to
damage
from
moisture
and
fungus.
The
b. Keep the equipment in a warm, dry lo-
high
relative
humidity
causes
cation. If possible, keep the test set in a heated
when the temperature of the equipment drops
enclosure.
A
standby
heater
is
not
provided;
below that of the surrounding air. Adequate
therefore, leave the test set turned on if possi-
ventilation
will
minimize
this
condition.
Keep
ble.
the cover of the test set closed as much as
c. Allow the test set to warm up for 10 to
possible. Wipe all moisture and fungus from
15 minutes before testing tubes. The length
the exterior of the test set with a clean, lint-
of warmup time depends upon the temperature
free cloth.
of
the
surrounding
air.
d. I f e q u i p m e n t t h a t h a s b e e n e x p o s e d t o
Operation
in
Desert
Climates
the cold is brought into a warm room, moisture
Desert climates expose the test set to damage
will form on it and may cause fogging of the
from dirt, dust, sand, and the effects of strong
meter glass. Dry the equipment thoroughly.
sunlight. Provide means for keeping dust and
sand from entering the holes in the test sockets,
e. K e e p t h e c o v e r o f t h e t e s t s e t c l o s e d a t
adapters,
and
jacks,
and
from
accumulating
all times when the equipment is not in opera-
around the pushbuttons and other moving parts
tion. This will prevent an accumulation of
moisture within the equipment due to sweating.
of the test set. Clean and dust the equipment
frequently.
When
not
in
use,
keep
the
cover
29. Operation Under Tropical Conditions
closed to keep dust and dirt out of the exposed
Warm, damp climates expose the equipment
parts.
