Db Reference Impedance Power-Up Setting - Fluke 8050A Instruction Manual
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- Instruction manual (99 pages) ,
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- Instruction manual (106 pages)
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MAINTENANCE
ACCESS PROCEDURES
3.
Using your fingernail, pry the grey tabs on the
LCD bezel free from the screw posts and
remove.
4.
To reassemble, reverse the above procedures in
a logical order.
4-19.
BACKUP FUSE REPLACEMENT
4-20.
Use the following procedure to replace the backup
fuse (F2):
1.
Complete the Calibration Access procedure.
2.
Using a wide flat-blade screwdriver, pry the
fuse out from the fuse holder. (Refer to Figure
4-1 for the location of F2.)
3.
Replace thedefectivefusea3A, 600V fuse (mfg.
part no. BBS-3).
4-21.
AC LINE VOLTAGE SELECTION
4-22. The &050A is configured at the factory for a
specific ac line voltage. The configured ac line voltage is
listed on a decal located on the bottom of the unit. Line
voltage changes require the ordering of a new transformer
for the instrument. Refer to the Main PCB Assembly
parts list in Section 5 for the part number of the required
transformer.
NOTE
Instruments with Option 8050A-Ol
Rechargeable Battery use a different
procedure for changing the ac line voltage.
Refer to Section 6 for this procedure.
4-23.
Use the following procedure to change the ac line
voltage configuration on the &050A:
1.
Complete the Calibration Access procedure.
2.
Remove the transformer and replace it one for
the intended line voltage.
3.
Relocate the white wire (from the power
receptacle) to the pcb hole labeled with the
correct voltage.
4.
Remove the case and relabel the ac line voltage
designation on the decal at the bottom of the
instrument.
4-24. dB Reference Impedance Power-Up Setting
4-25. The following procedure sets the default (at power
up) dB reference impedance to anyone ofthe 16 available
impedances. In the standard configuration (no diodes
installed), the default reference impedance is 6000.
L
Complete the Display PCB Access procedure.
2.
Locate the diode mounting positions on the
Display PCB Assembly (just to the right of the
calibration access holes, viewed from the front
of the instrument).
3.
Refer to Table 4-2 and install diodes as shown
for the desired reference impedance.
4.
Reassemble the instrument.
Table 4·2.
dB
Impedance Selection
REFERENCE IMPEDANCE
CR8
CR9
CR10
CRn
50
-
-+rt-
-H-
-
75
-
-f+-
........-
-M--
93
....-oK-
-
-
110
-M-
-
-i+-
125
-M--
~
-
135
--K-
-
--M-
-1+-
150
-j+-
--M-
250
-t+-
--1+-
-
-+t-
300
--K-
.....w-
--1+-
-
500
-14-
--M-
--M-
-I+-
600
-
-
-
-
800
-
-
-14-
900
-
-
--M-
-
1000
-
-
.....w-
-t+-
1200
-
-14-
-
-
8000
-
-14-
I
-
-f+-
Diode
Type:
Use Fluke PIN 203323
(lN4448, lN914
or equivalent)
4-4
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