Hi If you have been reading here for a while, you know that I would recommend a Thunderbolt to just about anybody. They are cheap (for what they are) and easy to find. My first suggestion would be a TBolt.
Here's another approach: Do you really need accuracy, or is stability good enough? If stability is good enough, how stable for how long? A double oven crystal oscillator, kept on power could give you 0.1 ppb / day stability and < 1 ppb / month. An LPRO rubidium would do about the same day to day, but would get you to 0.01 ppb / month. Either one of them could be calibrated by a short battery powered visit to a friend who is running a TBolt or something similar. That would likely allow accuracy of < 1 ppb with either device. The LPRO would hold the accuracy for year or more. The OCXO would hold it for a month or more. At the other extreme: If you want to do instantaneous accurate and stable readings to the floor of the 53132, then both approaches have some limits. The TBolt would have to be in a very stable temperature environment to get close to the level the counter is capable of. You would also need to tweak it's parameters a bit. Accuracy would (obviously) be the issue with the free running sources. At the Time Nuts extreme: You really need at least three if not five of every frequency standard known to man, all in perfect working order ..... It all depends on what you need. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Loïc MOREAU Sent: Monday, August 09, 2010 8:16 AM To: [email protected] Subject: [time-nuts] My old new 53132A just arrived Hi all, My first goal is to verify the frequency of my different RF sources : 4420B, some DDS, a N2PK VNA and ISOTEMP 134-10, the next step with the help of an Excel spread sheet to have some idea about their respective stability. Equipped with option 010, I would like to know how in which direction to go to calibrate my unit. The frequency of the internal time base is supposed to be stable but I have no way to know the exact frequency as the unit is an old one. So I suppose I have to calibrate the gear with an external source, for now I can suppose that my 53132A is accurate to 10-6 or +-1Hz, as it is so easy to turn the front panel adjusting screw, I am not sure about the actual precision. I can take two possible direction to improve my system with an external time base. 1. acquire a rubidium 10Mhz, put in in a box with a 24V power supply Or 2. acquire a 10Mhz GMS time unit or homebrew one with one of the numerous project that we can find. Can somebody give an advice : I have no clue to choose between the solutions, apart the power drain of the first one. Regards Loïc http://www.eai.fr _______________________________________________ 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.
