In metric mode, the only airflow volume unit available is cms
(an abbreviation of cubic meters per second, or m
3
/sec).
Pressing the SEL: MPH KNOTS button repeatedly cycles the
air speed units through three available settings: m/s (the
default), km/h and knots. To change the default metric air
speed measurement unit from m/s to km/h (kilometers per
hour or kmph), press the SEL: MPH KNOTS button once.
Press it again to change the default air speed unit to knots.
To return to displaying measurements in Imperial and
Fahrenheit units, power the meter off and repeat the
bulleted procedure above, adding the following step: After
pressing the HOLD button to make the ft/m and °F
indications disappear, press the HOLD button again. This
replaces the m/s and °C indications with the factory-default
values ft/m and °F.
DISABLING AUTO POWER OFF
To avoid wasting battery charge, the DCFM8906 is
programmed to power off automatically after 20 minutes of
inactivity. Just before this function takes effect, the beeper
will sound three times.
There are times when it is desirable to disable the auto power
off function—for example, to enable recording of air speed or
airflow volume readings for more than 20 minutes.
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