| ??? 07/12/09 13:54 Read: times |
#167121 - 0.1% Responding to: ???'s previous message |
Kai Klaas said:
No, these series divider resistors are specially fabricated in <0.01% for this application and are better available than any other precision resistors usually! Well, I hope to solve this problem with 0.1% resistors not expensive 0.01% ones. Kai Klaas said:
When you use these specially fabricated series divider resistors then the manufacturer already took care of thermovoltages. Also, most of your thermocouples cancel because of opposite sign. If you solder to copper (e.g.) on both ends of resistor then you have two identical thermocouples of opposite sign: "solder to copper" and "copper to solder". By the way, the most precise Amperemeters I know, use the series divider scheme... the main point that was in Per Westermark suggestion, was to remove temporary erroneous parallel shunt, but I said to him considering bounce time of switches is it do any good? about thermocouples, what if temperature of one end differs from the other? The question is,can it solve(or alleviate) my problem? |
