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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

 

Summary of Contents for DM-85T

Page 1: ...d 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 f...

Page 2: ...A 600mA 100 A 6A 1mA 10A 2 0 5 10mA Maximum voltage drop 200 mV for full range Maximum input current 10A within 10 seconds Overload protection 0 5A 250V fuse and 10A 250V fuse 3 2 5 AC Current ACA Ran...

Page 3: ...der test is less than 50 buzzer sounds continuously Open circuit voltage 2 2V Overload protection 250V DC AC peak value WARNING Do not input voltage at this range 3 2 10 Temperature Range Accuracy Res...

Page 4: ...function Press SELECT key to choose DC or AC measurement under ranges Under Diode Continuity range press SELECT key can choose diode test or continuity test Under temperature ranges press SELECT key...

Page 5: ...e circuit of the meter and the built in buzzer will alarm 2 Be careful while measuring a high voltage circuit DO NOT touch the high voltage circuit 4 4 DCA measurement 4 4 1 Insert the black test lead...

Page 6: ...not input any voltage at resistance range 4 7 CAPACITANCE MEASUREMENT 4 7 1 Insert the black lest lead in COM terminal and the red one in V mA terminal 4 7 2 Turn the rotary to switch to range 4 7 3...

Page 7: ...10 6 Press SELECT key to select the continyity measurement mode 4 10 7 Connect test leads to two points of tested circuit if the resistance is less than 50 the built in buzzer sounds NOTE 1 DO NOT in...

Page 8: ...e the cover Take off the old fuse and replace with a new one Install the back cover then fix the screws of the battery door and back cover Put on the holster 6 Trouble Shooting If the meter does not w...

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