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Hi H?kan, After your post I re-read the two pages you provided but I still do not see the headline on the first page that says Universal Load Unit. I think ULU must be defined on a different page

Hello Siggi, Thank you for your suggestions, I'll try checking the leakage in the store capacitors (10MOhm probe is ok for that IMHO). A1 board was repaired ("butchered" by me) from above without

Chuck, Regarding the ROMs it's certain that the thing is hand-written in ASM (but not macro ASM). Looks like the work was spliced between the team and they have put almost the double effort into

My point is that the DAC calibration procedure is performed against the DLY REF 0 output of the A5 board. If everything's OK, this should be directly buffering the DAC's (voltage converted) output. If

I have always been afraid to look into the ROM on these scopes. I like to think nice thoughts of Tektronix, but there really is no excuse for the rough edges the "A" and "B" scopes have... Maybe you

"I little type" -> A little typo bloody autocorrector!

I little type: instead of "Can put the delta cursor over the 11th vertical division or a bit further right!", please read "I can't put the delta cursor over the 11th vertical division or a bit further

Siggi, In the given code snippet, the X register is 16 bit and the full 16 bit write is performed. The DAC port has two bytes: 0x87F for the MSByte and 0x880 for the LSByte. The X register is loaded

Victor kindly please advise me via email once your filters are available for purchase on ebay as you indicated. Thanks. -Alex

Funny, this is two codes off from my derivation of the voltage, from assumed 1.36V & -1.25V references. This is a 12 bit DAC, do you ever see the remaining nibble written? R2520/2521 are both

I did it and it went bad, not sure what happened, but I believe the voltage got pulled too low when using the programmer to read and it erased/corrupted the DS1225. Possibly the control IC itself

How about Universal Load Unit referring to the 067-fixtures mentioned in the headline of the first page. /H?kan

On Fri, Oct 12, 2018 at 12:54 AM, Jim Olson wrote: > > This is for the folks here that are a lot more knowledgeable and experienced > than me with these 4xx series scopes with the testing and

After the code disassembly, seeing that the FW writes 0xAC to the DAC for the U2521 channel 0, the reference voltage on TP2421 is supposed to be 1.24692V but I measure TP2421=-1.2524V, which is

Thanks, downloading and I will evaluate it. Wouldn't have thought of that one. Mine's written in Lazarus Pascal, which is my preferred "goto" for windows style programming. For microprocessors

Q181 on the sweep and z axis board was not seated properly. I have no idea how

Hi, I am a new comer in the forum with little experience, but I have tried fixing various problems my old 465B had. It's channel 1 had jitter, the trace vertically changing position at random, by

You could try: <https://github.com/bsdphk/PyRevEng> -Chuck Harris Harvey White wrote:

What happens in a technical sense is that the circuit is set up with a (much lower) short circuit current limit. When the overcurrent happens, the circuit "folds back" to the point where the

I love the definition of "Fold Back Current Limiting " ...Dennis you are so right, the fuse always survives...LMAO....thanks I needed that... Renée, K6FSB