8.3.1.1
Accuracy of Vibration Inputs
Accuracy of Vibration Inputs for YVIBS1B
Vibration Inputs
Measurement
Range
Default
Hardware
Gain
Default
Hardware
Offset
Accuracy at min & max
frequency range
(V dc + V ac)
(V ac portion)
Eddy-Current or
Proximity (channels 1 -
8)
Displacement
-20.0 to 0.0 V
peak
0 to 3.0 V pp
1x
10
+/-0.020 Vpp at 10 Hz
+/-0.023 Vpp at 200 Hz
+/-0.023 Vpp at 200 Hz
+/-0.056 Vpp at 700 Hz
Seismic (channels 1 - 8)
Velocity
-2.5 to +2.5 V
peak
0 to 1.0 V
peak
4x
0
+/-0.010 Vp at 10 Hz
+/-0.012 Vp at 200 Hz
+/-0.012 Vp at 200 Hz
+/-0.034 Vp at 700 Hz
Velomitor (channels 1 -
8)
Velocity
-17.0 to -7.0 V
peak
0 to 5 V peak
2x
12
+/-0.010 Vp at 10 Hz
+/-0.020 Vp at 200 Hz
+/-0.020 Vp at 200 Hz
+/-0.130 Vp at 700 Hz
Accelerometer
(channels 1 - 3)
Velocity
-12.5 to -7.5 V
peak
0 to 2.5 V
peak
4x
10
+/-0.010 Vp at 10 Hz
+/-0.025 Vp at 350 Hz
Bently Nevada CDM
Dynamic
Pressure
-15.0 to -5.0 V
peak
-5.0 to 5.0 V
peak
2x
10
+/-0.010 Vp at 10 Hz
+/-0.132 Vp at 1000 Hz
PCB CDM
Dynamic
Pressure
5.0 to 15.0 V
peak
-5.0 to 5.0 V
peak
2x
-10
+/-0.010 Vp at 10 Hz
+/-0.132 Vp at 1000 Hz
The accuracies specified are worst case numbers, and assume the Vibration module sample frequency is in sync with the input waveform
frequency, preventing the A/D sample point from moving along the waveform and reading the actual peak value. The worst case accuracy is
based on missing the maximum peak V ac measurement per the table by half the sample period relative to the input fundamental frequency.
8.3.1.2
Accuracy of Position Inputs
Accuracy of Position Inputs for YVIBS1B
Position Inputs
Measurement
Range
Frequency
Accuracy
Position
Displacement
(Gap)
-0.5 to -20 V dc
N/A
+/-0.020 Vpp at 10 Hz
Keyphasor
Displacement
(Gap)
-0.5 to -20 V dc
N/A
+/-0.020 Vpp at 10 Hz
Speed
N/A
2 to 20,000 RPM
+/-0.1% of full scale
speed
Phase
Phase is only
calculated when RPM is
greater than
approximately 250
RPM.
N/A
Up to 333 Hz
+/-0.5 degree
333 to 667 Hz
+/-1 degree
1x vibration component with respect to key slot
YVIB Vibration Monitor Modules
GEH-6855_Vol_II System Guide 235
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