Tektronix 475A User Manual

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REGULATING RANGE SELECTION
The Regulating Range Selector assembly located on the
rear panel contains the Regulating Range Selector Bar and
the line fuse (Figure 1). Verify
that the selector bar is set
for
the average line voltage being used and that the proper
line fuse
is installed. To change the regulating range:
1. Disconnect
the instrument from its power source.
2. Loosen the
two captive screws that hold the cover on
the selector assembly; then pull to remove the cover.
3. Pull
out the range selector bar. Select a range from
Table 1 which corresponds
to the average line voltage
and plug the selector bar
into the desired position.
4. Insert the proper fuse (selected from Table 2) into its
holder. Push the cover on and tighten the captive
screws.
Table 1
Regulating Ranges
Regulating
Regulating Range
Range Selector 115-Volt
230-Volt
Bar Position Nominal
Nominal
Upper Holes 108
to 132 volts
216 to 250 volts
Middle Holes
1
04 to 126 volts
208 to 250 volts
Lower Holes
99 to 121 volts
198 to 242 volts
Table 2
Fuse Selection
Line Voltage Selector
Switch Position Fuse Size
115-Volt Nominal
1.5
A, 3AG, Fast-blow
230-Volt Nominal
0.75 A, 3AG, Fast-blow
INSTRUMENT COOLING
To maintain adequate instrument cooling, the vent·
ilation holes
in the cabinet must remain open, and the air
filter must be cleaned or replaced when it gets dirty.
REV A AUG 1979
465B/DM44 Operators
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Tektronix 475A Specifications

General

Brand	Tektronix
Model	475A
Category	Measuring Instruments
Language	English