HP Lab Series User Manual

SLAVE N0.2
SLAVE
Figure
3-11.
Auto-Parallel,
Two
and Three
Units
maximum
to
avoid
having
the
slave
revert
to
con-
stant
current
operation:
this
would occur
if
the
master
output
cWTent
setting
exceeded
the
slave•
s.
3-44
AUTO-TRACKING
OPERATION
(See.Figure-3•12)
3 4 S
The Auto-Tracking configuration
is
used
when
it
is
necessary
that
several
different voltages
re-
ferred
to
a common
bus,
Vary
in
proportion
to
the
setting
of
a
particular
instrument (the control
or
master). A
fraction
of
the
master's
output voltage
is
fed
to
the
comparison amplifier of
the
.slave
sup-
ply,
thus
controlling
the
slave's
output. The
mas-
ter
must
have
the
largest
output voltage
efany
pow-
er
supply
in
the
group (must be
the
most
positive
supply
in
the
example shown
on
Figure
3-12).
3:-46
The output
voltage
of the
slave
is
a
percent-
age
of
the
master's
output
voltage, and
is
deter-
·mtnect by
the
voltage divider
eonsisting
of
Rx
(or~x
3-6
00
00
Ry
00
GNO
+
+S
AIO
SLAVE
NO.I
LOAD
SLAVEN0.2
Figure
3-12.
Auto-Tracking,
Two
and Three Units
and
Ry}
and
the
voltage
control
of
the
slave
supply,
Rp
where:
Es=
EM•
Rp/
(Rx+
Rp).
Tum-on
and
turn-off
of
the
power
supplies
is
controlled
by
the
master.
Remote
sensing
and
programming
can
be
used;
although
the
strapping
patterns
for
these
modes show only
local
sensing
and programming.
In
order
to
maintain
the
temperature
coefficient
and
stability
specifications
of
the
power
supply,
the
ex-
extemal
resistors
should
be
stable,
low
noise..
low
temperature
(less
than
30ppm per
0
c)
resistors.
3-47
SPECIAL
OPERATING
CONSIDERATIONS
3-48
PULSE
LOADING
•
•
3-49
The power
supply
will
automati~lly
cross
over
from
constant
voltage
to
constant
current
oper-
ation,
or
the
reverse,
in
response
to
an
increase
•
(over
the
preset
limit)
in
the
output
current
or
volt-

HP Lab Series Specifications

General

Brand	HP
Model	Lab Series
Category	Power Supply
Language	English