5V power supply at SCB 68 from PCI 6602?

[hanh]

I want to check my new counter-timer NI PCI 6002. It seems all OK but the 5v power supply ( pin 1- SCB 68 -TIO devices) is not available?

[Kevin_Price]

This is probably due to either a jumper setting inside the SCB-68, or possibly a blown fuse in there.  The default jumper settings on those boxes are usually configured for the multifunction boards.  The only time I've received one factory-configured for the 6602 was when the 6602 was the *only* DAQ board in the same order.  And that has always seemed reasonable.  In fact, I was rather surprised that it *ever* got pre-configured for the 6602, and wouldn't count on that being a standard policy.

Anyway, here's a link to the manual.

-Kevin P.

[hanh]

I have check the fuse and all setting jumpers inside SCB68 ( SCB68- Quick Reference label TIOP device). All are OK but 5v supply is not available. (I even check the voltage at the fuse : 0V!!)? Are there jumpers on the 6602 card? I use a new cable as required.

[Kevin_Price]

If the DIP switches are set to have accessory power disabled, it may well make sense that you see 0V at the fuse.  Sorry, don't know what else to suggest.  Anyone else?

-Kevin P.

[Steve_B]

Hi hanh,

Be sure you are referencing the +5V power to the DGND as it is specified in the 6602 Manual on page 3-18. I verified that the connection is available on the SCB 68.

NI 660x User Manual
http://www.ni.com/pdf/manuals/372119a.pdf

[hanh]

I used  my SCB 68 with a DAQ card before, 5v supply is OK. Now I use it with new card PCI 6602 ( with standard  cable for PCI 6602) , I can't use 5V supply. It is not a big problem, but I am afraid of the quality of the new card or the new cable?

I have read on SCB-68 circuit diagram (D-1) : the 5v supply must be present before the fuse.

By the way, can you explain me about " self-resetting fuse" (NI6602 manual).

Thanks

[Kevin_Price]

Dunno about the "self-resetting" fuse.

You *do* realize that the pin for +5V from a 6602 (pin 1) is different than the pin for +5V on, for example, multifunction boards (pin 8 I think), right?.  This stuff is all in the manual linked earlier.

-Kevin P.

[Steve_B]

Hi hanh,

Here is some additional information about the self-resetting fuse and some possible issue that may relate to what you are experiencing. Does your card function properly when you use it?

Self-Resetting Fuse Additional Information
http://digital.ni.com/public.nsf/allkb/E48B7DDC4EA9DE0886257333005C28FE?OpenDocument

[hanh]

I have checked one of its main function (NI6602): generation of train pulse (using Measurement &Automation): it worked well.

[Steve_B]

Hi hanh,

If the card seems to function properly it seems like an issue with the fuse. Are you able to use a different cable or breakout connector to verify the same results? Were you able to follow the testing described in the KnowledgeBase article from my previous post. You could use a resistance measurement to be sure that the fuses and connections are valid the +5V line.