Chronograph

[Megnphil]

Hi all I have an old combo cb 625 just measured velocity and got a reading of 560 fps but I'm not convinced has anyone had accuracy issues with these

 

[That hurts]

What gun, calibre and pellet weight as meaningless without knowing

 

[Megnphil]

What gun, calibre and pellet weight as meaningless without knowing

Thank you for reply but the question was has anyone had accuracy issues

 

[Trev81]

Thank you for reply but the question was has anyone had accuracy issues

I’ve had a couple and find they crap out if the sun is to bright

 

[That hurts]

Thank you for reply but the question was has anyone had accuracy issues

What do you mean by accuracy issues ... accuracy of the gun or the combro itself ? They are normally very reliable, which is why I was asking for gun, calibre and pellet weight as this would give us an idea of output.

 

[Buster321c]

Always had one , never found any problems with them tbh .

 

[Roy0110]

that particular chrono can be calibrated, that implies it may experience accuracy issues that could be fixed.
I have one somewhere, I could dig out the instructions and post here if that helps?

Obviously you will need another chronograph to cross reference.

EDIT: instructions can be found online…

How to Access Calibration Mode

1. Hold the RST button: Keep it pressed for approximately 10 seconds.
2. Watch the screen cycles: The display will cycle through the following options:
   • All segments on: (LCD test).
   • Blank screen: (Power off).
   • Pellet weight (GNS/GMS): To skip, continue holding.
   • Units (Gb/Eur): To skip, continue holding.
   • Legal limit (Limit): To skip, continue holding.
3. Release at "100": Stop holding the RST button when you see the calibration number (default is usually 100).

Adjusting the Values
Once you are on the calibration screen, use the other buttons to adjust the number:

• Lowering the number (toward 0):Makes the unit read faster.
• Raising the number (toward 199):Makes the unit read slower.
• Correction Scale: Each step represents a fine-tuning adjustment to match another known-accurate chronoscope.

Which Version Do I Have?
Not all models support this manual menu calibration. You can check your version by holding RST and watching the sequence:

• Version 1: Flashes two 4-digit numbers (serial number).
• Version 2: Stops after the "Legal Limit" screen.
• Version 3/4: Continues past the limit to show the Calibration number and then "Snd" (Serial output test).

Important Note: Many older units have a unique factory calibration number written in pencil inside the casing or on the manual. It is recommended to note this number down before making any changes, as it is the device's original reference point.