Tektronix 47E5A

OPERATING VOLTAGE
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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- volt 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
The 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 pull to remove the cover .
3.
Pullout 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
Range
Selector
115-Volts. 230-Volts
Switch Position
Nominal Nominal
LO (Switch bar in
lower holes)
99 to 121 volts 198 to 242 volts
M (Switch bar in
middle holes) 104 to 126 volts 207 to 253 volts
HI (Switch bar in
upper holes)
108
to 132 volts 216 to 264 volts
Fuse Size
1.5 A 3AG 0.75 A 3AG
Fast-blow Fast-blow
2
475A/DM44 Operators
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