| ??? 04/23/09 18:25 Read: times |
#164813 - Why non-linear? Responding to: ???'s previous message |
If your system is non-linear, I think you should use a feedback loop. Use the DAC or PWM for generating a voltage, and then use an ADC for measuring the real value.
But I'm curios - why is your system non-linear? If you have a relay driver with low enough output impedance, then the output voltage should be linear and follow the DAC output. If your driver has a high output impedance, then you can't pre-calculate the lookup table other than for a specific relay with a specific load. Using an ADC to read back the real value would then be required to allow the unit to directly switch to measuring on other relays. Another thing - with an ADC, you could optionally measure contact bounces and the final contact resistance. |
| Topic | Author | Date |
| look up table for DAC | 01/01/70 00:00 | |
| What's the difficulty? | 01/01/70 00:00 | |
| look up table and DAC | 01/01/70 00:00 | |
| Table only needed if non-linear | 01/01/70 00:00 | |
| back to basics | 01/01/70 00:00 | |
| DAC and look up table | 01/01/70 00:00 | |
| Why non-linear? | 01/01/70 00:00 | |
| WHAT??? | 01/01/70 00:00 | |
You could have explained that in the first place! | 01/01/70 00:00 |