The calibration conditions are the measurement conditions during the calibration process.
Establishing and maintaining the calibration conditions is an important part of the calibration,
because any change of these conditions is capable of producing erroneous measurement
results. The calibration conditions should be a close approximation to the intended operating
conditions. This ensures that the (additional) uncertainty in the operating environment is as
small as possible. The calibration conditions should be specified in the form of nominal values
with uncertainties when applicable. In order to meet the requirements of this standard, the
calibration conditions shall at least consist of: