PXI 2515 to Dut cable connection and proper connection to GND

[Sam_Ajlouni]

Hi all,

I am interfacing a testing board (DIB) to pxi-2515 switch. The switch will connect PXI-4130 SMU & PXI-6552 to the DUT  in order to characterise multiple tests.

I  will use 68-Pin VHDCI connector on my board to connect to 2515 via NI SCH68-C68-D4 cable. I won't be using all the dut channels. Based on the pin diagram http://zone.ni.com/reference/en-XX/help/375472A-01/switch/2515_independent/#MakingAConnection ; How should I connect GND pins from right connector to my board connector?

I am a bit confused, Should I connect all of the GND pins to my board's ground? Or can I choose certain GND pins to connect to my board's ground (since I won't be using all dut channels in the 2515--i.e.do certain GND pins have correspondace with certain dut pins?)?

The left connector in 2515 is connected to PXI-6552 DI/O. Would GND pins in right connector (which connects to DUT) be refrenced to GND through left connector (through the 6552 system ground)? Or should I always connect everything to my DUT system ground?

I would appreciate any clarification!

Thanks,

Sami

[Chris-G · Accepted solution]

Hi Sami,

The PXI-2515 will share the ground line between the DUT and the HSDIO card when using the GND lines. All the GND pins share the same physical ground, so it shouldn't matter which pin you use for each channel. Just make sure you have each DUT's ground wired to a GND pin. Typically there are multiple GND pins distributed across the connector simply to allow easy access to the ground from multiple channels without having to connect multiple wires into one ground pin.

Does that make better sense?

Hopefully this helps.

Chris G

[Sam_Ajlouni]

Thanks u very much Chris. Knowing that the GND is shared Clarified everything for me. 🙂