Power Off (APO) function is activated. The APO function is disabled when
operating in Min/Max recording mode (see next section).
To make a measurement
, position the vane at the top of the meter
perpendicular to the source of air or wind. Allow time for the reading to
stabilize. It makes no difference whether the front of back of the vane faces
the wind or air flow.
To hold any reading
(“freeze” the display), press the
Hold
button. To release
the hold and resume displaying real-time values, press the
Hold
button again.
This function is very useful for making measurements in low light or when the
source of air or wind is above your head, below your knees or around a corner.
You can make a measurement, hold it, and then read the display up to
10 minutes later after positioning the LCD at eye level.
RECORDING AND DISPLAYING
MAXIMUM AND MINIMUM SPEEDS
The DAF800 can record the maximum and minimum (fastest and slowest) air
speed values measured over a user-selectable period of time. The Min/Max
recording function is handy for noting fluctuations in the output of a fan over
time.
During these recording sessions, the meter’s Auto Power Off function is
disabled to enable recording for longer than 10 minutes. The only limit on
recording duration is remaining battery life.
To begin recording Max and Min readings
, first position the vane in the flow of
air or wind and then press the
Max./Min.
button on the right side of the front
panel. If you begin recording before positioning the vane, your Min. reading will
always be recorded as
0.0
(zero).
Pressing the
Max./Min.
button will cause the term
REC
to appear at the top left
of the LCD. The meter will continue to record Max and Min values—but display
real-time values—until you press the
Max./Min.
button again.
To display the maximum air speed
measured during the current recording
session, briefly press the
Max./Min.
button. (
Do not
press and hold the button;
this will stop recording). The LCD will display the maximum value below the
term
Max
on the top line.
5
