There is only a narrow range angular where the prism works. It does not have repeated tuning ranges like a grating. It either is in the narrow range or it is not. It does not reverse as its moved, either.
Since on a Stab-lite you cannot install the prism upside down, that is not it.
As you turn the vertical knob, Does it still tune the whole "rainbow" of violets, blues, greens? If not, your prism is not tracking correctly, or the iris is not open wide enough and you need to repeat some of the alignment steps.
How much tube current are you running? If the plasma current is down low, you may not see 514.
I read your manual, the 2017 is the economy version and apparently Does NOT have Spectra's traditional rotary wavelength scale that moves on the vertical knob.. If you did, the dial rotates on the v adjust with a set screw and you could recalibrate it.
Did you accidentally unlock the course adjustment screws, which are factory set?
That leaves the wavelength calibration switch, which has nothing to do with the mechanical intra-cavity prism wavelength selection. If your referring to the sensor calibration thumb switch still reading 514 when lasing 488, that is not connected to the prism at all, it just sets the wavelength correction factor for the built in power meter. Your supposed to manually set the switch when you change wavelengths. It will not hurt anything, just be a 5-10% reading error on the meter dial.
Steve
Last edited by mixedgas; 06-26-2015 at 13:07.
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