[SI-LIST] Re: FET Probe


Hi James,
I too had observed similar problem, when scoping the DDR Strobe signal with
an HP (now Agilent) FET probe.  However, the problem vanished once I
connected the short ground pin.  You also have to make sure that the probe
is directly connected to the board, and not through a long jumper wire.

Regards, Ravinder
PCB Development and Design Department
IBM Corporation
Email: ajmani@xxxxxxxxxx
***************************************************************************
Always do right.  This will gratify some people and astonish the rest.
.... Mark Twain



                                                                                
                          
                      James_R_Jones@Del                                         
                          
                      l.com                    To:       si-list@xxxxxxxxxxxxx  
                          
                      Sent by:                 cc:                              
                          
                      si-list-bounce@fr        Subject:  [SI-LIST] FET Probe    
                          
                      eelists.org                                               
                          
                                                                                
                          
                                                                                
                          
                      10/31/2002 12:15                                          
                          
                      PM                                                        
                          
                      Please respond to                                         
                          
                      James_R_Jones                                             
                          
                                                                                
                          
                                                                                
                          





Gurus,

Does anyone have a basic schematic for Tektronix FET probe?  I don't need
proprietary details about the probes, but just a basic schematic of what we
see looking into the probe, and relative to scope ground.

The reason that I am asking is that I have a board that will not come up
properly when the positive terminal of the probe is hung off of a DDR
strobe
line.  No ground attachment required.  With the probe disconnected from the
scope at the scope, the problem does not exist.  Anyone seen this before?

Thanks in advance,

James R. Jones
ESG Signal Integrity
Dell Computer Corporation
(512) 725-1809


------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:
                         http://www.freelists.org/archives/si-list
or at our remote archives:
                         http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                         http://www.qsl.net/wb6tpu







------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: