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If I were undertaking a project of this sort, I would not attempt to digitize the analog display. Instead, I would use a DAC to program the collector (drain) voltage and another to program the base

WRT the horiz/vert signal pick-off for digitization, there is a nice clean demarcation point on the 577 RHS of schematic 6, where the outputs from U530 and U570 drive the output amplifiers. At this

I assume that the newer 57x curve tracers use cam switches for selecting voltage and current ranges, and I think I understand how Tek piggybacked readout onto those cam switches (by reading the

apply the graticule pixels to the final frame buffer on the display update, don't keep them in the "accumulating/integrating" buffer.

Oops... apologies: ( .... before I get flamed !! (yikes ! ). The obvious place to tap-in to the CRT signals would likely be at the low voltage H & V deflection amps, as suggested in the original 576 -

Would still need to differentiate between graticule pixels and curve pixels. Just a thought

Once it gets into the FPGA, it's all digital, so with access to that memory, you can get the screen dots out (I'd be very tempted to use two memory planes) and scale them with a processor.? Going

Just gonna throw this out there: GPIB? --T

I would not bother with the queue; I would simply map the ADC values (X and Y) into a 2D pixel array, accumulating a "bright" pixel value to the existing value at the pixel location, and periodically

Harvey, Also if all the data is digital as well it would be a nice to have to be able to dump out a screen cap to flash somewhere. The good news is there quite a bit of space available once the tube

Rick, I would not mind putting effort behind a project like this. I have a perfect test chassis here in the lab as well. A fully complete 576 with no tube and a dead HV transformer. Moving to a LCD

If I were to try that, I'd first look at flash a/d converters, at least 8 bits if not more.? That gives you a digital output of the X and Y channels (scale input first!).? For an FPGA, I'd suggest

That's PIC17C42A 33MHz PLCC in Industrial or Extended Temperature range Must be unused as they are OTP parts. Thanks David

hi Walter, I have been thinking about a possible replacement video display panel for the Tek 576 CRT : It would require some cpu or processor ( A/D, logic, etc.) to translate, format and communicate

Okay - I see that in the parts list now. It isn't shown on the pictorial diagram and I don't see it on at least one of the boards I have either. It's listed as "NOMINAL, INSTALLED, TEST SELECTED" so,

it is a ferrite core which prevents high frequency oscillations, I believe. G?ran

In the manual for the 7B53A/7B53AN, the #2 schematic for the Main Trigger Generator (for SN B209999 & Below on page 124 of the version of that manual I'm viewing) shows a small rotated rectangle

You linked to the black one which only goes up to 16mm. It doesn't matter. It proves nothing. The fact that some fly by night corner shop in China doesn't have a specific screw doesn't mean someone

The usual rule for fault finding is 'first check all low voltage DC supplies for correct voltage and ripple'. Particularly relevant in this case! It is not clear why you have two spots. Are you

Mark, Thanks for the rundown. I have not tried again to address the TIME/DIV issues on the new 7B92, concentrating instead on diagnosing the old 7B92 by swapping boards (I will get to the new 7B92 in