| ??? 08/21/07 10:55 Read: times |
#143445 - Use a bridge configuration Responding to: ???'s previous message |
Don't use divider configuration, but use a bridge configuration. Use tree metalized resistors and one thermistor.
Connect a power supply to one cross pair of bridge and any differential inputs ADC +/- do another cross pair. When a thermistor will self heating a resistor in second divider will self heating to, so you will measuere only difference beetwen thermal coefficient thermistor vs resistor. If you want you can use a sinusoidal source as reference, but it makes a circuit more difficult. And you will stay independ of stability of supply source too. Yes a thermistor will still heating itself, but this a typicaly linear, so you can add correction. |
| Topic | Author | Date |
| Thermistor Self-heating | 01/01/70 00:00 | |
| Error budget | 01/01/70 00:00 | |
| Use a bridge configuration | 01/01/70 00:00 | |
| Error Budget | 01/01/70 00:00 | |
| measurement point | 01/01/70 00:00 | |
| measurement point | 01/01/70 00:00 | |
| Math | 01/01/70 00:00 | |
| >Dissipation constant< gives the answer | 01/01/70 00:00 | |
| Amplify | 01/01/70 00:00 | |
| The Center is not the only factor | 01/01/70 00:00 | |
| Linearisation | 01/01/70 00:00 | |
| >Dissipation constant< gives the answer | 01/01/70 00:00 | |
| Getting closer | 01/01/70 00:00 | |
| Correcting non Linearisation of thermister | 01/01/70 00:00 | |
| 1721 | 01/01/70 00:00 | |
| Nice link | 01/01/70 00:00 | |
| Measuring thermistors | 01/01/70 00:00 | |
| Braggard? Show your work | 01/01/70 00:00 | |
| nope | 01/01/70 00:00 | |
| ADC selection. | 01/01/70 00:00 | |
| Depends on your application | 01/01/70 00:00 | |
| The Components | 01/01/70 00:00 | |
| Accuracy... | 01/01/70 00:00 | |
| What BETA? 3890K or 3575K? | 01/01/70 00:00 | |
This thread might be helpful for you | 01/01/70 00:00 |