Tektronix 475A - Operating Voltage; Line Voltage Selection; Regulating Range Selection

OPERATING VOLTAGE
CAUTION
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This instrument may be damaged if operated with
the line voltage selector switch or the regulating
range selector set for the wrong applied line voltage
or if the wrong line fuse is used.
Line Voltage Selection
This instrument operates from either a 115-volt or a
230-vott nominal line voltage source, 48 to 440 hertz. To
convert from one nominal line voltage range to the other,
move the Line Voltage Selector switch (located on side
panel) to indicate the correct nominal voltage. A 115-to-
230 volt adapter may be required for the line-cord plug. Be
sure to use the correct line fuse for the line voltage
selected (see Table 1).
Regulating Range Selection
Tne Regulating Range Selector assembly (located on
the rear panel} is set for one of the line voltage ranges
shown in Table 1. It also contains the line fuse for overload
protection.
To change the regulating range:
1. Disconnect the instrument from the power source.
2. Loosen the two captive screws that hold the cover
on the selector assembly; then puil to remove the cover.
3, Pull out the range selector switch bar (see Fig. 1).
Select a range from Table 1 which is centered about the
average line voltage. Slide the bar to the desired position
and plug it in. Push the cover on and tighten the screws.
TABLE 1
Regulating Ranges
Regulating Range Ni
115-Volis 230-Volts
Nominal Nominal
Range Selector
Switch Position
lower holes)
CM (Switch bar in
middle holes)
Hi (Switch bar in
upper holes)
Fuse Size
_99 to 121 volts | 198 to 242 volts
104 to 126 volts 207 to 253 volts
216 to 264 volts
0.75 A 3AG
108 to 132 volts
1,5 A JAG
2
475A/DM44
Operators
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