20.0.0 T4 Calibration Constants [T-Series Datasheet]

The T4 automatically returns calibrated readings, so most people need not concern themselves with this section.

The factory applied calibration constants are stored in Internal Flash and can be accessed at any time through the use of the Modbus registers discussed in the parent to this section (Internal Flash section).

The calibration constants begin at memory address 0x3C4000, or in decimal format d3948544. The structure (location) of each calibration value can be seen in the C code snippet below:

T4 Calibration Constants Structure

typedef struct{
    struct {
        float Slope;
        float Offset;
    } HV[4];
    struct {
        float Slope;
        float Offset;
    } LV;
    struct {
        float Slope;
        float Offset;
    } SpecV;
    struct {
        float Slope;
        float Offset;
    } DAC[2];
    float Temp_Slope;
    float Temp_Offset;
    float I_Bias;
} DeviceCalibrationT4;

Nominal Calibration Values

AIN Bias Current: 0.000000015