Mastech MS8250D User Manual
MS8250D
DUAL DISPLAY
DIGITA L M U LT I M E T E R
User’s Manual
Warning
01 02
1. Safety Information
Use caut io n an d follow all safety guidelines to
preven t el ec tric shock or damage to the meter.
Please r ea dy c arefully all instructions b ef or e use.
Instru me nt m eets GB/T 13 978-92 concerning digital
multim et er s tandards, along with G4B793 .1 -1 995
(IEC-6 10 10 -1,IEC-61010-2-032)sa fe ty s tandards or
electr ic al m easuring instruments with a n ov er-voltage
catego ry o f CAT IV 600V,C AT III 1000V.
Follow a ll s afety instructions to ensure sa fe u se a nd long
life of th e in st rument.
1.1 Prepara tion
1.1.1 Wh en u si ng the meter, follow all standar d sa fe ty
guidel in es :
- For univ er sa l protection again electric s ho ck .
- To preven t th e mi suse of the instrument.
1.1.2 Ch ec k th e meter for damage during trans it .
1.1.3 Test leads must be i n go od c ondition.Check the
insula ti on a nd tips before use.
1.1.4 Sa fe ty c an only be guaranteed with lead s pr ov ided.
If leads n ee d to b e replaced, they must be replac ed
with lea ds o f sa me electrical specificati on s.
1.2 Using the M eter
1.2.1 Alw ay s se t the meter to the proper functio n an d
range fi rs t.
1.2.2 Ne ve r ex ceed protection limits indi ca te d for each
measur em en t.
1.2.3 Ke ep f in gers behind the probe barrier s wh ile
measur in g.
1.2.4 Alw ay s be c areful when working with volt ag es
above 60 V DC o r 30 V AC RMS.
1.2.5 Ne ve r me asure voltages that might exc ee d 60 0V
DC/AC ab ov e ea rth ground.
1.2.6 In m an ua l range, if the circuit value is un kn ow n,
start th e me te r at the maximum range and then
adjust a cc or dingly.
1.2.7 Re mo ve t he leads from the circuit first b ef or e
switch in g be tween functions.
1.2.8 Do n ot p ow er on circuit while measuring r es istance,
capaci ta nc e, diodes and continuity.
1.2.9 Ne ve r co nnect the meter ’s l ea ds across a voltage
source w hi le t he rotary switch is in the resist an ce ,
capaci ta nc e, diode or continuity mode.
1.2.10 D o no t me asure capacitance before ca pa citors
are disc ha rg ed.
1.2.11 Do not operate t he m et er near explosive gas,
vapor or d us t.
1.2.12 S to p us ing the meter if any abnormalit y is o bs erved.
1.2.13 D o no t us e the meter unless the battery co ve r is
secure ly f as tened to the meter.
1.2.14 Avoid direct e xp os ure to sunlight to ensure
extend ed l if e of the meter.
03 04
1.3 Safety Sy mbols
1.4 Mainten ance
1.4.1 To avoid electri c sh oc k or personal injury, repairs/
servic in g no t covered in this manual should b e
perfor me d on ly by qualified personnel.
1.4.2 Re mo ve t est leads from any circuit befo re o pe ning
batter y co ve r.
1.4.3 To avoid false rea di ng s that may become
danger ou s, r eplace the battery as soon as the
ymbol ap pe ar s.
1.4.4 Cl ea n th e meter using a damp cloth and mild
deterg en t on ly; do not use abrasives or chemi ca l
solven ts .
1.4.5 Alw ay s mo ve rotary switch to OFF when not us in g
the mete r.
1.4.6 If m et er i s not going to be used for an extende d
period o f ti me , remove battery to prevent damag e
to the met er.
2. Description
-The MS8 25 0D i s a portable, hand-held yet pro fe ss ional
meter th at f ea tures True RMS measurement dis pl ay,
AC/DC cur re nt , AC/DC voltage, Frequency,
Capaci ta nc e, Resistance, Continuity, Duty Ratio, D io de
Testing a nd a U SB adapter for recording read in gs o n a
PC. This Meter is easy t o us e ev en with one hand, s
uitabl e fo r pr ofessional users or amateur s, a nd i deal for
school o r ho me u se.
- Both aut o an d ma nual range.
- Displa y ho ld
- True RMS fo r AC vo lt age/current measurement s
- Relati ve m ea surement
- Maximu m me as urement
- Minimu m me as urement
- Displa y fr eq uency when measuring AC voltag e/ current
- Automat ic P ow er Off
Import an t sa fety information, please re fe r
to user’s manual
Cautio n wh en testing on live conductors
Double i ns ulation protection (categor y II )
This met er h as m et IEC61010-1 standard
with an ov er vo ltage category (600V CAT IV)
and poll ut ion degree 2.
CAT IV
Double i ns ulation protection (categor y II )
Ground
2.1 Part Name
(1)
(2)
(3)
(4)
(5)
(6)
(7)
USB inte rf ac e
NCV dete ct io n indicator
LCD disp la y
Functi on b ut tons
Rotary s wi tc h
Input so ck et s
NCV dete ct io n sensor
Compli es w ith U.S. and Canadian safety
standa rd s
05 0 6
2.2 2 Buttons /Input jack desc ription
HOLD: ke ep c ur rent reading on the display
FUNC: sw it ch b etween functions or AC/DC meas ur ement
RANGE: s wi tc h between auto/manual range s
REL: dis pl ay r elative measurement
MAX/MI N: s wi tch between max/min measure me nt d isplay
:turn on /o ff backl ig ht
OFF:Po we r off posi ti on
:input j ac k fo r voltage, resistance, capa ci ta nce,
diode, c on ti nuity, fr eq uency and duty cycle
measur em en t
:commo n te rm inal
: input ja ck f or c urrent measurement (<660m A)
:input j ac k fo r current measurement (<10A )
COM
μAmA
10A
V
Hz%
2.3 LCD displ ay
1
2
4
5
6
3
7
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