Electronics > Repair

Repair : HP 3245A precision DC/AC source

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TiN:
I added that  :D

alanambrose:
Any stats guys here who understand accuracy of noise calculation i.e. how many samples you need to get a given confidence level on the noise figure?

I see e.g. this:

http://web.eecs.umich.edu/~fessler/papers/files/tr/stderr.pdf

...and it looks like it converges fairly quickly.

Alan

TiN:
50 samples would be enough, based on results I saw so far.
Likely will be best to take 60 samples, and disregard first 10 (as some instruments may have some initial offset from range switch operation).

3roomlab:

--- Quote from: TiN on December 08, 2015, 02:10:12 pm ---50 samples would be enough, based on results I saw so far.
Likely will be best to take 60 samples, and disregard first 10 (as some instruments may have some initial offset from range switch operation).

--- End quote ---

ah ok, i get what the sterr.pdf meaning now you said 50. that plot on page 2 fig.1

dom0:

--- Quote from: deadlylover on December 02, 2015, 06:38:18 pm ---those Schaffner made in Switzerland ones are cursed.

--- End quote ---

To be fair it only affects the older ones with the RIFA MP2? caps. New Schaffner filters are as good quality as it gets.

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