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3.2.1 Calibration Functions

Calibration information for the TR122 instrument electronics is stored in a nonvolatile

memory on the module as a series of gains and offsets. The gain for each channel in each front

end attenuator setting is stored. There is also a gain and an offset associated with the offset

circuitry for each channel in each front end attenuator setting. These settings are only changed

by a user during periodic calibration. However, software such as the TR122 turnkey application

must contain a method of doing this. These functions are declared as follows.

DCAPI TR122_CAL_SetGain(BYTE Channel, long IncDec);

DCAPI TR122_CAL_SetOffsetGain(BYTE Channel, long IncDec);

DCAPI TR122_CAL_SetOffsetOffset(BYTE Channel, long IncDec);

DCAPI TR122_CAL_Save(void);

DCAPI TR122_CAL_Load(void);

DCAPI TR122_CAL_Clear(void);

DCAPI TR122_CAL_Alignment(BYTE AlignmentState);

DCAPI TR122_CAL_SerialNumber(DWORD *SerNum, BYTE OverWrite);

Because the TR122 turnkey application is available, it is hard to imagine a situation

where a programmer would have to include these functions in an alternative environment.

Probably such things should in fact be avoided. However, the API itself makes use of these

functions to load calibration information to variables associated with this code and uses these

variables throughout the API in normal operation.

One function that might be used regularly is TR122_CAL_SerialNumber. This function

will return by reference the serial number written into nonvolatile memory on the module.

Be sure to set the OverWrite argument to 0 (false). If the serial number has not been corrupted

by misuse of this function, the value returned will be the number on the front panel ejector

handle of the module.

DDC TR122 User Manual

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