MP30 Series
IEPE microphone set MP30 consisting of a ½” microphone capsule with preamplifier can be connected to all measuring devices with IEPE sensor supply.
MP30 is a class 1 measurement microphone according to the WS2F frequency response industry standard.
The low noise floor of less than 16 dB(A) and the linear frequency response of 4 Hz to 20 kHz is ideally suited for almost any precision measurement.
MP30 Set
- Price: 854 €
½” Free Field Microphone
- Class 1 and WS2F according to IEC 61094-4
- Sensitivity 40mV/Pa
- IEPE constant current supply 2-20 mA | Bias: 12.5 Volt
- Polar Pattern: Omnidirectional
- Frequency Response: 4 Hz – 20 kHz
- Acoustic noise floor 16 dB A-weighted
- Measuring range 16 dB(A) to SPL Peak (3% Dist.) 135 dB
Scope of delivery:
- ½” microphone capsule pre-polarized
- ½” IEPE microphone preamplifier
MP30 Microphone Capsule | IEC 61094-4 Type WS2F |
|---|---|
Diameter | 1/2″ |
Frequency Range | 4 Hz ~ 10 Hz ± 1.5 dB 10 Hz ~ 4 kHz ± 0.5 dB 4 kHz ~ 20 kHz ± 2.5 dB |
Responce Type | Free field |
Electrode Forming Voltage | 0 V |
Sensitivity (dB re 20 μPa) | 40 mV/Pa (± 1.5 dB) |
Capacitance at 250 Hz | 18 pF |
SPL Max. at 250 Hz Distortion <3% | 135 dB |
Intrinsinc Noise Level | 16 dB (A) |
Operating Temperature Range | -20 °C ～ +60 °C |
Operating Humidity Range | 25 % ～ 90 %(RH) |
Temperature Characteristics | 0.01 dB/C° Maximum |
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 |
Outer Dimensions | Ф 13.2 mm x 16.0 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 |
MP30-50 Set
- Price: 954 €
Class 1 ½” Free Field Microphone
- Class 1 and WS2F according to IEC 61094-4
- Sensitivity 50 mV/Pa
- IEPE constant current supply 2-20 mA | Bias: 12.5 Volt
- Polar Pattern: Omnidirectional
- Frequency Response: 4 Hz – 20 kHz
- Acoustic noise floor 16 dB A-weighted
- Measuring range 16 dB(A) to SPL Peak (3% Dist.) 135 dB
Scope of delivery:
- ½” microphone capsule pre-polarized
- ½” IEPE microphone preamplifier
MP30-50 Microphone Capsule | IEC 61094-4 Type WS2F |
|---|---|
Diameter | 1/2″ |
Frequency Range | 4 Hz ~ 10 Hz ± 1.5 dB 10 Hz ~ 4 kHz ± 0.5 dB 4 kHz ~ 20 kHz ± 2.5 dB |
Responce Type | Free field |
Electrode Forming Voltage | 0 V |
Sensitivity (dB re 20 μPa) | 50 mV/Pa (± 1.5 dB) |
Capacitance at 250 Hz | 18 pF |
SPL Max. at 250 Hz Distortion <3% | 135 dB |
Intrinsinc Noise Level | 16 dB (A) |
Operating Temperature Range | -20 °C ～ +60 °C |
Operating Humidity Range | 25 % ～ 90 %(RH) |
Temperature Characteristics | 0.01 dB/C° Maximum |
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 |
Outer Dimensions | Ф 13.2 mm x 16.0 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 |
Class 1 – 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
MP30-Ultra
- Price: 1715 €
Ultrasound Microphone Set
The 1/4” measuring microphone capsule MK 301 E is designed for acoustic measurements in research, development and industry and is also used in building acoustics and audiometry, among other things.
- WS3F according to IEC 61094-4
- Frequency response 5 Hz to 100 kHz with MP30 microphone amplifier
- Sensitivity 3,5 mV/ Pa
- IEPE Constant Current Power 4 – 20 mA / 18V – 30V
- Free Field
- Sound pressure level up to 168 dB
- Range 35dBA to 168dB
- Pre-polarized
The measuring microphone capsule MK 301 is suitable for class 1 sound level meters according to IEC 61672.
A typical 1/2″ measuring microphone delivers a voltage of 50 mV at 1 Pascal.
1 Pascal corresponds to 94 dB sound pressure level. 94 dB is already very unpleasant for humans and is only tolerated in rare situations.
In a normal conversation, the sound pressure level is below 74 dB, i.e. 20 dB lower. 20 dB quieter is a factor of 10 quieter.
This means that at 74 dB, the microphone only delivers 5 mV.
Assuming that parts are acoustically tested in a soundproof measuring chamber during the end-of-line test, it can be assumed that the measuring microphone only delivers a few microvolts.
Therefore, the choice of the input measuring range of the measurement data acquisition is very important. Assuming that the measuring card has a measuring range of 10,000 mV and the measuring microphone is exposed to a sound pressure level of 74 dB, which delivers 5 mV, then the measuring range of 10 volts is far too coarse for this application.
Our solution for this application is the PnDL-100 with an input measuring range of 100 mV, which provides an acoustic measuring range of 13 to 97 dB(A).
Ultrasound Microphone with MP48 ZOOM UAC 232 and CA111
Two-channel ultrasonic measurement using MP30-Ultra ultrasonic microphones, MP48 IEPE XLR adapter, ZOOM UAC-232 audio converter, CA111 microphone calibrator and NVH FFT software.
The whole measurement chain was calibrated with the microphone calibrator.
In the following, I would like to present the self-noise of four microphone models, including two 1/2‘ microphones and two 1/4’ microphones.
Following microphones were used for the measurements:
