connector blocks vs cables

[vikasg]

Don't know if this is the right forum to ask the question, but I will try. 

I am developing an automatic test environment using PXI system for testing an integrated circuit. 

Is is better to route the signals on the test board, and connect the cables to the board, or is it better to buy the connector blocks offered (like NI TBX-50 for PXI-2576)?

I understand the connector block offers flexibility, but I have a very well defined test schematic and since I am automating the tests I do not want the technicians trying to jumper wires from one test to another. 

Any thoughts?

[MorganS · Accepted solution]

Hi vikasg,

It sounds like you have a good understanding of the tradeoffs.  The main benefit of the connector blocks is the flexibility they offer, but if that's not required for your application, I agree that cabling directly to your test board may be the best option.  Not only would that prevent any mis-wiring, as you mentioned, but having fewer connections in your path provides fewer opportunities to introduce noise.  On some switch modules, the connector block determines the topology, but for the PXI-2576 you should be able to use the LFH160 cable straight to your test board.  Just take care to double-check the pinouts!

We also sometimes work with a few companies who create high-density front-end connector panels for PXI systems.  I would suggest working with your local NI sales engineer who can offer some recommendations about whether that might be a good option.  They can also help make sure you have all the hardware you need, whichever route you choose.

Thanks,

Morgan S

Applications Engineer