Accuracy Of Vibration Inputs; Accuracy Of Vibration Inputs For Yvibs1B; Accuracy Of Position Inputs; Accuracy Of Position Inputs For Yvibs1B - GE Mark VIeS System Manual

8.3.1.1 Accuracy of Vibration Inputs

Vibration Inputs
Measurement
Eddy-Current or
Proximity (channels 1 - Displacement
8)
Seismic (channels 1 - 8)
Velomitor (channels 1 -
8)
Accelerometer
(channels 1 - 3)
Bently Nevada CDM
PCB CDM
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

Position Inputs Measurement
Position Displacement
(Gap)
Displacement
(Gap)
Speed
Phase
Keyphasor
Phase is only
calculated when RPM is
greater than
approximately 250
RPM.
1x vibration component with respect to key slot
YVIB Vibration Monitor Modules

Accuracy of Vibration Inputs for YVIBS1B

Range
(V dc + V ac)
-20.0 to 0.0 V
peak
-2.5 to +2.5 V
Velocity
peak
-17.0 to -7.0 V
Velocity
peak
-12.5 to -7.5 V
Velocity
peak
-15.0 to -5.0 V
Dynamic
peak
Pressure
5.0 to 15.0 V
Dynamic
peak
Pressure

Accuracy of Position Inputs for YVIBS1B

Range
-0.5 to -20 V dc
-0.5 to -20 V dc
N/A
N/A
Public Information
Default
Hardware
(V ac portion)
Gain
0 to 3.0 V pp
1x
0 to 1.0 V
4x
peak
0 to 5 V peak
2x
0 to 2.5 V
4x
peak
-5.0 to 5.0 V
2x
peak
-5.0 to 5.0 V
2x
peak
Frequency
N/A
N/A
2 to 20,000 RPM
Up to 333 Hz
333 to 667 Hz
Default
Accuracy at min & max
Hardware
frequency range
Offset
+/-0.020 Vpp at 10 Hz
+/-0.023 Vpp at 200 Hz
10
+/-0.023 Vpp at 200 Hz
+/-0.056 Vpp at 700 Hz
+/-0.010 Vp at 10 Hz
+/-0.012 Vp at 200 Hz
0
+/-0.012 Vp at 200 Hz
+/-0.034 Vp at 700 Hz
+/-0.010 Vp at 10 Hz
+/-0.020 Vp at 200 Hz
12
+/-0.020 Vp at 200 Hz
+/-0.130 Vp at 700 Hz
+/-0.010 Vp at 10 Hz
10
+/-0.025 Vp at 350 Hz
+/-0.010 Vp at 10 Hz
10
+/-0.132 Vp at 1000 Hz
+/-0.010 Vp at 10 Hz
-10
+/-0.132 Vp at 1000 Hz
Accuracy
+/-0.020 Vpp at 10 Hz
+/-0.020 Vpp at 10 Hz
+/-0.1% of full scale
speed
+/-0.5 degree
+/-1 degree
GEH-6855_Vol_II System Guide 235