[time-nuts] HP 5370B

[Didier Juges]

Mark,

The 5335 is specified at 9 digits/second of resolution, the 5370 is
specified at 12 digits/second.

That's 3 orders of magnitude better resolution. That brings up noise that at
9d/s is simply negligible.

My two 5370s are rock stable if I only look at the 9 left-most digits.

While it would be nice to have the same stability at 12d/s on the 5370 as we
get on the 5335 at 9d/s, that simply does not happen.

Didier KO4BB 

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of marks twotoe.com
> Sent: Friday, May 09, 2008 5:53 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] HP 5370B
> 
> Thanks Chuck,
> 
> 
> I found FEBO has an article on the 5370B here 
> http://www.febo.com/time-freq/hardware/5370B/index.html
> 
> As a footnote, my 5335A is rock stable sitting on 10 Mhz all day.
> 
> 
> Best regards,
> Mark
> 
> 
> 
> > Date: Fri, 09 May 2008 10:28:00 -0400
> > From: Chuck Harris <cfharris at erols.com>
> > Subject: Re: [time-nuts] HP 5370B
> > To: Discussion of precise time and frequency measurement 
> > <time-nuts at febo.com>
> > Message-ID: <48245F70.7040907 at erols.com>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > That is normal for 5370 type counters.  The are time 
> interval counters 
> > that can also measure frequency.  Frequency is not their 
> best feature.
> >
> > -Chuck Harris
> >
> > marks twotoe.com wrote:
> >> Could someone confirm if this behaviour is normal on a 5370B.
> >>
> >> When measuring the output of my standard the 10th and 11th 
> digits are 
> >> constantly changing.
> >>
> >> Do I need a 10Mhz low pass filter on the input of the 
> counter to get 
> >> an accurate result or should I just ignore this behaviour?
> >>
> >>
> >> Many thnaks,
> >> Mark
> >>
> 
> 
> 
> 
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