Velleman DVM890 Manuel utilisateur

DVM890

Multifunctional Digital Multimeter

Multifunctionele Digitale Multimeter

Multimètre digital multifonctions

USER MANUAL

GEBRUIKERSHANDLEIDING

MANUEL D’UTILISATION

DVM890 GB1

DVM890 -- Multifunctional Digital Multimeter

1.Introduction

Your DVM890 is a professional digital multimeter with a 3 ½ digit LCD display. It is ideally suited

for professional, academic and home applications. The device is equipped with the latest in IC

and display technology. Thanks to this technology, the DVM890 will provide you with precise

and reliable measurements for years to come.

The DVM890 measures DC and AC voltage, DC and AC current, resistance, continuity,

capacitance, frequency and temperatures. You can also diodes and transistors (hFE).

1.1.Warning

Be very careful when performing measurements as improper use of this device may result in

serious injuries or even death. Take all usual precautions for working with electrical circuits and

mind the safety prescriptions listed below. Do not use this device if you are unfamiliar with

electrical circuits and testing procedures.

This device is not intended for commercial or industrial use.

1.2.Safety Prescriptions

This multimeter was designed to ensure the safest operation possible. Nevertheless, safe

operation mainly depends on you, the user. Respect the following safety prescriptions :

• Never apply more than 1000VDC or 700Vrms AC between an input jack and ground.

• Use extreme caution when working with voltages in excess of 60VDC or 30Vrms AC.

• Always discharge the filter capacitors in a power supply circuit before attaching the test

leads.

• Never connect a voltage source to the DVM890 when it is in current (DCA or ACA) mode,

resistance or continuity mode.

• Always turn off the power and disconnect the test leads prior to replacing the battery or fuse.

• The user should only operate the multimeter when the back cover is in place and securely

fastened.

• When carrying out measurements on TVs or switching power circuits, you should always

remember that high voltage pulses may occur at the test points. These pulses may damage

the meter.

1.3.Maintenance

Your DVM890 is an example of superior design and craftsmanship. The following suggestions

will help you keep the device in perfect working order :

• Do not expose the device to water. Wipe it dry immediately if it should get wet.

• Use and store the multimeter under normal temperatures. Extreme temperatures may

shorten the life of the device or damage the battery.

• Handle the multimeter with care. Dropping it may damage the circuit boards or the housing

and may cause the DVM890 to malfunction.

• Replace an old or weak battery with a fresh one of the required size and type.

Remove the battery during long periods of inactivity. This will protect the multimeter from

possible leakage.

• Disconnect the test probes prior to opening the housing.

DVM890 GB2

• A blown fuse should be replaced with an identical one.

F : F 0.2A/250V

• Do not use this device in case of malfunction or if anomalies are detected. Have it repaired

by qualified personnel.

• Do not use the multimeter unless the back cover is in place and fully fastened.

• Use a soft cloth and a mild detergent for cleaning purposes. Never use abrasives or solvents

on the meter.

2.Description of the Front Panel

1) LCD display

2) Power ON/OFF button

3) Capacity input sockets

4) "20A MAX" jack

5) "mA" jack

6) "COM" jack

7) "VΩHz" jack

8) Temperature probe jack

9) RANGE and FUNCTION switch

10) Transistor test socket

2.1.Range and Function Selector

This rotary switch is used to install the various functions and each of the 32 ranges.

2.2.Power Switch

This push-button activates and deactivates the device. The DVM890 is also equipped with an

energy-saving feature : the meter is automatically deactivated when the RANGE and

FUNCTION selector has not been used for 15 minutes. The user will have to press the ON/OFF

button twice to switch the device on again when the energy-saving feature has deactivated the

DVM890.

2.3.Input Jacks

The DVM890 is equipped with 4 input jacks that are protected against overload. The limit

values are listed in the table below. The black test lead should be connected to the "COM" jack.

The red test lead should be connected to one of the other three input jacks, depending on the

required function.

DVM890 GB3

FUNCTION RED LEAD CONNECTION INPUT LIMITS

200mV VΩHz 250V DC or rms AC

V& V∼VΩHz 1000V DC, 700V AC (sine wave)

Hz VΩHz 250V DC or rms AC

ΩVΩHz 250V DC or rms AC

/ VΩHz 250V DC or rms AC

mA & mA∼mA 200mA DC or rms AC

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

20A for max. 15 seconds

3.Operating instructions

3.1. Measuring DC Voltage

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

jack.

2. Select the appropriate V range with the FUNCTION switch and connect the test leads to

the source or load to be tested.

3. The measured value and the polarity of the red test lead are displayed on the LCD.

Remark : Set the FUNCTION switch to the highest range and gradually work your way down if

the voltage range is unknown beforehand.

3.2. Measuring AC Voltage

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

jack.

2. Select the appropriate V∼range with the FUNCTION switch and connect the test leads to the

source or load to be tested.

3. The measured value appears on the LCD display.

Remark : Set the FUNCTION switch to the highest range and gradually work your way down if

the voltage range is unknown beforehand.

3.3. Measuring DC Current

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

for measurements of max. 200mA. Move the red test lead to the "10A" jack for

measurements of max. 20A (for max. 15 sec. at a stretch).

2. Select the A range with the FUNCTION switch.

3. Connect the test leads IN SERIES with the load under measurement.

4. The polarity of the red test lead and the measured current are displayed on the LCD.

Remark : Set the FUNCTION switch to the highest range and gradually work your way down if

the current range is unknown beforehand.

DVM890 GB4

3.4. Measuring AC Current

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

for measurements of max. 200mA. Move the red test lead to the "10A" jack for

measurements of max. 20A (for max. 15 sec. at a stretch).

2. Select the A ∼range with the FUNCTION switch.

3. Connect the test leads IN SERIES with the load under measurement.

4. The measured current is displayed on the LCD.

Remark : Set the FUNCTION switch to the highest range and gradually work your way down if

the current range is unknown beforehand.

3.5. Measuring Resistance

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

2. Select the appropriate "Ω" range with the FUNCTION switch and connect the test leads with

the load to be measured.

Remarks :

v The meter may need a few seconds to produce a stable reading for resistance

measurements in excess of 1MΩ.

v The overrange indication (“1.”) will appear on the display if the input is not connected or if

the resistance being measured exceeds the max. value of the selected range.

v Disconnect the circuit to be tested and make sure that all capacitors are fully discharged

before measuring the in-circuit resistance.

3.6. Measuring Capacitance

1. Connect the test capacitor to the "Cx" input connection (9 in figure on p. 2). Do NOT connect

the capacitor to one of the 4 input jacks (viz. "10A", "mA", "COM" or "VΩHz" jack).

2. Select the "Cx" range with the FUNCTION switch.

Remarks :

v Do not connect an external voltage to the input terminal. Discharge capacitors before

connecting them.

v Units : 1pF = 10-6µF 1nF = 10-3µF.

3.7. Testing Diodes & Continuity

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

2. Select the /range with the FUNCTION switch and connect the test leads.

3. Connect the red test lead to the anode and the black test lead to the cathode of the diode to

be tested.

4. For continuity tests : connect the test leads to two random points of the circuit to be tested.

The incorporated buzzer is activated if the resistance between the two test leads is lower

than ± 30Ω.

DVM890 GB5

3.8. Transistor Test (hFE)

1. Select the "hFE" range with the FUNCTION switch.

2. Determine whether the transistor is of the NPN- or PNP-type and locate the emitter, the base

and the collector. Insert the leads into the proper holes in the socket on the front panel.

3. The display will show the approximate hFE-value at the moment of testing. Base current

10µA, Vce 2.8V.

3.9. Measuring Temperature

1. Measure temperatures with the K-type thermocouple : select the "T" range with the

FUNCTION switch and insert the plug of the K-thermocouple in the green "K PROBE"

socket.

2. The ambient temperature will be displayed in °C if the "T" range is selected without

connecting the K-thermocouple.

Remark : Do not hesitate to push firmly in order to insert the temperature probe in the socket.

3.10.Measuring Frequency

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

jack.

2. Select the "KHz" range with the FUNCTION switch and connect the test leads to the source

or load to be tested.

Remarks :

v Do not apply more than 220Vrms to the input.

v Use shielded cable for measuring a weak signal in a noisy environment.

3.11.Automatic Power off

1. The device will be deactivated automatically when the FUNCTION and RANGE switch has

not been used for 15 minutes. This energy-saving feature extends the life of your battery.

2. The meter will be reactivated if the FUNCTION and RANGE switch is turned or if the power

switch is pressed again.

4.Specifications

Maximum accuracy is guaranteed for a one-year period after calibration. Ideal circumstances

require a temperature of 23°C (± 5°C) and a max. relative humidity of 75%.

4.1.General

Max. Voltage between Terminal and Earth 1000VDC or 700Vrms AC (sine wave)

Display 3 ½ digit LCD, 2 to 3 readings/sec.

Fuse Protection 200mA-range : F 0.2A/250V

20A-range : - - -

Power Supply 9V-battery

Ranging Method manual

Polarity Indication " - " is displayed

Overrange Indication " 1. " is displayed automatically

DVM890 GB6

Battery-Low Indication "" is displayed

Operating Temperature 0°C to 40°C

Storage Temperature -10°C to 50°C

Dimensions 88 x 170 x 38mm

Weight 340g (incl. battery)

4.2.DC Voltage

Range Resolution Accuracy

200mV 100µV

2V 1mV

20V 10mV

200V 100mV

±0.5% of rdg ±1 digit

1000V 1V ±0.8% of rdg ±2 digits

Input Impedance : 10MΩfor all ranges

Overload Protection : 1000V DC or peak AC for all ranges

4.3.AC Voltage

Range Resolution Accuracy

200mV 100µV ±1.2% of rdg ±3 digits

2V 1mV

20V 10mV

200V 100mV

±0.8% of rdg ±3 digits

700V 1V ±1.2% of rdg ±3 digits

Input Impedance : 10MΩfor all ranges

Frequency Range : 40 to 400Hz

Overload Protection : 750Vrms or 1000V peak continuous (except for the 200mVAC-range :

max. 15 sec. above 300Vrms).

4.4.DC Current

Range Resolution Accuracy

2mA 1µA

20mA 10µA ±0.8% of rdg ±1 digit

200mA 100µA ±1.2% of rdg ±1 digit

20A 10mA

±2.0% of rdg ±5 digits

Overload Protection : F 0.2A fuse (20A-range is not protected by a fuse)

Max. Input Current : 20A, 15 sec.

DVM890 GB7

4.5.AC Current

Range Resolution Accuracy

20mA 10µA ±1.2% of rdg ±3 digits

200mA 100µA ±2.0% of rdg ±3 digits

20A 10mA

±3.0% of rdg ±7 digits

Overload Protection : F 0.2A fuse (20A-range is not protected by a fuse)

Frequency Range : 40 to 400Hz

Max. Input Current : 20A, 15 sec.

4.6.Resistance

Range Resolution Accuracy

200Ω0.1Ω±0.8% of rdg ±3 digits

2kΩ1Ω

20kΩ10Ω

200kΩ100Ω

2MΩ1kΩ

±0.8% of rdg ±1 digit

20MΩ10kΩ±1% of rdg ±2 digits

200MΩ100kΩ±5% of rdg ±10 digits

4.7.Capacitance

Range Resolution Accuracy

2000pF 1pF

20nF 10pF

200nF 100pF

2µF 1nF

20µF 10nF

±2.5% of rdg ±5 digits

4.8.Temperature

Range Temperature Range Resolution Accuracy

- 50°C to 400°C ±0.75% of rdg ±3°C

400°C to 1000°C ±1.5% of rdg ±15°C

 0°C to 40°C

1°C ±2°C

Using a K-type thermocouple probe  Using the built-in temperature sensor

4.9.Frequency

Range Resolution Accuracy

20kHz 10Hz ±1% of rdg ±1 digit

Overload Protection : AC 220Vrms

DVM890 GB8

5.Accessories

• set of test leads

• K-type thermocouple (400°C)

• 1 battery of 9V

• 1 user manual

• 1 holster

• 1 adapter for capacitance measurements

5.1.How to use the holster

The holster protects the device and ensures comfortable operation. Consult the figures below :

1. Use one of the two supports to place the device on a table or a desk (fig. A & B).

2. Hang the meter on the wall using the smaller of the two supports. (fig. C) : remove the

smaller support and insert it in the slots at the top of the holster. Use the support to hang the

device on a nail in the wall.

3. Each of the two supports in fig. D can hold a test lead.

6.Replacing the Battery and the Fuse

The " " symbol appears when the battery needs to be replaced. Proceed as follows :

1. Disconnect the test leads from all live sources, switch off the device and remove the test

leads from the input terminals BEFORE opening the housing. This is necessary in order to

avoid the risk of electroshocks.

2. Remove the screws in the back cover and retrieve the battery.

3. Insert a new 9V-battery (NEDA1604 or IEC6F22).

4. Replace the cover and tighten the screws.

The fuse rarely needs to be replaced and a blown fuse is nearly always due to an error on

behalf of the operator. Open the housing (see above) and replace the blown fuse with an

identical one : F : F 0.2A/250V.

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