Velleman DVM92 Manuel utilisateur

DVM92

Multifunctional Digital Multimeter

Multifunctionele Digitale Multimeter

Multimètre digital multifonctions

USER MANUAL

GEBRUIKERSHANDLEIDING

MANUEL D’UTILISATION

DVM92 GB1

DVM92 -- Multifunctional Digital Multimeter with 3 ½ Digit LCD

1.Introduction

Your DVM92 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 DVM92 will provide you with precise and

reliable measurements for years to come.

The DVM92 measures DC and AC voltage, DC and AC current, resistance and continuity. The

user can also test 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 750Vrms 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 the power supply circuit under test before attaching

the test leads.

• Never connect a voltage source to the DVM92 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 DVM92 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 DVM92 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.

DVM92 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.Front Panel Description

1) LCD display

2) RANGE and FUNCTION switch

3) Transistor test socket

4) "mA" jack

5) "COM" jack

6) "10A" jack

7) "V/Ω" jack

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 "V/Ω" 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 "V/Ω" 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.



DVM92 GB3

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.

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 value 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 "V/Ω" jack.

2. Select the V/Ω-range with the FUNCTION switch and connect the test leads with the load

under measurement.

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.Testing Diodes and Continuity

1. Connect the black test lead (-) to the "COM" jack and the red test lead (+) to the "V/Ω" 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 ± 50Ω.

DVM92 GB4

3.7.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.

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 750Vrms 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

Battery-Low Indication "" is displayed

Operating Temperature 0°C to 40°C

Storage Temperature -10°C to 50°C

Dimensions 85 x 165 x 32mm

Weight 250g (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 : 250Vrms for the 200mV-range and 1000V DC or peak AC for all other

ranges

DVM92 GB5

4.3.AC Voltage

Range Resolution Accuracy

2V 1mV

20V 10mV

200V 100mV

±0.8% of rdg ±3 digits

750V 1V

±1.2% of rdg ±3 digits

Input Impedance : 10MΩfor all ranges

Frequency Range : 40 to 400Hz

Overload Protection : 750Vrms or 1000V of continuous peak tension for all ranges

4.4.DC Current

Range Resolution Accuracy

200µA 0.1µA

2mA 1µA

20mA 10µA

±0.8% of rdg ±1 digit

200mA 100µA

±1.2% of rdg ±1 digit

20A 10µA

±2% of rdg ±5 digits

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

Max. Input Current : 20A, 15 sec.

4.5.AC Current

Range Resolution Accuracy

2mA 1µA

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

Overload Protection : 250V DC / AC rms for all ranges

DVM92 GB6

5.Accessories

• set of test leads

• 1 battery of 9V

• 1 user manual

• 1 holster

5.1.How to use the holster

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

1. Use the 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 back cover. Use the support to hang

the device on a nail in the wall.

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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