Apparatus for measuring low currents with high dynamics

Details Apparatus for measuring low currents with high dynamics Apparatus for measuring low currents with high dynamics

1985-01-24

1987-09-08

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With amplifier or space discharge device

324115, 324132, 340662, G01R 1508

Patent

active

046926933

ABSTRACT:
An apparatus for measuring low currents with high dynamics, comprising in series: a multi-range preamplifier, a logarithmic amplifier, a thresholding circuit, an alarm circuit and a reading circuit, the preamplifier comprising in series: a first differential amplifier receiving at its inverting input the low current to be measured and a second amplifier, the first amplifier having a linear feedback chain of very high impedance and the second amplifier having a linear feedback chain of much lower impedence, a zero point adjustment and a circuit for testing the gain of the apparatus being also provided on the first amplifier.

REFERENCES:
patent: 3483475 (1969-12-01), Mitchell
patent: 3562552 (1971-02-01), Baudino et al.
patent: 3714622 (1973-01-01), Wilhelmsen
patent: 4006410 (1977-02-01), Roberts
patent: 4136314 (1979-01-01), Blackmer et al.
patent: 4255706 (1981-03-01), Soojian
patent: 4558310 (1985-12-01), McAllise
"Auto-Ranging Voltmeter", by Roberts, Practical Electronics, 2/78, vol. 14, #6, 324-115, pp. 400-406.
Electronique Industrielle (No. 133, May 1970).
Instruments & Experimental Techniques (No. 1/2, Jan./Feb. 1977).
Technisches Messen, (No. 4, Apr. 1982).
IBM Technical Disclosure Bulletin (No. 8, Jan. 1983).

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