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SECTION
3
PREPARATION FOR USE
UNPACKING
1
Unpack
the
instrument
carefully
to
avoid
unnecessary
damage
to
the factory packing.
If
it
becomes
necessary
to
return the
instrument
to
Racal Instruments
for
calibration
or
repair,
the original
packaging should be
used.
If
this
is
not
possible,
a strong shipping container
should
be
used.
Ensure
that
sufficient
internal
packing
is
used
to
prevent
movement
of
the
instrument within
the container
during
transit.
2
The
MBA
link
(LK3)
is
normally
set for
operation
on
VXI
Revision
1.3
(i.e.
link open).
Reposition link
(i.e.
link closed)
for
operation
on
VXI
Revision
1.2.
SETTING
THE LOGICAL ADDRESS AND INTERRUPT
PRIORITY
SWITCHES
3
Set the Logical address
in
the
range
1
to
254
(decimal)
by
setting the
two
switches
to
the
hexadecimal
equivalent.
To
set
the switches use a small
flat
bladed
screwdriver.
See
TABLE
3.1 for
the decimal
to
hexadecimal
conversion.
4
Set the Interrupt
Priority in
the
range
1 to
7
by
setting
the switch
to
the required
number,
use a small
flat
bladed
screwdriver.
Do
not
attempt
to
set this
switch
to
positions
8,
9
and
0.
INSTALLATION
5
After
setting the Logical
Address and
Interrupt
Priority
Switches,
install
the
instrument
in
the
chassis.
Insert the
instrument
in
its slot,
ensuring
that
it is
correctly located in
the
runners,
and push
it
gently
into
the
chassis until the
instrument plugs
(PI
and
P2) connect
with
their respective sockets at
the rear
of
the
chassis.
Lock
the
instrument
in the chassis
by
tightening the locking screws
at
the top
and
bottom
of
the
instrument
front
panel.
Ensure
that the
LACK
daisy chain
jumpers
or
switches are
open
for
the appropriate
slot
(see
chassis instructions).
Connection
to
the
VXI
6
Connection
to
the
VXI
is
made
via
two
96
pin connectors (Pi
and
P2)
mounted
on
the rear
edge
of
the
instrument
board.
The
pin
assignments
are
given
in
TABLE
3.2
and
TABLE
3.3.
FREQUENCY STANDARD
7
Three frequency
standards
are available
for
use, these
are the
instruments
own
internal
frequency standard,
a
10
MHz
standard connected
to
the
EXT.
STD
connector
or
the
CLK10
standard.
The
CLK10
standard
is
selected
under program
control.
The
connection
for
the
external
standard should be
made
using
coaxial
cable.
Switch on
the
frequency standard
and
the instrument.
2151
OPS
A1571/DA
AL01/Iss.01/03.94
3-1
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