Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1986-02-14
1987-02-17
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324DIG1, G01R 2702
Patent
active
046442626
ABSTRACT:
An electrical bridge circuit arrangement for multi-position measuring includes an auxiliary or standard resistance half bridge and measuring resistances (M.sub.1, M.sub.2, M.sub.3) arranged in respective bridge arm circuits. An auxiliary or standard resistance (E) common to all measuring resistances is part of the bridge circuit. The measuring resistances (M.sub.1, M.sub.2, M.sub.3) and the auxiliary resistance (E) can be connected to a supply voltage by means of supply voltage switches (S.sub.12, S.sub.22, S.sub.32 ; S.sub.E3). The voltages present at the ends of the supply voltage diagonal of the bridge circuit are tapped by conductors (L'.sub.12, L'.sub.22, L'.sub.32 ; L'.sub.E3) and are supplied to the inputs of operational amplifiers (1, 2) which adjust or control the voltage level at the tapping point to a reference level. Voltage drops across the measuring diagonal are tapped by additional conductors (L.sub.31, L.sub.21, L.sub.11 ; L.sub.E1) and half of each voltage drop is superimposed on the supply voltage of the measuring arm while the other half is superimposed on the compensating or standard arm of the bridge with respect to the tapping of the compensating half bridge. Therefore, any voltage drops across the measuring diagonal cannot affect the measurement results in spite of long cables to the measuring resistances and in spite of the auxiliary or standard resistance (E) arranged in the measuring bridge circuit arrangement.
REFERENCES:
patent: 3048776 (1962-08-01), Logan
patent: 3443222 (1969-05-01), Mildwater
patent: 3873917 (1975-03-01), Kreuzer
patent: 4528499 (1985-07-01), Traub
Eisenzopf Reinhard J.
Fasse W. G.
Hottinger Baldwin Measurements Inc.
Kane, Jr. D. H.
Solis Jose M.
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