Velleman DVM 68 Manuel utilisateur

DVM 68

LCD Auto Range Digital Multimeter

OPERATION MANUAL

GEBRUIKERSHANDLEIDING

MANUEL D’UTILISATEUR

VELLEMAN GB1

DVM 68

LCD Auto Range Digital Multimeter

1. Description

Your DVM 68 is a autoranging professional digital multimeter with a 3 ¾ digit LCD

display. It is ideally suited for field, lab, shop, and home applications. By using the

latest in IC and display technology to significantly reduce the number of discrete

internal components, the multimeter gives you superb measuring capability as well as

the highest possible reliability.

It is capable of performing functions :

DC Voltage AC Voltage Resistance

AC Current DC Current Capacity

Frequency Continuity

Also diodes and transistors (amplification hFE) can be tested.

1.1 Warning

Use extreme caution in the use of this device. Improper use of this device can result in

injury or death. Follow all safeguards suggested in this owner's manual in addition to

normal safety precautions in dealing with electrical circuits. Do not use this device if

you are unfamiliar with electrical circuits and testing procedures.

Not for commercial or industrial use.

1.2 A word about safety

This multimeter is designed to ensure the safest operation possible. However, safe

operation depends on you, the operator. Make sure you follow these simple safety

rules :

• Never apply a voltage to the multimeter that exceeds the limits given in the

specifications. Never apply more than 1000V DC or 750V rms AC between an

input jack and ground.

• Use extreme caution when working with voltages above 60V DC or 30V AC rms.

• Always discharge filter capacitors in the power supply circuit under test before you

attach test leads.

• Never connect to a source of voltage when you select DCA, ACA, resistance

measurement or continuity check function.

• Always turn off power and disconnect the test leads before you replace the batteries

or fuse.

• Never operate the multimeter unless the battery cover is in place and fully closed.

When carrying out measurements on TV or switching power circuits, always

remember that there may be high amplitude voltages pulses at test points which can

damage the meter.

VELLEMAN GB2

1.3 Maintenance

Your DVM 68 is an example of superior design and craftsmanship. The following

suggestions will help you care for themultimeter so you can enjoy it for years :

• Keep the multimeter dry. If it gets wet, wipe it dry immediately.

• Use and store the multimeter only in normal temperature environments.

Temperature extremes can shorten the life of electronic devices or damage

batteries.

• Handle the multimeter gently and carefully. Dropping it can damage the circuit

boards and case and can improper functioning.

• Use only fresh batteries of the required size and type. Always remove old or weak

batteries.

If you do not plan to use the multimeter for a month or more, remove the batteries.

This protects the multimeter from possible leakage.

• Disconnect the test probes before opening the multimeter.

• Replace blown fuses only with same size and type :

F1 : F 300mA/250V F2 : F 10A/250V

• If any faults or abnormalities are observed, do not use this device and let it check

by authorised personel.

• Never use the meter unless the back cover is in place and fastened fully.

• To clean the meter, use a damp cloth and mild detergent only, do not use abrasives

or solvents.

2. Description of the front panel

1. Display

2. Range Control Button

3. Data Hold button

4. AC/DC Current of

/ Selecting Button

5. Socket for Transistor Test

6. Function Switch/Power Switch

7. V/Ω/F Input Jack

8. COM Input Jack

9. mA/Cx Input Jack

10. 10A Input Jack



VELLEMAN GB3

2.1 Range Control Button

Range for AC/DC voltage, AC/DC current(µA and mA only), Resistance and

Frequency measuring can be selected manually or autorange. Push this button as

following to choose range the desired mode or range.

2.2 DATA HOLD button

When this button is pushed, the display will show the last reading and " D-H " symbol

will appear until the button is pushed again.

Data holding will be cancelled automatically when the function switch is rotated.

2.3 AC/DC Current or / Selecting button

Push this button to select AC or DC current measuring function when the function

switch is set at µA, mA, A positions.

Push this button to select or measuring when the function switch is set at /

position.

Power On or Function Changing

AutoRanging

Manual Ranging

Range Changed

Push button

for over

3 sec.

Push button once

"R-H"displayed

Push button for

less than 1 sec.

VELLEMAN GB4

2.4 Input Jacks

This meter has four input jacks that are protected against overload to the limits.

During use, connect the black test lead to the COM jack and the red test lead as shown

below

Function Red Lead Connection Input Limits

DCV / ACV V / Ω/ F 1000V DC or 750V AC rms

kHz V / Ω/ F 250V DC or AC rms

Ω/ / V / Ω/ F 250V DC or AC rms

µA / mA mA / Cx 300mA DC or AC rms

nF / µF mA / Cx 300mA fuse protected

A A 10A DC or AC rms

µA/ mA and A ranges are protected by fuses.

3. Operating instructions

3.1 Measuring Voltage

1) Connect the black test lead (-) to the COM jack and the red test lead (+) to the

V/Ω/F jack.

2) Set the function switch at V or V∼range to be used and connect test leads across

the source or load under measurement.

3) Read LCD display. The polarity of red connection will be indicated when making a

DC measurement.

3.2 Measuring Current

1) Connect the black test lead (-) to the COM jack and the red test lead (+) to the

mA/Cx jack for a maximum of 300mA. For a maximum of 10A, move the red lead to

the A jack.

2) Set the function switch at µA, mA or A range to be used and push / ∼button to

select DCA or ACA mode.

3) Connect test leads IN SERIES with the load in which the current is to be

measured.

4) Read LCD display. The polarity of red lead connection will be indicated when

making a DC measurement.

3.3 Measuring Resistance

1) Connect the black test lead (-) to the COM jack and the red test lead (+) to the

V/Ω/F jack.

2) Set the function switch at Ωrange to be used and connect test leads across the

resistance under measurement.

VELLEMAN GB5

Remarks :

1) For resistance above 3.26MΩ, it may take a few seconds to stabilize reading. This

is normal for high resistance measuring.

2) When the input is not connected, i.e. at open circuit, the figure "OL" will be

displayed for the overrange condition.

3) When checking in-circuit resistance, be sure the circuit under test has all power

removed and all capacitors are fully discharged.

3.4 Measuring Capacitance

1) Connect the black test lead (-) to the COM jack and the red test lead (+) to the

mA/Cx jack.

2) Set the function switch at nF or µF position to be used.

3) Connect test leads across the capacitor under measurement and be sure that the

polarity of connection is observed.

Remarks :

1) When checking in-circuit capacitance, be sure that the circuit has all power

removed and all capacitor are fully discharged.

2) The range control mode in capacitance measurement is manual ranging and only

two ranges (326nF, 32.6µF) are provided.

3) If Range Control Button is used in this measuring function, decimal points may be

at incorrect positions.

4) At the nF range, when the capacitor to be measured is not connected to test leads,

the LCD may not read zero, but a few counts. These count have to be substracted from

measuring results.

3.5 Measuring Frequency

1) Connect the black test lead (-) to the COM jack and the red test lead (+) to the

V/Ω/F jack.

2) Set the function switch at the Hz position and connect test leads across the source

or load under measurement.

Remark :

The input voltage should be between 200mV and 10V rms AC. If the voltage is more

than 10V rms, reading may be out of the accuracy range.

3.6 Continuity & Diode Test

1) Connect the black test lead to the COM jack and the red test lead to the V/Ω/F jack.

2) Set the function switch at / position and push the /button to select

continuity or diode test mode.

3) In continuity testing, if continuity exists (i.e. resistance less than about 50Ω), built-

in buzzer will sound.

4) If diode test mode is selected, connect the red and black to the anode and cathode

of the diode under test. The forward voltage drop of this diode in V will be displayed.

VELLEMAN GB6

3.7 Transistor Test

1) Set the function switch at hFE position.

2) Identify whether the transistor is NPN or PNP type and locate emitter, base and

collector lead. Insert leads of the transistor to be tested into proper holes of the testing

socket on the front panel.

3) LCD display will show the approximate hFE value at the test condition of base

current 10 µA and Vce 3.2V.

4. Specifications

Accuracy is specified for a period of one year after calibration and at 18°C to 28°C

with relative humidity to 80%.

4.1 General

Max. voltage between terminal and earth 1000V DC or 750V AC rms (sinus)

Display 3 ¾ digit LCD, 3260 counts max,

2-3 readings / sec

Fuse protection µA & mA range : F 300mA/250V

A range : F 10A/250V

Power Supply 9V battery

Ranging method Auto / Manual

Polarity indication " - " displayed

Overrange indication " OL " displayed automatically

Low Battery indication " " displayed

Operating temperature 0°C to 40°C

Storage temperature -10°C to 50°C

Dimensions 91 x 189 x 31.5 mm

Weight 310 g (incl. battery)

4.2 DC Voltage

Range Resolution Accuracy

326mV 0.1mV ±0.5% of rdg ±2 digits

3.26V 1mV

32.6V 10mV ±0.3% of rdg ±2 digits

326V 0.1V

1000V 1V ±0.5% of rdg ±2 digits

Input impedance : 10MΩ, more than 100MΩat 326mV range

VELLEMAN GB7

4.3 AC Voltage

Range Resolution Accuracy

3.26V 1mV

32.6V 10mV ±0.8% of rdg ±3 digits

326V 0.1V

750V 1V

Input impedance : 10MΩ

Frequency range : 40 to 1000Hz, 40 to 200Hz at 3.26V range

4.4 DC Current

Range Resolution Accuracy Burden Voltage

326µA 0.1µA 0.5mV / µA

3260µA 1µA ±1.2% of rdg ±3 digits 0.5mV / µA

32.6mA 10µA 8.0mV / mA

326mA 0.1mA 8.0mV / mA

10A 10mA ±2.0% of rdg ±5 digits 0.02V / A

Overload protection : F 300mA fuse for µA and mA ranges,

F 10A fuse for A range

4.5 AC Current

Range Resolution Accuracy Burden Voltage

326µA 0.1µA 0.5mV / µA

3260µA 1µA ±1.5% of rdg ±5 digits 0.5mV / µA

32.6mA 10µA 8.0mV / mA

326mA 0.1mA 8.0mV / mA

10A 10mA ±3.0% of rdg ±7 digits 0.02V / A

Overload protection : F 300mA fuse for µA and mA ranges,

F 10A fuse for A range

Frequency range : 40Hz to 1000Hz

4.6 Resistance

Range Resolution Accuracy

326Ω0.1Ω±0.8% of rdg ±3 digits

3.26kΩ1Ω

32.6kΩ10Ω±0.8% of rdg ±3 digits

326kΩ100Ω

3.26MΩ1kΩ

32.6MΩ10kΩ±1.2% of rdg ±2 digits

Maximum Open Circuit Voltage : 1.3V

4.7 Capacitance

VELLEMAN GB8

fig. a fig. b fig. c

fig. d

Range Resolution Accuracy

326nF 0.1nF ±3.0% of rdg ±5 digits

32.6µF 10nF

4.8 Frequency

Range Resolution Accuracy

32.6kHz 10Hz ±1.2% of rdg ±3 digits

150kHz 100Hz ±2.5% of rdg ±3 digits

Sensivity : 200mV rms up to 50kHz, 1V rms for 50kHz to 150kHz

5. Accessories

Test leads

Battery (9V)

Operation Manual

Holster

5.1 How to use the holster

The holster is used to protect the meter and to make the measurement more

confortable. The following figures shows how to use the holster to :

1) Support the meter with a standard angle. (fig. a)

2) Support the meter with a small angle using the little stand.(fig. b)

3) Hang the meter on the wall using the little stand. (fig. c)

Take the little stand off from the back side of the large stand and insert it into holes

located upper on the holster.

4) Hold test leads. (fig. d)

6. Battery and fuse replacement

VELLEMAN GB9

If the sign " " appears on the LCD display, it indicates that the battery should be

replaced. Remove screws on the back cover and open the case. Replace the exhausted

battery with a new one.

Fuse rarely needs replacement and blows usually as a result of the operator’s error.

Open the case as mentioned above and take the PCB assembly out from the case.

Replace the blown fuse with ratings specified.

F1 : F 300mA/250V F2 : F 10A/250V

Remark :

Before attempting to open the case, be sure that test leads have been disconnected

from measurement circuit to avoid electric shock.

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