[time-nuts] Interesting (meaningless?) measurement.

Magnus Danielson magnus at rubidium.dyndns.org
Wed Jul 31 09:03:34 UTC 2013


On 23/07/13 17:44, Brian Alsop wrote:
> The standard deviation using the 5335 internal oscillator is 0.39 nS.

Recall that the 5335A has a hardware resolution in their interpolator of 
500 ps, but effectively reports 1 ns resolution as both the start and 
stop contribute error.

Averaging will allow you to average when you have beating, but lacking 
beating your precision will not improve as you will keep hitting the 
same values with some minimum spread. Naturally could some input noise 
from a less than optimal trigger provide the needed spread too. HP5328A 
with Opt. 40 did a similar thing.

Cheers,
Magnus



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