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Chapter 2
Electronics
2.3.3 Einzel Lens Electronics
(Voltage Divider Box, 4317251)
Overview
This assembly is a resistive tap off the source power supply that provides 50% of the source voltage to
the einzel lens. The Voltage Divider box is mounted on the side of the DE switch box enclosure
(Figure 2-26).
2
Voltage divider box
(not visible, along
side the DE switch box)
DE
switch
box
PB100853
Figure 2-26 Voltage Divider Box Location (Voyager-DE STR Left Cabinet Rear View)
Theory
The Voltage Divider box consists of an epoxy-potted plastic or metal box with two series-500 Mohm
resistors. The one end (top) of the resistors is connected to two HVPS (high voltage power supply)-type
Alden connectors. The other end (bottom) of the resistors is tied to the Voltage Divider Box ground lug.
The Voltage Divider Box ground is tied to the instrument frame ground through a braided cable.
WARNING
ELECTRICAL SHOCK HAZARD. Severe electrical shock can occur if the Voltage Divider box
ground lug is not grounded to the instrument frame. The ground lug carries high voltage unless
grounded. Failure to properly ground the ground lug can also damage the einzel lens.
The middle (50%) of the resistors is brought out to another HVPS-type Alden connector.
The two connectors at the top of the Voltage Divider Box (Figure 2-27 on page 2-45) allow you to
connect the source HVPS to the Voltage Divider Box and also to the DE switch box. The connector on
the bottom of the box provides a connection to the einzel lens.
2-44
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