Special filters
• G filter for infrasound measurements from 1 Hz to 100 Hz; conforms
to the ISO / DIS 7196 standard.
• Diffuse field compensation filter that improves the complete instrument
frequency response in the diffuse acoustic field (see below)
SV 958A diffuse field compensation filter
• Environment compensation filter that improves the instrument frequency
response in the free acoustic field when using with the Outdoor
microphone kit SA 277C for the 90 deg incidence angle (see
sections C.7 and C.8)
• Airport compensation filter that improves the instrument frequency
response in the free acoustic field when using with the Outdoor
microphone kit SA 277C for the 0 deg incidence angle (see
sections C.7 and C.8)
Note: SVAN 958A and the MK 255 microphone are used to perform the measurements in
the free field. In order to measure in the diffuse field or with the use of the SA 277C outdoor
microphone kit, the user should select the appropriate compensation filter (see Chapter
4.2).
Note: Using special filters might change the frequency response and measuring ranges of
SVAN 958A. Please check the below given specification.
Linear operating ranges for LEQ measurements with the Diffuse compensation
The starting point at which tests of level linearity shall begin is 94.0 dB for the frequencies specifies below. For
the Low measurement range and A weighting linearity test at 31.5 Hz, the starting point is 74 dB.
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