OK Instruments OK-ES-3.0011 Electromagnetic Vertical Vibration Shaker

Overview

The OK Instruments OK-ES-3.0011 Electromagnetic Vertical Vibration Shaker is a precision-engineered electrodynamic vibration testing system designed for controlled sinusoidal, random, and shock excitation in the vertical (Z-axis) direction. It operates on the principle of Lorentz force actuation: an electromagnetic coil interacts with a permanent magnetic field to generate highly reproducible, broadband mechanical motion. With a rated thrust of 1.98 kN and a frequency bandwidth spanning 5 Hz to 5000 Hz, the shaker delivers high-fidelity acceleration profiles across low-frequency structural resonance characterization and high-frequency component fatigue assessment. Its rigid, low-resonance base frame and optimized armature suspension ensure minimal phase distortion and excellent transmissibility up to 10 g peak acceleration—enabling accurate simulation of real-world transport, operational, and environmental vibration stressors per internationally recognized test standards.

Key Features

• Electrodynamic linear actuator architecture with water-cooled voice coil and rare-earth magnet assembly for thermal stability and long-term output consistency
• Digital closed-loop control system featuring real-time acceleration feedback via integrated IEPE accelerometer and PID-regulated drive signal correction
• Modular table interface with M8 threaded mounting holes (grid pitch: 50 mm) and optional slip-table or reaction mass extension for enhanced modal isolation
• Compliance with ISO 10816-1 (vibration severity evaluation), ISO 5347 (transducer calibration), and IEC 60068-2-64 (broadband random vibration)
• Integrated safety interlocks including over-temperature cut-off, over-acceleration limiter, and emergency stop circuit compliant with EN 60204-1
• Front-panel LCD with encoder-based navigation and USB/RS-232 connectivity for remote operation and firmware updates

Sample Compatibility & Compliance

The OK-ES-3.0011 accommodates test specimens up to 70 kg mass with dimensional constraints defined by its 300 × 300 mm active surface and 30 mm vertical stroke clearance. It supports rigid mounting of printed circuit board assemblies, automotive ECUs, aerospace avionics enclosures, and consumer electronics housings using standard fixture plates or custom-designed adapters. All test protocols align with regulatory and industry-standard requirements—including MIL-STD-810H Method 514.8 (vibration), ASTM D4728 (random vibration of shipping containers), and USP (analytical instrument qualification for vibration-sensitive lab equipment). The system’s traceable calibration certificate (NIST-traceable reference accelerometers) satisfies GLP/GMP documentation requirements for pharmaceutical and medical device validation.

Software & Data Management

OK-VibControl v3.x is the dedicated control and analysis suite, providing full waveform generation (sine, swept-sine, random, transient, sine-on-random), real-time spectrum monitoring (FFT up to 8192 lines), and post-test metrics including PSD (power spectral density), kurtosis, crest factor, and fatigue damage spectrum (FDS). The software enforces FDA 21 CFR Part 11 compliance through role-based access control, electronic signatures, immutable audit trails, and encrypted data storage. Export formats include CSV, UFF58, and MATLAB-compatible .mat files. Optional integration with LabVIEW™ and Python APIs enables automated test sequencing within larger QA/QC workflows.

Applications

• Early-life failure detection (infant mortality screening) in electronic subassemblies under accelerated vibration stress
• Structural integrity verification of welded chassis, cast housings, and bolted joints under resonant sweep excitation
• Transport simulation per ISTA 3A (parcel delivery) and ASTM D4169 (unitized loads) for packaging validation
• Modal parameter identification (natural frequencies, damping ratios, mode shapes) via impact hammer + shaker excitation hybrid testing
• Qualification of inertial sensors, MEMS devices, and optical alignment mounts against micro-vibration sensitivity thresholds
• Environmental stress screening (ESS) in accordance with GEIA-STD-0004 and Telcordia GR-63-CORE

FAQ

What is the maximum allowable payload when operating at 5000 Hz?
At 5000 Hz, the shaker’s mechanical power limit restricts the maximum payload to ≤12 kg to maintain linearity and avoid armature saturation. A full payload derating curve is provided in the operator manual.
Does the system support multi-axis vibration testing?
The OK-ES-3.0011 is a single-axis (vertical Z-axis) shaker. For triaxial testing, OK Instruments offers synchronized multi-shaker configurations (e.g., OK-ES-3.0011 ×3 with master-slave controller) requiring separate quotation.
Is third-party calibration certification included with purchase?
Yes—each unit ships with a factory calibration report traceable to NIST standards, valid for 12 months. Optional annual recalibration services with accredited laboratory certification are available.
Can the controller perform closed-loop control using an external accelerometer?
Yes. The system accepts IEPE-type accelerometers via its auxiliary analog input channel, enabling user-defined control points distinct from the built-in table-mounted sensor.
What documentation is supplied for regulatory audits?
Complete IQ/OQ documentation templates, risk assessment matrices (per ISO 14971), and validation protocol examples are included. All software logs meet ALCOA+ data integrity principles.