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8.3 Lamp Replacement
The lamp may need to be changed after several thousand hours of use. Generally the instrument will
exhibit high noise during Performance Test, or when wavelength precision (repeatability) has begun
to rise from established values. Follow this procedure:
1. Turn off Instrument power and unplug
AC power cord from AC receptacle or
supply.
The “O” position is OFF.
Allow the instrument to cool for about
15-20 minutes before attempting to
change the lamp.
2.
On the back side of the instrument,
loosen the eight (8) captive
thumbscrews that secure the lamp
cover in place.
3. Loosen the screws holding the wire
terminals onto the terminal strip. Do
not remove these screws. One or two
turns counter-clockwise is sufficient.
Pull the wire connectors out from under
the screws.
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