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 determine at which sample rate your noise floor is better than the predicted performance of the oscillator under test. You'll probably find that you are measurement-noise limited below several hundred seconds.
Also, you'll generally get a lower noise floor doing time interval rather than frequency measurements, so you might experiment with that, which normally involves using a low-rate signal such as PPS for "start" and "stop" channels. John On Nov 14, 2012, at 8:43 PM, Edgardo Molina <xe1...@amsat.org> wrote: > 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 are: > > a. What is the recommended sampling duration to consider for Quartz, Rubidium > and other types of oscillators? > b. What are the recommended sampling intervals for the above mentioned > oscillator types? > c. I am using a 10 MHz Rb FE-5806A frequency standard as an external > reference for the HP-53132A. > d. I am connecting my DUT at the frequency counter channel 1 > e. I am setting Timelab for Data Type = Frequency > f. My graphs somehow have the same geometry of classical ADEV examples, I can > differentiate the ADEV noise types quite easily. > g. Should I use sub-second sampling intervals for my graphs to start closer > to the vertical axis of the graph? Or should I use a conservative 1s sampling > rate? > > With the previous questions I am looking for consistency in my ADEV studies. > Are there any typical ADEV conditions to be considered when analysing this > way? > Am I missing something? My apologies to everybody if I am missing something > or doing it the wrong way. In the end I want to learn more than anything else. > > Your kind comments are welcome. Thank you. > > Best regards, > > > > Edgardo Molina > Dirección IPTEL > > www.iptel.net.mx > > T : 55 55 55202444 > M : 04455 10045822 > > Piensa en Bits SA de CV > > > > Información anexa: > > > > > CONFIDENCIALIDAD DE INFORMACION > > Este mensaje tiene carácter confidencial. Si usted no es el destinarario de > este mensaje, le suplicamos se lo notifique al remitente mediante un correo > electrónico y que borre el presente mensaje y sus anexos de su computadora > sin retener una copia de los mismos. Queda estrictamente prohibido copiar > este mensaje o hacer usode el para cualquier propósito o divulgar su en forma > parcial o total su contenido. Gracias. > > > NON-DISCLOSURE OF INFORMATION > > This email is strictly confidential and may also be privileged. If you are > not the intended recipient please immediately advise the sender by replying > to this e-mail and then deleting the message and its attachments from your > computer without keeping a copy. It is strictly forbidden to copy it or use > it for any purpose or disclose its contents to any third party. Thank you. > > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
