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Measurement Microphones
IEPE Microphones

¼" Microphones for measurement technology
in education, industry, development and research

The ¼” electret microphones MI15, MI17, MI19, RG-50 and MI21 are free-field types with integrated electronics. 

All types can be supplied with close tolerances (±0.5dB) with transfer factors between 25 and 100mV/Pa. 

Power is supplied by a constant current source IEPE (standard) with usually 4mA. 

Coaxial cables are used as feed lines. 

As a standard the microphones are equipped with BNC connectors and are also available with TNC connector.

The microphones should not be exposed to aggressive environmental conditions.

1/4" measuring microphones
heat resistant up to 130°C

Class 1 according to IEC 61672
electret free field measurement microphone

IEPE DAQ microphone for applications in standard industrial environments suitable for all noise measurements above 33 dB to 130 dB.

The MI19 ICP measurement microphone offers a cost-effective solution for acoustic measurements. 

It can be used in combination with any instrument that has an ICP® or constant current power supply. 

The frequency response also corresponds to class 1 specification DIN/IEC 651.

  • Sensitivity 50mV/Pa
  • IEPE supply 2-8mA
  • Polar Pattern: Omnidirectional
  • Frequency Response: 20Hz – 20kHz
  • Class 1 according to DIN EN 60 651
  • Acoustic noise floor 33 dB 
  • Measuring range 33 dB to SPL Peak (5% Dist.) 130 dB
  • Temperature range -10 to +80 °C
  • Heat resistant up to 130 °C

Type

MI15

MI19

RG-50

MI17

MI21
Sensitivity
50 mV/Pa ± 0.5 dB
50 mV/Pa ± 0.5 dB
50 mV/Pa ± 0.5 dB
50 mV/Pa ± 0.5 dB
50 mV/Pa ± 0.5 dB
Frequency response
20Hz – 4kHz ± 0.5dB
4kHz – 20kHz ± 1.5 dB
20Hz – 4kHz ± 0.75dB
4kHz – 20kHz ± 1.75 dB
5Hz – 4kHz ± 0.5dB
4kHz – 20kHz ± 1.5 dB
20Hz – 4kHz ± 0.5dB
4kHz – 20kHz ± 1.5 dB
20Hz – 4kHz ± 0.5dB
4kHz – 20kHz ± 1.5 dB
Inherent noise
(lin: 20Hz-20kHz)
(“A”- weighted)

approx. 30 dB (20 µPa)
approx. 26 dB (20 µPa)

approx. 33 dB (20 µPa)
approx. 29 dB (20 µPa)

approx. 30 dB (20 µPa)
approx. 26 dB (20 µPa)

approx. 30 dB (20 µPa)
approx. 26 dB (20 µPa)

approx. 30 dB (20 µPa)
approx. 26 dB (20 µPa)
SPL Peak (5% Dist.)
130 dB
130 dB
130 dB
130 dB
130 dB
Constant Current
Supply
IEPE
2-8 mA
IEPE
2-8 mA
IEPE
2-20 mA
IEPE
2-8 mA
IEPE
2-8 mA
Internal resistance
50 Ω
50 Ω
50 Ω
50 Ω
50 Ω
Dimensions
Total length

65 mm

84 mm

93 mm

93 mm

84 mm
Tube diameter
7 mm
7 mm
8 mm
8 mm
7 mm
Connector
BNC (Ms/Ni)
BNC (Ms/Ni)
BNC (Ms/Ni)
BNC (Ms/Ni)
BNC (Ms/Ni)
Weight
15 Gram
20 Gram
23 Gram
23 Gram
20 Gram
Material (housing)
stainless steel
1.4305
stainless steel
1.4305
stainless steel
1.4305
stainless steel
1.4305
stainless steel
1.4305
Scope of delivery
Calibration Certificate
Calibration Certificate
WS-RG-40
Windscreen
Calibration Certificate
WS-RG-40
Windscreen
Calibration Certificate
WS-RG-40
Windscreen
Calibration Certificate
WS-RG-40
Windscreen
IP55
Options
WS-RG-30
Windscreen
SW IP55
Splash-Proof
SW IP55
Splash-Proof

1/4 inch microphone prices

Model
Price list for 1/4″ measuring microphones
Euro
+
VAT
ICP® is a registered trademark of PCB Group, inc., Depew, New York
MicCAL
Microphone Calibration Fee for ROGA Instruments microphones
MI15 | MI17 | MI18 | MI19 | MI21| RG-50 | MP30| MP40
After successful factory calibration, the microphone is returned to
the customer with our factory calibration certificate.
Here is an example PDF for download

98 €
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.
Here is an example PDF for download

195 €
MI21
MI21; ¼” electret condenser measurement microphone
for industrial measurement purposes.
Splash Water Proof IP55
Sensitivity 50 mV/Pa / ± 1.0 dB
Constant current supply 2-6 mA
BNC connector
Polar pattern: omnidirectional
Frequency response
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
445 €
MI19
MI19; ¼” electret measurement microphone
for industrial measurement purposes.
Sensitivity 50 mV/Pa
Constant current supply 2-8 mA
BNC connector
Polar pattern: omnidirectional
Frequency response
20 Hz – 4 kHz: ± 0.75 dB
4 kHz – 20 kHz: ± 1.75 dB
calibration sheet included Sensitivity & Frequency Response
Inherent noise 33 dB
SPL Max 130 dB
375 €
MI15
MI15 with short housing length 65mm; ¼“ electret condenser measurement microphone
for industrial measurement purposes.
Sensitivity 50 mV/Pa
Constant current supply 2-6 mA
BNC connector Polar pattern: omnidirectional
Frequency response 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
385 €
MI17
MI 17; 1/4″ ICP microphone,
Sensitivity 50 mV/Pa,
constant current supply 2-8 mA
BNC connection, including WS-RG-40 windscreen.
Frequency response:
20 Hz – 4 kHz: ± 0.5 dB
4 kHz – 20 kHz: ± 1.5 dB
free field, corresponds to class 1
including individual Calibration sheet
(sensitivity & frequency response)
Inherent Noise 26 dB (A)
Download MI17 PDF
425 €
MI17SW
MI 17SW; 1/4″ ICP microphone
Splash Water Proof IP55
Sensitivity 50 mV/Pa,
constant current supply 2-8 mA
BNC connection, including WS-RG-40 windscreen.
Frequency response:
20 Hz – 4 kHz: ± 0.5 dB
4 kHz – 20 kHz: ± 1.5 dB
free field, corresponds to class 1
including individual Calibration sheet
(sensitivity & frequency response)
Inherent Noise 26 dB (A)
Download MI17 PDF
445 €
RG-50
RG-50; 1/4″ IEPE Free-field microphone
Sensitivity 50 mV/Pa
constant current supply 2- 20mA
BNC connection
including WS-RG-40 windscreen
Frequency response
5 Hz – 4 kHz: ± 0.5 dB
4 kHz – 20 kHz: ± 1.5 dB
free field, corresponds to class 1
including individual Calibration
sheet (sensitivity & frequency response)
Inherent Noise 26 dB (A)
Download RG-50 PDF
395 €
RG-50SW
RG-50SW; 1/4″ IEPE Free-field microphone
Sensitivity 50 mV / Pa
constant current supply 2- 20mA
BNC connection
including WS-RG-40 windscreen
Splash Water Proof IP53
Frequency response
5 Hz – 4 kHz: ± 0.5 dB
4 kHz – 20 kHz: ± 1.5 dB
free field, corresponds to class 1
including individual Calibration
sheet (sensitivity & frequency response)
Inherent Noise 26 dB (A)
Download RG-50 PDF
425 €
CA111
Sound calibrator; Conforms to IEC 60942 Class 1
for 1/2 “& 1/4” microphone capsules
with quartz-controlled oscillator
to verify accuracy on IEC 60942
Class 1 sound level meters.
94 dB and 114 dB @ 1000 Hz output level selectable
Download CA1xx PDF
820 €
CA114
Sound pressure calibrator
Conforms to IEC 60942 Class 2
for 1/2 ” & 1/4″ microphone capsules
with quartz-controlled oscillator
to verify accuracy on IEC 60942 Class 2
sound level meters
94 dB @ 1000 Hz output level
Download CA1xx PDF
420 €
MI-MH
Microphone holder for
½ “measurement microphones
RG-50, MI-17, MI-21, MP30, MP40, MM210
49 €
WS-RG-40
1/4″ microphone wind screen 40 mm diameter
11 €
AV-11 is the AS10 & AS11 sucessor
AV11; Directional Microphone
Frequency selective band
for airborne noise and sound source localization
single hand operating
Tunable with -octave bandwidth, 31 Hz – 8 kHz and
additional amplification of 20 dB Incl.
headphone, charger, windscreen,
and case. Weight: 4 kg
Download AV-11 PDF
3300 €
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