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Enhancement factor [f] is often handled as f = 1. 49 CALIBRATION IN PRACTICE CALIBRATION BOOK Example: Using reference dewpoint meter (Relative humidity) Hygrometer Place both the UUC and the reference hygrometer into the chamber of a humidity generator, or, supply moist air (gas) generated by a humidity generator to both the UUC and the hygrometer. This enables comparing the indicated value of the UUC to the value of the reference hygrometer. CALIBRATION IN PRACTICE 50 Example: Using reference hygrometer (Relative humidity) Consideration before calibration work: • • • • Shorten the connecting tube from the generator to the hygrometer as much as possible.

The dewpoint temperature is the saturation temperature corrected for possible pressure differences between the saturator and the measurement chamber. Dewpoint temperature is calculated using the formula 1. A two-temperature generator is the most accurate humidity generator and is used widely as the realization equipment for dewpoint temperature calibrations in national measurement standard laboratories. The effect of the enhancement factor is very small and the uncertainty in the dewpoint temperature due to the uncertainty of the enhancement factor is usually negligible.

In cases where only the reference is monitored and found to be stable the Unit Under Calibration (UUC) may still be not stabilized. In cases where the measurement system is not stable, sampling should be used to ensure a good representation of the quantity being measured, not just a single measurement at one point. 35 CALIBRATION ACTIVITIES CALIBRATION BOOK The number of samples should be large enough. Typically ten samples are adequate but if the system has a lot of variations, up to 100 samples at a reasonable interval should be taken to cover the full variation.

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