TM 11-6625-214-12
Table 4-1. Operational Check Procedures - Continued.
Control Function
Proper Indication
8.
Adjust OUTPUT ATTEN. Control for desired output.
8. Observe operation of signal generator with auxiliary equipment
if available, and note any malfunction.
9.
MOD. SELECTOR switch to SQ WAVE.
9. Instrument operates on SQ WAVE. DBM/POWER SET meter
indication will change to between -2 and -4 DBM.
10.
Set SYNC SELECTOR switch to X10/PPS MUX 10.
Set PULSE RATE and PULSE
Set MOD SELECTOR switch to INT.
10. DBM/POWER SET meter indication will change with variation
WIDTH controls to extreme clockwise position.
of PULSE RATE and PULSE WIDTH controls, indicating
Adjust POWER SET control for maximum reading on
effectiveness of these controls.
DBM/POWER SET meter. Vary PULSE RATE and
PULSE WIDTH controls.
11.
Set MOD SELECTOR switch to EXT+. Connect video cord
DBM/POWER SET meter indication will vary just slightly above
from SYNC OUT connector to EXT MOD
ZERO SET with variation of PULSE RATE control, indicating
connector. Set PULSE RATE control to extreme
operation on EXT MOD position with positive external pulses,
clockwise position. Adjust POWER SET control for
SYNC OUT pulse.
maximum reading on DBM/POWER SET meter. Vary
and Existence of PULSE RATE control.
12.
Set MOD SELECTOR switch to INT FM. Set SYNC
DBM/POWER SET meter reading will decrease as control is
SELECTOR switch to X10/PPS MUX 10, PULSE
rotated beyond approximately midposition, proving existence
RATE control to 400. Increase FM AMPLITUDE
control from OFF to maximum clockwise position.
Table 4-2. Operator's Daily Preventive Maintenance Checks and Services for AN/URM-52(*)
D--Daily
W--Weekly
Time required: 0.4
Time Required:
Interval and
Work time
sequence No.
ITEMS TO BE INSPECTED
(T/H)
PROCEDURE
D
W
1
0.1
2
KNOBS, DIALS AND SWITCHES
Check for proper mechanical action by setting each control to
each of its possible settings. Action must be positive without
backlash, binding or scraping.
3
METER
Inspect meter for damaged and broken glass.
4
INDICATING LAMPS
5
OPERATION
0.2
6
CLEANLINESS
Unit must be clean and dry inside and out; free of grease, dirt,
0.1
Table 4-3. Operator's Weekly Preventive Maintenance Checks and Services for AN/URM-52(*)
D--Daily
W--Weekly
Time required:
Time Required: 0.2
Interval and
Work time
sequence No.
ITEMS TO BE INSPECTED
(T/H)
PROCEDURE
D
W
1
CORDS AND CABLES
0.1
2
LATCHES AND HANDLES
Check for looseness of latches and handles.
3
METAL SURFACES
Inspect exposed metal surfaces for rust and corrosion (para 4-9)
0.1
4-2