Keysight EXG and MXG X-Series Signal Generators User’s Guide 225
Basic Digital Operation for N5172B/82B with Options 653/655/656/657
Modifying a FIR Filter Using the FIR Table Editor
Modifying a FIR Filter Using the FIR Table Editor
FIR filters stored in signal generator memory can easily be modified using the FIR table editor. You
can load the FIR table editor with coefficient values from user–defined FIR files stored in non–
volatile memory or from one of the default FIR filters. Then you can modify the values and store the
new files.
Loading the Default Gaussian FIR File
Figure 8-23 Loading the Default Gaussian FIR File
1. Press Preset.
2. Press Mode > Dual ARB > Arb Setup > More > Real-Time Modulation Filter > Define User FIR >
More > Load Default FIR > Gaussian.
3. Press Filter BbT > 0.300 > Enter.
4. Press Filter Symbols > 8 > Enter.
5. Press Generate.
6. Press Display Filter > Display Impulse Response (refer to Figure 8-24).
The actual oversample ratio during modulation is automatically selected
by the instrument. A value between 4 and 16 is chosen dependent on the
symbol rate, the number of bits per symbol of the modulation type, and
the number of symbols.
Mode > Dual ARB > Arb Setup > More > Real-Time
Modulation Filter
These softkeys select a
window function
(apodization function) for
a filter.
For details on each key, use key help as described on page56.
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