In the interest of making a more accurate measurement lets say I have a 10 amp shunt with reported resistance values for 1 Amp & 10 Amp input.
Nominal value 0.1 ohms.
reported values:
1 Amp = 0.100001 ohms-1 micro ohm above nominal
10 Amp = 0.100010 ohms-10 micro ohms above nominal.
For instance if I am measuring 5 amps could I assume resistance of 0.100005 or 5 micro ohms above nominal?
Thanks for your input.
Bryan-
Depends. We typically calibrate DC shunts at 80% of their rated capacity per Empro recommendations for 0.25% accuracy shunts, and at 10% increments along the range for 0.1% shunts. We have found the shunts to be highly linear, if heating effects are taken into consideration and minimized.
Here is a link that may be helpful... http://www.sypris.com/FileManager/Library/Methods_Current_Measurement.pdf (http://www.sypris.com/FileManager/Library/Methods_Current_Measurement.pdf)