About: http://webisa.webdatacommons.org/91382472

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In particular, the modulation voltage is modulated in substantially square-wave form, with the level of modulation voltage being approximately from 2 V to 10 V, in particular 4-5 volts.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com