Agree with Mr. Woodgate, but there are additional problems. A good reference for this is Mr. Perkin's presentations and articles on the subject. Current and voltage waveforms in ground and touch Type Tests for switch-mode power supplies are very complex; and can vary in amplitude, frequency, crest factor, and duty cycle over the range of rated operating conditions, and will seldom be sinusoidal.
There is also the issue of multiple parallel current paths for leakage, which can be from the test configuration, loads, input reference and impedance, and the various influences of the Dark Side. For touch current, ground current, and the related WV Type Tests, there is no commercial test equipment available that can satisfy my requirements. Have built several iterations of the basic HBM nodes and signal conditioning over the eons that have served me well and identified problems that commercial test equipment would probably not reveal. Brian -----Original Message----- From: John Woodgate [mailto:jmw1...@btinternet.com] Sent: Monday, April 24, 2017 11:30 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Kikusui TOS3200 Leakage Current Meter Stray capacitances are different in the two modes, but probably only affect measurements if there are relatively strong high-frequency components in the current. With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. -----Original Message----- From: Peter Tarver [mailto:ptar...@enphaseenergy.com] Sent: Tuesday, 25 April 2017 00:49 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Kikusui TOS3200 Leakage Current Meter Hello. I am using a Kikusui TOS3200 to measure touch current for a 61010-1 application. The product is double-insulated and has accessible USB port connector shells connected to the secondary circuit reference. When using the TOS3200 in meter mode (using the two external meter leads), I obtain different results than if I measure using the faceplate 5-15R outlet and one external meter lead. For each test, I'm using the same measurement networks when attempting to correlate the results. When using the outlet, the meter lead connects to the USB shell. When in meter mode, I am connecting one lead to the USB connector shell and one lead to the power conductor of interest. Has anyone experienced this with either the TOS3200 or other leakage/touch current meters? FWIW, the manual does not indicate any special considerations are needed when using meter mode. The instrument is in good condition and went through a calibration verification in AUG2016. The currents are within "Measurement range setting Range 1," but the meter is set in auto range mode. I plan some additional experiments using defined ranges, rather than auto in the next day or so. Peter Tarver The information contained in this message may be privileged and confidential. It is intended to be read only by the individual or entity to whom it is addressed or by their designee. If the reader of this message is not the intended recipient, you are on notice that any distribution of this message, in any form, is strictly prohibited. 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