04/03 347 LB 444
83
components. Attach the Mu-metal screen and fix it with screws, making sure that the
Mu-metal screen is only under light tension.
Re-assembly:
Set the crystal again onto the front face of the photo multiplier and twist both compo-
nents several times counter-clockwise. If you have to replace a component, apply 1 or 2
drops of silicone oil on the mating faces of the new and old component. It may also suf-
fice to press the new component against the mating face of the old one and to turn it
several times. Reassemble parts properly.
Just as after replacement of a complete detector, the calibration should be checked im-
mediately.
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