Thoughts on a diy multimeter

[zeus_threat]

I have been thinking of building an instrument lately based on the following: . Its still a thought at the time being. The 16F877A oversampling ADC in the diagram could be for testing purposes and get replaced with an ADS1115 or an LTC2400. Any feedback is welcome. Thanks

 

[zeus_threat]

DMM prototype V2

After considering complications simplicity always ends up winning. Attached is a simpler structure I am currently testing block by block it uses a single micro and will be battery powered. I am trying to hunt for 0.1% resistors on ebay + a reasonable current shunt. the opamps will be LT1013 and DAC MCP4921 and an LtXXXX ic as negative voltage generator for the opamps.