NI PXI/PCI-5401/5411/5431
Analog Filter Correction

NI signal generators can correct for slight deviations in the flatness of the frequency characteristic of the analog lowpass filter in its passband, as shown in the following figure.

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 for NI PXI/PCI-5401/5411
• 8 MHz for NI PXI/PCI-5431

Curve C is the correction applied to the frequency response. The resulting curve B 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 must specify that frequency through the software.

Note  You can change the filter frequency correction at any time during waveform generation.