Hi, Edgardo -- Your counter's noise near t=1s will dominate most measurements you're likely to make, so there's nothing to be gained by acquiring data at even faster rates. This will probably be true out to at least 10-100 seconds or even longer, depending on what you're measuring.
For best ADEV fidelity you'd want to use TI measurements rather than frequency measurements, but frequency measurements are obviously much easier to set up. They can give you a good overall idea of what's going on. -- john Miles Design LLC > -----Original Message----- > From: 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 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.
