Spartan 821/721 Manual
IEC 61672-1 Section 9.3
B-13
FIGURE B-1
Windscreen Direction
EPS2116 Environmental Protection Shroud Corrections
The following table and graph display correction factors for effects of the EPS2116 on the response of the sound
level meter with either the PRM821 or PRM721 preamplifier and the 377B02 microphone. These corrections are
intended for laboratory use when testing to IEC 61672-2 to account for effects of the EPS2116. The corrections are
added to the electrical signals to replicate the acoustical response when the EPS2116 windscreen is in place. See
for the appropriate filter selection in the sound level meter for a given test, as well as the associated correction
factor to be applied. Note that the correction factors are tabulated in .
Table B.5 Test, Filter, and EPS2116 Correction Description
Test
Sound Level Meter
Filter
EPS 2116 Correction
Free Field Response
FF:FF 2116
Free Field to Free Field EPS2116
Correction Factor
90 Degree Response
FF:90 2116
Free Field to 90 Degree EPS2116
Correction Factor
Random Incidence
Response
FF:RI 2116
Free Field to Random Incidence EPS
2116
