PDi DM68 Instruction Manual

HANDHELD
DIGITAL MULTMETER

OPERATOR'S
INSTRUCTION MANUAL

Table

of

Contents

TlTL

E

PAGE

1.

GENERAL INSTRUCTIONS

1

1.1

Precaution safety measures

1.1 .I

Preliminary

1.1.2

During use

1.1.3

Symbols

1.1.4

Instructions

2.

DESCRIPTION

6

2.1

Instrument Familiarization

2.2

LCD Display

2.3

Key pad

2.4

Rotary switch

2.5

Terminals

2.6

Accessories

11

3.

FUNCTION DESCRIPTION

12

3.1

General Functions

12

3.1

.I

DATA HOLD mode

12

3.1.2

Manual ranging and Autorange mode

12

3.1.3

Battery saver

13

3.2

Measurement Functions

3.2.1

AC and DC Voltage measurement

I

3.2.2

Resistance measurement

3.2.3

Diode Test

3.2.4

Continuity Check

3.2.5

Capacitance measurement

3.2.6

Frequency measurement

3.2.7

Transistor measurement

3.2.8

Current measurement (with clamp,optional)

19

3.2.9

Current measurement

20

Table of Contents

4.

TECHNICAL SPECIFICATIONS

4.1 General specifications..

4.2 Measurement specifications

4.2.1 DC Voltage

4.2.2 AC Voltage

4.2.3 Resistance

4.2.4 Diode Test

4.2.5 Continuity Check

4.2.6 Transistor

4.2.7 Capacitance

4.2.8 Frequency

4.2.9 Current (with clamp. optional)

4.2.10 DC Current

4.2.11 AC Current

5.

MAINTENANCE

5.1 General maintenance

5.2 Battery and fuse replacement

6.

HOW

TO USE THE HOLSTER

PAGE

21

21
22
22

22

23
23
23
23
24
24
24

.25

25

1. GENERAL INSTRUCTIONS
This instrument complies with IEC 1010-1

(61010-l@IEC:

2001), CAT. II 1000V and CAT. Ill 600V overvoltage standards.
See Specifications.
To get the best service from this instrument, read carefully this
user's manual and respect the detailed safety precautions.
International symbols used on the Meter and in this manual

I

are explained in chapter 1

.I

.3

1

.I

Precautions safety measures

1.1.1

Preliminary

Measurement category

Ill is for.measurements performed in

the building installation.

NOTE: Examples are measurements on distribution boards,
circuit-breakers, wiring, including cables, bus-bars, junction
boxes, switches, socket-outlets in the fixed installation, and
equipment for industrial use and some other equipment, for
example, stationary motors with permanent connection to

the fixed installation.

Measurement category II is for measurements performed on
circuits directly connected to the low voltage installation.

NOTE: Examples are measurements on household
appliances, portable tools and similar equipment.

*

Measurement category I is for measurements performed on
circuits not directly connected to MAINS.

NOTE: Examples are measurements on circuits not derived
from MAINS, and specially protected (internal) MAINS
derived circuits. In the latter case, transient stresses are
variable; for that reason, requires that the transient
withstand capability of the equipment is made known to the
user.

'

When using this Multimeter, the user must observe all

normal safety rules concerning:

-

protection against the dangers of electric current.

-

protection of the Multimeter against misuse.

For your own safety, only use the test probes supplied with
the instrument. Before use, check that they are in good
condition.

1.1.2

During use

If the meter is used near noise generating equipment, be

aware that display may become unstable or indicate large
errors.

'

Do not use the meter or test leads if they look damaged.

Use the meter only as specified in this manual; otherwise,

the protection provided by the meter may be impaired.

Use extreme caution when working around bare conductors

or bus bars.

*

Do

not operate the meter around explosive gas, vapor, or dust.

Verify a Meter's operation by measuring a known voltage.

Do not use the Meter if it operates abnormally. Protection
may be impaired. When in doubt, have the Meter serviced.

Uses the proper terminals, function, and range for your

measurements.

When the range of the value to be measured is unknown,

check that the range initially set on the multimeter is the

highest possible or, wherever possible, choose the

autoranging mode.

'

To avoid damages to the instrument, do not exceed the

maximum limits of the input values shown in the technical
specification tables.

"

When the multimeter is linked to measurement circuits, do

not touch unused terminals.

2

Caution when working with voltages above 6OVdc or 3OVac

rms. Such voltages pose a shock hazard.

When using the probes, keep your fingers behind the finger

guards.

When making connections, connect the common test lead

before connecting the live test lead; when disconnecting,

.

I

disconnect the live test lead before disconnecting the
common test lead.

Before changing functions, disconnect the test leads from

f

the circuit under test.

For all dc functions, including manual or auto-ranging, to

avoid the risk of shock due to possible improper reading,
verify the presence of any ac voltages by first using the ac
function. Then select a dc voltage range equal to or greater

than the ac range.
Before attempting to insert transistors for testing. always be
sure that test leads have been disconnected from any
measurement circuits.

.

'

Components should not be connected to the hFE socket

when making voltage measurements with test leads.

Disconnect circuits power and discharge all high-voltage

capacitors before testing resistance, continuity, diodes, or

capacitance.

Never perform resistance or continuity measurements on

live circuits.
Before measuring current, check the meter's fuse and turn

off power to

the circuit before connecting the meter to the

circuit.

*

In N repair work, or when carrying out measurements on

power switching circuits, remember that high amplitude

voltage pulses at the test points can damage the multimeter.

Use of a

TV

filter will attenuate any such pulses.

3

*

Use the

9V

NEDA battery, properly installed in the Meter's

battery case, to power the Meter.

Replace the battery as soon as the battery indicator

(

a

)

appears. With a low battery, the Meter might produce false
readings that can lead to electric shock and personal injury.

Do not measure voltages above

600V

in Categoly

Ill,

or

lOOOV

in Category

I1

installations.

Do not operate the Meter with the case (or part of the case)

removed.

1.1.3

Symbols:

Symbols used in this manual and on the instrument:

Caution:

refer to the instruction manual. Incorrect

use may result in damage to the device or its

components.
Dangerous voltage may be present.

w

AC (Alternating Current)

-

-

-

-

DC (Direct Current)

&

Earth ground
Double insulated

8

Fuse

C

<

Conforms to European Union directives

1.1.4

Instructions

Remove test leads from the Meter before opening the Meter

case or battery cover.

'

When sewicing the Meter, use only specified replacement

parts.

"

Before opening up the instrument, always disconnect from

5

all sources of electric current and make sure you are not
charged with static electricity, which may destroy internal
components.

Any adjustment, maintenance or repair work carried out on
the meter while it is live should be carried out only by
appropriately qualified personnel, after having taken into
account the instructions in this present manual.

'

A "qualified person" is someone who is familiar with the
installation, construction and operation of the equipment
and the hazards involved. He is trained and authorized to
energize and de-energize circuits and equipment in
accordance with established practices.

'

When the instrument is opened up, remember that some
internal capacitors can retain a dangerous potential even
after the instrument is switched off.

*

If any faults or abnormalities are observed, take the
instrument out of service and ensure that it cannot be used
until it has been checked out.

*

If the meter is not going to be used for a long time, take out
the battery and do not store the meter in high temperature or
high humidity environment.

2.

DESCRIPTION

2.1

Instrument Familiarization

a

Range Control Button

Q

Data Hold Button

@

ACIDC Current or

'I))/*

Selecting Button

@

Socket for Transistor Test

@

Function SwitcWPower Switch

@

V/n/F/Cx

lnput Jack

COM lnput Jack

@

m~/* lnput Jack

@

10A

lnput Jack

2.2

LCD

Display

See Table

1

indicated for information about the LCD display.

Indicator for ac voltage or current.
AC voltage and current are displayed as the
average of the absolute value of the input.
calibrated to indicate the equivalent

rms value

of a sine wave.

---

Indicator for dc voltage or current.

Table

1.

Display Symbols

Symbol

Meaning

The battery is low.

Warning: To avoid fake readings, which
wuld lead to possible electric shock or
personal injury, replace the battery as soon as
the

baffery indicator appears.

Indicates negative readings.

AUTO

The Meter is in the Autorange mode in which
the meter automatically selects the range with
the best resolution.