ISO/TS 16491-2012 pdf free download.Guidelines for the evaluation of uncertainty of measurement in air conditioner and heat pump cooling and heating capacity tests.
This Technical Specification gives guidance on the practical applications of the principles of performance
measurement of air-cooled air-conditioners and air-to-air heat pumps as described in Iso 5151, ISO 13253,
and ISO 15042.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (Including any amendments) applies.
ISOIIEC Guide 99, International vocabulary of metroiogy — Basic and general concepts and associated terms
ISO/IEC Guide 98-3, Uncertainty of measurement— Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)
ISO 3534-1, Statistics — Vocabulary and symbols — Part 1: General statistical terms and terms used in probability
ISO 5151, Non-ducted air conditioners and heat pumps — Testing and rating for performance
ISO 13253. Ducted air-conditioners and air-to-air heat pumps — Testing and rating for performance
ISO 15042, Multiple split-system air-conditioners and air-to-air heat pumps — Testing and rating for
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC Guide 99, ISO/IEC Guide 98-3, ISO 3534-1, ISO 5151, ISO 13253 and ISO 15042 apply.
NOTE The definitions of terms 3.1. 3.2, 3.3, 3.4 and 3.5 are taken from ISOIJEC Guide 99:2007, 2.39, 4.14. 2.53, 4.21 and 4.19, respectively, and they are repeated here for easy reference.
3.1 calibration
operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties and, in a second step, uses this information to establish a relation for obtaining a measurement result from an indication
[SOURCE: ISO/IEC Guide 99:2007, 2.39]
3.2 resolution
smallest change in a quantity being measured that causes a perceptible change in the corresponding indication
[SOURCE: ISO/IEC Guide 99:2007, 4.14]
3.3  correction
modification applied to a measured quantity value to compensate for a known systematic effect
[SOURCE: ISO/IEC Guide 99:2007, 2.53, modified]
3.4 (instrumental) drift
continuous change in an indication, related neither to a change in the quantity being measured nor to a change of any recognized influence quantity
[SOURCE: ISO/IEC Guide 99:2007, 4.21, modifed].ISO/TS 16491 pdf download.