Range selector switch for ion chamber instrument

Details Range selector switch for ion chamber instrument Range selector switch for ion chamber instrument

1988-01-28

1990-12-11

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

324123C, 307254, G01R 130

Patent

active

049773674

ABSTRACT:
An ion chamber type instrument for measuring radioactivity includes a high gain operational amplifier having a feedback network of range determining resistors connected between the amplifier output and input. Electronic switches in series with at least some of the range determining resistors function as range selector switches for the measuring instrument. Each switch includes two series-connected transistors and a third transistor, the interconnection point between the two series-connected transistors being connected to the electrical neutral point of a measuring circuit via the third transistor. Each switch, when in an "off" or non-conducting condition, provides a high effective resistance of, for example, 1.times.10.sup.15 ohms so as to minimize errors caused by leakage current fed back into the input of the high gain operational amplifier.

REFERENCES:
patent: 3609542 (1971-09-01), Burke
patent: 3725661 (1973-04-01), Gripentog
patent: 3758858 (1973-09-01), McCue
patent: 3778710 (1973-12-01), Snook
patent: 4137428 (1979-01-01), Federico et al.
patent: 4222270 (1980-09-01), Allen
patent: 4617680 (1980-10-01), Johnston
Muzii et al., Low Frequency Capacitance Measurements, 10/02/75, pp. 487-489, Electronics Letters, vol. 11, No. 2.

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