[time-nuts] time-nuts, frequency counters

Tom Van Baak tvb at LeapSecond.com
Fri Oct 5 14:13:43 EDT 2007

> I am using an HP53132A, and I can program an offset and a scale factor. I use 
> to measure 10 MHz, so I program an scale factor of 1E-7 and offset of -1, so 
> it displays relative offsets in a very pleasant way.
> Regards
> Luis Miguel Brugarolas

That's a good point. In addition, the 53131A/53132A output
the full resolution of the measurement over GPIB / RS232
regardless of the number of digits on front display. And, if
you enable statistics (effectively extending the gate time),
you get even more digits.

Here, for example, is an excerpt from a set of 60 10-second
readings made by a 53132A. The mean frequency is given
to 14 or 15 digits:

10.000,000,000,190  MHz
10.000,000,000,224  MHz
10.000,000,000,170  MHz
N      : 60
STD DEV: 29.8 uHz
MEAN   : 10.000,000,000,204,3 MHz
MAX    : 10.000,000,000,279  MHz
MIN    : 10.000,000,000,148  MHz
10.000,000,000,215  MHz
10.000,000,000,191  MHz
10.000,000,000,181  MHz


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