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Overload and
Protection
the
All
with
exception of
ranges
the
volts and
20A range on AC and
the
full
scale display reading.
Voltage
have inherent protection. Resistance
ranges
voltage
electronic protection. Current ranges are
high
fuse
mounted
the
by
a
at
rear
blow ceramic or plastic body fuse
the guarantee.
void
No protection
is
incorporated on
used up
to
20A for periods
not
The meter
is
protected against damage
fully
connection
of high
voltages such
and (8). The following rules
should
(a) Never
connect
an input of greater
the
permissable overload for
select the
(b) Always
correct function and range before
connecting the
input.
(c) Never
connect the
meter to
current
function
selected.
is
(d) Take extra care
when connecting
since
unprotected.
it
is
ote
N
The
standard
leads and prods supplied with
suitable
for
currents
in
excess
of
the 2000
and
range on
AC
DC
current, can be used up to
have
ranges
protected
(11).
This fuse should be
2A fast
a
use of
slow-blow
—
a
type
the
10A range. This range can be
exceeding 10
seconds.
from accidental
line
across sockets
as
AC
however be observed.
the
than
maximum
range.
voltage source when the
a
the
to
10A
socket'(9)
the
meter are
5
amps.
Safety Precautions
The DM350 and DM450 have been
DC
standards
safety
the
recommend
following rules.
Never
1.
connect
common terminal
ground.
will
Never use anything but an
2.
instrument.
Use extreme caution
3.
disconnect power
Always
connecting
or
(7)
the
If
common terminal
the
10A
ground,
Never unplug
4.
connected
to
Use extreme caution
5.
withlive or'hot'
not
designed
but safe
operation depends
on
to the
voltage
instrument which
a
to
be raised more than
approved
adaptor
AC
when
working with
voltages
from
the
circuit being
disconnecting test
leads.
is
at
voltage
a
high
socket
will be at
the
same high voltage.
test
lead from
the
instrument while
a
high voltage.
a
when
working with AC-DC
chassis.
the highest
to
the
user, so
we
causes the
750
above
volts
power the
to
above 50V.
tested
whilst
with
respect
to
is still
it
equipment
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