Unit UT90A Manuel utilisateur

Model UT90A: OPERATING MANUAL=VC220

Table of Contents

Title Page

Overview

Unpacking Inspection

Safety Information

Rules For Safe Operation

International Electrical Symbols

The Meter Structure

LCD Indicators

Rotary Switch

Functional Buttons

Measurement Operation

A. AC/DC Voltage Measurement

B. AC/DC Current Measurement

C. Resistance Measurement

D. Diodes Measurement

E. Continuity Measurement

F. Power Voltage Measurement

General Specifications

Accuracy Specifications

A. DC Voltage

B. AC Voltage

C. DC Current

D. AC Current

E. Resistance

F. Diodes Test

G. Continuity Test

Fuse Replacement

Maintenance

Model UT90A: OPERATING MANUAL

Overview

This Operating Manual covers information on

safety and cautions. Please read the relevant

information carefully and observe all the

Warnings and Notes strictly.

Warning

To avoid electric shock or personal injury,

read the “Safety Information” and “Rules for

Safety Operation” carefully before using the

Meter.

The Model UT90A(hereafter referred to as “the

Meter”) is a 1999 counts low power waste

electrical tester with and stabilize functions,

safety operations, and reliable performance.

In addition to the conventional measuring

function, such as DC/AC voltage, resistance,

diode and continuity and power voltage test, it is

also a highly applied digital electrical tester of

good performance with big size full functions

symbols indication, full overload protection and

special appearance.

Unpacking Inspection

Open the package case and take out the Meter.

Check the following items carefully to see any

missing or damaged part:

Item

Description

Qty

Operating Manual

piece

Test Lead

pair

Model UT90A: OPERATING MANUAL

certificate

1 piece

In the event you find any missing or damage,

please contact your dealer immediately.

Safety Information

This Meter complies with GB4793 standard for

safety electrical measuring and test equipment,

and IEC61010-1: in pollution degree 2,

overvoltage category (CAT II 1000V, CAT III

600V) and double insulation.

Use the Meter only as specified in this operating

manual, otherwise the protection provided by the

Meter may be impaired.

In this manual, a Warning identifies conditions

and actions that pose hazards to the user, or

may damage the Meter or the equipment under

test.

A Note identifies the information that user should

pay attention on.

International electrical symbols used on the

Meter and in this Operating Manual are

explained on page XXX.

Rules For Safe Operation

Warning

To avoid possible electric shock or personal

injury, and to avoid possible damage to the

Meter or to the equipment under test, adhere

Model UT90A: OPERATING MANUAL

to the following rules:

lBefore using the Meter inspect the

case. Do not use the Meter if it is

damaged or the case (or part of the

case) is removed. Look for cracks or

missing plastic. Pay attention to the

insulation around the connectors.

lInspect the test leads for damaged

insulation or exposed metal. Check the

test leads for continuity. Replace

damaged test leads with identical

model number or electrical

specifications before using the Meter.

lWhen using the test leads, keep your

fingers behind the finger guards.

lDo not apply more than the rated

voltage, as marked on the Meter,

between the terminals or between any

terminal and grounding.

lWhen the Meter working at an effective

voltage over 60V in DC or 30V in AC,

special care should be taken from there

is danger of electric shock.

lUse the proper terminals, function, and

range for your measurements.

lThe rotary switch should be placed in

the right position and no any

changeover of range shall be made

during measurement is conducted to

prevent damage of the Meter.

lDisconnect circuit power and discharge

all high-voltage capacitors before

testing resistance, diodes or continuity.

lCharge as soon as the Meter indicator

appears to keep precision of the

Model UT90A: OPERATING MANUAL

readings.

lRemove test leads from the test circuit

before changeover of range. Turn the

Meter power off before connect the

Meter to circuit and check the fuse

before measuring current.

lWhen servicing the Meter, use only the

same model number or identical

electrical specifications replacement

parts.

lThe internal circuit of the Meter shall not

be altered will to avoid damage of the

Meter and any accident.

lSoft cloth and mild detergent should be

used to clean the surface of the Meter

when servicing. No abrasive and solvent

should be used to prevent the surface of

the Meter from corrosion, damage and

accident.

lTurn off the Meter when it is not in use

for a long time.

lDo not use or store the Meter in an

environment of high temperature,

humidity, explosive, inflammable and

strong magnetic field. The performance

of the Meter may deteriorate after

dampened.

International Electrical Symbols

AC (Alternating Current).

DC (Direct Current).

Grounding.

Double Insulated.

Model UT90A: OPERATING MANUAL

Deficiency of Built-In Battery.

Warning. Refer to the Operating

Manual.

China Technology Supervision

Bureau, license for measuring

instrument Manufacture

Conforms to Standards of European

Union.

The Meter Structure (see figure 1)

?LCD Display.

?Impedance changeover button.

?Rotary Switch.

?Input Terminals.

?Power Button.

LCD indicators(see figure 2)

?~appear at AC measurement, disappear

at DC measurement.

?display the minus readings.

?high voltage indicator.

?battery deficiency indicator.

?continuity measurement indicator.

?diodes measurement indicator.

?Connect Terminal terminal connect indicator.

O?KO?MOResistance unit

MV?VVoltage unit

µA?mA?ACurrent unit

Rotary Switch

Model UT90A: OPERATING MANUAL

Below table indicated for information about the

rotary switch positions.

Rotary

Switch

Positio

Function

V DC voltage measurement range

from 200.0mV to 1000V.

VAC voltage measurement range

from 2.000V to 750.0V.

OOResistance measurement range

from 200.0Oto 20.00MO.

Diode test.

Continuity test.

ADC current measurement range

from 200.0mA to 20.00A.

AAC current measurement range

from 200.0µA to 20.00A.

Power voltage measurement

Turn on/off the Meter.

Functional Buttons

Below table indicated for information about the

functional button operations.

Button Measur

ing

Functi

Operation Performed

Model UT90A: OPERATING MANUAL

Impeda

nce

change

over

button

AC/DC

voltage

range

It is used to inspect

the resistance of

supply power under

250V

MAX.(??????)

Any

rotary

switch

position

Turn the power of the

Meter on or off.

Measurement Operation

A.AC/DC Voltage Measurement (see figure

Warning

To avoid harms to you or damages to the

Meter from electric shock, please do not

attempt to measure voltages higher than

1000V DC/750V AC although readings may be

obtained.

Impedance Changeover Button turn on time

should=3 seconds. To avoid damages to the

Meter, please do not use the Impedance

Changeover Button when the measured

voltage is higher than 250V.

The DC voltage ranges are: 200.0mV, 2.000V,

20.00V, 200.0V, 1000V; The AC voltage ranges

are: 2.000V, 20.00V, 200.0V, 750.0V. To measure

Model UT90A: OPERATING MANUAL

AC/DC voltage, connect the Meter as follows:

1. Insert the red test lead into the“VO)”

terminal and the black test lead into the

COM terminal.

2. Set the rotary switch to“V”or“V”,and

Connect the test leads across with the

power or load being measured.

3. The measured value shows on the

display,which is an effective value of sine

wave (mean value response).

4. In each range, the Meter has an input

impedance of 10MO. This loading effect

can cause measurement errors in high

impedance circuits. If the circuit impedance

is less than or equal to 10kO, the error is

negligible (0.1% or less).

5. Manual Impedance Changeover

Button“10MO/400kO”can be used to check

inside impedance of supply power under

250V MAX.

Note

lWhenAC/DC voltage measurement has

been completed, disconnect the connection

between the testing leads and the circuit

under test.

lPay attention to avoid harms to you from

electric shock during high voltages

measurement.

B.AC/DC Current Measurement (see figure

Warning

Model UT90A: OPERATING MANUAL

To avoid damages to the built-in fuse and the

Meter, please do not attempt parallel connect

the test leads with any circuit while the test

leads are inserted into the current terminal.

For the safety requirement, when measure

high current, every measure time should<10

seconds and the time between two

measurements should >15 minutes.

The measurement ranges of DC current are:

200mA,2mA,20mA,200mA,20A; The

measurement ranges of AC current are:

200.0µA,2.000mA,20.00mA,200.0mA and

20.00A. To measure current, do the following:

1Insert the red test lead into the“µA

mA ”or“20A”terminal and the black test

lead into the COM terminal.

2Set the rotary switch to“A”or“A”,and

Connect the test leads across with the

circuit being measured.

3. The measured value shows on the display,

it is an effective value of sine wave (mean

value response).

Note

lTurn off the power of circuit being

measured before series connection

between the Meter and the circuit.

lUse proper terminals and ranges for the

measurement.

lPlease use the ranges from high to low if

the current not being confirmed.

lWhen current measurement has been

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