Charlie,This is the unit PA was using in their airgun test videos about four years ago, when I bought mine:www.amazon.com/gp/product/B000EWY67WThe one you are describing sounds like it has even broader capability. I was looking for a meter with "fast" (short duration) capability, that took into account the human perception of loudness as a function of frequency. My understanding is that this is setting "A".Also, I figured that rather than argue with PA, I would use "their meter"
Hats off to you Charlie, fantastic ongoing effort!!! Hopefully you had some fun mixed in with all the work
Yeah but mine has nine buttons...(just kidding Sub!).
Quote from: mrbulk on January 27, 2021, 03:33:12 PMYeah but mine has nine buttons...(just kidding Sub!). Yes, but does it go to 11? Video runs, if you click it:
Charlie, have you done any analysis on POI shift between the various LDC's? I ask because I was testing the A.U.O. on various air guns and noticed a definite and different POI shift on everyone of them. Everyone of them would have needed to be re-zeroed after swapping LDC. I find this fascinating since there is no evidence of clipping. I'm also happy to announce, it has found a permanent home on my .22 DAR. While there was a POI shift, the groups also tightened up considerably! Don't ask me why, I have no clue, but I'm not going to argue with the results!
Oh man, you're a glutton for punishment! No, the work is greatly appreciated by all of us
"Airgun S&M"...
Charlie, Kidding aside, I appreciate the amount of effort you put in and are planning to put into the upcoming tests.A thought on your test setup. I think in earlier posts you said the target was at 30 yds and the sound meter at 50 ft. I'm not sure exactly how the soundmeter samples in Fast mode, but you may want to place it far enough away from the target so that the impact sound arrives more than 125 ms after the arrival of the muzzle sound. The picture below shows a shot with a P-17 pistol with the target much closer. You can see the second sound on the trace and in this case it would be lumped into the 125 ms long measurement. If you know the approximate average speed of the pellet, the timing and placement can be calculated. If I did my algebra right, at an average pellet speed of 700 ft/s and your 90 ft range, you would get a 125 ms delay at about 47 ft from the muzzle. Further for slower pellets, closer for faster pellets. If you have a laptop, you can check this with the free Audacity software and the internal (or external) mic. You don't really need to get into the software too much to check the soundwave timing like I did in the image. This approach can also give you an idea how reflections from the ground and walls show up in different locations.You can also check it with your sound meter and multiple shots with a moderator in place, by moving the target closer to see if the readings change. Though without knowing when each sample starts that may be a bit of a hit or miss.