5-2
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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 fi5 V is loaded, the voltage supplied to the
SCB-68A circuitry and screw terminal 8 decreases. Pad R20, shown in Figure 1-2,
, 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.
