Bedrock SM50, Руководство по эксплуатации, Страница: 25 / 39

24 Bedrock SM50 operating manual © Embedded Acoustics BV, 2015
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To start calibrating, apply the calibrator to the microphone, or place the microphone in a
known sound field. The press “start.” Do not worry if the reference level shown is incorrect;
you can change this after the measurement. An octave band spectrum will be shown while
the equivalent-continuous A-weighted sound level is measured. Once this measurement is
finished, the SM50 will show the results.
Calibration module showing calibration results.
The new calibration factor (sensitivity adjust) of the device is shown, as well as the origi-
nal calibration factor as currently used in the device. The differences between the old and
new value are typically small (less than 5 dB), unless you have connected a different signal
source or microphone than the device is currently calibrated for.
The calibration factor is derived from the measured LAeq, as well as the reference level
of your calibration signal source. You can now change the reference signal level; press the
corresponding button on the right of the screen, and enter the correct value through the
keypad that will appear on your screen. The calibration factor will be re-calculated.
If you are satisfied that the new calibration factor is correct, press save. Note that the new
calibration settings only take effect once you press save.
We recommend that you verify your new calibration in the SPL meter module. Re-apply
your calibration signal source, and check that the correct reference level is measured.
Once you press “save,” the measured calibration factor is committed perma-
nently to the device’s non-volatile memory. This overrides earlier calibra-
tions.