[time-nuts] Counters for ADEV measurements

Azelio Boriani azelio.boriani at screen.it
Tue Oct 2 08:47:28 EDT 2012


Then you need a stable clock as a reference, OK, but the first move is
towards the smallest one-shot resolution. It is the same as your
multimeter: it is useless to have 6 1/2 digits resolution and a voltage
reference that wipens out the last 2 digits. The HP5345A has a resolution
of 10E-10 (page 2 of the datasheet) so it is not the best available for
precision timing measurements.

On Tue, Oct 2, 2012 at 2:40 PM, Azelio Boriani <azelio.boriani at screen.it>wrote:

> Searchin for the best clock characterization gear, the first parameter is
> the ability to sense the smallest time movement beetween clock edges. When
> you buy your top multimeter, you first decide about the resolution: 6 1/2
> digits (for example) is better than 5 1/2. Here it is the same: the
> one-shot time interval resolution is the key parameter.
>
>
> On Tue, Oct 2, 2012 at 2:11 PM, Geoff Blake <Geoff at palaemon.co.uk> wrote:
>
>> Whilst considering the best settings for ADEV measurements, could I
>> ask for views regarding the venerable HP 5345A counter/timer? I like
>> this counter, particularly regarding its ability to operate up to
>> 40GHz - with a suitable plug-in of course, and that I have two of
>> them!
>>
>> Thanks Geoff
>>
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