Reference Voltage Range Divider

TM 11-6625 -537-14-1

string. Between the two wipers of S6 then, there

VDC ADJ R329 adjust the output level for the 50,

is a total resistance of 40K (80K paralleled by

5, and 0.5-volt ranges, respectively, In the ac

80 K). If 500 volts is applied to the precision

mode of operation, levels G and H of AC-de

voltage divider, a total of 100 volts will then

polarity switch S5 bypass RANGE switch S2 and

appear across the wipers of S6, 10 volts across the

fix the output of the reference voltage range

wipers of S7, 1.0 volt across the wipers of S8, O..

divider at 5 volts.

volt across the wipers of S9, and 0.01 volt across

d. Precision Vo/tage Divider (fig. 5-5). The

each resistor selected by S1O. The wirewound

precision voltage divider divides the output of the

resistors comprising the precision voltage divider

reference voltage range divider (500, 50, 5, or 0.5

are matched to provide an overall divider ac-

volts) into 500 equal increments. The precision

curacy of 0.01 percent. A filter consisting of R331

voltage divider consists of five Kelvin -Varley

and C301 or C302 is connected across the output

decade resistor strings, R401 through R449, and

of the precision voltage divider by level D of

switches S6 through S1O. The position of

RANG E switch S2 to eliminate any electrical

switches S6 through S 10 is indicated by voltage

noise introduced by the wirewound resistors in

readout dials A through E, respectively, on the

front panel. The strings connected to S7, S8, S9,

t h e precision voltage d i v i d e r and reference

and S 10 parallel two resistors of the preceding

voltage range divider,

5-8