UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

trobbins · 25th May 2020, 8:45 am

LEM make a wide range of current transducers, and due to smps applications, some models are quite plentiful and cheap and even on ebay (eg LTS6). When used with a soundcard and spectrum software they are awesome for audio span. I recently used an LA25 and scope to check out some transformer mains in-rush levels, with the LA25 in a mains AC pass-through box.

Just trying to make the point that there is a disconnect between a toroid transformer making a hum, and trying to measure some level of DCV on the mains.

Gone are the days when you needed to own a TEK A6302/AM503 wand/plug-in combo.

25th May 2020, 8:45 am	#55
trobbins Heptode Join Date: Oct 2009 Location: Melbourne Australia Posts: 901	Re: How much DC on your mains ? LEM make a wide range of current transducers, and due to smps applications, some models are quite plentiful and cheap and even on ebay (eg LTS6). When used with a soundcard and spectrum software they are awesome for audio span. I recently used an LA25 and scope to check out some transformer mains in-rush levels, with the LA25 in a mains AC pass-through box. Just trying to make the point that there is a disconnect between a toroid transformer making a hum, and trying to measure some level of DCV on the mains. Gone are the days when you needed to own a TEK A6302/AM503 wand/plug-in combo.