Data Translation DT9824, User Manual, Page: 86 / 102

Appendix A
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Figure 19 shows the frequency response using a sampling rate of 4800 Samples/s.
Figure 19: Frequency Response of the DT9824 When Using a Sampling Rate of 4800 Samples/s
As you can see, the frequency response of the DT9824 gently rolls off from DC due to the
filtering of the Sigma-Delta A/D converter. You can use software to apply a correction factor
to the acquired data to compensate for the filter response of the A/D converter. The correction
factor depends on the input frequency of the signal you are trying to measure and the
sampling rate of the DT9824.
Table 25 shows the gain correction factors for typical input
frequencies and sampling rates.
–3 dB point = 1104 Hz