There is a potential problem, particularly with the 5370A and possibly 
the 5370B which may not be generally known.

1) Crosstalk between the microstriplines from the Schmidt trigger 
outputs (XA4: U1, U2) to the arming board amplifier inputs (XA22: U19, U20)

2) Cross talk between the microstriplines going from the multiplexers 
(XA22: U15, U16) to the START and STOP flipflops (XA22: U17, U21)

3) Modulation of the 200MHz reference at and by the mixer inputs (XA19, 
XA20:U7)

1 + 2 cause differential nonlinearity in instances where the signals are 
simultaneously active near the trigger points. Nonlinearity is well over 
100ps.
3 causes a nonlinearity of less than 100ps but is always present

Bruce


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