SIS 194 3D

Sound intensity probe constant current powered
Capsule pair
Frequency range
1/2” MK 290 E
50 mm
35 Hz - 1,5 kHz

1/4” MK 390 E
12 mm
  7 mm
1 kHz -    6 kHz
1 kHz -  10 kHz

The sound intensity probe SIS 194 3D allows a simultaneous sound intensity measurement at one point of a room in all three dimensions. For this purpose an arrangement of three one-dimensional sound intensity probes is formed, thus all three
axes of the microphone pairs cross in one point and are in a plane perpendicular in each case. Each of those microphone pairs constitutes a one-dimensional sound intensity probe in conventional design.

In addition to measurement of sound pressure, each individual sound intensity probe - by its two-microphone-technology - enables the acquisition of the sound pressure gradient and thus the sound intensity computation. The probe consists of two in
phase- and frequency response matched measurement-microphone capsules MK 222 E (order drawing MK 290 E) and MK 301 E (order drawing MK 390 E). By the use of the constant current powered 1/4 ‘’ measurement-preamplifier MV 310 the sound field distortions (shading and diffraction) are minimal. The distance between the three microphone capsules is accurately defined by means of a spacer. Thereby measurements are possible in a frequency range from 35 Hz to 10 kHz.

The quality of conformity of both measurement capsules, relating to their transfer function, is measured in accordance with DIN EN 61043 and IEC 1043 respectively and documented as pressure-intensity-distance/residual-intensity-distance for probes.
To each measurement-capsule pair of the SIS 194 3D a measurement report is enclosed. On the basis of this report the compliance with tolerance limits for class 1 probes is apparent.
On customers request the match of both measurement-microphone capsules can be also documented as differences between phase- and frequency responses of both microphones. In this presentation the compliance of phase differences and level differences is guaranteed. Also a custom-specific selection of microphones of same kind for other applications or tolerances can be made; for example groups of three or four, up to special microphone-arrays or measurement-microphones respectively
paired measurement-microphones for low-frequency measurements.

The arrangement of the measurement-microphone preamplifiers is made by angular adaptors and a bend such that they are parallel and tight to each other and thus enables that the general arrangement can be kept small. This allows the access to tight measuring positions. The cable connections of the preamplifiers are separately led to the outside. The overall construction is carried by a bracket, which can be
adapted to a robot arm if necessary. A modular design allows an adjustment of required distances between the microphones and preamplifiers on the basic unit without using tools. In addition to this current-fed version, the 6-channal overall construction can be supplied with 200 V polarized measurement-microphone capsules- and preamplifiers for conventional LEMO-connection technology (type SIS 94 3D) as well.




Technical specifications