Designed to measure the sound pressure in the sound field, compensating for the influence of the presence of the microphone in the sound field. The microphone measures the sound pressure as it existed before the microphone was introduced in the sound field, i.e. free-field conditions.
Designed to measure the sound pressure in the sound field, compensating for the influence of the presence of the microphone in the sound field. In effect, the microphone measures the sound pressure as it existed before the microphone was introduced in the sound field, i.e. free-field conditions. The free field microphone should be pointed towards the sound source at a 0° angle of incidence.
These free-field microphones are designed to measure sound as it exists in an open, unobstructed environment — that is, a free field where there are no nearby reflective surfaces that could affect the sound. These microphones are calibrated to account for the way sound waves behave when they directly strike the microphone diaphragm without any interference from surrounding objects.
Norsonic Microphones and Preamplifiers
Frequency Response: (18 pF/small signal): 20 Hz ¬– 20 kHz: ±0,1 dB
Gain: Typ -0.1 dB (-0.2 with 20 pF)
Input Impedance: 10 GΩ, 1.4 pF
Output Impedance: 50 ohm typical
Noise (20 pF dummy mic.):
i. A-weighted < 2,2μV (typ 1,8μV)
ii. Lin (20 Hz – 20 kHz) <6 μV (typ 3,8 μV)
Power Supply:
i. Single: 28 V (1mA) to 120 V (2.8mA)
ii. Dual: ±14 V(1 mA) to ± 60 V (2.8 mA)
iii. Maximum signal output voltage (peak): ±10 to ±50 V (dep. on supply)
Temperature: -25°C to +70°C (operation)
Relative Humidity: 0 – 90%
Length: 83 mm
Body Diameter: 12.7 mm
Ring Diameter: 14 mm
Weight: 36 g
EC Classification: As for sound level meter Nor140.
Cartridge size: 1/2” inch
Main standard: IEC 61672 Class 1
Polarisation voltage: 0 volt
IEC 61094-4 Designation: WS2F
Nominal sensitivity: 50 mV/Pa
Frequency response: ±1dB 5 Hz – 10k Hz, ±3 dB 3,15 Hz – 20 kHz
Maximum SPL (3% dist): 146 dB re. 20µPa
Self noise: 15 dB(A)
Capacitance: 14 pF
Temperature coeff. (250 Hz): <0.005 dB°C
Max. temperature: 120 °C
Static pressure coeff. (250 Hz): -0.008 dB/kPa
Relative humidity coeff. (no condens.): Not measurable dB/%
Diameter: 13.2 mm
Length: 16.2 mm
Weight: 6 g
Cartridge Size: 1/2″
Design: IEC 61094-4 Type WS2F
Frequency Response: Free-field type
Sensitivity Level (nominal value):
−26 dB (re. 1 V/Pa at 1 kHz) / 50 mV/Pa
Cartridge Capacitance (nominal value): 13 pF
Frequency Range: 10 Hz to 20 kHz
Maximum Input Sound Pressure Level:
148 dBrms @ 3% distortion
Inherent Noise (A-weighted equivalent sound pressure level): <16 dB
Temperature Sensitivity (ref to 23°C @ 1 kHz):
<±0.35dB (−10°C to +50°C)
<±0.5dB (−20°C to +60°C)
Humidity (ref 23°C , 50% RH): < ±0.14 dB max. (at 1 kHz, no condensation, 90% RH or less)
Atmospheric Pressure Sensitivity (ref 101.325 kPa @ 250 Hz):
<±0.4 dB from 85 kPa to 108 kPa
<±0.9 dB from 65 kPa to 85 kPa
Ambient Temperature/Humidity Range for Operation:
20°C to +60°C, 90% RH (no condensation)
Ambient Temperature Range for Storage:
−20°C to +60°C
Dimensions (with protection grid):
13.2 mm dia. × 14.3 mm height
Preamplifier Threads: 11.7 mm 60 UNS
Weight: 4.7 g
Rion Microphones and Preamplifiers
Frequency Response: 20 Hz ¬– 100 kHz
Bias Voltage: 200 V
Sensitivity Level: (dB re 1/Pa): -47
Capacitance (pF): 6
Maximum Input Sound Pressure Level (dB): 164 *Distortion rate 3%
A-weighted Inherent Noise (dB): 42
Temperature Coefficient (dB/°C): -0.01
Diaphragm: Titanium
Dimensions (mm): 7.0 (dial) x 10.0
Suggested Preamplifier: NH-05B
Frequency Response: 10 Hz ¬– 20 kHz
Bias Voltage: 200 V
Sensitivity Level (dB re 1/Pa): -25.5
Capacitance (pF): 17
Maximum Input Sound Pressure Level (dB): 144 *Distortion rate 3%
A-weighted Inherent Noise (dB): 20
Temperature Coefficient (dB/°C): -0.007
Diaphragm: Titanium Alloy
Dimensions (mm): 13.2 (dial) x15
Suggested Preamplifier: NH-04B/-5B/12A
Frequency Response: 10 Hz ¬– 35 kHz
Bias Voltage: 200 V
Sensitivity Level (dB re 1/Pa): -37
Capacitance (pF): 20
Maximum Input Sound Pressure Level (dB): 160 *Distortion rate 3%
A-weighted Inherent Noise (dB): 26
Temperature Coefficient (dB/°C): -0.007
Diaphragm: Titanium Alloy
Dimensions (mm): 13.2 (dial) x13.2
Suggested Preamplifier: NH-04B/-5B/12A
Frequency Response: 10 Hz ¬– 12.5 kHz
Bias Voltage: 0 V
Sensitivity Level (dB re 1/Pa): 0
Capacitance (pF): –
Maximum Input Sound Pressure Level (dB): 96 *Distortion rate 3%
A-weighted inherent noise (dB): 4
Temperature Coefficient (dB/°C): –
Diaphragm: Titanium Alloy
Dimensions (mm): 23.8 (dial) x 132.7
Suggested Preamplifier: NH-17/17A/21/22A
Frequency Response: 20 Hz ¬– 8 kHz
Bias Voltage: 0 V
Sensitivity Level (dB re 1/Pa): -33
Capacitance (pF): 13
Maximum Input Sound Pressure Level (dB): 148 *Distortion rate 3%
A-weighted Inherent Noise (dB): 24
Temperature Coefficient (dB/°C): -.008
Diaphragm: Titanium Alloy
Dimensions (mm): 13.2 (dial) x12.0
Suggested Preamplifier: NH-17/17A/22A/24*
*UC-52 and NH-24 are the most common microphone and preamplifier set for Rion Class 2 Meters
Frequency Response: 10 Hz ¬– 20 kHz
Bias Voltage: 0 V
Sensitivity Level (dB re 1/Pa): -27
Capacitance (pF): 13
Maximum Input Sound Pressure Level (dB): 148 *Distortion rate 3%
A-weighted Inherent Noise (dB): 18
Temperature Coefficient (dB/°C): <±0.35 dB (at 1 kHz)
Diaphragm: Titanium Alloy
Dimensions (mm): 13.2 (dial) x14.3
Compatible Preamplifier: NH-17/17A/22A/25*
*UC-59 and NH-25 are the most common microphone and preamplifier set for Rion Class 1 Meters
Frequency Response: 10 Hz ¬– 100 kHz
Bias Voltage: 200 V
Input Impedance (GΩ): 10
Capacitance (pF): 0.2
Gain (dB): -0.5 (6pF) (UC-29*)
A-weighted Inherent Noise (dB): 42 (UC-29)
Output Impedance: ≤ 100
Cable Type: EC-04 series (7p)
*The UA-12 Conversion Adapter enables 1/4″ Rion microphones to connect seamlessly to 1/2″ preamplifiers while maintaining full calibration accuracy and connection integrity. This compact yet essential accessory broadens your measurement capabilities by allowing the use of smaller 1/4″ microphones in standard 1/2″ setups.
Frequency response: 10 Hz ¬– 100 kHz
Bias Voltage: 200 V
Input Impedance (GΩ): 3
Capacitance (pF): 0.25
Gain (dB): -0.2 (17pF) (UC-30)
A-weighted Inherent Noise (dB): 20 (UC-30)
Output Impedance: ≤ 100
Cable Type: EC-04 series (7p)
*The UA-12 Conversion Adapter enables 1/4″ Rion microphones to connect seamlessly to 1/2″ preamplifiers while maintaining full calibration accuracy and connection integrity. This compact yet essential accessory broadens your measurement capabilities by allowing the use of smaller 1/4″ microphones in standard 1/2″ setups.
Frequency Response: 10 Hz ¬– 100 kHz
Bias Voltage: 200 V
Input Impedance (GΩ): 3
Capacitance (pF): 0.25
Gain (dB): -0.2 (17pF) (UC-30)
A-weighted Inherent Noise (dB): 20 (UC-30)
Output Impedance: ≤ 100
Cable Type: 1.5m integrated (7p)
*The UA-12 Conversion Adapter enables 1/4″ Rion microphones to connect seamlessly to 1/2″ preamplifiers while maintaining full calibration accuracy and connection integrity. This compact yet essential accessory broadens your measurement capabilities by allowing the use of smaller 1/4″ microphones in standard 1/2″ setups.
Frequency Response: 10 Hz ¬– 100 kHz
Bias Voltage: 0 V
Input Impedance (GΩ): 3
Capacitance (pF): 0.8
Gain (dB): -0.5 (13pF) (UC-59)
A-weighted Inherent Noise (dB): 18 (UC-59)
Output Impedance: ≤ 300
Cable Type:
NH-17: 5m integrated (7p)
NH-17A: EC-04 series (7p)
*The UA-12 Conversion Adapter enables 1/4″ Rion microphones to connect seamlessly to 1/2″ preamplifiers while maintaining full calibration accuracy and connection integrity. This compact yet essential accessory broadens your measurement capabilities by allowing the use of smaller 1/4″ microphones in standard 1/2″ setups.
Frequency Response: 10 Hz ¬– 100 kHz
Bias Voltage: 0 V
Input Impedance (GΩ): 6
Capacitance (pF): 0.7
Gain (dB): -0.5 (13pF) (UC-59)
A-weighted Inherent Noise (dB): 18 (UC-59)
Output Impedance: Approx. 30
Cable Type: EC-90 series (BNC)
*The UA-12 Conversion Adapter enables 1/4″ Rion microphones to connect seamlessly to 1/2″ preamplifiers while maintaining full calibration accuracy and connection integrity. This compact yet essential accessory broadens your measurement capabilities by allowing the use of smaller 1/4″ microphones in standard 1/2″ setups.
