Installation Requirements for Air-to-Air Heat Pumps
1. Scope
1.1 This Standard covers the installation requirements for unitary air-to-air heat pumps with cooling mode ratings up to 19 kW (65 000 Btu/h), normally used with electricity, oil, or gas as the supplementary heating source.
1.2 This Standard covers unitary air-to-air heat pumps for new installations and heat pumps installed as part of an existing heating system.
1.3…
Statistical interpretation of test results — Estimation of the mean — Confidence interval
Concerns the estimation of the mean of a normal population on the basis of a series of tests applied to a random sample of individuals drawn from this population when the variance of the population is unknown and calculation of the conficence interval for the population mean therefrom and from the standard deviation. Test method may be subject to systematic errors.
Definitions of CAMAC terms used in IEC publications
Defines the terms specific to the CAMAC modular instrumentation and digital interface system which forms the subject of several IEC standards. It includes also other terms whose use is well established and those of corresponding characteristics of the NIM system of instrumentation.
Standardizes arc furnace test conditions and methods to determine the main parameters and technical operating characteristics.
Applies to industrial three-phase direct arc furnaces, the rated capacity of which is equal to or greater than 0.5 tonne. Also applies to furnaces having one or more electrodes, other than three-phase furnaces.
Density meters utilizing ionizing radiation. Definitions and test methods
Lays down definitions and test methods for density meters utilizing ionizing radiation designed for the measurement of the average density of liquids, slurries or fluidized solids. This standard applies to transmission type instruments only. Safety aspects are not included.
Printed boards - Part 5: Specification for single and double sided printed boards with plated-throug...
Defines the characteristics to be assessed, the test methods to be used and establishes uniform requirements for judging properties and dimensions of single and double sided printed boards with plated-through holes. This standard is intended as a basis on which agreements between purchaser and vendor can be made.
Measurements and test methods for 32 kHz quartz crystal units for wrist watches and standard values
Applies to 32 kHz quartz crystal units for wrist watches. Gives methods of measurement of resonance frequency, resonance resistance, frequency-temperature dependence and frequency pulling. Lays down test methods in accordance with IEC 68-2-6, 68-2-20, 68-2-21 and 68-2-27.
1. Scope
1.1 This Standard sets forth safety requirements and standards for the
sub-assemblies and assemblies of regular bicycles, as well as
recommended safety measures for their use and care.
1.2 Special bicycles, such as track bicycles design for use on racing
tracks and which may not have a normal braking system or other
operating systems…
1. Purpose, Scope and Application
1.1 Purpose
The purpose of this standard is to establish the requirements and test procedures for paper to be used in Optical Character Recognition (OCR) Systems.
1.2 Scope
This standard contains basic definitions, measurement requirements, specifications, and recommendations for papers used with optical character recognition readers.…
