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CAUTION
Turn-off power supply before rearranging strap-
ping pattern
at
the
power supply rear
tenninal
strip. If the -S terminal is
opened
while the
power supply is
on,
the
output voltage and
cur-
rent may exceed their maximum
ratings and
re-
sult in damage to
the
load.
The
power
supply
will not be
damaged.
3-16.
Proceed
as
follows:
a
.
Tum-off power
supply and arrange rear terminal strapping
pattern
as
shown in figure
3-3.
The sensing wires will
carry
less
than
10 ma and need not be
as heavy as the load wires.
It
is
recommended that
sensing
and
load wires be
twisted
and
shielded
.
{If shield is used, connect
one
end to power
supply
negative
terminal
and leave the other end unconnected.)
CAUTION
Observe polarity
when connecting
the
sensing
leads to the load.
b. In order to maintain low
ac output
impedance,
a
capacitor with
a
mini-
mum rating of 4, 000µ.fd and 150 vdcw
should
be
connected across
the load using
short leads.
·
This capacitor must have high-frequency characteristics
as
good or
better than C 17 has {see parts list}.
c
.
Tum-on power
supply.
3-17.
REMOTE PROGRAMMING
3-18.
GENERAL. The constant
voltage and constant
current
outputs may
be pro-
grammed (controlled) from
a remote
location. The
front-panel
controls
are
disabled
in the following instructions
.
Changes in the
rear
terminal
strapping arrangement
are
necessary. The wires connecting
the
programming terminals
of the
power supply
to the remote programming device
should
be
twisted or shielded
to reduce noise
pick-up
.
(if
shield is used,
connect one
end
to power
supply ground
terminal
and
leave the other end unconnected.)
Remote
sensing (para
.
3-14) may be used
simul-
taneously with remote programming. However,
the
strapping patterns shown in
figures
3-4, 3-5,
and 3-6 employ only local
sensing
and do not show the load
connections.
3-3
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