![]() If you want some kind of hashmark on the chroma phase or component vector plane that roughly correlates to some kind of loose interpretation of what constitutes "fleshtone" - that already exists and has so for decades and it is the "In-phase" axis of any NTSC composite scope. there is no such thing as a "flesh tone line." Some of the reluctance around putting such an indicator on the display would go some distance in the direction of the bodies that regulate how digital datasets are interpreted, standardized and deployed. Hopefully without deriding the contemporary state of technical awareness with too much contempt, and perhaps speaking out of turn in defence of someone who is around on the other side of the world at the moment. That is why the on-board vector scope in almost every software offering is practically useless.īut as far as the "flesh-tone line" is concerned, if I am going to keep any of my reputation as Defender of the Engineering Faith is concerned. We need to see as much detail in that extremely narrow zone as possible. For colorists, the absolute value of saturation is not particularly important, except when its too high, but the origin, (grey scale balance) is critical. The latter of which is how I run my Videotek vector display: at 4.54x by default. Since the O-scope is defaulted at 60hz, all the waveforms would be Free Running because you don't know what the waveforms are SYNC to.Marc Wielage wrote: they were not receptive to suggestions for the product, like providing a wide-range magnify command for the Vectorscope display You would first measure the frequency/time of the waveform? but how would you find out what the SYNC frequency is? If I brought you a circuit board and had 10 outputs waveforms and I didn't tell you what the line or sync frequency was, how would you know what to SYNC, SOURCE, TRIGGER the O -scope to? Sourcing is the synchronization, the O scope is defaulted at 60hz, the horizontal bean circuit is going across the display at 60hz What's the difference between triggering and Sourcing? It's the same frequency at 1Khz waveform, the only difference is the Sync frequency ( external signal ) Is the time period different? phase angle different? or what is different about the two? What's the difference between a 1Khz waveform sync to a 60hz external signal VS a 1Khz waveform sync to a 400hz external signal? Thanks for the help on this, I really need this info You should have a thorough understanding of what is grounded and what is floating before attempting any such measurements. ![]() If you are scoping signals that are tied to the 400 Hz power supply, you should make sure the chassis of your scope is grounded so that a ground lead from your scope doesn't make your entire scope "hot" with 400 Hz power. I think a bigger problem is safety when working with power like this. If it is you will have to reduce the voltage with a transformer or something. If the only signal you can find that is synchronous with that 400 Hz is the actual 120-volt power itself, check your scope's EXT input voltage rating to make sure the 120 volts is not too high. If you need to trigger to the same 400 Hz that is powering the boards under test, then connect whatever signal you have that is synchronous with that 400 Hz power to the EXT input and select "EXT Trigger" in your trigger selector. If the scope trigger selector has a "AC line" option, you cannot use it because, as you said, it is only for triggering with 60 Hz. If your scope has an EXT input for triggering, then go ahead and use it.
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