In
most
circumstances air velocity measurements are displayed as soon as the
appropri-
ate pushkey is activated. However,
if
an AIR VELOCITY pushkey is activated immedi-
ately after the self-test program has been completed a
MEA
SUR
I
HG
message will
appear on the Display. As soon as the
first
5-second
value is obtained the Display
changes
to
give the calculated
5-second
value on the left-hand side
of
the Display. The
+ + + + m
Is
on the
right-hand
side
of
the Display will be replaced by the
3-minute
value
as soon as the first measurement
of
this has been obtained.
The
Air
Velocity Transducer is an omnidirectional sensor. However, the accuracy
of
measurements in a 15° solid angle about the handle
of
the Transducer (see Fig. 4.5) is
reduced. Therefore, this solid angle should be oriented away from the direction
of
any
distinctly noticeable air movement. Accuracy
of
the
Air
Velocity Transducer will also be
reduced
if
the Transducer is hand-held as opposed to being mounted on a tripod.
Accuracy applies to
full sphere
except
a
small
15
° solid angle
about the transducer
handle
841213
Fig. 4.5.
Solid
angle
about
the long axis
of
the
Air
Velocity Transducer
in which accuracy is reduced
35
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