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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