Mastech MS2128A Operation Manual

MS2128A

DIGITAL CLAMP METER

OPERATION MANUAL

CAT III

600V

400A

REL

1.1 Preliminary

1.2 During use

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

CONTENTS CONTENTS

1. Safety Information

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

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

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

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

4

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

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

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

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

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

................16

....................................16

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

..............................17

....

..

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

2. Description

...........................................

2.1 Names OF Parts

...................................5

2.2 Switch, Buttons And Input Jacks

2.3

3. Specifications

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

4. Operation Instruction

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

3.1 General Specifications

3.2 Technical Specifications

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

4.1 Holding Readings

4.2 Switching Rel

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 Dc Current

4.11 Measuring Ac Voltage

4.12 Measuring Dc Voltage

......................18

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

..............................20

..............................22

..............................24

..............................26

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

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

..........................................35

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

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

.......17

4.13 Measuring Frequency

4.14 Measuring Duty

4.15 Measuring Resistance

4.16 Testing Diode

4.17 Testing Continuity

4.18 Measuring Capacitance

5. Maintenance

...........................................41

.............................41

5.1 Replacing The Batteries

5.2 Replacing Test leads

.................................43

6. Accessories

............................................43

LCD (Liquid-Crystal Display)

01 02

1. Safety Information

With p roper use a nd care, th is digita l multime ter will gi ve
you ye ars of sati sfactor y 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 kep t in good condition. Before
using check whether the insulation on tes t leads has
been damaged and any wire has been exposed.

1.1.5 Use the test leads supplied to en su re operati on
safety. If required, they must be replaced with test
leads of the same mod el or class.

1.2 During Use

1.2. 1 Use the rig ht input ja ck, funct ion and ran ge.

1.2. 2 Do not take m easurem ents that e xceed the
prot ection li mit value s indicat ed in the
spec ificati ons.

1.2. 3 Do not touc h the metal t ips of the te st leads wh en
the me ter is conn ected to th e circuit t o be
meas ured.

1.2. 4 Keep your f ingers be hind the pr obe barri ers when
taki ng a measur ement wit h an effective voltage
abov e 60V DC or 30V r ms AC.

1.2. 5 Do not take v oltage me asureme nt if the val ue
betw een the ter minals an d earth gro und excee ds
600V.

1.2. 6 Select th e highest r ange if the v alue scal e to be
meas ured in the m anual ran ge is unkno wn.

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 tak e capacit ance meas urement s until the
capa citor to be m easured h as been ful ly
disc harged.

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 ga se s, steam
or dirt.

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

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. 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
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).

1.2. 13 Do not use t he meter un less its re ar case and
batt ery cover i s securel y fastene d in its orig inal
posi tion.

1.2. 14 Do not sto re or use the m eter in are as expose d to
dire ct sunlig ht, at high t emperat ure or with h igh
rela tive humi dity.

Note -Import ant safet y informa tion, ref er to the
inst ruction m anual.

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

Comp lies with E uropean ( EU) safet y standar ds

Eart h (ground ) TE RMINAL

Caut ion, poss ibility o f electri c shock

Equi pment pro tected th roughou t by double
insu lation or r einforc ed insula tion.

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

Dire ct curren t

Alter nating cu rrent

CAT III : MEASU REMEN T CATEGORY III is ap plica ble to
test and me asuri ng circ uits connected to t he dist ribut ion
part of the b uildi ng's low-voltage MAINS i nstal latio n.

1.4. 1 Do not atte mpt to remo ve the rear c ase to adju st or
repa ir the mete r. Such acti ons shoul d only be
perf ormed by a te chnicia n who fully u ndersta nds
the me ter and the d anger inv olved.

05 06

2.1 Names Of Components

(1) Cu rr en t Clamp
(2) Cl am p Li ghting Bulb
(3) Pa ne l
(4) Tri gg er
(5) Fu nc ti on Switch Butto n (S E L )
(6) MA X/ MI N Switch Button ( MA X/MIN)
(7) Re la ti ve Switch Butto n (R EL)
(8) Li qu id C rystal Displa y (L CD)
(9) CO M Ja ck
(10) I np ut J ack
(11) Hz/Duty Sw it ch Button (Hz/%)
(12) R ea di ng Hold/Back Li gh t Button (HOLD/B. L)
(13) R ot ar y selector
(14) O FF - p ow er switch
(15) “ +” S ym bol
(16) “ -” S ym bol
(17) R ea r Ca se
(18) F ix in g Screw of Batter y Co ver
(19) B at te ry Cover
(20) P ro te ctive Barrier ( to w arn the operator of t he l imit of
safe acc es s)

- 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.

- 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.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

18

17

19

16

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

CAUTION

IEC 61010-1

600V CAT III

20

400A

REL

07 08

2.2 Switch, Buttons And Inpu t Jacks

HOLD/B.L Button

- For holding the reading or control backlight
S E L Button

- For switching among measuring functions
REL Button

- The key is the relative value measurement.
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 displa y)

AC

Alternating current

Direct current

Diode test

Continuity buzzer

Auto range mode

The minimum value is being measured.

The mimum value is being measured.

AUTO

MAX

MIN

DC

REL

H

%

mV, V

A

Ω, kΩ,
MΩ

Hz, kH z

nF,μF

Auto power off

Battery low

This indicates that the display data is
being held.

Percent (Duty cycle)

Milli-volts, Volts (Voltage)

Amperes (Current)

Nanofarad, Microfarad

Ohms, Kilo-ohms, Mega-ohms
(Resistance)

Hertz, Kilo-hertz (Frequency), Milohertz

DCA zero and relative measure

40

3020100

MkΩ

Hz

mVA

nμF

%

MAX MIN

REL

09 10

3. Specifications

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

3.1 General Specifications

3.1.1 Auto range.

3.1.2 Over range protection is provided for all ranges.

3.1.3 Maximum voltage between terminals and earth
ground: 600V DC or 600 rms AC

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

3.1.5 Display: 4000 counts with analog bar LCD display

3.1.6 Maximum value display: 4000 digits

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

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

3.1.9 Converter Rate: 3 times/sec; Bar graph: 30 times/sec.

3.1.10 Unit indication: function and unit.

3.1.11 Auto power off time: 15 minute.

3.1.12 Operating power : 3× 1.5V 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 AC Current

±(2.0% of rdg + 6 digits)

Accu racy

Reso lution

0.01 A

0.1A

Rang e

40A

400A

- Max. i nput curr ent: 400A AC

- Freq uency ran ge: 40 to 400 Hz

- Resp onse: Averag e value

3.2. 2 DC Curren t

- Max. i nput curr ent: 400A DC

±(2.0% of rdg + 6 digits)

Accu racy

Reso lution

0.01 A

0.1A

Rang e

40A

400A

3.2. 3 DC Voltage

Accu racy

Reso lution

0.1m V

0.00 1V

Rang e

400m V

4V

0.01 V

40V

±(1. 0% of r dg + 2d igits)

0.1V

400V

±(0. 7% of r dg + 2d igits)

- Inpu t impedan ce: 10MΩ

- Max. i nput volt age: 600V D C

1V

600V

±(0. 8% of r dg + 2d igits)

11 12

3.2. 4 AC Voltage

Accu racy

Reso lution

0.00 1V

0.01 V

Rang e

4V

40V

0.1V

40 0V

1V

600V

±(0. 8% of r dg + 3d igits)

±(1% of rdg + 4digi ts)

- Inpu t impedan ce: 10MΩ

- Max. i nput volt age: 600V r ms AC

- Freq uency ran ge: 40 to 400 Hz

- Resp onse: Averag e value

3.2. 5 Frequen cy

3.2. 5.1 By A range ( f rom curre nt clamp) :

±(1. 5% of r dg + 5 digits)

Accu racy

Reso lution

0.1H z

Rang e

10Hz

1kHz

0.00 11k Hz

0.00 11k Hz

>1kH z

- Meas urement r ange: 10 ~ 1k Hz

- Inpu t current r ange: >40 A rms AC (highe r input
curr ent at high er freque ncy)

- Max. I nput curr ent: 400A rm s AC

Note:

At sma ll voltag e range, un steady re adings wi ll appear
befo re the test l eads cont act the cir cuit. This is normal
beca use the met er is highl y sensiti ve. When th e test
lead s contact t he circui t, the true r eading wi ll be shown .

3.2. 5.2 By ACV ran ge:

Accu racy

Reso lution

0.01 Hz

0.00 1kHz

Rang e

10Hz

1kHz

0.01 kHz 10 kHz

>10k Hz

±(1. 5% of r dg + 5 digits)

- Meas urement r ange: 10 ~ 10 kHz

- Inpu t voltage r ange:>0 .6V rms AC (hi gher inpu t
volt age at high er freque ncy)

- Inpu t impedan ce: 10MΩ

- Max. i nput volt age: 600V r ms

0.01 kHz

3.2. 5.3 By Hz/D UTY range

Accu racy

Reso lution

0.00 1Hz

0.01 Hz

Rang e

9.99 9Hz

99.9 9Hz

0.1H z 999.9Hz

9.99 9kHz

±(0. 5% of r dg + 3 digits)

- MAX. I nput volt age:600 V AC (rms)

0.00 1kHz

99.9 9kHz

999. 9kHz

9.99 9MHz 0.00 1MHz

0.1k Hz

0.01 kHz

Take i t only as refe rance

Take i t only as refe rance