Inside the new Keithley DMM7510 7.5 Digit Bench Multimeter<br />What gives this unit it's superb 16ppm/1year accuracy specification?<br />What construction techniques have they used?<br />How and why are Fluke so heavily involved?<br />What considerations are given to the power supply and isolation aspects?<br />How does it compare with the cheaper Keysight 34770A meter?<br />UPDATE: The ADC used is a custom 32bit one for slow reading, and an 18bit AD7982 for faster readings. This chip is not marked, and there appears to be two of them on board.<br /><br />Forum: http://www.eevblog.com/forum/blog/eevblog-731-keithley-dmm7510-7-5-digit-multimeter-teardown/<br /><br />The Precision Thin Film Resistor Network video: https://www.youtube.com/watch?v=Rxy-VpSDPg4<br /><br />Hi-Res teardown photos: http://www.eevblog.com/2015/04/09/eevblog-731-keithley-dmm7510-7-5-digit-multimeter-teardown/<br /><br />Datasheets:<br />AD7982 18bit ADC: http://www.analog.com/media/en/technical-documentation/data-sheets/AD7982.pdf<br />LTC1050: http://www.linear.com/product/LTC1050<br />ISL28110: http://www.intersil.com/en/products/amplifiers-and-buffers/all-amplifiers/amplifiers/ISL28110.html<br />LSK389 Ultra low noise matched JFET http://www.linearsystems.com/assets/media/file/datasheets/LSK389.pdf<br />SSM2212 Dual matched transistor: http://www.analog.com/media/en/technical-documentation/data-sheets/SSM2212.pdf<br />DG411 Precision analog switch: http://www.vishay.com/docs/70050/dg411.pdf<br />TPS65251 Triple Switcher: http://www.ti.com/product/tps65251<br />Freescale MPC5125 Processor: http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPC5125<br /><br />EEVblog Main Web Site: http://www.eevblog.com<br />The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2<br /><br />Support the EEVblog through Patreon!<br />http://www.patreon.com/eevblog<br /><br />EEVblog Amazon Store (Dave gets a cut):<br />http://astore.amazon.com/eevblogstore-20<br />Donations:<br />http://www.eevblog.com/donations/<br />Projects:<br />http://www.eevblog.com/projects/<br />Electronics Info Wiki:<br />http://www.eevblog.com/wiki/
