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REMOVAL OF
COVERS
WARNING:
DANGEROUS
AC VOLTAGES
ARE
EXPOSED
WHEN
COVERS
ARE
REMOVED
WITH
AC
SUPPLY
CONNECTED.
2-9
(1)
Set the
POWER
switch
to
'off,
switch
off
the
a.c. supply
at
the
supply point
and unplug
the
power
lead.
(2)
Remove
the
rubber plugs (located near
to
the rear
end) from both
side
panels
of the instrument
and
slacken,
by about
two
turns,
the
screws revealed.
(3)
Grip
the rear panel
assembly
and
ease
it
back
from
the
main
case
to
the
maximum
extent available (about 5
mm).
(4)
The
rear
edge
of either
cover can
now
be
lifted
and
the
cover
withdrawn
outwards
and
rearwards.
(5)
To replace
the
covers reverse the
above
procedure.
CONTACT
CLOSURE OPERATION
2.10
Contact
closure operates
in
DC
mode
and
uses the
'B'
input
socket
for
timing
and
the
'A'
input socket
for
totalizing.
An
external current
source with a
sink of
0.5mA
must be provided by the
user.
With
the
DELAY
switch
to
IN, contact
bounce
suppression of
up
to
10ms
is
provided
internally.
A
typical
contact
closure
arrangement
for
up
to+lOOV
supply
is
illustrated
below.
+
lOOV
Contact
Closure Supply
Fig.
4
9902
&
9906
Vol
.
1
2-6
FITTING
RACK
MOUNTING
KIT
(OPTION)
TYPE
11-1 126
2.11
(
1
)
Remove
the
bench
type
handle assembly
by
carefully prising
off
the plastic caps
from
the
handle
pivots,
and
then extracting the screws
which
secure
the
assembly
to
the unit
.
Store safely
for
possible future use.
(2)
Remove
me
rubber bungs referred
to
in
'removal
of covers'
procedure and
completely remove
the
two screv« revealed.
This
allows
the rear
panel
to
be
drown
away
from the side panels
(as far as
wiring
permits).
(3)
With
the rear
panel
drawn backwards,
slide
out the
trim
strips
from
the side
panels.
Store
them
safely
for
possible future use.
Then
refit
the rear
panel
and
secure
firmly with the
two
screws
removed
in
(2).
(4)
At
the
front
of the instrument,
remove
the
screw
securing
the front
panel
on
one
side
and
discard.
Refer
to
diagram below and
fit
bracket
(item
3)
using spacers
(items
10
and
11)
screws
(item 25)
and
washers
(item 19).
(5)
Repeat
(4)
on
the other side of the
front
panel
.
(6)
Fit
the
rack type handles (item
1)
to
the plates (item
5)
using
two
Taptite screws
(item 32)
to
each handle.
(7)
Fit
the plate assemblies
to
brackets on the
unit,
using
two
of items 15,
20 and 28
to
each
plate assembly.
Plan View:
Rack
Mounting
11-1126
Fig.
5
9902
&
9906 Vol.
1
2-7
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