Good day to you all.
Just finished this redraw and would like to share with you all. Note this is the battery version schematic, Option -01.
The PDF's I used are too large to include in this post. I will add them another time. They are handier than the originals I downloaded as I changed them to text searchable and several other nice changes.
I am sorry to report that the schematic redraw is not text searchable. Every setting I have tried results in the schematic becoming big-time fuzzy. Rats; back to the drawing board!
Some Notes:
• All work based on two different manual downloads from the Internet. The one I used for primary reference is P/N 347906 and dated March 1976 Rev. 1. 5/79 and lithograph copyrighted 1982. The second source document has one single date shown on the last page: “Rev. 3. 8-73”. I did not use this older version as the schematic had obvious errors: i.e., citing range switch settings based on “1” rather than “2”.
• There is no legend. Fluke didn’t provide. For example; what’s the difference in the ground point triangle symbols? One with a line; one without? On the line powered only unit, they are shown interconnected. On the battery unit (Option -01) they are not shown interconnected. I traced out the power-line ground and added that to the schematic.
• Not sure where the unregulated +5 is used.
• R15: part of the Period / Turnover adjustment. One schematic indicates one leg of this pot tied to ground; another schematic shows it tied to minus 15VDC. Tried to trace out to no avail without a lot of disassembly.
• Power Supply: there was a line shown on both source schematics that made no sense being there; I changed it to dotted line. Also added C24 as my unit had it installed and one of the manuals did list it.
• The “Ohms Overrange Voltage Limit” section on the original schematic was outlined and cited as “Option -04”. Documentation on this option is non-existent.
• My DMM has the “Milli Amp Sec” option. There is no option number or circuitry information listed anywhere in the documents I have. The PCB used for this option is screened “8000A/MAS4001 / 450239 REV 0” and is quite complex. It is located where the Low Ohms PCB would have been installed.
And finally some questions. Has anyone fooled around and figure a circuit mod to change out the NiCD to NiMH battery charging circuit? I love this ole' timer and the old battery system is the only thing I'd like to change. Also, has anyone access to the schematic for the "Milli Amp Sec" option?