What are the terms about the characteristics of universal testing machines?

Jinan Hengsi Shanda Instruments mainly producesElectronic universal testing machine,Hydraulic universal testing machineMore than 300 products in more than ten series, tensile testing machine, torsion testing machine, etc. Jinan HengSishengda Instruments can also customize various non-standard testing machines, non-standard fixtures and special accessories according to customer requirements.
1. First of all, the response change of the sensitivity measurement test machine. In addition to the corresponding excitation change, the sensitivity reflects the measurement (input) change caused by the instrument display value (input) of the measurement test machine (input)) the degree of change. It is expressed by the quotient of the increment of the observed variable, that is, the response (input amount) and the corresponding measured increment, that is, the excitation (input amount). If the measured change is veryIf the indicator value (output amount) caused by a large change, the sensitivity of the measuring test machine will be high. Force sensors and displacement sensors used in electronic universal material testing machinesThe devices are linear, and their sensitivity S is: S=△y/△x=K=K in the constant formula is called the transfer coefficient. When the response y and excitation x are the same quantity, it is also called the amplification coefficient. forFor nonlinear measuring instruments, the sensitivity should be expressed as: S=dy/dx=f(x) At this time, the sensitivity varies with the excitation change. It is a variable, which is related to the excitation value. spiritSensitivity is a very important metrological characteristic in measuring instruments, and it is an important indicator that reflects the accuracy of measuring instruments. But sometimes the sensitivity is not the better,The reading is done to stabilize the display value and the sensitivity size needs to be deliberately reduced.

2. It is the discriminant force [threshold] that causes the measurement test machine to produce an undetected excitation change, and this excitation change should be carried out slowly and monotonically. It refers to the testThe measurement test machine gives a certain input at a certain display value, and the excitation change is gradually increased from a single direction. When the output of the measuring instrument generates a perceptible response change,The excitation change of this input is called the discriminatory threshold, or it can be referred to as the discriminatory power for short, and can also be performed on the reverse stroke. For example, a 500N electronic tension tester is generated at the end of the display screenThe small load change that can be perceived is 0.1N, and the discriminant threshold of this test machine is 0.1N. In order to accurately obtain its discriminant threshold, the change in excitation (input amountChanges should be slow and should be done on the same stroke to eliminate inertia or the gaps and frictions of the internal transmission mechanism. Usually, the discriminant threshold of a measuring instrument should be within the standardThe positive and reverse strokes of the upper, middle and lower values ​​of the ruler are measured in the opposite direction, and the discriminating threshold is different, and the measurement instrument identification can be represented by its excitation change.Force-insertion threshold. Discriminant thresholds are sometimes used to being called sensitivity thresholds or sensitivity limits, which are the same concept. Pay attention to the difference and relationship between sensitivity and discriminant threshold. This isTwo concepts: sensitivity is the degree of change in the measurement instrument display value (output quantity) caused by the change in the measurement instrument display value (output quantity); the discriminant threshold is the result of the detection value (output quantity) of the measurement instrument.The small change value measured (input amount) when observing the change refers to the small value to be input to move the pointer of the measuring instrument (or the last number change). But the two are related,The higher the sensitivity, the smaller the discriminatory threshold; the lower the sensitivity, the greater the discriminatory threshold.

3. Secondly, the [display device] resolution display device can effectively distinguish small display value differences. Resolution refers to the ability to distinguish small display value differences in the display device. PassThe resolution of a normal analog display device is 1/2 to 1/10 of the scale index value, that is, 1/2 to 1/10 of a scale index value can be distinguished with the naked eye; for digital display deviceThe resolution of a number that is the last digit, and the resolution of a semi-digital display device is a index of the last digit. This concept can also be applied to recording instruments. showThe resolution of the device can be referred to as the resolution of the device for abbreviation. We should distinguish the concepts of discrimination and discrimination threshold, and do not confuse the two. Because the discriminant threshold must be in operation on the measuring instrumentThe numerical value can only be evaluated and determined through experiments, which illustrates the small excitation value required for the response to the observation of the change. The resolution is to observe the display device, even if it is aIt can be determined by inactive measuring instruments, which illustrates the discrimination ability of small display values. High resolution can reduce reading errors, thereby reducing measurements caused by reading errorseffect of quantity results. To improve resolution, there are often many factors, such as indicating instruments that can increase the spacing between scales, specify the engraving lines and pointer widths, and specify the pointer and dial.The distance between them, etc.; for digital display devices, it should be increased to be effective.
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