EEVblog #723 - Keysight 34470A 7.5 Digit Multimeter Teardown

What's inside Keysight's new 34470A 7 1/2 digit Truevolt bench multimeter? What are the PCB changes from the 34461A? What voltage reference does it use to get 16ppm nominal accuracy? High res photos: http://www.eevblog.com/2015/03/13/eevblog-723-keysight-34470a-7-5-digit-multimeter-teardown/ Forum: http://www.eevblog.com/forum/blog/eevblog-723-keysight-34470a-7-5-digit-multimeter-teardown/ 34470A Datasheet: http://literature.cdn.keysight.com/litweb/pdf/5991-1983EN.pdf 34470A Operating & Service Manual: http://literature.cdn.keysight.com/litweb/pdf/34460-90901.pdf LTZ1000 Voltage Reference: http://cds.linear.com/docs/en/datasheet/1000afd.pdf AD8638 Chopper Amplifier: http://www.analog.com/media/en/technical-documentation/data-sheets/AD8638_8639.pdf EEVblog Main Web Site: http://www.eevblog.com The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2 Support the EEVblog through Patreon! http://www.patreon.com/eevblog EEVblog Amazon Store (Dave gets a cut): http://astore.amazon.com/eevblogstore-20 Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/