GE Bently Nevada 3300/25 - Page 82

3300/25 Dual Accelerometer Input Monitor Operation Manual
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5. Calculate the multiplier value M. In this case:
57.32=
188.19
625
=M
6. Convert M to the closest 8 bit binary integer. The closest integer to 32.57 is 33,
and the 8 bit binary representation is 00100001. M7 is the most significant bit
(MSB), and M0 is the least significant bit (LSB).
7. Set the jumpers for the anti-aliasing corner frequency, f
AA
, according to the Anti-
Aliasing Corner Frequency Jumper Table shown earlier in this section.
On the Filter Board
Install: W70,W71,W72,W73,W75, and W77
Remove: W56,W57,W69, and W74
8. Set the low-pass corner frequency. Step 1 tells you to select a value for clock
frequency f
CLK
beginning with f
CLK
= 3.58 MHZ.
9. Calculate the divider ratio D.
716=
125×40
3580000
=D
10. Look at the Divider Ratio Table to find a match to the divider ratio D that was
calculated above. There is not a match for D = 716 within ±1 in the Divider Ratio
Table so select f
CLK
= 2 MHZ.
11. Calculate D with
f
CLK
= 2 MHZ.
400=
125×40
2000000
=D
There is not a match for D = 400 within ±1 in the Divider Ratio Table so select f
CLK
= 1
MHZ.