BRUEL & KJAER 4292 Instructions And Applications page 15

7. From the meter indication the measured vibration acceleration
(m/sec 2 ), velocity (m/sec) or displacement (mm) can be derived from:
Meter indication (Volts) x INTEGRATION SWITCH setting (Accel.
m/sec 2 , Velocity m/sec or Displacement m)
X
100 for measurements
using an accerometer with a sensitivity less than 15 m V /g, or x 10 for
accelerometers with a sensitivity greater than 15 m V /g.
Example:
For vibration measurements using an accelerometer with a sensitivity
of 9.9 mV/g and an INTEGRATION SWITCH setting of "Accel.
10 m/sec 2 } the measured acceleration level for a meter indication of
0.78 V peak can be calculated as follows:
Acceleration level= 0.78 x 10 x 100
Acceleration level = 780 m/sec2 · peak
Example:
For vibration measurements using an accelerometer with a sensitivity
of
20
mV/g and an INTEGRATION SWITCH setting "Velocity
0.3 m/sec" the measured velocity level for a meter indication of 1.5 V
RMS can be calculated as follows:
Velocity level= 1.5 x 0.3 x 10
Velocity level= 4.5 m/sec RMS.
Example:
For vibration measurements using an accelerometer with a sensitivity
of 9.9 mV/g and an INTEGRATION SWITCH setting of "Displace-
ment 0.1 mm", the measured displacement level for a meter indica-
tion of 1. 7 V peak can be calcu Ia ted as follows:
Displacement level= 1.7 x 0.1 x 100
Displacement level = 17 mm peak.
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