I recently acquired a Fluke 8100A Nixie DMM that was in excellent physical condition for its age, and had the internal Ni-Cd battery pack option. The 8100A works perfectly ( no cal tests done yet though ), and I properly recycled the old leaking Ni-Cd cells, which I plan to replace ( and rebuild the pack ). However, I've found a voltage reference IC in the unit, called DH80417B. It's in a TO-39 metal can, and has a trademark on the top ( a right hand arrow point going through a lower case letter D ). In the Fluke 8100A schematic, and based upon it's position in the circuit, it's the DMM's voltage reference. I have read this IC was used in a number of other early Fluke multi meters and some early calibrators. However, I haven't been able to locate a data sheet for it. Was a data sheet ever published for this device? From what I know, data sheets were not published for the SZA263 and LTFLU devices, but what about this one?
Although the next point isn't a metrology topic, should the 8100A's tubular metallized foil capacitors made by TRW be replaced? We already know about replacing all the electrolytic capacitors, though. This 8100A has a lot of the Phillips "tropical fish" polyester capacitors, which don't need replacing from what I know.