Velleman DVM645BI User manual

DVM645BI

BENCH MULTIMETER

TAFELMULTIMETER

MULTIMETRE DE TABLE

BANCO MULTÍMETRO

TISCHMULTIMETER

User Manual

Gebruikershandleiding

Manuel d'utilisation

Gebrauchsanleitung

DVM645BI GB1

DVM645BI – BENCH MULTIMETER

Introduction

This manual contains instructions and warnings that must be observed to ensure

safe operation and to keep the meter in a safe condition.

WARNING

READ "SAFETY INFORMATION"

BEFORE USING THE BENCH MULTIMETER

This multimeter is a portable 4000-count instrument that is designed for use in the

laboratory, the field, at home, and in other environments. This multimeter features

a compact design with rounded corners for easy handling, with a rugged shock-

resistant and fire-retardant case. It also has electronic overload protection for all

functions and ranges.

Unpacking and Inspection

Upon removing your new Bench Multimeter from its packaging, you should have

the following items:

1. Bench multimeter

2. Test lead set (one black, one red)

3. Carrying strap

4. Power lead

5. Instruction manual

If any of the above items are missing or are received in a damaged condition,

please contact the distributor from whom you purchased the unit.

Safety Precautions

Injury or death can occur even with low voltage and low current. It is extremely

important that you read this safety information before using your multimeter.

Follow all safety practices and proper operating procedures for the equipment

under test.

1. Exercise extreme caution when: measuring voltages above 20 volts,

measuring currents greater than 10mA, measuring AC power lines with

inductive loads, measuring AC power lines during electrical storms.

2. Always inspect your multimeter, test leads and accessories for signs of

damage or abnormality before every use. If there are any abnormalities

DVM645BI GB2

(i.e. broken or damaged test leads, cracked case, display not reading,

etc.) do not attempt to do any measurements.

3. Never earth yourself when making electrical measurements. Do not touch

exposed metal pipes, outlets, fixtures, etc., which might be at earth

potential. Keep your body insulated from earth by using dry clothing,

rubber shoes, rubber mats, or any approved insulating material.

4. Never touch exposed wiring, connections, test probe tips, or any live

circuit conductors when making measurements.

5. Never replace the protective fuse inside the multimeter with a fuse other

than the specified or approved type. Replace only with the same type of

fuse. To avoid electric shock, disconnect the test leads and any input

signals before replacing the fuse.

6. Replace only with the same type of battery. To avoid electric shock,

disconnect the power lead from the mains, and the test leads and any

input signal before replacing the battery.

7. Do not operate this multimeter in an explosive atmosphere (ie. in the

presence of inflammable gases or fumes, vapour or dust).

8. Measuring voltages that exceed the limits of the multimeter may damage

the meter and expose the operator to a shock hazard. Always respect the

meter voltage limits as stated on the front of the meter.

9. Never apply more than 500V DC between the COM connector and earth.

10. When testing for the presence of voltage or current, make sure the

voltage or current ranges are functioning correctly. Take a reading of a

known voltage or current before assuming a zero reading indicates no

current or voltage.

11. Do not attempt to calibrate or service the meter unless you are trained to

do so and another person capable of rendering first aid and resuscitation

is present.

12. Remember: Think Safety, Act Safely

Safety Information

The multimeter complies with Protection Class II, Overvoltage CAT II of IEC1010-

1 (EN61010-1). Pollution degree 2 in accordance with IEC-664 indoor use. If the

equipment is used in a non-compliant manner, the protection provided by the

equipment may be insufficient.

This product complies with the requirements of the following European

Community Directives: 89/336/EEC (EMC) and 73/23/EEC (LVD) as amended by

93/68/EEC (CE marking).

DVM645BI GB3

Chapter 1

A quick tour

Explanation of Symbols

Attention ! Refer to the operating instructions

Dangerous voltage may be present at terminals

Ground (Earth Terminal)

AC - Alternating Current

DC - Direct Current

Audible Continuity

Equipment protected throughout by Double Insulation

(Protection Class II)

DVM645BI GB4

Instrument Layout

Figure 1-1. Bench Multimeter (Front)

Figure 1-2. Bench Multimeter (Back)

DVM645BI GB5

1. VΩ

ΩΩ

ΩHz Volts, Ohms, Diode, and Frequency Input Terminal

This is the positive input terminal for all functions except current measurement.

The red test lead is connected to this.

2. COM Common Terminal

This is the negative (ground) input terminal for all measurement modes. The

black test lead is connected to this.

3. mA Milliamp Input Terminal

This is the positive input terminal for current measurements (AC or DC) up to

400mA. The red test lead is connected to this.

4. A 10 Amp Input Terminal

This is the positive input terminal for current measurements (AC or DC) up to

10A. The red test lead is connected to this.

5. Function / Range Selector Rotary Switch

This rotary switch selects the function, and selects the desired range.

6. Function / Range Selector Buttons

This button selects the function, and selects the desired range.

7. The LCD Display

The LCD display indicates the measured value of a signal, the function mode,

and indicators.

8. The Battery Cover

9. Power Supply Input with Fuse

WARNING

To avoid user injury and multimeter damage, the multimeter must be set to

the same AC voltage value as the mains before connecting the power lead

to the mains and switching on.

This switch is used to turn the AC Power on and off. When the AC Power is on,

the DC Power is automatically switched off.

10. The Power Switch

DVM645BI GB6

Using the Rotary Switch

Turn the multimeter on by turning the rotary switch to any function.

Using the Buttons

The buttons are push type switches. The functions are as follows:

1. BACK LIGHT Button

You can turn the back light on or off by pressing the button. When powered

by the battery, the back light will automatically switch off again after a short period

of time.

2. FUNCTION SELECTOR Button

In the resistance and continuity range, each press of the button switches

alternately between resistance and continuity.

In the frequency and adaptive test range, each press of the button switches

alternately between frequency and adaptive test.

In the DC and AC amps range, each press of the button switches alternately

between DC amps or AC amps.

In the DC and AC milliamps range, each press of the button switches

alternately between DC milliamps or AC milliamps.

3. Data Hold: HOLD Button

Press the button to toggle in and out of the Data Hold mode, except if the

multimeter is already in the Min/Max Recording Hold mode.

When in the Data Hold mode, the " " indicator is displayed and the last reading is

held on the display, the beeper emits a tone.

Pressing the button when the multimeter is in the Data Hold mode will cause

it to exit Data Hold and enter the Min/Max Recording Hold mode.

In the Min/Max Recording Hold mode, press the button to stop recording the

readings, press again to resume recording.

However, the multimeter is still operating in Data Hold mode, therefore, the buzzer

will still sound if the over range or continuity mode occurs. And the range will also

change if it is in auto range.

4. Delay Data Hold: DELAY HOLD Button

Press the button to toggle in and out of the Data Hold mode, and the " "

indicator turns on or off.

DVM645BI GB7

5. Min/Max Recording Hold: MIN/MAX Button

Press the button to enter the Min/Max Recording Hold mode. The minimum

and maximum values are then reset to the current input, the readings are stored in

memory, and the " " indicator turns on. Push the button to cycle through the

minimum (MIN), maximum (MAX), and current readings. The "MIN" or "MAX"

indicator turns on to indicate what value is being displayed.

In the Min/Max Recording Hold mode, press the button to stop recording the

readings, press again to restart recording. If recording is stopped, the minimum,

maximum, or current values and the analogue display are frozen. In the Min/Max

Recording Hold mode, if a new minimum value exceeds the actual minimum

readings, or a new maximum value is an overload value, the minimum or

maximum value will be held on the display, but the analogue display will continue

to be active.

If in auto range, the mode is held just before the range.

6. Relative Display: REL Button

Press the button to enter the Relative Display mode, the "REL" indicator turns

on, the displayed reading is stored as a reference value, and the display is then

set to zero.

In the Relative Display mode, the value shown on the LCD is always the

difference between the stored reference value and the current reading. If the new

reading is the same as the reference value, the display will indicate zero.

The bar graph displays absolute value, not relative value. And the over range also

occurs according to the absolute value.

With auto-range, the range is held just before range.

Press and hold down the button for more than one second to exit the relative

mode.

7. RANGE Button

Press the button to select the Manual Range mode and turn off the "AUTO"

indicator.

In the Manual Range mode, each time the button is pressed, the range (and

the input range indicator) increments and a new value is displayed.

To exit the Manual Range mode and return to auto range, press and hold down

the button for more than one second. The "AUTO" indicator turns back on.

The DC V, AC V, resistance and capacitance measurements are always first set

to the auto range by default.

The frequency measurement is always set to the auto range.

The continuity, diode, ADP, DC A and AC A measurements are always set to the

manual range.

When the power is turned on, the default range is selected.

DVM645BI GB8

8. Data Memory: MEM STO Button

Press the button to enter the Data Memory mode and turn on the "MEM"

indicator. All the display data is then stored in the memory. The stored data can

be read out and displayed on the LCD, which then switches to the Data Recall

Hold mode.

9. Data Recall Hold: MEM RCL Button

Press the button to enter the Data Recall mode and turn on the "MEM" and

"" indicator. The stored data can be read out and displayed on the LCD, which

then switches to the Data Recall Hold mode.

While storing data in the memory display, the "MEM" indicator flashes. The Data

Recall Hold mode is exited by pressing the button or the button.

Buzzer Output

A 2kHz buzzer sounds in the following cases:

1. When the key is operated.

2. When the over-range occurs, except for resistance (Ω

ΩΩ

Ω), frequency (Hz),

continuity ( ) and diode ( ) measurements.

3. When the continuity measurement results in less than 40Ω.

4. When the relative mode is exited.

5. When the mode is changed from manual to auto range by operating the

button. Please refer to the timing chart for the timing.

Low Battery Indication

The " " indicator is displayed when the battery voltage falls below the reliable

operating level.

DVM645BI GB9

Chapter 2

Measurements

Introduction

WARNING

To avoid user injury and multimeter damage, the

multimeter must be set to the correct value of mains

voltage before connecting the power lead to the mains and

switching on.

Before doing any measurements always examine the multimeter and accessories

for any damage, contamination (excessive dirt, grease, etc.) and defects. Examine

the test leads for cracked or frayed insulation and make sure the lead plugs fit

snugly into the multimeter sockets. If there are any abnormalities, do not attempt

to do any measurements.

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