I haven't used my scope in years, and now need want to check the vertical waveforms from the video processor to the vertical out. Where should I have the "source" set to on the scope, and do I need to use the probe ground when checking? Thanks again group.
usually 'int'
and do I need to use
it a good idea, usually. sometimes a ground is established through the AC plugs ground but without seeing the scope or the equipment under test no one can know if that's what you have.
This raises many more questions, some of which may be SAFETY related.
What is the device being tested? A TV? If so (as well as other equipment), it may have a HOT chassis, which is extremely dangerous to work on without an isolation transformer. In addition to being electrocuted, there may be fireworks when attaching the scope ground to signal ground.
More details please.
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Yes Sam, it's a Sony TV. I do have, and use an isolation transformer. When I checked a few pins on the video processor, I kept getting the same waveform. When I connected the probe ground, the signal trace would dissapear. I have since fugured out what I was doing wrong. I didn't have the trigger set to auto. This also explains why I didn't see a trace before connecting the probe (didn't post this). I appreciate the concern and reply. Thanks again to all who replied.
That's how I blew up the very first TV I worked on. It was a learning experience. It cost me a $250 20" Stereo Sharp TV (long while ago) and was an amazing display of colors and smells along with sparks, flames, smoke, etc. Those days were fun.
The real pity of that type of experience is that - because we don't anticipate it - we don't have videocam running to allow lasting enjoyment (and sharing) of the spectacle.
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