| ??? 05/02/05 15:09 Read: times |
#92720 - Re: Wrong Assumption. Responding to: ???'s previous message |
Dear Steve,
Thanks for your kind reply, I agree that the calculation I mentioned in my post was the worst case assumption. As Kai said in his post in this thread the best method for having a caliberation pot is having it in series with some good quality [ low drift fixed resistor ] and the caliberation pot is having the value just enough to adjust for the error due to tolerances. For example where a resistor of 100k is needed one can use 99.9k 0.1% 15PPM/C resistor in series with a 200ohms 1% 100PPM/C Cermet pot. Thus the effective drift with a change in temperature=40C will be 59.94Ohms + 0.8Ohms = 60.74Ohms & Thats a change by 0.06% good enough for higher bit ADC's. Thanks & Regards, Prahlad Purohit |
| Topic | Author | Date |
| WEOT: Signal Conditioning the right way. | 01/01/70 00:00 | |
| Calibration | 01/01/70 00:00 | |
| Re: Caliberation. | 01/01/70 00:00 | |
| Assumptions wrong. | 01/01/70 00:00 | |
| Re: Wrong Assumption. | 01/01/70 00:00 | |
| Tracking the offset. | 01/01/70 00:00 | |
| re:drift | 01/01/70 00:00 | |
| Drift compentsation | 01/01/70 00:00 | |
| Track the drift | 01/01/70 00:00 | |
| another track | 01/01/70 00:00 | |
| Signal conditioniong | 01/01/70 00:00 | |
| Choosing precision parts is the remedy | 01/01/70 00:00 | |
| Re: Choosing precision parts. | 01/01/70 00:00 | |
| Ratio is important | 01/01/70 00:00 | |
| wikipedia for op-amp | 01/01/70 00:00 | |
power supply noise | 01/01/70 00:00 |