... Hum6. Low Stray Magnetic Field7. Low Operating Temperature Standard:a. 115/230 Primary &120/240 Primary Toroida32l Transforme30r ... 50 Hz c. Secondary Customized Power range: 20VA to 10KVAd. Standard UL506, UL1411, EN61558, EN6060-1, UL2601, UL544 e. ... AS: 1. PRODUCTION MANAGEMENT procedure:a. Adapt international ISO9001 standard in factory and workshop, use modern scientific management system ...