Mastech MS2128, MS2108T Operation Manual

MS2128, MS2108T

DIGITAL CLAMP METER

OPERATION MANUAL

CAT III

600V

1.1 Preliminary

1.2 During use

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

CONTENTS CONTENTS

1. Safety Information

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4

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

2. Description

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2.1 Names OF Parts

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2.2 Switch, Buttons And Input Jacks

2.3 Names OF Parts

3. Specifications

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4. Operation Instruction

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3.1 General Specifications

3.2 Technical Specifications

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4.1 Holding Readings

4.2 Switching Ranges

4.3 Switching Frequency Or Duty

4.4 Switching Maximum Or
Minimum Value

4.5 Switching Functions

4.6 Back Light And Clamp Lighting Bulb

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

4.8 Preparing For Measurement

4.9 Measuring Ac Current

4.10 Measuring Inrush Current

4.11 Measuring Dc Current

4.12 Measuring Ac Voltage

4.13 Measuring Dc Voltage

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4.14 Measuring Frequency

4.15 Measuring Duty

4.16 Measuring Resistance

4.17 Testing Diode

4.18 Testing Continuity

4.19 Measuring Capacitance

5. Maintenance

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5.1 Replacing The Batteries

5.2 Replacing Test Leads

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6. Accessories

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1. Safety Information

Wi th pro per use and ca re, this di gital mul time ter will gi ve
yo u year s of sat isf acto ry servic e.

1.1 Preliminary

1.1.1 When us ing the m eter, th e user mu st obse rve all
normal safe ty rule s conce rning :

- Gene ral pro tecti on agai nst ele ctric s hock

- Prot ectio n of the me ter aga inst mi suse.

1.1.2 When th e meter i s deliv ered, c heck wh ether i t has
been damaged in tran sit.

1.1.3 After be ing sto red and d elive red und er hars h
condition s, the me ter sho uld be ch ecked a nd conf irmed
whether any d amage s have be en incu rred.

1.1.4 Test leads mu st be kep t in good c ondit ion. Be fore
using check w hethe r the ins ulati on on tes t leads h as been
damaged and any wire h as been e xpose d.

1.1.5 Use the t est lea ds supp lied to e nsure o perat ion
safety. If requi red, th ey must b e repla ced wit h test le ads
of the same mod el or cla ss.

1.2 During Use

1.2.1 Use the r ight in put jac k, func tion an d range .

1.2.2 Do not ta ke meas ureme nts tha t excee d the
protectio n limit v alues i ndica ted in th e speci ficat ions.

1.2.3 Do not to uch the m etal ti ps of the t est lea ds when
the meter is co nnect ed to the c ircui t to be mea sured .

1.2.4 Keep yo ur fing ers beh ind the p robe ba rrier s when
taking a meas ureme nt with a n effecti ve volt age abo ve
60V DC or 30V rms AC .

1.2.5 Do not ta ke volt age mea surem ent if th e value
between the t ermin als and e arth gr ound ex ceeds 6 00V.

1.2.6 Selec t the hig hest ra nge if th e value s cale to b e
measured in t he manu al rang e is unkn own.

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 t ake cap acita nce mea surem ents un til the
capacitor t o be meas ured ha s been fu lly dis charg ed.

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.

WARNING

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.

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 unle ss 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.

03 04

1.3 Symbols

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. Discon nect the test le ads fr om all sou rces
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 immedi ately when the “ ” sign

appears on th e displ ay.

1.4.4 Use dam p cloth a nd mild d eterg ent to cl ean the
meter; do not u se abra sives o r solve nts.

1.4.5 Turn the r otary s elect or to OFF p ositi on to swi tch
off the power whe n the met er is not i n use.

1.4.6 Remov e the bat terie s to avoi d damag es to the
meter if it wil l idle fo r a long ti me.

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.

Note-Impo rtant s afety i nform ation , refer t o the
instructi on manu al.

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 Euro pean (E U) safe ty stan dards

Earth (grou nd) TERMI NAL

Caution, po ssibi lity of e lectr ic shoc k

Equipment protec ted thr ougho ut by dou ble
insulatio n or rein force d insul ation .

Application around and removal from UNINSULATED
HAZARDOUS LIVE conductors is permitted.

Direct curr ent

Alternatin g curre nt

CAT II I : M EASU REME N T CATEG ORY II I i s a ppli c able to
te s t a nd meas uring c i rcui t s conne cted to th e d istri buti o n
par t o f t he buil ding ' s l ow-v oltag e M AINS in stall atio n .

05 06

2.1 Names Of Components

(1) Current C lamp
(2) Clamp Lighting B ulb
(3) Panel
(4) Trigger
(5) Functio n Switc h Butto n (S E L)
(6) MAX/MIN S witch B utton ( MAX/M IN)
(7) Auto/Man ual Swi tch But ton (RA N)
(8) Liquid Crystal D ispla y (LCD)
(9) COM Jack
(10) Input Ja ck
(11) Hz/Duty Swi tch But ton (Hz /%)
(12) Reading Hold/ Back Li ght But ton (HO LD/B. L)
(13) Rotary s elect or
(14) OFF - powe r switc h
(15) “+” Symb ol
(16) “-” Symb ol
(17) Rear Cas e
(18) Fixing S crew of B atter y Cover
(19) Batter y Cover
(20) Protec tive Ba rrier ( to warn t he oper ator of t he limi t of
safe a ccess )

- 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.

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ACCORD WITH:
IEC 61010- 2-032
IEC 61010-2 -033

CAUTION

IEC 61010-1

600V CAT III

20

07 08

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 di spl ay)

AC

Alternating current

Direct current

Diode test

Continuity buzzer

Auto range mode

Manual range mode

The minimum value is being measured.

The maximum value is being measured.

AUTO

MANU

MAX

MIN

DC

ZERO

TRMS

H

INRUSH

%

mV, V

A

Ω, kΩ,
MΩ

Hz, kHz

μF, mF

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)

Hz

AUTO

MANU

MAX MIN

ZERO

°C°F%

μmVA

nμmF

MkΩ

INRU SH

TRMS

09 10

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 Specificatio ns

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 Specif ica tio ns

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.

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 Cur rent

±(3.0% of rdg + 10 digits)

Accuracy

Resolutio n

0.01A

0.1A

Range

66A

600A

- Max. input cu rrent : 600A

- Frequency r ange: 4 0 to 400H z

- Response: t rue roo t mean sq uare va lue

3.2.3 Inrus h Curre nt

±(10.0% of rdg + 60 digits)

Accuracy

<60A take it only as refe rance

Resolutio n

0.01A

0.1A

Range

66A

600A

- Integrati on Time: 1 00ms

- Measureme nt rang e: 30 ~ 600 A

- Max. input cu rrent : 600A

- Frequency r ange: 4 0 to 400H z

- Response: t rue roo t mean sq uare va lue

11 12

3.2.4 DC Curr ent

- Max. input cu rrent : 600A DC

±(3.0% of rdg + 10 digits)

Accuracy

Resolutio n

0.01A

0.1A

Range

66A

600A

3.2.5 DC Voltage

±(0.8% of rdg + 3digits)

Accuracy

Resolutio n

0.1mV

0.001V

Range

660mV

6.6V

0.01V

66V

- Input imped ance: 1 0MΩ

- Max. input vo ltage : 600V DC

±(1. 0% of rdg + 5digits)

0.1V

600V

Note:

At small volt age ran ge, uns teady r eadin gs will a ppear
before the te st lead s conta ct the ci rcuit . Th is is nor mal
because the m eter is h ighly s ensit ive. Wh en the te st
leads conta ct the ci rcuit , the tru e readi ng will b e shown .

3.2.6 AC Voltag e

±(1.2% of rdg + 5digits)

Accuracy

Resolutio n

0.1mV

0.001V

Range

660mV

6.6V

0.01V

66V

0.1V

600V

±(1.5% of rdg + 10digits)

±(1.5% of rdg + 10digits)

- Input imped ance: 1 0MΩ

- Max. input vo ltage : 600V Tru e RMS AC

- Frequency r ange: 4 0 to 400H z

- Response: t rue roo t mean sq uare va lue

Note:

At small volt age ran ge, uns teady r eadin gs will a ppear
before the te st lead s conta ct the ci rcuit . Th is is nor mal
because the m eter is h ighly s ensit ive. Wh en the te st
leads conta ct the ci rcuit , the tru e readi ng will b e shown .

3.2.7 Frequ ency

3.2.7.1 By A range ( from curre nt clam p):

±(1.5% of rdg + 5 d igits )

Accuracy

Resolutio n

0.1Hz

Range

660Hz

1kHz

0.0011Hz

0.0011Hz

>1kHz

Take it only as referance

- Measureme nt rang e: 10 ~ 1kH z

- Input curre nt rang e: >10A Tru e RMS AC (hi gher in put
current at hi gher fr equen cy)

- Max. Input cu rrent : 600A True R MS AC