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3.
User Maintenance Routines
Maintenance routines performable by the unit operator are listed in this section. More advanced routines
(i. e. procedures involving repairs or adjustments within the instrument) should be referred to qualified
service personnel.
3.1
Cleaning
If the outside of the case becomes dirty or stained, carefully wipe the soiled surface with a rag moistened
with detergent, then wipe the cleaned surface with a dry cloth. In case of severe stain, try a rag moistened
with alcohol.
Do not use powerful hydrocarbons such as benzene or paint thinner.
Dust and/or smudges can be removed from the CRT screen. First remove the front case and filter (see
Figure 3-1). Clean the filter (and the CRT face, if necessary) by wiping carefully with a soft cloth or
commercial wiping tissue moistened with a mild cleaning agent. Take care not to scratch them. Do not
use abrasive cleanser or strong solvents. Let the cleaned parts air dry thoroughly and blur the waveforms.
Be particulary careful not to get fingerprints on the filter of CRT face.
3.2
Calibration interval
To maintain the accuracy specifications of the unit, calibration checks and procedures should be
performed after every 1000 hours of service. However, if the instrument is used infrequently, the
calibration checks should be performed every six months.
Fig. 3-1 Front Case and Filter
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