Bob, FYI - we have often had to "tune" our drop drives (both standard and 'High Speed') by also adding/changing the impedence (resistors) from the drive output to the sort head. If the device gets over driven it seems the satellite droplet formation goes up in a nonlinear manner. The most stable and clean drop formation is with a higher drive level out, but with a good resistor or two in line. Since we're talking about different instruments, the actual values in use probably won't help much, but I thought it worth mentioning. Regards, Joe
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