RE: UL/60950-1 Cl. 2.1.1.7 Probe

2011-05-11 Thread emc-p...@ieee.org
)? Another question - will the probe be subject to ISO17025 calibration? Brian -Original Message- From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of rn...@san.rr.com Sent: Wednesday, May 11, 2011 4:41 PM To: 'John Woodgate'; EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: UL

RE: UL/60950-1 Cl. 2.1.1.7 Probe

2011-05-11 Thread emc-p...@ieee.org
Hi John: When conducting the voltage decay measurement, the measurement is either made with, or referred to, an instrument having an input impedance consisting of a resistance of 100 Mohms ± 5 Mohms in parallel with an input capacitance of 25 pF or less. Agreed. So any 100: 1 probe

RE: UL/60950-1 Cl. 2.1.1.7 Probe

2011-05-11 Thread emc-p...@ieee.org
Hi John: For a list of commercially available 100 Mohm probes and a discussion of the measurement, see my Technically Speaking column in Volume 4, Number 4, December 2008, issue of IEEE PSES The Product Safety Engineering Newsletter. This is available to IEEE PSES members at:

RE: UL/60950-1 Cl. 2.1.1.7 Probe

2011-05-11 Thread emc-p...@ieee.org
The standard says the result is referred to an instrument having an input impedance consisting of a resistance of 100 Mohm ? 5 Mohm in parallel with an input capacitance of 20 pF ? 5 pF The first time that I submitted test data under the 2d ed of 60950-1, the data review person had me submit the

Re: UL/60950-1 Cl. 2.1.1.7 Probe

2011-05-11 Thread emc-p...@ieee.org
In message DD4909DB1F9A2346A6EE5A2D723D0B3218A0EEAFD4@P3PW5EX1MB13.EX1.SECURESERVER .NET, dated Wed, 11 May 2011, jyelenc...@productsafetyinc.com jyelenc...@productsafetyinc.com writes: All,   If anyone has a source for the probe 100 Mohm +/- 5 Mohm in parallel with input capacitance of 20

RE: UL 60950-1 TNV-3

2008-04-16 Thread emc-p...@ieee.org
From: Robert F. Keller Sent: Wednesday, April 16, 2008 8:51 AM To All, How would you evaluate a TNV-3 circuit ,as defined in UL 60950-1, if it is ground start? I am running into problems with separation between TNV-3 and ground. Bob - There are some accommodations for this, built

Re: UL 60950-1 TNV-3

2008-04-16 Thread emc-p...@ieee.org
On 4/16/2008, Robert Keller wrote: How would you evaluate a TNV-3 circuit ,as defined in UL 60950-1, if it is ground start? I am running into problems with separation between TNV-3 and ground. Hi Rob: For ground start you have to use what I call the permanent ground exemption clauses in

RE: ul 60950-1

2002-01-22 Thread Peter Tarver
Brian and others interested - CSA/UL90950-1 will be discussed in a tentatively scheduled meeting in April at the UL60950 Standards Technical Panel, followed by a meeting that includes the UL60950 Industry Advisory Conference, Canadian Technical Standards Committee and the Bi-National Working