Mechanical Description; Frontpanel; Rearpanel; Internal - Datron 1061 Calibration And Servicing Handbook

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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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