Measurement microphones MI15, MI17, MI19, RG-50, and MI21 are 1/4″ types of free-field microphones with integrated electronics that are commonly used in scientific research.
To ensure accuracy, these microphones can be supplied with close tolerances of ±0.5dB and have transfer factors ranging from 10 mV/Pa to 100 mV/Pa.
Constant current power IEPE is the standard power source, usually set at 4mA.
Coaxial cables are used as feed lines, and the standard microphone configuration includes BNC connectors that have optional TNC variations available.
10 volt measuring range, sound pressure level and microphone sensitivity.
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).
1/4″ measurement microphone
50mV/Pa
Class 1 – IEC 61672
Free field
20Hz to 30kHz
30dBA to 130dB
Price: 325 €
1/4″ measurement microphone
Infrasound to Ultrasound
Class 1 – IEC 61094-5
Free field
5 Hz to 30kHz
27dBA to 130dB
Price: 588 €
1/4″ measurement microphone
IP55 Splash proof
Class 1 – IEC 61094-5
Free field
20Hz to 20kHz
27dBA to 130dB
Price: 618 €
MP30 set + MK 301 E
40mV/Pa and 3.5mV/Pa
Class 1 – WS3F – IEC 61094-4
Free field
5Hz to 100kHz
18dBA to 168dB
Model | Description | Price |
|---|---|---|
 | ROGA Instruments products are free from planned obsolescence, technically accessible, durable and repairable. | |
POM-MI1921 | MI19 and MI21 microphone sleeve adapter from 1/4″ inner diameter to 1/2″ outer diameter. POM material to ensure galvanic isolation to prevent ground and earth loops | 24 € |
POM-MI17RG50 | MI17 and RG-50 microphone sleeve adapter to 1/2″ outer diameter. POM material to ensure galvanic isolation to prevent ground and ground loops | 24 € |
MicCAL | Microphone Calibration Fee for ROGA Instruments microphones MI15 | MI17 | MI18 | MI19 | MI21| RG-50 | RG-50HL| MP30| MP40 After successful factory calibration, the microphone is returned to the customer with our factory calibration certificate. | 155 € |
MicREP | Microphone Repair Fee for ROGA Instruments microphones MI15 | MI17 | MI18 | MI19 | MI21| RG-50 After successful repair and factory calibration, the microphone is returned to the customer with our factory calibration certificate. | 225 € |
WS-RG-40 | 1/4″ microphone windscreen Ø 40 mm | 38 € |
MI19 | ¼” IEPE microphone for industrial applications Sensitivity 50 mV/Pa Constant current supply 2-8 mA BNC connector Polar pattern: omnidirectional Class 1 frequency response in accordance with IEC 61672 20 Hz – 30 kHz calibration sheet included Sensitivity & Frequency Response Inherent noise 30 dBA SPL Max 130 dB HS Code 85181000 | 325 € |
MI19SW | IP55 splash water resistant ¼” IEPE microphone for industrial applications Sensitivity 50 mV/Pa Constant current supply 2-8 mA BNC connector Polar pattern: omnidirectional Class 1 frequency response in accordance with IEC 61672 20 Hz – 30 kHz calibration sheet included Sensitivity & Frequency Response Inherent noise 30 dBA SPL Max 130 dB HS Code 85181000 | 455 € |
RG-50HL | High SPL Microphone e.g. shooting noise WS3F Free-field IEC 61094-5 Total length: 95 mm Sensitivity 14 mV/Pa constant current Supply 2-20 mA BNC connection Polar pattern: omnidirectional Frequency response: 5 Hz – 4 kHz: ± 1 dB 4 kHz – 30 kHz: ± 1.5 dB factory calibration certificate included measuring range up to SPL 144 dBRMS / 150 dB peak HS Code 85181000 | 1275 € |
MK342 E + MV310 Set | 1/4″ microphone with constant pressure frequency response WS3P according to IEC 61094-4 Pressure 3.5Hz to 70kHz 60dB(A) to 186dB pre-polarized HS Code 85181000 | 1480 € |
MI21 | ¼” IEPE condenser microphone Splash Water Proof IP55 Sensitivity 50 mV/Pa / ± 1.0 dB CCP IEPE supply 2-6 mA BNC connector Polar pattern: omnidirectional Frequency response IEC 61094-5 20 Hz – 4 kHz: ± 0.5 dB 4 kHz – 20 kHz: ± 1.5 dB corresponds to class 1 Calibration sheet included Sensitivity & Frequency Response Inherent noise 26 dB(A) SPL Max 130 dB HS Code 85181000 | 618 € |
MI17 | 1/4″ IEPE microphone, Sensitivity 50 mV/Pa, constant current supply 2-8 mA BNC connection Class 1 frequency response in accordance with IEC 61672 20 Hz – 30 kHz free field including individual Calibration sheet (sensitivity & frequency response) Inherent Noise 30 dB (A) HS Code 85181000 | 425 €
|
MI17SW | 1/4″ IEPE microphone Splash Water Proof IP55 Sensitivity 50 mV/Pa, constant current supply 2-8 mA BNC connection Frequency response: 20 Hz – 30 kHz: free field Class 1 frequency response in accordance with IEC 61672 including individual Calibration sheet (sensitivity & frequency response) Inherent Noise 30 dB (A) HS Code 85181000 | 495 €
|
RG-50 | 1/4″ IEPE free field microphone Sensitivity 50 mV/Pa constant current supply 2- 20mA BNC connection Frequency response 5 Hz – 4 kHz: ± 0.5 dB 4 kHz – 30 kHz: ± 1.5 dB free field, corresponds to class 1 IEC 61094-5 including individual Calibration sheet (sensitivity & frequency response) Inherent Noise 26 dB (A) HS Code 85181000 | 588 € |
RG-50SW | 1/4″ IEPE Free-field microphone Sensitivity 50 mV / Pa constant current supply 2- 20mA BNC connection Splash Water Proof IP55 Frequency response 5 Hz – 4 kHz: ± 0.5 dB 4 kHz – 30 kHz: ± 1.5 dB free field, corresponds to class 1 IEC 61094-5 including individual Calibration sheet (sensitivity & frequency response) Inherent Noise 26 dB (A) HS Code 85181000 | 618 € |
