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|  MIL-T-48621A (AR)
Repeat steps l.(2) and l.(3) (with the OPER/TEST switch
m.
set to the band under test) for BANDS 1 and 3.
Noise out.
4.7.
3.5
a.
Connect the NOISE OUT port of the noise tester to the
oscilloscope (Item 35, Table III) Input terminated with
50 ohms, using a BNC tee fitting (item 36, Table III)
and a 50 ohm load (item 15, Table III).
Set the MODE switch to EXT TEST position.
b.
c.
Set the OPER/TEST switch to +12 VB
d.
AdjuSt
the
REF
LEVEL
for
VOlt
peak-tO-~ak
0.8
control
as indicated on the oscilloscope (item 35, Table III).
e.
Disconnect oscilloscope (item 35, Table III) from the
NOISE OUT port and connect J1 of the calibrated divider
network (item 39, Table III) in its place. Connect the
oscilloscope (item 35, Table III) to J2 of the
calibrated divider network. Note: Do not use 50 ohm
termination and BNC tee fitting. Set oscilloscope VERT
CAIN switch to 5mV/Div and Time/Div switch as required
for at least one cycle/D$v.
..
f. Set the divider network bandswitch to proper position
-
for band-under-test and the INPUT-OUTPUT switch to
OUTPUT position. Set noise tester OPER/TEST switch to
position A for the band-under-test as Indicated in the
following chart. Using the oscilloscope as an
indicator. adjust REF LEVEL control to obtain exactly
six divisions.
Set OPER/TEST switch to position B for the
9"
band-under-test as indicated In the chart below. Set
divider network INPUT-OUTPUT switch to INPUT position.
Observe oscilloscope for proper indication - 5.35 to
6.75 divisions vertical deflection.
This indicates that
the noise tester internal attenuators are properly
adjusted.
OUT)
(ATTEN IN)
(ATTEN
BAND
POSITION A
POSITION B
.
1
+12VA
BD1 Test
2
+12VB
BD2 Test
3
MTR off
BD3 Test
Repeat steps e. through f. for the remaining two bands.
h.
35
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