Abstract: A device and a method for aiding inflation for a vehicle involves obtaining access to vehicle tire pressure and temperature data, and utilizing an under-inflation detection module and an inflation condition testing module, thus making it possible to carry out a test for detecting a possible optimal inflation condition if the following criteria are met:—there is a non-critical under-inflation state for at least one of the vehicle tires;—the tires are not in an overheated state;—and the tire state is unchanged by sunlight. When the test module determines the optimal inflation condition, a signal is outputted. Such a method causes tire inflation to be carried out under favorable conditions actually corresponding to the reference value provided by the manufacturers.

Abstract: In some embodiments, a method of using feedforward to control a system component may include determining if a feedforward term exists in a feedforward table for a received operating set point. If a feedforward term does not exist, the system component may be incremented until the system is within a first acceptable tolerance of the desired set point. In some embodiments, a measure of steady state error may be determined and compared to a second acceptable tolerance. If within the acceptable tolerance, the corresponding feedforward term may be recorded in the feedforward table. In some embodiments, if the feedforward term exists for the operating set point, the system component may be controlled using controller output that corresponds to the feedforward term. When a change to the system is detected that is associated with possible changes to the feedforward values, new feedforward values may be generated for the feedforward table.

Abstract: System, methods, and apparatuses produce simulated human physiological waveforms such as electrocardiograph (ECG) and blood pressure signals where the microcontroller and/or digital-to-analog converters may be switched to a lower power-consuming state by programmable instructions and switched on in response to a programmable sleep timer.

Abstract: A fan control method performed by a computer having a processor and a fan includes predicting a load of the processor for a job to be executed by referring to a memory that stores information on the load of the processor according to a job type, determining fan rotation control according to a temperature of the processor under the load, and controlling the fan according to the determined fan rotation control.

Abstract: A correction method in which characteristic curves and/or correction values are produced, by way of which the drive current for one or more electrically activated hydraulic values operated in an analog fashion is measured during a pressure regulation in such a way that, during the operation of an anti-lock regulation, one or a respective characteristic curve is first prescribed and then the prescribed characteristic curve is corrected, particularly in a learning process, wherein, after a pressure build-up phase, the current pressure model value (Pmod) is compared to and/or analyzed using a model locking pressure level (Pmax).

Abstract: The invention describes a method for temperature compensation of measured pressure values in a tire pressure control system of a vehicle, which is equipped with wheels with pneumatic tires in which a pressure sensor arranged below the tire obtains the pressure values and a temperature sensor arranged below the tire obtains temperature values and the measured pressure values are referred to a predefined reference temperature, giving due consideration to the known proportionality between the pressure and the temperature at a volume of air in the tire which is assumed to be constant. The invention provides that an offset of the temperature supplied by the temperature sensor from the mean air temperature prevailing in the tire is estimated for the temperatures measured at any time in the tire, and the currently measured temperature values are corrected using the estimated temperature offset as a correction value.

Abstract: The present document describes a ready to use sensing device which is auto-configurable when turned on. The sensing device includes one or more sensors and a communication port. When turned on, the system automatically contacts a central server via the communication port and requests the address of a second server with which the sensing device is associated. Upon receipt of the address of the second server, the sensing device contacts the second server and requests its customized configuration settings. When received, the configuration settings are installed, and the sensing device starts to sample the output of the sensors and sends the samples to the second server for storage. The user may view the measurement data by accessing the second server through the internet. The minimum memory capacity required for operating the sensing device is very low, due to the fact that the samples are sent to the second server every time the samples are taken.

Abstract: Apparatus, systems, and fabrication methods are provided for sensing devices. An exemplary sensing device includes a first sensing arrangement to measure a first property and provide one or more measured values for the first property, a second sensing arrangement to measure a second property, a storage element coupled to the second sensing arrangement to maintain a stored value for the second property measured by the second sensing arrangement, and a control system coupled to the first sensing arrangement and the storage element to determine one or more calibrated measurement values for the first property using the one or more measured values for the first property from the first sensing arrangement and the stored value for the second property.

Abstract: Method of estimating the volume (Vtk) of a tank (1), comprising: a step of calculating the volume (Vtk) of the tank (1) by applying the law of conservation of enthalpy (H) of the gas, considering that the transfer of the checking stream of gas is adiabatic (Ttk(t1)=Ttk(t2) and Tsi(t1)=Tsi(t2)), expressing the enthalpy of the gas in the tank as a function only of the temperature Ttk(ti) of the gas and the pressure Ptk(ti) of the gas (Htk=function of (Ttk(ti); Ptk(ti)), using the perfect gas law or a Van der Waals equation of state expressing the volume of the tank Vtk(ti) (in cubic meters) only as a function of the known or previously estimated variables.

Abstract: The invention relates to a method and a system for determining a target variable to be measured in a mobile device. A first physical variable is measured with the aid of a first sensor and a second physical variable with the aid of a second sensor. The second physical variable is different to the first physical variable, or is measured using a different technique. The value of the target variable is calculated with the aid of the measurement of the first and second physical variables. An estimate for the target variable is determined with the aid of at least the measurement of the first physical variable. At least a first error estimate is determined, which depicts the accuracy of the measurement of the first physical variable. The estimate of the target variable is filtered using both the first error estimate and the measurement of the second physical variable.

Abstract: A measurement instrument having a processor, a first sensor and a second sensor. The processor is adapted to output a measurement signal embodying a measurement of a physical quantity. The first sensor and second sensor are connected to the processor and are operable to generate respectively first and second measurements of the physical quantity. The processor defines a first measurement range within which the measurement signal is dependent on the first measurement and not the second measurement. The processor defines a second measurement range within which the measurement signal is dependent on the second measurement and not the first measurement. The first and second ranges meet at a predetermined transition. The first and second measurements are different at the transition and the measurement embodied in the measurement signal crosses the transition without an abrupt change.

Abstract: An electronic control system includes a microcomputer and a signal processing circuit, and receives output signals of an in-cylinder pressure sensor and a crank angle sensor. The output signal of the pressure sensor indicates an output voltage of a piezoelectric transducer and a reference voltage. The signal processing circuit includes a hold circuit and a differential amplifier circuit. The differential amplifier circuit amplifies a difference between the output signal of the pressure sensor and the output signal of the hold circuit and outputs the result to the microcomputer. The hold circuit switches over the output signals in response to a switchover instruction of the microcomputer. When the switchover instruction is a set instruction, the hold circuit holds as its output signal the output signal of the pressure sensor outputted at the time of receiving the set instruction. The microcomputer outputs the set instruction to the hold circuit in response to the output signal of the crank angle sensor.

Abstract: In an electronic device and a method of correcting time-domain reflectometers, two channels of a time-domain reflectometer are connected to a corrector using cables, and the two channels are enabled to transmit pulses. Parameters Step Deskew and Channel Deskew of the two channels are zeroed. Resistance values of the two channels are measured simultaneously, and the value of the parameter Step Deskew of one of the two channels is adjusted according to the Resistance values of the two channels. Times of achieving the same resistance value of the two channels are measured after the cables and the connector have been disconnected, and the value of the parameter Channel Deskew of one of the two channels is adjusted according to the times of achieving the same resistance value. The adjusted values of the parameters Step Deskew and Channel Deskew are displayed through a display unit.

Abstract: Switching a transmitting and receiving direction of two transducers (2,3) in the forward and the reverse direction, a time differential memory part (17b) storing a propagation time differential every K times a unit measurement process being executed, the propagation time differential being a differential between a propagation time of the ultrasonic wave signal in a forward direction and in a reverse direction, a flow rate calculating part (15) calculating a flow rate of a passing fluid based on a lump sum of propagation times in both the forward and the reverse directions obtained at least every K times of a unit measurement process being executed, an estimating part (18) estimating a change in a momentary flow rate of the fluid based on the time differential obtained every K times of the unit measurement process being executed and storing thereof in a time differential memory part (17b), thus obtaining an accurate flow rate and detecting the change in the momentary flow rate.

Abstract: The invention relates to a method for determining a setpoint value (pset) for the contact pressure of conveying rollers (29, 30) of at least one device (8) for conveying a welding wire (9) of a welding device (1), and a corresponding welding device (1).

Abstract: Systems and methods for specifying one or more operational parameters for a pumping system are disclosed. A first suction pressure loss profile for a first pump in a pumping system is determined. A second suction pressure loss profile for a second pump in the pumping system is determined. The first suction pressure loss profile is compared with the second suction pressure loss profile. One or more operational parameters are specified based, at least in part, on the comparison.

Abstract: Systems and methods of determining parameter values in a downhole environment are described. An example method of determining a parameter value using calibration information is described. The calibration information corresponding to different parameter ranges in a downhole environment. The method includes determining a parameter range in the downhole environment using a controller and obtaining first calibration information or second calibration information based on the parameter range. The first calibration information associated with a first parameter range and the second calibration information associated with a second parameter range. The method also includes receiving an output signal from a sensor associated with the parameter and using the obtained calibration information to determine the parameter value based on the output signal received.

Abstract: The different advantageous embodiments provide an apparatus and method for identifying an airspeed for an aircraft. In one advantageous embodiment, an apparatus is provided. The apparatus consists of a plurality of pitot-static probes. The plurality of pitot-static probes generate a first data. The apparatus also consists of a plurality of angle of attack sensor systems. The plurality of angle of attack sensor systems generate a second data. The apparatus also consists of a plurality of light detection and ranging sensors. The light detection and ranging sensors generates a third data. The apparatus also consists of a signal consolidation system configured to detect errors in the first data generated by the plurality of pitot-static probes, the second data generated by the plurality of angle of attack sensor systems, and the third data generated by the plurality of light detection and ranging sensors.

Abstract: A pressure transducer includes a sensor, a memory component, and a microprocessor. In one embodiment, a correction algorithm and set of compensation coefficients are provided and stored in the memory. The algorithm applies the compensation coefficients to determine a compensated pressure value. The pressure transducer may store the correction algorithm and the compensation coefficients for use in the field.

Abstract: A digital pressure transducer includes a sensor, a memory component and a microprocessor. A correction algorithm and set of correction coefficients are provided and stored in the memory. An application applies the correction coefficients to convert digitized values to pressure values. The transducer may include a read/write port adapted to communicate with a computer terminal; and at least one read-only port adapted to communicate with a host device. A method of calibrating a digital pressure transducer includes storing a correction algorithm and correction coefficients in the digital pressure transducer separate from a host device.

Abstract: A digital to analog conversion apparatus includes a plurality of gain/phase adjusters configured to receive a digital signal and to output a plurality of adjusted digital input signals, a plurality of digital to analog converters coupled to respective ones of the plurality of gain/phase adjusters and configured to receive the adjusted digital input signals and to generate respective analog signals representative of the adjusted digital input signals, a plurality of phase shift elements coupled to respective ones of the plurality of digital to analog converters and configured to shift the phases of the analog signals generated by the digital to analog converters, and a combiner coupled to the outputs of the plurality of digital to analog converters and configured to combine the respective phase-shifted analog signals to form an analog output signal.

Abstract: A singular sealed apparatus and method suitable for confirming pressure measurements in a rebreather prior to use of the rebreather. The singular sealed apparatus may have a canister lid, gas sensors and a processor, all from a rebreather, as well as a pressure sensor, an input device, a processor, an indicator and a pod with a pressure measurement outlet, a gas supply inlet, a relief valve and a gas exit valve. Alternatively, the singular sealed apparatus may have a gas sensor from a rebreather and an analyzer, a pressure sensor, an input device, a processor, an indicator, a lid and a pod with a pressure measurement outlet, a gas supply inlet, a relief valve and a gas exit valve.

Abstract: A system and method for the management of data collection from a pressure sensing apparatus. The system allows rapid measurement of pressure exerted upon a surface and may be useful in preventing bed sore development in a bed bound subject.

Abstract: The invention relates to a method for synchronizing sensors in a sensor array, including at least one electronic control unit and at least one sensor, which are connected to each other by a first and a second line, wherein the sensor is supplied with electric power by the first and second lines, and additionally at least one data signal (a) is transmitted by the first and second lines from the sensor to the electronic control unit, wherein the electronic control unit transmits a defined supply voltage signal having varying polarity as a synchronization signal (b, c) to the sensor, whereupon the sensor transmits at least one data signal (a) to the electronic control unit, after the polarity of the synchronization signal has been reversed.

Abstract: The invention relates to a monitoring system and method for accumulator banks including at least two pressure accumulators, the accumulator bank is coupled to a device and being adapted to provide a pressurized fluid into the device at pressure reductions in said device. The monitoring system comprises at least one sensor for detecting a chosen parameter in the accumulator bank at chosen intervals of time, and a recording unit for recording the sampled measured parameters, a storage device for storing predetermined characteristic information related to the pressure development in the accumulator bank during pressure reductions at the device and representing different numbers of active accumulators in the accumulator bank, and calculation means for comparing the recorded measured parameters with the stored characteristic information, and determining from this comparison the number of active accumulators in the accumulator bank.

Abstract: Calibrating a measuring cell arrangement having a diaphragm vacuum measuring cell having a programmable heater for heating the diaphragm vacuum measuring cell to a constant presettable temperature. The heater encompasses the measuring cells and is encompassed by an insulation jacket. The method includes setting a first heating temperature on the measuring cell to a constant preset value, performing a first calibration step by generating at least one preset pressure in a vacuum volume and obtaining vacuum measuring signals of the measuring cell and at least one reference measuring cell, storing pressure values in the memory, determining compensation values from the difference values of the measuring cell and the reference measuring cell, intermediately storing these difference values in a calibration data memory and gauging the measuring cell by transmitting the determined compensation values to the measuring cell data memory.

Abstract: The present invention provides a force sensor correcting method which is simple and capable of performing correction, with the force sensor remaining mounted at the end of an arm without an exchange of an end effector. In the present invention, a force sensor 1 of one robot 101 has already been corrected, and a force sensor 2 of the other robot 102 is an object to be corrected. First, hands 3a, 3b of a pair of robots 101, 102 are made to abut on each other (abutting step). A detected signal of the corrected force sensor 1 of the one robot 101, generated by execution of the abutting step, is converted into a measured value indicating a force or a moment (measurement step). Based on the measured value obtained in the measurement step, a value indicating a force or a moment acting on the hand 3b of the other robot 102 due to a reaction generated by the abutting step is obtained (calculation step).

Abstract: A method comprises steps for reconstructing in-cylinder pressure data from a vibration signal collected from a vibration sensor mounted on an engine component where it can generate a signal with a high signal-to-noise ratio, and correcting the vibration signal for errors introduced by vibration signal charge decay and sensor sensitivity. The correction factors are determined as a function of estimated motoring pressure and the measured vibration signal itself with each of these being associated with the same engine cycle. Accordingly, the method corrects for charge decay and changes in sensor sensitivity responsive to different engine conditions to allow greater accuracy in the reconstructed in-cylinder pressure data.

Abstract: An emulation system includes a central time source generating a time reference and an emulated spacecraft control processor which contains an embedded processor that provides an emulated input/output interface to communicate simulated spacecraft data. The embedded processor processes the simulated spacecraft data and contains a real time clock engine having a real-time clock period. The system further has a first simulation that processes attitude control system data from the emulated spacecraft control processor to simulate an attitude control system of the spacecraft in real-time. The first simulation engine operative to produce sensor data for input to the emulated spacecraft control processor based on the simulated system dynamics and adjusts the real time clock period in response to the time reference.

Abstract: The invention relates to an electronic pressure gauge for measuring the pressure inside a container, particularly a pressurized gas cylinder, said pressure gauge including: at least one pressure sensor; an electronic unit designed to acquire, store and process data; and at least one information device capable of transmitting at least one item of information. The pressure gauge also includes a first radio with a reception port, said first radio being connected to the electronic unit so as to receive external data in order to modify the operation or the configuration of the pressure gauge. The reception port of the first radio is designed to read data modulated in terms of the frequency and/or intensity of an external magnetic field at a first low frequency, for example a frequency between 50 and 300 khz.

Abstract: The present invention relates to a method and a device comprising a controller and a pressure sensor. The controller is configured to calibrate said pressure sensor based on a current position of said device and/or current pressure information received from a source.

Abstract: A gas analyzer using a quadrupole mass spectrometric method etc. is provided with an ionizer to ionize a sample gas, a first ion detector and a second ion detector each configured to detect a respective ion from ionizer, and each being disposed a respective distance from the ionizer on an opposite side of the ionizer, the respective distances being different from each other, a filter interposed between the ionizer and the first ion detector to selectively allow ions from the ionizer to pass therethrough, and an arithmetic device to correct a partial pressure of a specific component obtained from the first ion detector and selected by the filter by using a first total pressure of the sample gas obtained from the first ion detector and a second total pressure of the sample gas obtained from the second ion detector.

Abstract: The present document describes a ready to use sensing device which is auto-configurable when turned on. The sensing device includes one or more sensors and a communication port. When turned on, the system automatically contacts a central server via the communication port and requests the address of a second server with which the sensing device is associated. Upon receipt of the address of the second server, the sensing device contacts the second server and requests its customized configuration settings. When received, the configuration settings are installed, and the sensing device starts to sample the output of the sensors and sends the samples to the second server for storage. The user may view the measurement data by accessing the second server through the internet. The minimum memory capacity required for operating the sensing device is very low, due to the fact that the samples are sent to the second server every time the samples are taken.

Abstract: A method is provided for dispensing materials (20) with fluctuating viscosity over time, such as liquid adhesives. Using a control algorithm derived from viscosity data or lab testing results, a first pressure or mechanical drive speed is used to force viscous material (20) from a supply syringe (14) during a first dispensing cycle. After a certain amount of time, a correction model is applied to the control algorithm to increase the pressure or drive speed as viscosity of the material (20) increases. A second higher pressure or drive speed is then used to force viscous material (20) from the supply syringe (14) during a second dispensing cycle. The correction model can be based on empirical data about the viscous material (20), or a camera system (30) can be used to periodically adjust the pressure or drive speed as required to maintain a substantially uniform dispensing rate.

Abstract: A device and a method for calibrating load sensors which are provided at least one load cross-section of an aerofoil or control surface of an aircraft, the load sensors being calibrated on the basis of load coefficients (?i) of the load sensors, which load coefficients a calculation unit calculates by evaluating a linear system of equations formed by means of mechanical loading of the aerofoil or control surface.

Abstract: A method for calibrating sensors in a system including a plurality of sensors which are arranged so that they can be subjected to the same load includes the steps of detecting the level of an operating parameter for a certain load level individually by at least two of the sensors, calculating a mean value of the operating parameter for the sensors for the load level, determining a deviation from the mean value for each of the sensors, and saving the value of the deviations for use in operation of the system.

Abstract: A method for determining an unknown input measurand Punk of a sensor having a linear response at small input measurand levels and a non-linear response at large input measurand levels.

Abstract: A measurement instrument having a processor, a first sensor and a second sensor. The processor is adapted to output a measurement signal embodying a measurement of a physical quantity. The first sensor and second sensor are connected to the processor and are operable to generate respectively first and second measurements of the physical quantity. The processor defines a first measurement range within which the measurement signal is dependent on the first measurement and not the second measurement. The processor defines a second measurement range within which the measurement signal is dependent on the second measurement and not the first measurement. The first and second ranges meet at a predetermined transition. The first and second measurements are different at the transition and the measurement embodied in the measurement signal crosses the transition without an abrupt change.

Abstract: Systems and methods are provided for storing and recalling metrics associated with physiological signals. It may be determined that the value of a monitored physiological metric corresponds to a stored value. In such cases, a patient monitor may determine that a calibration is not desired. In some cases, a patient monitor may recall calibration parameters associated with the stored value if it determined that the stored value corresponds to the monitored metric value.

Abstract: A failure diagnosis apparatus for an exhaust pressure sensor for detecting the exhaust pressure in an exhaust gas recirculation passage which connects an exhaust passage and an intake passage of an internal combustion engine. A first preliminary determination that the exhaust pressure sensor is normal, is made when the engine is in a predetermined low load operating condition and a difference between the detected exhaust pressure and the atmospheric pressure is equal to or less than a first determination threshold value. A second preliminary determination that the exhaust pressure sensor is normal, is made when the engine is in a predetermined high load operating condition and the difference between the exhaust pressure detected by the exhaust pressure sensor and the atmospheric pressure is equal to or greater than a second determination threshold value. A final determination that the exhaust pressure sensor is normal, is made when both of the first and second preliminary determinations are made.

Abstract: A contact pressure and position detecting device includes a first sensing layer, a second sensing layer located on the first sensing layer, and a processor. The first sensing layer includes a number of parallel first pipes, and the second sensing layer includes a number of parallel second pipes perpendicular to the first pipes. Each first pipe includes a first pressure sensor received therein for generating a first electrical signal according to the gas pressure therein. Each second pipe includes a second pressure sensor received therein for generating a second electrical signal according to the gas pressure therein. The processor compares the first electrical signals with a first threshold value, and the second electrical signals with a second threshold value to judge which first pipe and second pipe is pressed, and then obtains the contact position on the detecting device.

Abstract: Embodiments of systems and methods for pressure measurement using optical sensors are disclosed that include a computer processor that executes logic instructions to receive data based on optical signals from an optical sensor. The data represents velocity of the object after being exposed to a first pressure force. The velocity is determined from an unshifted, reference optical signal and a Doppler-shifted optical signal reflected off the object. The pressure force applied to the object is determined based on the velocity of the object.

Abstract: The present invention is related to a method of controlling a device having a calibration process. The calibration process has a partial calibration routine and a calibration routine. A detector within the control system is capable of receiving one or more input signals and determining whether a partial calibration or calibration should occur. The first step in the process involves starting the control method where the detector receives input signals or generates it own data within the detector. The detector also determines whether a partial calibration routine or a calibration routine will take place based upon the value of the input signals received. A partial calibration routine will be performed if the input signals to the detector do not favor a calibration.

Abstract: A calibration apparatus includes a fixture, which is coupled to hold a distal end of a medical probe. A plurality of weights, which have respective masses and respective bottom surfaces that are oriented at respective angles with respect to the distal end of the probe, are coupled to rest on a distal tip of the probe so as to apply to the distal tip respective force vectors that cause a deformation of the distal tip relative to the distal end. A calibration processor is configured to receive from the probe measurements indicative of the deformation of the distal tip in response to the force vectors, and to compute, based on the measurements, the masses and the angles, calibration coefficients for assessing the force vectors as a function of the measurements.

Abstract: A method for correcting the drift of the signal from a sensor measuring the pressure in a cylinder of an internal combustion engine, the signal being comparable to a straight line of equation y=A×x+B, on which signal are overlaid pressure spikes, the correction method includes: I: using a rapid Kalman filter for detecting the points belonging to the pressure spikes, II: using a slow Kalman filter for determining of the slope (A) and of the constant (B), III: correcting, for each point, of the drift of the signal according to whether or not they belong to the detected pressure spikes determined during step I and the values of the slope and constant determined during the step II, wherin, during step I: the prediction error (epsR) on a point of the signal is estimated using the rapid Kalman filter, the standard deviation of this prediction error (eps sigma) is filtered and maximized, the start and/or end of a pressure spike at this point is determined according to at least one of the following two criteria:

Abstract: An embodiment of the invention provides a method for determining the pressure offset of an in-cylinder pressure sensor of an internal combustion engine, comprising the steps of: setting a plurality of couples of instants during an engine cycle within the cylinder; acquiring the pressure measured by the in-cylinder pressure sensor in each instant of each couple of instants; calculating a plurality of pressure offset values, each of which as a function of the pressures measured in a correspondent couple of instants (?iA, ?iB); setting an admissible pressure offset range; selecting the pressure offset values that fall within the admissible pressure offset range; and, if the number of selected pressure offset values is greater than a minimum allowable limit, calculating a final pressure offset as a function of the selected pressure offset values.

Abstract: A flow controller and a test method therefor are provided which enable testing of the flow control of a process gas passing through a fluid path during operation of semiconductor manufacturing apparatuses. While the flow control is being performed to adjust the flow rate through the fluid path to a flow rate set value, a predetermined number of pieces of test sampling information is collected and associated with the flow rate set value for storage. The test sampling information is made up of a detected flow rate value of the process gas, a detected pressure value, and valve drive control information delivered to a flow control valve mechanism. Then, coefficients of association are sequentially determined which indicate the associations of the predetermined number of detected flow rate values and pieces of valve drive control information, which are stored as the test sampling information.

Abstract: An electronic thermistor-based vacuum gauge and systems and methods of calibration and operation of the same that require no calibration against a known vacuum standard to obtain high accuracy through broad vacuum and ambient temperature ranges. Additional features of the invention include a construction and method of improving battery life, a construction and method of detecting faulty vacuum sensors, a method for determining the state of calibration of a vacuum sensor, a method of quantifying vacuum leak rates, and a method of automatically alerting an operator when an evacuation process has concluded.

Abstract: The present invention includes: a displacement altering unit for generating a displacement control pressure corresponding to a displacement control signal; an input unit for inputting a target displacement; a pressure calculating unit for calculating a displacement control pressure corresponding to the target displacement based upon predetermined reference characteristics of the displacement altering unit; a pressure detecting unit for detecting a pressure corresponding to the displacement control pressure; a signal calculating unit for calculating a displacement control signal corresponding to the input target displacement; and a correcting unit for correcting the displacement control signal calculated by the signal calculating unit based upon the displacement control pressure having been calculated by the pressure calculating unit and the measured pressure detected by the pressure detecting unit.

Abstract: This improved method of calibrating wood testing machines includes improved test bars, shim and software to direct the operator through the steps of calibration, storing interim results and calculating new calibration factors based on values read when the test bars are placed in the wood testing machine. This method avoids a number of problems in previous methods and apparatus. It properly corrects for changes in deflection in the measurement apparatus and changes in straightness of the test bars. The result is a more stable and reliable calibration that is referenced to precise measurement of the EI product for the test bar.