Velleman DVM 890L Manual de usuario

DVM 890L

LCD Standard Digital Multimeter

LCD Standaard Digitale Multimeter

Multimètre Digital LCD Standard

USER MANUAL

GEBRUIKERSHANDLEIDING

MANUEL D’UTILISATION

DVM890L GB1

DVM 890L

LCD Standard Digital Multimeter

1. Introduction

This instrument is a compact, rugged, battery-operated hand-held 3 1/2 digit digital multimeter for

measuring DC and AC voltages, DC and AC current and resistance. It also offers the possibility of

executing continuity tests and of testing diodes and transistors. You can also measure capacitance

and temperatures.

The Dual-Slope A/D Converter uses C-MOS technology for auto-zeroing, polarity selection and

overrange indication. Full overload protection is provided. It is an ideal instrument for use in the

field, for laboratories and workshops, for hobby and home applications.

1.1 Features

* Push-button ON/OFF power switch

* 30 different positions on the user-friendly rotary switch for FUNCTION and RANGE

* High sensitivity : 100µV

* Automatic overrange indication with the "1" displayed

* Automatic polarity indication on DC ranges

* All ranges fully protected

* Resistance measurements 0.1Ωto 200MΩ

* Capacitance measurements 1pF to 20µF

* Diode testing with 1mA fixed current

* Transistor hFE test with Ib = -100µA

* Temperature measurement with or without K type thermocouple

1.2 A word about safety

This multimeter is designed to ensure the safest operation possible. However, safe operation

depends on you, the operator. Make sure you follow these simple safety rules :

• Never apply a voltage to the multimeter that exceeds the specified limits. Never apply more than

1000V DC or 700V rms AC between an input jack and ground.

• Use extreme caution when working with voltages above 60V DC or 30V AC rms.

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

test leads.

• Never connect to a voltage source when selecting DCA, ACA, resistance measurement or the

continuity check function.

• Always turn off the power and disconnect the test leads before replacing the batteries or fuse.

• Never operate the multimeter unless the battery cover is in place and fully closed.

When carrying out measurements on TVs or switching power circuits, always remember that

there may be high amplitude voltage pulses at test points which may damage the meter.

DVM890L GB2

2. Front Panel description

1) Display

2) Power On/Off button

3) Transistor test socket

4) RANGE and FUNCTION switch

5) Capacity input sockets

6) Input connection temperature probe

7) mA-input connector

8) V/Ω-input connector

9) 20A MAX input connector

10) COM-input connector



DVM890L GB3

2.1 Function and range selector

Various functions and 32 ranges are provided. A rotary switch is used to select functions as well as

ranges.

2.2 Power switch

A push-button is used to turn the meter on or off.

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

automatically within approx. 15 minutes. To turn the meter on again, push the power switch to

release the Auto Power-Off function and then push it again.

2.3 Input jacks

This meter has four input jacks that are protected against overload to the limits listed below. During

use, connect the black test lead to the COM jack and connect the red test lead in accordance with the

selected function.

FUNCTION RED LEAD

CONNECTION INPUT LIMITS

200mV V/Ω250V dc or rms ac

V& V∼V/Ω1000V dc, 700V ac (sine)

Hz V/Ω250V dc or rms ac

ΩV/Ω250V dc or rms ac

/ V/Ω250V 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

DVM890L GB4

3. Operating instructions

1) Check the 9V battery by setting the ON-OFF switch to the ON position. If the battery is weak, a

"" sign will appear on the display.

If this sign does not appear on the display, proceed as mentioned below. Read MAINTENANCE

if the battery has to be replaced.

2) The sign next to the test lead jacks warns you of the fact that the input voltage or current

should not exceed the indicated values.

This serves to prevent the internal circuitry from damage.

3) The function switch should be set to the desired range before use.

3.1 DC Voltage measurement

1) Connect the black lead (-) to the COM input connector and the red lead (+) to the V/Ωinput

connector.

2) Set the FUNCTION switch to the V range to be used and connect the test leads to the source

or load being tested.

3) The polarity of the RED lead connection will be indicated on the LCD display.

Note :

1) If the voltage range is unknown beforehand, set the FUNCTION switch to a high range and work

your way down.

2) The figure "1" on your display indicates overrange. This means that the FUNCTION switch

should be set to a higher range.

3) Do no apply more than 1000V to the input. Higher voltages can be applied BUT may very

well damage the internal circuitry.

4) Use extreme caution to avoid contact with high tension circuits when measuring sources of high

voltage.

3.2 AC Voltage measurement

1) Connect the black lead (-) to the COM input connector and the red lead (+) to the V/Ω/f input

connector.

2) Set the FUNCTION switch to the appropriate V∼range and connect the test leads to the source

or load being tested.

3) Read the LCD display.

Note :

1) See DC voltage measurement.

2) Do not apply more than 700Vrms to the input. . Higher voltages can be applied BUT may

very well damage the internal circuitry.

4) Use extreme caution to avoid contact with high tension circuits when measuring sources of high

voltage.

DVM890L GB5

3.3 DC Current measurement

1) Connect the black test lead (-) to the COM input connector and the red test lead (+) to the mA

input connector or a maximum of 200mA. Move the red test lead to the 20A MAX input

connector for a maximum of 20A.

2) Set the FUNCTION switch to the A range.

3) Connect the test leads IN SERIES to the load under measurement.

4) Read LCD display. The polarity at the RED test lead connection will be indicated.

Note :

1) If the current range is unknown beforehand, set the FUNCTION switch to a high range and work

your way down.

2) The figure "1" on your display indicates overrange. This means the FUNCTION switch should be

set to a higher range.

3) The maximum input current is 200mA or 20A depending on the jack. Excessive current will

blow the fuse. The 20A range is not protected by a fuse. The fuse rating should not exceed

200mA in order to prevent damage to the internal circuitry.

4) The maximum terminal voltage drop is 200mV.

3.4 AC Current measurement

1) Connect the black test lead (-) to the COM input connector and the red test lead (+) to the 200mA

input connector for a maximum of 200mA.. Move the red test lead to the 20A input connector for

a maximum of 20A.

2) Set the FUNCTION switch to the A ∼range.

3) Connect the test leads IN SERIES to the load being tested.

4) Read the LCD display.

Note :

1) If the current range is unknown beforehand, set the FUNCTION switch to a high range and work

your way down.

2) The figure "1" on your display indicates overrange. This means that the FUNCTION switch

should be set to a higher range.

3) The maximum input current is 200mA or 20A depending on the jack. Excessive current will

blow the fuse. The 20A range is not protected by a fuse. The fuse rating not exceed 200mA in

order to prevent damage to the internal circuitry.

4) The maximum terminal voltage drop is 200mV.

3.5 Resistance measurement

1) Connect the black lead (-) to the COM input connector and the red lead (+) to the V/Ω/f input

connector.

2) Set the FUNCTION switch to the appropriate Ωrange and connect the test leads to the

resistance being tested.

DVM890L GB6

Note :

1) The overrange indication ("1") will be displayed if the resistance value being measured exceeds

the maximum value of the selected range. Consequently, you should select a higher range. It may

take the meter a few seconds to become stable when measuring a resistance of approximately 1

MΩand more. This is normal for high resistance readings.

2) When the input is not connected, i.e. when the circuit is open, the figure " 1 " will be displayed

for the overrange condition.

3) When checking in-circuit resistance, verify whether the circuit being tested is not connected and

whether all capacitors are fully discharged.

4) The open circuit voltage for the 200MΩrange is 3V. Upon shorting the test leads, the display

will show 10 digits. This is normal when encountering a 10MΩresistance value (for the 200MΩ

range). When measuring 100MΩ(for the 200M range), the display reading will be 110. The 10

digits are a constant and should be subtracted from the readings.

5) Some devices may be damaged by the current applied during resistance measurements. The

following table lists the voltage and current available for each range.

A: open circuit voltage at the jack

B: voltage for a resistance equal to full scale value.

C: current in milliampères through a short circuit at the input jacks. All values are typical.

RANGE A B C

200Ω0.65 0.08 0.44

2K 0.65 0.3 0.27

20K 0.65 0.42 0.06

200K 0.65 0.43 0.007

2M 0.65 0.43 0.001

20M 0.65 0.43 0.0001

200M 3 2.98 0.3-3µA

3.6 Capacitance measurements

1) Before connecting the test capacitor, note that the display may show readings other than zero

each time the range is changed. This reading will not affect the accuracy of the device for it will

be overridden by the actual value upon measurement.

2) Connect the test capacitor to the input sockets (not test leads). Check the polarity connections

wherever necessary and set the FUNCTION switch to the CX range.

Note :

1) When testing individual capacitors, insert the leads of the capacitor into the "+" socket (upper

socket) and "-" socket (lower socket), to the left of the panel. (Capacitors should be discharged

before being inserted into the test jack).

2) When testing polarised capacitors (e.g. a tantalum type), particular attention must be paid to the

polarity connections in order to prevent possible damage to the capacitor.

When testing large capacitors, note that there will be a certain time lag before the final reading is

displayed.

Units : 1pF = 10-6µF 1nF = 10-3µF.

Do not connect an external voltage or a charged capacitor (especially larger capacitors) to

the measuring terminals.

DVM890L GB7

3.7 Diode measurement and Continuity test

1) Connect the black lead (-) to the COM input connector and the red lead (+) to the V/Ω/f input

connector.

2) Set the FUNCTION switch to the / range and connect the test leads to the diode under

measurement. The display will show the approx. forward voltage of this diode.

3) For continuity tests : connect the test leads to two random points of the circuit. A buzzer will

sound if the resistance is lower than approx. 30Ω.

3.8 Transistor hFE test

1) Set the FUNCTION switch to the hFE range.

2) Determine whether the transistor is NPN or PNP and locate the emitter, base and collector leads.

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 10 µA,

Vce 2.8V.

3.9 Temperature measurement

1) Measure temperature with a K-type thermocouple : Set the FUNCTION switch to the T-range

and insert the K-type thermocouple plug into the K-PROBE socket.

2) Measure ambient temperature without a probe : Use the same T-range, the display will show the

ambient temperature in °C.

Note :

1) When measuring temperature with a thermocouple, never touch the cold end (the near end plug)

of the thermocouple with your bare hands as your body temperature will affect the accuracy of

the measurement.

3.10 Auto Power-off

Automatic Power-off extends the battery-life by turning the meter off whenever it has been unused

for the last 15 min. The meter turns back on if either the rotary switch is turned or the power switch

is pressed.

DVM890L GB8

4. Specifications

Maximum accuracy is achieved during a one-year period after calibration. Ideal circumstances

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

4.1 General

Maximum display 1999 counts (3 1/2 digits) with automatic polarity

indication and eng. unit.

Indication method LCD display

Measuring method Dual-slope integration A-D converter system

Overrange indication Only "1" is displayed

Maximum common mode voltage 500V dc/ac rms

Reading rate 2-3 readings per sec. (approx.)

Temperature for guaranteed accuracy 23°C ±5°C

Temperature range Operating : 0°C to 40°C, 32°F to 104°F

Storage : -10°C to 50°C, 14°F to 122°F

Power supply 1 x 9V battery

Battery-low indication Battery sign to left of display

Size 88 x 170 x 38mm

Weight 340g (including 9V battery)

Accessories Operating manual.

Set of test leads

Thermocouple (K type, 400°C)

Spare fuse (200mA/250V fast blow) (OPTION)

9V battery

Soft carrying case (OPTION)

4.2 DC Voltage

Range Resolution Accuracy

200mV 100µV

2V 1mV ±0.5% of rdg ±1 digits

20V 10mV

200V 100mV

1000V 1V ±0.8% of rdg ±2 digits

Input impedance : 10MΩfor all ranges

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

DVM890L GB9

4.3 AC Voltage

Range Resolution Accuracy

200mV 100µV ±1.2% of rdg ±3 digits

2V 1mV

20V 10mV ±0.8% of rdg ±3 digits

200V 100mV

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 for the ac ranges, with the exception of

the 200mV AC range (max.15 seconds above 300Vrms)

4.4 DC Current

Range Resolution Accuracy

2mA 1µA ±0.8% of rdg ±1 digits

20mA 10µA

200mA 100µA ±1.2% of rdg ±1 digits

20A 10mA ±2% of rdg ±5 digits

Overload protection : F 0.2A fuse (20A range not fuse-protected)

Maximum input current : 20A, 15 sec.

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% of rdg ±7 digits

Overload protection : F 0.2A fuse (20A range not fuse-protected)

Frequency range : 40 to 400Hz

Maximum input current : 20A 15sec.

Response : average (rms of sine wave)

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