In a message dated 4/7/2007 15:16:30 Pacific Daylight Time, [EMAIL PROTECTED] writes:
Your theoretical resolution seems somewhat awry see: http://www.femto-st.fr/~rubiola/conference-articles/2005fcs%28rubiola%29-count ers.pdf Hi Bruce, My math is essentially their reference [4, p.26], and I did state that I don't know the exact interpolator, trigger, and frequency-dependent noise functions of the Wavecrest. DTS-2075 is superior to the SR-620 and 53132A in time interval measurement, especially for single-shot measurements (parameters from manufacturers data sheets): DTS-2075: +-25ps single shot accuracy, 3-sigma 800 femtoseconds resolution with 1 femtosecond LSB display SR-620: Relative errors: <±(50 ps typ. [100 ps max.] + Timebase Error × Interval) Absolute errors: <±(500 ps typ. [1 ns max.] + Timebase Error × Interval + Trigger Error) 25ps single shot resolution (31 times worse than DTS) 53132A: 150ps resolution, at 100ps uncertainty (RMS) (187 times worse resolution than DTS units) Ebay Prices for clean, working units: Wavecrest: units were sold for $350, $500, $900 in the last years SR-620: estimated $1000++ HP53132A: $1200 - $1600 Unfortunately no one has sent pointers yet on how to run the Visi software on Win2K :( bye, Said ************************************** See what's free at http://www.aol.com. _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts