826
From Sensoray Technical Wiki
Calibration errors
On 826 SDKs earlier than version 3.2.0, analog calibration values will not be applied without J6 (labeled "Calibration Enable") installed. The shunt is intended to protect against accidental overwriting of the calibration values, but in these SDKs it also prevents the reading of those values. If board calibration is incorrect, make sure J6 is installed.
This is resolved in SDK version 3.2.0 and above; in these versions the shunt functions as intended and needs to be installed only when calibrating the board (though leaving it installed all the time is okay). The 826 SDK can be downloaded from the 826 product page.