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Chapter 2 Function Generator Operation
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National Instruments Corporation 2-13 NI 5401 User Manual
Analog Filter Correction
The NI5401 can correct for slight deviations in the flatness of the
frequency characteristic of the analog lowpass filter in its passband, as
shown in Figure2-13. Curve A shows a typical lowpass filter curve. The
response of the filter is stored in an onboard EEPROM in 1 MHz
increments up to 16 MHz. CurveC is the correction applied to the
frequency response. The resulting CurveB is a flat response over the entire
passband. If you want to generate a sine wave at a particular frequency with
filter correction applied, you have to specify that frequency through your
software.
Figure 2-13.
Analog Filter Correction
Note
You can change the filter frequency correction at any time during waveform
generation.
A
B
C
Frequency (MHz)
Gain (dB)
A. Typical Analog Filter Characteristics
B. Corrected Filter Characteristics
C. Correction Applied