00-05-4166 MS2128, MS2108T(C15

MS2128, MS2108T

DIGITAL CLAMP METER

OPERATION MANUAL

CAT III

600V

CONTENTS

1. Safety Information............................1

1.1 Preliminary

............................................1

1.2 During use ..

.

...

...

...................................2

1.3 Symbols............

....................................3

1.4 Maintenance............

.............................3

2. Description.......................................

4

2.1 Names OF Parts....................................5

2.2 Switch, Buttons And Input Jacks

............7

2.3 Names OF Parts ..................................7

3. Specifications ..................................9

3.1 General Specifications

........................9

3.2 Technical Specifications ......................9

4. Operation Instruction

.......................15

4.1 Holding Readings

.................................15

4.2 Switching Ranges .................................15

4.3 Switching Frequency Or Duty ................16

4.4 Switching Maximum Or

4.5 Switching Functions ..............................17

4.6 Back Light And Clamp Lighting Bulb

.......17

CONTENTS

4.7 Auto Power Off...........................................18

4.8 Preparing For Measurement ........................19

4.9 Measuring Ac Current

..............................19

4.10 Measuring Inrush Current ........................21

4.11 Measuring Dc Current

..............................23

4.12 Measuring Ac Voltage ..............................25

4.13 Measuring Dc Voltage ..............................26

4.14 Measuring Frequency

..............................29

4.15 Measuring Duty

.......................................33

4.16 Measuring Resistance

.............................37

4.17 Testing Diode

..........................................39

4.18 Testing Continuity ....................................41

4.19 Measuring Capacitance ...........................43

5. Maintenance.......................................45

5.2 Replacing Test Leads .................................46

6. Accessories.......................................46

1. Safety Information

WARNING

Be extremely careful when using this meter. Improper use of this device can result in electric shock or destruction of the meter. Take all normal safety precautions and follow the safeguards suggested in this manual.

To exploit full functionality of the meter and ensure safe operation, please read carefully and follow the directions in this manual. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

This meter is designed and manufactured according to safety requirements of EN 61010-1, EN 61010-2-032, EN 61010-2-033 concerning electronic measuring instruments with a measurement

CAT III 600V and pollution degree 2 and safety requirements for hand-held clamps for electrical measurement and test.

With proper use and care, this digital multimeter will give you years of satisfactory service.

1.1 Preliminary

1.1.1 When using the meter, the user must observe all normal safety rules concerning:

- General protection against electric shock

- Protection of the meter against misuse.

1.1.2 When the meter is delivered, check whether it has been damaged in transit.

1.1.3 After being stored and delivered under harsh conditions, the meter should be checked and confirmed whether any damages have been incurred.

1.1.4 Test leads must be kept in good condition. Before using check whether the insulation on test leads has been damaged and any wire has been exposed.

1.1.5 Use the test leads supplied to ensure operation

safety. If required, they must be replaced with test leads of the same model or class.

01

1.2 During Use

1.2.1 Use the right input jack, function and range.

1.2.2 Do not take measurements that exceed the

protection limit values indicated in the specifications.

1.2.3 Do not touch the metal tips of the test leads when the meter is connected to the circuit to be measured.

1.2.4 Keep your fingers behind the probe barriers when taking a measurement with an effective voltage above

60V DC or 30V rms AC.

1.2.5 Do not take voltage measurement if the value between the terminals and earth ground exceeds 600V.

1.2.6 Select the highest range if the value scale to be

measured in the manual range is unknown.

1.2.7 Disconnect the test leads from the circuit under test before turning the rotary selector to change functions.

1.2.8 Do not measure the resistance, capacitance, diode or continuity of live circuits.

1.2.9 Do not connect the meter to any voltage source

while the rotary selector is in the current, resistance, capacitance, diode or continuity range.

1.2.10 Do not take capacitance measurements until the capacitor to be measured has been fully discharged.

1.2.11 Do not use the meter near explosive gases, steam or dirt.

1.2.12 Stop using the meter if any abnormalities or faults are observed.

1.2.13 Do not use the meter unless its rear case and battery cover is securely fastened in its original position.

1.2.14 Do not store or use the meter in areas exposed to direct sunlight, at high temperature or with high relative humidity.

02

1.3 Symbols

Note-Important safety information, refer to the instruction manual.

Application around and removal from UNINSULATED

HAZARDOUS LIVE conductors is permitted.

Caution, possibility of electric shock

Equipment protected throughout by double insulation or reinforced insulation.

Conforms to UL STD. 61010-1, 61010-2-032,

61010-2-033; Certified to CSA STD C22.2 NO.

61010-1, 61010-2-032,61010-2-033

Complies with European (EU) safety standards

Earth (ground) TERMINAL

Direct current

Alternating current

CAT III: MEASUREMENT CATEGORY III is applicable to test and measuring circuits connected to the distribution part of the building's low-voltage MAINS installation.

1.4 Maintenance

1.4.1 Do not attempt to remove the rear case to adjust or repair the meter. Such actions should only be performed by a technician who fully understands the meter and the danger involved.

1.4.2 Before opening the case and battery cover of the meter, always disconnect test leads from all sources of electric current. Disconnect the test leads from all sources of electric current before opening the rear case and battery cover of the meter.

1.4.3 To avoid any electric shock caused by error readings, replace the batteries immediately when the “ ” sign

03 appears on the display.

1.4.4 Use damp cloth and mild detergent to clean the meter; do not use abrasives or solvents.

1.4.5 Turn the rotary selector to OFF position to switch off the power when the meter is not in use.

1.4.6 Remove the batteries to avoid damages to the meter if it will idle for a long time.

2. Description

- This meter is a portable professional measuring instrument with LCD and back light easily reading. The

'single-hand operation' design for the range switch makes measurement simple and easy. Overload protection and low battery indication are provided. It is an ideal multifunction Instrument with scores of practical applications for professional, workshop, school, hobby and home use.

- The meter can perform measurements of AC/DC voltage and current, resistance, frequency, duty, capacitance, as well as continuity and diode test.

- Both auto range and manual range are available.

- This meter is equipped with reading hold function.

- This meter is equipped with true root mean square value measuring function (at AC A and AC V range).

- This meter is equipped with inrush current measuring function.

- This meter is equipped with auto zero function

(at DCA range).

- This meter is equipped with maximum value measuring function.

- This meter is equipped with minimum value measuring function.

- This meter can measure frequency by clamp.

- This meter has function of auto power off.

04

- The normal function of the product may be disturbed by strong

Electro-Magnetic interference. If so, simply reset the product to resume normal operation by following the instruction manual.

In case the function could not resume, please use the product in other location.

2.1 Names Of Components

(1) Current Clamp

(2) Clamp Lighting Bulb

(3) Panel

(4) Trigger

(5) Function Switch Button (S E L)

(6) MAX/MIN Switch Button (MAX/MIN)

(7) Auto/Manual Switch Button (RAN)

(8) Liquid Crystal Display (LCD)

(9) COM Jack

(10) Input Jack

(11) Hz/Duty Switch Button (Hz/%)

(12) Reading Hold/Back Light Button (HOLD/B.L)

(13) Rotary selector

(14) OFF - power switch

(15) “+” Symbol

(16) “-” Symbol

(17) Rear Case

(18) Fixing Screw of Battery Cover

(19) Battery Cover

(20) Protective Barrier (to warn the operator of the limit of

safe access)

1

2

3

4

5

6

7

8

9

05

15

14

13

12

11

10

17

18

19

16

20

CAUTION

ACCORD WITH:

IEC 61010-2-032

IEC 61010-2-033

IEC 61010-1

600V CAT III

06

2.2 Switch, Buttons And Input Jacks

HOLD/B.L Button

- For holding the reading or control backlight

S E L Button

- For switching among measuring functions

RAN Button

- For switching between auto and manual ranges.

Hz/% Button

- For switching between frequency and duty measuring

functions.

MAX/MIN Button

- For switching between maximum and minimum value

measuring function.

Rotary Selector

- For selecting functions and ranges.

OFF Position

- for turning off the power.

INPUT Jack

- For measuring voltage, resistance, frequency, duty,

capacitance, diode, and continuity.

COM Jack

- Common input connection for current, voltage, resistance,

frequency, duty, capacitance, diode, continuity

measurement.

Clamp

- For measuring current

2.3 LCD (Liquid-crystal display)

AUTO MANU MAX MIN ZERO

°C°F%

μmVA nμmF

MkΩ

Hz

TRMS INRUSH

07

AC

DC

AUTO

MANU

MAX

MIN

ZERO

TRMS

H

INRUSH

% mV, V

A

μF, mF

Ω, kΩ,

Hz, kHz

Alternating current

Direct current

Diode test

Continuity buzzer

Auto range mode

Manual range mode

The maximum value is being measured.

The minimum value is being measured.

DCA zero

Auto power off

Battery low

True RMS

This indicates that the display data is being held.

Inrush current is being measured.

Percent (Duty cycle)

Milli-volts, Volts (Voltage)

Amperes (Current)

Micro-farad, Milli-farad (Capacitance)

Ohms, Kilo-ohms, Mega-ohms

(Resistance)

Hertz, Kilo-hertz (Frequency)

08

3. Specifications

Calibration is required once a year, to be carried out at a temperature between 18°C and 28°C (64°F to 82°F) and relative humidity below 75%.

3.1 General Specifications

3.1.1 Auto range and manual range options are available.

3.1.2 Over range protection is provided for all ranges.

3.1.3 Maximum voltage between terminals and earth

ground: 600V DC or True RMS AC

3.1.4 Operating altitude: max. 2000 meters (7000 ft.)

3.1.5 Display: LCD

3.1.6 Maximum value display: 6599 digits for MS2128

6599 digits for MS2108T

3.1.7 Polarity indication: automatic; ‘-’ for negative polarity.

3.1.8 Over range indication: ‘0L’ or ‘-0L’

3.1.9 Sampling Time: approx. 0.4 second per sample

3.1.10 Unit indication: function and unit.

3.1.11 Auto power off time: 30 min.

3.1.12 Operating power : 1.5V×3 AAA batteries

3.1.13 Battery low indication: ‘ ’ on LCD

3.1.14 Temperature factor: < 0.1×Accuracy /°C

3.1.15 Operating temperature: 0°C to 40°C(32°F to 104°F)

3.1.16 Storage temperature: -10°C to 50°C(10°F to 122°F)

3.1.17 Dimension: 208×78×35mm

3.1.18 Weight: approximate 340g(including batteries)

3.2 Electrical Specifications

Ambient temperature: 23±5°C Relative humidity: < 75%

3.2.1 TRUE RMS

3.2.1.1 For measuring non-sinusoidal waveforms, test

error which is occurred by using True RMS

measurement techniques is less than by using

traditional average-reading techniques.

09

3.2.1.2 Both sinusoidal and non-sinusoidal waveforms

can be tested by True RMS Clamp Meter exactly.

At AC A & AC V ranges, even short two test probes

there are still1-50 digits might be displayed on

LCD. This is normal. Test result will not be affected.

3.2.1.3 At AC A and AC V range, True RMS value can be

tested only when input signal is more than 2% of

full range.

3.2.1.4 To ensure the precision of test result, input signal

should be:

AC voltage: > 13 mV

AC current: > 1.3A

3.2.2 AC Current

Range

66A

600A

Resolution

0.01A

0.1A

Accuracy

±(3.0% of rdg + 10 digits)

- Max. input current: 600A

- Frequency range: 40 to 400Hz

- Response: true root mean square value

3.2.3 Inrush Current

Range

66A

600A

Resolution

0.01A

Accuracy

<60A take it only as referance

0.1A

±(10.0% of rdg + 60 digits)

- Integration Time: 100ms

- Measurement range: 30 ~ 600A

- Max. input current: 600A

- Frequency range: 40 to 400Hz

- Response: true root mean square value

10

3.2.4 DC Current

Range

66A

Resolution

0.01A

600A 0.1A

Accuracy

±(3.0% of rdg + 10 digits)

- Max. input current: 600A DC

3.2.5 DC Voltage

Range Accuracy

Resolution

660mV

6.6V

66V

600V

0.1mV

0.001V

0.01V

0.1V

±(0.8% of rdg + 3digits)

±(1.0% of rdg + 5digits)

- Input impedance: 10MΩ

- Max. input voltage: 600V DC

Note:

At small voltage range, unsteady readings will appear before the test leads contact the circuit. This is normal because the meter is highly sensitive. When the test leads contact the circuit, the true reading will be shown.

3.2.6 AC Voltage

Range

Resolution

Accuracy

660mV

0.1mV

±(1.5% of rdg + 10digits)

6.6V

0.001V

±(1.2% of rdg + 5digits)

66V

0.01V

600V 0.1V

±(1.5% of rdg + 10digits)

- Input impedance: 10MΩ

- Max. input voltage: 600V True RMS AC

- Frequency range: 40 to 400Hz

- Response: true root mean square value

Note:

At small voltage range, unsteady readings will appear before the test leads contact the circuit. This is normal because the meter is highly sensitive. When the test leads contact the circuit, the true reading will be shown.

3.2.7 Frequency

3.2.7.1 By A range ( from current clamp):

Range Accuracy

Resolution

660Hz

1kHz

>1kHz

0.1Hz

0.0011Hz

0.0011Hz

±(1.5% of rdg + 5 digits)

Take it only as referance

- Measurement range: 10 ~ 1kHz

- Input current range: >10A True RMS AC (higher input

current at higher frequency)

- Max. Input current: 600A True RMS AC

12 11

3.2.7.2 By V range:

Range

Resolution

Accuracy

660Hz

6.6kHz

10kHz

>10kHz

0.1Hz

0.001kHz

0.01kHz

0.01kHz

±(1.5% of rdg + 5 digits)

Take it only as referance

- Measurement range: 10 ~ 10kHz

- Input voltage range:>0.2V True RMS AC (higher input

voltage at higher frequency)

- Input impedance: 10MΩ

- Max. input voltage: 600V True RMS AC

3.2.8 Duty Cycle

Range

10 - 95%

Resolution

0.1%

Accuracy

±3.0%

3.2.8.1 By A range ( from current clamp):

- Frequency response: 10 ~1kHz

- Input current range:>10A True RMS AC (higher input

current at higher frequency)

- Max. input current: 600A

3.2.8.2 By V range:

- Frequency response: 10 ~ 10 kHz

- Input voltage range:>0.2V True RMS AC (higher input

voltage at higher frequency)

- Input impedance: 10MΩ

- Max. input voltage: 600V True RMS AC

13

3.2.9 Resistance

Range Accuracy

Resolution

660Ω 0.1Ω

6.6kΩ

66KΩ

0.001kΩ

0.01kΩ

±(1.2% of rdg + 2digits)

660kΩ

0.1kΩ

6.6MΩ

66MΩ

0.001MkΩ

0.1MΩ

±(2.0% of rdg + 5digits)

- Open circuit voltage: 0.5V

3.2.10 Diode

Range

Resolution

0.001V

Function displaying

approximate for

ward voltage of diode

- Forward DC current~1mA

- Reversed DC voltage~3.2V

3.2.11 Continuity

Range

Resolution Function

0.1Ω

- Open circuit voltage~1V

Built-in buzzer will sound,

if resistance is lower than

50±20Ω.

14

3.2.12 Capacitance

For MS2128:

Range

6.6µF

66µF

660µF

6.6mF

Resolution

0.001µF

Accuracy

±( 4.0% of rdg + 50digits)

0.01µF

0.1µF

0.001mF

±(4.0% of rdg + 3 digits)

66mF 0.01mF

For MS2108T:

Range

9.999nF

99.99nF

Resolution

0.001nF

Accuracy

±( 5.0% of rdg + 5 digits)

0.01nF

999.9nF

9.999µF

99.99µF

0.1nF

0.001µF

0.01µF

±( 4.0% of rdg + 5 digits)

999.9µF

9.999mF

99.99mF

0.1µF

0.001mF

0.01mF

4. Operation Instruction

4.1 Holding Readings

4.1.1 Press the “HOLD/B.L” button to hold the readings

while taking measurement and the value on the

display will be held.

4.1.2 Press the “HOLD/B.L” button again to release the

reading hold function.

4.2 Switching Ranges

4.2.1 When the meter is turned on, it is at the auto

range

mode for measuring current, voltage, resistance,

15

capacitance and frequency.

4.2.2 Press the"RAN" button for manual range mode. The

range will go up one level at each press and return

to the lowest level when the highest level is reached.

4.2.3 Press the "RAN" button for one or more seconds

to

return to the auto range.

4.2.4 Press the “RAN” button to get back to normal test

during working in maximum or minimum

value

measuring function,

Note:

At frequency range, meter can't be set to manual range mode.

4.3 Switching Frequency Or Duty

4.3.1 During working at the voltage or current ranges,

press the “Hz/%” button one time, frequency of the

voltage or current will be measured. Press the

“Hz/%” button twice, the meter will be changed into

the duty range for measuring the duty cycle of the

voltage or current. At the same time, the meter is

changed into manual mode.

4.3.2 Press the “Hz/%” button again, meter will be back

to the condition of the voltage or current measuring.

Note:

During working at maximum or minimum value measuring function, the meter can't be changed into frequency or duty cycle measuring mode.

4.4 Switching Maximum Or Minimum Value

4.4.1 At all ranges, press the "MAX/MIN" button one

time,

the meter can be set to maximum value measuring

mode; press the button three times, the meter will

get back to normal test mode, and the maximum and

minimum value will be recorded by

the chip.

4.4.2 Press the ”MAX/MIN” button more than one second

or press the“RAN” button, the meter will get back to

normal test.

16

Note:

1) During measuring maximum or minimum value, the

meter will be set to manual mode automatically.

2) During working at frequency or duty measuring

function, the meter can't be changed into maximum

or minimum value measuring mode.

4.5 Switching Functions

4.5.1 AC A range

4.5.1.1 Press the “SEL” button, the meter will get

into inrush current test mode.

4.5.1.2 If press the “SEL” button again, the meter

will get into inrush current test mode again.

4.5.1.3 Press the “SEL” button more than one second

or press the “RAN”button, the meter will get

back to normal test mode.

4.5.2 DC A range

4.5.2.1 Press the “SEL” button, the meter will get

into zero.

4.5.2.2 If press the “SEL” button again, the meter

will get into zero again.

4.5.2.3 Press the “SEL” button more than one

second or press the “RAN” button, the meter

will get back to the normal test mode.

4.5.3 Press the “SEL” button to switch between AC

and DC measurement at the voltage ranges.

4.5.4 Press the ”SEL” button to switch among

resistance, diode and continuity ranges.

4.6 Back Light And Clamp Lighting Bulb

4.6.1 Press the “HOLD/B.L” button for two or more

seconds to switch on the back light if the light

in the environment is too dim for taking reading,

which will last for 60 seconds.

17

4.6.2 During the back light is working, press the

“HOLD/B.L” button for two or more seconds, it

will be turned off.

4.6.3 At the current range, when the back light is

switched on, the clamp lighting bulb will be turned

on at the same time.

Note:

- LED, which requires a larger working current, is the

main source of back light. Although the meter is

equipped with a timer set at 60 seconds (i.e. the back

light will be off automatically after 60 seconds),

frequent use of the back light will shorten the life of

the batteries. Therefore, do not use the back light

unless necessary.

-

When the battery voltage is<3.7V, the symbol “ ”

(battery low)will appear on the LCD. When the back

light is on, even if the batter is>3.7V, the “ ” may

appear because of its large working current which

will cause the voltage to drop. (The accuracy

of the measurement cannot be assured when the

“ “ symbol appears.) In this case, you need not

replace the batteries yet. Normally, the batteries

can last until the “

” appears when the back light

is not being used.

4.7 Auto Power Off

4.7.1 If there is no any operation within any thirty minutes

after power is on, meter will auto power off.

4.7.2 After auto power off, if press the “SEL” button,

meter will recover the working condition.

4.7.3 Press both power on switch and one of

”MAX/MIN”

or “RAM”or “Hz/%”button at the same time more

than one second for exiting auto power off function.

18

4.8 Preparating For Measurement

4.8.1 Switch on the power by turning the rotary selector.

If the battery voltage is lower than 3.7V, the “

symbol will appear and the batteries should be

replaced.

4.8.2 The “

” symbol shows that the input voltage or

current should not exceed the specified value in

order to protect the internal circuit from damage.

4.8.3 Turn the rotary selector to the required function and

range to be measured. Under the manual mode,

choose the highest range when the value scale to be

measured is unknown.

4.8.4 Connect the common test lead first and then the

charged test leads when making connection. Take

away the charged test lead first when disconnecting.

4.9 Measuring AC Current

WARNING

Beware of Electrocution. Ensure that the test leads are disconnected from the meter before making current clamp measurements.

4.9.1 Set the rotary selector to the A range position.

4.9.2 Auto range mode or manual range mode can be

selected by pressing the“RAN”button.

4.9.3 Press the trigger to open jaw. Fully enclose only one

conductor.

4.9.4 Take the reading on the LCD.

Note:

1) Do not put more than one cable into the jaw during test,

otherwise incorrect test value might be obtained.

2) For optimum results, center the conductor in the jaw.

3) At the manual range mode, when only ‘O L’ is shown on

the LCD, it means the measurement has exceeded the

range. A higher range should be selected.

19

4) Under the manual range mode, when the scale of the

value to be measured is unknown beforehand, set the

range to the highest.

5) “ ” means the maximum input current is 600A rms AC.

Correct

20

Incorrect

4.10 Measuring Inrush Current

WARNING

Beware of Electrocution.

Ensure that the test leads are disconnected from the meter before making current clamp measurements.

4.10.1 Set the rotary selector to the A range position.

4.10.2 Press the trigger to open jaw. Fully enclose

only one conductor.

4.10.3 Press the “SEL” to enter the INRUSH current

measurement mode. Then LCD displays

“- - - -” until the motor starting up and being

detected. The detection will be done only one

time and the output reading will be hold.

4.10.4 Take the reading on the LCD.

Note:

1) Do not put more than one cable into

the jaw during test, otherwise incorrect

test value might be obtained.

2) For optimum results, center the conductor in the jaw.

3) At the manual range mode, when only ‘O L’ is shown

on the LCD, it means the measurement has

exceeded the range. A higher range should

be selected.

4) Under the manual range mode, when the scale of

the value to be measured is unknown beforehand,

set the range to the highest.

5) “ ” means the maximum input current is

600A rms AC.

21

Correct

22

Incorrect

4.11 Measuring DC Current

WARNING

Beware of Electrocution.

Ensure that the test leads are disconnected from the meter before making current clamp measurements.

4.11.1 Set the rotary selector to the A range position.

4.11.2 Auto range mode or manual range mode can be

selected by pressing the “RAN” button.

4.11.3 Press the “SEL” button, the meter will be set

to zero.

4.11.4 Press the trigger to open jaw. Fully enclose only

one conductor.

4.11.5 Take the reading on the LCD.

4.11.6 Symbol “-” will be displayed on LCD if the

direction of the current is negative.

Note:

1) Do not put more than one cable into the jaw during

test, otherwise incorrect test value might be

obtained.

2) For optimum results, press the “SEL” button to

make the meter get into zero first.

3) For optimum results, center the conductor in the jaw.

4) At the manual range mode, when only 'O L' or '-O L'

is shown on the LCD, it means the measurement

has exceeded the range. A higher range should

be selected.

5) Under the manual range mode, when the scale

of the value to be measured is unknown beforehand,

set the range to the highest.

6) “ ”means the maximum input current is 600A DC.

23 24

4.12 Measuring AC Voltage

WARNING

Beware of Electrocution.

Pay special attention to avoid electric shock when measuring high voltage.

Do not input the voltage which more than

600V rms AC.

4.12.1 Plug the black test lead into the COM jack and

the red test lead into the INPUT jack.

4.12.2 Set the rotary selector to V position to make

the meter get into AC V range.

4.12.3 Auto range mode or manual range mode can

be selected by pressing the “RAN” button.

4.12.4 Connect the test leads to the voltage source or

load terminals for measurement.

4.12.5 Take the reading on the LCD.

Note:

1) At small voltage range, unsteady readings may

appear before the test leads contact the circuit.

This is normal because the meter is highly sensitive.

When the test leads contact the circuit, the true

reading will be shown.

2) At the manual range mode, when only 'OL' is shown

on the LCD, it means the measurement has exceeded

the range. A higher range should be selected.

3) At the manual range mode, when the scale of the

value to be measured is unknown beforehand, select

the highest range first and lower the range gradually.

4) “ ” means the maximum input voltage is 600V rms AC.

5) If the test result is more than 610V rms AC, symbol

“OL” will be displayed on LCD and the build-up

buzzer will sound.

25

4.13 Measuring DC Voltage

WARNING

Beware of Electrocution. Pay special attention to avoid electric shock when measuring high voltage.

Do not input the voltage which more than 600V DC.

4.13.1 Plug the black test lead into the COM jack and

the red test lead into the INPUT jack.

4.13.2 Set the rotary selector to at the V range position.

4.13.3 Press the“SEL” button to turn to DC V range.

Auto range mode or manual range mode can be

selected by pressing the “RAN” button.

4.13.4 Connect the test leads to the voltage source or

load terminals for measurement.

4.13.5 Take the reading on the LCD. The polarity

symbol denotes the polarity of the end

connected by the red test lead.

Note:

1) At small voltage range, unsteady readings will

appear before the test leads contact the circuit.

This is normal because the meter is highly sensitive.

When the test leads contact the circuit, the true

reading will be shown.

2) Under the manual range mode, when only

‘O L ’ o r ‘- O L’ is shown on the LCD, it means the

measurement has exceeded the range. A higher

range should be selected.

3) Under the manual range mode, when the scale

of the value to be measured is unknown beforehand,

select the highest range first and lower the

range gradually.

26

4) “ ” means the maximum input voltage is 600V DC.

5) If the test result is more than 610V DC, symbol “O L”

will be displayed on LCD and the build-up buzzer

will sound.

9V

27 28

4.14 Measuring Frequency

4.14.1 By A range (from current clamp):

WARNING

Beware of Electrocution.

Ensure that the test leads are disconnected from the meter before making current clamp measurements.

4.14.1.1 Set the rotary selector to the A range

(A~ or A ) position.

4.14.1.2 Press the trigger to open jaw. Fully enclose

only one conductor.

4.14.1.3 Press the “Hz/%” to switch to the frequency

measurement.

4.14.1.4 Take the reading on the LCD.

Note:

1) Do not put more than one cable into the jaw during

test, otherwise incorrect test value might be obtained.

2) Frequency test range is 10Hz - 1kHz.‘00.0’ will be

displayed on LCD if the test frequency is lower than

10.0 Hz. It is possible to test the frequency which is

higher than 1 kHz but the tolerance of the test result

can not be ensure.

3) “ ” means the maximum input current is

600A rms AC.

29 30

4.14.2 By V range:

WARNING

Beware of Electrocution.

Pay special attention to avoid electric shock when measuring high voltage.

Do not input the voltage which more than

600V rms AC.

4.14.2.1 Plug the black test lead into the COM jack

and the red test lead into the INPUT jack.

4.14.2.2 Set the rotary selector to the V range

position.

4.14.2.3 Press the "Hz/%" to switch to frequency

measurement.

4.14.2.4 Connect test leads to the two ends of the

source or load for measurement.

4.14.2.5 Take the reading on the LCD.

Note:

1) Frequency test range is 10Hz -10kHz. '00.0' will be

displayed on LCD if the test frequency is lower than

10.0 Hz. It is possible to test the frequency which is

higher than 10kHz but the tolerance of the test result

can not be ensure.

2) “ ” means the maximum input voltage is

600V rms AC.

31

Correct

32

Incorrect

4.15 Measuring Duty

4.15.1 By A range ( from current clamp):

WARNING

Beware of Electrocution.

Ensure that the test leads are disconnected from the meter before making current clamp measurements.

4.15.1.1 Set the rotary selector to the A range

( A or A ) position.

4.15.1.2 Press the trigger to open jaw. Fully enclose

only one conductor.

4.15.1.3 Press the "Hz/%" to switch to the DUTY

measurement.

4.15.1.4 Take the reading on the LCD.

Note:

1) Do not put more than one cable into the jaw during

test, otherwise incorrect test value might be obtained.

2) If the duty cycle is less than 10%, symbol 'UL' will be

displayed on LCD; if the duty cycle is more than

94.9%, symbol 'O L' will be displayed on LCD.

3) The input signal frequency range is 10 – 1kHz. It is

possible to test duty cycle of the higher than 1 kHz

frequency signal, but the tolerance of the test result

can not be ensure.

4) “ ” means the maximum input current is

600A rms AC.

33 34

4.15.2 By V range:

WARNING

Beware of Electrocution.

Pay special attention to avoid electric shock when measuring high voltage.

Do not input the voltage which more than

600V rms AC.

4.15.2.1 Plug the black test lead into the COM jack and

the red test lead into the INPUT jack.

4.15.2.2 Set the rotary selector to the V range position.

4.15.2.3 Press the "Hz/%" to switch to DUTY

measurement.

4.15.2.4 Connect test leads to the two end of the source

or load for measurement.

4.15.2.5 Take the reading on the LCD.

Note:

1) If the duty cycle is less than 10%, symbol 'UL' will be

displayed on LCD; if the duty cycle is more than

94.9%, symbol 'O L' will be displayed on LCD.

3) The input signal frequency range is 10 – 10 kHz. It is

possible to test duty cycle of the higher than 10 kHz

frequency signal, but the tolerance of the test result

can not be ensure.

3) “ ” means the maximum input voltage is

600V rms AC.

35 36

4.16 Measuring Resistance

WARNING

Beware of Electrocution.

When measuring in-circuit resistance, make sure that the power of the circuit under test has been turned off and that all capacitors have been fully discharged.

4.16.1 Plug the black test lead into the COM jack and

the red test lead into the INPUT jack.

4.16.2 Set the rotary selector to the Ω range

position to make the meter get into Ω range.

4.16.3 Auto range mode or manual range mode can be

selected by pressing the “RAN” button.

4.16.4 Connect the test leads to the ends of the resistor

or circuit for measurement.

4.16.5 Take the reading on the LCD.

Note:

1) At the manual range mode, when only 'O L' is shown

on the LCD, it means the measurement has exceeded

the range. A higher range should be selected.

2) When the input is open, 'O L' will appear on the LCD

to indicate that the range has been exceeded.

3) For measuring resistance above 1MΩ, it may take

a few seconds to get a steady reading. This is normal

for high resistance reading.

37 38

4.17 Testing Diode

4.17.1 Plug the black test lead into the COM jack and

the red test lead into the INPUT jack.

4.17.2 Set the rotary selector to the Ω range

position.

4.17.3 Press the "S E L" button to switch to test.

4.17.4 Connect the red test lead to the anode and the

black test lead to the cathode of the diode for

testing.

4.17.5 Take the reading on the LCD.

Note:

1) The meter will show the approximate forward voltage

drop of the diode.

2) When the test leads have been reversed or open,

'O L' will appear on the LCD.

39 40

4.18 Testing Continuity

WARNING

Beware of Electrocution.

Make sure that the power of the circuit has been turned off and the capacitors have been fully discharged before testing the continuity of a circuit.

4.18.1 Plug the black test lead into the COM jack and

the red test lead into the INPUT jack.

4.18.2 Set the rotary selector to the Ω range

position.

4.18.3 Press the "S E L" button to switch to continuity

test.

4.18.4 Connect the test leads to the two ends of the

circuit for measurement.

4.18.5 If the resistance of the circuit being tested is less

than 50±20Ω, the built-in buzzer will sound.

4.18.6 Take the reading on the LCD.

Note:

If the test leads are open or the resistance of the circuit is over 660Ω (for MS2128) or 600Ω (for MS2108T) , “O L” will appear on the LCD.

41 42

4.19 Measuring Capacitance

WARNING

Beware of Electrocution.

To avoid electric shock, make sure that the capacitors have been fully discharged before measuring the capacitance of a capacitor.

4.19.1 Plug the black test lead into the COM jack and

the red test lead into the INPUT jack.

4.19.2 Set the rotary selector to the range position.

4.19.3 After fully discharged the capacitor, connect the

test leads to the two ends of the capacitor for

measurement.

4.19.4 Take the reading on the LCD.

Note:

It may take some time (about 10 seconds for the

66mF range) for steady readings when measuring high capacity.

43 44

5. Maintenance

5.1 Replacing The Batteries

WARNING

To avoid electric shock, make sure that the test leads have been clearly move away from the circuit under measurement before opening the battery cover of the meter.

WARNING

Do

not mix old and new batteries. Do not mix alkaline, standard (carbon-zinc), or rechargeable

(ni-cad, ni-mh, etc) batteries.

5.1.1 If the sign “ ” appears, it means that the

batteries should be replaced.

5.1.2 Loosen the fixing screw of the battery cover and

remove it.

5.1.3 Replace the exhausted batteries with new ones.

5.1.4 Put the battery cover back and fix it again to its

origin form.

Note:

Do not reverse the polarity of the batteries.

5.2 Replacing Test Leads

Replace test leads if leads become damaged or worn.

WARNING

Use meet EN 61010-031 standard, rated CAT III 600V, or better test leads.

WARNING

To avoid electric shock,make sure the probes are disconnected from the measured circuit before removingthe rear cover. Make sure the rear cover is tightly screwed before

using the instrument.

6. Accessories

1)

2)

3)

4)

Test Leads

Operating Manual

1.5V AAA Battery

Case

1 pair

1 piesce

3 pieces

1 piece

45 46

R-00-05-1584

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