Scott, Ron, Is 40 ohms sufficient? Is this recommended strictly for RF or for safety with a Tempest isolated chamber? What is the leakage current of typical chamber filters? Of course it will vary depending on whether one has 20 A filters or 100 A filters and the quantity of filters energized at one time.
I do not know if our situation is typical -- our chamber has 3 A of leakage. It provided a 30 V potential to the service entrance ground. We do commercial level testing (Tempest was not required) so we compromised the isolation to provide a solid safety ground. I did not care for the "surprises" provided by the elevated potential on the chamber skin "ground". This is more of a question than an answer. I am curious as to what is typical in leakage current in the EMC community. Then you can draw your own conclusion as to what impedance is sufficient. Don Umbdenstock > ---------- > From: Lacey,Scott[SMTP:[email protected]] > Reply To: Lacey,Scott > Sent: Tuesday, December 07, 1999 3:41 PM > To: '[email protected]' > Cc: '[email protected]' > Subject: RE: Ground rod's > > > Ron, > Usually a quick check with a portable dc ohmeter is good enough. Use a > meter > (such as an older analog type) that has a fairly high test current. You > want > to see 40 ohms or less to the electrical service ground. > Scott Lacey > > > -----Original Message----- > > From: [email protected] [SMTP:[email protected]] > > Sent: Tuesday, December 07, 1999 11:26 AM > > To: [email protected] > > Subject: Ground rod's > > > > > > Does anyone know of a method of verifying continuity of a ground rod? > The > > rods are in a concrete floor in a busy lab. > > I want to make sure the rods are working and not just for looks! > > Ron Chernus, Denso, CA > > > > > > > > --------- > > This message is coming from the emc-pstc discussion list. > > To cancel your subscription, send mail to [email protected] > > with the single line: "unsubscribe emc-pstc" (without the > > quotes). For help, send mail to [email protected], > > [email protected], [email protected], or > > [email protected] (the list administrators). > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
