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4.1 Hybrid Chassis
4.1.1 General
Please refer to Figure 4–1. The hybrid chassis is a 1
RU tall chassis holding up to 4 hybrids. It was
designed to extend back slightly further than the
carrier set so that its connections are easily acces-
sible. The hybrids themselves insert from the rear of
the chassis, sliding into horizontal card guides until
the test points protrude through the front panel. So
it is important to not run any wiring across the rear
of this 1 RU chassis that would prevent the hybrids
from being added or removed in the future. The
hybrids are held in place by 2 Captive mounting
screws on the hybrid connector plate. Empty slots
are covered with a blank cover plate that also
screws on.
Notes:
Hybrids are shipped with the following defaults:
1. Any empty chassis slots have blank rear cover
plates installed automatically & included in the
price of the chassis. Additional blank rear cover
plates must be purchased.
2. Viewed from the front, hybrids are inserted into
the chassis from left to right. Balanced hybrids are
first, followed by any skewed hybrids. Viewed from
the front, all optional boards are inserted from right
to left. If no Balanced hybrid exists, then the
Skewed hybrid will be in the left most slot.
4.1.2 Rear
There is a chassis ground stud (#8-32 screw) that
should always be grounded to earth ground using a
reasonably short #10 gauge wire or larger for
optimum surge protection. This ground connection
satisfies the Ametek requirement to have the shield
of the coax grounded when coming into the panel
before getting to the carrier sets. Although, if
desired, the customer may ground the coax shield
on a terminal block before coming into the hybrid.
Again, it is important to not run any wiring across
the rear of this 1 RU chassis that would prevent the
hybrids from being added or removed in the future.
Chapter 4. Chassis
Copyright © AMETEK Power Instruments
4.1.3 Front
The front of the chassis is standard for each of the 4
slots, except for optional boards. The test points are
either black or red in order to indicate which type of
hybrid is plugged into a particular slot. Any
optional board will have its own special label
covering the standard front slot label.
As noted on the front panel:
• Black test points extend through the front
panel for the Balanced hybrid or optional
board(s).
• Red test points are on the Skewed hybrid.
The red labels underneath the test points
apply to the Skewed hybrid only.
Please refer to Figure 4–1.
4.1.4 Mounting
The chassis has ventilation holes on the sides and
top/bottom.
Typically the chassis mounts flush to the front of
the panel. On chassis 1088-780 the flush mounted
brackets are integral to the unit.
But if desired, the unit can be projection mounted
by ordering chassis 1088-824 with separate (not
integrated) projection-mount angle brackets. The
two choices are listed under the hybrid accessories.
(See Chapter 1). The brackets may be turned
forward-facing or rear-facing depending on how
much projection mounting offset is needed.
Please refer to Figures 4–2 & 4–3.
Normal Operation
All Transmitters ≤ 15 W:
The chassis may be mounted without any space
separating it and the device above or below it.
High Power Operation
Transmitters > 15 W:
We recommend leaving 1 RU of space above and
below the hybrid chassis in order to operate at up to
60° C ambient temperature.
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