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3300/25 Dual Accelerometer Input Monitor Operation Manual
21. Appendix D–Integrated Signals
21.1 Integrator Response
The integrator circuit converts a 100 mV/g acceleration signal to a 500 mV/in/sec
velocity signal. The 0 dB (unity gain) frequency of the integrator occurs at approximately
307 HZ. The 0 dB frequency is the frequency where the gain is equal to unity, that is,
where the output voltage is the same as the input voltage. The integrated signal has the
same frequency as the input frequency.
Since the integrator gain increases at lower frequencies, low frequency signals can
cause the monitor to exceed full scale (saturate).
This is a graph of the response of the integrator / gain circuit:
30
25
20
15
10
Gain
(dB)
5
0
-5
-10
-15
Frequency
(Hz)
Rotational
Speed
(CPM)
136
Ideal Response
Actual Response
1
60
10.5
100
630
6,000
307
1000
18,420
60,000
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