B&K 281 - Page 12

с.
Set the RANGE switch to the desired voltage range. If in doubt
about the actual voltage amplitude to be measured, always use the
highest voltage range for the first measurement and adjust the
RANGE switch as required to obtain a satisfactory readout. If a
voltage greater than twice that indicated on the RANGE switch is
being measured the over range indication will become operative,
and the first digit will be blanked and the second and third digits
will
flash
on
and
off
together.
When
this
occurs,
a
higher
voltage
range must be selected. |
d.
Refer
to
Table
1
for
correct
interpretation
of
the
reading
displayed.
4.
DC
CURRENT
MEASUREMENTS
a.
Place
the
FUNCTION
switch
to
the
DCA
position.
b.
Switch
out
the
100
Kohm
resistor
in
the
test
probe.
с.
Place
the
RANGE
switch
to
the
desired
current
range
position.
CAUTION
Use
care
in
selecting
the
current
range
to
be
measured.
Make
sure
that
meter
is
inserted
in
series
with
the
load
in
which
the
current
is
being
measured.
Do
not
connect
the
meter
in
parallel
with
the
voltage
source
connected
to
the
load.
A
severe
current
overload
can
damage
the
current
shunts
provided
in
the
instrument.
When
connecting
the
multimeter
to
read
current
in
a
circuit,
the
power
to
the
circuit
should
first
be
removed.
The
following
rules
will
insure
that
the
propey
current
polarity
is
obtained.
(1)
When
inserting
the
test
leads
of
the
multimeter
on
the
positive
side
of
the
power
source
which
connects
to
the
load,
connect
the
positive
lead
of
ule
test
probe
assembly
at
the
voltage
source
and
connect
the
negative
lead
to
the
load.
(2)
When
inserting
the
multimeter
between
the
negative
power
source
terminal
and
the
load,
connect
the
negative
(black)
test
Ё
ead
to
the
negative
voltage
terminal
and
connect
the
positive
(red)
lead
to
the
load.
After
the
connections
have been
made
to
the
circuit
being
measured,
the
power
can
be
re-applied
and
the
measurement
performed.
If
the
polarity
of
the
current
being
measured
is
incorrect,
the
polarity
sensing
circuit
will
be
energized,
causing
the
first
digit
to
stay
on
and
the
second
and
third
digits
to
remain
off.
When
this
occurs
the
test
lead
connections
in
the
external
circuit
must
be
reversed,
after
first
removing
power
to
the
circuit
under
test.
If
the
magnitude
of
the
current
being
measured
exceeds
twice
the
amount
indicated
on
the
RANGE
switch
position
selected,
the
over
range
circuitry
is
energized,
causing
the
first
digit
to
remain
off
and
the
second
and
third
digits
to
flash
on
and
off
together.
When
this
occurs
immediately
remove
power
from
the
circuit
under
test
and
select
a
higher
current
range
before
proceeding
further.
10