Spartan 821/721 Manual
IEC 61672-1 Section 9.3
B-1
Appendix B
Measuring Sound Using IEC 61672-1
This appendix presents information for assessing the sound level meter functionality of the Larson Davis Spartan
821/721 according to IEC 61672-1 Edition 2.0 2013-09.
Microphone correction filters should be set to FF:FF except when testing to IEC 61672-2 Section 9.4.2 - Windscreen
Corrections. The appropriate corrections and filter selections are described in this appendix, see
Frequency Response and Corrections
. For all IEC61672-3 testing, microphone correction filters should be set to
“Off”.
B.1 IEC 61672-1 Section 9.3
a) Reference Sound Pressure Level
The reference sound pressure level is 114 dB re 20 µPa.
b) Reference Level Range
There is a single level range.
c) Microphone Reference Point
The microphone reference point is the center of the diaphragm of the 377B02 microphone.
d) Multi-Frequency Calibrator and Electrostatic Actuator Corrections
These tables list A-weighted microphone adjustments for the 821/721 with PRM821/377B02 for periodic
measurements.
e) Required Frequency Response and Corrections
Frequency response and corrections for the 721 are identical to those shown for 821 in the following tables
and figures, which describe the frequency response and corrections required by IEC61672-1, Section 9.3:
•
Table B.1 "821 with PRM821/377B02 Average Frequency Responses and Corrections, Required by
•
Table B.2 "821 with PRM821/377B02 Random Incidence Responses and Corrections, Required by
•
Table B.3 "Directional Response (from 0° to 90°) of 3 ½-inch Windscreen"
•
Table B.4 "Directional Response (from 100° to 180°) of 3 ½-inch Windscreen"
•
Table B.5 "Test, Filter, and EPS2116 Correction Description"
•
Table B.6 "Effects of EPS2116 Environmental Shroud"
•
Figure B-1 Windscreen Direction
•
Figure B-2 Graph of the EPS2116 Environmental Shroud Random Incidence Response
B
