Scannermax 506s

[Pangolin]

Hi Norty,

What you called "pinch bolts" are still imperial (hard to get away from) but there are technical reasons for that. Cambridge does the same thing for the same reasons... I am contemplating including an allen wrench in with them however. Still thinking about this...

Regarding who can make the test pattern, hehe, this comes up every once in a while, but Patrick Murphy and I made almost all of the test patterns in this industry. So... it likely will be up to me to do this.

Al, your idea is not bad. It's certainly worth considering. But I don't like the "needing to rotate it" idea. I was thinking of "doubled lines" (lines that scan over the same location but in each direction so it looks like a single line) at different angles, and you increase the size of the pattern until one or more of the "doubled lines" become obviously bowed and no longer a single line. That, plus some other angled features that will "pull away from each other" if velocity is too high. Things like that. Plus perhaps a series of circles and squares -- not just one -- since I showed that the Compact 506 did better than DT40 even at 24K with larger angles, and 30K with somewhat smaller angles.

Anyway, it's still just a thought process now -- but stimulated by the whole "how fast can you go at 8 degrees", when almost nobody in the world goes 8 degrees...

Bill

[The_Doctor]

I'll defer to Bill on the test pattern. Seems to me that combining the rotating line and a static pattern might be hard, and create a lot of data, and rotating the LaserMedia pattern looks like doing enough of the job already. While I tested the rotating line at wide angles, it didn't show me anything that the LaserMedia pattern didn't, so fas as I know.

In a post in the scanner options thread (near top of page 2) I mentioned three tests in one related to the rotating line, boiled down they amount to this:

1. Rotate LaserMedia pattern (switch off interpolation first, if any is being done), until the diagonals in it bow apart as you push the scan angle wide. That finds onset of ballistic response, large step response. Bigger angle equals better.
2. Try a rotating line based on interpolation to keep the step response small, and if at modest angles there is any bowing apart of lines it indicates contamination or increased viscosity of lubrication, friction, as a general indicator that all may not be well with the scanner bearings.
3. If the bowing apart of lines occurs at 45° static angles (no rotation), it likely indicates that the scan amps are not equally matched for tuning in both axes.

Whether those three tests are mutually exclusive, or whether one of the conditions will screw up the test for another condition I just mentioned, probably needs more thought than I've given it so far.

[White-Light]

Al, your idea is not bad. It's certainly worth considering. Plus perhaps a series of circles and squares -- not just one -- since I showed that the Compact 506 did better than DT40 even at 24K with larger angles, and 30K with somewhat smaller angles.

Bill

I really like that idea - maybe circles and squares for 30, 40 and 60 (or even 90) if 4 can be scanned which I'm going to doubt given the complexity.

1. Rotate LaserMedia pattern (switch off interpolation first, if any is being done), until the diagonals in it bow apart as you push the scan angle wide. That finds onset of ballistic response, large step response. Bigger angle equals better.

I had thought about rotating the grid in my suggestion but the small line sizes plus the fact that it would make rounding harder to spot put me off the idea. The reason I didn't go for the laser media patter is because it left no room for the elements.

Maybe I'll try and visualise something different again later provided Bill doesn't mind the slight thread tangent. I like throwing ideas out as it often stimulates other ideas whilst critical feedback is good for the learning process. I've already got a new pattern in my head from what you and Bill have said. I'll link the image to avoid clogging the forum.

[Galvonaut]

Thanks Steve for arranging the ILDA info - Loads of information there that I was unaware of and hopefully I'll figure out how to use this information (one day)!

Bill - I sort of understand bits and pieces in the test pattern - but when creating abstracts I sometimes get a little point-hungry - is there an appropriate test pattern that would show the scanners ability to cope with large numbers of points or is this a function of pps?

Keith

[White-Light]

This would be another idea for a possible test pattern:

http://imagizer.imageshack.us/v2/800...0/585/bd7k.jpg

Yellow lines are to be double lines as per Bill's suggestion ie double lined.

Would probably need to be used alongside the existing pattern as I don't think you'd be able to scan all the elements of the original pattern 3 times in the one pattern hence the cut down circle squares to test purely speed, gain and phase.

[mixedgas]

During some time in history, the text quoted in the attachment to this post was added to the older ILDA Test Pattern document, which is linked here: http://www.photonlexicon.com/forums/...9&d=1390539928
That third paragraph really puts the purpose of the A and B ILDA patterns in perspective.

Steve

[norty303]

I think this thread is a shining example of why off-topic content is invaluable in threads, and how natural progression of a subject under discussion may well elicit unexpected results/benefits.

Internet forums (in general!) I salute you!

[dkumpula]

So do we know "how low can we go" when it comes to amps with the 506's?

I'd love to give some 506's a go with my DT-30 amps in order to save my better amps for the future release of Saturns, however I wouldn't want to sacrifice the 506's performance significantly in order to save a few hundred bucks.

Assuming this is still an unknown, I'm willing to take the risk to see what Pango can do with the lower end amps.

-David

[masterpj]

hmn going to give it a go at the test pattern too. Got some ideas
Will post when I got a graphic done.
I have the lasermedia issue on one angle too.
However I have it when scanned without rotation. with rotation it's gone, I don't have this on another scanner so this is an opertunity to make a test pattern which forces it at all angles if occuring.
Will include a circkle with low point count and square and a color delay test (rising and falling and color shift) and feedback test. along with a small graphic that only shows up properly when a system is perfectly tuned (it will also show any occuring resonance).

Any other things you want to see from the scanner please PM me and I'll add it to the graphic.

The graphic will not flicker so test results can be shared more easly.

[norty303]

I'd love to give some 506's a go with my DT-30 amps in order to save my better amps for the future release of Saturns, however I wouldn't want to sacrifice the 506's performance significantly in order to save a few hundred bucks.

Look at the markings on your DT30 amps, you'll find they are DT40 amps

My amps that I'm running my 506's on are actually from a DT30 set.

Essentially, all Dragon Tiger did (afaik) is take the DT25 galvo and paired it with the existing DT40 amp to make the DT30 scan set.

The only difference between DT30 and DT40 is the galvo itself.

and people say 506 can do 30K at 50 degrees (!).

'Do' what?

They will scan at 30k/50 degrees, but you need to be a bit more specific regarding content. They will not do the ILDA test at 30k/50deg without some distortions to the circle, etc but nobody has yet claimed that they will afaik.