Nice picture My.
The PTS 3200 seems to be the source of the ASIAA ADC's sample clock.
The HP 8656A couldn't be a source unless there were frequency doublers
and amplifiers in the path.
If the picture of the back of that PTS3200 unit is current then I think
we need to get the 120VAC power cord connected before we do any other
debugging.
The note on the front prompts me to suggest we double check the 10MHz
distribution scheme.
Did a power cord drop out of the VAC inlet at the back of the PTS3200 ?
Matt
On Mon, 15 Nov 2021, My Nguyen wrote:
Date: Mon, 15 Nov 2021 08:56:07 -0800
From: My Nguyen <[email protected]>
To: Matt Dexter <[email protected]>
Cc: [email protected], Mo Ohady <[email protected]>,
Arthur Fung <[email protected]>
Subject: Re: Test fixture
Hi Matt,
Thanks for your quick response.
Here are the pictures of the test equipment you requested.
I add Arthur in the loop who will discuss the video meeting with you shortly.
Best regards.
MY NGUYEN
Digicom Electronics Inc.
7799 Pardee Lane, Oakland, CA 94621.Website: www.Digicom.org.
Direct Line : (510) 668-8443
Main line : (510) 639-7003
Email: [email protected]
On Sun, Nov 14, 2021 at 4:25 PM Matt Dexter <[email protected]> wrote:
Hi My -
I think you already had a good idea when you tried to check the
2500 MHz sample clock generator.
At the moment I can't remember the details of the 2500MHz clock
generator. But, I'd guess that it is programmable and if it is
then one test could be to program it to some frequency under
your o-scope's 200MHz limit and see if anything appears.
Such a frequency is much too low for the ASIAA_ADC but it would
give some indication if the clock generator works at all.
It's not unusual for signal generators to have a separate output
on/off button that is independent of the frequency and amplitude settings.
That output button has tripped me up in the past.
Even if you can get the clock generator to work at a low MHz
compatible with the o-scope that doesn't mean it will work at
the ADC's frequency. But if it did work that might help us
identify what is going on.
Can you please remind me of the part numbers for the 10MHz and
ADC sample clock signal generators so I can read their datasheets?
Do you have a laptop w/ camera you could bring to the ADC test bed ?
If so, we could schedule a zoom debug session.
If we can't get things working with a bit of remote debugging I can
visit Digicom w/ a spectrum analyzer and high BW o-scope.
I'll look around the lab to see if I can identify a replacement sample
clock generator should that be necessary.
Matt
On Fri, 12 Nov 2021, My Nguyen wrote:
> Date: Fri, 12 Nov 2021 10:32:23 -0800
> From: My Nguyen <[email protected]>
> To: Matt Dexter <[email protected]>, [email protected]
> Cc: Mo Ohady <[email protected]>
> Subject: Test fixture
>
> Hi Matt,
> I hope you are well and safe.
>
> We have an issue with the ASIA_ADC test fixtures and wonder why. We've
tested more than
> 100 boards a few months ago and all passed the test. Now it does not
have signal and have
> an error message (see attached documents). I've tried everything to
find out what is the
> root cause but no luck (retested the PCBA that passed before; changed
the Coaxial cable
> from Frequency Synthesizer to Signal Generator; measured 10 MHz at CN1
connector on the
> board). I could not check the 25000 MHz at the Frequency Synthesizer
output or at CN7
> connector on the board because our Oscilloscope is not capable (up to
200 MHz only).
>
> Sorry for any inconvenience but you are the only contact person for the
UC Berkeley
> project now.
>
> Thanks and best regards.
>
>
> MY NGUYEN
> Digicom Electronics Inc.
> 7799 Pardee Lane, Oakland, CA 94621.Website: www.Digicom.org.
> Direct Line : (510) 668-8443
> Main line : (510) 639-7003
> Email: [email protected]
>
>
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