Model 6960 A
3-5
Connections to Load
Section
III
3-6
The load may be
connected
to
either
the
front or
rear
output
terminals
of
the
power supply as shipped from
the
factory.
Sensing
of
the
output
voltage
is
auto-
matically
accomplished in both modes
of
operation.
The user should realize that the specifications describing the electrical characteristics
of
the power supply are given for measurements made directly at the
terminals.
Long
leads between instrument and load
deteriorate
load
regulation,
which
can
only
be
maintained
within
the
specifications
of
the
power supply by
using remote sensing as described
later
in
this
section
of
the
manual.
3-7
Automatic Parallel
Operation
3-8
Automatic
parallel
operation
as used here
is
defined
as a
parallel
operation
of
two
or
more power supplies with
one
unit
(the master)
acting
as a control
unit
and
the
additional
units (the slaves)
acting
as
controlled
units,
where
each
supply
automatically
provides an equal share
of
current.
Each Model 6960A
can
be used
as master or
slave
un
it.
The connections
of
the
supplies have to be made in
accordance
with Fig.
3-2
C.
NOTE
All
un
its must
operate
on
the
same
voltage
range
(0-
18V
or
0-36
V)
!
Turn on
the
master
unit
first, then
the
slave
units.
Each supply will share
the
load
current
and
the
master
unit
will
automatically
limit
the
voltage
and
the
current
for
all
units.
Each slave unit sti
II
maintains its own short
circuit
protection
and
should be set
to a
current
limit slightly
greater
than the maximum
current
set
on
the
master
~i:;'
unit.
If
the
slave
unit was
set
to a current limit
slightly
greater
than
the
master
un
it and if
the
slave
un
it was turned on first,
the
equipment under test might
be damaged by excessive
current
before
the
master
unit
was turned on and took
over
the
current
control.
3-9
Automatic Series
Operation
3-10
Two
or
more supplies may be
operated
in
series to
obtain
a higher
voltage
than
that
obtainable
from
a single
supply.
One
unit
(the master)
acts
as a control
unit,
which controls the
additional
units (the
slaves).
The master will
set
the
total
output
voltage
with
each
unit
contributing
the
same amount
of
voltage.
Any Model 6960A may be used as master
or
slave
unit.
Connect the
output
terminals
of
the units
so
that
the
two
terminals
of
the
master are the most negative
of
all. The arrangements
of
interunit connections
are
shown
in
Fig.
3-2
b for two units
and
in
Fig.
3-2
d for
three
or more
units.
The
connection
beween -S
of
the
master
and
A
2,
A 3
of
the first
slave
has
to be
done
by
means
of
a
10
K
0/0.5
W
resistor.
3-3
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