Reflected Signal Appears in Subsequent Channel When Using Voltage Divider

Updated Jun 15, 2018

Reported In

Hardware

  • NI-9205

Software

  • LabVIEW

Driver

  • NI-DAQmx

Issue Details

I am using a voltage divider in order to adapt my signal to the DAQ board channel range. I am seeing a voltage reflected in the subsequent channel. How can I remove this effect?

Solution

This is happening because the source impedance is higher than 10kOhm and this is generating the ghosting effect in the multiplexed DAQ board. A workarofund for this issue is to adapt the voltage divider to the channels using a voltage follower or trying to reduce the source impedance.

Additional Information

The ghosting effect is a known effect that only happens in Multifunction DAQs with multiplexed ADC. Find more information about ghosting and how to remove its effect in the related links.

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