Terminal resistance (decade) -9, E 3-7 – KEPCO BOP-HV User Manual

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BOPHV112211

3-9

Since Eref is either (+) or (–) 10 volts (depending on the position of S1) and the gain ratio
Rf/Ri is variable from zero to one, the output voltage (E

PRE-AMP) will be inverted and

vary linearly (from (–) 10 volts, through zero, to (+)10 volts) with the change in the decade
resistance (Rf). As a consequence, the BOP output voltage will also vary linearly with the
change in decade resistance. Inversion provided by the final output stage means that the
BOP output voltage will be the same polarity as Eref.

FIGURE 3-7. REMOTE POTENTIOMETER CONTROL OF THE BOP D-C OUTPUT VOLTAGE

FIGURE 3-8. REMOTE D-C OUTPUT VOLTAGE CONTROL BY MEANS OF A TWO

TERMINAL RESISTANCE (DECADE)