| ??? 04/04/05 06:02 Read: times |
#90924 - Re: selection on tolerances. Responding to: ???'s previous message |
I would feel that for one off or low volume production items it is a safe bet to use 0.1% resistors and be done with it. Selecting from a 1% batch brings another variable into the scheme - the accuracy of the DMM that is used. And then the TC is always there to play its part. Reason why I have long back stopped doing signal conditioners - best bought from a reliable source with a Cal. Certificate. The client is also satisfied. The signal conditioners I am talking about is for very low volume product [ Max. 5 per month. ] & the quantity of precision resistors required is also very small 7 resistors/device. The DMM accuracy is certainly a very important issue. Is it ok if I use two diffrent brands DVM for this purpose and cross check. [ Yes, I already have two DVM's ]. In case of op-Amp type amplifiers often its the ratio of the resistor value that matters. Can I take advantage of this fact to compensate for DVM errors. For example If I am using 22k resistors and 11k resistors can I take advantage that if the ratio of the results by DVM is 2 it should work. Even if there is an error with DVM it will be linear. Thanks & Regards, Prahlad Purohit |
| Topic | Author | Date |
| WEOT: Sorting descrete components. | 01/01/70 00:00 | |
| Tolerance | 01/01/70 00:00 | |
| continuing .......... | 01/01/70 00:00 | |
| Selections and tolerance | 01/01/70 00:00 | |
| Re: selection on tolerances. | 01/01/70 00:00 | |
Risk taking - logically | 01/01/70 00:00 | |
| Re: Continuing | 01/01/70 00:00 | |
| The other aspect of precision | 01/01/70 00:00 |