Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With amplifier or space discharge device
Patent
1977-04-29
1978-07-25
Mullins, James B.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With amplifier or space discharge device
330203, 330297, G01R 130
Patent
active
041032314
ABSTRACT:
An electrometric apparatus, which uses a measuring device that provides a high impedance dc signal which varies in accordance with the variable to be measured. The dc signal is amplified by at least one amplifier means and the amplified signal is applied to an indicating means which indicates the amplitude of the amplified dc signal. The supply voltage for the amplifier means is provided by a dc power supply means connected through a regulating means to positive and negative supply busses and for the amplifier means. The regulating means includes a transistor having its emitter-collector circuit connected in series between the power supply means and the positive supply bus of the amplifier means. A resistor and a Zener diode are connected in series and the series combination is shunt connected between the supply busses. A pair of series connected resistors are shunt connected between the supply busses. A programmable operational amplifier has one input connected to the junction between the resistor and the Zener diode and the other input connected to the junction between the series connected resistors. The output of the programmable operational amplifier is connected to the base of the transistor.
REFERENCES:
patent: 3252086 (1966-05-01), Lundstrom
Garment et al., "Low Cost Electrometer for Current Range 10.sup.-11 -10.sup.-5 A," Journal of Physics E: Scientific Instruments, 1971, vol. 4, pp. 707-708.
Messina, "Power Supply Regulator Uses Fewer Parts," Electronics, Jan. 6, 1969, p. 54.
Cole-Parmer Instrument Company
Mullins James B.
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