Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With amplifier or space discharge device
Patent
1975-06-23
1977-08-16
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With amplifier or space discharge device
324 725, 324115, G01R 130, G01R 1508, G01R 106
Patent
active
040428818
ABSTRACT:
An electrical quantity measuring device is disclosed that includes a probe unit presenting high impedance, which device is suitable for measuring voltage. The components of the measuring device, except for the probe unit, are housed in a cabinet having a meter mounted thereon for external viewing. The probe unit has a contactor and provides an output signal indicative of the predetermined quantity of an element to be measured during contact of the element with the contactor and a ground lead. A high impedance between the contactor and the probe output is provided by a plurality of field effect transistors, and an operational amplifier, the gate of the first of which transistors is connected with the contactor and the gate of the second of which receives a feedback signal from the processing circuitry of the measuring device within the cabinet. A third field effect transistor is connected with the first field effect transistor and compensates for leakage current. The processing circuitry of the measuring device includes a pair of series connected transistors with the junction at the output side of the transistors providing an output signal suitable for scope usage and also providing the feedback signal to the high impedance section of the probe unit. The output from the processing circuitry is also coupled through range selection switching circuitry and driving circuitry to a meter as well as to indicating circuitry for indicating the polarity of a reading on the meter.
REFERENCES:
patent: 3502981 (1970-03-01), Teer et al.
patent: 3828256 (1974-08-01), Liu
Osipov, A. K.; Semiconductor Electrometric Amplifiers; Instru. Exp. Tech. (U.S.A.); Jan.-Feb., 1971; pp. 1-11.
Bohr, E.; "A No-Load Signal Probe;" Radio and Television News; June 1956; pp. 68, 69, 154, 155.
Karlsen Ernest F.
Rolinec Rudolph V.
Unitec, Inc.
LandOfFree
Voltage measuring device having an amplifier in the probe does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Voltage measuring device having an amplifier in the probe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Voltage measuring device having an amplifier in the probe will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-363643