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Digital lter characteristics
11.4 Digital lter characteristics
The U8550, U8551, U8552, U8553, LR8530, LR8531, LR8532, and LR8533 have a digital lter.
The cuto frequency is set automatically based on the measurement module type, number of
channels in use, data refresh interval, power supply frequency lter, and wire break detection
setting.
If you need to reject the power supply’s line frequency, you can obtain a high level of noise rejection
performance by setting the cuto frequency so that it matches the power supply’s line frequency.
For more information about the cuto frequency, see the sections about individual modules’ digital
lters in “10.2 Plug-in Module Specications” (p. 310).
The following gures oer a typical example of the digital lter characteristics for the U8550
Voltage/Temp Module when using a data refresh interval of 10 s:
Cuto frequency: 50 Hz
Frequency (Hz)
Gain (dB)
Cuto frequency: 60 Hz
Frequency (Hz)
Gain (dB)
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