iDAQ-817_821 User Manual
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Figure 3.10 Device description shown in Navigator
3.5
Field Application Notes
Here are some notes related to field applications. They are mainly about the consid
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erations of safety, especially the output function in some machine-controlling scenar
-
ios.
3.5.1
DAC Code Change Glitch
When the output voltage or current of an analog output channel changes, glitches
may be observed. This is a normal phenomenon due to released charges of the
DAC. The largest glitches occur when the most significant bit of the DAC code
changes.
To preserve the slew rate and settling time specifications, no further signal condition
-
ing is applied in the device. If the glitches are unacceptable, an external low-pass
deglitching filter can be used to reduce the glitches. However, users should verify that
the frequency response and distortion of the signal due to the deglitching filter can
still meet the requirement of the applications.
3.5.2
Output Status When Changing Range
When analog output range changes, the output voltage or current will reset to 0 and
stay until another software command changes it. This prevents unexpected voltage
or current change when changing output range.
Summary of Contents for iDAQ-817
Page 1: ...User Manual iDAQ 817 iDAQ 821 Analog Input and output Industrial DAQ Modules ...
Page 8: ...iDAQ 817_821 User Manual viii ...
Page 11: ...Chapter 1 1 Start Using iDAQ 817 821 ...
Page 15: ...Chapter 2 2 Installation Guide ...
Page 20: ...iDAQ 817_821 User Manual 10 ...
Page 21: ...Chapter 3 3 Function Details ...
Page 29: ...Appendix A A Specifications ...
Page 33: ...Appendix B B System Dimensions ...
Page 35: ...25 iDAQ 817_821 User Manual Appendix B System Dimensions ...