Velleman DVM990BL User manual

DVM990BL

DIGITAL MULTIMETER MULTIMETRE DIGITAL

OPERATING MANUAL MANUEL D’UTILISATION

DIGITALE MULTIMETER DIGITALES MULTIMETER

BEDIENINGSHANDLEIDING BEDIENUNGSANLEITUNG

MULTÍMETRO DÍGITAL

MANUAL DEL USUARIO

DVM990BL VELLEMAN1

1. SAFETY INFORMATION

WARNING

To ensure safe operation, and in order to exploit to the full functionality of the

meter, please follow the directions in this section carefully.

This multimeter has been designed according to IEC-1010 for electronic

measuring instruments, with an overvoltage category CAT II and pollution

category 2.

Follow all safety and operating instructions to ensure that the meter is used

safely and is kept in good operating condition.

1.1. PRELIMINARY

1.1.1. When using the meter, the user must observe all normal safety rules

concerning:

• protection against the dangers of electric current

• protection of the meter against misuse

1.1.2. When the meter is delivered, check that it has not been damaged in

transit.

1.1.3. If in a poor condition due to harsh storage or shipping conditions,

immediately inspect the meter and confirm its condition.

1.1.4. Test leads must be in good condition. Before using check that the test

lead insulation is not damaged and/or the lead wire is not exposed.

1.1.5. Full compliance with safety standards can only be guaranteed if used

with the test leads supplied. If necessary, they must be replaced with

leads of the same type with the same electric ratings.

1.2. DURING USE

1.2.1. Never exceed the protection limit values indicated in the specifications

for each measurement range.

1.2.2. When the meter is connected to a circuit under measurement, do not

touch unused terminals.

1.2.3. If the value to be measured is unknown beforehand, set the range

selector to the highest position.

1.2.4. Do not measure voltage if the voltage on the terminals exceeds 1000V

above earth.

1.2.5. Always be careful when working with voltages above 60V DC or 30V

AC rms, keep your fingers behind the probe barriers while measuring.

DVM990BL VELLEMAN2

1.2.6. Before rotating the range selector to change functions, disconnect the

test leads from the circuit under test.

1.2.7. Never connect the meter leads across a voltage source while the

function switch is in the current, resistance, diode or continuity mode.

Doing so can damage the meter. When doing measurements on TV or

power switching circuits always remember that there may be high

amplitude voltage pulses at test points which can damage the meter.

1.2.9. Never perform resistance measurements on live circuits.

1.2.10.Never perform capacitance measurements unless the capacitor to be

measured has been fully discharged.

1.2.11.If any faults or abnormalities are observed, the meter should not be

used and it needs to be inspected.

1.2.12.Never use the meter unless the back of the casing is in place and

fastened securely.

1.2.13.Do not store or use the meter in areas exposed to direct sunlight, high

temperature, humidity or condensation.

1.3. SYMBOLS

Important safety information, refer to the operating manual.

Dangerous voltage may be present.

Double insulation (Protection Class II)

Earth

1.4. MAINTENANCE

1.4.1. Do not attempt to adjust or repair the meter by removing the back of

the casing while voltage is applied. Only a technician who fully

understands the danger involved should carry out such operations.

1.4.2. Before opening the meter battery cover, always disconnect the test

leads from all sources of electric current.

1.4.3. For continued protection, only replace the fuse with the specified

voltage and current ratings:

F1: F 200mA/250V (quick acting)

F2: F 10A/250V (quick acting)

1.4.4. Do not use abrasives or solvents on the meter, use a damp cloth and

mild detergent only.

1.4.5. Always set the power switch to the OFF position when the meter is not

in use.

1.4.6. If the meter is to be stored for a long period of time, the batteries

should be removed to prevent damage to the unit.

DVM990BL VELLEMAN3

2. DESCRIPTION

2.1. NAMES OF COMPONENTS

(1) LCD display

(2) Power switch (POWER)

(3) Black light switch ( )

(4) Data hold switch (H)

(5) Rotary switch

(6) Input socket

(7) Case

(8) Battery door

(9) Brace

(10) Screw

DVM990BL VELLEMAN4

2.2. FUNCTION AND RANGE SELECTOR

- This meter is a portable professional measuring instrument with a large

LCD and back light for easy reading.

- This meter has built-in protection to prevent the test leads being

connected incorrectly. The input socket for the red test lead senses the

correct functions and ranges. When the rotary switch cannot be turned,

do not force it as it means that the selected range isn’t suitable for what

the red lead is connected to. Pull out the red lead and then select the

required range. This provides protection for the meter in order to avoid

damage through incorrect operation.

- This meter has a data hold function.

- A rotary switch is used to select the functions and the ranges.

3. SPECIFICATIONS

Accuracy is specified for a period of one year after calibration and at

18°C to 28°C (64°F to 82°F) with relative humidity to 75%.

3.1. GENERAL SPECIFICATIONS

• 30 ranges of functions.

• Over range protection for all ranges.

• Operating altitude: 2000m max.

• Max. voltage between terminals and earth: 1000V DC or AC (peak

value)

• Fuse protection: F1 200mA/250V F2 10A/250V

• Display: 28mm LCD, word is 28mm high

• Max display value: 1999 (3 1/2)

• Polarity indication: "-" indicates negative polarity

• Over range indication: displays "1" or "-1"

• Sampling time: approx. 0.4 seconds

• Power supply: 9V battery, 6F22 or NEDA 1604

• Low battery indication: " " displayed

• Temperature factor: < 0.1 x accuracy / °C

• Operating temperature: 0°C to 40°C (32°F to 104°F)

• Storage temperature: -10°C to 50°C (10°F to 122°F)

• Dimensions: 191 x 82 x 36mm (without holster)

• Weight: approx. 280g (including battery)

DVM990BL VELLEMAN5

3.2. ELECTRICAL SPECIFICATIONS

Ambient temperature: 23 ± 5°C

Relative humidity: < 70%

3.2.1. DC Voltage

Range Resolution Accuracy (% reading + digits)

200mV 0.1mV ± (0.5% of rdg + 1 digit)

2V 1mV ± (0.5% of rdg + 3 digits)

20V 10mV ± (0.5% of rdg + 3 digits)

200V 100mV ± (0.5% of rdg + 3 digits)

1000V 1V ± (0.8% of rdg + 3 digits)

Input impedance: 10 Mohm

Overload protection: 200mV range: 250V DC or rms AC

2V-1000V ranges: 1000V DC or 700V rms AC

NOTE:

At low voltage range, the meter will show an unsteady reading when

the test leads are not connected to the circuit. This is normal because

the meter is very sensitive. When the test leads touch the circuit, you

get the true reading.

3.2.21. AC Voltage

Range Resolution Accuracy (% reading + digits)

200mV 0.1mV ± (1.2% of rdg + 5 digits)

2V 1mV ± (1.0% of rdg + 5 digits)

20V 10mV ± (1.0% of rdg + 5 digits)

200V 100mV ± (1.0% of rdg + 5 digits)

1000V 1V ± (1.2% of rdg + 5 digits)

Input impedance: 10 Mohm

Overload protection: 200mV range: 250V DC or rms AC

2V-1000V ranges: 1000V DC or 700V rms AC

Frequency range: 40 to 400Hz

Test on 60Hz/50Hz

Response: average, calibrated in rms of sine wave

NOTE:

At low voltage range, the meter will show an unsteady reading when

the test leads are not connected to the circuit. This is normal because

the meter is very sensitive. When the test leads touch the circuit, you

get the true reading.

DVM990BL VELLEMAN6

3.2.3. DC Current

Range Resolution Accuracy (% reading + digits)

2mA 1µA ± (1.0% of rdg + 3 digits)

20mA 10µA ± (1.0% of rdg + 3 digits)

200mA 100µA ± (1.5% of rdg + 5 digits)

10A 10mA ± (2.0% of rdg + 10 digits)

Overload protection: 2mA to 200mA ranges: F1: F 200mA/250V fuse

10A range: F2: F 10A / 250V fuse

Max. input current: mA socket: 200mA

10A socket: 10A (less than 15 seconds)

Voltage drop: 200mV

3.2.4. AC Current

Range Resolution Accuracy (% reading + digits)

2mA 1µA ± (1.2% of rdg + 5 digits)

20mA 100µA ± (2.0% of rdg + 5 digits)

10A 10mA ± (3.0% of rdg + 10 digits)

Overload protection: 2mA to 200mA ranges: F1: F 200mA/250V fuse

10A range: F2: F 10A / 250V fuse

Max. input current: mA socket: 200mA

10A socket: 10A (less than 15 seconds)

Voltage drop: 200mV (full range)

Frequency range: 40 to 400Hz

Test on 60Hz/50Hz

Response: average, calibrated in rms of sine wave

3.2.5. Resistance

Range Resolution Accuracy (% reading + digits)

200ohm 0.1ohm ± (1.0% of rdg + 10 digits)

2kohm 1ohm ± (1.0% of rdg + 1 digit)

20kohm 10ohm ± (1.0% of rdg + 1 digit)

200kohm 100ohm ± (1.0% of rdg + 1 digit)

2Mohm 1kohm ± (1.0% of rdg + 1 digit)

20Mohm 10kohm ± (1.0% of rdg + 5 digits)

200Mohm 100kohm ± (5.0% of (rdg - 10 digits) + 20

digits)

Open Circuit Voltage: 200 Mohm range: 3V

Other ranges: less than 700mV

Overload protection: 250V DC or rms AC

DVM990BL VELLEMAN7

NOTE:

With the 200 Mohm range, if the input is short circuited, the display will

read 1Mohm. This 1Mohm should be subtracted from the measured

results.

3.2.6. Capacitance

Range Resolution Accuracy (% reading + digits)

2nF 1pF ± (4.0% of rdg + 3 digits)

20nF 10pF ± (4.0% of rdg + 3 digits)

200nF 0.1nF ± (4.0% of rdg + 3 digits)

2µF 1nF ± (4.0% of rdg + 3 digits)

20µF 10nF ± (4.0% of rdg + 3 digits)

Overload Protection: 250V DC or rms AC

3.2.7. Diode

Range Resolution Function

1mV Display: reads approximate

forward voltage of diode

Overload Protection: 250V DC or rms AC

Forward DC current: approximate 1mA

Reverse DC voltage: approximate 2.8V

3.2.6. Continuity

Range Function

Built-in buzzer will sound, if resistance is less

than 70 ohms

Overload Protection: 250V DC or rms AC

Open circuit voltage: approximate 2.8V

3.2.9. Frequency

Range Resolution Accuracy (% reading + digits)

20kHz 10Hz ± (1.5% of rdg + 10 digits)

Overload Protection: 250V DC or rms AC

Sensitivity: 200mV rms and input no more 10V rms

DVM990BL VELLEMAN8

3.2.10. Temperature

Range Resolutio

n Accuracy (% reading + digits)

-20°C

1000°C

1°C -20°C to 0°C

0°C to 400°C

400°C to 1000°C

± (5.0% of rdg + 5 digits)

± (1.0% of rdg + 3 digits)

± (2.0% of rdg + 3 digits)

Overload Protection: 250V DC or rms AC

4. OPERATING INSTRUCTIONS

4.1. DATA HOLD

If you want data hold when measuring, press "H" and it will hold the

reading. Press the button again to remove data hold.

4.2. BACK LIGHT

In poor lighting conditions, press " " to put the back light on to make

reading easier.

NOTE:

1. An LED is the main back light source. Its operating current is large,

although the meter has a timer (the time is 5 seconds and it will switch

off automatically after 5 seconds). Frequent use of the back light will

shorten the battery life. It is better not to use the back light when not

necessary.

2. When the battery voltage is less than 7V, it will display " ".

However, when using the back light at the same time, " " may

appear even if the battery voltage is more than 7V, because the

operating current is higher and the voltage will fall. You do not need to

replace the battery if this happens. In normal use (back light off), " "

will not appear if the battery is good.

4.3. PREPARATION FOR MEASUREMENT

4.3.1. Switch on with the "POWER" switch. If the battery voltage is less than

7V, " " will appear and the battery should be replaced.

4.3.2. The " " next to the input socket means that the input voltage or

current should be less than that specified on the meter sticker in order

to protect the interior circuit from damage.

4.3.3. Select the appropriate range for the item to be measured with the

rotary switch.

DVM990BL VELLEMAN9

4.4. MEASURING VOLTAGE

4.4.1. Connect the black test lead to the COM socket and the red test lead to

the V/Ωsocket.

4.4.2. Set the rotary switch to the desired V or V range.

4.4.3. Connect the test leads across the source or load under test.

4.4.4. You can see the reading on the LCD. The polarity of the red lead will

be indicated along with the voltage value when making DC voltage

measurements.

NOTE:

1. When only the figure "1" or "-1" is displayed, it indicates an over range

situation and a higher range has to be selected.

2. When the value to be measured is unknown beforehand, set the range

selector to the highest position.

3. " " means you cannot have a voltage input that is higher than 1000V

DC or 7000V rms AC. It is possible to display a higher voltage, but it

may destroy the interior circuit.

4. Be careful to avoid electric shocks when measuring high voltages.

4.5. MEASURING CURRENT

4.5.1. Connect the black test lead to the COM socket and the red test lead to

the mA socket for a maximum of 200mA current. For a maximum of

10A, move the red lead to the 10A socket.

4.5.2. Set the rotary switch to the desired A or A range.

4.5.3. Connect the test leads in series with the load under test.

4.5.4. You can see the reading on the LCD. The polarity of the red lead will

be indicated along with the current value when making DC current

measurements.

NOTE:

1. When only the figure "1" or "-1" is displayed, it indicates an over range

situation and a higher range has to be selected.

2. When the value to be measured is unknown beforehand, set the range

selector to the highest position.

3. " " means you cannot input a voltage that is more than 200mA or

10A depending on the socket used. Excess current will blow the fuse.

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