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Old 19th March 2013, 08:44 PM   #6571
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Originally Posted by Julf View Post
I guess it proves you are better at 1980's technology than at 2010's technology...
You do not need to prove anything for me Julf. You have done more then enough.
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Old 19th March 2013, 10:32 PM   #6572
DeJ is offline DeJ  United States
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Hey everyone, can someone clear this up? In the NC400 guide, figure number 2 for an xlr connection: #1 on the xlr goes to the chassis, #2 and 3 are the pos and neg. And the other wire in the diagram is shown connecting to the chassis…is that the braided shield wire or the nAMPON wire? If it’s the braided shield wire, where does the nAMPON wire attach too?

Question 2, Is the nc400/smps600 grounded to earth? Can someone explain why the nc400 xlr is grounded to the chassis but thesmps600 ice is not?

And finally  question 3, The smps600 has one standoff touching the chassis for EMI reduction. How does that create a drain if the smps600 is not grounded to the ice? Wouldn’t that make the chassis radiate EMI?

Thanks everyone! Looking forward to getting these built!
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Old 20th March 2013, 03:01 PM   #6573
Julf is offline Julf  Europe
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Originally Posted by DeJ View Post
Hey everyone, can someone clear this up? In the NC400 guide, figure number 2 for an xlr connection: #1 on the xlr goes to the chassis, #2 and 3 are the pos and neg. And the other wire in the diagram is shown connecting to the chassis…is that the braided shield wire or the nAMPON wire? If it’s the braided shield wire, where does the nAMPON wire attach too?
It is the braided shield, but you can connect nAMPON to it too, if you don't use nAMPON to swithch the amp off/on.

Quote:
Question 2, Is the nc400/smps600 grounded to earth? Can someone explain why the nc400 xlr is grounded to the chassis but thesmps600 ice is not?
Depends on your definition of "earth". There is a ground plane on the nc400, connected to power supply ground. It can, but does not need to be, connected to chassis, and the chassis can be connected to mains earth, or not. The recommended way is to not connect the chassis to mains earth - but make sure you understand the class II construction implications - otherwise connect safety earth (for safety, not signal use).

Quote:
And finally  question 3, The smps600 has one standoff touching the chassis for EMI reduction. How does that create a drain if the smps600 is not grounded to the ice? Wouldn’t that make the chassis radiate EMI?
I am not sure what "ice" refers to. Why would connecting the smps600 earth to the chassis cause EMI radiation?
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Old 20th March 2013, 03:16 PM   #6574
DeJ is offline DeJ  United States
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oops, ice is a typo. I meant to write, IEC Power Inlet. The thing the power cord attaches too. If the power cord is not grounded then the smps600 is not grounded and the chassis can radiate EMI because there is no ground drain. Right?
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Old 20th March 2013, 03:37 PM   #6575
Julf is offline Julf  Europe
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Originally Posted by DeJ View Post
oops, ice is a typo. I meant to write, IEC Power Inlet. The thing the power cord attaches too. If the power cord is not grounded then the smps600 is not grounded and the chassis can radiate EMI because there is no ground drain. Right?
The smps600 is still grounded to the chassis, and the chassis contains the radiation (not that there is much in the first place). The mains earth connection is there only for electrical safety reasons.
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Old 20th March 2013, 04:00 PM   #6576
DeJ is offline DeJ  United States
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Doesn't the IEC that attaches to the power cord have to be grounded for the smpa600 to be grounded? Thanks.
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Old 20th March 2013, 04:30 PM   #6577
Julf is offline Julf  Europe
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Doesn't the IEC that attaches to the power cord have to be grounded for the smpa600 to be grounded? Thanks.
Depends on your definition of "grounded". There is a common signal ground reference between the boards inside the chassis. That common ground can be connected to mains earth for safety reasons, but it doesn't need to be.

The nc400 input circuit is a differential input, so it doesn't care about ground (OK, to be very precise, it doesn't care about ground very much - the common mode rejection ratio is 55 dB).
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Old 20th March 2013, 04:33 PM   #6578
DeJ is offline DeJ  United States
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Thanks Julf!
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Old 20th March 2013, 08:37 PM   #6579
mangew is offline mangew  Sweden
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A question when i assemble a nc400 amp, shall i groun the XLR connector to the chassi. I see on pictures some seems to do and some doesn´t. And shall the XLR and IEC share grounding point. Some seems to do and some not.

What is to prefer?

Last edited by mangew; 20th March 2013 at 08:58 PM.
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Old 21st March 2013, 12:10 AM   #6580
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For those of us who don't have Class II safety tested components. The IEC Safety Ground should be connected to the chassis near the IEC connector. The XLR Pin 1 should be connected to the chassis at the XLR jack. Typically these connectors are in different areas of the chassis.
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