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Dust in-instrument
The best way to remove dust inside the instrument is the
blowing of compressed air.
Remove persistent dust with
a soft painting brush and blow the air again.
CRT
The CRT screen will be smeared if it is used for too long
without the filter.
Ordinary dust of
finger print
left
on the CRT can be cleaned by a soft cloth.
Use a soft
cloth moisted with alcohol to remove persistent smearing.
·Filter
The filter may be clogged when used for a long time.
Dust or fingerprint can be cleaned with a dry soft cloth.
Use a soft cloth moisted with alcohol to remove persistent
smearing.
5-2 Visual inspection
The instrument should be inspected occasionally for such
defects as broken connections, improperly seated transistors,
damaged circuit boards, and heat-damaged parts.
The correc-
tive procedure for most visible defects is apparent ; howe-
ver, ~articular care must be taken if heat-damaged components
are found.
Overheating usually indicates other trouble in the instrument;
therefore, correcting the cause of the overheating is impor-
tant to prevent the recurrance of the damage.
5-3 Periodical Calibration
In order to use the oscilloscope accurately, periodical
calibration of circuit is essential.
When this oscilloscope
is used frequently, a calibration will be required at every
l,000hours of operation.
10
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