Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Measuring or testing
Patent
1985-03-11
1986-12-30
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Measuring or testing
377 25, 73295, 340620, G01F 2324
Patent
active
046334912
ABSTRACT:
In a circuit for electrothermal measurement of level compensated for ambient temperature which has a switched source of constant current (2) for a resistance probe (1), a first variable formed from an initial voltage U.sub.0 on the resistance probe at the start of a heating period is compared by a comparator (14) with a second variable formed from a heating voltage U.sub.1 at the end of a heating period. One of these two variables, in this case the first variable, is formed in accordance with a time integral and used as basis for the comparison with the other variable. For the formation of the integral, a resistor (10) and a capacitor (9) are components of an integrator whose input can be coupled to the resistance probe (1) via a first sample and hold member (4, 5) for the initial voltage U.sub.0. The output of the integrator is connected to a first input (13) of a comparator (14). The second input (15) of the comparator can be connected via a second sample and hold member (6, 7) directly to a resistance probe (1), i.e. not via an inverter for the heating voltage U.sub.1. A presettable backward counter (17) is connected to the output of the comparator in order to determine the time between the actuation of the second sample and hold member and the switching of the comparator.
REFERENCES:
patent: 4053874 (1977-10-01), Glaser
patent: 4079315 (1978-03-01), Mohr
patent: 4163391 (1979-08-01), Bezard et al.
patent: 4397031 (1983-08-01), Weber
patent: 4558456 (1985-12-01), Bezard et al.
Farber Martin A.
Heyman John S.
VDO Adolf Schindling AG
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