Ok thanks for the info I will make sure every thing is set right.The tuner doesn't need calibration, therefore there is no way to calibrate it. There is nothing that can drift to cause it to be miscalibrated.
A common source of tuning issues is mismatched clocks if you're using SPDIF I/O from the unit. Make certain the unit's world clock source is set to "INTERNAL". Or make sure your world clock source is putting out a 48 kHz clock signal.
See: https://wiki.fractalaudio.com/wiki/index.php?title=Tuner#Troubleshooting
Ok thanks for the info I will make sure every thing is set right.