Instruction manual

Note:
Note:
Note:
Note:
ℕReadingispossibleatinputvoltagesabove3Vrms,butthe
accuracyisnotguaranteed.
ℕ
Innoisyenvironment,itispreferabletouseshieldcablefor
measuringsmallsignal.
B)
B)
B)
B)To
T o
To
Tomeasure
m easure
measure
measurefrequency
f requency
frequency
frequencyby
b y
by
byAC
A C
AC
ACVoltag
V oltag
Voltag
Voltage
e
e
e(or
( or
(or
(orAC
A C
AC
ACCurrent)
C urrent)
Current)
Current)
range
range
range
range
ℕ
Settherotaryswitchtothedesiredrange(ACVoltageor
ACCurrent).
ℕ
ConnecttheblackandredtestleadstotheCOM
C OM
COM
COMandV
V
V
V
(ormA
mA
mA
mA)terminalsrespectively.
ℕ
Connectthemetertothesignalsource;thenpressHz/%
key.
ℕFor5Vlogicsignals(TTL),usethe4Vdcrange.For12V
switchingsignalsinautomobiles,usethe40Vdcrange.
ℕReadthefrequencyoftheACsignalonthedisplay.
ℕ To makeadutycyclemeasurement,presstheHz
H z
Hz
Hz%
%
%
%
keyagain.
ℕ
Readthepercentofdutycycleonthedisplay.
Note:
Note:
Note:
Note:
ℕ
Ifthereadingis0.000Hzorisunstable,theinputsignalmay
bebelowornearthetriggerlevel.
Theseproblemscanfrequentlybefixedbyselectingalower
range,whichincreasesthesensitivityofthemeter.Inthe
DCVfunction,thelowerrangesalsohavelowertrigger
levels.
ℕ
Ifareadingseemstobeamultipleofwhatyouexpect,the
inputsignalmaybedistorted.
21
Distortioncancausemultipletriggeringofthefrequency
counter.Selectingahighervoltagerangemightsolvethis
problembydecreasingthesensitivityofthemeter.Also,try
selectingadcrange,whichraisesthetriggerlevel.In
general,thelowestfrequencydisplayedisthecorrectone.
3.2.
3 .2.
3.2.
3.2.8
8
8
8Current
C urrent
Current
Currentmeasurement
m easurement
measurement
measurement
To
To
To
Toavoid
avoid
avoid
avoiddamage
damage
damage
damageto
to
to
tothe
the
the
theMeter
Meter
Meter
Meteror
or
or
orinjury
injury
injury
injuryif
if
if
ifthe
the
the
thefuse
fuse
fuse
fuse
blows,
blows,
blows,
blows,never
never
never
neverattempt
attempt
attempt
attemptan
an
an
anin-circuit
in-circuit
in-circuit
in-circuitcurrent
current
current
current
measurement
measurement
measurement
measurementwhere
where
where
wherethe
the
the
theopen-circuit
open-circuit
open-circuit
open-circuitpotential
potential
potential
potentialto
to
to
to
earth
earth
earth
earthis
is
is
isgreater
greater
greater
greaterthan
than
than
than250V.
250V.
250V.
250V.
To
To
To
Toavoid
avoid
avoid
avoiddamage
damage
damage
damageto
to
to
tothe
the
the
themeter,
meter,
meter,
meter,check
check
check
checkthe
the
the
themeter's
meter's
meter's
meter's
fuse
fuse
fuse
fusebefore
before
before
beforeproceeding.
proceeding.
proceeding.
proceeding.Use
Use
Use
Usethe
the
the
theproper
proper
proper
properterminals,
terminals,
terminals,
terminals,
function,
function,
function,
function,and
and
and
andrange
range
range
rangefor
for
for
foryour
your
your
yourmeasurement.
measurement.
measurement.
measurement.Never
Never
Never
Never
place
place
place
placethe
the
the
theprobes
probes
probes
probesin
in
in
inparallel
parallel
parallel
parallelwith
with
with
witha
a
a
acircuit
circuit
circuit
circuitor
or
or
or
component
component
component
componentwhen
when
when
whenthe
the
the
theleads
leads
leads
leadsare
are
are
areplugged
plugged
plugged
pluggedinto
into
into
intothe
the
the
the
current
current
current
currentterminals.
terminals.
terminals.
terminals.
TheMeter'scurrentrangesare400.0µA,4000µA,40.00mA,
400.0mA,and10.00A.
To measurecurrent:
1.Turnoffpowertothecircuit.Dischargeallhighvoltage
capacitors.
2.SettherotaryswitchtotheµA,mAorArange.
3.PresstheSELECT
S ELECT
SELECT
SELECTkeytoselectDCAorACAmeasuring
mode.
4.ConnecttheblacktestleadtotheCOM
C OM
COM
COMterminalandthe
redtestleadstothemAterminalforamaximumof
400mA.Foramaximumof10A,movetheredtestlead
tothe10
10
10
10A
A
A
Aterminal.
22