- Joined Dec 6, 2005
Bought a surplus RCA WO-505A Oscilloscope. Got everything working okay, except the Horizontal Amplitude (the test circle thing). I can get the internal source to display a test circle correctly with 24VAC on the vertical input, but in external mode, I connect the AC Source (24V Transformer) to both the vertical and horizontal inputs (common ground) and I get back a loopy-cornered skewed rectange. Any idea what's going on or how to fix it??