Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Balancing
Patent
1979-12-20
1983-04-05
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Balancing
324111, 340347NT, 340347AD, G01R 1706, H03K 1320
Patent
active
043792600
ABSTRACT:
A dual-slope integrator is provided in the usual manner with input switches for a measured voltage and reference voltage and with a first counter having a count capacitor N.sub.1, in addition to the usual integrating resistor and integrator condenser in circuit with an integrating amplifier. The output of the latter is applied to a comparator and a clock-pulse generator produces the counting pulses. According to the invention, a second counter is provided with a capacitor N.sub.2 so that the two counters together have a capacity N.sub.1 .times.N.sub.2, the input switching circuit is keyed by the clock pulses, and a further amplifier of amplification N*.sub.2 is provided, the amplification factor N*.sub.2 being approximately equal to N.sub.2. The latter amplifier is connected to a holding condenser through a further switch which is triggered in the cadence of the clock pulses to eliminate instabilities resulting from temperature dependent and transient factors in the otherwise conventional dual-slope integrator.
REFERENCES:
patent: 3840807 (1974-10-01), Zschimmer
patent: 3895376 (1975-07-01), Uchida
patent: 4082998 (1978-04-01), Marriott
Walton, C. A.; "Triple Ramp . . . " IBM Tech. Dis. Bull.; vol. 11; No. 4; Sep. 1968; p. 384.
Karlsen Ernest F.
Kernforschungsanlage Julich GmbH
Ross Karl F.
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