The 0.030 inches requirement is double amplitude (peak-to-peak). If you mistake this for 0.030 inches peak, you will under-test by 50%. Your shaker displacement will be half of what is required.
Place control accelerometers on the mounting points. Place response accelerometers on heavy internal components (transformers, contactors, PCBs). mil-std-167-2a pdf
The answer is for naval procurement. Here is the difference: Place control accelerometers on the mounting points
Introduction: Why MIL-STD-167-2A Matters In the world of naval engineering and defense contracting, standards are not just suggestions—they are the backbone of system reliability. For equipment destined for U.S. Navy ships and submarines, one of the most referenced—and most misunderstood—documents is MIL-STD-167-2A . shipboard vibration testing
| Feature | MIL-STD-167-2A | MIL-STD-810H (Method 514) | | :--- | :--- | :--- | | | Navy Shipboard (Surface & Submarine) | General Military (Ground, Air, Sea) | | Frequency Range | 2 Hz to 50 Hz (often extended to 200 Hz) | 5 Hz to 500 Hz+ | | Duration | 2 hours per axis (Typically) | 1 hour per axis (Typical) | | Key Focus | Low-frequency, high-displacement vibration from hull flex | Broadband transport and operational vibration | | Contractual Use | Mandatory for Navy shipboard equipment | Optional unless specified by Navy |
Searching for a "mil-std-167-2a pdf" is the first step for many mechanical engineers, test technicians, and procurement specialists. However, simply finding the PDF is not enough. You need to understand its scope, how it differs from other vibration standards (like MIL-STD-810), and how to correctly apply its test procedures.
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