I am not sure of a standard that specifies the use of the symbols, but my understanding of the origin is simply binary. Two states, 0 (low or off) and 1 (high or on).
Regards, Alex McKinney Product Safety Engineer LXE, Inc. Tel: 770-447-4224 x3606 Fax: 770-447-6928 -----Original Message----- From: Rich Nute [mailto:[email protected]] Sent: Tuesday, October 08, 2002 1:19 PM To: [email protected] Subject: Origin of power symbols 0 and 1? I am looking for the origin of the power symbols 0 (off) and 1 (on). The earliest standards that I have are CEE 10 and similar where the standard specifies something like: "Where a rotary switch is used for power, the 0 position shall be off and the 1 and higher position shall be on." Do you have the specific wording? Do you have something earlier than the CEE standards? Thanks for your help! Rich Richard Nute Hewlett-Packard Company 16399 West Bernardo Drive San Diego, California 92127-1899 Tel: 858-655-3329 FAX: 858-655-4374 e-mail: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
