[time-nuts] Looking for Wavecrest Visi
SAIDJACK at aol.com
SAIDJACK at aol.com
Sun Apr 8 06:22:33 EDT 2007
In a message dated 4/7/2007 15:16:30 Pacific Daylight Time,
bruce.griffiths at xtra.co.nz 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
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