Measuring Input Impedance of MSO5074

Over here I asked about the measurements I was getting when I tried to measure the input impedance of my scope with my multimeter.

I was getting a reading I didn’t expect or understand, but that turned out to be because of a dud BNC to banana adapter that I was using.

For some reason this adapter had either a 1.5 MΩ or a 6 MΩ resistance across it. It would change from time to time when I plugged in banana plugs. Weird. I can only assume some sort of manufacturing problem.

I threw the adapter in the bin and measured again with functional equipment and got the reading of 1 MΩ that I was expecting.

Rigol MSO5074 HDMI

I got my Rigol MSO5074 outputting to HDMI:

I can’t get it to work on my bigger HDMI monitor though, not sure why. Maybe the cable is too long? Maybe the signal is too low resolution? I don’t really know enough about HDMI to guess at the cause.

// 2022-09-18 jj5 – UPDATE: according to this there’s a known issue with HDMI that’s fixed with a firmware upgrade. Might have to look into that.