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Trouble Shooting Guide
Question
Answer
My instrument will not turn on?
Check that there is a battery fitted to the
instrument and of correct polarity.
Check that the battery is not flat.
What is the white plastic cap
fitted to the top of the
microphone?
This is a protective cover for the sensitive
microphone. You must remove it before
using the instrument.
Where have my results gone?
Models I or B do not have a backup memory
so all readings are lost when the instrument
is switched off. Always take a note of
important readings before switching off the
instrument.
My instrument is on but will not
respond to keypad presses?
Have you locked the keypad ?
I keep getting CAL FAIL when
trying to calibrate my
instrument – what am I doing
wrong?
Is the instruments microphone properly
inserted in the calibrator?
Is the calibrator switched on and working?
Has the instrument and/or calibrator been
knocked or moved as the calibration routine
is taking place?
Has the microphone been damaged?
What is the black o-ring inside
my calibrator’s cavity for?
The o-ring is essential to seal around the
microphone stabilizing the pressure in the
calibrator’s cavity. If the o-ring is missing
and/or damaged the instrument will not
calibrate properly (see above).
When taking readings the
display is constantly flashing
**UR**
– what does this mean?
This means that the noise you are
measuring is below the bottom of the range
you have the instrument selected to. Try
selecting a lower range
My readings are within range
but I keep getting OVERLOAD
flashing on the screen – why is
this?
The overload is triggered by the Peak
reading whereas Lp and Leq are rms
figures which are lower. Some noises
feature very high peaks compared to the
rms.
