Rechercher

Covers the definitions, the conditions and the methods of measurement used to ascertain the performance of transmitters having audio-frequency bandwidths generally not exceeding 10 kHz for the transmission of voice and other types of signals, using single-sideband amplitude modulation with full, reduced or suppressed carrier. This standard is intended to be used in conjunction with IEC 489-1.

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 plain holes. This standard is intended as a basis on which agreements between purchaser and vendor can be made.

Defines the characteristics to be assessed, the test methods to be used and establishes uniform requirements for judging properties and dimensions of multilayer printed boards. This standard is intended as a basis on which agreements between purchaser and vendor can be made.

This publication also bears the number QC 301800, which is the specification number in the IEC Quality Assessment System for Electronic Components (IECQ). Relates to fixed direct-current capacitors, using as dielectric a polypropylene film and electrodes of thin metal foils. Capacitors for reactive power exceeding 500 var are not covered by this standard. Prescribes preferred ratings and…

Standardizes the methods, general dimensions and preferred tolerances for the taping of these components, for example, resistors, capacitors, diodes, etc., for use in telecommunication equipment and electronic devices employing similar assembly techniques.

Applies to broadcast television receivers designed for monochrome and colour vision reception with accompanying sound. The standard constitutes a catalogue of selected measurements recommended for assessing electrical and acoustic properties of receivers such as audio-frequency response characteristic, volume control characteristic, audio-frequency non-linearity distortion, internally generated…

Specifies four standard designs of starting performance for three-phase motors, from 0.4 kW up to 630 kW for direct on-line or star-delta starting and rated on the basis of duty-type S-1 (maximum continuous rating). Also covers dual voltage motors in so far as the flux saturation level is the same for both voltages.

Standardizes the test conditions and methods for determining the main parameters and technical characteristics of electroheat equipment using one or more plasma torches. Specifies methods of test for: a)spraying, cutting and welding; b)solid, liquid and gaseous charge heating equipment.

Specifies details of the type of thermocouple to be used to measure the pinch temperature of quartz-tungsten-halogen lamps, the methods of preparation of the lamp and thermocouple, and the measurement to be made.