FreqCheck: See Sound/Vibration

What's New in Version 4.0.5 IEC Frequency Weighting & SLM Integration FreqCheck expands into a comprehensive, IEC 61672-compliant Sound Level Meter (SLM) for defense, occupational, and industrial testing. Standard Acoustic Lenses: Toggle between Z-Flat (unweighted linear response from 0.2 Hz to 192 kHz), A-Weighted (OSHA/environmental noise), and C-Weighted (industrial peak compliance and low-frequency rumble) inside Pro Input Mode (PIM). Time Integration & MIL-STD-1474E Safeguard: Apply standard Fast (125ms) or Slow (1000ms) RMS time-averaging for continuous noise monitoring. Critical MIL-STD-1474E Protocol: For ballistic shockwave and suppressor testing, always set Frequency Weighting to Z-Flat (Unweighted) and lock the clock to 192.0 kHz or 384.0 kHz to capture true microsecond Peak SPL (Lpk). Applying A-Weighting or relying on Fast/Slow RMS averaging during gunfire tests will artificially attenuate shockwave rise times and underreport blast overpressure. Protected Metrology: To maintain Class 1 integrity, active Weighting and Time Integration selections are permanently stamped onto Layer 1 of every SHA-256 PDF Audit Report, ensuring complete transparency between raw ballistic captures and filtered metrics. Full Post-Process Parity (Import Audio & Video Like Live Hardware) Every advanced capability inside Pro Input Mode (PIM)—including IEC Frequency Weighting (Z, A, C), Time Integration, WideBand 65k-point FFT resolution, and Dynamic Pulse Sequence (DPS) blast analysis—now executes with 100% mathematical parity on imported Audio (.wav, .flac, .alac, .aiff, .m4a, .mp3 up to 24-bit/384 kHz) and Video files. Configure your exact PIM sensor calibration, weighting, or MIL-STD-1474E parameters and audit pre-recorded range captures or dormant lab archives just like a live DAQ feed. Raw 384.0 kHz Hardware Integration & 65k-Point FFT Unlocks 384.0 kHz sampling for 192.0 kHz WideBand acoustic auditing. Powered by a dynamic 65,536-point FFT architecture, the engine delivers enterprise spectral resolution at maximum clock speeds with live digital SPL readouts and Peak Hold captures. Dynamic Pulse Sequence (DPS) & MIL-STD-1474E Blast Averaging Calculates true energetic logarithmic averages (Lavg) and instantaneous Peak SPL (Lpk) across multi-round strings per MIL-STD-1474E, ISO 10843, and ANSI S12.19. Configurable pulse counts (3–10), threshold gates (>130 dB), and anti-echo lockout windows (0.5–3.0s) aggregate into a unified report featuring max peak levels, energetic means, per-shot breakdowns, and a SHA-256 sequence hash. Pro Input Mode (PIM) Bridging & Hardware DC Block PIM grants direct control over channel routing, ADC voltage ceilings, sensor sensitivity (mV/Pa or mV/g), and dual preset slots—bypassing iOS filters to bridge DC-coupled DAQs and instrumentation mics. A switchable Hardware DC Block eliminates electrical DC offsets while strictly preserving 0.2 Hz infrasound. Forensic-Grade Cryptographic Proof Sessions conclude with an ISO/IEC 17025-calibrated, NIST-traceable PDF Audit Report secured by device-hash anchoring and real-time SHA-256 cryptographic sealing for evidentiary-weight documentation.