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PMP20 Class 1 Measurement Microphone

PLACID PMP20 Microphone

The PLACID PMP20 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 1 microphone.

Frequency Range: 20Hz to 40kHz
Dynamic Range: 25 to 155 dB(A)
Nominal Sensitivity: 12mV/Pa

The PMP20 microphone is optimized for free-field measurements.
As all PLACID microphones, the PMP20 comes with an individually calibration certificate.

 

Download PLACID PMP20 Microphone Datasheet

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PLACID PMP20 Microphone

PLACID PMP20 is 1/2” prepolarized free field measurement microphone. It is intended to be used in IEC Class 1 Sound Level Meters, and other noise measurements where Class 1 accuracy is required.

All the microphones are going through solid environmental testing, which includes high temperature ageing and high humidity ageing.

Specification

Basics

The PLACID PMP20 is a high-precision condenser microphone manufactured in compliance with the IEC 61094-4 requirements and classified as a class 1 microphone.

The PMP20 microphone is optimized for free- field measurements. As all PLACID microphones, the PMP20 comes with an individually calibration certificate.

Connectivity

The PLACID PMP20 microphone requires a standardized 1/2″ BNC preamplifier that does not need to provide polarization.

Uses

The PMP20 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 microphones are being calibrated in a controlled laboratory environment using traceable calibration equipment complying with ISO17025 standards.

We recommend that all PLACID 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 microphones 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.

DATASHEET PLACID PMP20 MICROPHONE
Materials
GridCopper
HousingStainless Steel
DiaphragmNickel
Back PlateStainless Steel
InsulatorCrystal Quartz
ElectretTeflon

 

Acoustical Properties
Frequency ResponseFree-field
Open Circuit Sensitivity12mV/Pa ±2dB
Equivalent Noise Level< 25 dB(A)
T.H.D< 3% at 155dB SPL
Polarization Voltage0 V
Capacitance16.0 pF
Equivalent Air Volume230 mm3 at 250 Hz.
Diaphragm Resonance Frequency16 kHz.
Pressure VentRear
Operating Temperature Range-30 C, ~ 90 C
Temperature Coefficient< -0.012 dB/℃ (at 250Hz, -10 ~ 50 °C;)
Humidity Coefficient< 0.1 dB/% (at 250Hz, 0 ~ 98 %RH)
Pressure Coefficient< -0.01 dB/kPa (at 250 Hz, 65 kPa – 108 kPa )
Typical frequency response for PMP20

Pressure to free field correction

when using an electrostatic actuator of PMP20 with Protection Grid

(unit: dB)
Frequency kHz 

 

30º

 

60º

 

90º

 

120º

 

150º

 

180º

1.000.20.10.0-0.1-0.2-0.2-0.1
1.250.30.30.1-0.1-0.2-0.20.0
1.600.40.40.10.0-0.2-0.20.1
2.000.50.50.20.0-0.2-0.20.1
2.500.60.50.20.1-0.3-0.20.1
3.150.80.50.10.0-0.4-0.30.2
4.001.00.80.20.0-0.5-0.6-0.4
5.001.51.20.30.0-0.9-0.9-0.5
6.302.21.90.90.1-0.8-0.8-0.3
8.003.32.71.40.1-0.9-0.9-0.1
10.004.63.91.9-0.2-1.7-1.6-0.4
12.506.55.73.40.7-1.0-0.80.7
16.008.06.73.4-0.5-3.0-2.5-1.0
20.009.07.22.5-2.7-5.8-5.5-3.5
Dimensions
 

Dimensions

 

d1

 

d2

 

l1

 

l2

 

d4

 

d5

 

d3

 

Total L

IEC 61094-4

Requirements

for WS2F

 

13.2

 

12.7

 

3.6-4.6

 

>2.2

 

3-5

 

>7.8

11.70-

60UNS-2B

 

N/A

 

PMP20

 

13.20

 

12.68

 

4.30

 

4.30

 

3.01

 

7.90

11.70-

60UNS-2B

 

12.50

 

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