NTi Audio M2230 Class 1 Measurement Microphone
Technical Data Measurement Microphones
| M2230 | M2340
(with self-test) |
M2211 | M2215
(high levels) |
M4261 | |
| Classification with XL2 accord- ing 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 dB SPL | 144 dB SPL | 153 dB SPL | 142 dB SPL |
| M2230 | M2340
(with self-test) |
M2211 | M2215
(high levels) |
M4261 | |
| Sensitivity typical @ 1 kHz | -27.5 dBV/Pa ±2 dB
(42 mV/Pa) |
-34 dBV/Pa ±3
dB (20 mV/Pa) |
-42 dBV/Pa ±3
dB (8 mV/Pa) |
-36 dBV/Pa ±3 dB
(16 mV/Pa) |
|
| Temperature Coefficient | < -0.01 dB / °C | < ±0.015 dB / °C | < ±0.02 dB / °C | ||
| Temperature Range | -10°C to +50°C (14°F to 122°F) | 0°C to +40°C (32°F to 104°F) | |||
| Pressure Coefficient | -0.005 dB / kPa | -0.02 dB / kPa | -0.04 dB / kPa | ||
| Influence of Humidity (non-condensing) | < ±0.05 dB | < ±0.4 dB | |||
| Humidity | 5% to 90% RH, non-condensing | ||||
| Long-term Stability | > 250 years / dB | – | |||
| Power Supply | 48 VDC phantom power | ||||
| Current Consumption typical | 2.3 mA | 0.8 mA | 2.3 mA | 1.7 mA | |
| Electronic Data Sheet | NTi Audio ASD in accordance with IEEE P1451.4 V1.0, Class 2, Template 27 | ||||
| Output Impedance | 100 Ohm balanced | ||||
| Connector | Balanced 3-pole XLR | ||||
| Diameter Dimensions | 20.5 mm (0.8”) | ||||
| Length Dimensions | 154 mm (6.1”) | 150 mm (5.9”) | |||
| Weight | 100 g, 3.53 oz | 83 g, 2.93 oz | |||
| Environmental Protection | IP51 | ||||
| NTi Audio # | 600 040 050 | 600 040 230 | 600 040 022 | 600 040 045 | 600 040 070 |
Outdoor Measurement Microphones
| M2230-WP (M2230+WP30) | M2340-WP (M2340+WP30) | M4261-WP (M4261+WP61) | |
| Classification with XL2 accord- ing to IEC 61672, ANSI S1.4 | Class 1 Certified | Class 1 | Class 2 |
| System Self-test (CIC) | – | with XL2 | – |
| Diameter Dimensions | 36 mm (1.4”) | 36 mm (1.4”) | 36 mm (1.4”) |
| Length Dimensions | 378 mm (14.9”) | 378 mm (14.9”) | 378 mm (14.9”) |
| Weight | 430 g, 15.17 oz | 430 g, 15.17 oz | 413 g, 14.57 oz |
| Environmental Protection | IP54 in vertical position | IP54 in vertical position | IP54 in vertical position |
| NTi Audio # | 600 040 050 + 600 040 060 | 600 040 230 + 600 040 060 | 600 040 070 + 600 040 080 |
Typical Frequency Response of Measurement Microphones
Free Field – Pressure Correction Factors
If a measurement microphone is held in a free-field environ-ment, then the measurement microphone acts at high fre-quencies like a reflector. The sound pressure increases in front of the microphone capsule membrane. M2230, M2340, M2211 and M2215 are free-field equalized measurement mi-crophones, they compensate for the increased pressure inter-nally. 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 compen-sated. This needs to be considered prior the calibration. The correction value needs to be added to the pressure response of the microphone.
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).
The following corrections apply with the B&K 4226 calibrator:
|
Nominal Frequency [Hz] |
M2230, M2340
with MXR01 Adapter [dB] |
M2230, M2340 [dB] | M2211 [dB] | M2215 [dB] | Measurement Uncertainty U [dB] |
| 31.5
63 125 |
-0.3
0.0 -0.2 |
0.0
0.0 0.0 |
-0.2
0.0 -0.1 |
0.0
0.0 -0.1 |
0.3
0.3 0.3 |
| 250
500 1000 |
-0.2
-0.2 0.0 |
0.0
0.0 0.0 |
-0.1
-0.1 0.0 |
-0.1
-0.1 0.0 |
0.3
0.3 0.3 |
| 2000
4000 8000 |
0.1
0.7 2.7 |
0.3
0.7 2.6 |
0.1
0.7 4.5 |
0.0
0.4 4.7 |
0.3
0.3 0.4 |
| 12500
16000 |
7.2
7.3 |
6.0
7.3 |
5.8
7.9 |
6.1
7.9 |
0.7
0.8 |
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 |
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 prob-ability. The M2230, M2340, M2211, M2215 and M4261 are free-field equalized measurement microphones. The default frequency response refers to a 0° sound incidence. The diffuse-field sensitivity level correction is calculated by averaging the directional characteristics in accordance with IEC 61183. The corrections f or 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] | 1/2” Microphone M2230, M2340, M2211, M2215 [dB] | 1/4” Microphone M4261
[dB] |
| <63
63 80 |
0.0
0.0 0.0 |
0.0
0.0 0.0 |
| 100
125 160 |
0.0
0.0 0.0 |
0.0
0.0 0.0 |
| 200
250 315 |
0.0
0.0 0.0 |
0.0
0.0 0.0 |
| 400
500 630 |
0.0
0.0 0.0 |
0.0
0.0 0.0 |
| 800
1000 1250 |
0.0
0.0 0.1 |
0.0
0.0 0.1 |
| 1600
2000 2500 |
0.2
0.2 0.4 |
0.1
0.1 0.2 |
| 3150
4000 5000 |
0.6
0.8 1.3 |
0.3
0.3 0.5 |
| 6300
8000 10000 |
1.8
2.5 3.4 |
0.8
1.1 1.6 |
| 12500
16000 20000 |
4.4
5.3 5.9 |
2.2
2.8 3.4 |
Free-field and Diffuse-Field Sensitivity for M2230 and M2340
Spectral Correction for horizontal Sound Incidents using the Outdoor Microphone
The outdoor microphone M2230-WP fulfills Class 1 require-ments of IEC 61672 and ANSI S1.4 for vertical sound incidence. For compliance with horizontal sound incidence a spectral cor-rection is employed in the associated XL2 Sound Level Meter.
| Nominal Frequency [Hz] | WP30
Weather Protection [dB] |
WP61
Weather Protection [dB] |
||
| 1/3 Octave | 1/1 Octave | 1/3 Octave | 1/1 Octave | |
| <800 | 0.0 | 0.0 | 0.0 | 0.0 |
| 800 | 0.0 | 0.0 | ||
| 1000
1250 |
0.0
0.1 |
0.0 | 0.0
0.0 |
0.0 |
| 1600 | 0.2 | 0.2 | ||
| 2000
2500 |
0.3
0.7 |
0.4 | 0.3
0.8 |
0.4 |
| 3150 | 1.3 | 1.4 | ||
| 4000
5000 |
2.0
2.7 |
2.0 | 2.1
2.5 |
2.0 |
| 6300 | 2.9 | 2.3 | ||
| 8000
10000 |
3.3
3.9 |
3.4 | 2.4
2.8 |
2.5 |
| 12500 | 4.6 | 3.0 | ||
| 16000
20000 |
6.4
6.8 |
5.9 | 3.1
3.1 |
3.0 |
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) | 4 Hz – 100 kHz | 1.3 Hz – 50 kHz |
| Residual Noise Floor typical | 1.9 V(A) at C_in 15 pF ≙ 5.6 dBA @ 42 mV/Pa | 2.4 V(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 | < 1° @ 20 Hz – 20 kHz | |
| Maximum Output Voltage @ THD 3%, 1 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.
Frequently Asked Questions
Q: How do I register my microphone at My NTi Audio?
A: To register your microphone, visit the My NTi Audio website and follow the provided instructions for registration.
Q: What is the maximum SPL of the M2215 microphone?
A: The maximum Sound Pressure Level (SPL) of the M2215 microphone is 144 dBSPL at 3% Total Harmonic Distortion (THD) at 1 kHz.
Documents / Resources
 |
NTi Audio M2230 Class 1 Measurement Microphone [pdf] Owner's Manual M2230, M2340, M2211, M2215, M4261, M2230-WP, M2340-WP, M2230 Class 1 Measurement Microphone, M2230, Class 1 Measurement Microphone, Measurement Microphone, Microphone |
