Velleman DVM98 User manual

DVM98

True RMS Digital Multimeter

1 Safety information

This multimeter has been designed according to IEC - 1010 concerning

electronic measuring instruments with an overvoltage category (CAT II) and

pollution 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

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

concerning :

- Protection against the dangers of electrical current.

- Protection of the meter against misuse.

•Full compliance with safety standards can be guaranteed only if used with

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

or same electric ratings. Measuring leads must be in good condition.

1.2 During use

•Never exceed the protection limit values indicated in specifications for each

range of measurement.

•When the meter is linked to a measurement circuit, do not touch unused

terminals.

•When the value scale to be measured is unknown beforehand, set the range

selector at the highest position.

•Before rotating the range selector to change functions, disconnect test leads

from the circuit under test.

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

remember that there may be high amplitude voltage pulses at test points

which can damage the meter.

•Never perform resistance measurements on live circuits.

1.3 Symbols

Important safety information, refer to the operating manual.

Dangerous voltage may be present.

Earth ground

Double insulation (Protection class II).

1.4 Maintenance

•Before opening the meter, always disconnect test leads from all sources of

electric current.

•For continue protection against fire, replace fuse only with the specified

voltage and current ratings :

F : F 200mA/250V

•If any faults or abnormalities are observed, the meter can not be used any

more and it has to be checked out.

•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 on it.

2. Description

This meter is a 4 ½ TRUE RMS professional measuring instrument, capable of

performing following functions :

- DC and AC voltage measurement

- DC and AC current measurement

- Resistance measurement

- Capacitance measurement

- Frequency measurement

- Diode and Transistor test

- Audible continuity test

1. POWER SWITCH

2. DATA-HOLD SWITCH

3. CAPACITOR MEASURING SOCKET

4. LCD DISPLAY

5. TRANSISTOR TESTING SOCKET

6. ROTARY SWITCH

7. INPUT JACKS

2.1 Function and Range Selector

There are totally 10 functions and 32 ranges provided. A rotary switch is used to

select functions as well as ranges.

2.2 Power Switch

A push - push switch is used to turn the meter on or off. To extend the battery

life, Auto Power-Off function is provided. The meter will be turned off

automatically within around 40 minutes. To turn on the meter again, push the

power switch to release it and then push it once more.

2.3 Data-Hold Switch

When this switch is active, the meter will hold the last display reading until

pushing the switch to release it.

2.4 Input Jacks

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

shown.

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

depending on the function selected.

FUNCTION RED LEAD

CONNECTION

INPUT LIMITS

200mV V ΩHz 250V DC or rms AC

V & V V ΩHz 1000V DC, 700V AC (sine)

Hz V ΩHz 250V DC or rms AC

ΩV ΩHz 250V DC or rms AC

V ΩHz 250V DC or rms AC

mA & mA mA 200mA DC or rms AC

20A & 20A A 10A DC or rms AC continuous

20A for 15 seconds maximum

3. Operating Instruction

3.1 Measuring voltage

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

Hz jack.

2. Set the rotary switch at the desired V or V range position and connect

test leads across the source or load under measurement. The polarity of the

red lead connection will be indicated along with the voltage value when

making DC voltage measurement.

3. When only the figure "1" is displayed, it indicates over range situation and

the higher range has to be selected.

3.2 Measuring current

1. Connect the black test lead to the COM jack and the red test lead to the mA

jack for a maximum of 200mA current. For a maximum of 20A, move the

red lead to the A jack.

2. Set the rotary switch at desired A or A range position and connect test

leads in series with the load under measurement. The polarity of the red lead

connection will be indicated along with the current value when making DC

current measurement.

3. When only the figure "1" displayed, it indicates over range situation and the

higher range has to be selected.

3.3 Measuring frequency

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

Hz jack.

2. Set the rotary switch at 20kHz position and connect test leads across the

source or load under measurement.

NOTE :

1. Reading is possible at input voltages above 10Vrms, but the accuracy is

not guaranteed.

2. In noisy environment, it is preferable to use shields cable for measuring

small signal.

3.4 Measuring resistance

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

Hz jack. ( The polarity of red lead is "+").

2. Set the rotary switch at desired Ωposition and connect test leads across the

resistor under measurement.

NOTE :

1. If the resistance being measured exceeds the maximum value of the

range selected or the input is not connected, an over range indication "1"

will be displayed.

2. When checking in - circuit resistance, be sure the circuit under test has

all power removed and that all capacitors have been discharged fully.

3. For measuring resistance above 1MΩ, the meter may take a few seconds

to get stable reading. This is normal for high resistance measurements.

4. At 200MΩrange display reading is around 1000 counts when test leads

are shorted. These counts have to be subtracted from measuring results.

For example, when measuring 100MΩresistance the display reading will

be 110.00 and the correct measuring result should be 110.00 - 10.00 =

100.00MΩ.

3.5 Measuring capacitance

1. Set the rotary switch at desired F position.

2. Before inserting capacitor under measurement into capacitance testing

socket, be sure that the capacitor has been discharged fully.

3. When measuring capacitors with shorter leads, a testing adapter is provided

with the meter. Insert the adapter into the capacitance testing socket on the

front panel to continue measurements.

WARNING

To avoid electric shock, be sure the capacitor measuring adapter has been

removed before changing to another function measurement.

3.6 Testing diode

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

Hz jack. (The polarity of red lead is "+")

2. Set the rotary switch at position and connected lead to the anode, black

lead to the cathode of the diode under testing. The meter will show the

approx. forward voltage of the diode. If the lead connection is reversed,

only figure "1" displayed.

3.7 Testing transistor

1. Set the rotary switch at hFE position.

2. Determine whether the transistor to be tested is NPN or PNP type and locate

the Emitter, Base and Collector leads. Insert leads of the transistor into

proper holes of the transistor testing socket.

3. The meter will show the approx. hFE value at test condition of base current

10µA and Vce 3.2V.

3.8 Continuity test

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

Hz jack. (The polarity of the red lead is positive "+").

2. Set the rotary switch at position and connect test leads across two points

of the circuit under testing. If continuity exists (i.e. , resistance less than

about 50Ω), built - in buzzer will sound.

4. 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 80%.

Accuracy specifications are given as :

+ % of reading + number of least significant digits.

4.1 General

MAXIMUM VOLTAGE BETWEEN

TERMINALS AND EARTH GROUND 1000 V DC or 700 V rms AC (sine)

FUSE PROTECTION mA:F 200mA/250V (A : unfused)

POWER SUPPLY 9V battery

DISPLAY LCD, 19999 counts, updates 2-3/sec

MEASURING METHOD Dual-slope integration A/D converter

OVERRANGE INDICATION "1" figure only on the display

POLARITY INDICATION "-" displayed for negative polarity

OPERATING TEMPERATURE 0°C to 40°C (32°F to 104°F)

STORAGE TEMPERATURE -10°C to 50°C (14°F to 122°F)

LOW BATTERY INDICATION " " appears on the display

SIZE (H x W x L) 31.5mm x 91mm x 189mm

WEIGHT 310g (including battery)

4.2 DC voltage

Range Resolution Accuracy

200mV 0.01mV + 0.05% of rdg + 3 digits

2V 0.1mV + 0.1% of rdg + 3 digits

20V 1mV + 0.1% of rdg + 3 digits

200V 10mV + 0.1% of rdg + 3 digits

1000V 0.1V + 0.15% of rdg + 5 digits

Input Impedance : 10MΩ

4.3 AC Voltage

Range Resolution Accuracy

50Hz - 60Hz 40Hz - 1000Hz

2V 0.1mV + 0.5 % of rdg + 10 digits + 1.0% of rdg + 10 digits

20V 1mV + 0.6 % of rdg + 10 digits + 1.0% of rdg + 10 digits

200V 10mV + 0.6 % of rdg + 10 digits + 1.0% of rdg + 10 digits

700V 0.1V + 0.8 % of rdg + 15 digits + 1.2% of rdg + 15 digits

Input impedance : 2MΩ

Frequency Range : 40Hz to 1000Hz

Response : TRUE RMS. RMS conversion with Signal Crest Factors Up to 5.

4.4 DC Current

Range Resolution Accuracy Burden Voltage

2mA 0.1µA + 0.5% of rdg + 5 digits 110mV/mA

20mA 1µA + 0.5% of rdg + 5 digits 15mV/mA

200mA 10µA + 0.8% of rdg + 5 digits 5.0mV/mA

10A 1mA + 2.0% of rdg + 10 digits

0.03V/A

4.5 AC Current

Range Resolution Accuracy Burden Voltage

2mA 0.1µA + 0.8% of rdg + 10 digits

110mV/mA

20mA 1µA + 0.8% of rdg + 10 digits

15mV/mA

200mA 10µA + 1.2% of rdg + 10 digits

5.0mV/mA

10A 1mA + 2.5% of rdg + 10 digits

0.03V/A

Frequency Range : 40 Hz to 1000 Hz

Response : TRUE RMS. RMS Conversion with Signal Crest Factors Up to 5.

4.6 Resistance

Range Resolution Accuracy

200Ω0.01Ω+ 0.5% of rdg + 10 digits

2kΩ0.1Ω+ 0.3% of rdg + 10 digits

20kΩ1Ω+ 0.3% of rdg + 10 digits

200kΩ10Ω+ 0.3% of rdg + 10 digits

2MΩ100Ω+ 0.3% of rdg + 10 digits

20MΩ1kΩ+ 0.5% of rdg + 10 digits

200MΩ10kΩ+ 5.0% of (rdg - 1000 digits) + 10 digits

Note : On 200MΩrange, if short input, display will read 10MΩ, this 10MΩ

should be subtracted from measurement results.

4.7 Frequency

Range Resolution Accuracy

20kHz 1Hz + 1.5% of rdg + 5 digits

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

4.8 Capacitance

Range Resolution Accuracy

2000pF 0.1pF

20nF 1pF

200nF 10pF + 4.0% of rdg + 20 digits

2µF 0.1nF

20µF 1nF

5 Accessories

Test leads

Battery

Operating Manual

Holster

Capacitance Testing Adapter

5.1 How to use the holster

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

comfortable.

It comes with two stands installed together. The figure 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. Take the little stand off from

the back side of the large stand and insert it into holes located upper on the

holster. (fig. c)

4. Hold test leads. (fig. d)

Fig. a Fig. b

Fig. d

Fig. c

Table of contents

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