DM
-
85T
DIGTAL
MULTIMETER
Operation
Manual
CONTENTS
GENERAL
DESCRIPTION
……………………………
SAFETY
PRECAUTIONS………………………………
FEATURES
…………………………………………
OPERATION
INSTRUCTION…………………………
MAINTENANCE
…………………………
TROUBLE
SHOOTING
…………………………
1.
General
Description
This
is
a
3
1/2
digital
multimeter
with
high
stablility
and
performance.
It
uses
a
LCD
with
20mm
high
figure,
which
makes
the
reading
clearer
and
the
operation
more
convenient.
It
can
test
DCV,
ACV,
DCA,
ACA,
resistance,
capacitance,
frequency,
NCV,
duty
cycle,
temperature,
diode,
and
continuity.
This
meter
also
designed
with
functions
including
unit
symbol
display,
data
hold,
lighting,
auto
range,
auto
power
off
and
warning
functions.
To
assure
high
accuracy
and
resolution,
it
adopts
integrated
circuit
8
‐
bit
microprocessor
and
a
dual
integral
A/D
conversion
as
LCD
driver,
giving
high
resolution
and
high
accuracy.
It
is
an
ideal
tool
for
labs,
factories
and
radio
‐
technology.
2.
Safety
Instructions
The
instrument
is
designed
in
compliance
with
IEC1010
standard
(safety
standard
issued
by
International
Electro
technical
Committee).
Please
read
the
following
safety
instructions
before
operation.
2.1
Check
the
connection
and
insulation
of
test
leads
to
avoid
electric
shock.
2.2
To
avoid
electric
shock
and
damage
to
the
meter,
do
not
input
voltage
exceeding
rated
value.
2.3
When
measuring
voltage
higher
than
DC
60V
or
AC
40V,
please
be
careful
and
avoid
electric
shock.
2.4
Select
correct
function
and
range
to
avoid
wrong
operation.
2.5
Move
the
test
leads
away
from
test
points
when
switching
to
other
function.
2.6
Don’t
input
voltage
in
current
terminal.
2.7
Don’t
make
any
modification
to
the
circuit.
It
may
damage
the
meter
or
jeopardize
safety.
2.8
Safety
symbols:
“
”
High
voltage,
“ ”
GND,
“ ”
Dual
insulation,
“
”
Refer
to
manual,
“ ”
Low
battery
indication.
3.
Features
3.1
General
Characteristics
3.1.1
Display:
LCD;
3.1.2
Max
display:
6000
(3
5/6
digits,
automatic
polarity,
and
unit
symbol
display);
3.1.3
Measurement
method:
Analog
to
digital
converter
(in
micro
processor
ADC+MCU);
3.1.4
Sampling
rate:
approx.3
times/sec.
3.1.5
Over
‐
range
display:
“OL”
displayed.
3.1.6
Low
battery
indicator:
“ ”
3.1.7
Working
environment:
(0
～
40) ,
relative
humidity:
<80%
℃
;
3.1.8
Store
condition:
(
‐
10
～
50) ,
relative
humidity:
<80%
℃
3.1.9
Battery:
2
pieces
1.5V
battery
(“AAA”
7#
battery);
3.1.10
Dimension:
140×72×37mm
(length
x
width
x
height);
3.1.11
Weight:
approx.
195g
(including
battery);
3.1.12
Accessories:
test
leads,
TP01
thermocouple,
user
manual,
holster,
gift
box,
and
2*1.5V
batteries.
3.2
Technical
Features
3.2.1
Accuracy:
±
(a%
×
reading
+
digits).
To
assure
accuracy,
the
ambient
temperature
should
be
(23±5)
℃
,
relative
humidity
<75%.
One
year
accuracy
is
guaranteed
since
production
date.
3.2.2
DC
Voltage
（
DCV
）
Range
Accuracy
Resolution
600mV
±(0.5%+4)
0.1mV
6V
1mV
60V
10mV
