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Audio Impedance Tester
FEATURES LargeLCD:68×34mm(2.677"×1.338"). Truemeasurementofspeakersystemsacturalimpedanceat1kHz. Threetestrangesallowtestingofhometheaterandcommercialsoundsystems. Measurestransformerimpedances. Batteryoperation. Lowbatteryindication. Dataholdfunction. 0Ωadjustment.
HOW TO USE Itisrecommendedadrawingbefirstmadeofthe
speakersystemtoverifyproperinstallation. Takecaretoensurethatthesystemisnotconnected
totheamplifier. Ensurethesystemundertestisnotlive. Checkbattery,if““symbolappearsonthedisplay,
replacewithnewbatteries. Shortthetipsoftheleads,adjustthe"0Ω.ADJ",control
tosetthereadingofzero. Connecttestleadstospeakerorspeakerleads.
Note:Speakersmaybeconnectedtogethereitherinseriesorparalleltoachievedesiredfinalimpedance. Rotarythefunctionswitchtosuitablerangethenpress
thepushbuttontotestandtakethereading.
Example : Measure system power-an 10W up(1106 IM) P=ZI2
P=V2/ZForexampleona100Vsystem:IfP=50WZ=V2/P=1002/50=200Ω(1)Thetestercanmeasureloaddownto2kΩ.(5Wat100Vline).(2)Thetestercan'tmeasure100Vsystemwithpowerlowerthan5W. Checkingaspeaker:
Speakersaregeneralfrom2to16Ω,use20Ωrangeorforhigherimpedancespeaker,use200Ωor2kΩrange.
1106 IM
SPECIFICATIONS 1106 IM 1107 IM
Measuringranges 0-20Ω/0-200Ω/0-2kΩ
0-200Ω/0-2kΩ/0-20kΩ
Testfrequency 1kHz
Accuracy
20Ω:±2%rdg±2dgtor±0.1Ω,whichisgreater200Ω/2kΩ:±2%rdg±2dgt
200Ω/2kΩ:±2%rdg±2dgt20kΩ:±3%rdg±2dgt
Lowbatteryindication ““Symbolappearsonthedisplay
Dataholdindication ““Symbolappearsonthedisplay
Dimensions 175(L)×85(W)×75(D)mmWeight(batteryincluded) Approx.600g
Powersource 1.5V(AA)×8
Safetystandard EN61010-1CATIII200VEN61326-1
Accessories InstructionmanualTestleadsSoftpouchBatteries
HOLD
TEST HOLD
0 .ADJ
COM
OFF
20200
2K
CAT. 200V AUDIO IMPEDANCE TESTER
1106 IM1106 IM
TEST HOLD
0 .ADJOFF200
2K20K
CAT 200V AUDIO IMPEDANCE TESTER
COM
1107 IM1107 IM
5F., NO.105, Jhongcheng Rd., Tucheng Dist., New Taipei City 23674, Taiwan (R.O.C.)
TEL: 886-2-22681528FAX: 886-2-22681529
e-mail: [email protected]
MEASURE WITH PRECISION
Audio Impedance TesterCheckingaPAsystem:PAsystemexample,usinga100Vconfiguration:
1:P=V2/Z=1002/1000=10000/1000=10W2:P=V2/Z=70.72/5000=5000/5000=1W
Z=V2/P=1002/P=10000/(10+50+200)=38.46Ω
(1)IfZmeasuredislower,checkforshortcircuitedwiresorfaultyspeakersortransformers.
(2)IfZmeasuredishigher,checkforwiringorcomponents(speakers,transformersorconnections.)
Mostamplifiersaredesignedforusewithtotalloadsbetween4Ωand8Ω.Totalloadsinexcessof8willnotcausedamagetotheamplifierbutmaycauseareductioninvolumeoutput.However,loadsthatarelessthan4Ωwillcausetheamplifiertogenerateexcessiveheat,andwillultimatelycausepermanentdamage.
Speakersystemswith70.7Vor25VtransformerslargebuildingcommercialsoundandPAsystemstypicallyutilizea70.7voltor25volttransformersateachspeakerandmustbeconnectedtoPAamplifierswithsuchoutputs.Thebenefitofthissystemisthatitgreatlyeasestheconnectionoflargenumbersofspeakerstoasingleamplifier,anditallowstheuseofsmallergaugespeakerwireovergreaterdistanceswithoutsignalloss.
Speakersequippedwithsuchtransformerswilltypicallyhavemultipleinputsatvaryingwattages.Ifallspeakersinagivensystemusethesameinputwattagetap,thevolumeateachspeakerwillbeequal.Ifmoresoundvolumeisdesiredatparticularspeakers,ahigherwattagetapmaybeusedatthosespeakers.Thetotalwattageofallspeakersaddedtogethermustnotexceedthewattageoutputoftheamplifierchannelinwhichtheyareconnected.Tomeasurespeakersystemsofthistype,impedancereadingmustbeconvertedtoWattsforyourspecificsystem.
TO ease the calculation of this type of system, the following charts are provided.
VoltageSystem ImpedanceReading(Ω)
25V 63 48 39 33 28 25 22 20 18
70.7V 500 384 312 263 227 200 179 161 147
100V 1 1000 769 625 526 455 400 357 323 294
Wattage(W) 10 13 16 19 22 25 28 31 34
VoltageSystem ImpedanceReading(Ω)
25V 2500 1250 625 63 31 21 16 13 10 9 8 7 6
70.7V 20k 10k 25k 500 250 167 125 100 83 71 62 56 50
100V 20k 10k 1000 500 333 250 200 167 143 125 111 100
Wattage(W) 0.25 0.5 1 10 20 30 40 50 60 70 80 90 100
Accessories
AL-24-5 CAC-1132
AL-21C2-4
BET-1800
5F., NO.105, Jhongcheng Rd., Tucheng Dist., New Taipei City 23674, Taiwan (R.O.C.)
TEL: 886-2-22681528FAX: 886-2-22681529
e-mail: [email protected]
MEASURE WITH PRECISION