well then, you have your answer. Scott McMorrow Teraspeed® Consulting - A Division of Samtec 16 Stormy Brook Rd Falmouth, ME 04105 (401) 284-1827 Business http://www.teraspeed.com On Thu, Oct 9, 2014 at 6:23 PM, ben chia <bchia@xxxxxxxxxxx> wrote: > Hi Tom, > > The package resistance spec of Vdd or Vss includes all the ball/via/bumps > in > parallel. > > Thanks, > > Ben Chia > High Speed Design Center > www.HighSpeedDC.com > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] > On > Behalf Of Tom Dagostino > Sent: Thursday, October 09, 2014 11:07 AM > To: bchia@xxxxxxxxxxx; 'Si-List' > Subject: [SI-LIST] Re: milliohm measurement probe and cable > > Ben > > Is the vendor's spec to a single ball or the resistance through all the > balls to the outside? > > Tom Dagostino > > Teraspeed Labs > 9999 SW Wilshire Street > Suite 102 > Portland, OR 97225 > > tom@xxxxxxxxxxxxxxxxx > www.teraspeedlabs.com > > 971-279-5325 office > 503-430-1065 cell > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] > On > Behalf Of ben chia > Sent: Thursday, October 09, 2014 10:12 AM > To: 'Si-List' > Subject: [SI-LIST] milliohm measurement probe and cable > > Hi All, > > I try to measure the package VCC or VSS resistance to match the simulation > report from vendor. Vendor said that the resistance should be less than 2 > milliohm from bump to ball. The setup in my lab is Agilent multi-meter ( up > to 1 milliohm resolution, 4 wire ). I use GGB 40A 150um center pin to touch > the bump. A 26G coax cable to connect the probe to multi-meter. The > measured > result is stable up to 1-2 milliohm, but resistance value is more than tens > of milliohm. Can anyone recommend a different setup? > > Thanks, > > Ben Chia > High Speed Design Center > www.HighSpeedDC.com > > > ------------------------------------------------------------------ > 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: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > List forum is accessible at: > http://tech.groups.yahoo.com/group/si-list > > List archives are viewable at: > //www.freelists.org/archives/si-list > > 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: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > List forum is accessible at: > http://tech.groups.yahoo.com/group/si-list > > List archives are viewable at: > //www.freelists.org/archives/si-list > > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2013.0.3485 / Virus Database: 4031/8354 - Release Date: 10/09/14 > > ------------------------------------------------------------------ > 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: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > List forum is accessible at: > http://tech.groups.yahoo.com/group/si-list > > List archives are viewable at: > //www.freelists.org/archives/si-list > > 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: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu