Model 14 Sound Level Meter User Manual
Taking Measurements
Before taking measurements, ensure the instrument has a new or highly charged
battery fitted. The instrument is supplied with a battery but it is not fitted for transit.
See page 9 for details of fitting and changing the battery.
Turn the instrument on by moving the OFF/F slide switch to the F position:
> OFF = Instrument is powered off.
> F = Fast Time Weighting
Allow the instrument to settle for 10 seconds before calibrating or taking
measurements.
Ensure the instrument is calibrated (see page 10 for details of calibration)
Select the required Frequency Weighting using the A/C slide switch:
> A = A-Weighting or dB(A)
> C = C-Weighting or dB(C)
Select the most appropriate range for the acoustic environment using the H/L slide
switch:
> L = Low Range (suitable for levels up to 100dBA)
> H = High Range (suitable for levels over 65dBA)
If the maximum exceeded level is required then press the MAX HOLD button for at least
½ second.
Once released the text HOLD is illuminated in the top left of the instrument display. In
this mode the highest measured sound pressure level is displayed.
To turn off the maximum hold facility either press the MAX HOLD button again or turn
the unit off.
Fundamental precautions
This section contains some simple points that should be considered when using the
Model 14 instrument:
a) Allow the instrument to settle for 10 seconds after switching on before calibrating
or taking measurements.
b) Always check the battery before and after each measurement. The Model 14
monitors the battery continuously while operating.
c) Ensure that the white MAX HOLD function is turned off when not required. If this
is not done, the display will freeze the last reading and the word HOLD will be
displayed on the top left of the LCD.
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