Binghamton, NY Nov 10, 2009 #7 I'm not acquainted with meter operation, but I might suspect that it needs to deliver the switching voltages (13v for odd and 18v for even). And, if you'll want to see the opposite sats it has to ship the 22khz tone. I am not https://dienphucthinh22.wixsite.com/home/post/dau-cos-cap-dien-chinh-hang