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The rising edge and first few tens of ns after it look fine now but the dip just before its start doesn't. It's not serious but not nice either. From what I can see of the waveform, it probably

Hey Gary, I've never been inside one of those, so I don't know much about them - alas. Your problems do sound very much like what one gentleman went through on the EEVBlog <

This might be of help for some of you. I already successfully could control my CSA803 from my Linux laptop with a NI USB-GPIB-HS adapter. Now I also successfully used an USB to Serial adapter, both

When I recently acquired a 547 and an OS-245 (the milspec version of the 7603), the seller gave me some original manuals that I don't think I need. One is the 465B Service Manual. The other is the 454

Some additional information. Along with an error in level there is a positive offset of around two divisions. The 'scope will trigger only on line. At low sample speeds where the trace sweeps across

Thanks Siggi, I wrote that e-mail just before I turned off the computer last night. I should have added information about error messages. On power-up I get the following messages: Pass -- Powerup

Hey Gary, the NVRAM is checksummed, and if the NVRAM fails, the scope should display an error at power-up. If the scope is not displaying an error, then more likely this is due to SMD electrolytic

David, try switching the two probes on the channels that do this with the two that don't so you can check whether the problem is with the scope channels or with the probes. --Eric Sent from my Samsung

The thing is - I have 4 identical probes on this 4 channel 'scope - but only 2 channels do this. Regards, Dave

I believe this is normal. It will do this anytime you connect a probe that has readout scaling or power up with any connected. My 754C does the same thing. Dave Casey

Every time I power up my 'scope it complains that two (and only two) probes have changed and "do you want to use the existing cal data or re-cal". If I choose to use the existing cal data it works

My TDS-380 quit triggering today, along with some other odd behavior. It appears to still collect data and display it - if I set the sweep slow enough to have the trace sweep across the screen, I can

Thank you. Wish I could say It was done, but this scope is full of problems. Now time to figure out why single sweep is not working.

If that is 5ns/div then the risetime looks like ~3.5ns, which is what I would expect. It doesn't look like a termination problem to me; typically those vary according to the length of the cable. I

On Thu, Jun 21, 2018 at 12:27 pm, lop pol wrote: > > This the the rise time now at 5mV. I could probably get it better but but my > bnc cables and 50ohm terminator are not great quality. Should I keep

An ESR meter will not give you useful information here.? A shorted capacitor will read a low value, as will a good one.? A good test is with a simple Ohmmeter across the capacitors; a low resistance

Hi Fabio, Sorry, I replied to your post but see i must have clicked the wrong tab and it didnt make into the thread. I will have time to check some voltages tomorrow [after the Mexico World cup

Hi Jochen, Thanks for the info. Unfortunately, the CRT was no good anyway. I pretty much proved it by running it wide open, with G1-K shorted. I had measured the 2 kV (not very accurately, maybe

That summer it was pretty good it's quite common analog Scopes especially like the 475 for the intensity adjustments to slowly get out of whack. One has to remember the stresses on the divider change

Hi Ed, I am one of the developers of the HM 5005, and also the HM 5010. The focus problem may be linked to resistors in the 2000 Volt feedback path that have altered their value - they were at their