Internal Temperature: This calibration is applied to the binary reading from channel 133 or channel 141 (internal temp).
UE9 Input Ranges
The UE9 input ranges can be found in section 2.7.2. For your convenience, that table has been provided again below.
UE9 Calibration Formulas (Analog In)
The readings returned by the analog inputs are raw binary values (low level functions). An approximate voltage conversion can be
performed as:
Volts(uncalibrated) = (Bits/65536)*Span (Single-Ended)
Volts(uncalibrated) = (Bits/65536)*Span – Span/2 (Differential)
Where span is the maximum voltage minus the minimum voltage from the table above. For a proper voltage conversion, though,
use the calibration values (Slope and Offset) stored in the internal flash on the Control processor.
Volts = (Slope * Bits) + Offset
UE9 Calibration Formulas (Analog Out)
Writing to the UE9's DAC require that the desired voltage be converted into a binary value. To convert the desired voltage to binary
select the Slope and Offset calibration constants for the DAC being used and plug into the following formula.
Bits = (DesiredVolts * Slope) + Offset
UE9 Calibration Formulas (Internal Temp)
Internal Temperature can be obtained by reading channel 133/141 and applying the following formula.
Temp (K) = Bits * TemperatureSlope
UE9 Calibration Constants
The table below shows where the various calibration values are stored in the Mem area. Generally when communication is
initiated with the UE9, three calls will be made to the ReadMem function to retrieve the first 3 blocks of memory. This information
can then be used to convert all analog input readings to voltages. The high level Windows DLL does this automatically.
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