Product Details:

Bently Nevada 77581-01 is the Digital Vector Filter 3 module, a high-performance rotor vibration analysis module designed for rotating machinery transient and steady-state vibration testing. This signal processor accepts input signals from proximity probes, velocity sensors and accelerometers, together with a keyphasor signal to track rotor rotational speed and extract synchronous vibration amplitude and phase information. The digital vector filter 3 can carry out precise tracking filtering for rotational frequency vibration components, separating synchronous vibration from broadband background noise, which is critical for rotor dynamic analysis such as startup, coast-down and load change conditions of steam turbines and centrifugal compressors. It supports Bode plot, polar plot and trend curve generation, helping engineers observe vibration vector changes during rotor acceleration and deceleration, identify critical speed, rotor imbalance, shaft misalignment and oil whirl faults. The 77581-01 integrates high-precision signal sampling circuits and adjustable tracking filter bandwidth, and can process dual vibration input channels plus one independent keyphasor channel. It provides analog plotter output and digital data interface to transmit vibration vector data to recorders, DCS and analysis workstations for offline review and fault diagnosis. The module adopts industrial rack mounting structure, with strong anti-electromagnetic interference performance, and can operate stably under mechanical vibration and electrical noise in power plants and petrochemical facilities. It supports long-term continuous monitoring and transient data capture, and is widely used in power generation, petrochemical and metallurgy industries for rotor dynamic testing of steam turbines, generators and large compressors. This transient vibration signal processor provides accurate amplitude and phase data for machinery condition assessment, supports advanced rotor dynamic analysis, helps engineers evaluate rotor health and avoid resonance-related catastrophic equipment failures.

Core Attributes:

Brand: Bently Nevada

Model: 77581-01

Product Type: Digital Vector Filter 3 / Rotor Vibration Analysis Module

Input Channels: Dual vibration input channels, one keyphasor input channel

Function: Synchronous vibration amplitude & phase extraction, tracking filtering, Bode and polar plot generation

Output: Analog plotter output, digital data interface

Mounting: Rack mount

Feature: Rotor speed tracking, noise suppression, transient startup/coast-down data capture, rotor dynamic fault analysis