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Scope PCB probe

  • Thread starter Habib Bouaziz-Viallet
  • Start date
T

tm

Jan 1, 1970
0
Habib Bouaziz-Viallet said:
Hi all,

I'm seeking about this kind of PCB test jack described (page5 Fig.11) in
this document :

http://www.analog.com/library/analogdialogue/archives/41-03/time_domain.pdf

I would be very grateful if someone could point me where i can purchase
them.

Best Regards, Habib.

Those were made by Tektronix. You might try Qservice in Rhodes, Gr.
These are HP's version:
http://www.ebay.com/itm/4-PCS-HP-Ag...ultDomain_0&hash=item589ad8414b#ht_2078wt_911


Also, here are some:
http://www.ebay.com/itm/Tektronix-1...ultDomain_0&hash=item460cca7a16#ht_1686wt_818



tm
 
H

Habib Bouaziz-Viallet

Jan 1, 1970
0
Those were made by Tektronix

Thank you but i'll manage with John Larkin suggestion. We may need many
of these PCB tests connectors (several hundred) and long term support.

Best Regards, H.
 
T

tm

Jan 1, 1970
0
Habib Bouaziz-Viallet said:
Thank you but i'll manage with John Larkin suggestion. We may need many of
these PCB tests connectors (several hundred) and long term support.

Best Regards, H.

No problem. John knows what he is doing.
 
H

Habib

Jan 1, 1970
0
SMB connector

This assumes a 50 ohm cable and scope input

Although SMB are less convenient because of more insertion effort i will
nevertheless proceed to PCB launch.

Best Regards.
 
We often use SMB connectors with series resistors to the circuit nodes tobe
probed.

http://www.highlandtechnology.com/DSS/V120DS.shtml

https://dl.dropboxusercontent.com/u/53724080/PCBs/V120A_top.JPG

The cluster of 9 SMB footprints is for probing PCI Express.

This assumes a 50 ohm cable and scope input. Bandwidth is many GHz.

similar to this: http://koti.mbnet.fi/jahonen/Electronics/DIY 1k probe/

and you probably don't need to solder the connectors in, I think with
a bit
of tweaking you could sorta press-fit when you need to measure

-Lasse
 
H

Habib

Jan 1, 1970
0
What I usually do to snoop a signal is something like


|
|
|
|
| 50r trace
+--450R-----------------------(o) SMB
| |
| gnd
|
|
|

With an 0805 or 0603 resistor, that's good to several GHz.

No stub effects in that case with GHz's ?

Never used MCX connectors ... i will give it a try tomorrow.

Best Regards, H
 
H

Habib Bouaziz-Viallet

Jan 1, 1970
0
The trace from the snoop point to the 450r
resistor should be very short.
That's exactly what i meant with GHz's (in fact very short rise and fall
times) a small portion of a inch could ruins a PCB design.
MCXs are used in Cisco servers or something, so there's tons of cheap
cables on ebay.
Ok thanks a lot John,

Habib.
 
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