3. Fit
the
instrument with
the
plug-in
Input
Stage. Extension Rod,
any
Microphone
Adaptor
required and
the
Microphone
with
its normal
protection grid.
4.
Turn
the
METER SWITCH
to
"Batt.
(Rec.)"
and check
the
condition
of
the
batteries.
5.
Set
the
METER SWITCH
to
"Fast",
WEIGHTING NETWORK switch
to
"C",
and
the
ATTENUATOR switch
to
a suitable range
for
the
calibration source used.
6. Place
the
Pistonphone or
Sound
Level Calibrator over
the
Micro-
phone, ensure
that
it
is
firmly seated, and switch
on
the
calibrator.
7. Using a
small screwdriver, adjust
the
GAl N
ADJ
potentiometer
until
the
meter indicates
the
correct
sound pressure level according
to
the
calibration
chart
of
the
calibrator (corrected where necessary
for
atmospheric pressure).
3.1.2. Using
the
built-in Reference Voltage
16
1.
Turn
the
Meter Scale
to
PRECISION SOUND LEVEL METER.
2.
Fit
the
Attenuator
Scale
appropriate
to
the
sensitivity
of
the
Micro-
phone
in
use. Choose
the
appropriate
scale
from
Table 3.1.
3. Fit
the
instrument
with
the
plug-in
Input
Stage, Extension Rod,
any
Microphone
Adaptor
required and
the
Microphone.
Any
microphone
accessories
to
be
used may remain
in
position.
4.
Turn
the
METER SWITCH
to
"Batt.
(Rec.)"
and check
the
condition
of
the
batteries.
5.
Set
the
METER SWITCH
to
"Fast",
WEIGHTING NETWORK switch
to
"Lin",
and
the
ATTENUATOR switches so
the
"Ref"
appears
between
the
red lines
on
the
transparent
knob.
6.
From
the
calibration
chart
of
the
microphone
in
use,
determine
its
Open
Circuit Sensitivity
in
mV per
N/m
2
.
7. Using a small screwdriver, adjust
the
GAl N
ADJ
potentiometer
until
the
Open Circuit Sensitivity
of
the
microphone
in
use
is
correctly
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