Sample Calculation, Meter Output; Calc. Of Input For Full Scale Integrated Output - GE Bently Nevada 3300/25 Operation Manual

21.3.2

Sample Calculation, Meter 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
The transducer voltage that is applied to the input of the monitor is 0.1V peak. This signal
can be simulated by applying a 0.1V peak (at 100 Hz) signal to the input of the monitor.
Step 2. Calculate the front panel meter reading:
Vsig = 0.1 V peak
F = 100 Hz
SF = 100 mV/g
The conversion factor, K, is found in the table in
measured in mm/sec and the input signal is measured in peak: K = 15,607.77
The front panel meter will read 16 mm/sec (peak).

21.4 Calc. of Input for Full Scale Integrated Output

K ( peak ) = 2 × π ×
Where:
K (peak) is the calculated input voltage, expressed in V peak.
F is the signal frequency in Cy/sec.
MFS is the peak full-scale meter reading, expressed in peak.
Accel SF is the accelerometer scale factor, 100mV/g.
g conversion is expressed as 9807 (mm/sec
If you wish to express K in RMS:
1 ( g peak
15
0 1 . V ( peak × )
Accel
MFS × F ×
g conversion
K RMS =
Section 21 - Appendix D–Integrated Signals
× ) 0 1 . = 0 1 . V
V
g
Section 21.3. The meter scale is
, 607 . 77
= 15 . 608
mm
100 Hz
SF
)/g or 386.09 (in/sec
2
K ( peak )
. 1 414
sec
)/g.
2
141