Section 19 - Appendix B–Filter Board Options PWA 79562-01 and PWA 105521-01
63
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,
f
hp
, in the range 3.7 Hz to 3008 Hz.
2.
Select a value,
K
, according to this table:
If your frequency is within
this range,
Use this value for
K
3.7 Hz to 318 Hz
1.246
319 Hz to 3008 Hz
11.797
3.
Calculate the multiplier value, D, by using this formula:
K
f
=
D
HP
where
f
HP
is the high-pass corner frequency from step 1
K is the constant selected in step 2
D is the multiplier value (D should be in the range 3 to 255)
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
= 0,
D0 is the least significant bit (
LSB
)
a removed jumper
= 1,
D7 is the most significant bit (
MSB
)
CHANNEL
K = 1.246
REMOVE
K = 11.797
INSTALL
(MSB) (LSB)
D7 D6 D5 D4 D3 D2 D1 D0
A
W11 W31
W38 W40
W11 W31
W38 W40
W18 W17 W16 W15 W14 W13 W12 W42
B
W23 W30
W35 W36
W23 W30
W35 W36
W19 W24 W25 W33 W34 W29 W32 W28
