The polarity for both DSO channels should finally be right in this pair of images. I'm now using Fomblin PFPE oil for the rifle's piston/cylinder lubricant. It's an extravagance, but only takes a few drops and seems to be doing a good job so far. I didn't want to take a chance on any dieseling destroying the transfer port's pressure transducer.The DSO's CH2 is now the accel and the scale is 100g's/V. CH3 is now the exit trip wire signal. Installing the FT into the rear end of the power plant seems to have tightened up a few thing's that might have been banging around in the earlier tests. The event timing seems to be about the same.When the pressure measurements are added to the mix the full shot cycle dynamics record should add much more clarity to future interpretations. I'm counting on Stan to continue getting me back on course when necessary.
Got back to doing a little testing. In addition to the Titan .22, I have a Quest 1000 in .177. I was curious how the recoil of the two compared. Both guns are original, without any tuning. Past Chrony testing has them in the 13-14 FPE range, with the Quest the higher of the two.I used the ADXL377 accelerometer module mounted to aluminum round stock to be a surrogate for a scope (first image). I also had the laser light gate on the muzzle to track pellet exit.The images below show overlays of 5 shots for each of the guns. They were all indexed to start at the same point. The final image is an overlay of one Quest and one Titan shot.I was expecting, for equivalent FPE, the shot cycles to be more similar between the two guns.Anyway, it was fun getting back into testing. I may get sucked into buying the more expensive ADXL1004 sensor......
"...contact with the stock."A long time ago, when I was a teen, the first step with a girl in a party used to be ask her for slow dance and .. a very light and careful touch cheek to cheek Nowadays, shooting a magnum springer, I always remember that
David, did you pick the values for the R-C filter for the bare ADXL1004's you got?