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Owner's Manual for NTi Audio models including: M2230, M2340, M2211, M2215, M4261, M2230-WP, M2340-WP, M2230 Class 1 Measurement Microphone, M2230, Class 1 Measurement Microphone, Measurement Microphone, Microphone
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DocumentDocumentSpecifications Technical Data Measurement Microphones M2230 M2340 (with self-test) M2211 M2215 (high levels) M4261 Classification with XL2 according to IEC 61672, ANSI S1.4 Class 1 Certified Class 1 Frequency Response Class 1 Class 2 Consisting of PreAmplfier MA220 + MC230 or MC230A Capsule PreAmplfier MA230 + MC230A Capsule PreAmplfier MA220 + Capsule 7052 PreAmplfier MA220 + Capsule 7056 M4261 microphone with permanently installed capsule Microphone Type Omnidirectional, pre-polarized condenser, free field microphone Capsule / Transducer 1/2" detachable with 60UNS2 thread, type WS2F according IEC 61094-4 1/4" permanently installed PreAmplifier Type MA220 MA230 MA220 - System Self-test (CIC) - with XL2 - Flatness tolerance bands typical ±1 dB @ 5 Hz - 20 Hz ±1 dB @ >20 Hz - 4 kHz ±1.5 dB @ >4 kHz - 10 kHz ±2 dB @ >10 kHz - 16 kHz ±3 dB @ >16 kHz - 20 kHz +1/-4.5 dB @ 5 Hz - 20 Hz ±1.5 dB @ >20 Hz - 4 kHz ±3 dB @ >4 kHz - 10 kHz ±4.5 dB @ >10 kHz - 16 kHz ±5 dB @ >16 kHz - 20 kHz Actual Frequency Response freely available as Excel-data, register microphone at My NTi Audio and contact info@nti-audio.com Frequency Range 5 Hz - 20 kHz Residual Noise Floor typical 16 dB(A) 17dB(A) 21 dB(A) 25 dB(A) 27 dB(A) Maximum SPL @ THD 3%, 1 kHz, S_typical 137 dBSPL 138 dBSPL 144 dBSPL 153 dBSPL 142 dBSPL 26 Specifications Sensitivity typical @ 1 kHz Temperature Coefficient Temperature Range Pressure Coefficient Influence of Humidity (non-condensing) Humidity Long-term Stability Power Supply Current Consumption typical Electronic Data Sheet Output Impedance Connector Diameter Dimensions Length Dimensions Weight Environmental Protection NTi Audio # M2230 M2340 (with self-test) -27.5 dBV/Pa ±2 dB (42 mV/Pa) M2211 -34 dBV/Pa ±3 dB (20 mV/Pa) M2215 (high levels) -42 dBV/Pa ±3 dB (8 mV/Pa) < -0.01 dB / °C -10°C to +50°C (14°F to 122°F) < ±0.015 dB / °C -0.005 dB / kPa < ±0.05 dB -0.02 dB / kPa M4261 -36 dBV/Pa ±3 dB (16 mV/Pa) < ±0.02 dB / °C 0°C to +40°C (32°F to 104°F) -0.04 dB / kPa < ±0.4 dB 5% to 90% RH, non-condensing > 250 years / dB - 48 VDC phantom power 2.3 mA 0.8 mA 2.3 mA 1.7 mA NTi Audio ASD in accordance with IEEE P1451.4 V1.0, Class 2, Template 27 100 Ohm balanced Balanced 3-pole XLR 20.5 mm (0.8") 154 mm (6.1") 150 mm (5.9") 100 g, 3.53 oz 83 g, 2.93 oz IP51 600 040 050 600 040 230 600 040 022 600 040 045 600 040 070 27 Specifications Outdoor Measurement Microphones Classification with XL2 according to IEC 61672, ANSI S1.4 System Self-test (CIC) Diameter Dimensions Length Dimensions Weight Environmental Protection NTi Audio # M2230-WP (M2230+WP30) Class 1 Certified 36 mm (1.4") 378 mm (14.9") 430 g, 15.17 oz IP54 in vertical position 600 040 050 + 600 040 060 M2340-WP (M2340+WP30) Class 1 with XL2 36 mm (1.4") 378 mm (14.9") 430 g, 15.17 oz IP54 in vertical position 600 040 230 + 600 040 060 M4261-WP (M4261+WP61) Class 2 36 mm (1.4") 378 mm (14.9") 413 g, 14.57 oz IP54 in vertical position 600 040 070 + 600 040 080 28 Specifications Typical Frequency Response of Measurement Microphones Sensitivity relative [dB] 8 6 4 2 0 -2 -4 -6 -8 5 10 20 M4261 Tolerance Class 1, IEC61672-1 Tolerance Class 2, IEC61672-1 100 1000 log frequency [Hz] (free field conditions @ reference direction 0°) M2230, M2340, M2211, M2215 10000 20000 29 Specifications Free Field - Pressure Correction Factors If a measurement microphone is held in a free-field environment, then the measurement microphone acts at high frequencies like a reflector. The sound pressure increases in front of the microphone capsule membrane. M2230, M2340, M2211 and M2215 are free-field equalized measurement microphones, they compensate for the increased pressure internally. The calibration of the measurement microphones M2230 and M2340 with the B&K 4226 requires the accessory Adapter Ring MXR01, NTi Audio # 600 040 105. Please note, never touch the diaphragm of the measurement microphone capsule. The calibrator no longer offers free-field conditions. Therefore, the free-field equalization of the microphone must be compensated. This needs to be considered prior the calibration. The correction value needs to be added to the pressure response of the microphone. The following corrections apply with the B&K 4226 calibrator: Nominal Frequency [Hz] 31.5 63 125 250 500 1000 2000 4000 8000 12500 16000 M2230, M2340 with MXR01 Adapter [dB] -0.3 0.0 -0.2 -0.2 -0.2 0.0 0.1 0.7 2.7 7.2 7.3 M2230, M2340 [dB] 0.0 0.0 0.0 0.0 0.0 0.0 0.3 0.7 2.6 6.0 7.3 M2211 [dB] -0.2 0.0 -0.1 -0.1 -0.1 0.0 0.1 0.7 4.5 5.8 7.9 M2215 [dB] 0.0 0.0 -0.1 -0.1 -0.1 0.0 0.0 0.4 4.7 6.1 7.9 Measurement Uncertainty U [dB] 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.7 0.8 Example: · During the calibration, the XL2 measures the sound level in the calibrator. If the B&K 4226 calibrator is used and it is set to 16 kHz, then the XL2+M2230 reads just 86.7 dBA. · The free-field sound level is calculated by summing the XL2 measurement value and the correction value (86.7 dB + 7.3 dB = 94.0 dB). Correction values for other calibrators for M2230 and M2340: Type Correction Value Calibration Frequency Calibration Level NTi Audio CAL200 -0.1 1 kHz 114 dB B&K 4231 -0.2 1 kHz 114 dB Norsonic Nor-1251 -0.2 1 kHz 114 dB 30 Specifications Diffuse-field Sensitivity Level Correction A diffuse sound field is characterized by the sound arriving at the receiver from all directions with more or less equal probability. The M2230, M2340, M2211, M2215 and M4261 are free-field equalized measurement microphones. The default frequency response refers to a 0° sound incidence. The diffusefield sensitivity level correction is calculated by averaging the directional characteristics in accordance with IEC 61183. The corrections for diffuse-field conditions are documented in the following table and may be activated directly on the XL2; see Spectral Corrections. The directional response of the M2230 is described in the appendix. Example: · The sound pressure level in a diffuse sound field shall be determined. The display of the XL2 with the M2230 reads 80.0 dBA for the 20 kHz third-octave band. · The diffuse sound level is now calculated from the sum of the XL2 measurement value and the correction value (80.0 dB + 5.9 dB = 85.9 dB). The diffuse-field sensitivity level correction is not necessary using a diffuse field equalized measurement microphone. Nominal Frequency [Hz] <63 63 80 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000 20000 1/2" Microphone M2230, M2340, M2211, M2215 [dB] 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.2 0.2 0.4 0.6 0.8 1.3 1.8 2.5 3.4 4.4 5.3 5.9 1/4" Microphone M4261 [dB] 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.2 0.3 0.3 0.5 0.8 1.1 1.6 2.2 2.8 3.4 31 Specifications Free-field and Diffuse-Field Sensitivity for M2230 and M2340 11 00 --11 --22 --33 --44 --55 --66 --77 --88 --99 --1100 10 10 20 Idealized Free Field 100 1000 100 1000 log frequency [Hz] Diffuse Field Pressure 10000 10000 20000 sensitivity relative [dB] 32 Specifications Spectral Correction for horizontal Sound Incidents using the Outdoor Microphone The outdoor microphone M2230-WP fulfills Class 1 requirements of IEC 61672 and ANSI S1.4 for vertical sound incidence. For compliance with horizontal sound incidence a spectral correction is employed in the associated XL2 Sound Level Meter. Nominal Frequency [Hz] <800 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000 20000 WP30 Weather Protection [dB] 1/3 Octave 1/1 Octave 0.0 0.0 0.0 0.0 0.0 0.1 0.2 0.3 0.4 0.7 1.3 2.0 2.0 2.7 2.9 3.3 3.4 3.9 4.6 6.4 5.9 6.8 WP61 Weather Protection [dB] 1/3 Octave 1/1 Octave 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.3 0.4 0.8 1.4 2.1 2.0 2.5 2.3 2.4 2.5 2.8 3.0 3.1 3.0 3.1 33 Specifications Technical Data PreAmplifier MA220 PreAmplifier MA230 PreAmplifier with self-test (CIC) Microphone PreAmplifier Compatible with 1/2" microphone capsules type WS2F in accordance with IEC61094-4 Frequency Range (-3dB) Residual Noise Floor typical 4 Hz - 100 kHz 1.9 mV(A) at C_in 15 pF 5.6 dBA @ 42 mV/Pa 1.3 Hz - 50 kHz 2.4 mV(A) at C_in 15 pF 9.1 dBA @ 42 mV/Pa Frequency Response Flatness ±0.2 dB ±0.1 dB, 10 Hz - 20 kHz Phase Linearity Maximum Output Voltage @ THD 3%, 1 kHz < 1° @ 20 Hz - 20 kHz 21 Vpp 7,4 Vrms 138,9 dBSPL @ 42 mV/Pa 22 Vpp 7,8 Vrms 139,3 dBSPL @ 42 mV/Pa Electronic Data Sheet Containing user calibration data; default factory sensitivity = 4.9 V/Pa Read/write by XL2 Audio and Acoustic Analyzer NTi Audio ASD in accordance with IEEE P1451.4 V1.0, Class 2, Template 27 Impedance Input: 20 GOhm // 0.26 pF, Output: 100 Ohm balanced Power Supply 48 VDC phantom power, 2.3 mA typical 48 VDC phantom power, 0.8 mA typical Attenuation < 0.17 dB (Rphantom 2x 6.8 kOhm) < 0.07 dB (Rphantom 2x 6.8 kOhm) Connector Balanced 3-pole XLR Thread for Capsule 60 UNS2 Weight 90 g, 3.17 oz Dimensions Length 142.5 mm (5.6"), diameter 20.5 mm (0.8") Temperature Range -10°C to +50°C (14°F to 122°F) Humidity 5% to 90% RH, non-condensing NTi Audio # 600 040 040 600 040 200 The product specifications may vary based on the mounted microphone capsule type. 34