07, 2008 5:13 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Measuring 10 MHz accurately: correction
Bruce Griffiths wrote:
Martyn Smith wrote:
Hi,
Two questions for all of you today.
1st Question
I can measure 10 MHz frequency to an accuracy of about 2
Hi,
Two questions for all of you today.
1st Question
I can measure 10 MHz frequency to an accuracy of about 2 parts in 10E-12 in
a one second gate time.
I use a SR620 time interval counter and make a timeAB measurement.
I make two measurements of phase (between my UUT and my reference) and
-
Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Im Auftrag von Martyn Smith
Gesendet: Mittwoch, 7. Mai 2008 18:52
An: time-nuts@febo.com
Betreff: [time-nuts] Measuring 10 MHz accurately.
Hi,
Two questions for all of you today.
1st Question
I can measure 10 MHz frequency
At 10:20 AM 5/7/2008, Ulrich Bangert wrote:
Martyn,
2 parts in 10E-12 in a second's gate time would require to measure the
time interval with an 2 ps resolution. Since the SR620 (at least mine)
features a 20 ps single shot resolution, i fear your number is more
likely 20 parts in 10E-12. Or what
What is the difference between 1E-12, 10E-12, and 10^-12?
Ed, K1GGI
snip
2 parts in 10E-12
snip
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Ed, k1ggi wrote:
What is the difference between 1E-12, 10E-12, and 10^-12?
A little imprecision in the nomenclature, but it all should
mean the same thing.
1 part in 10E12 is the same as saying 1 part per 10E12. It is
the fraction:
1/[10E12], or 1.0 x 10E-12
...
snip
2 parts in 10E-12
Hi Martyn,
you may be able to use a Wavecrest DTS-2070 or better DTS-2075 Time Interval
Analyzer for this.
It has up to 40K samples/second capture capability, with +/-25ps single-shot
accuracy, 10ps RMS noise, and 800 Femtoseconds resolution.
If you can capture the data via GPIB, you
Ed wrote:
What is the difference between 1E-12, 10E-12, and 10^-12?
E means raised to the power of ten.
x E y is shorthand for X * 10^y.
(See http://en.wikipedia.org/wiki/E_notation#E_notation)
1E-12 and 10^-12 are the same number, specifically 1,000,000,000,000.
10E-12 is one order of
-
Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Im Auftrag von Martyn Smith
Gesendet: Mittwoch, 7. Mai 2008 18:52
An: time-nuts@febo.com
Betreff: [time-nuts] Measuring 10 MHz accurately.
Hi,
Two questions for all of you today.
1st Question
I can measure 10 MHz frequency to an accuracy of about
Bruce Griffiths wrote:
Martyn Smith wrote:
Hi,
Two questions for all of you today.
1st Question
I can measure 10 MHz frequency to an accuracy of about 2 parts in
10E-12 in a one second gate time.
I use a SR620 time interval counter and make a timeAB measurement.
I make two
Martyn Smith wrote:
Hi,
Two questions for all of you today.
1st Question
I can measure 10 MHz frequency to an accuracy of about 2 parts in 10E-12 in
a one second gate time.
I use a SR620 time interval counter and make a timeAB measurement.
I make two measurements of phase (between my
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