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Hi Raymond, The Op manual p 9-43 only considers "premature termination" by the STOP command. After normal termination missing data are filled by linear interpolation. (Though I think I also read

It is best to give this step some time, doing it deliberately, since any accidental shorting out with probes can cost you lots of repair time. Each of the places just downstream of rectifiers and

Hi Nick, It's more than just a recommendation to check power supply (PSU) values first and make sure they are OK: You can expect virtually anything with bad power supplies, including intermittently

Thanks for that, Paul. Moving what I wrote earlier into this criterion: What if the comparison is corrupted, IOW the acquisition thinks it's >= 99% done but in reality, it isn't? Raymond

Nick - The alignment pattern working would seem to indicate the CPU can read & write RAM just fine, nor are their issues from the CPU to the DACs. I'm pretty sure the digitizer writes directly to RAM,

Be aware that there is a secondary power supply for the digital stuff which lurks at the front of the scope. It's quite likely if there is a PSU problem that this is the one that is the culprit given

Raymond: You are correct, I have not gotten to check the power supply yet. For one I've so far had some issues finding what exact values I'm looking for (ie. acceptable ripple value) in my service

I never saw confirmed that you followed Dave Casey's, Chuck's and my suggestion that you may have a power supply issue. Check with DVM *and* with a 'scope. Raymond

@Albert - No big (or any?) changes to the sampling system between 'old' and 'new', so I am genuinely flummoxed about why I'm getting different results in terms of how fast a complete acquisition can

I'm slowly going through the issues with my 7854, at the moemnt I'm chasing a problem where, after being on for some time, the mode selection switches stop working, all I get is a beep from the

Sounds like you have a power supply ripple issue. -Chuck Harris Raymond Domp Frank wrote:

There’s kind of a good write-up at: http://www.chichak.ca/file/Tek_TWD120.html Picked one of these units up new in the box about 12 or so years ago to play with. Didn’t have a laptop with an

... meant to say digital logic world, or digital logic, or digital electronics, anything you like, just pick at random. Raymond

Some would argue randomness doesn't exist - full stop, nor does a digital world. Thanks for that, Chuck. So the 7854 uses (pseudo) random sampling? If something is wrong with the pseudo random

Most humans are a lot more random than a PRNG! :) David

Randomness doesn't exist in the digital logic world. The scope knows how many pseudo random numbers it takes before the pseudo random sequence repeats, and waits that long... From the operator's

How does the 'scope decide AQR is complete, if samples are taken randomly, out of order? Or are they not taken randomly, just at a slow pace, just at subsequent scans? I guess it's RTFM-time again for

Ouch, it happened again! Nick tells us about his intervention so that part of my answer falls through (RTFM). The repetitiveness in the random garbling remains though (I guess...) Raymond

I've only superficially followed parts of this thread and now watched the video. It's normal that during acquisition, the readout characters are being garbled in a way that looks random, we know that.

Hi Holger, Nice work! I like the idea of giving commands via that keyboard at the scope in stead of the PC. Perhaps I will do similar with my 7854/GPIB. So far I gave commands via the PC, but the PC