BRUEL & KJAER VIBROCONTROL 8000 - 13.2.4 Synchronous Waveforms; 13.2.5 Asynchronous Waveforms

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13.2.4 Synchronous Waveforms
Synchronous Waveform data collection is configured in terms of the number of samples collected per
shaft revolution, evenly spaced in phase. Higher sample rates give better Orbit and Timebase plot
resolution, but more coarse resolution for spectrums displayed in orders. More samples (or
revolutions) take longer to collect and provide greater spectrum resolution. The collection time of
synchronous waveforms is dependent on the speed of the machine.
Rate
Maximum
Speed
Number of
Samples
Revolutions
Spectrum
Range
Spectrum
Resolution
128X
12,500 rpm
1024
8
50X
0.125X
2048
16
50X
0.0625X
64X
25,000 rpm
1024
16
25X
0.0625X
2048
32
25X
0.03125X
32X
50,000 rpm
1024
32
20X
0.03125X
2048
64
10X
0.015625X
16X
100,000 rpm
1024
64
5X
0.015625X
2048
128
5X
0.0078125X
Table 13-5) Synchronous Sampling Configuration Examples
13.2.5 Asynchronous Waveforms
Synchronous Waveform data collection is configured in terms of the number of samples collected per
shaft revolution, evenly spaced in phase. Higher sample rates give better Orbit and Timebase plot
resolution, but more coarse resolution for spectrums displayed in orders. More samples (or
revolutions) take longer to collect and provide greater spectrum resolution. The collection time of
synchronous waveforms is dependent on the speed of the machine.
Samples per Second Span Samples (Lines) Resolution Time to Collect
256
100 Hz
1024 (400)
0.25 Hz, 15 cpm
4 s
2048 (800)
0.125 Hz, 7.5 cpm
8 s
512
200 Hz
1024 (400)
0.5 Hz, 30 cpm
2 s
2048 (800)
0.25 Hz, 15 cpm
4 s
1280
500 Hz
1024 (400)
1.25 Hz, 75 cpm
0.8 s
2048 (800)
0.625 Hz, 37.5 cpm
1.6 s
2560
1000 Hz
1024 (400)
2.5 Hz, 150 cpm
400 ms
2048 (800)
1.25 Hz, 75 cpm
800 ms
5120
2000 Hz
1024 (400)
5 Hz, 300 cpm
200 ms
2048 (800)
2.5 Hz, 150 cpm
400 ms
1280
5000 Hz
1024 (400)
12.5 Hz, 750 cpm
80 ms
2048 (800)
6.25 Hz, 375 cpm
160 ms
25600
10000 Hz
1024 (400)
25 Hz, 1500 cpm
40 ms
2048 (800)
12.5 Hz, 750 cpm
80 ms
51200
20000 Hz
1024 (400)
50 Hz, 3000 cpm
20 ms
2048 (800)
25 Hz, 1500 cpm
80 ms
Table 13-6) Asynchronous Sampling Configuration Examples