Uploaded January 2020 | Updated September 2026, 2 weeks ago
Well I finally got it working. After I played around with the display board it started working and I couldn't get it to stop working like it was before. As far as the 100mv range it turns out other than the switches being intermittent the 100mv range was probably working all the time. Thanks to Bruno who commented on a few of the videos in the series, I found out the 100mv only comes out the back connector J301 (round one) pins 2 & 3, pin 1 being Guard. I also show the 100mv path up to the op amps and some mods I made to the schematic. Oh a quick note on the schematic at time index 17:28 thru 17:53 the Cathode of CR14 connects to V7 not V1, this has been updated in my latest schematics dated 12 Sep 21 and later.
- One of my my viewers made a very detailed paper and analysis of this unit here; ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Data_Precision/8200
- Copies of my reworked Digital schematics can be found here; ko4bb.com/getsimple/index.php?id=manuals
- If you'd like my more up to date copies you can email me here; keith_noneya@att.net
Hope it helps someone. Thanks for watching. Best Wishes & Blessings. Keith Noneya
Well I finally got it working. After I played around with the display board it started working and I couldn't get it to stop working like it was before. As far as the 100mv range it turns out other than the switches being intermittent the 100mv range was probably working all the time. Thanks to Bruno who commented on a few of the videos in the series, I found out the 100mv only comes out the back connector J301 (round one) pins 2 & 3, pin 1 being Guard. I also show the 100mv path up to the op amps and some mods I made to the schematic. Oh a quick note on the schematic at time index 17:28 thru 17:53 the Cathode of CR14 connects to V7 not V1, this has been updated in my latest schematics dated 12 Sep 21 and later.
- One of my my viewers made a very detailed paper and analysis of this unit here; ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Data_Precision/8200
- Copies of my reworked Digital schematics can be found here; ko4bb.com/getsimple/index.php?id=manuals
- If you'd like my more up to date copies you can email me here; keith_noneya@att.net
Hope it helps someone. Thanks for watching. Best Wishes & Blessings. Keith Noneya
