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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

C
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

 

Slope

Offset

HV[0] (AIN0)

3.235316E-04

-10.532965

HV[1] (AIN1)

3.236028E-04

-10.534480

HV[2] (AIN2)

3.235439E-04

-10.530597

HV[3] (AIN3)

3.236133E-04

-10.530210

LV

3.826692E-05

0.002484

SpecV

-3.839420E-05

2.507430

DAC0

1.310768E+04

54.091066

DAC1

1.310767E+04

54.044314

Temp

-9.260000E+01

467.600000

AIN Bias Current: 0.000000015

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