Hello Bob: That's good idea, I will try it at right time, in fact I collect about 300 data by measured a OCXO warm-up, and I made a excel chart to analize the relative of output digit and frequency. but it's very crudely because I use little time to do it. I don't have a high resolution DAC, I will find a way to do this test late. Thank you.
Here is a screen shot of my chart: http://hkbbs.leowood.net:88/incomefiles/20139/18581578616.JPG Hui Zhang At 2013-09-01 07:51:24,"Bob Camp" <[email protected]> wrote: >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. _______________________________________________ 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.
