PLACID PMP21-1 Class 1 Measurement Microphone Set with Preamplifier PLACID PMP21-1: Free-field Class 1 microphone & preamplifier set The PLACID PMP21-1 is a precision ½″, pre-polarized free-field measurement microphone set, compliant with IEC 61094-4 / WS2F Class 1 standards. :contentReference[oaicite:0]{index=0} Supplied together with its matched **PNP21 preamplifier**, this set is optimized for accurate sound measurement in both laboratory and field conditions. :contentReference[oaicite:1]{index=1} Key Specifications Operating Frequency Range: 20 Hz to 20 kHz :contentReference[oaicite:2]{index=2} Dynamic Range: 16 dBA up to 146 dB (A) :contentReference[oaicite:3]{index=3} Nominal Sensitivity: 50 mV/Pa :contentReference[oaicite:4]{index=4} Operating Temperature Range: –30 °C to +75 °C :contentReference[oaicite:5]{index=5} Humidity Range: 0 % to 90 % RH :contentReference[oaicite:6]{index=6} Weight: 8.9 grams :contentReference[oaicite:7]{index=7} Certification: Individual calibration certificate traceable to ISO/IEC 17025 :contentReference[oaicite:8]{index=8} Applications & Uses The **PMP21-1 set** is a robust, high-fidelity measurement tool widely used for free-field acoustical tasks, both in the lab and in field environments. Acoustic testing in architectural & building measurements Noise assessment of machinery, devices, and environmental sound sources General sound level / spectral measurements with Class 1 accuracy Calibration and verification labs needing traceable, certified sensors Designed for dependable performance, the PMP21-1 is well-suited to acoustical consultants, test labs, R&D teams, and regulatory compliance projects. :contentReference[oaicite:9]{index=9} How It Works The microphone capsule is pre-polarized and delivers signals to the included **PNP21 preamplifier**, providing the necessary low-noise amplification and interface to downstream analysis systems. The set is engineered to maintain stability under varied environmental conditions. :contentReference[oaicite:10]{index=10} Users should calibrate the system before and after critical measurements using a sound calibrator to ensure accuracy. :contentReference[oaicite:11]{index=11} Datasheet Download Datasheet (PDF) Ordering & Support Brand: PLACID Model: PMP21-1 (microphone + preamplifier) Distributor: Placid Asia Request a Quote PLACID PMP21-1, measurement microphone set, Class 1 microphone, free-field microphone, PNP21 preamplifier, acoustic measurement, sound testing, precision microphone, IEC 61094-4, microphone calibration, noise measurement