TM 11-6625-2616-14
Sequence
Item
Procedure
References
Preliminary. . . . . . . . . . .
4
Check power-selection switch position --------------------
Plug test lead set into front panel input jacks and short
5
Preliminary . . . . . . . . . . .
Para 25c, d, and e.
leads together.
Plug power cord into selected ac outlet.
Preliminary . .. . . . .
G
Depress the PWR ON pushbutton switch. Observe the read-
7
PWR ON switch. . . . . ......
out illuminate (six digits, a decimal point, and a polarity
sign).
Depress the AUTO RNG pushbutton switch. Observe that
8
AUTO RNG switch
the decimal is located in the readout as follows: XX. XXXX.
The digits displayed should be all zeros; however, if the
instrument has not been completely warmed up (approxi-
mately 30 minutes), or if it has not been adjusted for zero
Depress the AUTO RNG switch to bring it to the "out"
9
RNG CHNG switch
position. Depress the RNG CHNG switch several times.
Observe that the decimal moves each time the RNG
CHNG switch is depressed and that its locations are as
follows: XX.XXXX, XXX.XXX, and XXXX.XX.
10
Depress the R(%) switch and place the EXT REF VDC
R(%) switch
switch in the 101 position. The reading should be + or
120000. Depress the RNG CHNG switch several times.
Observe that the decimal moves each time the RNG
CHNG switch is depressed and that its locations are as
follows: 120.000, 1200.00, and 12000.0. Place the EXT
REF VDC switch in the 100-10 position. Observe that
depressing the RNG CHNG switch several times will
move the decimal to the following locations: 12.0000,
120.000, and 1200.00.
Sequence
References
Procedure
Item
No.
Check the outer covering (jacket) of the power cord for
1
Power
cord
cuts, cracks, or abrasions. Check connector for bent con-
tacts, cracked insulation, or evidence of arcing.
Check the outer covering (jacket) of the input cables for
2
Input cables
cuts, cracks, or abrasions. Check the insulation of the
conductors in the cables for damage. Check the jaws of
the alligator clips for good gripping action. Check the
banana plugs for corroded or deformed contacts which
would prevent good electrical contact with mating jacks.
Warning: A damaged input cable is a safety hazard and
should be replaced or repaired immediately.
Clean the exterior surfaces including the front panel and
3
Exterior surfaces
readout window.
Examine exposed metal surfaces for corrosion. Touch up
4
Metal
surfaces
paint as required.
Sequence
References
Procedure
Item
No.
Para 4-8c, (para
Clean interior of chassis
1
Interior of instrument
4-8b for access).
Para 4-8b for
Inspect terminals on power transformer for evidence of
2
Transformer terminals
access.
dirt or corrosion.
Para 4-8b for
Inspect input jack terminals for evidence of loose con-
3
Input jack terminals
access.
nections, dirt, or corrosion.
Inspect switch terminals for evidence of dirt or corrosion ..
4
Switch terminals
access.
Para 4-8b for
Inspect internal components (resistors, diodes, capacitors,
5
Components
access.
etc. ) for cracks, blistering, broken leads, dirt or corro-
sion.
