbyte wrote:
>> Poul-Henning Kamp wrote:
>>> In message <72C46D68028C463EBDB775EE14FB9578 at LapTop>, "Roy Phillips"
>>> writes:
>>>
>>>> Tim
>>>> I have recently acquired a 5370B and find your comments of
>>>> interest. So in addition, what was the intention of designing the
>>>> mother-board to have no less than three additional (and in my
>>>> case,unused) pcb slots following the uP and Display interface,
>>>> marked ROM, MEM(optional) and SERVICE(AID)
>>>>
>>>
>>> The backplane is the same as in the 5370A.
>>>
>>> The SERVICE AID is mentioned in the manual, amongst other things it has
>>> two D/A converters so you can watch the address bus on a X/Y scope.
>>>
>>> The optional MEM I have not found any references to, but the 5370A
>>> might
>>> have its ram there.
>>>
>>>
>> According to the manual, the 5370A has its ram on a separate card. I
>> think these units use a bit of power - this might explain the heat.
>> I'm none to sure as to how useful the service aid would be. I
>> remember a project in a mag about these back in the '80s and suspect
>> that like the signature analyser, they were experiments in digital
>> circuit troubleshooting. I haven't seen the technique used
>> extensively. ( at all ). It is a bit like a real time software
>> profiler - I have seen it used but the usefulness was not too great.
>
> HP had an interesting signature based analysis instrument series (I
> have one of them) and it was used in a series of instruments if you
> look in the manuals. I think it is an interesting approach to fault
> analysis, but it certainly not eliminate the traditional schematics
> and descriptions.
>
> Fluke also made DMMs with the same signature analysis technique built
> in. I gave those away as I thought I had what I needed.
>
> Cheers,
> Magnus
>
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Yep I have a 5006. I think signature analysis is a great way of
troubleshooting. Its idiot proof and perhaps best for production line
checking of correct operation of completed units. I guess the advent of
FPGA absorption of complex logic rendered SigAs obsolete with test
vectors simulated in software. Does anyone have a pdf of the HP app
note about how to design for Signature Analyser testing they could share?
See you later.
Tim
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