Have used the Tek P5200 and some Agilent stuff. Active diff probes have caused me much grief in accurately detecting zero-crossings and other resultant weirdness that manifests various forms of distortion.
For hi-V and some AC mains measurements, I prefer two good 100:1 probes with the scope floated and in A-B differential mode. With a decent DSO, you will get little distortion and excellent response. I also use this for WV measurements in switching power supplies. But, just for proper triggering and measuring of input mains for the 3-3 and 4-11 stuff, just float the scope and use a decent 100:1 probe. If you choose a voltage-divider network, use three CC resistors (a good standard value is 90.9k) rated for 300V peak. Never use wire-wound resistors for hi-v dividers. You will also have to design a test to validate the circuit. luck, Brian From: [email protected] [mailto:[email protected]]On Behalf Of Wendy Nya Sent: Tuesday, June 21, 2005 10:12 PM To: Emc-Pstc@Ieee. Org Subject: Voltage Dips/Mains Interruption/Voltage Variation Monitoring I am using Schaffner's Profline Series to perform the above mention immunity test. The NSG 2200-1 (AC Switch) does not provide a low voltage signal where I can connect to the oscilloscope to monitor the percentage dip or voltage variations. Please advise me on the following: (1) A suitable circuit which I can easily build to step down the voltage such that I can connect directly to the scope (safely). (2) Or any other alternatives? I have an Agilent infiniium digital scope with a 10:1 miniature passive probe 300V max. This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [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://www.ieeecommunities.org/emc-pstc
