| ??? 06/19/05 10:00 Modified: 06/19/05 10:03 Read: times |
#95293 - This is wrong Responding to: ???'s previous message |
...but if i used a wheatstone bridge and then measured the voltage on the output. a adc wiyh lower resolution would be ok. becasue with the wheatstone bridge output voltage is only needed to be to 1 decimal place but can measure resistance to quite few decimal places. Sorry, but this is rather wrong! PT100 applications, which need very high precision do use 4-wire-technique, in order to cancel the voltage drop across the PT100's cable. A Wheatstone bridge does not support this 4-wire-technique. And as you told us that you want to measure temperatures up to +400°C, then you would need a cable, wouldn't you? And, why should the voltage drop in a Wheatstone bridge need to be less precise to achieve same accurate results?????? Again, what was wrong with the link Andy gave you?? Kai |
| Topic | Author | Date |
| Adc Refrence voltages | 01/01/70 00:00 | |
| More details needed... | 01/01/70 00:00 | |
| 1.000.000 volts! | 01/01/70 00:00 | |
| re:noise | 01/01/70 00:00 | |
| adc's | 01/01/70 00:00 | |
| Closer ,but still not enough info | 01/01/70 00:00 | |
| ADC'S | 01/01/70 00:00 | |
| Noise is irrelevant... | 01/01/70 00:00 | |
| Reference Voltage | 01/01/70 00:00 | |
| adc's | 01/01/70 00:00 | |
| re: RTD | 01/01/70 00:00 | |
| adc's | 01/01/70 00:00 | |
| Errr...please clarify | 01/01/70 00:00 | |
| This is wrong | 01/01/70 00:00 | |
| Possibility | 01/01/70 00:00 | |
| adc's | 01/01/70 00:00 | |
Andy's circuit | 01/01/70 00:00 |