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© National Instruments
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5-1
5
Fuse and Power Information
Refer to the
Soldering and Desoldering Components on the SCB-68A
Getting Started with the SCB-68A
, for more information about adding components and for
soldering and desoldering instructions.
Power Supply Circuitry
Figure 5-1 shows the power supply circuitry on the SCB-68A.
Figure 5-1.
+5 V Power Supply
Fuse
Some DAQ devices p5 V power on pin 8 and pin 14. Pin 8 from the DAQ device is
protected by a 1 A self-resetting fuse, shown in Figure 1-2,
. Shorting pin 8 to ground trips the fuse on the SCB-68A. Pin 14 is
not
fuse-protected
on the SCB-68A. Shorting pin 14 will cause the fuse on the DAQ device to open.
If the SCB-68A does not work when you power on the DAQ device, check the switch settings
on the SCB-68A and the output fuse (if any) on the DAQ device.
+5 V
(I/O Pin
8
)
+5 V
S
crew Termin
a
l
ACC Not Powered
(NC)
C2
(10
μ
F)
F1
1 A
S
2.2
ACC Powered
C1
(0.1
μ
F)
R20
(Option
a
l)
R21
C6
(10
μ
F)
C4
(0.1
μ
F)
+5 V
Non-MIO
(NC)
MIO
D GND
(I/O Pin 7)
D GND
S
crew Termin
a
l
Non-MIO
(NC)
MIO
AI GND
(I/O Pin 56)
AI GND
S
crew Termin
a
l
AI
AI
AI
S
2.
3
S
2.1