Mastech MS8251A Operation Manual
MS8251A
REL MAX MIN
%
AUTO
kHz
nmF
Hz
kM
C F
mVA
0 10 20 30 40 50 60 66
MS8251A
DIGITAL MULTIMETER
OPERATION MANUAL
CAT.III
1000 V
CAT.I V
600 V
01 02
1. Safety Information
1.2 Use
To reduc e the risk of elect ri cal shock, prod uct damage
or per sonal injury, please f ol low the safety in structions
desc ribed in the user m an ual. read the use r manual
befo re using the mete r.
This i nstrument mee ts G B/T 13 978-92 and
GB47 93.1-2007 (IE C- 61010-1,IEC -61010-2-03 2)
stan dards for safety re quirements fo r electronic te sting
inst ruments,pol lu tion degree 2,A nd over voltage r ating
of CAT III 1000V and CAT IV 600V.
Foll ow all safety ins tr uctions to ensu re safe use of the
inst rument.Prop er u se and protecti on of the meter wil l
ensu re long life of the m et er.
1.1 Preparation
1.1. 1
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1.1. 2
When u sing the meter, fo ll ow the followin g
safe ty r ules:
Alwa ys take precaut io n to prevent elec trical shock
Neve r misuse the inst ru ment
Chec k to see if the meter or an y components we re
dama ge d during shipme nt.
Chec k the meter and acc es sories thorou ghly
befo re u sing.
Insp ect test leads and pr obes for cracks , breaks or
craz es o n the insulatio n before using th e meter.
Use te st leads provid ed w ith the unit.If n ecessary,
repl ac e test leads with i dentical spec ifications.
1.1. 3
1.1. 4
1.1. 5
1.2. 1
1.2. 2
1.2. 3
1.2. 4
Turn the rotary sw it ch to the require d function and
rang e to b e measured.
When u sing the CAT Ⅳ en vi ronment, if the
meas ur ing voltage bet ween terminal s and earth
grou nd e xceeds 600V, CAT III envir onments or
volt ag e measurement b etween the term inal and
the ea rt h more than 1000V, do not measur e voltage.
Alwa ys be careful whe n wo rking with volt ages above
60V DC o r 30 V AC RMS. Keep finge rs behind the
prob e ba rriers while me asuring.Nev er touch probes
duri ng m easurement.
Choo se the highest ra ng e when the value to b e
meas ur ed is unknown.
1.2. 5 Remove test lea ds b efore switchi ng functions on
the ro ta ry switch.
1.2. 6 Do not perform re si stance, capac itance, diode a nd
cont in uity measurem ents on powered c ircuits.
1.2. 7 Never connect t he t est leads acros s a voltage
sour ce w hile the rotary s witch is in the res istance,
diod e or c ontinuity mod e. Doing so can dam age
the me te r.
1.2. 8 Po wer off the circuit and d ischarge capa citors
befo re t esting capaci tance.
1.2. 9 Do not place the me te r in any environm ent with
high p re ssure, high tem perature, dus t, explosive
gas or v ap or.
1.2. 10 Stop using the m et er if any failure o r abnormal
func ti on is observed.
1.2. 11 Do not u se m eter unless bat tery cover is in pl ace
a secu re d.
1.2. 12 Avoid dire ct sunlight, ex po sing batterie s to
humi di ty, any s trong magneti c field, or high
temp er atures to ensur e the extended li fe of the
mete r.
Warning
03 04
1.3 Mark
Note ( Im portant safet y information . Refer to
the op er ation manual)
CAT IV
Refe rs t o the impulse wit hstand voltag e protection
leve l in accordance w it h IEC-61010-1 s tandard
over vo ltage(insta llation)cat egory IV,po llution
degr ee 2
High Vo ltage
Comp liance with req ui rements for dou ble insulatio n
(Cat egory II)
1.4 Maintenance
solv en t or detergent.
1.4. 5 Wh en the instru me nt is not in use, tur n rotary switch
to “OF F” .
1.4. 6 If t he instrument i s not to be used for an e xtended
peri od o f time, remove th e batteries to pr event
dama ge t o the instrumen t.
2. Features and Components
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The MS 8251A is a portabl e, h and-held yet pr ofessional
mete r th at features an LC D with backligh t, overload
prot ec tion and low ba tt ery indicator. These m eters are
easy t o us e with one hand , su itable for prof essional
user s or a mateurs, and id eal for school or h ome use.
Func ti ons include : AC/ DC voltage, AC/D C current,
resi stance, capac it ance, continu ity, di ode test,
freq ue ncy and duty cy cl e.
Auto a nd manual range .
Auto p ower off.
Max me asurement.
Min me asurement.
Rela tive measurem en t
Read ing Hold functi on .
Average co mmutation
Simu ltaneously di sp lay frequency d uring AC voltage /
curr ent measureme nt s.
Non- contact volta ge t est
Mete r co mplies with E ur opean Communi ty (EU)
stan dards
Eart h Gr ound
2.1 Components
(1)
(2)
(3)
(4)
Non- contact volta ge d etection indi cator
LCD sc reen
Func ti on buttons
Rota ry switch
(5) In put sockets
(6) No n-contact vol ta ge sensor
1.4. 1 To avoid e lectric shock o r pe rsonal injury, repai rs
or ser vi cing not covere d in this manual sh ould be
perf or med only by quali fied personne l.
1.4. 2 Remove test lea ds b efore opening b attery cover
1.4. 3 To avoid i ncorrect read in gs causing elec tric shock
or per so nal injury,when low ba ttery symbol, “ ”
appe ar s, replace batt eries immedia tely.
1.4. 4 The me te r can be cleane d wi th a soft cloth to
remo ve a ny oil, grease or g rime. Do not use li quid
CAT III R ef ers to the impuls e withstand vol tage
prot ec tion level in acc ordance with IE C-61010-1
stan dard overvolt ag e(installat ion) category I II,
poll ut ion degree 2
Comp lies with U.S. an d Ca nadian safety s tandards
05 0 6
2.2 Buttons and Sy mbols
HOLD button: hold cu rr ent reading on sc reen.
FUNC b utton: switch b et ween function s.
RANG E button: switch be tween auto/ma nual ranges.
REL bu tton: relativ e re ading
MAX/ MI N button: switc h between maxim um/ minimum
read ings.
b
OFF po si tion:
COM
utto n: turn on/off backligh t.
EMP po si tion: thermoc ouple tempera ture measurem ent.
turn o ff met er.
Temp V Hz% jack :v oltage, curre nt, resistanc e,
capa citance, diod e, c ontinuity, frequen cy, dut y cycle,
temp erature input t er minal.
jack : co mmon input te rm inal.
µAmA jack: curre nt m easurements < 600mA.
10A jack: curren t me asurements >6 00mA to 10A.
2.3 LCD display
REL MAX MIN
%
AUTO
kHz
nmF
Hz
kM
C F
mVA
0 10 20 30 40 50 60 66
2
3
4
5
6
1
MS8251A
REL MAX MIN
%
AUTO
kHz
nmF
Hz
kM
C F
mVA
0 10 20 30 40 50 60 66
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