Ozen,
I just tried that as well, for Ch 1 and Ch 2, in both 1 M次 and 50 次 modes, all scales read as 1 M次 (998 k次 - 1.002 M次) in the 1 M次 mode, and as 50 次 (50.3 次 - 50.6 次) in the 50 次 mode. I only tried the DC coupled modes.
I think I was expecting to see less than 1 M次 for Ch 1 (in 1 M次 mode, or less than 50 次 in 50 次 mode), but looking at the attenuator schematic I'm not sure how that could actually happen. More importantly, I can imagine a way that stuck closed switches might decrease the 1 M次 impedance (by switching in the 50 次 path), but not how anything similar could happen for the 50 次 mode (that would require that the attenuator basically be shorted to ground, right?).
I need to go back and verify that each scale setting in Ch 1 produces the expected scale change on screen. If some of the switches are stuck I would expect that different scales would register the same voltage level.
-- Jeff Dutky
