I just made another scanner test with the emma 10w/50kpps scanners.
Now i can confirm that it have safety system to avoid scanner galvo damage after 50k is overstepped. And yes it has real 50 kpps scanners according liberation.
After i push it over 50kpps scanners turned off. After lowering the speed down all works normal.
Here is small (bad quality, sorry) video from the test,. liberation 0.9.6 was used for test.
On video is scanning speed set to 47700 (hard to set perfect value thru the slider).
To be truth about it, it was not mine intention to do it deliberately and go over 50k (i just made the post like it was intentional ). For my defense, the point rate system does not accept numeric input and with the mouse slider i just overstepped. But i overstepped just a little, around 51000 and helios dac is rated 65kpps. I’m not sure which one of them turned off the scanners but booth off them together manage it well (and i assumed from intel i have that it was laser). And we hobbyist do not have all the tools you have. Why not to test the scanners this way ? I can better sleep when it is true. Most people here (and other forum) don`t give you any intel about this (except do not trust anyone when it is cheap).
Sorry if i have done anything wrong or forbidden, i just want to give some intel for others. Maybe someone will find it useful.
Point rate is not a way to stress test scanners in Liberation.
Even in older versions that didn’t adapt the point stream, the PPS didn’t necessarily correspond with the 50k at 8º type scanner specifications.
Running the stream at 50KPPS is meaningless if the point stream is rendered such that it is still moving the scanners slowly.
Real-world results over time are much more meaningful than a quick test like this. A simple pattern can look perfect at high PPS without actually being a demanding signal.
The cutoff you saw above ~50K is probably a quirk of the DAC implementation. Scanners don’t usually have a hard “limit” like that - they just become unstable/overheat/break if pushed too far.
I can’t stress this enough:
Unlike traditional software, POINT RATE is not analagous to SCANNER SPEED in Liberation.
If you do want to test scanners in a more meaningful way, the ILDA test pattern at a known scan angle is still the closest thing we have. But proceed with extreme caution. You’ll need to use some other software though - Liberation can’t do these kind of tests.
Also I did just want to say that it’s great that you’re experimenting and sharing results. This stuff is confusing, and most of us have gone through the same thought process at some point
I have done test of scanners thru madlaser and perfect results. cca 20 degrees 45 kpps at 42.2 fps 1066 points per frame. Nice sharp results. 50 kpps scanners are present, now i can sleep better
And here better image of the laser shape (this time only red laser)
Just to clarify one final point before I close this thread:
The test you’ve done in MadLaser isn’t equivalent to an ILDA scanner test. Using an arbitrary clip can’t measure scanner performance, because the point distribution and motion characteristics of that image are unknown!
So while it may look sharp at higher PPS, that doesn’t necessarily mean the scanners are capable of reproducing the ILDA test pattern at those rates under standard conditions.
As discussed above and in the article, scanner specs like “50K @ 8°” require a controlled test setup to verify.
I’m going to close this thread now as it’s starting to get a bit confusing, but hopefully the article helps clarify things for anyone reading.
). For my defense, the point rate system does not accept numeric input and with the mouse slider i just overstepped. But i overstepped just a little, around 51000 and helios dac is rated 65kpps. I’m not sure which one of them turned off the scanners but booth off them together manage it well (and i assumed from intel i have that it was laser). And we hobbyist do not have all the tools you have. Why not to test the scanners this way ? I can better sleep when it is true. Most people here (and other forum) don`t give you any intel about this (except do not trust anyone when it is cheap).
