To properly and accurately calibrate and adjust relative humidity
instruments is no simple task.
• Is the lab accredited?
• Does it know and understand the uncertainty of the calibration?
• Are the reference instruments really “reference instrument” level?
8 Critical Questions
Download the paper—“Is your Humidity Calibration Lab Competent?”
ROTRONIC APPLICATION NOTE
Is Your Humidity Calibration Lab Competent?
Find out by asking these 8 critical straight forward questions.
Question 1 – Is the
lab accredited to the ISO
Accreditation to the ISO/IEC 17025
standard for competency and test-
ing calibration is a really good
place to start. In general, accredita- tion does
to a set of
procedures should provide. ISO/IEC
17025 accreditation confirms that
the calibration laboratory has suc-
cessfully addressed five major
areas within the calibration
process; Scope of Competencies,
Properly Defined Procedures,
Demonstrated Control of the
Process, Demonstrated Under-
standing of the Measurement
Uncertainty, Demonstrated Profi-
ciency in the Measurement. The
ISO 17025 accreditation ensures
that your calibration vendor has
given serious management and
technical attention to their capabili-
ties and can repeatedly perform
calibrations to that same level of
competence. Although accredita-
tion is a strong indicator that the
lab is competent, accreditation or
lack thereof should not be the sole
indicator of competence.
Question 2 – May I see the
uncertainty budgets for the
humidity calibration process?
Ask the calibration lab vendor for
the details on the uncertainty study.
When considering the uncertainty
of the calibration for humidity, the
lab should have examined the fol-
lowing sources: the reference
instrument uncertainty, repeatabil-
ity and drift of both the tempera-
ture and humidity reference
instrument, the temperature and
humidity gradients that are occur-
ring inside the humidity chamber,
the temperature and humidity
stability within the chamber where
the devices will be placed and the
resolution of the unit under test
(UUT). The lab should be capable
and willing to explain their calcula-
tions on uncertainty and what
assumptions went into the calcula-
tions. If they are unwilling or
unable to do so, you should proba-
bly ask why and maybe start look-
ing for another lab.
ROTRONIC UNCERTAINTY BUDGET
Measured Parameter or Range
Uncertainty (k= 2)
Humidity Measurement 0.1 RH to 0.8 RH 0.21 RH
Relative Humidity 10. 5 RH to 11. 5 RH 0.22 RH 34 RH to 36 RH 0.29 RH
Thermometer Probe 21 °C to 27 °C 0.065 °C
www.rotronic-usa.com • firstname.lastname@example.org • 631-427-3898
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