Operation Under Tropical Conditions

damage

from

moisture

and

fungus.

The

b. Keep the equipment in a warm, dry lo-

high

relative

humidity

causes

condensation

cation. If possible, keep the test set in a heated

when the temperature of the equipment drops

enclosure.

standby

heater

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.

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

30.

Operation

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

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.