In message
, Randy Evans writes:
>I was concerned about the leakage through R1-C1.
Ideally there should not be any voltage across C1 because C2 "bootstraps"
it, so C1's leakage resistance should not matter at all.
>In all cases the leakage, as measured with a
>Keithley 414 picoammmeter
Yes I have relevant experience with Lifters, fingerprints generally are a
nightmare.
May also be worth mentioning that different grades of IPA are more or less
useful, it absorbs water
in its pure form so this needs to be taken into account.
Use "no clean" fluxed solder if possible as it works w
also see
https://workmanship.nasa.gov/lib/insp/2%20books/links/sections/407%20Splices.html
-Andre
From: volt-nuts on behalf of Randy Evans
Sent: 16 February 2018 18:39
To: Discussion of precise voltage measurement
Subject: [volt-nuts] Low noise referen
I bought an HP 4339B high resistance meter. It is designed to measure high
resistances (as the name suggests) and also low currents. It is essentially
a variable voltage source up to 1000 V, and a low current ammeter.
I got it from eBay, as non-working, with no output voltage. After paying
for it,
Thanks for the feedback. I don't think I am having problems with leakage
in the test setup, thermal, or shielding issues. I used aluminum cast
boxes (Pomona 2391) which have BNC M and F connectors, which use teflon
insulators. The cast boxes have enough thermal mass and not subject to
moving air
Hi David,
Am Sat, 17 Feb 2018 15:32:15 +
schrieb "Dr. David Kirkby" :
> In order to use the meter, I would obviously need to be able to make
> connections to it.
>
> Is there anyone here that knows what the triaxial (tri-axial?)
> connector in the attached pictures ? One picture is of the fe
Hello,
Are you familiar with the 2DW232, a Chinese zener? There is one particular
factory in China which is somehow producing exceptionally low noise units (much
lower noise than the LTZ1000).
There is an EEVBlog forum member who lives in China and has graciously
volunteered to perform group
Apologies, the last message went out before I was finished drafting it.
See these links:
https://www.eevblog.com/forum/metrology/ultra-low-noise-reference-2dw232-2dw233-2dw23x/
https://www.eevblog.com/forum/metrology/factory-2dw23x-order-aggregation-thread/
Note that these zeners are quite che
