Instruction Manual

Sound Level Meter Types 2245 – Instruction Manual Page 10 of 110
2.3.1 Measurement settings
The acoustical frequency response and calibration depends on the sound field, the
microphone, the microphone accessories used and the electrical frequency response.
To improve the quality of the measurement and help the user to measure correctly the
sound level meter compensates for the sound field, the microphone and the
microphone accessories used by automatically changing the electrical frequency
response and calibration.
This means that it is very important that parameters in Measurement settings and its
sub menus are correct.
Use Measurement settings > Input to select:
 Microphone to use (if more than one has
been specified in System settings > Advanced
settings > Microphones)
 Sound field. Select a correction matching
the sound field of your measurements, that is,
you can make correct measurements in a
diffuse-field using a Type 4966 free-field
microphone, by selecting Diffuse-field
correction. Even Free-field correction of a free-
field microphone will enhance the overall
frequency response of the system. Generally,
ISO requires free-field conditions and ANSI
requires diffuse-field conditions. Check your
local standards for the setting you require. No
correction is made for an unknown
microphone.
 Windscreen detect. Enabled/Disabled
automatic detection of windscreen UA-1650
when mounted on the microphone
preamplifier.
 Windscreen type. Select type of
windscreen, when Windscreen Detect is
Disabled.