Manual

Sound Level Meter

The advantage of wav-ﬁle recordings is to identify and docu-

ment sound sources after the measurement. For example, at

a live event an excessive peak level may have been measured

and logged. Actually, this peak level was caused by people

shouting nearby the measurement microphone, and not by the

audio system being monitored. The recorded wav-ﬁle assists in

verifying this and the test results can then be post-processed.

Pausing Measurement

If any ongoing measurement is paused , the

XL2 continues the recording of wav-ﬁles during

the paused period. The logged data and audio

data can be synchronized using the stored real-

time information.

Events

The wav-ﬁles are stored in a folder, named, for

example,

2011-11-30_SLM_000_AudioEvent_0001-0200.

The actual wav-ﬁles are named for example, as

xxxx_FS133.0dB(PK).wav (xxxx = incrementing

number)

Another example is environmental noise monitoring: Listening

to the recorded wav-ﬁle after the measurement may help to

determine the predominant sound source. The XL2 Analyzer

preserves the original absolute test signal level in the recorded

wav-ﬁle.

The XL2 Analyzer provides three input ranges to accom-

modate the wide range of input signals. The dynamic range

of the recorded wav-ﬁle is set according to the selected in-

put range. For example, at a microphone sensitivity of

S= 20 mV/Pa, the full scale peak level is:

Range Name Range Level Full scale peak level

Lower range 10 - 110 dBSPL 117.8 dBSPL

Middle range 30 - 130 dBSPL 135.9 dBSPL

Upper range 50 - 150 dBSPL 159.9 dBSPL

Select the lowest possible input range accord-

ing to the maximum level expected during the

measurement; e.g., If the sound pressure will

always be below 110 dBSPL, select the lowest

input range 10 - 110 dBSPL.