Op 23-8-2011 0:07, Bill Gold schreef: >/ This is why Fluke used something else, I am not sure what yet, to setup the feedback string for the 5440/5442 voltage standards. I don't believe there are any mechanical switches in the feedback string of these units, but I haven't had time to look into this. />/ />The 5440 is chock full of big mechanical relays. Change the range and >hear it go "CLONK". > > >Rob. Hi, You don't have to open your 5440/5442, just check this site, where I left some shots of mine: http://www.amplifier.cd/Test_Equipment/other/Fluke5442A.html Watch the beautiful gold plated relais for range switching! (Clonk-e-di-Clonk!) Frank