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 53132A and plug it into the Channel 1 input, while the external reference of 10 MHz is disconnected. As far as I am concerned, TimeLab does not allow a value of 0 for Tau. If I enter zero as the measurement time duration I get an error and actual acceptable Tau range. The smaller value is in the order of 1E-6s. Am I getting it right? I am sorry for my confusion. 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. On Nov 14, 2012, at 8:13 PM, John Ackermann N8UR <[email protected]> wrote: > 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 <[email protected]> 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 -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
