Material testing machine and control method of material testing machine

1. A material testing machine comprising:

a processing filter that removes a noise component included in a detection signal output from a sensor; and

an adjustment unit that adjusts a frequency characteristic of the processing filter,

wherein the adjustment unit receives the 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 and serving as the processing filter.

2. The material testing machine according to claim 1 , wherein

an output signal of the processing filter is used as a display signal to be displayed on a display.

3. The material testing machine according to claim 1 , further comprising:

a first determination unit that determines whether the difference between the output signals of the two low-pass filters is equal to or larger than a first threshold value, wherein

the processing filter is configured by a low-pass filter, and

the adjustment unit decreases a cutoff frequency of the processing filter according to a determination result of the first determination unit.

4. The material testing machine according to claim 3 , further comprising:

a first low-pass filter having a cutoff frequency of a first frequency;

a second low-pass filter having a cutoff frequency of a second frequency lower than the first frequency;

a third low-pass filter having a cutoff frequency of a third frequency lower than the second frequency; and

a selection unit that selects the two low-pass filters from among the first low-pass filter, the second low-pass filter, and the third low-pass filter, wherein

in a case where the second low-pass filter is set as the processing filter, the selection unit selects the first low-pass filter and the second low-pass filter as the two low-pass filters, and

the adjustment unit switches the processing filter from the second low-pass filter to the third low-pass filter according to the determination result of the first determination unit.

5. The material testing machine according to claim 1 , further comprising:

a second determination unit that determines whether a difference between output signals of the two low-pass filters is equal to or less than a second threshold value, wherein

the processing filter is configured by a low-pass filter, and

the adjustment unit increases a cutoff frequency of the processing filter according to a determination result of the second determination unit.

6. The material testing machine according to claim 5 , further comprising:

a first low-pass filter having a cutoff frequency of a first frequency;

a second low-pass filter having a cutoff frequency of a second frequency lower than the first frequency;

a third low-pass filter having a cutoff frequency of a third frequency lower than the second frequency; and

a selection unit that selects the two low-pass filters from among the first low-pass filter, the second low-pass filter, and the third low-pass filter, wherein

in a case where the third low-pass filter is set as the processing filter, the selection unit selects the first low-pass filter and the third low-pass filter as the two low-pass filters, and

the adjustment unit switches the processing filter from the third low-pass filter to the second low-pass filter according to the determination result of the second determination unit.

7. A control method of a material testing machine which includes a processing filter of removing a noise component included in a detection signal output from a sensor, the control method comprising:

receiving the detection signal output from the sensor;

adjusting a frequency characteristic of the processing filter on a basis of a difference between output signals of two low-pass filters having different frequency characteristics and serving as the processing filter.