Methods of eliminating conversion factor drift effects in a clip

Details Methods of eliminating conversion factor drift effects in a clip Methods of eliminating conversion factor drift effects in a clip

1978-07-27

1980-11-18

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324127, 324251, G01R 3300

Patent

active

042348463

ABSTRACT:
A clip-on ammeter includes a magnetic frame, which is designed as a clamp and accommodates a winding and a Hall element in an air gap, a reference current source and a commutating switch for connecting the current source to the winding. Methods of operating include taking measurements with reference current flowing in each of the two possible directions in the winding and secondly with reference current flowing to oppose the effect of the current under measurement and with no reference current flowing. The conversion factor is calculated for use in obtaining readings free of conversion factor drift.

REFERENCES:
patent: 3050698 (1962-08-01), Brass
patent: 4059798 (1977-11-01), Dierker et al.

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