National-instruments Module NI PXI-8250 Instrukcja Użytkownika Pobierz pdf (Strona 24)

Chapter 3 Hardware Overview

NI PXI-8250 User Manual 3-8 ni.com

The NI PXI-8250 has self-resetting fuses rated at 1 A/125 V on the front

end and one-blow fuses rated at 4 A/125 V on the back end of the card to

protect the card from excessive current draw. Refer to Figure 3-1 for the

locations of these fuses.

When current is exceeded on any of the rails (the current limits are provided

in Table 3-2), the self-resetting fuses will open the circuit. These fuses are

designed to reset themselves and do not need to be repaired.

As a fail-safe, one blow fuses have also been added to ensure that excessive

current is stopped if a self-resetting fuse fails to operate properly. In the

event that any of the one-blow fuses blow, the board must be returned for

repair.

Table 3-2. Fused Power Output Ratings

Voltage R a i l Maximum Allowed Current Draw

+5.0 V 0.75 A

+3.3 V 0.75 A

+12.0 V 0.25 A

–12.0 V 0.25 A

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 38 39

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National-instruments Module NI PXI-8250 Instrukcja Użytkownika Strona 24