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Chapter 5 Fuse and Power Information
Adding Power Filters
Caution If you are modifying the power filter, do not draw ≥100 mA from the +5 V
power line.
A 470 Ω series resistor (R21) is part of the power filter for the +5 V power on the SCB-68A.
Due to the nature of the filter design, as the filtered +5 V is loaded, the voltage supplied to the
SCB-68A circuitry and screw terminal 8 decreases. Pad R20, shown in Figure 1-2, SCB-68A
Printed Circuit Board Diagram, is in parallel with R21. You can install a resistor, if needed, to
decrease the overall resistance used in the filter and reduce the loading effect. However,
completely shorting R20 bypasses the filter while capacitively coupling D GND to AI GND and
AO GND and is not recommended.
Caution Add components at your own risk. NI is not liable for any damage
resulting from improperly added components.
Caution NI is not liable for any device damage resulting from improper use of the
SCB-68A and the DAQ device.
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