HP 6177B Operating And Service Manual
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3-32
REVERSE
VOLTAGE LOADING
3-39
Diode
CR34
is
connected
internally
across
the
supply".
Under
normal
operating
conditions,
the
diode
is
reverse
biased
(anode
connected
to
negative
terminal).
If
a
reverse
voltage
is
applied
to
the
output
terminals
(positive
voltage
applied
to
negative
terminal),
the
diode
will
conciuct,
shunt-
ing
current
across
it.
This
diode
protects
the
series
transistors
and
drivers.
3-40
REVERSE
CURRENT LOADING
3-41
k-.
active
load
connected
to
the
power
supply
3-6
may
actually·
deliver
a
reverse
current
to
the
power
supply
during
c
portion
of
its
operating
cycle.
An
external
source
cannot
be
allowed
to
pump
current
into
the
supply
without
loss
of
regulation.
Diodes
CR35
and
CR36,
connected
in
series
with
the
neg-
ative
output
lead,
protect
internal
components
from
damage
by
blocking
these
reverse
currents.
However,
to
avoid
regulation
degradation,
it
is
necessary
to
preload
the
supply
with
a'
dummy
load
resistor
so
that
the
power
supply
delivers
current
through
the
entire
operating
cycle
of
the
load
de-
vice.