[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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