Timeline for Voltmeter scaling resistor front-end and ADC calibration coefficients
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 13, 2015 at 15:45 | comment | added | Nick Johnson | 100k+1k will give a ratio of 1/101, which isn't quite 1%. Offset error won't come from the resistor divider, but rather from other errors like ground current. | |
| Jul 13, 2015 at 15:22 | comment | added | user1070829 | Here are some of the recorded offsets 1V=1.320V, 2V=2.207, 3=3.105, 4=4.000,5=4.902,6=5.805,7=6.707,8=7.605,9=8.500,10=9.406 | |
| Jul 13, 2015 at 15:16 | comment | added | user1070829 | Thank you for the quick response. It looks like I need to revise my measurements. R1=100k, R2=1K 1mV=9.9uV The problem I have is there seems to be a large offset error in my readings. | |
| Jul 13, 2015 at 15:06 | history | answered | Nick Johnson | CC BY-SA 3.0 |