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4. Verification and calibration
4.1 Self-calibrating resistive dividers (DC)
In this case, the problem is limited to comparing very similar resistances (differing by 10 –4 or less in relative value). We use a bridgehead (proportioning arm) with very fine adjustment in the vicinity of the unit ratio. Figure 19 shows how this bridgehead is assembled, using two closely-spaced resistors P and Q and a potentiometer (R, aR ) shunted to a shunt S.
Swapping the two resistors to be compared, A and X, leads to two equilibria:
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Verification and calibration
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Resistive dividers
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