Am 09.08.2010 14:15, schrieb Loïc MOREAU: > 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 >
Hi Loïc, it is easy if you could get a Trimble Tunderbolt with a GPS-antenna. Connect the 10 MHz out of TB to the ext. 10 MHz input of your 53132A and you will have a precise reading close to 1 E-11. After getting the counter stable running some days or a week you may then calibrate the internal ocxo comparing both oscillators. One source for a TB was TAPR. Mine does pull just about 7 W, about a third of a RbO. If you are lucky you may find a PRS10 RbO for a reasonable price, but it does need as well beeing calibrated from time to time and will be more expensive overall. Bonne chance, Arnold _______________________________________________ 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.