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MS8301D
NCV
AUTO
kHz%
MI N
MAX
V
MS8303D
Digital Multimeter
User’s Manual
DIGITAL MULTIMETER
MA X
FUNC
COM
/
600V CAT III
MAX 600V
MI N
NCV
V
Hz%
V Hz%
CONTENTS
Overview.. ............................... .........1
Safety Inst ructions.... ........................2
Safe Working Habits..........................2
Electric Sy mbols....... ................... .....4
Meter Instr uctions..... ........................5
Meter Appear ance........ ................5
Display............ ............ ................6
Keys Operat ion......... ................... .....7
Hold/Back light Key............... .........7
FUNC Key(se lect).........................7
MAX/MIN Key.......... ............ ..........7
NCV Key.............. ............ .............7
Automatic Po wer-Off Function.........8
Measuring O peration.... .....................8
SMART Function Measurement.......8
AC/DC Voltage M easurement.. ........8
Resistanc e Measurement. ..............9
30 809 12
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CONTENTS
Here are some t ips for measurin g resistance.. 9
Continuit y Measurement. ...........1 0
Frequency /Duty Cycle... ............10
Non-Conta ct Voltage (NCV). ...........11
General Spe cifications. ............ ...........11
Accuracy ln dicators.... .........................12
DC Voltage.. ............ ................... ...12
AC Voltage.. ............................... ...12
Resistanc e........... ................... ......13
Continuit y Measurement .. ..............13
Frequency...................... ............ ...13
Duty Ratio. ............................... .....14
Maintenan ce.......... .............................14
General Mai ntenance.... .................14
Replacing The Batteries.................15
Replace tes t leads....... ..................15
Overview
To avoid ele ct ric shock or person al i njury, ple as e
read “safety in fo rm ation” and “war ni ng and
related notes ” ca re fully before us in g th e meter.
The special att en ti on should be paid w he n us ing
the meter becau se t he i mproper usage m ay c au se
electric shoc k an d da mage the meter .
The safety meas ur es i n common safety
regulations a nd o pe rating instru ct io n should be
complied with w he n us ing.
In order to make fu ll u se o f its functions a nd
ensure safe ope ra ti ons please comp ly w it h the
usage in this sec ti on c arefully.
This mete r is a small hand -held, safe a nd reliab le 3 .5"
digital a ut o measuri ng range mult i- meter wit h stable
perform an ce and nove l structure . It can be used to
measure AC /DC voltage , resistanc e, frequenc y, duty ra ti o,
continu it y and non-c on tact volt ag e tests. It i s an ideal
mainten an ce tool eas il y carried b y a large numbe r of
users.
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Safety Instructions
This digi ta l multi-m et er has been d esigned
accordi ng t o Interna ti onal Elec tr o Safety St andard
EN 61010- 1, EN 61010-2 -030, EN 6101 0-2-033
concern in g safety re qu irement s fo r electro ni c
measuri ng i nstrume nt sand hand -h eld digit al
multi-m et ers. It mee ts the requir ements for CAT lIl
600V of EN 61 010-1. EN 610 10-2-030,
EN 61010- 2- 033 and gra de 2 for pollut ion.
Users sho ul d use the met er strictly a ccording to t he
provisi on s of this man ual. Otherw ise, the warr anty
for the met er may become i nvalid.
The warni ng s in the user m anual are use d to remind
users of po ssible dang er or dangero us action.
The notes i n the user manu al are used t o re mind
users of po ssible mete r damage or con dition or
action of m easured obj ect.
Safe Working Habits
To avoid poss ible electr ic shock or p er sonal inj ur y as
well as dam ag e to the mete r or measur ed o bjects,
please us e the meter acc ording to the f ollowing
procedu re s methods :
Check the c ase before us ing the meter. D on't use th e
meter wit h damaged cas e. Check to see i f the case is
cracked o r lacks plast ic parts. Ple ase pay speci al
attenti on t o the joint i nsulating l ayer.
Check to se e if the test wir e has insul at ion damag e or
bare meta l. Check test w ire continu ity. If th e wire is
damaged , pl ease repl ac e it with a new o ne before
using the m eter.
Measure k no wn voltag e wi th the mete r to verify tha t
the meter i s working pro perly. If the meter is wo rking
abnorma ll y, stop us ing it imme di ately. A prote ct ive
device ma y be damaged. I f there is an y do ubt, plea se
have the me ter inspect ed by a qualifi ed technici an.
Do not test v oltage exce eding rated v oltage mark ed
on the mete r.
When test in g voltage e xceeding 30 V AC voltage RMS ,
42V AC peak or 6 0V DC, be par ti cularly c ar eful to
avoid ele ct ric shock .
When meas ur ing, use co rrect jack, a nd select the
proper fu nc tion and me asuring ran ge .
Do not use th e meter in ex pl osive gas , va por or dust y
environ me nts.
When usin g the probe, fi ngers shoul d be behind the
probe pro te ction dev ic e.
Before me as uring res is tance, co nt inuity,
first tur n off pow er a nd discha rg e all high vo ltage
capacit or s.
If the mete r is not used i n ac cordanc e wi th the
instruc ti ons, the me te r's safet y protectiv e function
may becom e invalid.
When open in g the case (o r part of the c as e), turn
the meter o ff.
When the ba ttery low vol tage indica tor " "
becomes l it , replace t he battery at o nce. A low
battery w il l cause met er reading er rors and may
result in e lectric sho ck or persona l injury.
Before op en ing the cas e or the batter y cover,
remove th e test wire fro m the meter.
When main ta ining the m eter, use repl acement par ts
specifi ed b y the facto ry.
0302
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NCV
AUTO
kHz%
MI N
MAX
V
Measure known volta ge w it h the meter to verify
that the meter is worki ng p ro perly. If the me te r
is working abnormal ly, stop using it imme di at el y.
A protective device ma y be d am ag ed.
If there is any doubt, pl ea se h av e the meter
inspected by a qualif ie d te chnician.
Electric Symbols
Important safety information. Read the manual.
High voltage with danger.
Ground.
Double Insulation (Class II safety equipment).
Accor d with th e relat ed EU laws and regulations
AC voltage
DC Voltage
CONFORMS TO UL STD 6 10 10 -1, 61010-2-030
and 61010-2-033, CE RTIFIED TO CSA STD
C22. 2 NO. 61010-1, 610 10 -2 -0 30 and
3080 912
61010-2-033
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.
Mete r Instructions
Meter App ea ra nc e
(1) LCD display
(2) NCV key
(3) MAX/MIN Key
(4) FUNC Key
(5) Data hold /ba ck li ght key
(6) Rotary swit ch
FUNC
COM
DIGITAL MULTIMETER
MAX
/
MIN
V
V Hz%
600V CAT III
MAX 600V
NCV
Hz%
0504
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NCV
AUTO
kHz%
M I N
MAX
V
(7) All common inp ut j ac ks for measurin g (c on nected
with the black te st p ro be).
(8) Positive in pu t ja ck of voltage, re si st ance,
frequency/d ut y ra tio, and contin ui ty ( connected
with the red test p ro be )
Display
(1)Direct vol ta ge i ndicator
(2) Numerical v al ue p olarity indic at or ( negative sign )
(3) Alternatin g vo lt age indicator
(4)Battery lo w- vo ltage indicat or
(5)Automati c me as uring range ind ic at or
(6) Data hold ind ic at or
(7) Continuit y me as urement indic at or
(8) Measureme nt u ni t
(9) Measureme nt d is play value
Keys Operat ion
Hold/B ac klight Key
Press the key to ho ld t he r eading on the dis pl ay. Press the
key again to rele as e th e hold .Press the k ey f or 2 s econds
to turn on the back li gh t.Press the key f or 2 s ec onds again
to manually tur n off the backlig ht .
FUNC Key ( se lect)
Press the key to sw it ch b etween functi on s or b etween
AC/DC voltage .
MAX/MI N Ke y
Press the key to sh ow t he m axinum readin g va lu e
among measuri ng d at a, and the “MAX”s ym bo l appears
on the display, press the button ag ai n, the “MIN”
symbol appear s on t he d isplay and will s ho w th e
minimum readi ng v al ue among measur in g da ta, press
the button agai n to r et urn to normal mod e.
NCV Key
Press the key dow n in a ny m ode and the meter w il l
activate the no n- co ntact voltage d et ec tion. Hold the
meter up to a volta ge s ou rce and the buzze r wi ll s ound
and the NCV indic at or w ill light up if vol ta ge i s detected.
Release the “NC V” k ey t o stop NCV detect io n.
Automa ti c Power-Off Function
In the measurem en t pr ocess, if there i s no a ct ivity
by the function k ey o r fu nction select io n sw itch for
15 minutes, the m et er w ill automatic al ly s hutdown
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(sleep state) . Pr es s “ FUNC” key to powe r on a nd t he
automatic shu td ow n function will b e ca nc elled.
Measuring O peration
SMART Fu nc tion Measurement:
Move the rotary s wi tc h to the “SMART” po si ti on the
default mode is “ AC Voltage” “DC Voltage”
“Resistance ” or “ Co ntinuity”, co nn ec t the test leads
cross the circu t or l oa d to be measured, I t wi ll Au tomatic
judgement on th e di sp lay.
AC Voltage or DC Volt ag e, o r Continuity or R es is tance,
are measured si mu lt aneously.
AC/DC Voltage Mea su rement:
1
Rotate functi on s el ection switch t o vo lt age
measurement p os it ion.
2
Press “FUNC” ke y to s el ect AC or DC voltage
3
Connect black a nd r ed t est probe to COM in pu t
jack and respec ti ve ly.
4
Read the measur ed v al ue from LCD displ ay. When
measuring AC or DC voltage , th e di splay will
simultaneou sl y sh ow the voltage po la ri ty which is
connected wit h re d te st probe.
Don't measure a ny R MS v oltage higher t ha n
600V DC or AC, to prevent in ju ry o r damage to
meterand equi pm en t.
Resist an ce measurement:
1
Rotate functi on s el ection switch t o re si stance
measurement p os it ion, and turn off t he power to
the circuit to be t es te d
Connect black a nd r ed t est probe to COM in pu t
2
jack and respec ti ve ly.
Measure the res is ta nce of circuit to b e te st ed with
3
other ends of tes t pr ob es.
Read the resist an ce v alue from LCD dis pl ay. If it
4
is overload, “O L” w il l display on the LC D di sp lay
Here are s om e tips for measuring resi st ance:
The resistanc e me as ured on a circuit i s us ua lly
differe nt f rom the rated value o f re sistance. Thi s is
because the tes t cu rr ent of the meter wi ll f lo w through
all possible ch an ne ls between test p ro be s.
When measurin g lo w re sistance, to en su re a ccuracy,
make a short circ ui t be tween the test pr ob es a nd
read the resist an ce v alue of the short c ir cu it. This
resistance va lu e sh ould be subtrac te d af ter measuring
the resistanc e to b e te sted.
When there is no in pu t (f or example, ope n ci rc uit),
the display wil l sh ow “ OL”, which mean s th at t he
measured valu e is o ut o f range.
When measurin g re si stance or circu it c on tinuity,
to avoid injury o r me te r damage, turn of f th e
power to the circ ui t an d discharge all c ap acitors.
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Contin ui ty Measurement:
Rotate functi on s el ection switch t o co nt inuity
1
measurement p os it ion, and turn off t he power to
the circuit to be t es te d
Connect black a nd r ed t est probe to COM in pu t
2
jack and respec ti ve ly.
3
Measure the cir cu it t o be tested with ot he r en ds
of test probes.
4
If the measured c ir cu it resistance i s le ss t han
about 40Ω, the bu zz er w ill sound conti nu ou sly.
When measurin g re si stance or circu it c on tinuity,
to avoid injury o r me te r damage, turn of f th e
power to the circ ui t to be measured and
discharge all c ap ac itors.
Frequency/D ut y Cy cle
Insert the red te st l ea d in the “INPUT” ja ck a nd t he
1
black lead in the “ CO M” j ack.
2
Move the rotary s wi tc h to the “Hz%” posi ti on .
Connect the tes t le ad s across the circ ui t to b e
measured.
3
Read measured f re qu ency on the displ ay.
4
Read measured d ut y cy cle on the displa y.
Non-Contact Voltage (NCV)
Hold down the “NC V” k ey a nd move the tip of th e cl am p
toward the cond uc to r under test. If th e de te cted voltage
is ≥ 110V AC (rms ), t he NCV indicator wi ll f lash and the
buzzer will bee p.
Note
1)Do not rely sol el y on N CV detection to d et er mine
the presence of v ol ta ge. Detection c an b e affected
by socket desig n, i ns ulation thick ne ss , or other factor s.
2)lnterfere nc e fr om outside sour ce s co uld accidenta ll y
trigger the NCV d et ec tor.
General Spe cifications
Operating env ir on ment and condit io n: 6 00V CAT lI l,
pollution gra de : lI .
Elevation < 200 0 m
Environment t em pe rature and humi di ty : 0~40°C,
<80% RH (do not use m et er w hen temperatu re < 10 °C).
Storage tempe ra tu re and humidity : -1 0~ 60°C,
<70% RH (remove t he b at tery).
Temperature coe fficient: 0.1 xA cc uracy/°C
(<18°C or >28°C ).
The maximum all ow ab le voltage betw ee n
measurement e nd a nd g round: 600V DC or 6 00 V
AC RMS.
Sampling rate : ab ou t 3 times/s.
Display: 3 5/6 bi ts o f di git LCD display.
Over-range in di ca tion: LCD will sh ow “ OL ”.
Low battery ind ic at ion: When the bat te ry v oltage
is lower than the n or ma l operating vol ta ge , “ ”
will display on t he L CD d isplay.
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Input polarit y in di cation: autom at ic ally display "- "
symbol.
Power supply: AA A 1.5 Vx 2 batteries.
Dimension(L xW xH ): 150x74x48m m
Weight: a bo ut 230g.
Accura cy I ndicators
Accuracy: ±(% o f re ad ing + digits) wit h on e ye ar of
warranty.
Reference con di ti ons: environm en ta l
temperature i s fr om 1 8°C~28°C, rel at iv e humidity
is not more than 80 %.
DC Voltage
Measuring range
6V
60V
600V
Input impedan ce : 10 MΩ
Maximum input v ol ta ge: 600V DC or AC (RMS )
Measuring ran ge : 1V ~600V DC
Max input volta ge : up t o 600V for no more th an 6 0 se conds.
Resolution
0.01V
0.1V
1V
±(0.5% of readi ng +3 d igits)
Accuracy
AC Voltage
Measuring range
6V
60V
600V
Input impedan ce : 10 MΩ
Maximum input v ol ta ge: 600V DC or AC (RMS )
Measuring ran ge : 1V ~600V AC
Max input volta ge : up t o 600V for no more th an 6 0 se conds.
Frequency res po ns e:45Hz~65Hz
Resolution
0.01V
0.1V
1V
±(0.8% of readi ng +5 d igits)
Accuracy
Resist an ce
Measuring range
2KΩ
20KΩ
200KΩ
2MΩ
10MΩ
Overload prot ec ti on:600V DC or AC (RMS)
Measuring ran ge : 0Ω ~10MΩ
Resolution
0.001KΩ
0.01KΩ
0.01KΩ
0.001MΩ
0.01MΩ
±(0.8% of readi ng +3 d igits)
±(1.0% of readi ng +5 d igits)
Accuracy
Continuity Measurement
Function
- Open circuit vo lt ag e: approx. 0.4V
- Overload prot ec ti on: 600V DC or AC (RMS )
- Measuring ran ge : 0Ω ~10MΩ
Measuring
range
When built-in buzzer
sounds, the resistance to
be tested is less than 40Ω
Resolution
Accuracy
Open circuit voltage:
about 0.4V
Frequency
Through grade HZ/DUTY:
Measuring range
60Hz
600Hz
3kHz
- Overload prot ec ti on:600V AC RMS
- The input v ol tage range:≥2V (i np ut v oltage will inc re as e
when the freque nc y to b e measured incr ea se s).
Resolution
0.1Hz
1Hz
10Hz
±(1.0% of readi ng +5 d igits)
1312
Accuracy
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Duty Ratio
Measuring range
10%~90% 1% ±2%
Throu gh grade HZ/DUTY:
- Frequ ency re sponse: 40~3K Hz
- The i nput vo ltage range: ≥2V AC RMS (i nput vo ltage will
incre ase whe n the fre quency to be mea sured inc rease s)
- Maxim um inpu t voltage:600V AC RMS
Resolution
Accuracy
Maintenan ce
This section pr ov id es basic mainte na nc e information ,
including ins tr uc tions for the bat te ry. Do not try to re pa ir
the meter unles s yo u ar e an experience d ma in tenance
person with the r el ev ant calibrati on , pe rformance tes ti ng
and maintenan ce d at a.
General Mai ntenance
To avoid inj ur y or damage to the me te r, do n't wet
the inner parts o f th e me ter. Before open in g the
case or battery c ov er, r emove the conne ct in g
cable between t he t es t probe and the inp ut s ignal.
Regularly cle an t he m eter case with da mp c lo th and a small
amount of deter ge nt . Do not use abrasi ve s or c hemical
solvents. If th e in pu t jack becomes di rt y or w et, it may
affect th e me asurement readi ng s.
To clean input sock et :
Turn off the m et er and pull out all the t es t probes
1
from the input ja ck .
Remove all dirt f ro m th e jacks.
2
Apply deter ge nt or lubrica nt t o a new cotton ba ll
3
(such as WD-4 0) .
4
Clean each ja ck w ith a cotton ba ll a nd lubrican t to
prevent con ta mination by m oi sture in the so ck et.
Replacing The Batteries
To avoid ele ct ric shock, make sur e th at t he test
leads have been c le ar ly move away from t he c ir cuit
under measure me nt b efore opening t he b at tery
cover of the mete r.
Do not mix old and ne w ba tteries. Do not mix
alkaline, sta nd ar d (carbon-zin c) , or rechargeable
(ni-cad, ni-m h, e tc ) batteries.
If the sign “ ” app ea rs, it means th at t he b atteries
should be rep la ce d.
Loosen the fi xi ng screw of the bat te ry cover and remo ve i t.
Replace the e xh au sted batter ie s with new ones.
Put the batte ry c over back and fix i t ag ain to its orig in f or m.
Note:
Do not reverse th e po le s of the batterie s.
Replace test leads
Replace test le ad s if l eads become dam ag ed o r worn.
Use meet EN 61010-031 standard, rated CAT III 600V,
10A or better test leads.
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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.
16
R-00-05- 2083
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