© Brüel & Kjaer Vibro ● S1079330.002 / V04 ● █ Page 171 of 188
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Brüel & Kjaer Vibro │ Instruction
VC-8000 MPS
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24.2.3 Aero-Derivative Velocity
Typical uses: Aero-Derivative Gas Turbines with Aero Interface Modules using Band Pass Filters
Measurement Description Default or Add
Band-pass
Band-pass filtered dynamic amplitude measurement.
Commonly used for a narrow band velocity measurement.
-48 dB/octave (8 pole) roll-on, roll-off.
Band-pass
Band-pass filtered dynamic amplitude measurement. May
be used for a wideband velocity measurement.
-48 dB/octave (8 pole) roll-on, roll-off.
DC sensor bias for diagnostics.
24.3 Diagnostic Channels
Diagnostic channels are standard channel types but with default settings typical for a Machinery
Diagnostic Services (MDS) engineer using a portable VC-8000 system (for high speed data
collection) and connected to the buffered output of an existing protection system.
24.3.1 Diagnostic Proximity (Radial Vibration)
Same measurements as the standard Radial Vibration Channel
24.3.2 Diagnostic Velocity
Same measurements as the standard Velocity channel.
24.3.3 Diagnostic Acceleration
Same measurements as the standard Acceleration channel.
24.3.4 General Dynamic
Typical uses: Basic (undefined) channel type for large voltage range +/- 24 Vdc or special
circumstances (like for special sensor and unit i.e. a current clamp and Amps).
Measurement Description Default or Add
Direct
Overall dynamic amplitude measurement.
24 dB/octave (4 pole) roll-on, -24 dB/octave (4 pole) roll-off.
DC sensor bias voltage for diagnostics.
24.4 Hydro and Low Speed Machines
24.4.1 Accel Slow RMS
Typical uses: Vibration monitoring with a slower RMS detector.
Measurement Description Default or Add
Direct
Overall dynamic amplitude measurement. RMS value
calculated over a 30-s interval.
24 dB/octave (4 pole) roll-on, -24 dB/octave (4 pole) roll-off.
DC sensor bias voltage for diagnostics.
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