Generally Inverse time overcurrent relays with Definite Minimum Time feature (IDMT. relays) are used in practice. There are many types of such relays available in relay-. market, viz. normal inverse relays, very inverse relays and extremely inverse relays. The. characteristics of these relays are shown in fig. 1.2. The other types of o/c relays are 3. second relay and 1.3 second relay. This means the time of operation of the relay is either. 3 or 1.3 second at Plug Setting Multiplier (PSM) equal to 10. Long time inverse relays. are used for o/c cum overload application. Voltage restrains o/c relays have their own. application.
Cleanliness Testing. Cleanliness Testing in the printed circuit board and assembly world encompasses the analysis of a specimen to determine the âtypeâ or âamountâ of a contaminant material. This contaminant material can be potentially anything; the material can be large or small and can be unknown, known, expected, or unexpected to the analyst or the requestor.
Microbial testing is currently employed to verify environmental and equipment sanitation practices, determine microbial quality of inputs like irrigation water or compost, monitor wash water quality, screen raw products prior to harvest and test finished products prior to shipment.