The GE/Bently Nevada Digital Vector Filter 3 (DVF 3) is a data acquisition instrument engineered for precision vibration analysis on rotating machinery. It acquires, processes, and presents amplitude, phase, and shaft rotative speed data to enable machine balancing, rotor response evaluation, and shaft crack detection. The DVF 3 documents vibration signatures during transient conditions (runup, coastdown) and steady-state operation, making it essential for condition-based maintenance and diagnostic troubleshooting in industrial environments.
Technical Specifications
Inputs
• Two vibration transducer inputs: displacement (proximity), velocity, or acceleration
• One dedicated Keyphasor input for once-per-revolution pulse signals
• Keyphasor sources: proximity probe, optical pickup, or strobe light
Tracking Filter
• Bandwidth adjustable from 12 to 120 cpm
• Tuned automatically by Keyphasor signal to shaft rotational speed
Output & Data Display
• Amplitude, phase, and shaft rotative speed data
• Bode and Polar plot formats
• Automatic signal sweeping
• Metric or English unit display options
• Alphanumeric display with menu-driven interface
– Key Features
Keyphasor Functionality
• Measures shaft rotative speed directly
• Provides phase reference angle measurement point
• Optical pickup integration enables phase measurement without trial run requirements
Signal Conditioning
• Optical pickup operation requires Keyphasor Conditioner and Power Supply or DVF 3 internal conditioning
• Supports all common transducer types without external adapters
– Typical Applications
• Machine balancing and rotor dynamics evaluation
• Shaft crack and fault detection
• Transient vibration monitoring during startup and shutdown
• Steady-state machinery condition assessment
• Phase-critical diagnostics requiring direct shaft reference
– Compatibility & Integration
Accepts displacement, velocity, and acceleration transducers. Keyphasor inputs accommodate proximity probes, optical pickups, and strobe light signals. Rugged, lightweight construction rated for industrial field deployment.
