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SECTION
4
USING
THE DATRON
4708
Preliminaries
Before
using the instrument
it
is
important
that
it
has
been
correctly installed
as
detailed
in
Section
2.
Limiting Characteristics
The
following
details
are
given
in
Section
6:
Function
Characteristics
All functions
Peak
terminal voltages
DC
Voltage
Ouq)ut
resistance
and
current
limit
AC
Voltage
Output
resistance
and
current
limit;
capacitive loading
limits
DC
Current
Maximum
load
resistance
and
maximum
compliance
AC
Current
Maximum
load
resistance
and
maximum
compliance
Resistance
Maximum
currents
and
accuracy
de-rating
factors
SAFETY
The 4708
is
designed
to
be
Class
1
equipment
as defined
in
EC
Publication
348 and
UL
1244, concerning
safety requirements.
Protection
is
provided
by
a
direct
connection
via the
power
cable
from ground
to
exposed
metal
parts
and
internal
ground
screens.
The
line
coimection
must
only
be
inserted
in
a
socket
outlet
provided with
a
protective
ground
contact,
and
continuity
of
the
ground
conductor
must be
assured
between
the
socket
and
the
instrument
WARNING:
ANY
INTERRUPTION OF
THE PROTECTIVE
GROUND CONDUCTOR
INSIDE
OR
OUT-
SIDE
THE
INSTRUMENT,
OR
DISCONNEC-
TION OF
THE
PROTECTIVE
GROUND
TER-
MINAL
MAY MAKE
THE APPARATUS
DAN-
GEROUS. INTENTIONAL INTERRUPTION
IS
PROHIBITED.
THE TERMINALS
MARKED
WITH THE
SYMBOL CARRY THE OUTPUT
OF THE
4708.
THESE TERMINALS
AND ANY OTHER
CONNECTIONS TO THE
LOAD UNDER
TEST
COULD CARRY LETHAL
VOLTAGES.
UNDER NO CIRCUMSTANCES
SHOULD
USERS
TOUCH ANY
OF THE FRONT
(OR
REAR)
PANEL TERMINALS UNLESS THEY
ARE
FIRST SATISFIED
THAT NO
DANGER-
OUS
VOLTAGE
IS
PRESENT.
CAUTION;
THE
A
SYMBOL
IS
USED
TO REMIND
THE
USER OF
SPECIAL
PRECAUTIONS
DE-
TAILED
IN
THIS
HANDBOOK
AND
IS
PLACED ADJACENT TO TERMINALS THAT
ARE
SENSITIVE
TO OVERVOLTAGE
CON-
DITIONS.
REFER
TO
SECTION
6.
Interconnections
Importance
of
Correct
Connections
The 4708
has been designed
for
use as an
accurate source
for
precision
calibration.
To
match
the external
circuitry
to
its
superior
specification,
it
is
essential to
take great care
in
making
connections
to
the
load.
Sources
of Error
Thermal
EMFs
These
can
give
rise to series
(normal)
mode
interference, par-
ticularly for
low
voltage outputs,
and where
large currents
have
a
heating
effect at
thermo-electric junctions.
Draughts
can
cause unbalanced cooling
in
an otherwise
thermo-electrically
balanced measuring
circuit.
E-M
Interference
Noisy
or
intense
electric,
magnetic
and
electromagnetic
effects
in
the vicinity
can
disturb the
measurement
circuit.
4-1
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