TB 9-4931-290-24
NOTE
R46 1 & 10 mV ac (fig. 1 or 2) affects the 1 mV range as well as
the 10 mV range and should be adjusted for best overall
indication on both ranges.
Figure 1. Model 421A (above S/N 901) adjustments.
Figure 2. Model 421A (below S/N 901) adjustments.
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