UNI-T UT203 Operating Manual

P/N: 41416301

Registered Design No.: ZL02 3 357791.6

UT203/204

Digital Clamp Multimeters

Model UT203/204: OPERATING MANUAL

Table of Contents

Title

Overview

Unpacking Inspection

Safety Information

Rules For Safe Operation

International Electrical Symbols

The Meter Structure

Rotary Switch

Functional Buttons

The Effectiveness of Functional Buttons

Display Symbols

Measurement Operation

A. DC/AC Voltage Measurement

B. Measuring Resistance

C. Testing Diodes

D. Testing for Continuity

E. Frequency Measurement

F. Duty Cycle Measurement

G. DC/AC Current Measurement

1

Page

3

10

11

12

14

6

9

4

5

22

24

26

28

15

18

18

20

30

Title

Sleep Mode

Specifications

A. General Specifications

B. Environmental Requirements

Accuracy Specifications

A. DC Voltage

B. AC Voltage

C. Resistance

D. Diode Test

E. Continuity Test

F. Frequency

G. Duty Cycle

H. DC Current

I. AC Current

Maintenance

A. General Service

B. Replacing the Battery

2


Page

40

40

42

44

37

37

38

39

44

45

32

33

33

34

35

35

36


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 Safe Operation” carefully before using the Meter.

Digital Clamp Multimeter Model UT203/UT204 (hereafter referred to as “the Meter”) are 3 3/4 digits with steady operations, fashionable structure and highly reliable 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 not only measure AC/DC Voltage, AC/DC Current, Frequency, Duty

Cycle, Resistance, Diodes, Continuity but also it has Data Hold, Sleep Mode and

Relative Mode features.

UT204 has an extra True RMS feature.

3


Unpacking Inspection

Open the package case and take out the Meter. Check the following items carefully to see any missing or damaged part:

Item

3

4

1

2

5

Test Clip

Carrying Bag

Description

English Operating Manual

Test Lead

9V Battery (NEDA1604, 6F22 or 006P)

Qty

1 piece

1 pair

1 pair

1 piece

1 piece

In the event you find any missing or damage, please contact your dealer immediately.

4


Safety Information

This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT. II 600V, CAT. III 300V) and double insulation.

CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient overvoltages than CAT. III.

CAT. III: Distribution level, fixed installation, with smaller transient overvoltages than

CAT. IV

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 to.

International electrical symbols used on the Meter and in this Operating Manual are explained on page 9.

5


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 to the following rules:

l

Before 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.

l

Pay attention to the insulation around the connectors.

Inspect the test leads for damaged insulation or exposed metal. Check the test

l

leads for continuity. Replace damaged test leads with identical model number or electrical specifications before using the Meter.

Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and grounding. If the value to be measured

l

is unknown, use the maximum measurement position and reduce the range step by step until a satisfactory reading is obtained.

When measurement has been completed, disconnect the connection between the test leads and the circuit under test, remove the testing leads away from the input terminals of the Meter and turn the Meter power off.

6


l

The rotary switch should be placed in the right position and no any changeover

l

of range shall be made during measurement is conducted to prevent damage of the Meter.

Do not carry out the measurement when the Meter’s back case and battery compartment are not closed to avoid electric shock.

l

Do not input higher than 600V between the two Meter’s input terminal to avoid electric shock and damages to the Meter.

l

When the Meter working at an effective voltage over 60V in DC or 30V rms in AC, special care should be taken for there is danger of electric shock.

l l

Use the proper terminals, function, and range for your measurements.

Do 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.

l l l

When using the test leads, keep your fingers behind the finger guards.

Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity and diode.

Replace the battery as soon as the battery indicator appears. With a low

l

battery, the Meter might produce false readings that can lead to electric shock and personal injury.

When servicing the Meter, use only the same model number or identical electrical specifications replacement parts.

7


l

When servicing the Meter, use only the same model number or identical electrical

l

specifications replacement parts.

The internal circuit of the Meter shall not be altered at will to avoid damage of

l

the Meter and any accident.

Soft cloth and mild detergent should be used to clean the surface of the Meter

l l

when servicing. No abrasive and solvent should be used to prevent the surface of the Meter from corrosion, damage and accident.

The Meter is suitable for indoor use.

Turn the Meter off when it is not in use and take out the battery when not using

l

for a long time.

Constantly check the battery as it may leak when it has been using for some time, replace the battery as soon as leaking appears. A leaking battery will damage the Meter.

8


International Electrical Symbols

AC (Alternating Current)

DC (Direct Current)

AC or DC

Grounding

Double Insulated

Warning. Refer to the Operating Manual

Deficiency of Built-In Battery

Continuity Test

Diode

Fuse

Conforms to Standards of European Union

9


The Meter Structure (see figure 1)

1.

2.

3.

4.

5.

6.

7.

Input Terminals

LCD Display

Functional Buttons

Rotary Switch

Trigger: press the lever to open the transformer jaws. When the pressure on the lever is released, the jaws will close.

Hand Guards: to protect user’s hand from touching the dangerous area.

Transformer Jaw: designed to pick up the AC and

DC current flowing through the conductor. It could transfer current to voltage. The tested conductor must vertically go through the Jaw center.

(figure 1)

10


Rotary Switch

Below table indicated for information about the rotary switch positions.

Rotary Switch Position

OFF

V

40A

/

Hz / Duty%

& 400A

Function

Power is turned off

AC or DC voltage measurement

Resistance measurement

: Diode test

: Continuity test

Frequency Measurement and Duty

Measurement

AC and DC current measurement range

11


Functional Buttons

Below table indicated for information about the functional button operations.

Button

HOLD

Operation Performed

REL

is default to auto ranging measurement mode.

to step down the range.

and displays a result.

At Hz/Duty% range:

measurement mode.

12


Button Operation Performed

SELECT

Press SELECT button to select the alternate functions marked in

turn the Meter on, it will disable the Sleep Mode feature.

13


The Effectiveness of Functional Buttons

Not every functional buttons can be used on every rotary switch positions. Below table describe which functional buttons can be used on which rotary switch positions

Rotary Switch

Positions

V

/

Hz / Duty%

40A

400A

SELECT

l

N/A

l

N/A

l l

Functional Buttons

REL

l l

N/A

l l l

HOLD

l l l l l l

14


Display Symbols (see figure 2)

15

3

2

4

14

1

7 8 9

16

(figure 2)

15

5

6

10

11

12

13


7

8

9

5

6

Number

1

2

3

4

Symbol

AC

DC

%

Meaning

Indicator for AC voltage or current

Indicator for DC voltage

The battery is low.

Warning: To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator appears.

The Meter is in the auto range mode in which the Meter automatically selects the range with the best resolution.

Test of diode

The continuity buzzer is on

Indicator for Duty.

Data hold is active

Indicator for REL mode

16


Number

10

Symbol

,k ,M

11

12

13

14

15

16

Hz

A mV, V

TRMS

OL

Meaning

: Ohm. The unit of resistance.

k : Kilohm. 1x103 or 1000 ohms

M : Megohm. 1x106 or 1,000,000 ohms

The unit of Frequency

Amperes (amps). The unit of current.

Volts. The unit of voltage.

mV: Millivolt. 1x10-3 or 0.001 volts

Indicates negative reading

Indicator for TRMS mode

The input value is too large for the selected range

17


Measurement Operation

A. DC/AC Voltage Measurement (see figure 3)

Warning

To avoid harms to you or damages to the Meter from eletric shock, do not attempt to measure voltages higher than 600V AC/DC, although readings may be obtained.

The DC Voltage ranges are:

400mV, 4V, 40V, 400V and 600V.

The AC Voltage ranges are:

4V, 40V, 400V and 600V.

Red Black

(figure 3)

To measure DC voltage, connect the Meter as follows:

1.

Insert the red test lead into the Hz Duty% terminal and the black test lead into the COM terminal.

18


2.

manual ranging measurement mode.

3.

Connect the test leads across with the object being measured.

The measured value shows on the display.

Note

l

When DC/AC voltage measurement has been completed, disconnect the connection between the testing leads and the circuit under test and remove testing leads from the input terminals.

19


B. Measuring Resistance (see figure 4)

Warning

To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring resistance.

The resistance ranges are:

400 , 4k , 40k ,400k ,M and 40M .

Red Black

To measure resistance, connect the Meter as follows:

1.

Insert the red test lead into the Hz Duty%

terminal and the black test lead into the

(figure 4)

COM terminal.

2.

Set the rotary switch to . Resistance measurement is default to auto range mode,

3.



20


Note

l l

To obtain a more precise reading, you could remove the objects being tested from the circuit when measuring.

When resistance measurement has been completed, disconnect the connection between the testing leads and the circuit under test and remove testing leads from the input terminals.

21


C. Testing Diodes (see figure 5)

Warning

To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before testing diodes.

Use the diode test to check diodes, transistors, and other semiconductor devices. The diode test sends a current through the semicondutor junction, then measure the voltage drop across the junction. A good silicon junction drops between 0.5V and 0.8V.

Red Black

(figure 5)

To test the diode out of a circuit, connect the Meter as follows:

1.

Insert the red test lead into the Hz Duty% terminal and the black test lead into the COM terminal.

22


2.

Set the rotary switch to . Diode measurement mode is a default or presss

SELECT to select measurement mode.

3.

For forward voltage drop readings on any semiconductor component, place the red test lead on the component’s anode and place the black test lead on the component’s cathode.

Note

l l

To obtain a more precise reading, you could remove the objects being tested from the circuit when measuring.

When diode testing has been completed, disconnect the connection between the testing leads and the circuit under test and remove testing leads from the input terminals.

23


D. Testing for Continuity (see figure 6)

Warning

To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring continuity.

To test for continuity, connect the Meter as follows:

1.

Insert the red test lead into the Hz Duty%

terminal and the black test lead into the

2.

COM terminal.

Set the rotary switch to and press SELECT

Red Black

3.

button to select measurement mode.

The buzzer sounds if the resistance of a circuit

(figure 6)

4.

under test is less than 50

The buzzer may or may not sounds if the resistance of a circuit under test is between 50 to 100

5.

The buzzer does not sound if the resistance of a circuit under test is higher than

100

24


Note

l

When continuity testing has been completed, disconnect the connection between the testing leads and the circuit under test and remove testing leads from the input terminals.

25


E. Frequency Measurement (see figure 7)

Warning


The resistance ranges are:

10Hz, 100Hz, 1kHz, 10kHz, 100kHz, 1MHz and

10MHz.

Red Black

To measure frequency, connect the Meter as follows:

1.

Insert the red temperature probe into the Hz

Duty% terminal and the black temperature probe into the COM terminal.

(figure 7)

2.

Set the rotary switch to Hz.

3.



26


Note

l

When frequency measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

27


F. Duty Cycle Measurement (see figure 8)

Warning


The duty cycle range is: 0.1%~99.9%.

Red Black

To measure duty cycle, connect the Meter as follows:

1.

Insert the red temperature probe into the Hz Duty%

terminal and the black temperature probe

into the COM terminal.

(figure 8)

2.

mode.

3.



28


Note

l

When duty cycle measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter.

29


G. DC/AC Current Measurement (see figure 9)

The measuremnet ranges of current are: 40.00

A

To measure current, do the following:

40A

400A

1.

measuremnet mode is a default. Press SELECT to switch between DC and AC measurement mode.

2.

Hold the Meter tight, don’t release. The Hall components are very senstive not only to the magnet but also to heat and machines reaction force. Any shock will cause the changing in reading in the short time.

(figure 9)

3.

Press the lever to open the transformer jaw.

4.

Center the conductor within the transformer jaw, then release the Meter slowly until the trasnformer jaw is completely closed, Make sure the conductor to be tested is placed at the center of the transformer jaw, otherwise it will casue deviation.

The Meter can only measure one conductor at a time, to meausre more than one condutor at a time will cause deviation..

30


Note

l l and displays a result.

When current measurement has been completed, disconnect the connection between the conductor under test and the jaw, and remove the conductor away from the transformer jaw of the Meter.

31


Sleep Mode

To preserve battery life, the Meter automatically turns off if you do not turn the rotary switch or press any button for around 15 minutes.

The Meter can be activated by turning the rotary switch or pressing the button based on ‘The Effectiveness of Functional Buttons” on page 14. Press SELECT to activate the Meter will disable the Sleep Mode feature.

The Meter beeps 5 times in about 1 minute before entering Sleep Mode and it will have a 1 long beep just before entering Sleep Mode.

To disable the Sleep Mode function, press and hold SELECT button while turning on the Meter.

32


Specifications

A. General Specifications:

l l l l l l l l l l l l

Maximum Voltage between any Terminals and grounding: Refer to different range input protection voltage.

Display: 3 3/4 digits LCD display, Maximum display 3999

Polarity: Automatically display.

Overloading: Display OL or –OL

Battery Deficiency: Display

Measurement Speed: Updates 3 times/second.

Measuremnet Deviation: The conductor being meaured is not placed in the center of the jawt during AC/DC current measurement, it will cause extra 1% deviation based on the stated accuracy.

Drop Test: 1 meter drop test passed.

Max. Jaw Size: 28mm diameter.

Projected Max. Current conductor size: 26mm diameter.

Electro-Magnetic: When carrying out measurement near the electro-magnetic, it may cause unstable or wrong reading.

Power: 1 x 9V battery (NEDA1604 or 6F22 or 006P)

33


l l l l

Battery Life: typically 150hours (alkaline battery)

Sleep Mode (can be disabled)

Dimensions (H x W x L): 208mm x 76mm x 30mm.

Weight: Approximate 260g (battery included)

B. Environmental Requirements

l l l l

The Meter is suitable for indoor use.

Altitude: Operating: 2000m

Storage: 10000m

Safety/ Compliances: IEC 61010 CAT.II 600V, CAT.III 300V over voltage and double insulation standard.

Temperature and humidity:

Operating: 0ºC~30ºC ( 85%R.H);

30ºC~40ºC ( 75%R.H);

40ºC~50ºC ( 45%R.H);

Storage: -20ºC~+60ºC ( 85%R.H)

34


Accurate Specifications

Accuracy: (a% reading + b digits), guarantee for 1 year.

Operating temperature: 23ºC 5ºC

Relative humidity: 85%R.H

Temperature coefficient: 0.1x(specified accuracy)/1ºC

A. DC Voltage

Range

400.0mV

4.000V

40.00V

400.0V

600V

Resolution

0.1mV

1mV

10mV

100mV

1V

Remarks: Input impedance: 10M

Accuracy

(0.8%+3)

(0.8%+1)

(1%+3)

Overload protection

600V DC/AC

35


B. AC Voltage

Range

4.000V

40.00V

400.0V

600V

Resolution

1mV

10mV

100mV

1V

Accuracy

(1%+5)


600V DC/AC

(1.2%+5)

Remarks:

l

Input impedance: 10M // less than 100pF l l

Frequency response: 40Hz~400Hz.

Change to AC:

UT203:

Change to AC by using average response method. Input sine wave, then adjust the reading until it is same as the effective value.

UT203:

Combine AC and True RMS response method. Input sine wave to adjust. Non sine wave must follow the below data to adjust:

Peak factor: 1.4~2.0, add 1.0% on the stated accuracy


Peak factor: 2.5~3.0, add 4.0% on the stated accuracy.

36


C. Resistance

Range

400.0

4.000k

40.00k

400.0k

4.000M

40.00M

Resolution

100m

1

10

100

1k

10k

Accuracy

(1.2%+2)

(1%+2)

(1.2%+2)

(1.5%+2)


600Vp

D. Diode Test

Range Resolution

1mV

Accuracy

Display forward voltage drop nearest value


600Vp

Remark: Open circuit voltage approximate 1.48V.

37


E. Continuity Test

Range Resolution

100m

Accuracy

Around 50 , the buzzer beeps


600Vp

Remark:

l l

Open circuit voltage approximate 0.45V.

The buzzer may or may not beeps when the resistance of a circuit under test is l between 50 ~100

The buzzer will not beep when the resistance of a circuit under test is > 100 .

38


F. Frequency

Range

10Hz

100Hz

1kHz

10kHz

100kHz

1MHz

10MHz

Resolution

0.001Hz

0.01Hz

0.1Hz

1Hz

10Hz

100Hz

1kHz

Remark:

Input Sensitivity as follows:

When 100kHz: 300mV rms;

When > 100kHz: 600mV rms

When > 1MHz: 800mV rms

Accuracy

(0.1%+3)

For reference only


600Vp

39


G. Duty Cycle

Range

0.1%~99.9%

Resolution

0.1%

Accuracy

For reference only


600Vp

H. DC Current

Range

40.00A

400.0A

Resolution

0.01A

0.1A

Accuracy

(2%+5)

(2%+3)


400A DC/AC

Warning

The operating temperature must be 0ºC ~40ºC when measuring current.

Remark:

l

If the reading is positive, the current direction is from bottom to up. See figure 10, the front case face up while the bottom case face down. Hold the Meter tight, do now release. The Hall components are very sensitive not only to the magnet but

40


l also to heat and machines reaction force. Any shock will cause the changing in reading in the short time. Follow the below procedure to measure current will be more precise:

Hold the Meter tight and press the lever to open the transformer jaw. Center the conductor within the transformer jaws, then release the Meter slowly until the transformer jaw is completely closed. Make sure the conductor to be tested is placed at the center of the transformer jaw, otherwise it will cause +1.0% deviation based on the stated accuracy.

Remove the transformer jaw.

l l l l

Repeat the above 1. procedure.

The obtained reading will be more precise.

41


I. AC Current

Range Resolution Accuracy

40.00A

0.01A

(2.5%+8)

400.0A

0.1A

(2.5%+5)

Frequency Response

50Hz ~ 60Hz


400A DC/AC

Warning

The operating temperature must be 0ºC ~40ºC when measuring current.

Remark:

l

It may have 10 digits or less unstable or wrong digits, it will not affect measurement l result.

Hold the Meter tight, do now release. The Hall components are very sensitive not only to the magnet but also to heat and machines reaction force. Any shock will cause the changing in reading in the short time. Follow the below procedure to measure current will be more precise:

1.

Hold the Meter tight and press the lever to open the transformer jaw. Center the conductor within the transformer jaws, then release the Meter slowly until the transformer jaw is completely closed. Make sure the conductor to be tested is placed at the center of the transformer jaw, otherwise it will cause +1.0% deviation based on the stated accuracy.

42


2.

3.

4.

5.

Remove the transformer jaw.

Repeat the above 1. procedure.

The obtained reading will be more precise.

l Change to AC:

UT203:

Change to AC by using average response method. Input sine wave, then adjust the reading until it is same as the effective value.

UT204:

Combine AC and True RMS response method. Input sine wave to adjust. Non sine wave must follow the below data to adjust:



Peak factor: 2.5~3.0, add 4.0% on the stated accuracy.

43


MAINTENANCE

This section provides basic maintenance information including battery replacement instruction.

Warning

Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance test, and service information.

To avoid electrical shock or damage to the Meter, do not get water inside the case.

A. General Service

l l l l l

Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents.

To clean the terminals with cotton bar with detergent, as dirt or moisture in the terminals can affect readings.

Turn the Meter power off when it is not in use.

Take out the battery when it is not using for a long time.

Do not use or store the Meter in a place of humidity, high temperature, explosive, inflammable and strong magnetic field.

44


B. Replacing the Battery (see figure 10)

Warning

To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator “ ” appears.

Screw

Make sure the transformer jaw and the tets leads are disconected from the circuit being tested before opening the case bottom.

To replace the battery:

(figure 10)

1.

2.

3.

4.

5.

Turn the Meter off and remove all the connections from the input terminals

Turn the Meter’s front case down.

Remove the screw from the battery compartment, and separate the battery compartment from the case bottom.

Take out the old battery and replace with a new 9V battery (NEDA1604, 6F22 or

006P.

Rejoin the case bottom and the battery compartment, and reinstall the screw.

** END **

This operating manual is subject to change without notice.

45

Copyright 2005 Uni-Trend Group Limited.

All rights reserved.

Manufacturer:

Uni-Trend Technology (Dongguan) Limited

Dong Fang Da Dao

Bei Shan Dong Fang Industrial Development District

Hu Men Town, Dongguan City

Guang Dong Province

China

Postal Code: 523 925

Headquarters:

Uni-Trend Group Limited

Rm901, 9/F, Nanyang Plaza

57 Hung To Road

Kwun Tong

Kowloon, Hong Kong

Tel: (852) 2950 9168

Fax: (852) 2950 9303

Email: [email protected]

http://www.uni-trend.com

46


UNI-T UT203 Operating Manual

Digital Clamp Multimeters

Table of Contents

Title

1

Page

Title

2

Page

Overview

Warning

3

Unpacking Inspection

Item

Description

Qty

4

Safety Information

5

Rules For Safe Operation

Warning

6

7

8

International Electrical Symbols

9

The Meter Structure (see figure 1)

10

Rotary Switch

Rotary Switch Position

OFF

V

40A

/

Hz / Duty%

& 400A

Function

11

Functional Buttons

Button

HOLD

Operation Performed

REL

12

Button Operation Performed

SELECT

13

The Effectiveness of Functional Buttons

Rotary Switch

Positions

V

/

Hz / Duty%

40A

400A

SELECT

N/A

N/A

Functional Buttons

REL

N/A

HOLD

14

Display Symbols (see figure 2)

15

Number

Symbol

AC

DC

%

Meaning

Warning: To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator appears.

16

Number

Symbol

,k ,M

Hz

A mV, V

TRMS

OL