I'm still working on the screwed up Fluke 87-3. I don't think its analog. So, I'm starting to identify the chips. I just came across the TrueRMS converter that adds $100 to to a Fluke's price. They are only $5.65 in bulk! :P
https://www.digikey.com/product-detail/en/analog-devices-inc/AD737JRZ/AD737JRZ-ND/751030