Apparatus for producing an electrical output signal whose magnit

Details Apparatus for producing an electrical output signal whose magnit Apparatus for producing an electrical output signal whose magnit

1975-02-26

1976-08-31

Strecker, Gerard R.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 99D, 340347NT, G01R 2702

Patent

active

039784029

ABSTRACT:
In a DVOM of the dual slope type, an unknown resistance or conductance to be measured is connected to a reference signal source to generate a voltage or current which is measured by the DVOM. However, if the input impedance of the DVOM is not extremely high, it loads the unknown resistance or conductance, and renders the relationship between the value of the unknown resistance or conductance and the actual voltage or current measured by the DVOM non-linear. In order to correct for this, a proportion of this actual voltage or current is algebraically summed with the reference signal used in the DVOM for generating the second slope of its dual slope operation, the proportion being selected in dependence on the input impedance of the DVOM (which can thus now take any convenient value) to linearize the relationship between the value of the unknown resistance or conductance and the output signal of the DVOM.

REFERENCES:
patent: 3500384 (1970-03-01), Naydan et al.
patent: 3566265 (1971-02-01), Reid
patent: 3660834 (1972-05-01), Picot
patent: 3711850 (1973-01-01), Kelly
patent: 3849775 (1974-11-01), Buchanan et al.
patent: 3875503 (1975-04-01), Hayashi
patent: 3895376 (1975-07-01), Uchida
patent: 3896431 (1975-07-01), Dickinson

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