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BRUEL & KJAER 2203 Instructions And Applications

BRUEL & KJAER 2203
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without
overdeflection.
(The INPUT ATTENUATOR
should
not
be ad-
justed
at
this
stage
since
it
may
result
in
input
overload).
8. Note
the
reading
in
dB
(which
is
the
sum
of
the
meter
deflection
and
attenuator
setting).
This
reading
is used
to
calculate
the
vibration
le-
vel
as described in
the
following
section.
3.6.
CALCULATION
OF
VIBRATION
AMPLITUDE
The dB level
measured
is
converted
to
a
vibration
amplitude
by a
method
determined
by
the
calibration
method
and
whether
or
not
the
In-
tegrator
was
used. A
slide
rule
to
convert
dB
to
vibration
units
is
pro-
vided
with
the
Integrator
ZR
0020.
This
slide
rule
has
two
similar
sides
with
the
vibration
units
on
one
side
being
in
m/s
2
,
m/s,
and m and
the
other
side
in
g,
in
/ s, and in .
3.6.1.
With
4291
Calibration,
Without
Integrator
Determine
the
acceleration
level (A)
in
dB
referenced
to
1 g RMS by:
A=M-Z
where
M =
measured
value
on
2203
(dB)
Z = zero
reference
level
(from
Section
3.4.
1 step 9)
From
Table
3.2
convert
A
from
dB
to
a
ratio
(T).
Then
vibration
ampli-
tude
=
RT
(where
R is
the
reference
vibration
amplitude
defined
in
Sec-
tion
3.4.1
step
9).
Example:
The
zero
reference
level (Z) is 1
00
dB.
The
measured
value
(M) on
the
2203
is
87,4
dB, and
it
is desired
to
find
acceleration
in
m/ s
2
.
M-Z=
87,4-100=-12,6dB=A
A is
converted
to
a
ratio
T =
0,2344
by Table 3.2.
Then
the
Acceleration=
RT
=
(9,8
m/s
2
)
x
0,2344
=
2,30
m/s
2
If
Slide
Rule
QH
0001
is available,
the
calculation
is made as de-
scribed
in
the
following
section.
21

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BRUEL & KJAER 2203 Specifications

General IconGeneral
BrandBRUEL & KJAER
Model2203
CategoryMeasuring Instruments
LanguageEnglish

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