Voltage Spikes When Using Analog Input Pad in SCB-68A

Updated Mar 24, 2019

Reported In

Hardware

  • SCB-68A
  • PCIe-6321

Software

  • LabVIEW

Driver

  • NI-DAQmx 18.6

Issue Details

I am using analog input pad in the SCB-68A to do signal conditioning. When I do the acquisition with high-frequency signals I notice spikes in my acquisitions.

Why?
 

Solution

Each analog input pad has 8 pin, connected as the following image : 
As you can see there is a 0Ω resistor in the F and G position . You must remove the resistor to use the positions.
if it not removed it is possible to parasitic phenomena, especially with high frequency signal.

Additional Information

To desolder the resistor use a low-wattage soldering iron (20W to 30W). Use only rosin-core electronic-grade solder to avoid damages the printed circuit device and components 
 

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