Open Access
Table 2
Uncertainty budget of the constituent elements of the measuring channel of vibration acceleration.
| Elements | Value of relative uncertainty, % | The expanded uncertainty (coverage factor 1.96 at confidence level 95%), % | Distribution |
|---|---|---|---|
| Аccelerometer | 0.3 | 0.59 | Uniform (rectangular) |
| Preliminary charge amplifier | 0.02 | 0.04 | Uniform (rectangular) |
| Bandpass filter | 0.2 | 0.39 | Uniform (rectangular) |
| Scale converter | 0.01 | 0.02 | Uniform (rectangular) |
| ADC | 0.005 | 0.01 | Uniform (rectangular) |
| Background noise | 2.14 × 10−6 | 4.19 × 10−6 | Normal |
The combined standard uncertainty ( ) |
0.36 | 0.71 | Normal |
| Mean value | 2.34 m/s2 |
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