Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Calibration
Patent
1990-08-31
1992-06-09
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Calibration
324724, 324706, 324721, 374173, G01R 2702
Patent
active
051210649
ABSTRACT:
A system and method for calibrating a transducer having a bridge-type network. The calibration includes a source of constant current and a calibration circuit including the source connected across one of the resistive-type transducer elements of the bridge. Switching means are provided in the calibration circuit so that the current can be selectively supplied to or withheld from the resistive-type transducer element across which the calibration circuit means is connected for producing a calibration signal. The calibration signal is substantially independent of the transducer output regardless of whether or not the signal is temperature compensated and whether it is switched mechanically, electromechanically, or electrically. An internal calibration resistor in the current source is used to make the current inversally proportional to the bridge arm resistance. The calibration resistor tracks the resistive-type transducer elements of the bridge over temprature. The calibration resistor is chosen to have almost any convenient value and it need not be trimmed. The change in output voltage produced by switching in the calibration current is independent of temperature provided the calibration resistor accurately tracks the bridge resistors. Furthermore, the output voltage is substantially constant even when the bridge is significantly unbalanced.
REFERENCES:
patent: 3130578 (1964-04-01), Ames, Jr.
patent: 3439258 (1969-04-01), Van Leewen
patent: 3605008 (1971-09-01), Shoemaker
patent: 3841150 (1974-10-01), Pearson
patent: 3943434 (1976-03-01), Haeusler
patent: 4057755 (1977-11-01), Piesche
patent: 4081744 (1978-03-01), Ray
patent: 4174639 (1979-11-01), Raven
patent: 4190804 (1980-02-01), Pyne et al.
patent: 4298969 (1981-11-01), Rickenbacker
patent: 4299130 (1981-11-01), Koneval
patent: 4414853 (1983-11-01), Bryzek
patent: 4651033 (1987-03-01), Yasutake
patent: 4658651 (1987-04-01), Le
patent: 4715003 (1987-12-01), Keller et al.
patent: 4841229 (1989-06-01), Eccleston
Allied-Signal Inc.
Miller Terry L.
Solis Jose M.
Walsh Robert A.
Wieder Kenneth A.
LandOfFree
Method and apparatus for calibrating resistance bridge-type tran does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for calibrating resistance bridge-type tran, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for calibrating resistance bridge-type tran will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1807181