PLACID PMP25 Random Incidence Microphone
Specifications
Basics
The PMP25 is 1/2” prepolarized diffuse- field measurement microphone. It is for general purpose acoustic measurements, e.g. in diffuse fields and inside vehicles. All the microphones are going through solid environmental testing, which includes high temperature ageing and high humidity ageing.
| MATERIALS | |
| Grid | Copper nickel plating |
| Housing | Stainless Steel |
| Diaphragm | Nickel |
| Back Plate | Stainless Steel |
| Insulator | Crystal Quartz |
| Electret | Teflon |
Connectivity
The PLACID PMP25 microphone requires a standardized 1/2″ BNC preamplifier that does not need to provide polarization.
Uses
The PMP25 is a robust and stable microphone and is being used as an all-round free field
microphone suitable for laboratory as well as field jobs.
Daily usage
PLACID recommends calibration before and after each measurement with a calibrator.
Individual calibration
All PLACID measurement microphones are being calibrated in a controlled laboratory environment using traceable calibration equipment complying with ISO17025 standards.
We recommend that all PLACID measurement microphones are re-calibrated every year to guarantee an optimized usage.
PLACID Traceable Calibration is performed by our qualified staff and under controlled conditions according to the procedures and standards such as ISO17025.
Quality
All PLACID measurement microphone sets are made of high-quality materials that will ensure long stability and durability.
The microphone diaphragm, body, and protection grid are made of high-grade stainless steel, which makes the microphone resistant to physical damage.
PLACID offers 2 years warranty against defective materials and workmanship.
THE TYPICAL FREQUENCY RESPONSE FOR PMP25
Dimension
| DATASHEET PLACID PMP25 | |
| Frequency Response | Diffuse – Field |
| Open Circuit Sensitivity | 50mV/Pa |
| Equivalent Noise Level | < 16 dB(A) |
| T.H.D. | < 3% at 146dB SPL |
| Polarization Voltage | 0 V |
| Capacitance | 16.0 pF |
| Equivalent Air Volume | 230 mm3 at 250 Hz. |
| Diaphragm Resonance Frequency | 14 kHz. |
| Pressure Vent | Rear |
| Operating Temperature Range | -30°C ~ 90°C |
| Temperature Coefficient | -20 ~ 60 °C; Sound Pressure Level Change < -0.003 dB (at 250Hz, at reference temperature 23 °C) |
|
Humidity Coefficient |
20% – 90% RH ; Sound Pressure Level Change < –
0.003 dB (at 250Hz at temperature 40 °C, and reference 50% RH) |
|
Pressure Coefficient |
65 kPa – 108 kPa ; Sound Pressure Level change < –
0.004 dB (at 250 Hz at reference pressure 101 kPa. ) |
| Long-Term stability coefficient | < 0.03 dB/year |
| Ventilation | Back |
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