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13
sEcTloN
2
MECHANICAL
DESCR IPTION
2.1
GENERAL
The
1061
has
been designed
to
be
either
rack
mounted
in
a standard
19"
rack
(3/'"
(2u) height
re-
quired)
or bench
top/portable
with
integral
tilt
stand'
An
exploded
view
of
the instrument
is
shown
in
Fig
2'1'
2.2 FRONT
PANEL
2.3 REAR
PANEL
The
rear
panel
incorporates
the
mains
supply,
power
input
socket and fuses, digital
and
analog
output
sockets,
rear and ratio signal input
sockets,
rear/front
panel
signal
input selection switch. run/calibrate
keyswitch,
calibration
interval
(errorl
select switch
and
current
option
fuse'
2.4
EXTEBNAL CONSTRUCTION
A screen
printed
key
designation
overlay
adheres
to
the
front
panel
retaining
the
polarising filter in
front of the
display.
Both
the
front and
rear
panels
are
held together
by
two
side
extrusions
running
from
front to
rear.
These
side
extrusions
provide
both
slots
for
the
handles or
rack
mounting
'ears'
and
locating
points
for the
structural
foam
covers.
The
bottom
cover is fitted
with
the
tilt-
stand,
rubber feet
and
instruction
card. Earth
screening
of
the covers and
guarding
is
provided
by aluminium
plates,
heat-staked
to
the inside
of the covers
with
electrical
connections
made
by spring
contacts.
2.5
INTERNAL
CONSTRUCTION
An internal chassis
is constructed
from
five
printed
circuit
boards, held together
by connectors
at
each
corner
and held rigid
by
two inner
aluminium
shíelds
fixed
hori'
zontally on the instrument's
centre
line running
from
front to rear. lnput terminals, switches
and display
are
mounted
on the
front
printed
circuit board
(pcb)
and
the
power
supply on the rear
pcb.
The
two side
and
centre
pcb's
are used
for
interconnections between
the
main
circuit boards.
All the
main circuit boards are mounted
on the
inner
shields
with
hinges and
quick
release fasteners
with
flexible
connections
to allow operation
in the
'hinged-up'position.
The Analog output
circuitry is
fixed
on
to the
rear
pcb
of
the
chassis and
the Ratio/Rear lnput
circuitry
on to
the
rear
panel.
The options
are mechanically
fitted and require
no
soldering.
The
chassis
is mounted on
to the side extrusions
with
nylon
screws,
spacers
and
an insulation
sheet to
ensure
that the
'electrical spacíngs'
of the
BSl,
UL
and VDE
specif
ications
are
achieved.
The f ront
panel
incorporates
the
signal
input
termin-
als, range, function,
mode, keyboard,
compute
and
power
switches
and
a
numeric/legend
gas
discharge
display'
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