CED M2 Chronograph problem- Help appreciated

Greetings all. Took my new CED M2 Chronograph out to the range to try it out, but alas, had problems.

Shooting conditions were: Desert range (Hard packed sand), bright sun to the right (4 o’clock position) relative to the sensors, clear sky, approx. 90 degrees, 5 – 7 mph wind. Fresh, new battery installed.

Rifle: Savage .308 bolt action, factory ammo.

Errors messages (From the manual):
E0 - Front sensor didn't read
E1 - Rear sensor didn't rear

I set the unit up according to the directions with the sensors 10 feet in front of the muzzle. I powered up the unit, shot a round and received an E1 (Rear) error. I couldn’t clear the error so powered down the unit, powered back up, and fired another round, which resulted in another E1 error. I repeated this several times, all with the same result- E1 error that I couldn’t clear. I then switched the input cables, fired a round, and received an E0 (Front) error. I then switched the sensors, insured the input cables were correct for front & rear sensor, fired a round, and received an E0 error. I couldn’t clear the error so powered down the unit, powered back up, and fired another round, which resulted in another E0 error. I again repeated this several times, all with the same result- E0 error that I couldn’t clear. I then switched the sensors again, moved them back to 15 feet from the muzzle, insured the input cables were correct for front & rear sensor, fired a round, and again received an E1 error. Throughout this testing/trouble shooting the constant has been the suspect sensor as it doesn’t read whether or not it’s in the front or rear, or whether the cables are correct in relation to sensor position or switched.

What do you think? Defective sensor? Thanx.

Cheers,

Mark

It could be the sensor but I bet Its the sun. On a bright california day with the sun off angle it can bugger the sensor. One of my sensors is more sensitive to it then the other. Look to see if the sun is directly impacting the sensor. In this case the sensor can have an issue seeing the shadow as the bullet passes over it. I dont think the E0/E1 errors clear until it captures a valid shot.

I ended up making a set of carboard shaders that mount close to the sensor to prevent the sunlight from getting in when the sun is lower in the sky. I only had to use them once though.

When I first got a Chrony I had a problem with a sensor not picking up. In my case two problem areas were causing the problem. Firstly, the Chrony wasn't far enough away from the rifle (getting muzzle blast) and secondly, the bullet path was either too close to the sensor (getting turbulence?) or to high above the sensors. I put a stick behind the Chrony and just off to the left of the center line with a mark on it. I aim at the proper height of the mark but just to the right of it so I don't put holes thru it and I am ligned up with the Chrony. I haven't had any problems since. Morning, evening, sunny, cloudy I get readings.

Hope this helps.

Thanx guys, I appreciate it. Alas, no matter what I try I keep getting an error from that same sensor. Took it out again Friday morning around 09:00 (Sun was at a low angle to the right front). Tried darkening the bullets with a black magic marker, placing a dark background (My gun case) under the sensors to reduce reflected light, and shaded that particular sensor. Nothing worked. :( Guess I'll call CED tomorrow and see about sending the sensor in for testing/replacement.

Cheers,

Mark