Section 4
4-10
used to measure resistance ratios at a power level of 10 mW, we see that I
bias
10
-8
I
test
so that
the DC loading of the nanovolt detector is negligible.
(Note that in the 6675A we have no fractional or subfractional turns to deal with and
the attendant calibration problems associated with fractional turns, however the
nanovoltmeter has to be linear to 14 bits on all 5 ranges).
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