GE Bently Nevada 3300/25 - Sample Calculation, Buffered Output; Derivation of Integrated Signal Voltage

3300/25 Dual Accelerometer Input Monitor Operation Manual
138
21.2.1 Sample Calculation, Buffered Output
Monitor is configured as: BB or CC option 16 (50 mm/sec (peak))
Input vibration level is: 1g (peak)
Input signal frequency is: 100 Hz = 6000 CPM
Transducer scale factor is: 100 mV/g
Step 1. Calculate transducer output voltage.
Vib = 1g (peak)
SF = 100 mV/g
Vsig=V1.0=1.0×)peak(g1
g
V
Step 2.
)peak(V3091.0=
1+)100×009097(.
645.29×1.0
=Vout
2
The signal at the buffered output is 0.3091 V (peak) or equivalently 0.2186 V (RMS).
21.2.2 Derivation of Integrated Signal Voltage
The transfer function of the integrator and the gain block is:
4×
Z
Z
=)S(Y
i
f
Where:
Z
f
is the feedback impedance:
f
f
f
f
f
SC
1
+R
SC
1
×R
=Z
Z
i
is the input impedance:
II
R=Z
F×π×2×i=ω×i=S