| 1.74 | influence quantity | ||
| Quantity that, in a direct measurement, does not affect the quantity that is actually measured, but affects the relation between the indication and the measurement result. | |||
| Example 2: | Amount-of-substance concentration of bilirubin in a direct measurement of haemoglobin amount-of-substance concentration in human blood plasma. | ||
| Example 4: | Background pressure in the ion source of a mass spectrometer during a measurement of amount-of-substance fraction. | ||
| Note 1: | An indirect measurement involves a combination of direct measurements, each of which may be affected by influence quantities. | ||
| Source: [VIM 2.52] with Examples 1 and 3 and Note 2 omitted. | |||
| 1.74 | influence quantity | ||
| Quantity that, in a direct measurement, does not affect the quantity that is actually measured, but affects the relation between the indication and the measurement result. | |||
| Example 2: | Amount-of-substance concentration of bilirubin in a direct measurement of haemoglobin amount-of-substance concentration in human blood plasma. | ||
| Example 4: | Background pressure in the ion source of a mass spectrometer during a measurement of amount-of-substance fraction. | ||
| Note 1: | An indirect measurement involves a combination of direct measurements, each of which may be affected by influence quantities. | ||
| Source: [VIM 2.52] with Examples 1 and 3 and Note 2 omitted. | |||