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That 108 is the pre-regulator voltage. I don't think that ripple is of great concern. There's not a lot of bulk capacitance on the 108 because it is the feedback to the inverter controller (A12U75),

Alright I've checked all the power supply test points I knew the location of (A12,A22,A17) Except I didn't get that digital supply David mentioned, which I'm not sure where the test points are, how to

But don't the Tek part numbers sequences typically start at x100001?? To me, that means 772 were sold before the update, and I doubt they sold many P7001s after 1980; they were getting fairly old at

Martin - I'm no 7854 expert, but I've been poking around in a few lately, and the manual has been my bedtime reading material, so I know just enough to be dangerous. That being said, a few thoughts:

Right - I don't think it knows if it's good data or bad data, only that it got filled up. I'm haven't figured out how yet, still making my way through the manual. I know it's also counting sweeps, but

Hi Tim, I have a P7001 Manual with dated MCI (06-17-80) for SN B100773 and above. Thus it seems thousands are sold. Greetings, Egge Siert

Hi Albert, That's when the 'scope is healthy. In the video, it seems that acquisition proceeds to a certain stage, then sort of repeats, as can be seen in the periodicity of the pseudo-random garbling

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