METHOD OF AND CIRCUITRY FOR SETTING DC SIGNAL CONDITION IN ELECTRIC MEASURED SYSTEM MEASURED VALUE TRANSMITTER* PARTICULARLY ELECTRICAL PRECISION MICROBALANCE

摘要

1507434 Voltage measuring SARTORIUSWERKE GmbH 9 Aug 1976 [22 Aug 1975] 33078/76 Heading G1U Interferring alternating voltages on a direct voltage to be measured, for example the voltage produced by an electrical weighing instrument, are removed by capacitively C1, Fig. 1, detecting the A.C., amplifying 4 and inverting the detected A.C., and capacitively C2 coupling the inverted A.C. back into the line to cancel the original interferring A.C. By this arrangement, the line is lightly loaded and no D.C. drift occurs. The preferred circuit is shown in Fig. 2, and the overall effect is as though a point on the main signal line from 2 to 3 were connected to earth via a high pass filter C1, 5, C2.