Setting The Low-Pass Corner Frequency - GE Bently Nevada 3300/25 Operation Manual

3300/25 Dual Accelerometer Input Monitor Operation Manual
19.11.2

Setting the Low-Pass Corner Frequency

1) Select a value for clock frequency (fCLK) from this list. We recommend that you
start with 3.58 MHZ.
2) Calculate the divider ratio D using this equation. is The clock frequency, f
is selected in step 1 and f
3) Choose the value for the divider ratio in this list that is closest to the value for D
that you calculated in step 2.
4
5
6
9
10
12
14
15
CONDITION
If the value for the divider ratio from the list
in step 3 is...
within ±1 of the value calculated in step 2
not within ±1 of the value calculated in step
2
If you cannot find values for f
give the low pass frequency you need...
72
is the desired low pass corner frequency (in Hz).
LP
MHZ
3.58
2
1
D =
16 27 35
18 28 36
20 29 37
22 30 38
23 31 39
24 32 40
25 33 41
26 34 43
and D that
CLK
kHz
500
250
125
f
CLK
40 f ×
LP
44 58 85
45 60 87
46 61 89
47 64 90
50 69 99
52 74 112
53 78 128
56 81 149
ACTION
set the jumpers for the low pass
corner frequency by continuing with
steps 4 and 5.
choose the next lower value for clock
frequency in the table from step 1
and repeat steps 2 and 3.
use the clock frequency and divider
ratio that gives a low-pass corner
frequency that is closest to the
corner frequency you need.
, (in Hz)
CLK
179
188
224
298
358
447
895
2048