5.
Orient the accelerometer VERTICALLY AT REST, to create a state of “gravitational
acceleration” (= 1 g).
6.
Enter a
FORCE (FRC)
command of
FRC y = 1.00 [CR]
7.
You must now determine the high-pass filter gain that includes the desired full
scale. Note that the effective full scale for the vibratory component of acceleration
is given by
A
•
m
g
You must therefore select from the following table a value of the factor “m
g
” which,
when multiplied by the full-scale acceleration “A,” includes the highest expected
vibration reading.
Table 3
High-Pass
“m
g
”
Filter Gain
1.414
1
0.707
2
0.2828
5
0.1414
10
0.0707
20
For example, if A = 100 (g), and you expect a vibration reading of up to 25 (g), you
should select the “m
g
” value of “0.2828,” since 100 x 0.2828 = 28.28.
8.
Referring to the above table and the instructions given in Section 3.b, set the
10A76 to the high-pass filter gain that corresponds to the selected “m
g
” value. For
the example in Step 7, this would be “5.”
9.
Command
EMM y [CR]
and note the answer. This is “m
y
,” the scaling factor you “forced” into Channel No.
y in Step 6.
10. Now set the “m” coefficient of Channel No. x (“Vibratory Component”) by com-
manding
EMM x = m
x
[CR]
where the value you enter for “m
x
” is
m
g
•
m
y
(“m
g
” is the factor you selected in Step 7; “m
y
” is the answer from Step 9).
10A76.
6
S
ETUP AND
/
OR
O
PERATING
C
ONSIDERATIONS
10A76
V
IBRATION
C
ARD
Summary of Contents for System 10
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