Key points for selecting and selecting test machine for purchasing personnel

1. Select resolution and dynamic performance

A, select the resolution and dynamic performance

Resolution is an important parameter of the test machine. Appropriate resolution will be conducive to the measured resolution and measure smaller indexing. The effective resolution and dynamic performance are a contradiction. Blindly improving the effective resolution is at the expense of dynamic performance (bandwidth). The direct result of the reduction in bandwidth is that the material yield fluctuations are not obvious or even yielding is a platform phenomenon, so when selecting the model, this pair of parameters must also be considered effectively;

Resolution is an important parameter of test machine, the appropriate resolution will be conduct to the measurement resolution, measuring a smaller degree, the effecterosolution and dynamic performance are a pair of contractions, improve the effecterosolution blindly at the expense of dynamic performance (bandwidth) is cost, bandwidthreduction results as a direct result of the material the yield fluctuation is not obvious or even yield is a platform phenomenonon, so the selection is also effective to consider the parameters;

2. Select the accuracy level

Two, choose the precision grade

At present, the accuracy of domestic test machines is generally used in level 1 and level 0.5. It is sufficient to choose a level 1 test machine for general material tests. There is no need to spend more money to improve the accuracy. For scientific research and material analysis, a level 0.5 test machine is required. In fact, the technical differences for level 0.5 and level 1 test machines are not obvious. The calibration methods and methods are basically the same. This is the difference in correction points. With the development of sensor technology, the linearity of sensor elements has reached a very high level. As long as the measurement circuit has no defects and the anti-interference performance is good, all test machines will reach level 0.5 accuracy.

At present domestic testing machine accuracy generally use 1 level and 0.5 level two, formatives testing general choice test machine level 1 enough, there is no need to spend more money to improve accuracy, testing machine for analysis of scientific research and material needs 0.5 level accuracy; in fact for testing machine 0.5 level and 1 level precision in the technology is not significantly different, methods and Means of verification is basically the same, this is fixed point is not the same, along with the development of sensor technology, sensor linearity has reached a very high level, as long as the measurementcircuit has no defect, anti-jamming performance is good, all test machine will reach 0.5 level accuracy is no problem;

3. Select the range

Three, select the range

Select the required test machine load (i.e. range) according to the load of the test material. It is best to select the material test load at about 70%-90% of the test machine range. This not only ensures the resolution of the test but also extends the service life of the test machine;

The maximum load testing machine according to the maximum load test materials needed (Ji Liangcheng), the recommended material test load on the test machine range 70% -- 90% for good, this can not only ensure the test resolution can also extend the service life of themachine;