Microtech Gefell Sound Intensity Probe SIS 190 0.5"

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The sound intensity probe consists of one Measuring Microphone Capsules Pair MK 290 E (2x MK 222 E) with matched phase response and frequency response. Due to the use of two 1/4” Measuring Microphone Preamplifiers MV 310, sound field distortions (shadowing and diffractions) are minimal. The distance between both microphones is defined by spacers (12 mm, 50 mm). These enable measurements in a frequency range between 35 Hz and 5 kHz.

The quality of conformance between both measuring microphone capsules with regard to their transforming functions is measured in compliance with IEC 1043 and documented as Minimum pressure-residual intensity index for probes. Each microphone capsule pair comes with a measuring protocol.

Pre-amplifier		MV 310
Current consumption		2 to 10 mA
Transducer excitation voltage		24 to 30 V DC
Frequency range		20 Hz to 100 kHz
Range of tolerance	RL=100k; Ce=3.3nF; Ce=22pF	±0.1 dB
Gain	RL=100k; Ce=22pF	-1.0 dB @ 5 Hz
	RL=100k; Ce=22pF	-0.5 dB @ 1 kHz
	RL=100k; Ce=22pF	-0.7 dB @ 10 kHz
Input impedance		10 GOhm; <0.4 pF
Output impedance		<100 Ohm
Inherent noise	A-weighted; RL=100k; Ce=22pF	1.7 µVrms
	linear 20Hz to 20 kHz; RL=100k; Ce=22pF	4,2 µVrms
Plug		MALCO-Microdot; 10-32 UNF-2A
Microphone capsule		MK 290 E
Polarization voltage		0 V
Frequency range		35 Hz to 5 kHz
Open-circuit Sensitivity		50 mV/Pa
Max. SPL	≤ 3% THD at 1 kHz	146 dB
Inherent noise	A-weighted	16 dB