362results about "Ac/dc potentiometric measuring arrangements" patented technology

A method and system for calibrating an analog sensor used in a digital measurement system is provided. The design comprises generating a precise pressure value set at multiple calibration points and supplying said precise pressure value set to an uncalibrated pressure sensor, detecting sensor changes for the uncalibrated pressure sensor based on each precise pressure value generated, polling an actual pressure reading associated with a sensor change for the uncalibrated pressure sensor for each calibration point, and establishing a mathematical relationship between measured value readings and actual pressure for the uncalibrated sensor. Establishing the mathematical relationship converts the uncalibrated sensor to a newly calibrated sensor. A known good sensor may be employed to enhance calibration reliability.

The present invention discloses a method of using of a programmable circuit to calibrate a transducer. The programmable circuit is coupled to or communicates with a computer and to a testing station. The computer automatically varies the conditions of the testing station and programs the programmable circuit to produce a desired response. In another embodiment, a system is presented that can be used to measure various parameters that includes a programmable that may be mounted in the same package as a sensor. Such a system may include pressure sensors that are optimized to measure very low pressures.

A method of calibrating a metabolic analyzer incorporating an oxygen analyzer and a NDIR carbon dioxide analyzer in the field that does not require the use of gas cylinders containing gases of known concentration is described. In calibrating the CO₂ detector, at the time of factory setup, the detector output for a gas of a known concentration is measured and stored in the memory of the metabolic analyzer's microprocessor, as is the detector output voltage when the IR source is dimmed by a known percentage. Subsequently, in the field, CO₂ levels in ambient air and cell pressure are measured at two different flow rates through the sample chamber and the IR source is again dimmed by the same percentage as had been used at the time of factory setup. Based upon the resulting readings, both the zeroing and span adjustment factors can be computed.

The portable potential difference meter for high resolution measurement of DC voltage consists of work loop, standard loop and measurement loop. Its measurement loop has three measurement discs connected directly with wires, and no switch contact resistance and its variation. The measurement circuit has no influence of thermal potential, so that the portable potential difference meter has resolution as high as 0.1 microvolt.

An engine exhaust emission control device determines a differential pressure across a diesel particulate filter (DPF) to enable regeneration of the DPF at optimal timing. An ECU estimates the temperature of a differential pressure sensor provided for the DPF from the output of an intake air temperature sensor when the engine is not running, and determines an offset correction factor for correcting the sensor's offset error. The factor is set using the sensor output at this time as sensor's offset error, and stored in a memory. When detecting the differential pressure across the DPF, the temperature of the sensor at this time is estimated, and an offset correction factor that corresponds to this estimated temperature is selected. The sensor outputs are adjusted with this offset correction factor.

The device is constructed to position a measuring sensor, especially a sensor head at an angle to a sensor shaft, precisely at the point of measurement and in the direction of a fluid flowing in a test tube, in which there is an adjuster through which the measuring sensor, in a coaxial arrangement, can be adjusted via a first adjusting motor about its axis and/or by a second adjusting motor along its axis. A control device communicates with an electronic computer for controlling the sensor adjustment. An adjuster (4) is coupled to the sensor to rotate in unison therewith and has a rotatable pendulum which, in the position of rest transversely to the test tube axis defines the zero position of the sensor. Limit positions of the pendulum are predetermined from a relative movement of the adjuster about the axis which can be photometrically converted into position signals. The computer mathematically halves the angular adjustment calculated from the position signals received and sets the adjuster with the sensor to mechanical zero by the respective positioning stop command signals.

A two-range DC potential difference meter is composed of two ranges and four measuring plates of 20*8 omega, 10*0.88 omega, 9*1.76omega.and 10*0.176 omega .It features that all measuring resistances are directly connected by wires to exclude variation and contact resistance of measuring-stepping switch from measuring result and range conversion resistance value is integer power of one digit being multiplied by ten.

A resolver output correction device receives sine output signal and cosine output signal from a resolver. Each of the sine output signal and the cosine output signal has an offset error and a gain differential error due to a secular variation. The correction device detects maximal and minimal values with respect to both the sine output signal and the cosine output signal. It calculates average values between the maximal values and the minimal values. Then, it corrects the offsets of the signals based on the average values. It also calculates gain differentials between the maximal value and the minimal value with respect to both the sine and cosine signals. Then, it corrects the gain differentials of the signals based on the calculated gain differentials. As a result, both the offset and gain errors of the signals are corrected with accuracy.

The process of invention provides a simplified conversion of sulfur dioxide gas into hydrogen sulfide gas. First, sulfur dioxide gas is absorbed into an aqueous sulfide solution to form sulfite and bisulfide ions. Second, additional sulfur dioxide gas is absorbed into the aqueous solution to form hydrogen sulfide. Third, another portion of the sulfur dioxide is absorbed and reacts in the aqueous solution to form bisulfite. Most advantageously, the bisulfite is decomposed into sulfur dioxide and sulfite. The sulfite is then reduced to sulfide and returned for use in the absorption process. The hydrogen sulfide may then be reacted with SO2 via the Claus reaction to form elemental sulfur.

A driving device, includes a stepping motor having an exciting coil and a rotor; a driven member driven in accordance with a rotation of the rotor; a stopper mechanically stopping the driven member at a zero position; a controller controlling the state of excitation of the exciting coil; an induced voltage detector detecting an induced voltage generated by a change of magnetic flux according to the rotation of the rotor; and a zero position detector detecting a stoppage of the driven member at the zero position. The controller supplies an exciting pattern to the exciting coil at the time of processing of zero position detection. The exciting pattern includes a first exciting step for detecting the induced voltage and a second exciting step for rotation. Total periods of the first exciting step is greater than that of the second exciting step during an electrical angle 90° in the one cycle.

The present invention relates to a potentiometer, which is used for measuring the DC voltage and adopts the slip-line disc. The potentiometer consists of three stepping discs and a double-slip-line disc; the four discs all consist of a measuring disc and a replacing disc, which have the same resistance value; the working current is divided into two branches of 10 to 1 between two electrical brushes of the first stepping disc; two branches of the same current are formed in the branch with two parallel discs; the electrical brushes of the other measuring discs except the first stepping disc are connected with the electrical disc of the replacing disc through resistances or wires; each stepping disc or the double-slip-line disc has no auxiliary disc; therefore, the volume of the device is reduced, the manufacturing cost of the device is reduced, simultaneously the four measuring discs are connected through wires, and the influence of the variation and the thermoemf is eliminated.

An apparatus including: an optical sensor comprising an optical transmitter and an optical receiver; and a calibration system configured to change calibration of the sensor when a measurement taken at the optical receiver, while the optical transmitter is on and the apparatus is in use, passes a test.

The invention relates to a two-measuring-range potential difference meter with four metering panels, which is used for measuring direct-current voltage; four metering panels are directly connected by lead wires without a switch for switching, therefore, no contact resistance variation effect of the switch exists when the potential difference meter is used for measuring; the resistance value of the metering panel of each step panel and a substitution panel is 10 integer power, and the resistance can be compared with standard resistance by an electrical bridge, so as to improve the resistance manufacturing precision and improve the measuring accuracy of the whole potential difference meter.

A two-range switching potential difference meter with four measuring discs and applying distributary branch is composed of two ranges and four measuring discs as 20x 5 omega, 10x 0.55 omega, 9x 1.1 o mega and 10x 0.11 omega. It features that all measuring resistance are directly connected by conducting wire to exclude contact resistance and variation from measuring-stepping switch out of measuring result and integer power of one digit number multiplying by ten is used as value of resistance being used for range changeover.

The portable potential difference meter for the measurement of DC voltage consists of work current regulating resistor, setting resistor and measuring resistor. The setting resistor has resistance of 50 ohms and work current of 5.5 mA. One meter with pointer is used to indicate whether the voltage on the setting resistor is equal to the reference voltage of 275 mV, and voltage difference is amplified in the operation amplifier. The work current regulating resistor is used to regulate the work current to 5.5 mA. The instrument has three measurement ranges and maximum measured voltage of 2.3 V.

A three¿C range potential difference meter with four measuring discs and applying conversion branch is composed of four measuring discs as 20x 10 omega, 10x 1.1 omega, 9x 2.2 omega and 10x 0.22 omega. It is featured as connecting all measuring resistances directly by conducting wire to exclude contact resistance and variation of measuring ¿C stepping switch out of measuring result, using integer power of one digit number or two digit number multiplying by ten as value of resistance used on range switch ¿C over.