What happens when you run calibration tests on your four wire probes? Steve. On 10/9/2014 10:11 AM, ben chia wrote: > 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 > > > -- Steve Weir IPBLOX, LLC 1580 Grand Point Way MS 34689 Reno, NV 89523-9998 www.ipblox.com (775) 299-4236 Business (866) 675-4630 Toll-free (707) 780-1951 Fax All contents Copyright (c)2013 IPBLOX, LLC. All Rights Reserved. This e-mail may contain confidential material. If you are not the intended recipient, please destroy all records and notify the sender. ------------------------------------------------------------------ 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