Page 9
Sound Level Meters – User Manual
Please note that the clock might need to be set again if the instrument is stored without batteries
for a prolonged period.
2.3
Calibration
All noise measuring instruments should be calibrated before each use because the microphone
is susceptible to minor damage, even from small knocks.
The calibration process applies corrections (if needed) to your instrument’s readings, to ensure
that your measurements are as accurate as possible.
Calibration should also be carried out at the end of a measurement session to make sure that
nothing has happened to the instrument during the session.
To calibrate your sound level meter, carefully push the microphone into the cavity at the end of
the calibrator. Ensure the microphone is fully inserted into the cavity and is past the ‘O’ ring
seals.
Ensure that the small bleed hole next to the microphone cavity on the calibrator is not blocked,
as this could cause damage to the microphone.
Take care not to use a twisting motion when pushing the microphone into the calibrator, as this
is likely to cause damage to the preamplifier.
Press the ‘on’ button on the end of the calibrator. Press the calibrate button on your sound level
meter.
Summary of Contents for Optimus+
Page 1: ...Instrument Handbook Optimus GPS Sound Level Meters...
Page 22: ...Page 22 Optimus Sound Level Meters User Manual A pin identifies the measurement location...
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