General Tools and Instruments DSM8921 - Manual (Page 13)

The automatic shutoff feature will
resume the next time the meter is
turned on.
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 compart-
ment cover. Insert a fresh 9V battery
and replace the cover.
To override the Auto Shut Off 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.
"n" will appear on the screen in
one second (See Fig.15) , then
enter the power on mode ; i.e.
count down from:
and then a current sound level
measurement is started.
4 Release the ON/OFF key. The meter
will remain on until the ON/OFF
button is pressed again.
Fig.15
99.9 88.8 77.7 66.6 55.5
44.4 33.3 22.2 11.1 00.0