Fluke 6060B Instruction Manual page 167

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I
D
AMPLITUDE RANGE IN DBM
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AM O f f
7 . 0
1 . 0
I
.o
-5 . 0
-1 1
- 1 1 . 1
- 1 7 . 0
-23 - 1 -1 7 . 1
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- 2 9 . 1 -23 . 2
-35 . 1 -2 9 . 2
-41 . 1 -3 5 . 2
-47 . 1 -41 -2
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-53 . 2
-47 . 2
- 5 9 . 2
-
-6 5 . 2 -5 9 -3
-71 - 2 -65 .3
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-77.2
-7 1 - 3
-83.3 -77-3
-89.3
-83 . 4
95 .3
-89 . 4
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-
-1 01 -3
-
-1 07 - 4 -1 01 - 4
-1 1 3 . 4 -1 07 . 5
- 1 1 9 .4 -1 1 3 - 5
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- 1 2 5 . 4 -1 1 9 . 5
- 1 47 .0 -1 25 . 5
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ATTENUATOR
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6d8
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1 2dB
2 4d8 £1
24d8 £2
24dB £3
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24d8 £4
24dB £5
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40-44. Unleveled Condition
If there are self-test failures and/ or unleveled indications, the problem is probably in, or
prior to, the ALC loop. If the problem is isolated to a specific frequency band (or bands)
and other bands work properly, check signal inputs and controls to the various filters that
precede the modulator. See Table 40-7 Band, Filter, and Frequency Data for band
definition. If all frequency bands are affected, the leveling ALC loop or associated
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controls and inputs are probably at fault.
TP6 (modulator control voltage) is a good place to monitor. With the instrument
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programmed to + 1 3 dBm, the voltage on TP6 should be between +2V and +8V dc(+4V
to +5V de typical). Another place to monitor is TP7 (ALC control voltage). With the
instrument programmed to + 1 3 dBm, and the level correction disabled [SPCL] [8][ 1 ], the
Table 40-15.
ATTENUATOR SECTIONS INSERTED INDI CATED B Y X
A6DBL A12DBL A241 L A242L A243L A244L
A M O n
-s .o
1 9 -0 1 - 0 9 . 0
-s
6 . 9 0 . 9
0 - 9 -1 1 - 0 . 1
-5 - 1 -1 7 -0 -1 1 - 1
-23 - 1 -1 7 - 1
- 2 9 . 1 -23 . 2
-3 5 - 1 -29 . 2
- 41 - 1 -3 5 . 2
-53 . 2
-41 . 2
-47 . 1
-47 . 2
3
-59-2 -53 . 3
5 .3 -65 . 2 -59.3
-71 - 2 -65 .3
-83 -3
-77-2 -71 .3
-89.3
-77.3
- 83 - 4
-95 -3 - 89 . 4
-1 01 - 3 -95 . 4
9 4 -1 07 - 4 - 1 01 - 4
5
.
- 1 1 3 . 4 - 1 07 - 5
2 5
-1 1 9 -4 -1 1 3 . 5
-1 - 4 -1 1 9 - 5
-1 3 1 - 4 - 1 2 5 . 5
-147-0 - 1 3 1 -5
40-16.
Table
PROG LEVEL
+6dBm
OdBm
-1 2dBm
-1 2d8m
-1 2dBm
-1 2dBm
-1 2dBm
AHenuator Level Control
X
X
X
X
X
X
X
X
X
X X
X
X
X
X X
X
X X X
X X
X X
X X
X X
X
X
X X
X X
X X
X X
X
X X
X X
X
X X
X X
X X
X X X
X X X
X X X
X
AHenuator Levels
SPECIAL FUNCTION OBSERVED LEVEL
( NOMINAL)
+6dBm
OdBm
-1 2d8m
83 -1 2dBm
-1 2dBm
84
86
85 -1 2dBm
-1 2dSm
MAINTENANCE
TROUBLESHOOTING AND REPAIR
A245L
X
X
X
X
X X
X X
X
X
X X
X
X X
X X X
X X
X
X
X X
40-19