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Appendix 1
Light source replacement
Please follow the following procedures to replace the tungsten lamp and deuterium lamp:
Step one: turn the knob at the right lower bottom counterclockwise to make it vertical to the
cover
，
as shown in Fig. 7-1.
Fig. 7-1
Step two: loosen the two knobs at the right rear of the instrument.
Fig. 7-2
Step three: take off the right cover
Fig. 7-3
Step four: lift the display
，
loosen the screws of the light source cover and dismount it.
Be sure to turn off the power when replace the lamps. Otherwise, it
is dangerous.