Page 18 - iSEMconCatalog

TEMPERATURE STABILITY
The temperature characteristics of
the sensitivity of an electret con- iSEMic 725TR temperature drift
denser microphone depends on the
electrical characteristics of the mi- 1,5
crophone capsule built-in imped- 1
ance converter and signal conver- 0,5
sion circuitry as well as the acousto 0
-mechanical characteristics of the -0,5
diaphragm equivalent stiffness.
iSEMcon is one of the first micro- -1
phone manufacturers disclosing the -1,5
secret about the temperature be- -20°C -10°C 0°C 10°C 20°C 30°C 40°C 50°C 60°C
havior of electrets based measure-
ment microphones. dB dB
uncompensated mic
compensated 725TR mic

The range for the measurement
was set at -20ºC to 60ºC which is more than iSEMcon Ref. 1kHz dB dB
microphones are normally used at. The most important
temperatures are 10 °C up to about 50°C which covers compensated uncompensated mic
indoor as well as open air use. It will give you a good 725TR mic capsule
predictable performance whether it is used in a cold au- -20°C 0,2 -1,4
tumn night or if the hot summer sun “burns” microphone -10°C 0,2 -1
body. 0°C 0,1 -0,7
The table above shows the microphone sensitivity
change at 1kHz. The microphone capsule itself is the 10°C -0,1 -0,4
part being responsible for most of the temperature Temp 20°C 0 0
change. The iSEMic electronics compensates for both 30°C -0,1 0,2
the electronics itself as well as the microphone capsule. 40°C 0 0,4

(see also: Temperature characteristics of electret 50°C 0,1 0,7
condenser microphones Acoust. Sci. & Tech. 27, 4 60°C 0,3 1,1
(2006).
Ordering information:
Order No. Name
480002 iSEMic 725TR base kit-2 including SA-XBF Phantom power Adapter,
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, microphone bulk, without
460001 SA-iBF adapter (iPhone, iPad, others) CTIA/AHJ compliant
460002 SA-SBF adapter (others) OMTP compliant
460003 SA-XBF adapter, impedance symmetrical power and signal adapter. Current limiting.
460004 SA-CBF adapter, BNC to SMB adapter
460010 SA-BFM500 extension rod
470012 CX-P48/BF 5m, asymetrical—hot input used. Cold shortened to gnd
470022 CX-BFBM 2m SMX extensions cable
470032 CX-TRSBF 2m 3.5mm stereo plug to SMB (laptop computer)
470041 CX-TA4FBF-1m, TA4F 4pol mini XLR to SMB cable
470042 CX-TA$FBF-2m, TA4F 4 pol mini XLR to SMB cable
220023 MH-07D/iSEMic-CA Microphone bushing
240030 WS-7XL windscreen
230300 CA-1/4/2 : 1/4" to 1/2" insertion adapter for 1/2“ calibrators

Page 18 iSEMcon GmbH