Oscilloscope R eference Enter a math expression
An example of file content for a normalized filter is shown below. This example is the contents of the
smooth5.flt file:
@ 0 .2, 0.2, 0.2, 0.2, 0.2
An example of a filter that is setup to operate at a specificsamplerateisgivenasfollows. Thisis
the contents of a file named 200MHz_mult_sample_rates.flt that is included in the library directory on
the oscilloscope.
#This is a 4th ord er Bessel Thompsen low pass filter.
#200MHz bandwidth, will operate at any of the following sa mple rates:
# 4 0 GS/s, 2 0 GS/s, 1 0 GS/s, 5 GS/s, 2.5 GS/s , 1 GS/s, 500 MS/s
5e8; 1.968e-007,1.008,-0.00978,0.002267,- 0.0002208,1.643 e-005,-1.397e-
006,1.434e-007
1e9; 9.524e-008,0.3899,0.4877,0.1304,-0.0 04733,-0.004566 ,………………………….
2.5e9; 3.868e-008,0.01885,0.1081,0.1982,0 .2284,0.1981,…… ………………
…
5e9; 1.935e008,0.0007332, 0.009428, 0.02874, 0.05 408, 0.07921, … …………………….
1e10; 9.673e-009,3.445e-006,0.0003666,0.0 01831,0.004714, 0.008978,0.01437 ,0………
……….
2e10; 4.837e-009, 1 .657e-008, 1.723e-006, 4.274e-005, 0.00018334-009, ……………….
4e10; 2.418e-009, - 3.524e-009, 8.284e-009, -1.795e-008,8.613e-007 , ……………….
Enter a math expression
From the Math menu, select Equation Editor, or click the Editor button in the Math Setup or Spectral
Setup control windows.
To use
Select a Math <1-4> waveform from the drop-down list.
Click in the readout fieldtoenterthemathexpression.
Click a button to enter its character or operator into the expression.
Click the Editor button and use the Math Equation Editor controls to insert numerals, math operators,
and variables into a math expression.
Use the Text Edit Controls (see page 259) to move the insertion point (cursor) within the expression.
Behavior
The characters are entered into the math expression one at a time.
What do you want to do next?
Learn about the Math Setup controls. (see page 241)
Learn about averaging math waveforms. (see page 241)
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 865
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