If I have a GPS receiver with output pin of both 1pps & 10KHz, a Rubidium clock
of 10MHz, and a signal generator. How can I determine their Allan Deviation? I
know the math formula, but my problem is the data collection.
I am looking through internet so far. It seems the standard way to determin
In message , zzsili...@post.com writes:
>If I have a GPS receiver with output pin of both 1pps & 10KHz, a
>Rubidium clock of 10MHz, and a signal generator. How can I determine
>their Allan Deviation? I know the math formula, but my problem is
>the data collection.
Presuming you have a co
Hi
Ok, first a step back:
At one second your GPS ADEV will be in the 1x10^-9 to 1x10^-7 range depending
on the unit you have.
At one second your Rb will be somewhere in the 1x10^-12 to 1x10^-9 range
depending on the unit you have.
If you compare them against each other, the number you get w
Dear ZZ,
To measure phase noise or Allan deviation or other type of measure you need a
Reference to compare the DUT, device under test.
This reference have to be better performances than the DUT we can suppose have
to be ten time better than the DUT and in case of a GPSDO a good source can be
a
internal 10811 to clock the 5370A. I noticed the same on my 5335A.
Bob
From: Poul-Henning Kamp
To: Discussion of precise time and frequency measurement ;
zzsili...@post.com
Sent: Saturday, August 1, 2015 4:19 AM
Subject: Re: [time-nuts] Data Collection for Allan Deviation
In message <1925117252.232793.1438455428192.javamail.ya...@mail.yahoo.com>, Bob
Stewart writes:
>Hi Poul,
>"0) Make sure that the counter does not get its reference frequency
> from any of the input signals."
>
>Does your rule 0 hold if one of the input signals is a Cs standard?
>I
ob Stewart ; Discussion of precise time and frequency
measurement
Sent: Saturday, August 1, 2015 4:10 PM
Subject: Re: [time-nuts] Data Collection for Allan Deviation
In message <1925117252.232793.1438455428192.javamail.ya...@mail.yahoo.com>, Bob
Stewart writes:
>Hi Pou
to 100 tau is a bit
> noisy if I use the internal 10811 to clock the 5370A. I noticed the same on
> my 5335A.
> Bob
>
> From: Poul-Henning Kamp
> To: Discussion of precise time and frequency measurement
> ; zzsili...@post.com
> Sent: Saturday, August 1, 2015 4:19
Sent: Saturday, August 1, 2015 8:22 PM
Subject: Re: [time-nuts] Data Collection for Allan Deviation
Hi
Which approach are you using:
1) start with 1 pps, stop with 10 MHz (max period ~ 100 ns)
2) start with 1 pps stop with 1 pps (max period ~ 1 second)
Each has it’s own set of issues. A 1
enning Kamp
> To: Bob Stewart ; Discussion of precise time and frequency
> measurement
> Sent: Saturday, August 1, 2015 4:10 PM
> Subject: Re: [time-nuts] Data Collection for Allan Deviation
>
>
> In message <1925117252.232793.1438455428192.javamail.ya...@mail.
In message <1502052008.304624.1438465781711.javamail.ya...@mail.yahoo.com>, Bob
Stewart writes:
>Here's an example of what I'm talking about. See description and
>notes. The blue trace is the one using the clock in the 5370A.
>The other tests match pretty closely down to around 60s or
eball” range, they aren’t terribly complex to set up.
Bob
>
> Bob
> From: Bob Camp
> To: Bob Stewart ; Discussion of precise time and frequency
> measurement
> Sent: Saturday, August 1, 2015 8:22 PM
> Subject: Re: [time-nuts] Data Collection for Allan Deviation
&g
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