When
subjected
to
extremes
of
humidity
for
considerable lengths
of
time
it
may
be
necessary
to
recalibrate the instrument.
When
not
in
use,
the instrument should be stored in a
dry
place.
8.19. OPERATING TEMPERATURE
8.20. BATTERIES
3 x 1.5
Volts
flash-light cells (Type R
20
in I
EC
Publication
86-2)
8
hours battery
life
for
normal operation.
Means
of
checking battery voltage
provided.
8.21. DIMENSIONS
Length: 56
em
(22 in) including flexible extension rod
and
microphone
33
em
( 14.8 in) meter
with
input
stage.
Width: 12
em
(4.75 in)
Height: 9
em
(3.5 in)
8.22. WEIGHT
With flexible extension rod
and
microphone: 3 kg (6.7 lb).
Meter
with
input
stage:
2.7
kg
(6 lb).
8.23. ACCESSORIES
The
accessories
available
for
the 2209 may
be
seen
in Figs.6.1a and
6.1
b.
Many Couplers, Adaptors
and
Extension Cables suitable
for
various
working
conditions
are
also available. The reader
is
referred
to
the B & K Main
Catalog
for
full
details.
113
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