User manual

Mathematics
R&S
®
RTO
187User Manual 1316.0827.02 ─ 06
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"Cut-Off": sets the limit frequency for the FIR filter.
The cut-off frequency depends on the horizontal resolution. The frequency for the low-
pass filter can be set only in this range:
f_g_3dB = (0.0025 ... 0.1)* f_a_in
Where: f_g_3dB = cut-off frequency to be set for the lowpass filter, and f_a_in = reciprocal
of the resolution, or sample rate.
To check limit frequency for the highpass filter, convert it to an equivalent lowpass fre-
quency:
f_TP = f_a_in/2 - f_HP
Where f_HP is the requested highpass limit frequency and f_TP the equivalent lowpass
frequency that has to comply with the limits given above.
For advanced expression, see table 6-10.
6.2.2 Advanced Expressions
In the Advanced tab, you can enter complex formulas to define a math waveform. The
formula editor helps to enter formulas easily with correct syntax, using a large selection
of operators and signal sources. Double-tap the "Advanced" tab to display the formula
editor.
6.2.2.1 Defining a Formula in the Advanced Formula Editor
1. In the "Math" menu, select "Math Setup".
2. In the "Setup" tab, select the "Advanced" tab.
3. Double-tap the editing area.
The "Formula Editor" is displayed.
4. Enter the math formula including all required signal sources and operators by select-
ing the corresponding keys in the editor. For details on the available keys, see chap-
ter 6.2.2.2, "Advanced Formula Editor", on page 188.
5. To insert a physical unit in the formula, proceed as follows:
a)
If necessary, insert a decimal prefix using the "M/k/µ" key.
b) Insert an opening square bracket using the "[" key.
c)
Insert the physical unit using the "V/A/Ω" key.
Mathematical Functions and Formulas