Quote:
Originally Posted by coderguy 
My error still stands, I've tried 100 different things, about to email SpectraCal again to try to get meter replaced. I am not an all-out expert at calibration, but I am a programmer, so debugging isn't something I'm not used to doing. Maybe I missed something, but starting to doubt it.
My gray-scale reads on the RGB's could vary by as much a 40% at times. One simple way to test this I am guessing is just use a 50 IRE pattern, and have the C6 read it continously and automatically as if it were 10-100 IRE (even though it is only 50 IRE). Then look at the graphs over time after doing several reads. There are many ways to test, that is just one simple way. The reason I refer to this test, is because it requires making no changes away from defaults in the program (and you can mess with auto-synch or whatever without messing with other stuff), and you are introducing no extra variables and can easily see the variation in RGB reads at the same IRE from one read to the next. Most of the time I can keep the error under 10% (or even less), but the fact it EVER shoots off so much in a given hour of measuring is a big warning sign. I have done it on 3 different devices, in 2 rooms, on different screens, with different laptops, with different versions of the software, and in different combinations of settings.
If I set the meter to take 20 samples that would reduce the error, but that's not a good thing (not to mention how slow it is to take that many samples). The problem with this method is whenever you average error out that drastically, it would make any single giant reading less visible in the overall average, but it doesn't answer the question as to why those giant errors sometimes exist in a read based on a 3 or 5 sample read. On the first full 10 reads, I could get some repeatability success at times, but then it often varies. If it were normal for meters to read like this, then I'd say ok. Sure some repeatability variance is expected, but this looks to be too much.
My error still stands, I've tried 100 different things, about to email SpectraCal again to try to get meter replaced. I am not an all-out expert at calibration, but I am a programmer, so debugging isn't something I'm not used to doing. Maybe I missed something, but starting to doubt it.
My gray-scale reads on the RGB's could vary by as much a 40% at times. One simple way to test this I am guessing is just use a 50 IRE pattern, and have the C6 read it continously and automatically as if it were 10-100 IRE (even though it is only 50 IRE). Then look at the graphs over time after doing several reads. There are many ways to test, that is just one simple way. The reason I refer to this test, is because it requires making no changes away from defaults in the program (and you can mess with auto-synch or whatever without messing with other stuff), and you are introducing no extra variables and can easily see the variation in RGB reads at the same IRE from one read to the next. Most of the time I can keep the error under 10% (or even less), but the fact it EVER shoots off so much in a given hour of measuring is a big warning sign. I have done it on 3 different devices, in 2 rooms, on different screens, with different laptops, with different versions of the software, and in different combinations of settings.
If I set the meter to take 20 samples that would reduce the error, but that's not a good thing (not to mention how slow it is to take that many samples). The problem with this method is whenever you average error out that drastically, it would make any single giant reading less visible in the overall average, but it doesn't answer the question as to why those giant errors sometimes exist in a read based on a 3 or 5 sample read. On the first full 10 reads, I could get some repeatability success at times, but then it often varies. If it were normal for meters to read like this, then I'd say ok. Sure some repeatability variance is expected, but this looks to be too much.
So you are having this problem with the C6 correct? What type of display technology and what version of Calman?
I have seen mine do that in at 80 -100 on an old plasma but that was the only type of display that was really wild. My DLP was less than 2% at the 90 and 100. If you would like to try an older version of Calman I have most every release back to 4.2.1 and can post it for you.
