Hello Randy,
I have replaced the CAL-nvRAM by a DS1220AD-150 in 2013, as the Y
version was not available.
The speed was not the problem, but a slightly different supply volatge
range, if I remeber correctly.
My 3458A works w/o any problem, as does the instruments of 'quarks', who
got the 2nd nvRAM which I have ordered.
Frank
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