INSTRUCTION MANUAL - MODEL DLP
400-5-7
50A
—
7
C.
Slowly
turn
the coarse
and
fine
DC
load
adjusts
to
obtain
the
1A
load,
while
monitoring
the
source
voltage
on
the
front
panel
voltmeter.
D.
For
precision
settings
at
high
load currents,
it
is
desirable
to
use
an
external
voltmeter
con
nected
at
the
source
terminals
to
eliminate the
effects
of
lead
drops.
There
is
a slight voltage
drop
internal
to
the Dynaload,
due
to
the input
fuse and
internal
power wiring.
Similarly,
it
may
be
desirable
to
use external
ammeters
for
particular
tests
to
supplement
the
scales
of
the
Dynaload
or
for
use
at
very low
currents.
There
are
minor
leakage
currents
of a
few
milliamperes
in
the
Dynaload
instrumentation
which
do
not
pass
through
the
Dynaload ammeter
(voltmeter
current,
voltage
sensing
network)
.
The
resistive
load
characteristics of
the
Dynaload
simulate
a
pure
resistance
down
to
approximately
15V
input;
for
a
given
resistance
setting,
the current
is directly
proportional
to
the
voltage
over
wide
dynamic
ranges.
In
the
very
low voltages,
the
power
transistors
will
saturate.
3.2
CONSTANT
CURRENT
MODE
Some
power
sources,
such
as
variable
power
supplies,
are
rated
at
a
fixed
maximum
load
current
and
adjustable
over
a
predetermined
voltage
range
(for
example,
50-200V
@
1A)
. If the
resistive
load
characteristic
were
used
for
[ELMXL5-75QA]
