iSEMcon EMX-7150 User manual

EMX-7150
single use microphone,
matched pairs, triples, quads
iSEMcon
Measurement Microphones
The FOH choice
PRODUCT INFORMATION
01-17

AT A GLANCE
Standard windshield included
High SPL capability
freefield calibration data
diffusefield calibration data*1
1/4" acoustical port
Long microphone body
reduces early reflection effects
All stainless steel body
Factory replaceable electronics &
capsule
O-Ring seal
Water tight connection
when using Neutrik*2 NC-3FX-HD
connector
*1: approximated by 90deg incidence
response
*2 The corporate names and names of
the products stated in this brochure are
trademarks or registered trademarks of
the respective companies.
The EMX-7150 is a ¼” microphone made
from stainless steel and using state of the
art water tight Neutrik*3 connectors hav-
ing a very accurate frequency response
combined with the capability to

measure high sound pressure levels up
to 145dBspl.
It is a low impedance measurement
microphone that can be operated from
12…52 V Phantom Power which is
available on most professional micro-
phone preamplifiers and professional
computer interfaces. With its mechani-
cally robust design it is well suited for
harsh environment use such as open
air sound reinforcement measure-
ments. Its class 1 frequency response
(NOTE: NOT A CLASS 1 MICROPHONE)
makes it predestined for room acous-
tics analysis including recording studios
and home theaters. It can normally be
used without the included freefield
calibration data file for compensation.
In this case take the individual calibra-
tion data as proof of its superb per-
formance.
TYPICAL APPLICATIONS
 Sound-power and sound-field analysis
 Industrial acoustics
 Room acoustics analysis
 Sound reinforcement
 Real time analyzers
FEATURES
 Frequency range 10Hz…20kHz
 Sensitivity 6mV/Pa typ.
 Dynamic range ~30… >140dBspl
 3% distortion limits >143dBspl typ.
 Calibration chart and calibration data
files included on CD/USB stick.
 IEC 61672-2013 class 1 frequency re-
sponse
 Dimensions: acoustic port dia.¼” (7mm)
 Microphone body 0.75” (19mm)
 Overall length 6” (152mm)
 Weight 0.3oz (75 grams)

PERFORMANCE ENVIRONMENTAL
Frequency Response Characteristic Free-Field Operating Temperature Range -10…+55° Polarization Voltage Prepolarized Storage Temperature Range -20…+70° Nominal Sensitivity @1kHz 6mV/Pa Operating Humidity Range 0…90%r.H. Sensitivity Temperature Drift <0.015dB/K Axial Vibration Sensitivity ~ 50dB Microphone Polarity Non-Inverting PHYSICAL Frequency Response calibrated 10…20.000 Hz Housing Material Stainless Steel Frequency Response IEC61672 –2013 class 1 *1 Sealing O-ring/Polyurethane/Epoxy Inherent Noise100-10000 Hz <30dB typ. Output Connector XLR male Max. SPL. (3% distortion limit) > 141dBspl Dimensions Ø ¼“(7mm) x 6“(152mm) Max. SPL. (3% distortion) typ. =143 dBspl Weight 0.3 oz (75g) Max. SPL. (3% THD) @ 12V Phantom >140 dBspl CONFORMITY IEC 61000-6-1;
ELECTRICAL SPECIAL FUNCTIONALITY
Output Impedance < 200 ΩVoltage Surge Protection 
Phantom Power 12…52Vdc EMC Noise Filter 
SPECIFICATIONS
Values for 23° Celsius and 48V Phantom Power

FREQUENCY RESPONSE
ISOBARS, typical

POLAR PATTERNS, typical

THD vs SPL, typical
k2, k3 and THD (blue/red/green)
THD vs SPL, typical
Equivalent Noise: FFT, 1/3 Octave, A-
weighted, ITU-R 468 RMS weighted
(magenta, blue, green, red)

CALIBRATION DATA FILE FORMAT
Human readable ASCII file: 1/12 octave www.iSEMcon.com freefield Sensitivity 5.88 mV/Pa @1kHz 10.00 -0.02 11.26 0.10 ………. 19992.19 0.93 ^ frequency (Hz) ^amplitude response (dB
THD , ref 1kHz

The temperature characteristics of the sensi- tivity of an electret condenser microphone depends on the electrical characteristics of the microphone capsule built-in impedance con- verter and signal conversion circuitry as well as the acousto-mechanical characteristics of the diaphragm equivalent stiffness. iSEMcon is one of the first microphone manufacturers disclosing the secret about the temperature behavior of electrets based measurement microphones.
TEMPERATURE STABILITY

1kHz
Tempera-
ture
-20°C 6,92
0°C 6,83
10°C 6,71
20°C 6,62
35°C 6,60
45°C 6,57
55°C 6,50
The range for the measurement was
set at -20° to 65° C which is more than
iSEMcon microphones are normally
used at. The most important tempera-
tures are 10 °C up to about 55°C
which covers indoor as well as open air
use. It will give you a good predictable
performance whether it is used in a
cold autumn night or if the hot summer
sun “burns” the microphone body.
The table below shows the microphone
sensitivity change @ 1kHz. The diagram
on previous page shows how tempera-
ture affects the frequency response
behavior of an EMX-7150 microphone.
The microphone capsule itself is the
part being responsible for most of the
temperature change. (see also: Tem-
perature characteristics of electret con-
denser microphones Acoust. Sci. &
Tech. 27, 4 (2006))
Microphone sensitivity vs. Temperature
typical