Automatic Shutoff; Replacing The Battery - Wohler SP 22 Bedienungsanleitung

Manual instruction
3. Operation
2.9 Selecting Automatic and Manual Ranging
The meter features six measurement ranges in 10 dB steps: 30-80 dB, 40-90 dB, 50-100
dB, 60-110 dB, 70-120 dB, 80-130 dB.
When you turn the meter on, it will be in automatic range mode and a small AUTO will be
displayed on the left side of the screen. In this mode, the meter will adjust the measurement
range automatically for accuracy. The two digit number to the left of the bar graph on the
LCD will show the low end of the current range.
You can also set the range manually. This is helpful when you know the measurement
range in advance. The meter will be able to take readings more quickly, because the unit
does not need to first establish the range before displaying the measurement.
To adjust the range manually:
1. When measuring sound levels, press the DOWN and UPPER keys as needed to adjust
the measurement range. MANU will appear on the display. Note that the two digit number
to the left of the bar graph will change to reflect the low of the newly selelcted range.
2. Press and hold the DOWN and UPPER key to switch back to automatic ranging.
If the meter is operating in manual range and UNDR is displayed, the sound is too low for
the range. If UPPER is displayed, the sound is too loud. In either case, you must adjust the
measurement range or your readings will be anaccurate.

2.10 Automatic Shutoff

The meter will turn off automatically after 20 minutes to presserve the battery.
To override this feature:
1. Make sure the unit is turned off.
2. Press the ON/OFF and MAXHLD buttons simultaneously.
3. When the full display appears, release the MAXHLD button first.
4. Release the ON/OFF key. The meter will remain on until the ON/OFF button is pressed
again.
The automatic shutoff feature will resume the next time the meter is turned on.

3. Replacing the Battery

When the entire display flashes, the 9V battery has fallen to a critically low voltage level
and should be replaced as soon as possible. Use a screwdriver to unscrew the back
battery compartment cover. Insert a fresh 9V battery and replace the cover.
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