Tektronix 5441 Instruction Manual page 24

Operating Information-5441 lR5441
3. To convert from 120 V to 220 V nominal line voltage,
or vice versa, remove the line-selector block from the
square-pin connectors (see Fig. 2-3) and replace it with the
other block. Remove the line fuse from the fuse holder locat-
ed on the rear panel and replace it with one having the cor-
rect rating. The unused line-selector block and line fuse can
be stored on the Power Supply circuit board. Change the
line-cord power plug to match the power-source receptacle
or use an adapter.
NOTE
The 120 V block is color coded brown, and it connects
the transformer primary windings in parallel. The
220 V block is color coded red, and it connects the
primary windings in series.
4. To change regulating ranges, place the line-selector
block on the desired set of square pints. Select a range that
is centered about the average line voltage to which the in-
strument is to be connected (see Table 2-2).
5. Change the nominal line-voltage information on the
rear panel of the instrument. Use a non-abrasive eraser to
remove the previous data, and mark in new data with a
pencil.
6. Replace the bottom dust cover and apply power to
the instrument.
C A U T I O N
Damage to the instrument may result from incorrect
placement of the line-selector block.
Fig. 2-3. Location of the line-selector block on the Power Supply
circuit board.
Table 2-2
REGULATING RANGES FOR POWER TRANSFORMER
2-10
REV DEC 1983
Line
Selector
Block
Position
L
M
H
Line Fuse
Regulating Range
120 V Nominal 22 V Nominal
9 0 V a c t o l l O V a c
9 9 V a c t o 121 V a c
108Vac to 132Vac
1.25 A slow-blow
1 8 0 V a c t o 2 2 0 V a c
1 9 8 V a c t o 2 4 2 V a c
216Vac t o 2 6 4 V a c
0.7 A slow-blow