No matter how much averaging takes place inside the counter, in TI mode
the output resolution is limited to +/- 200ps (53132A) or +/- 500ps
(53131A) which appears to translate directly into the measurement limit
/ noise floor.
Adrian
Azelio Boriani schrieb:
Hmm, the frequency mode sigma is the same as the TI mode sigma for 200*tau.
That is if I take the sigma at 200*tau from the TI mode I have the same
figure of the frequency mode. Maybe the frequency mode 2 seconds sample
time uses 100 averages per second.
On Tue, Oct 2, 2012 at 1:50 PM, Timeok <[email protected]> wrote:
correction: HP53132A
timeok
Il 2012-10-02 13:29 Timeok ha scritto:
test using HP53123A:
The pink line is the noise floor using the TI mode
The blue line is the noise floor using the Frequency mode (gate 2 sec)
The other two line are the same oscillator, an HP105B tested with
both the modes.
As you can see the range between 1 and 200 sec is "totally
compromised" by the system noise floor using the TI method.
The approximation using the freq mode can be anyway usefull to make a
comparatinon between two source.
I suppose to have right measurements, without any restriction we have
to use the Timepod or other high level instruments than this kind of
counters.
Luciano
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