UNI-T UT56 Operating Manual

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.

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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

terminal can 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

V oltage 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.

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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 T urn 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.

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A. Your Meters Feature

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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 10A for 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 10A for 15seconds maximum). Measuring voltage drop: Full ranges are 200mV Display: Average value(RMS of Sine Wave).

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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 200MΩ range, test lead is short circuit, the LCD display 1000 digits, deduct the 1000 digits from the measured reading during measuring.

2) At 200Ω range, 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)

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2-7 Frequency

Range Resolution Accuracy

20kH

z 1Hz

(1.5% +5)

Input sensitivity: <200mVrms, Max. input scope 30Vrms. Overload protection: 250Vrms.

2-8 Diode and Continuity Beeper

Overload protection: 250V DC or AC 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

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C. Making Measurements Caution:

1 On/Off Switch 2 Capacitance jack 3 Liquid Crystal Display 4 Date Hold Switch 5 Rotary switch 6 Transistor jack 7 Input 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.

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C-1 Measuring DC Voltage

1. Connect the black test lead to COM jack and red test lead to V jack.

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.

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Caution

1) If magnitude of the voltage is unknown, always start with the highest range and reduce until satisfactory reading is obtained.

2) If 1 is 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

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1. Connect the black test lead to COM jack and red test lead to V jack.

2. Set the rotary switch to V~ .

3. Connect the test leads across with the object to be measured.

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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.

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C-3 Measuring DC Current

1. Connect the black test lead to COM jack . When measuring below 200mA, connect the red test lead to mA jack. When measuring 20A or below, connect the red test lead to 20A jack.

2. Set the rotary switch to A

3. Connect the test leads in series with the object to be measured, the LCD display the measuring value and polarity of red test lead.

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“ ” .

Caution

C-4 Measuring AC Current

1. Connect the black test lead to COM jack. When measuring below 200mA, connect the red test lead to “mA” jack. When measuring 20A or below, connect the red test lead to 20A jack.

2. Set the rotary switch to A~ .

3. Connect the test leads in series with the object to be measured.

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1) Please refer to DC Current Caution 1, 2, 3.

Caution

1) If magnitude of the current is unknown, always start with the highest range and reduce until satisfactory reading is obtained.

2) If 1 is shown on the LCD, which means the Meter is overloaded, then set the measuring range to higher.

3)

means the maximum input current is 200 mA, overload will cause the burn of fuse. 20A range does not have fuse protection

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C-5 Measuring Resistance

Before measuring capacitance, remember it takes time for zeroing when changing ranges. Floating reading do not effect accuracy.

Caution

1) If 1 is shown on the LCD, which means the Meter is overloaded, then set a higher measuring range. If resistance is above 1MΩ, the reading will only be steady after few seconds which is normal for measuring high value of resistance.

2) 1 is displayed when no input(e.g. open circuit).

3) Make sure all objects, circuit and components to be measured are without voltage and discharge all high-voltage capacitors.

4) At 200MΩ range, test lead is short circuit, it has 1000 digits which need to be deducted from the reading when making measurement. For example, when measuring 100MΩ, it displays 1 10.00, 1000 digits need to be deducted (means 1 10.00-10.00=100.00MΩ).

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1. Connect the black test lead to COM jack and red test lead Ω jack.

2. Set rotary switch to Ω .

3. Connect the test leads across with the object to be measured.

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1) To avoid damage of the Meter or the equip ment under testing, disconnect circuit powers and discharge capacitors before measuring capacitance.

2) Connect capacitor to the capacitance jack.

C-6 Measuring Capacitance

Caution

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3) Stabilizing reading takes some time when measuring high capacitance. Unit : 1pF=10

-6

µF, 1nF = 10-3µF

C-7 Measuring Frequency

When measuring above 30Vrms, accuracy could not be guaranteed and take extra care of safety as voltage brings dangerous electricity by that time.

Caution

C-8 Measuring Diode and Continuity beeper

1. Set the black test lead to COM jack and red test lead to VΩ jack (Red test lead polarity is + ), Set the rotary switch to .

2. Connect the test lead across with the object being measured.The reading is diode forward voltage drop nearest value.

3. Connect the test lead to two ends of the object being measured, the beeper sounds if the resistant value between the two ends is below 50Ω .

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C-9 Measuring Transistor hFE

1. Set rotary switch to hFE .

2. Identify NPN or PNP type, connect objects to the correspondent transistor jack.

3. LCD appears the hFE nearest value.

4. Measuring condition: Ib 10µA, Vce 3.0V.

1. Connect red test lead to Hz jack and black test lead to COM jack.

2. Set the rotary switch to kHz .

3. Connect the test leads across with the object being measured. LCD appears the frequency value.

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C-10 Auto-Power Off function

1. Meter equips with auto-power off function. It will be in a sleep condition when it has worked for 30 minutes. Power will be automatically cut off.

2. Press the on/off switch two times to power up again.

D. Maintenance

The Meter is a highly precise electrical testing instrument, do not attempt to change the circuit of your Meter on your own. Take a note of the following few points.

1. Do not connect to DC Voltage above 1000V or AC RMS above 750V.

2. Do not input voltage when the rotary switch is in Current Range Ω .

3. Do not operate the Meter if battery is not inside or bottom cabinet is not securely screwed.

4. Disconnect the test leads and power off the Meter before replacing the Battery and Fuses.

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E. Accessories

1. A book of users manual

2. A pair of test lead

3. A piece of holster (if selected)

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F. Using Holster

Three different ways to use holster:

1. Set holster parallel on the table, do not open the tilt stand (see diagram 1)

2. Set holster in a small angle on the table, tilt it up by the first part of tilt stand (see diagram 2)

3. Set holster in a large angle on the table, tilt it up by all two parts of tilt stand (see diagram 3).

figure1 figure2 figure3

G. Using Strap

1. Put the front end of the strap through the round metal of the Meter, see part 1 of the below diagram.

2. Put the bottom end of the strap through the front part and tide it up, see part 2 of the below diagram.

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~ END ~

* The manual is subject to changes without separate notice. *

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Manufacturer: UNI-TREND TECHNOLOGY(DONG GUAN)LIMITED Address: Dong Fang Da Dao, Bei Shan Dong Fang Industrial Development District, Hu Men Town, Dong Guan City, Guang Dong Province, China Headquarters: Uni-Trend International Limited Address: Rm901, 9/F, Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon, Hong Kong Tel: (852) 2950 9168 Fax: (852) 2950 9303 Email: info@uni-trend.com http://www.uni-trend.com

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