Optics and optical instruments. Veiling glare of image forming systems. Definitions and methods of measurement Ingestion-build-86103 6 Verification of safety requirements

6 Verification of safety requirements and/or protective measures

PD IEC/TS 61508-3-1 presents requirements by the application of which pre-existing software elements may be claimed to be proven-in-use for all or a part of safety function(s) of SIL1 or SIL2

BS EN IEC 60255-181 specifies the minimum requirements for frequency protection of the measuring relays and guides you in using the appropriate performance specifications for meeting these minimum requirements

PD IEC/TR 61832 on online analyser systems is useful for:

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Optics and optical instruments. Veiling glare of image forming systems. Definitions and methods of measurement Ingestion-build-86103 6 Verification of safety requirements1 Scope This International Standard adopts both the veiling glare index (VGI) and the glare spread function (GSF) as measures of the veiling glare characteristics of optical and electrooptical imaging systems. Laboratory measurement techniques are described in general terms and recommendations are made regarding the performance of the main subunits of the equipment. The measurement techniques described in this International Standard are chiefly valid