Hi Adrian,
I had the Tracor and I say the instability is normal. Every decade
multiplication is affected by noise introduced by the circuit it self. I
think is a good, fast approach to evaluate the oscillators or adjust the
frequency but not so affordabe for precision measurements
Luciano
Il 2012-10-02 14:43 Adrian ha scritto:
Timeok schrieb:
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
Hi Luciano,
interesting. So, the 53132A gains a lot more by this method than my
53131A.
As Magnus pointed to, there might be pitfalls. So, it would be
interesting to have comparative measurements from a non questionable
test setup.
In the meantime I tried a Tracor 527A which greatly improved the
dynamic range, but appears to suffer from serious instability that
might or might not be normal.
Adrian
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