8
8
9
9
Display Illumination
Press the
Backlit
button to light the display for about 5 seconds. This facilitates
viewing in low light conditions.
Automatic or manual range selection
The meter offers six measurement ranges in steps of 10 dB:
30~80 dB, 40~90 dB, 50~100 dB, 60~110 dB, 70~120 dB, 80~130 dB.
When you turn on the device, it is in automatic range selection mode. The
AUTO indicator appears on the left side of the screen.
The currently selected measuring range can be read on the display by means of
the two digits to the left above the bar display. In addition, it is also possible to
manually set the measurement range. This can be useful to prevent a switcho-
ver of the display during measurement.
UPPER
and
DOWN
keys are provided to set the measurement range manu-
ally. The note ‘MANU’ appears on the display in manual mode. The currently
selected range is shown by the numbers below the bargraph. If the UPPER or
DOWN button is pressed for 2 seconds, the unit returns to the automatic range
selection mode.
In manual range selection mode, the note ‘UNDER’ is displayed if the measured
sound levels are too low for the selected range. On range overrun, the note ‘UP-
PER’ is displayed. In both cases you have to re-select the measurement range to
obtain valid measurements.
Automatic shutdown
After 20 minutes of operation, the meter turns off automatically to conserve
battery power.
This can be changed during powering up the device as follows:
1. First, turn off the unit.
2. Keep the
MAXHLD
button pressed while powering the unit up.
3. Release the
MAXHLD
button when an ‘n’ appears in the display. Thus,
the automatic shutdown function is disabled and the device can only be
switched off with the
ON / OFF
button.
For prolonged measurements, we recommend to use an external power supply.
However, the automatic shutdown function is enabled again at the next power-
ing up.
