National Instruments 24-bit User Manual download pdf (Page 19)

rate. The stopband rejection is the minimum amount of attenuation

applied by the filter to all signals with frequencies within the

stopband.

Alias-Free Bandwidth

Any signal that appears in the alias-free bandwidth of the NI 9237

is not an aliased artifact of signals at a higher frequency. The

alias-free bandwidth is defined by the ability of the filter to reject

frequencies above the stopband frequency and equals the data rate

minus the stopband frequency.

Understanding NI 9237 Data Rates

The frequency of a master timebase (f

) controls the data rate (f

)

of the NI 9237. The NI 9237 includes an internal master timebase

with a frequency of 12.8 MHz, but the module also can accept an

external master timebase or export its own master timebase. To

synchronize the data rate of an NI 9237 with other modules that use

master timebases to control sampling, all of the modules must

share a single master timebase source. Refer to the software help

for information about configuring the master timebase source for

the NI 9237. Visit

ni.com/info and enter cseriesdoc for

information about C Series documentation.

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National Instruments 24-bit User Manual Page 19