Unit UT56 Manuale utente

Contents

A. Your Meters Feature

B. Specifications

C. Making Measurements

D. Maintenance

E. Accessories

F. Using Holster

G. Using Strap

Introduction

UT56 is one type of UNI-T brand new UT50 series

Multimeters with 4 1/2 digits, which has steady

function and is a highly reliable hand-held measuring

instrument. The Meter uses large scale of integrated

circuit with double integrated A/D converter as its

core and has full range overload protection. The

Meter can measure DC current, AC current, DC

Voltage, AC Voltage, Resistance, Capacitance,

Diode, Transistor, Frequency and Continuity Beeper,

which is an ideal measuring tool for users.

Model UT56: OPERATING MANUAL

Safety Rules

l Use the Meter only as specified in this

manual, otherwise the protection provided

by the Meter may be impaired.

l Do not operate the Meter before the cabinet

has been closed and screwed safely as

terminalcan carry voltage.

l Make sure before each measurement the

Meter is set to the suitable range.

l Before using the Meter, please inspect

the cabinet and test leads for damaged

insulation or exposed metal.

l Connect the red and black test lead to the

correct measuring input jack properly.

l Do not input values over the maximum range

of each measurement to avoid damages of

the Meter.

l Do not turn the rotary function switch during

Voltage and Current measurement, otherwise

the Meter could be destroyed .

l Make sure to use new fuses with proper

rating in stead of bad fuses.

l To avoid electric shock or damages, do not

apply more than 1000V between the"COM"

terminals and ""earth ground.

l Use caution when working with Voltages

above 60V (DC) or 30Vrms (AC). These

Voltages pose shock hazard.

Model UT56: OPERATING MANUAL

Low Battery Earth Ground

Safety Rules Double Insulated

AC Diode

Dangerous Voltages

DC Buzzer

Fuse

l Replace the battery as soon as the battery

indicator""appears. With a low battery,

the Meter might produce false readings

that can lead to electric shock and personal

injury.

l Turn off the Meter once finished measuring.

Fetch out the battery, when the meter will

not be used for long period.

l Do not operate the Meter under adverse

environmental condition including high

temperature and especially humid area as

the Meter's function may be effected after

moisturizing.

l To avoid damages and dangerous, do not

change the circuit on your own.

l Periodically wipe the cabinet with a damp

cloth and mid detergent. Do not use

abrasives or solvents.

l Dispose the used battery proper.

l International Electrical Symbols.

Model UT56: OPERATING MANUAL

A. Your Meters Feature

“ ”

Model UT56: OPERATING MANUAL

B-3 Direct Current Current (DC Current)

2mA

20mA

200mA

20A

0.1µV

1µV

10µV

1mV

Range Resolution

(0.8% +5)

Accuracy

(2% +10)

(0.5% +5)

Overload protection: Below 200mA with 0.3

A/250V Fused. No fuse protection on 20A.

Max current input: 20A(above 10Afor 15 seconds

maximum).

Measuring voltage drop: Full ranges are 200mV.

B-4 Alternate Current Current (AC Current)

2mA

20mA

200mA

20A

0.1µV

1µV

10µV

1mV

Range Resolution

(1.2% +10)

Accuracy

(2.5% +10)

(0.8% +10)

Overload protection: Below 200mA with0.3A/

250V Fused. No fuse protection on 20A.

Max current input:20A(above 10Afor 15seconds

maximum).

Measuring voltage drop: Full ranges are 200mV

Display: Average value(RMS of Sine Wave).

Model UT56: OPERATING MANUAL

B-5 Resistance

200Ω

2KΩ

20KΩ

200KΩ

2MΩ

20MΩ

200MΩ

0.01Ω

0.1Ω

1Ω

10Ω

100Ω

1KΩ

10KΩ

Range Resolution Accuracy

(0.3% +1)

(0.5% +10)

(0.5% +1)

[5.0%(-1000) +10]

(0.3% +3)

Overload protection: All ranges are 250VDC

or AC RMS.

Caution:

1) At 200MΩrange, test lead is short circuit, the

LCD display 1000 digits, deduct the 1000

digits from the measured reading during

measuring.

2) At 200Ωrange, short the test lead first to display

the resistance value of the test leads. Deduct

that resistance value from the measured reading

to obtain the being measured object correct

value .

B-6 Capacitance

Testing Signals: About 400Hz, 40mVrms.

2nF

20nF

200nF

2µF

20µF

0.1pF

1pF

10pF

0.1nF

1nf

Range Resolution Accuracy

(4% +20)

Model UT56: OPERATING MANUAL

2-7 Frequency

Range Resolution Accuracy

20kHz 1Hz(1.5% +5)

Input sensitivity: <200mVrms, Max. input

scope 30Vrms.

Overload protection: 250Vrms.

2-8 Diode and Continuity Beeper

Overload protection: 250V DC orAC RMS.

B-9 Transistor hFE test

Range Remark Measuring Condition

Display Diode

Forward Voltage

Value, unit is "V"

Forward DC Current abt

1mA, Backward DC

Voltage abt3.0V

Beeper sounds when

Resistance < 50Ω.

Display the nearest

value, unit is "kΩ"

Voltage at open Circuit

abt 3.0V

Range Remark Measuring Condition

hFE Can Measure NPN

and PNP type

Transistor, Display

ranges: 0-1000 β

Basic polarity current abt

10µA,Vce abt 3.0V

Model UT56: OPERATING MANUAL

C. Making Measurements

Caution:

1On/Off Switch 2Capacitance jack

3Liquid Crystal Display 4Date Hold Switch

5Rotary switch 6Transistor jack

7Input jack

(1) If there is no display or is shown on the

LCD when the Meter is switched on, replace

the battery ASAP.

(2) Never exceed the maximum input voltage or

current limits shown besides the input jacks

, otherwise the Meter will be damaged

and this is dangerous to life.

(3) Turn the rotary switch to proper range before

operating.

“ ”

Model UT56: OPERATING MANUAL

C-1 Measuring DC Voltage

1. Connect the black test lead to COM jack and

red test lead to Vjack.

2. Set the rotary switch to V .

3. Connect the test leads across with the object

to be measured. LCD appears the measured

value and also the polarity of the red test leads.

“ ”

Caution

1) If magnitude of the voltage is unknown, always

start with the highest range and reduce until

satisfactory reading is obtained.

2) If 1is shown on the LCD, which means the

Meter is overloaded, then set the measuring

range to higher.

3) means never exceed the maximum input

limit 1000V, otherwise internal circuit of the

Meter will be damaged.

4) Take extra care of voltage leakage when

measuring high voltage.

C-2 Measuring AC Voltage

“ ”

1. Connect the black test lead to COM jack

and red test lead to Vjack.

2. Set the rotary switch to V~ .

3. Connect the test leads across with the object

to be measured.

“ ”

“ ”“ ”

Caution

1) Refer to DC Voltage Caution 1, 2, 4.

2) means never exceed the maximum input

limit 750V, otherwise internal circuit of the

Meter will be damaged.

“ ” “ ”

“ ”

Model UT56: OPERATING MANUAL

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