Non Standard High Pass Filter Options - GE Bently Nevada 3300/25 Operation Manual

Section 19 - Appendix B–Filter Board Options PWA 79562-01 and PWA 105521-01

19.8 Non Standard High Pass Filter Options

Follow this procedure only if the desired high-pass corner frequency is not listed in the
table in the previous section.
1. Select a high-pass corner frequency,
2. Select a value, K, according to this table:
3. Calculate the multiplier value, D, by using this formula:
where
f
is the high-pass corner frequency from step 1
HP
K is the constant selected in step 2
D is the multiplier value
4. Convert D to the closest 8 bit binary integer, D0 to D7.
5. Install/Remove jumpers according to the following table. The jumpers
corresponding to values D0 to D7 are installed according to these rules:
an installed jumper
a removed jumper
K = 1.246
CHANNEL
REMOVE
W11 W31
A
W38 W40
W23 W30
B
W35 W36
If your frequency is within
this range,
3.7 Hz to 318 Hz
319 Hz to 3008 Hz
D =
(D should be in the range 3 to 255)
= 0,
= 1,
K = 11.797
INSTALL
W11 W31
W38 W40
W23 W30
W35 W36
f
, in the range 3.7 Hz to 3008 Hz.
hp
Use this value for K
1.246
11.797
f
HP
K
D0 is the least significant bit (LSB)
D7 is the most significant bit (MSB)
(MSB)
D7 D6 D5
W18 W17 W16 W15 W14 W13 W12 W42
W19 W24 W25 W33 W34 W29 W32 W28
(LSB)
D4 D3 D2 D1 D0
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