Model
6960
A
SECTION
III
OPERATING INSTRUCTIONS
Section
III
3-1
Operating
Controls
Figure
3-1
shows the functions of
the
front panel controls and terminals and
is
self-explanatory.
3-2
To
turn the instrument on, push
in
either of the range buttons, according to the voltage
and current which
is
desired. Accidental setting of both buttons,
18
V and 36
V,
will
cause
no damage to the unit;
in
this
case
the instrument has
been
switched to the
36
V - 300
mA
range. Pushing
in
the button marked OFF turns
the
instrument off.
3-3
Current
Limit Control
3-4
This knob adjusts the
peak
current output of the supply. The indication
is
nominal. To
set
the value exactly, remove
the
load
and
short
the
power supply terminals. Adjust the
.!i
....
m
CURRENT
LIMIT
control until the meter indicates
the
required maximum current.
#,
If
the
supply
is
to
be
used
in
an
application
where
the
current
drown from
the
instrument
is
not
essentially
unifotm
with
respect
to
time,
e.g.
in pulse
type
circuits,
then
the
fast
acting
character
of
the
current
limiting
circuit
must
be
taken
into
consideration.
The
average
current
may
be
within
the
supply
rating
or
below
the
maximum
current
set
with
the
CURRENT LIMIT
control,
but
peak
currents
moy
be
high
enough
to
cause
the
supply
to
clip.
The CURRENT
LIMIT
control
must,
consequently,
be
set
to a
value
which
is
greater
than
the
peak
current
requirements
of
the
circuit.
The
output
terminals
are
connected
internally
to
a
200
juF
capacitor
which
helps supply high
current
peaks,
provided
they
are
of
short
duration.
Any
exter-
nal
capacity
added
will
improve
the
peak
current
capability,
but
will
decrease
the
safety
provided
by
the
current
Iimit
control.
High
range
currents
may
then
destroy
external
components
before
the
average
current
inside
the
supply
;11'
increases
sufficiently
to
cause
the
limiting
circuit
to
operate.
3-1
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