HP 41C Video interface test. Howto?

[tribidouille]

Sylvain,
(I just posted a reply that I cannot edit yet as it has to be read by the moderator)
I misunderstood "TV adapter". I don't use any.
I thought it was referring to a cable to adapt different kind of plugs but I now see you talk about ad proper device.
The strange thing is that without this adapter, I get a clear image fron the HP Video Converter when I reach the right frequency. As you see on the picture, it really looks like clean and defined.

I have no idea of this kind of devices. I have to search further into documentation.