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Troubleshooting Blown Fuses for Bus-Powered M Series Multifunction DAQ

Hardware: PXI/CompactPCI>>Controllers

Problem:
How do I replace the blown fuses on my Bus-Powered M Series Multifunction DAQ (USB-621x)?

Solution:
There are three types of USB-621x DAQ device:

1. Screw Terminal devices: 6210, 6211,6212, 6215, 6216, 6218
2. Mass Termination devices: 6212, 6216
3. BNC devices: 6212, 6216, 6218

USB-621x Screw Terminal/BNC devices have a 350 mA self-resetting fuse that opens when the current exceeds this specification. Although the fuse is self-resetting, there is a finite number of self-resets that can occur before the fuse permanently fails. Therefore, a user can have an incorrect setup and constantly exceed the current limits. These fuses are not customer-replaceable and user should return the device to NI for repair.

USB-621x Mass Termination devices have a 750 mA self-replaceable socketed fuse (Littelfuse part number 0453.750). Steps to replace the fuse are outlined in the NI USB-621x User Manual.

Related Links:
NI USB-621x User Manual
NI USB-621x Specifications
Bus-Powered M Series Multifunction DAQ for USB Support
Littelfuse Homepage
KnowledgeBase 4C9A04N: Self-Resetting Fuse Addtional Information

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Report Date: 04/30/2008
Last Updated: 12/14/2009
Document ID: 4KTD5EJQ

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