[time-nuts] Typical HP 5370B resolution ?
bruce.griffiths at xtra.co.nz
Mon Mar 4 04:53:29 EST 2013
Not quite, the contribution to AD of a gaussian jitter source is SQRT(6)
times the rms jitter.
Ulrich Bangert wrote:
> given the fact that the measurement results of a 5370 are integer multiples
> of 20 ps it is absolutely natural to see these steps in a phase plot, at
> least if the input signals are not bad conditioned. I guess however the
> question for the "typical" 5370 resolution was not whether these steps can
> be seen or not but was after what the device offers as its effective
> resolution. If you look at the AD plot of your Timelab measurements you will
> see a much higher number than 2.0E-11 @ 1 s and the number that you see in
> the AD plot should be considered the effective resolution because it
> reflects the basic resolution as well as the trigger noise.
> Best regards
>> -----Ursprungliche Nachricht-----
>> Von: time-nuts-bounces at febo.com
>> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Mark Spencer
>> Gesendet: Sonntag, 3. Marz 2013 18:49
>> An: Discussion of precise time and frequency measurement
>> Betreff: Re: [time-nuts] Typical HP 5370B resolution ?
>> Thanks all for the suggestions.
>> I am typically measuring 5 or 10 Mhz sine waves with levels
>> between 1 and 4 volts peak to peak into a 50 ohm load.
>> To expand on my first email with suitable input signals I
>> can see the 20 ps resolution of the HP5370B on a "strip
>> chart" from time lab without any further effort. So far
>> other than re seating the cards (which cured some lock up
>> issues on a few of them) I haven't really done any
>> maintenance to my HP5370's. I'm also using a 5 Mhz BVA as
>> the reference oscillator for the HP5370B's in question which
>> seems to improve things vis a vis the internal 10811's. At
>> some point when I have some more time I'll delve into the
>> reference oscillator matter in more detail as I'm a bit
>> surprised at this.
>> Magnus your suggestion to try attenuating the input signals
>> makes a lot sense and I will try this as different signal
>> levels do seem to make a difference.
>> Re the other recent post re cable issues I've also
>> encountered similar issues in the past and typically use
>> RG400 double shielded cables.
>> Regards Mark S
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