[time-nuts] Extended length Phase Noise Measurements with TimeLab
john at miles.io
Fri May 3 17:01:54 EDT 2013
Yes, those messages are just there to warn users that if they try to record
multi-million point phase records, they may either run out of memory or
generate a gigabyte+ file that will be painfully slow to work with. The
warning threshold is quite a bit higher in the 64-bit version but it will
still pop up if you get too aggressive with the data rate and/or duration.
-- john, KE5FX
Miles Design LLC
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Bob Camp
> Sent: Friday, May 03, 2013 1:46 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Extended length Phase Noise Measurements with
> There are some warning messages in TimeLab about "runs with more than
> xx,xxx,xxx,xxx,xxx,xxx samples in them may harm poor fuzzy animals". I've
> routinely exceeded them with no obvious damage to the local environment. I
> may not have the wording of the error message quite right..
> If the resonance on the vibration table is enough to push the frequency
> a certain point, all of these boxes get a bit bothered. The 5120 is by no
> unique in that regard. The trip points vary from model to model. The ones
> seem to remember were in the 10's of ppm.
> On May 3, 2013, at 2:21 PM, Tom Knox <actast at hotmail.com> wrote:
> > Recently I was looking at a co-workers Lab View measurements taken with
> 5120A. She is studying vibration on Phase Noise. I asked how Lab View
> compared to TimeLab and she said in many ways she prefers TimeLab but ran
> into a problem. The research she is currently conducting requires
> data in extremely long measurement periods beyond the TimeLab limits. Is
> missing something? If not is measurement length an easy fix? One other
> problem during her project was related to the 5120A, occasionally the
> must hit a resonance and the 5120A stops measurement saying measurement
> parameters were exceeded. It would be nice to be able to adjust or disable
> feature. Thanks in advance for your ideas.
> > Thomas Knox
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