John,
In putting in this effort in to a 576, retrofitting it for an LCD display rather than a CRT. A requirement for this project in my mind will be to delete the need for the HV transformer. This would open up the field significantly if a display could be fabricated as well as not need the -4kv and 200 Vdc supplies. It would extend the life time of the units significantly.
Zen
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-----Original Message-----
From:
[email protected] <
[email protected]> On Behalf Of John Griessen
Sent: Monday, May 2, 2022 10:48 AM
To:
[email protected]Subject: Re: [TekScopes] Saving 576 plots (again)
On 5/2/22 08:30, Eric wrote:
I think in the rigol world last time I tried it the best resolution I
got on the input is 10's of mV steps. So you would be able to get
close but there might not be enough adjustment on the digital scope.
At higher price points this is less of an issue of course.
In a hypothetical. If I aligned a 576 with the built in tube. Then
took a scope and tapped the vert and Horz signals for X-Y. I would
want to do a full realignment of the circuits to the new graticule.
Your earlier idea of using an LCD screen instead of borrowing a scope screen leaves off the electrostatic CRT display and limitations of 60 Hz AC sweeping. Two ADCs are needed, one for V one for I. and some code to overlay the up and down sweeps of collector voltage, then stop acquiring til next sweep, display the curve with "graticule" scale marks and V/div, I/div labels, and make this available to output as text data, or as an image file over the USB port. The text data is easier, (less code to write), and just pipe the data to gnuplot at the computer connected to the curve tracer. The culture shock schematics can give you an example system that is similar to look at for ideas.
The HV board layout is helpful to see how the HV is divided down to record it:
