7.
Set
the
attenuators
of
the
2209
so
that
the
RMS
level
of
the
Cali-
brator
or signal appears on
the
scale.
The
level
is
equivalent
to
RMS
values of:
Acceleration:
Velocity:
Displacement:
6.94
m/sec
2
13.9. 1
o-
3
m/sec
27.7.
1o-6m
(7.07.
10-
1
g)
(5.46.
10-
1
in/sec)
(1.09.
1o-
3
in)
8. With a small screwdriver,
turn
the
GAIN
ADJ
potentiometer
until
the
appropriate meter deflection
is
obtained.
3.3.2. Using
the
built-in Reference Voltage
If
the
Integrator
Type
ZR
0020
is
used (see section 5.2.3)
the
2209
can
be
calibrated
to
read directly acceleration, velocity,
or
displacement. If
the
2209
is
used
without
the
Integrator,
the
accelerometer
input
to
the
meter
is
through
the
adaptor
JJ
2614
supplied,
in
which case acceleration only can
be measured.
In each case, calibration procedure
is
as
follows:
1.
Connect
the
accelerometer
to
the Meter as shown
in
F ig.3. 1.
2. Determine
whether
it
is
required
to
measure acceleration, velocity
or
displacement and
the
units
in
which
the
measurement
is
re-
quired:
Acceleration:
Velocity:
Displacement:
metres/sec
2
g
metres/sec
inches/sec
metres
inches
3. From
the
calibration Chart of
the
accelerometer
to
be used, deter-
mine the voltage sensitivity
in
mV /g, including effects of
the
capacitance
of
the
connecting cable used.
4. From
Table 3.2 select
the
appropriate
attenuator
scale and
fit
it.
5.
Turn
the
meter scale
to
VIBRATION METER.
6. From the chart
in
Fig.3.2 determine
the
Sensitivity Correction.
To
21
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