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Infrasound Microphone WS2F

The 1/2″ measurement microphone MP30-Infra makes it possible to use a high-quality, pre-polarized measurement microphone capsule MK 222 E on measurement systems with IEPE supply. Typical applications include low-frequency measurements.
 
The MP30 preamplifier is designed with a frequency response of 0.1 Hz to 200 kHz and can be fitted with a microphone capsule suitable for the application.
 
The MI-MKAL microphone holder is recommended for mounting the microphone. The use of 1/2″ measuring microphone capsule accessories, such as windscreens etc., is possible without any problems.
 
The measuring microphone can be calibrated with the sound calibrator 4010, CA 111 or with other suitable sound pressure calibrators.
 

MP30-Infra

Infrasound Measurement Microphone

WS2F – DIN IEC 61094-4

  • Sensitivity 50 mv/Pa
  • IEPE constant current supply 2-20 mA
  • Directional characteristic: omnidirectional
  • Frequency response: 0.5 Hz – 20 kHz (± 2 dB)
  • 0.5 Hz – 3.5 Hz: ± 2 dB
  • 3.5 Hz – 4 kHz: ± 0.5 dB
  • 4 kHz – 20 kHz: ± 2 dB
  • Acoustic noise floor 15 dB A-weighted
  • Measuring range 15 dB(A) to SPL peak (5% dist.) 135 dB
Class 1 Infrasound Microphone
MK 222 E Microphone Capsule
IEC 61094-4 Type WS2F
Diameter
1/2″
Frequency Range
0.5 Hz ~ 20 kHz (±2 dB)
Responce Type
Free field
Electrode Forming Voltage
0 V
Sensitivity (dB re 20 μPa)
50mV/Pa (±1.5dB)
Capacitance at 250 Hz
18 pF
Maximum Sound Pressure Level
135 dB
Intrinsinc Noise Level
15 dB (A)
Operating Temperature Range
10℃~+ 50℃
Operating Humidity Range
up to 70 °C, 90 %
Temperature Characteristics
< 0.015 dB/°C
Humidity Characteristics
0.001 %(RH)
Aging Drift
0.2 dB/Year
Storage Temperature Range
-20 °C ~ +60 °C
Storage Humidity Range
25 % ~ 90 %(RH)
Venting
rear vented
Outer Dimensions
Ф 13.2 mm x 10.9 mm
Weight
8.3 gram
MP30
Preamplifier
Frequency Response (re. 250 Hz)
0.1 Hz ~ 10 Hz ± 3 dB
10 Hz ~ 20 kHz ± 0.1 dB
10 Hz ~ 200 kHz ± 0.2 dB
Gain
0.04 dB
Intrinsic Noise
(20Hz ~ 20kHz)
< 5 μV A-weighting
Distortion (THD) @1kHz 1 V
< 0.1%
Output Impedance
<50Ω
Max. Output Voltage
6.5 Volt RMS @ 21 Volt IEPE DC Offset
IEPE Power Voltage
18 V ~ 30 V | Bias : 12.5 Volt
IEPE Current
2 mA ~ 20 mA
Polarization Voltage
0 V
Dimensions
Ф 12.7mm × 70 mm
Weight
< 20 g (cable not included)
Operating Temperature
– 20°C ~ + 60°C
Humidity
25 %~ 90 %(RH)
Atmospheric Pressure
65 kPa~108 kPa
Connector Type
BNC
Thread for Microphone
Capsule Mounting
11.7 mm-60 UNS

USB Infrasound Microphone

The iSV1611 digital USB microphone preamplifier is suitable for all common pre-polarized 1/2” microphone capsules.

The thread type 60 UNS allows the combination of different microphone capsule manufacturers depending on the application.

WS2F – IEC 61094-4

The 1/2”  infrasound microphone capsule is designed for acoustic measurements in research, development and industry and is also used in building acoustics and audiology, among other things.

  • Frequency range 1 Hz to 20 kHz
  • Free Field
  • Measuring range 15 dB(A) to 135 dB

The microphone capsule has a fixed charge carrier layer (backelectret) to provide the polarization voltage.

The careful construction and the constructive concept of the microphone capsules guarantee a high temporal constancy of the electro-acoustic parameters.

The internationally common thread type (60 UNS) for connecting the microphone capsule allows interchangeability with other 1/2” microphone capsules and enables connection to all suitable calibration and measuring devices.

Class 1 Infrasound Microphone
USB Infrasound Microphone
MK 222 E Microphone Capsule
IEC 61094-4 Type WS2F
Diameter
1/2″
Frequency Range
0.5 Hz ~ 20 kHz (±2 dB)
Responce Type
Free field
Electrode Forming Voltage
0 V
Sensitivity (dB re 20 μPa)
50mV/Pa (±1.5dB)
Capacitance at 250 Hz
18 pF
Maximum Sound Pressure Level
135 dB
Intrinsinc Noise Level
15 dB (A)
Operating Temperature Range
10℃~+ 50℃
Operating Humidity Range
up to 70 °C, 90 %
Temperature Characteristics
< 0.015 dB/°C
Humidity Characteristics
0.001 %(RH)
Aging Drift
0.2 dB/Year
Storage Temperature Range
-20 °C ~ +60 °C
Storage Humidity Range
25 % ~ 90 %(RH)
Venting
rear vented
Outer Dimensions
Ф 13.2 mm x 10.9 mm
Weight
8.3 gram
iSV1611
USB Microphone
Preamplifier
Signal Amplitude ref. 50mV @ 1kHz
Frequency Response
Frequency Sampling 192 kHz
1 Hz~20Hz, Error <3.0dB
20 Hz~20kHz, Error<0.3dB
20 kHz~80kHz, Error<3dB
Electrical signal
noise background
Ch.1 (<13dBA, <26dBZ)
Ch.2 (<50dBA, <63dBZ)
THD Input 1kHz, 50mV, A weighting
<0.1%
Overload Indicator
1kHz (THD<3%)
Ch.1 (>101.9dB)
Ch.2 (>140dB)
Amplitude accuracy
Input 31.6mV, 1kHz, 90.0dB
Error <0.2dB
Dimensions
1/2″ Outer diameter
of protector cover
Ф 20 × 165 mm
φ 13.2mm
Weight
<96 g (cable not included)
Operating Temperature
-20°C ~ + 60°C
Humidity
25 %~ 90 %(RH)
Atmospheric Pressure
65 kPa~108 kPa
Connector Type
USB2.0,
Microphone Thread
11.7 mm-60 UNS