You need to add a network in series with any meter that isn't specifically a "leakage current meter". This human body network model is typically a 1500 ohm resistor in parallel with a 0.15uF cap. Obviously without it you get a very much higher reading than with it.
If you did have that network in your DMM measurement, then bandwidth is a likely culprit, and some standards include a frequency response spec that the meter has to meet. I always just use a special purpose leakage current meter. Regards, Jim Eichner Sr. Regulatory Compliance Engineer Mobile Markets Xantrex Technology Inc. Email: [email protected] Website: www.xantrex.com Any opinions expressed are those of my invisible friend, who really exists. Honest. -----Original Message----- From: Matsuda, Ken [mailto:[email protected]] Sent: Tuesday, October 03, 2000 12:45 PM To: [email protected] Subject: Leakage Current Measurements I found something interesting today. While measuring leakage current with a digital multimeter, I noticed a high amount of leakage. The unit incorporates a switching power supply, with some EMI/EMC circuitry. Anyhow, I read somewhere that DMMs are some times inaccurate with high frequency line conducted emissions. Took a old Simpson analog meter (took forever to figure it out, since I've never touched a analog meter hehehe) and found measurements that were rather low. The questions is, I'm wondering if UL or for that matter, any other testing agency actually know about this fact, or merely fail their clients with incorrect data. Any input on this subject would be appreciated. Ken ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
