An apparatus includes a holder to support an indenter relative to a sample of material, a depth sensor, and a controller to execute instructions for performing operations. The operations include controlling the holder to apply a first force on the sample with the indenter and determining a first depth of the indenter based on first data generated by the depth sensor, controlling the holder to move the indenter from the first depth to a predetermined depth greater than the first depth, after the indenter is moved to the predetermined depth, controlling the holder to apply the first force on the sample with the indenter and determining a second depth of the indenter based on second data generated by the depth sensor, and determining a value indicative of hardness of the sample based on a difference between the first depth and the second depth.

A system includes a load actuator, a strain measurement device, and a computing device. The computing device is configured to receive an unconditioned displacement signal from the strain measurement device. The unconditioned displacement signal represents displacement of a specimen under load from the load actuator. The computing device is further configured to separate the unconditioned displacement signal into a measurement signal and a control signal. The computing device is further configured to filter the control signal to generate a filtered control signal and control the load actuator based on the filtered control signal. The computing device is further configured to determine a strain on the specimen based on the measurement signal.

The invention relates to a device for fitting a tablet testing device with a calibration unit. The calibration unit allows of calibrating and adjusting the velocity or breaking force of a breaking jaw of such tablet testing device, for determining the breaking hardness of tablets. The invention allows of calibrating the velocity of movement of the breaking jaw and the breaking hardness applied in timely intervals, as to comply with modern quality control standards for pharmaceutical instruments of measurement. The device is employed for temporarily fitting a tablet testing device for calibration, and is mounted onto the tablet testing device only for the purpose of conducting calibration runs, whilst storing the bulky and huge calibration device separate from the tablet testing device during times of normal operation.

A material tester is provided. A personal computer, as functional blocks of a program installed in a memory, includes a filtering processing part that eliminates noise from raw data acquired by digitalizing an input signal from a load cell or an extensometer, a filter setting part that sets a filtering condition applied to the raw data in the filtering processing part, and a display control part that displays the raw data and the processed data, for which the filtering process has been performed by the filtering processing part, at the same scale and in different forms on a display device in an overlapping manner.

An amplitude detecting method and a material tester are provided. As functional blocks of a program that is installed in a personal computer and is stored in a memory, a measurement noise eliminating part that eliminates measurement noise, a vibration noise eliminating part that eliminates vibration noise assumed to be caused by an inertial force according to a natural vibration according to reach of an impact of breakage or destruction of a test piece at the entire tester, an amplitude detecting part that detects the amplitude of a natural vibration superimposed in the data period used for evaluating material characteristics, and a display control part that controls display of an amplitude value of the natural vibration and a test result on the display device are included.

An error compensation system and method may include applying a mechanical load to a reference sample to obtain a load measurement signal from the load sensor and a displacement measurement signal from the displacement sensor, calculating a transfer function to create a load filter and a displacement filter to be applied to the load measurement signal and the displacement measurement signal, respectively, applying the load filter to the load measurement signal to calculate a load compensation value, and applying the displacement filter to the displacement measurement signal to calculate a displacement compensation value, and determining the compensated value by comparing the load compensation value with the displacement compensation value, wherein the compensated value is determined prior to testing a specimen so that the compensated value is used to automatically correct a measured deflection of the specimen to arrive at an actual specimen deflection.

The present invention relates to a torque or force calibration device for a unit intended to measure or to apply a torque or a force respectively, said device comprising a first part, a second part and at least one flexible element linking the first part to the second part, the second part being mounted to be mobile in rotation or in translation relative to the fixed first part, the device comprising an abutment which limits the displacement of the second part and thereby sets the maximum torque or the maximum force of the calibration device.

A breakage point is detected as a change point from raw data and the data is divided before and after the breakage point to obtain divided data D1 and D2. When the low-pass filtering is performed on each of the divided data D1 and D2 (step S13) and the filtering for all divided data ends, time-series data whose natural frequency is removed is reconstructed before and after the breakage point. When the reconstruction data are connected at the breakage point, it is possible to restore the time-series data of the test force to the time-series data whose natural vibration of the test machine body is removed while taking advantage of a change in test force at the breakage point.

The disclosure provides a tensile testing machine and includes: a processing filter that removes a noise component included in a test force measurement signal output from a load cell; and an adjustment unit that adjusts a frequency characteristic of the processing filter. The adjustment unit receives a detection signal output from the sensor, and adjusts the frequency characteristic of the processing filter on a basis of a difference between output signals of two low-pass filters having different frequency characteristics.

A method of controlling a mechanical testing instrument includes estimating a young's modulus, and applying force during a first time interval then comparing distance measured to expected distance; predicting a distance based on a first slope applying displacement distance and recalculating the slope; providing a corrected force applied for the proper displacement based on measured modulus and correction factor and adjusting into time and distance coherence; applying a force versus time regime interval and predict deformation at the end of the second interval measuring true deformation distance after the next interval; calculating the true slope based on the extrapolated actual slope; calculating a slope to apply for desired distance; and repeating measurement and correction steps, using the actual slope as the prediction basis. A system for carrying out the method is also disclosed using a data acquisition board.