General-technologies TA500 SmarTach+COP : Multisystem Engine Analyser Manual de usuario descargar pdf (Pagina 7)

4. APPLICATION INFORMATION

4.1 Taking measurements

1-Selecttheignitionsystemtomeasurefollowingtheinstructionsinin‘3.4 Measurement

Procedures’.

2-ObservethesparkburntimeandsparkKVoltreadingofthedisplay.Somevariations

ofthereadingsarenormalandreectsactualchangesinthesparkvoltageandburn

timeintheignitionsystem.

3-Record or memorize the maximum, minimum and average reading.  Repeat the

testforeachofthesparkplugwiresorignitionmodulesoftheengineandnoteany

readingsthataresignicantlyhigherorlowerthantheaverage.

4-Ignition problems may sometimes appear at higher engine RPM, but not at low

or idle speed. We recommend that measurements be made at idle speed and

normal engine operating temperature, and then at increasing RPM, and up to

equivalentofhighwayspeeds,typicallyabout2000to2500RPM.Donotexceedmaximum

permissible(“red-line”)enginespeeds.Makeallmeasurementsataboutthesame

enginespeeds,usingtheTA500tachometerfunctiontochecktheRPM.

4.2 Diagnostic using spark burn time and spark KVolt readings

SmallvariationsinsparkburntimeandsparkKVoltreadingsfromcylindertocylinderare

normal,anddonotindicateanyproblem.

Fordiagnosticpurposes,theattentionshouldbefocusedonSIGNIFICANTDIFFERENCES

inreadings,mostlikelycausedbyproblemsintheengineortheignitionsystemitself.

Important:

•TheRPMandsparkburntimedisplayedbytheTA500areabsolutemeasurements.

•SparkKVoltisarelativemeasurementandshouldbeusedonlytocomparebetween

ignitionmodulesorsparkplugwiresinthesameengine.

•InCOPmode,alwaysperformacalibrationofthesparkKVoltinoneoftheignition

modulesasdescribedin‘3.4.2MeasuringCoilonPlugandCoilnearPlugignition

systems’ beforeproceedingtomeasureandcompareresultsbetweencylinders.

•Whenmeasuringonsparkplugwires(SPWmode)theplacementofthecapacitive

pick-upalongthesparkplugwirewillalsocausesomevariation,duetotheinternal

resistance (or impedance) of the spark plug wire. For example, if the capacitive

pick-upisplacedonthesparkwirenearthedistributorortheDIScoil,voltagereading

willbehigherthanifplacednearthesparkplug.

4.3 Common causes of long burn time readings

• Shorted,dirtyortoosmallsparkpluggap.

• Dirty or damaged spark plug insulator or boot allowing spark “tracking” across

insulator.

• Richmixture.Mostlikelyduetoleakingfuelinjector,orfaultyoxygensensor.

• Lowcylindercompressionpressure.Couldbecausedbyleakingvalves,wornpiston

rings,blowncylinderheadgasket,etc.

3.5.2 Capture function (For COP and SPW modes)

ThecapturefunctionisusedtomeasureandholdmaximumsparkKVoltandsparkburntime

readings.Thisfunctionismostusefulwhenperformingano-starttestorwhenmeasuring

ignitionmodulesinplacesinwhichitisdifculttopositionthecapacitivepick-upoverthe

moduleandreadthedisplayatthesametime.

Tousethecapturemode:

1-Followthedirectionsin‘3.4 MeasurementProcedures’,tosetuptheTA500.

2-Press and hold the ‘Secondary Function / Capture’ button (for approximately 3

seconds)untilaashing“CAP”appearsinthesecondarydisplayA.

3-To exit the capture mode, press the ‘Secondary Function / Capture’ button

momentarilyagain.

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Notes:

•ThecapturefunctionholdsthemaximumsparkKVoltandsparkburntimedisplayed

(measured)values.

•Thevaluesheldwhileincapturemodecanberesetbypressingthe‘Power ON/OFF

/ Reset’buttonmomentarily.

• Whenincapturemode,onlythe‘Power ON/OFF / Reset’ and ‘Secondary Function /

Capture’ buttons will remainoperative,inordertopreventaccidentalchangesinthe

setupoftheTA500.

•Uponexitingthecapturemode,theheldvaluesarereset.

3.5.3 Auto power off

To help prolong battery life, the TA500 will automatically turn off after a period of

approximately3minutesofinactivity.

Aperiodofinactivitymeans:

•Nobuttonsarepressed

•Nomeasurementsaretaken

Burn Time

Cycles

Peak

Fig.8-Typicaldisplayincapturemode

Flashingletters

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