PERFORMANCE PLOTS
30
25
20
15
10
5
Noise Distribution | X Axis
30
25
20
15
10
5
Noise Distribution | Y Axis
0
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
15
Deviation from Mean (G, one bin per LSB)
Noise Distribution | Z Axis
1.4
Deviation from Mean (G, one bin per LSB)
Typical Frequency Roll Off
1.2
1
10
0.8
0.6
5
0.4
0.2
0
-0.1
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
1
0
10
1
10
2
10
3
10
4
Deviation from Mean (G, one bin per LSB)
“Noise” in this document refers to sample-to-sample
deviations of the measured signal from the actual value
due to internally-generated electrical interference,
thermal effects and other factors (not acoustic
sounds). Random noise is statistical in nature and
follows a Gaussian (bell-curve) distribution, thus a
histogram is normally used to quantify its distribution
in a given signal.
For the noise measurement, a sample Slam Stick
recording was taken at room temperature with no
vibrations present. The plots above represent the
Vibration Frequency (Hz)
distribution of noise in the recorded data for each axis.
This distribution is approximately Guassian, with the
majority of samples falling very close to the correct
value and less frequent outliers falling further from the
correct value. This distribution is typical of random
noise present in any measurement.
Each bin represents one LSB (Least Significant Bit, or
the minimum G-level difference that can be
represented, by a 1-bit change, in the recorder ’s digital
output), while the X axis shows the corresponding error
in Gs and the Y axis value indicates the percentage of
REVISION N0. 001
REVISION DATE: 08-24-2010
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