Who do you believe?...
 

Who do you believe? Lying chrony.  

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pluric
(@pluric)
Joined: 2 years ago
Posts: 465
2019-05-27 15:48:53  

My son and I were adjusting some guns and listening to the gun I swore there was no way it could be shooting as slow as the chrony stated. It's the one I use the most because it can Blue Tooth the info to my phone and has built in lighting. So I pulled out another one to see it there was any difference. It was like a 80 fps spread. Added one more to see which ones stayed the closest. All three read different. The two lower ones stayed pretty close to each other. 

Now I don't know which to trust? Hate to think I must used three every time I really want to know a speed. Even then it would be an average.

Chrony

Chrony A

Update:

The plot thickens. I tried it again and now the one the read the lowest reads the highest.

Chrony B


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James Perotti
(@jpsaxnc)
Joined: 2 years ago
Posts: 75
2019-05-28 06:28:32  

Your aware that shadows on the crony , can throw off the readings right? One window in shadow and the other window not, will give false readings.  hth


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pluric
(@pluric)
Joined: 2 years ago
Posts: 465
2019-05-28 07:24:36  

The photos are a little deceiving. The one in the rear is in the light. 

I tried to keep them in a similar light source. The grey one did get a slight shadow from being under one but most of shooting time was in the light. The variables were quite spread out between the three of them. FX will allow their new mini chrony to be sold next month. I saw one being used indoors without additional lighting. We are on the waiting list.

I also found it odd that the chrony that was continually reading a lower speed than the other two suddenly became the faster reader? 


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James Perotti
(@jpsaxnc)
Joined: 2 years ago
Posts: 75
2019-05-28 08:39:23  

Yeah, that's strange.  I have the F1 and the Pro crony, I place them end to end, and then switch positions, and they've read within 1-2 fps. of each other.


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pluric
(@pluric)
Joined: 2 years ago
Posts: 465
2019-05-28 09:13:23  

Yep, I'm starting to wonder if too much light could be a problem? The lower chronys have sun shades or diffusers that I was not using. The Upper one actually works upside down and has the LED auxiliary lighting in the white bar. I didn't have the LED lights on. Normally I use them during lower light situations.  It was bright and sunny. In hindsight I should have moved them forward into the shade of the garage and tried it. Raining this morning so no retest right now.


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Jim in SWMO
(@jim-in-swmo)
Joined: 2 years ago
Posts: 216
2019-05-28 10:39:25  

Interesting thread. I've always wondered how the readings of different brands of chronos would compare.

FWIW, I think you're probably right about it being too much light. The manual for my ProChrono says you should always use the diffusers on bright sunny days. I use mine in the basement with the LED light kit so all I have to worry about is whether or not the batteries in the chrono are good, lol.

I'll be waiting to see how your next test turns out.

"You've come far, pilgrim."-------"Feels like far."
"Were it worth the trouble?"-----"Ah, what trouble?"


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DonC
 DonC
(@donc)
Joined: 2 years ago
Posts: 106
2019-05-28 11:34:23  

Perhaps the sensors are dirty. I cleaned mine once with Q-Tip and mild solvent Goo-Gone. I then applied clear 3-M packing tape over the sensors to keep future dirt away. I always wipe the tape dust off before testing. Also I use a very consistent rifle to test the chrony. I have found most single stroke pneumatics to be the most consistent with a extreme spread of only 1 to 3 f.p.s.

I test with a SSP Feinverkbaugh 603 10 meter rifle. Give cleaning a try and get back to us. Also try indoor testing with perfect lighting.


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pluric
(@pluric)
Joined: 2 years ago
Posts: 465
2019-05-28 20:31:23  

Tried it again with an overcast sky. They read different but not as much as before.

Chrony C

If you can't read the numbers it's 852, 858 and 863.

I didn't clean the sensors yet. I wanted to eliminate one option at a time. Grand kids came over so I put the stuff away to play with them.


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DonC
 DonC
(@donc)
Joined: 2 years ago
Posts: 106
2019-05-29 11:23:12  

I'm a brand new Grandpa. My son AND daughter are both having baby boys & months apart. What a difference a year makes.

I'm looking forward to playing with them like you.


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pluric
(@pluric)
Joined: 2 years ago
Posts: 465
2019-05-29 12:34:35  
Posted by: DonC

I'm a brand new Grandpa. My son AND daughter are both having baby boys & months apart. What a difference a year makes.

I'm looking forward to playing with them like you.

I've always heard how fun grand kids are and I have to agree! It's about the only thing I look forward to anymore. Oldest is a pretty good shot and the rest are too young. Excited she took the head off a Zombie.

Holland ab


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