We setup my chronograph on Friday and failed to get accurate readings. We got some very crazy numbers and the display was blinking which indicates something is not right. I think the culpret was the low angle of the sun, we setup about 2.00 pm which I thought would have about max light but the sun was pretty low on the southern horizon. Put in fresh batteries, tried with and without the diffusers. Even tried two 35P bodies but no good.
Anyone have any experience with similar situation. Bullets were .22 and .30 spitzers.
I'm figuring that it's fairly cold where you are right now. As AJ stated, the electronics might not be functioning well at low temps, but did you also consider condensation freezing on the sensors? If it was taken from a warm environment (truck, house, etc) and setup in low temps, condensation might be a factor.
If you can shoot something indoors (archery, pellet rifle) try testing it in warmer ambient temps to make sure it's working properly...then blame the cold when it won't work outside.
Ian, I have had the same problem when the sun angle is low. I found a simiple solution is to place a deck umbrells next to the defussors and you are good to go. I test loads well below zero and temp has never been a problem for me when using the 35P. Dave
Mine is the same way, once the sun starts going down it goes to crap!! but... my problems are usually later in the day (about 1-2 hrs before sunset)
I once had my chrony read extremely high numbers in the middle of the summer. I knew it was not right, because the numbers it was telling me, my bolt should have been welded shut! I changed the battery, and the next time and every time since it has seems to work fine.
Ian, I usually try to beat the crowd to the range, so I get their at the crack of dawn. I have found that to be useless however, because as the sun rises, the chrony wont work. Same problem, the angle of the sun. After it gets some altitude to it, no problems. I'm sure there is a way to overcome that, but in my case, I'll just sleep in a little longer.
Buy a led strip bar it can be powered by a 12 volt battery and be attached to your sky screens upper disfuser. This will provide light for all circumstances. A six volt battery would probably work too just less light. There are more led bars, that was just a quick search and idea.