| ??? 09/10/07 09:46 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#144256 - DIffierent Divider Perhaps Responding to: ???'s previous message |
Why limit the voltage divider to producing a max sense voltage of 6V. You can select different resistors to divide down to the 2.5V max range of your A/D converter.
Another thing to keep in mind is that the DPM you are using for the manual measurements may be higher resolution than the A/D converter on your MCU. Common MCUs have 10-bit A/Ds that can only resolve the conversion range into 1024 steps. Cheaper parts that have 8-bit converters can only resolve to 256 steps. On the otherhand the DPM is likely using a dual slope converter with an ability to resolve its readings into 10,000 steps or more. Michael Karas |
| Topic | Author | Date |
| High Voltage measurement | 01/01/70 00:00 | |
| reply | 01/01/70 00:00 | |
| Proper reading? | 01/01/70 00:00 | |
| non linear | 01/01/70 00:00 | |
| Resistor divider rating | 01/01/70 00:00 | |
| NON-linear ??? | 01/01/70 00:00 | |
| what is 'across' the 1M | 01/01/70 00:00 | |
| Does it matter | 01/01/70 00:00 | |
| e.g. A \'protection diode\' may leak a bit | 01/01/70 00:00 | |
| Parasitic ? | 01/01/70 00:00 | |
| DPM are normally very highohmic ... | 01/01/70 00:00 | |
| the problems | 01/01/70 00:00 | |
| A good idea, indeed! | 01/01/70 00:00 | |
| DPM input | 01/01/70 00:00 | |
| Thanks to all | 01/01/70 00:00 | |
| That's all very well | 01/01/70 00:00 | |
| Yes, Jprao, please answer our questions! | 01/01/70 00:00 | |
| DIffierent Divider Perhaps | 01/01/70 00:00 | |
| DPM? | 01/01/70 00:00 | |
| DPM is a widely used term... | 01/01/70 00:00 | |
| many DPMs use ICL7106 | 01/01/70 00:00 | |
Yes, evolves into a heart-stopping thread... | 01/01/70 00:00 |