Its actually Tau with a subscript 0.
This is the the time interval between successive measurements.
e.g. if a measurement is taken every second then Tau0 is 1 sec.
Bruce
Edgardo Molina wrote:
Dear John Ackermann,
I find your reply to my request to be very interesting. Without fear of asking.
Hi Edgardo --
Sorry, I should have explained. Tau0 is shorthand for the base tau -- the
actual interval between each measurement. You can measure longer tau by simply
using every nth measurement. So tau0 = 1 second simply means you're taking a
reading once per second.
John
On Nov 20,
Dear John Miles, John Ackermann, Adrian, Tom and Bob,
Thank you all for your wisdom on this topic. I have enjoyed the weekend getting
graphs from my frequency standards taking care of your advise and comments. I
will soon be able to post them to my newborn web page. Details coming soon.
Dear John Ackermann,
I find your reply to my request to be very interesting. Without fear of asking.
May I know how do I achieve a Tau 0 measurement in a 1 second interval with my
setup? (HP-53132A + TimeLab).
Please tell me if I am wrong. I assume I would take the 10 MHz output from the
Adrian,
On 15/11/12 03:59, Adrian wrote:
Hi Edgardo,
however, the 53132A is considerably more sensitive in frequency mode as
we have recently discovered.
I saw an astoundingly low ADEV noise floor of some 6E-13 at t=10 sec as
opposed to only 2.5E-11 in TI mode.
I don't have a 53132A, only a
Hi Magnus,
when I noticed the difference between frequency and time interval mode
on my 53131A, I compared some sources in both modes.
There was little difference between both modes where the signal was
above the TI mode noise floor.
Below that t-range (that is, below the point where in TI
: time-nuts-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of Edgardo Molina
Sent: Wednesday, November 14, 2012 5:44 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Recommended parameters for Timelab ADEV analysis
Dear Group,
Now that I have
Dear Group,
Now that I have setup TimeLab along with the Prologix GPIB to USB adapter and
the HP-53132A frecuency counter, I am starting to get some data from my
frequency standards. Still I think I have a long way to go in front of me.
One of the main concerns that cross my mind at this point
[mailto:time-nuts-
boun...@febo.com] On Behalf Of Edgardo Molina
Sent: Wednesday, November 14, 2012 5:44 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Recommended parameters for Timelab ADEV analysis
Dear Group,
Now that I have setup TimeLab along
Edgardo, the minimum sample rate in practice is determined by the noise floor
of the measurement system. I would suggest that you do a baseline test by
measuring the counter reference against itself with a tau0 (sample rate) of 1
second. You'll see a best-case result and from it you can
...@febo.com] On Behalf Of Edgardo Molina
Sent: Wednesday, November 14, 2012 5:44 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Recommended parameters for Timelab ADEV analysis
Dear Group,
Now that I have setup TimeLab along with the Prologix GPIB to USB adapter
Hi Edgardo,
however, the 53132A is considerably more sensitive in frequency mode as
we have recently discovered.
I saw an astoundingly low ADEV noise floor of some 6E-13 at t=10 sec as
opposed to only 2.5E-11 in TI mode.
I don't have a 53132A, only a 53131A that I don't use anymore for
12 matches
Mail list logo
