SMU guard connections

Hi all

I moved this question here because it is a more appropriate Board.

I'm looking for measurements of current weak on my HAD and therefore seeks to including the guard on my DUT PCB assessment cables. I have two related questions on this issue.

1: the pinout of my SMU-4141 said that there are two pins on guard and I verified this with a DMM, they are linked and lead to the same level as the channel HI. However the cable recommended DB25F-DB25F low leakage cable only has one of these pins connected through guard. Is this correct or is there an error with my cable? I checked all 4 channels and they are all the same.

2: anyone know of any good information / best practices for custody of follow-up on my circuit board?

Thank you all,

Nick

Hi Nick,

Yes thank you, very good, moved to AE a year ago to SRI.

In order to have a reflection and a look at the wiring diagram (which I'm sorry to say that I can't send you in its entirety) and I think I can help with the confusion.

The cable we're actually talking about is not composed of coaxial cables, it is composed of twisted with son of drain and a pair conductive sheath. The son of drain are inert and not get connected to anything, so, leaving twisted pair and their sheaths. There are 8 twisted pairs and gaines in the bundle that gets wired on this connector, which means that 24 potential connections, with pin 13 no wired what whether that make up the number to 25.

Now bear with me I'm sure it's logical: twisted pair number is wired to the pins 2 and 14, which are the two pins of HI for channel 0 in and out. The shield for this twisted pair is then connected to pin 1 (a guard PIN). While guard pin protects both the two pins of HI.

Twisted pair two is connected as well: one half of the twisted pair is connected to pin 3 (LO sense), the other half is not connected and the shield is connected to pin 16. Now if I understand correctly, the son LO need not so much caretaking, so the extra yarn I guess looks more like a thread of drain here.

The schema for the cabling continues like this. Half twisted pair are the SIH strength and direction for a channel that is guarded by a shield wired to an agent, and the other half are wired with LOs and an additional drain.

I don't know why we didn't use COAX when help files, explains using the COAXIAL cable, but I suspect is has something to do with the cost (one of the AEs who graduated from the electrical eng said COAXIAL is much more expensive than the sons of the twisted pair, but he said also it is much more difficult to disassemble to weld so I suppose it would make many of these cable manufacturing) very expensive and difficult).

Now with regard to PCB stuff, I'll be honest, it's not some thing that we have a lot of documentation OR on, but of what google tells me, guard lines can be incorporated in a KIC and from what we have seen in the cable, it looks like we want to keep the HFD for both strength and sense. I myself am a physical grad for PCB design is not something that I've had too much experience with.

What is the next CSLUG meeting (also like the mascot of the group, sea slugs are beautiful!)? I introduce the CLD Summit in early September at the Newbury office if you go to that?

Thank you

Viv

Tags: NI Products

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