Larson Davis 824 User Manual

C-22 824 Reference Manual 9/29/09
NOTE: Results in dB referenced to 101
kPa
Position of Instrument and Operator:
When making a measurement, it is recommended that the
observer be positioned as far behind and to the right of the
instrument as possible to minimize interference of the sound
field at the microphone resulting from body reflections.
When using the 824, the meter is held in one hand with the
arm extended away from the body. Better results can be
obtained by using a tripod.
Effect of Windscreen:
The Corrections which should be subtracted from the
measured data when using the Larson-Davis Model WS001
3
½ inch diameter windscreen with a ½ inch Larson-Davis
microphone are as indicated in the following graphs.
Ambient Pressure Response of Free-Field Microphones
(Variation over Static Pressure)
Pressure 65 kPa 75 kPa 85 kPa 93 kPa 101 kPa 110kPa
2520 .38 dB .20 dB .14 dB .069 dB 0.000 -.047 dB
2540 .34 dB .24 dB .15 dB .08 dB 0.000 -.075 dB
377B41 .43 dB .31 dB .19 dB .099 dB 0.000 -.10 dB

Larson Davis 824 Specifications

General

Brand	Larson Davis
Model	824
Category	Measuring Instruments
Language	English