Sthor 81711 Manual Original página 8

EN
be turned off after pressing the power switch again.
Press and hold the power switch for approx. 2 seconds to reduce battery consumption – the
meter will turn off automatically after approx. 10 minutes from the last pressing of the button.
Pressing the HOLD button will save the sound intensity value shown on the display. In this
mode, the HOLD mark will also be visible on the display. Press the HOLD button again to return
to the continuous measurement – the HOLD mark will disappear from the screen.
Pressing the button marked MIN/MAX will result in displaying only the lowest measurement
value. The display will also show the MIN indicator. Another pressing of this button will switch to
displaying only the highest measurement value. The display will also show the MAX indicator.
Press the MIN/MAX button again to return to the instantaneous value measurement.
The meter also allows for setting a value at which a visual alarm, consisting of fl ashing screen
backlight, will be activated. Turn on the meter and press the HOLD button, so that the HOLD
indicator appears on the display. Press and hold the power switch for approx. 2 seconds – the
dBA indicator will disappear from the display and the alarm value will appear on the display.
Use the HOLD and MIN/MAX buttons to set the new value. The HOLD button increases the
alarm value and the MIN/MAX button decreases it. Press and hold the button to change the
value faster. Pressing the power switch will set the alarm to the selected value and return to the
instantaneous value measurement mode.
The meter has a battery charge indicator. If the battery symbol on the display is full, the battery
is fully charged. Gradual discharging of the battery is indicated by the reduction of the number
of icons in the battery symbol. If the battery symbol is empty, the batteries must be replaced
with a new set.
Calibration (II)
The product is factory calibrated and ready for measurement after purchase. However, it is
recommended to calibrate the device at least once a year starting from the day of fi rst use.
Calibration will require a reference sound source with a 1/2'' (12.7 mm) socket emitting a sound
signal with an intensity of 94 dB and a frequency of 1 kHz. The sound source is not included
with the meter and must be purchased separately. Slide the meter's microphone without the
wind guard into the sound source socket. Turn on the meter in the instantaneous measurement
mode. Turn on the sound source so that it emits a reference signal. Adjust the knob in the hous-
ing using a small screwdriver so that the value on the display reads 94.0. Turn off the meter
and the sound source.
Warning! Do not calibrate without the reference sound source. Otherwise, the meter will show
an invalid value.
Maintenance and storage
The product does not require any special maintenance. Clean the housing and the microphone
with a soft and slightly damp cloth. Then wipe the product dry or leave it to dry. Store the product
in the conditions specifi ed in the table. Do not store the product together with other tools, e.g.,
in a toolbox. Protect the product from moisture, dust, and direct sunlight.
O R I G I N A L I N S T R U C T I O N S
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