[time-nuts] Re : HP10811 current versus temperature
marc_bury at yahoo.fr
Fri Nov 23 07:53:55 EST 2007
If you look for 4 terminal current sensing resistors, you can check "Vishay Z-Foil Bulk Metal".
I have not tested them but they seem to have nice specs:
VCS1625Z have a TC of 0,05ppm/C with value ranging from 0,3R to 2,0R, and stability to match.
> I have some 4 terminal current sense resistors at work, but they are very
> low values (0.1 ohm and lower), so what I may gain at the sensor I may loose
> in the amplifier. Right now, the 1 ohm resistor and OP-27 give a voltage
> that is way out of the noise, as the curve shows. If I can find more
> temperature stable resistors for the instrument amplifier, then I could use
> one of those 4 terminal resistors. I will see what I can get to improve this
> setup. As it is, it may not be extremely accurate in absolute terms, but it
> is precise and probably sufficiently relatively accurate for what I want to
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