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2. Press the
change to the next value.
> Press the
5.4.
Showing / hiding the date / time
> Press the
5.5.
Switching the display illumination on / off
Switching on / off manually
> Press the
Automatic switch-off
The display illumination is switched off automatically after 30 s.
5.6.
Changing the frequency weighting
> Press the
5.7.
Changing the time weighting
> Press the
or
key to set a value, press the
key to cancel the process.
key.
key.
Frequency weighting A is used for standard sound level
measurements. This weighting corresponds to the
perception of sound by the human ear. "Aurally
compensated" volume is referred to in this context.
If the low-frequency portions of a sound are also to be
weighted, frequency weighting C is used. If the displayed
C-weighting value is considerably higher than the A-
weighting value, then there is a large amount of low-
frequency noise.
key.
The ranges "Slow", with a time weighting of 1s, and "Fast",
with a time weighting of 125ms, are available. The incoming
sound signals are incorporated over a period of 1 s or 125 ms
accordingly. If "Fast" is set, the rate at which readings are
shown in the display increases from one reading per second to
around 5 - 6 readings per second. The "Slow" time weighting
should be selected for noises whose signals only change in
volume gradually, such as machines, photocopiers, printers
etc. Select the "Fast" mode to measure sudden changes in
sound level (e.g. building machinery).
key.
5 Using the product
key to
17
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