In message 7d58cf6b-25de-4e7d-9570-e512a22aa...@email.android.com, Didier wri
tes:
What is the bandwidth of the measurement?
Very low.
The measurements show here are made with an RC lowpass filter (5k/1µF)
on the output, but it doesn't change the statistical properties of
the noise at all.
In message 5174699e.9060...@sasktel.net, Ed Palmer writes:
I think that Vref is derived from the internal voltage regulator that
powers the oscillator. Is it possible that any noise will appear on
both and therefore, they'll cancel each other out? That could even
reduce power supply
Poul-Henning,
your finding is quite interesting. I would like to replicate your
measurements on some other voltage sources and Vref sources.
Could you please elaborate on the setup, settings and acquisition
process?
Thank you,
Jochen
___
In message trinity-7a7ee757-89f7-4b92-8884-9435668fef15-1366646349138@3capp-gm
x-bs21, Jochen Frieling writes:
your finding is quite interesting. I would like to replicate your
measurements on some other voltage sources and Vref sources.
Could you please elaborate on the setup, settings and
On Mon, 22 Apr 2013 16:13:17 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
In message trinity-7a7ee757-89f7-4b92-8884-9435668fef15-1366646349138@3capp-gm
x-bs21, Jochen Frieling writes:
your finding is quite interesting. I would like to replicate your
measurements on some other voltage
Ok, this surprised me a LOT!
I used my HP3458A to measure the stability of the Vref output from
an IsoTemp OCXO-107 and the results were anything but stellar:
The OCXO's Vref has 18 microVolt RMS noise
For comparison my HP6626A power-supply has 2 microVolt RMS noise.
Obviously, the Vref only
The OCXO's Vref has 18 microVolt RMS noise
I used my HP3458A to measure the stability of the Vref output from an
IsoTemp OCXO-107 and the results were anything but stellar:
Neat. Thanks.
What's the spectrum look like and what's the bandwidth of the filter inside
the OCXO? How much of
I think that Vref is derived from the internal voltage regulator that
powers the oscillator. Is it possible that any noise will appear on
both and therefore, they'll cancel each other out? That could even
reduce power supply sensitivity.
You could test that by measuring ADEV with an EFC pot
What is the bandwidth of the measurement?
It may be some broadband noise that is filtered by the OCXO
Didier KO4BB
Poul-Henning Kamp p...@phk.freebsd.dk wrote:
Ok, this surprised me a LOT!
I used my HP3458A to measure the stability of the Vref output from
an IsoTemp OCXO-107 and the results
