Testo testo 815 Sound level-measuring apparatus, Noise-measuring apparatus 0563 8155 用户手册

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Setting the measurement range

The measurement range is switched using the 

button.

Level:
The testo 815 sound level meter covers the range 32 to 130 dB.
The measurement ranges 32 to 80, 50 to 100 and 80 to 130 dB
are available. The meter is in the lowest measurement range 32 to
80 dB when first switched on. The measurement range is
switched each time to a higher level by activating the "LEVEL"
button. You can switch back into the lowest range 32 to 80 dB
from the highest range 80 to 130 dB.

MAX/MIN - Hold Function

Use the 

button to activate the Max Hold or Min Hold

function. "Max" appears in the display once the "Max/Min" button
is activated. In this mode, the meter shows the maximum value of
the sound level since the max mode was set. The display is only
updated if a higher value than the previously displayed value is
measured. The meter goes into the Min-Hold mode when the
"Max/Min" button is activated again. "Min" appears in the display.
The display is only updated if the sound level is below the
displayed value. Max/Min flashes in the display if the "Max/ Min"
button is activated again. The current value is displayed and the
maximum or minimum value is stored in this mode. The maximum
or minimum value is displayed by again activating the "Max Min"
button. The "Max Min" button must be kept pressed for two
seconds in order to quit the Max Min mode. 

The Max-Min mode is cancelled by activating the Level,
Fast/Slow or A/C button.

5. Operation

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