Products > Test Equipment
R&S NGE100 voltage jumping around
<< < (4/11) > >>
ogden:

--- Quote from: justanothername on October 09, 2020, 05:15:07 pm ---@RBBVNL9 I have problems in a complete different time base than you. In my case it is drifting, over tens of seconds or minutes!

--- End quote ---
Exacty. You are trying to prove that your supply does not meet specs of unspecified long term drift :)
justanothername:
Yes that is why I need the help of the community to have a measurement to compare to. I need anything to put this back to R&S since yes, I made the decision to upgrade to this PSU und I myself have to fix this problem, my coworkers threw this unit back to me. At the moment nobody wants to work with this and its B2B, so no returns.
But I'm sure that this is not a normal behavior for a power supply that expensive.
RBBVNL9:

--- Quote ---@RBBVNL9 I have problems in a complete different time base than you. In my case it is drifting, over tens of seconds or minutes!
--- End quote ---

OK. Maybe I did not realise this well enough as you talked about noise (with I associate with short time spans) and this threat is talking about meeting the published specs (and the only specs in this respect are those on ripple and noise and given for 20Hz and higher only).

If the issue is longer term voltage drifting, then I really would be fascinated to see whether this is somehow related to the design of having a switching regulator first and a a linear control circuitry next. I don't know the details of the NGE design, but I wonder whether it involves some steps in the process, and these could possibly explain the behaviour you seem to notice. If so, then such issues may occur at certain (threshold) voltages and not at others. This all is pure speculation, however.


--- Quote ---Note that the measurement is ac-coupled, so voltage changes would look like spikes.
--- End quote ---

I guess that if we are to measure multi-second voltage drifts, AC coupling is not the way to go (especially if we don't have precise information on the ac decoupling characteristics of our measurement device). Rather DC measurements, and perhaps also ensuring that unwanted higher frequency AC components are filtered out effectively. Perhaps even charging a relatively large capacitor when longer time spans are of interest.

If you know what you're exactly looking for, I'd be willing to make the same measurement here using the same set-up and share with you what I get.
justanothername:

--- Quote from: RBBVNL9 on October 09, 2020, 06:47:05 pm ---If you know what you're exactly looking for, I'd be willing to make the same measurement here using the same set-up and share with you what I get.

--- End quote ---

Thank you for that offer. I guess it would just help if you connect a 5.5 digid DMM or better to the PSU and measure the voltage with 1 reading per second over a span of 2 minutes or longer.
Without load and optionally with 1mA and 100mA load. I have this behavior at all voltage ranges, but in this case the measurements are all done at 4V. I can repeat the measurements with any voltage if necessary.
ogden:

--- Quote from: justanothername on October 09, 2020, 05:21:30 pm ---But I'm sure that this is not a normal behavior for a power supply that expensive.

--- End quote ---
Nah. In this price range you get similar specs (20mVpp) from Keysight as well. Even worse - just 1 channel and much lower current capacity supply (E36104B). If you want low lower noise, then look for something like E36313A or NGL202. Also read the funny datasheets ;)
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod