6
6
7
7
Operating
Sound level measuring
Press
ON / OFF
to turn the unit on. During the self-test when powering up,
initially all segments are lit in the display. Then follows an initialization phase,
in which the unit counts down in the display. Only after that, the unit starts
measuring of the current level values. Point the microphone towards the sound
source to be measured.
The sound is displayed both numerically in a seven-segment display as well
as graphically in a bargraph. The numeric value is updated every 160 ms, the
bargraph every 40 ms.
Selecting A or C-weighting
After turning on, the device is in measurement mode ‘A-weighting’. In this
mode, the signal spectrum is evaluated according to the sensitivity of the hu-
man ear.
A-weighting should be used for environmental measurements or measure-
ments in the workplace. In particular, this filter should be used when sound
level measurements are carried out in the context of legal noise insulation
regulations.
The C-type weighting filter is mainly for the lower ranges of advantage. The
signal spectrum is evaluated linearly. For example, C-weighting is suitable for
noise analysis of engines or machines.
To switch between the two weighting filters, press the
C/A
button. The cur-
rently selected weighting filter is indicated by an ‘A’ or ‘C’ on the right side of the
display.
Selecting the slew rate
Use the
F / S
button to toggle the inertia of the display between fast and slow.
The selected mode is displayed on the right side of the display.
After turning the unit on, it is in fast mode.
Storing the maximum sound level
1. Press the
MAXHLD
button during measurement to store the decimally
measured value on the display. The lower part of the display indicates the
MAX HOLD mode. The digital display now shows the highest previously
measured sound level values on the numeric display. The bar graph goes on
showing the current noise level values.
2. Press the
MAXHLD
button again to exit the mode again.
