BRUEL & KJAER 2203 Instructions And Applications

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

BRUEL & KJAER 2203 Specifications

General

Brand	BRUEL & KJAER
Model	2203
Category	Measuring Instruments
Language	English