&
Ol'ERAnNG
3·3.
ACmV,
ACY,
AC+DCmV,
AC+DCV
1)
Rotate the Rotary
se
lector
switch
to
mV
or V position,
and
then
pr
es
s
the
ALT-
F key to display
the
AC
annunciator
on
the
left side of
the
LCD
see fig. 3
& 6
on
page
36) Pressing
the
ALT
-F key again will display
the
annunciators for both
AC
and
DC
lhis
is
for the
AC
+ DC true
RMS
mode.
Pressing
the
ALT-F
key 3 consecutive times will cycle
th
e meter
through
the
3 voltage
modes
(DC,
AC,
AC
+ DC)
2) Attach
the
probe
tips to
the
voltage source.
3)
The
voltage
measur
eme
nt
will
appear
on
the
display.
4)
The
Bar
graph
will
display
the
voltage
va
lue
as a
binary
bit expression.
S) H
the
measured
voltage
is too hig
h,
the
measurement
range will be
changed
automatically to the
next
higher
range.
When
the measured
voltage is greater
than
the
highest
range
the
display will read "
OL
".
6)
Th
e
secondary
digit display will
read
the
decibel value
based
on
600
OHM
ifrlpedance calculated
by
the following formula.
dBm = 20 log(V 1
0.
7746)
3·4.
DCUA,. DCMA, DCA
1) Select uA, rnA
or
A
with
the
rotary
switch.
2) Press
the
ALT-F
key to
se
lect DC
if
necessary.
3) Break the circuit
where
the current
i~
to be measured.
4)
Connect
the
two test l
ea
ds
to
complete
the
broken
drcuit.
S)
If
the
measured
current
is too high,
th
e display will indicate
"OL".
In
this case,
the
higher
current
range
(rnA
or
A)
should
be
selected.
6)
The
bar-graph
segments
will
indi
cate
th
e
measured
val
ue
as a
binary
sequence.
7)
Th
e secondary display
will
show
the
shunt
resister value for calculating
the insertion voltage drop
caused
by meter
using
the formula
V=
IR
.
&.
8) The
"A"
input
socket has a special function
designed
for safety, which is
called
the
"WARNING BEEP".
When
the
rotary
switch
is
set
up
to
any
function other than the
"Am
ps
", inserting the te
st
leads
in
the
"Amps"
socket will cause the
warning
beeper
to
sound.
The
itA
(Amp)" input terminal allows current measure
ment
continuously
up
to
SA
or
within 3 minutes for currents to
lOA.
Successive high current
measurements
above
SA
require 10 minutes
of
cooling
time
between
measurements.
WARNING
DO
NOT
MEASURE
HIGH
CURRENT
OF
MORE THAN
lOA
TO
AVOID
OPENING
THE
FUSE
OR
OVER HEATING
THE
PCB
10
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