iSEMcon iSEMic Series Use and care manual

iSEMic
series microphones &
accessories
„ONE MIC SERVES ALL“
Calibration data
my.isemic.com

CALIBRATION DATA
Human readable ASCII file: 1/6 octave
www.iSEMcon.com freefield
Sensitivity 2.85 mV/Pa @1kHz
10.00 -0.02
11.26 0.10
……….
19992.19 0.93
^ frequency (Hz) ^amplitude response
(dB
Visit
my.iSEMic.com
for further information and calibration
file download

iSEMic microphones (s) at A GLANCE
The new ¼“ iSEMic Microphone and Ac-
cessories Series is supply and signal volt-
age compatibility to iPhone*1, iPad*1 as
well as other mobile devices including
laptop computers and Phantom Powered
Pro Audio Equipment. The superb func-
tionality is provided by the space saving
microphone built-in electronics.
The advantages of the new iSEMic micro-
phone series are obvious. Mobile devices
like iPad’s and iPhone’s are more and
more used for controlling live sound mix-
ers and PA Systems giving the FOH and
system engineers the possibility of walk-
ing the venue while optimizing for sound
and acoustics using special apps on mo-
bile devices.

With its mechanically robust design it is
well suited for harsh environment use
such as open air sound reinforcement
measurements.
Its class 2 frequency response 1 makes it
predestined for room acoustics 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 calibration data as proof of its
superb performance.
Back at the FOH place the same micro-
phone can be used to service the PC or
MAC computer by the use of an off-the-
shelf USB interface and XLR cable.

FEATURES
 Excitation voltage 2.5V to 52Vdc ,
current limited
 Powers from: iPhone, iPad, other mo-
bile devices, laptop computers, Phan-
tom Power, ICP/IEPE power.
 Frequency range 20Hz…>20kHz
 IEC 61672 class 2 frequency response
Standard (125dBspl) and High-SPL
(>135dB) version
 Extended temp (+95°C/200°F) range
and/or IP54 (watertight) option upon
request
 Surge voltage protection
 Calibration chart and calibration data
files included
 Stainless steel body, Gold plated con-
nectors
 Microphone body dia. 1/4” (7 mm)

 Microphone length 3,7” (94 mm)
TYPICAL APPLICATIONS
 Sound-power and sound-field analysis
 Industrial Acoustics
 Room acoustics analysis
 Sound reinforcement
 Real time analyzers

PERFORMANCE
Frequency Response Characteristic Free-Field Polarization Voltage Prepolarized Nominal Sensitivity @1kHz 3mV/Pa Sensitivity Temperature Drift <0.015dB/K typ Microphone Polarity Non-Inverting Frequency Response calibrated 10…20.000 Hz Frequency Response IEC61672 *1 class 2 Inherent Noise100-10000 Hz <30dB typ. Max. SPL. (3% distortion limit) > 125dBspl
ELECTRICAL
Output Impedance < 200 Ω
Supply voltage (BIAS, PHANTOM, IEPE) 2.5…52Vdc
SPECIFICATIONS values for 23ºCelsius

ENVIRONMENTAL
Operating Temperature -10…+55° Storage Temperature Range -20…+90° Operating Humidity Range 0…90%r.H. Axial Vibration Sensitivity ~ 50dB
PHYSICAL
Housing Material Stainless Steel Output Connector SMB Dimensions Ø ¼“(7mm) x 3.7“(94mm) Weight 0.3 oz (10g)
CONFORMITY IEC 61000-6-1; SPECIAL FUNCTIONALITY
Voltage Surge Protection  EMC Noise Filter 

PRODUCT OVERVIEW
Base kit + additional Phantom Power
Adapter
special accessory —extension rod

accessories: cables, holding clamp, shock-
mount, adapters
more... www.iSEMcon.com

PRODUCT OVERVIEW
Base kit + additional
Phantom Power Adapter
Accessories:
more... www.iSEMcon.com

ORDERING INFORMATION
Item Name
480001 iSEMic 725TR base kit,
725TR microphone, SA-iBF adapter for iPhone/iPad,
windscreen, brochure, individual calibration data
(freefield&diffusefield) download from my.isemic.com
at no cost, metal box.
400001 iSEMic 725TR
460001 SA-iBF adapter
460002 SA-SBF adapter
460003 SA-XBF adapter
460004 SA-CBF adapter
460010 SA-BFM500 extension rod
470012 CX-P48/BF
470022 CX-BFBM
470032 CX-TRSBF
222020 MH-CH19
222050 MH-SH19
220023 Microphone bushing
MH-07D/iSEMic-CA
240030 WS-7XL windscreen
230300 CA-1/4/2 : 1/4" to 1/2" insertion adapter

APPLICATION NOTES
FREEFIELD vs. DIFFUSEFIELD USE
Only a small percentage of all acoustical
measurements are performed in a well
defined and/or well controlled
environment of an e.g. acoustical labora-
tory –on the contrary most acoustical
measurements are done under not really
controlled conditions. Here are some
hints on how to use our microphone.
Sound Fields:
Free field: There are no reflecting objects,
only the microphone disturbs the sound
field.
Diffuse field: There are many reflecting
surfaces or sound sources so that the
sound waves arri ve from all directions.

Pressure field: This is found in small
confined spaces like sound calibrators.
Depending on the nature of the sound
field an appropriate microphone, which is
optimized for the sound field could be
selected. Unfortunately there are many
practical situations where the sound field
is not really of a well defined type. This
application note should give you an idea
on how to measure with a free field re-
sponse microphone.
The free field microphone is the most
common in use, chosen on tradition but
we should know about the sound field.
The following picture shows both the free
field and the diffuse field response of a
free field microphone.

The diffuse field response is not easy to
measure, because it is not easy to gener-
ate a truly diffuse sound field over a wide
frequency range but there is a

procedure to estimate the diffuse field
frequency behavior of a free field micro-
phone.
From literature we know, that a micro-
phone’s random (diffuse) incidence

response can be approximated by
measuring the 90 deg incidence re-
sponse relative to a single sound
source.
While it is an approximation only iSEM-
con has measured the 90deg response
of many iSEMic microphones and used
the averaged data to evaluate a 5th
order polynomial. This is now used to
derive the “diffuse field” response from
the microphones free field response
data.
Typical freefield measurement:
Speaker measurement. The micro-
phone should target to the sound
source (speaker).

Typical diffusefield meas-
urements:
Concert SPL monitoring
(normally at FOH), Room
Acoustics measurement
(RT60): the microphone
should not target to the
sound source. Let it target
to the ceiling. This is the
most practical way.

This microphone is a maintenance free
product but could require a recalibration
in case of a mechanical impact or perodi-
cal temperature cycling/use at the min
and max working temeperature.
In an unlikely event of equipment failure,
please contact your local iSEMcon repre-
sentative or the iSEMcon factory located
in Germany ([e-mail]).
Unauthorised dismantling of the mic-
rophone will invalidate the warranty.
MAINTENANCE
ELECTRONIC WASTE
This electronic device should be disposed
separately from your household waste at
the end of its lifetime. There are various
collection systems for