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HP 6038A Service Manual

HP 6038A
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3-143
Output
on/off
is
particularly
useful
when
storing
values
for
later
recall.
(Note
that
output
on/off
is
the
only
pro¬
grammable
state
that
is
not
stored.)
With
the
output
off,
the
user
can
set
up
and
store
as
many
as
16
versions
of
the
com¬
plete
machine
state
without
having
the
output
change
to
a
par¬
ticular
set
of
values
until
that
setup
is
required.
3-144
The
state
of
the
output
on/off
function
may
be
read
by
sending:
OUT
?
and
addressing
the
power
supply
to
talk.
The
response
from
the
power
supply
is
in
this
format:
OUT
0
or
OUT
1
in
which
0
indicates
that
the
power
supply
output
is
off,
and
1
indicates
it
is
on.
3-1^
Foldback
Protection.
As
described
in
Paragraph
3-35,
foldback
protection
can
be
enabled
to
turn
off
the
power
supply
output
if
the
power
supply
switches
from
the
protected
operating
mode
(either
CV
or
CC)
to
the
other
mode.
If
the
power
supply
changes
to
the
specified
mode,
the
output
will
be
turned
off
and
the
DISABLED
and
FOLDBACK
indicators
will
turn
on.
To
prevent
nuisance
tripping
while
the
output
is
being
reprogrammed,
foldback
protection
is
inhibited
during
the
delay
period.
3-146
Foldback
protection
is
programmed
using
these
FOLD
OFF
or
FOLD
0
FOLD
CV
or
FOLD
1
FOLD
CC
or
FOLD
2
3-147
FOLD
CV
means
that
the
power
supply
should
be
operating
in
CC
Mode,
and
foldback
protection
will
turn
off
the
output
if
the
power
supply
switches
to
CV
mode.
FOLD
CC
means
that
foldback
occurs
if
the
power
supply
switches
to
CC
mode.
3-148
The
state
of
the
foldback
protection
function
may
be
read
by
sending:
FOLD?
and
addressing
the
power
supply
to
talk.
The
response
from
the
power
supply
is
in
this
format:
FOLD
0
or
FOLD1
or
FOLD2
in
which
0
indicates
that
foldback
protection
is
off,
1
indicates
that
foldback
protection
will
trip
if
the
power
supply
switches
to
CV
mode,
and
2
indicates
that
foldback
protection
will
trip
if
the
power
supply
switches
to
CC
mode.
3‘149
Reset.
Reset
restores
the
power
supply
output
if
it
has
been
disabled
by
OVP,
foldback,
or
remote
inhibit.
The
out¬
put
returns
to
the
present
voltage
and
current
settings;
the
values
may
be
changed
while
the
output
is
disabled.
The
power
supply
is
reset
with
the
command:
RST
3-150
Note
that
if
the
condition
which
caused
OVP,
foldback,
or
remote
inhibit
remains,
the
power
supply
output
will
be
disabled
again
after
reset.
If
the
power
supply
output
is
disabled
repeatedly,
check
that
the
OVP
setting
and
delay
time
are
appropriate
for
the
applicaion.
3-151
Hold
and
Trigger.
The
power
supply
contains
first-
rank
and
second-rank
storage
registers
for
values
of
voltage
setting,
current
setting,
foldback,
and
mask.
The
operating
values
are
stored
in
the
second
rank,
but
the
first
rank
can
receive
and
hold
different
values
for
later
implementation.
With
hold
turned
on,
values
in
first
rank
are
moved
to
second
rank
only
upon
receipt
of
a
trigger
or
device
trigger
command.
3-152
This
feature
allows
synchronization
of
multiple
in¬
struments
on
the
HP-IB,
and
also
ensures
that
new
values
are
implemented
at
the
same
time
within
a
single
instrument.
With
hold
turned
off,
values
are
loaded
Into
both
first
and
second
rank
when
received.
3-153
Hold
is
turned
on
and
off
using
these
codes:
HOLD
OFF
or
HOLD
0
HOLD
ON
or
HOLD
1
3-154
The
state
of
the
hold
on/off
function
may
be
read
by
sending:
HOLD?
and
addressing
the
power
supply
to
talk.
The
response
from
the
power
supply
is
in
this
format:
HOLD
0
or
HOLD
1
in
which
0
indicates
that
hold
is
turned
off,
and
1
indicates
that
hold
is
turned
on.
3-155
Values
that
are
held
in
first
rank
can
be
shifted
to
sec¬
ond
rank
(operating
values}
using
either
of
these
commands:
TRG
or
T
The
device
trigger
interface
command
will
also
shift
data
from
first
rank
to
second
rank.
3-156
Voltage
and
current
values
are
compared
to
soft
limits
before
being
loaded
into
either
first
or
second
rank,
and
new
soft
limits
are
compared
to
values
already
programmed
in
both
first
and
second
rank.
Any
discrepancy
between
first
and
sec¬
ond
rank
voltage
or
current
settings
and
voltage
or
current
soft
limits
will
result
in
an
error
condition.
3-157
The
power
supply
has
been
designed
to
allow
it
to
enforce
sequential
device
command
processing,
which
means
that
a
second
instrument
on
the
HP-IB
will
not
begin
to
receive
commands
until
the
power
supply
has
finished
processing
its
commands.
The
power
supply
can
accept
data
much
faster
than
it
can
process
data.
Therefore,
if
a
second
instrument
had
less
data
to
process
than
the
first
had,
the
second
instrument
could
start
changing
its
output
before
the
first
instrument
output
started
changing,
even
though
the
first
instrument
may
have
accepted
all
of
its
data
before
the
second
instrument
began
to
receive
its
data.
When
using
device
trigger
(an
HP-IB
interface
function),
the
HP-IB
interface
circuit
in
the
power
supply
will
not
finish
the
handshake
of
the
GET
message
(Group
Execute
Trigger)
until
all
commands
have
been
processed
and
the
trig¬
ger
action
has
been
completed.
The
controller
cannot
send
com¬
mands
to
a
second
instrument
until
the
handshake
is
completed
with
the
first.
Therefore,
sending
device
trigger
after
sending
a
command
assures
that
the
second
instrument
cannot
begin
to
receive
commands
until
the
first
instrument
has
processed
its
commands.
3-21

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HP 6038A Specifications

General IconGeneral
BrandHP
Model6038A
CategoryInverter
LanguageEnglish

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