10 ISSUED: June 2013 923134 Rev A
In the setup of these filters, you have control of cutoff frequencies, transition region width, and
stop band attenuation.
FILTER SETUP
To Set Up a DFP Filter
1. Touch Math in the menu bar then Math Setup... in the drop-down menu.
2. Touch the Fx tab (F1
for example) for the math trace you want to display
your filtered
waveform.
3. T
ouch the Single function
button
if you want to perform just one filtering function on
the trace, or touch the Dual function button
to perform math on, or apply another
filter to, the filter output.
4.
Touch inside the Source1 field and select a source waveform from the pop-up m
enu.
5.
Touch inside the Operaor1 field and select
Filter
from the pop-up menu. A mini-dialog
to set up the filter will open at right.
Note: Other math choices in the Operator1 menu include Boxcar, ERES, and interpolation. The boxcar "filter" is a simple
average taken over a user-specified number of points (the "length").
6. Touch inside the FIR/IIR field and select finite or infinite response filter FIR (non-recursive)
filters require a limited number of multiplications, additions, and memory location
s. On the
other ha
nd, IIR (recursive) filters, which are dependent on previous input or output values, in
theory require an infinite number
of each..
7.
Whether you selected FIR or IIR, touch inside the Filter Kind field and sele
ct a filtering
operation. So
me choices are not availabl
e for IIR.
8.
If you selected FIR, touch inside the Type field and choose an FIR filter type.
Then touch
insid
e the Taps
2
data entry field and enter a value, using the pop-up numeric keypad.
Alternatively
, you can touch the Auto Length checkbox; the Taps field is grayed
out and the
scope
calculates the optimum number of coefficients. If you selected IIR, touch inside
the
Ty
pe field and choose an IIR filter type. Then touch inside the Stages data en
try field and
enter a value,
using the pop-up numeric keypad. Alternatively, you can touch the
Auto
Length ch
eckbox; the Stages field is grayed out and the scope calculates the op
timum
numbe
r of sta
ges.
2
The number of coefficients. The number of coefficients. The suggested number of taps is a minimal suggestion: using
even more taps can give a more desirable response. Using less than the suggested number of taps will not meet the
requested specifications.
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