Hi One thing to look at -
Take a large set of data and then sort it by reading. What you will find is that there are only certain numbers that come up. You can directly observe this with a good OCXO and a high resolution input to the EFC. Bob On Aug 31, 2013, at 11:06 AM, Hui Zhang <[email protected]> wrote: > Dear group: > > I found a strange thing about HP53132A’s output digit, I know the HP53132A > is a universal counter that have 12 digits per second performance by read the > manual. By use 10s gate time, I thought it will be 13 digits resolution. But > I found it can output more digits reads by use GPIB or RS-232 way to collect > datas. (This is simple way rather than use offset method). I use RS-232 cable > to connected to my counter to observe the frequency of a OCXO, I got these > output result ( a part of long sequence): > > 9.999,967,286,098,0 MHz > 9.999,981,814,726,9 MHz > 9.999,991,573,702,0 MHz > 9.999,997,482,253,0 MHz > 9.999,999,945,685 MHz > 10.000,000,472,030,4 MHz > 10.000,000,460,991,3 MHz > 10.000,000,352,570,9 MHz > 10.000,000,254,108 MHz > 10.000,000,183,759 MHz > 10.000,000,136,842 MHz > .. > . (Omitted few lines) > . > 10.000,000,039,724 MHz > 10.000,000,006,299 MHz > 9.999,999,992,692 MHz > 9.999,999,990,674 MHz > 9.999,999,989,094 MHz > 9.999,999,995,662 MHz > 9.999,999,993,829 MHz > > The question is in first four lines the reads is 14 digits, but in line 5, > the digits reduce to 13 digits, and then, it’s became 15 digits in line > 6(because over 10Mhz). After 3 lines, the reads reduce one digits again to > became 14 digits(also over 10Mhz), again after that few lines the frequency > less that 10Mhz, it return to 13 digits like last few line. My question is > what determines the HP53132A’s resolution? Why the output is variable digits > even the had very close frequency? Any comment will be appreciate. > > > > Hui Zhang > _______________________________________________ > 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.
