TM 11-6625-2575-14
tinuous operation within its ratings. No particu-
i. Readjust the AN/USM-203A controls as re-
lar procedure is required for standby operation.
quired for optimum presentation on the display
device.
k. Operation of the AN/USM-203A may be
discontinued by setting the power switch to OFF.
j. The AN/USM-203A is designed for con-
Section. III. OPERATION UNDER UNUSUAL CONDITIONS
18C. A 20-minute warmup time should be al-
3-5. Extreme Dry and Moist Heat
lowed for maximum stability,
No particular procedure is required to operate
b. Salt Air and Sea Spray. Operation in an
under conditions of extreme dry heat (up to
environment of salt air and sea spray requires
50C) or moist heat (up to 50C and 90%
that the instrument be protected completely from
humidity).
infiltration of these elements.
3-6. Extreme Cold, Salt Air and Sea Spray,
.
c. Sand and Dust. Operation in an environ-
Sand, and Dust
ment of sand and dust requires that the instru-
a. Cold Climate. No special procedure is re-
ment be protected from infiltration of these ele-
quired to operate in temperatures down to minus
ments.