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LAUNCH

X431 GDS Scopebox Manual

Fig.4-12

4.7 Waveform analysis mode

The ignition secondary single-cylinder waveform test is mainly used
to:
a. Analyze the ignition dwell angle of single cylinder.(ignition coil

charging time)

b. Analyze the capability of ignition coil and secondary high

tension circuit (from ignition line to ignition voltage line).

c. Find the improper mixture A/F ratio of single cylinder (from

combustion line).

d. Analyze the capability of capacitance (platinum or ignition

Summary of Contents for X431 Scopebox

Page 1: ...y connected to the DLC to avoid communication interruptions z During operation keep the screen upward and leveled z Be careful when plugging and unplugging the main cable and diagnostic connector Tigh...

Page 2: ...L INTERFACE INTRODUCTION 6 3 3 OPERATIONS 7 3 3 1 Channel selection and attributes setting 7 3 3 2 Trigger setting 9 3 3 3 Auto calibration 11 3 3 4 Display settings 12 3 3 5 Channel and cursor measur...

Page 3: ...erve for the fast signal having great convenience to failure analysis Either high speed signal e g injection nozzle intermittent fault signal or the slow speed signal e g the throttle position change...

Page 4: ...parameters namely amplitude frequency shape pulse width and array 1 3 Product function Provides specialized automotive oscilloscope function and supports ignition waveform analysis 1 4 Technical para...

Page 5: ...1 Scopebox Structure Diagram Table 2 1 shows the ports and indicators for X 431 PAD Scopebox No Name Description 1 CH1 Channel 1 2 CH2 Channel 2 3 CH3 Channel 3 4 CH4 Channel 4 5 External trigger Exte...

Page 6: ...n unit via USB connect line as separated individual USB devices 2 2 Scopebox accessories Scopebox includes the secondary pickup cable for 4 channel oscilloscope crocodile clips for 4 channel oscillosc...

Page 7: ...LAUNCH X431 PAD Scopebox User s Manual 4 6 way universal guide line for 4 channel oscilloscope 5 BNC to 4mm connector test cable 6 Pin connector for 4 channel oscilloscope 5...

Page 8: ...d double clip power cord 2 Then plug one end of ground cable of oscilloscope into external trigger channel GND the other end should be grounded 3 Connect one end of probe cable of oscilloscope to the...

Page 9: ...m replay View Calibration and display settings are available Measure includes signal source measurement cursor measurement and clear measurement Settings displays or hides the parameter settings area...

Page 10: ...are marked in different colors Fig 3 2 2 Channel attributes setting Channel attributes can be set via horizontal settings and vertical settings Horizontal Settings User can make some settings directly...

Page 11: ...iptions A Channel selection B Channel switch selection C Channel voltage adjustment D Channel coupling modes selection DC AC or Ground E Channel probe selection F Bandwidth limit switch G Channel reve...

Page 12: ...width Fig 3 5 and Fig 3 6 show edge trigger pulse width trigger setting interfaces Fig 3 5 Fig 3 6 2 Trigger Sweep Auto Normal and Single are included Auto It indicates that no matter whether it meets...

Page 13: ...er voltage calibration of trigger circuit and nonlinear calibration of horizontal baseline movement Click View and then click Calibration a dialog box similar to Fig 3 8 will appear Fig 3 8 Check the...

Page 14: ...ors or Dots to define display mode Check uncheck the box before Grid to open close grid display 3 3 5 Channel and cursor measurement 1 Channel measurement Click Measure and then Source a screen simila...

Page 15: ...nt for timebase A line is a solid line and B line is a dotted line 3 Clear Measurement Click Measure and then Clear Measure the system will clear the measurement result 3 3 6 File management 1 Record...

Page 16: ...enables you to import the stored waveform file for playback and review During replaying the oscilloscope stops collecting data automatically Click File then select Waveform replay from the pop up men...

Page 17: ...nt out the latest collected data while the oscilloscope stops collecting data While printing the oscilloscope should be in stop mode Click on the shortcut bar to start printing 3 3 7 View the software...

Page 18: ...ntification signal so that the ignition system can send out ignition signal to specified cylinder in specified time each cylinder has its independent ignition coil 3 Simultaneous ignition system two c...

Page 19: ...on the left side from the front to the back are as follows 2 4 6 then the ignition sequence is 1 4 5 2 3 6 If the cylinder numbers on the right side from the front to the back are as follows 2 4 6 an...

Page 20: ...For the capacitor discharge voltage 4 Ignition voltage pulse For the charge and discharge sections 5 Spark line The inductance discharge process i e the mutual inductance voltage of ignition coil mai...

Page 21: ...the whole cycle the contact closed angle just 45 50 four cylinder 63 70 six cylinder or 64 71 eight cyliner the breakdown voltage is over 15kv the spark voltage is about 9kV the spark period is great...

Page 22: ...ary ignition pickup into CH1 CH2 CH3 CH4 channel of Scopebox then connect the high voltage clip to high voltage line and crocodile clips to ground 2 If no high voltage wire exposes dismantle ignition...

Page 23: ...n off of primary circuit is not opening closing of mechanical contact but the conduction of transistor The primary voltage has no obvious oscillations within the duration but the voltage increases dur...

Page 24: ...e c Find the improper mixture A F ratio of single cylinder from combustion line d Analyze the capability of capacitance platinum or ignition system e Find the spark plug that causes misfire of the cyl...

Page 25: ...nsistence of flashover voltage Too high flashover voltage even out of the oscilloscope screen represents a high resistance existed in the ignition secondary circuit for example open circuit or damaged...

Page 26: ...lty primary voltage waveform collected by the ignition analysis the related components and mechanical equipment status of ignition system electrical circuit can be analyzed which provides a reliable b...

Page 27: ...gular beating is caused by insufficient spring force Fig 4 8 The curve on Fig 4 9 shows the contact angle is too small during the magnetizing period which is caused by too large contact gap Fig 4 9 A...

Page 28: ...ou can only replace the ignition coils igniter ignition signal generator and cam position sensor etc one by one to find out the faulty component or module Fig 4 11 The secondary waveform is also affec...

Page 29: ...LAUNCH X431 PAD Scopebox User s Manual 27...

Page 30: ...LAUNCH X431 PAD Scopebox User s Manual Fig 4 12 28...

Page 31: ...Injection nozzle intermittent fault signal or the slow speed signal e g the throttle position change and the oxygen sensor signal can be observed through automotive oscilloscope in an appropriate wave...

Page 32: ...shape pulse width and array 1 3 Product function Provides specialized automotive oscilloscope function and supports ignition waveform analysis 1 4 Technical parameters Scopebox 4 channels highest sam...

Page 33: ...Fig 2 1 Scopebox Structure Diagram Table 2 1 shows the ports and indicators for the scopebox No Name Description 1 CH1 Channel 1 2 CH2 Channel 2 3 CH3 Channel 3 4 CH4 Channel 4 5 External trigger Ext...

Page 34: ...ted individual USB devices 2 2 Scopebox accessories The scopebox includes the secondary pickup cable for 4 channel oscilloscope crocodile clips for 4 channel oscilloscope etc See Table 2 2 As the prod...

Page 35: ...LAUNCH Android based Scopebox User s Manual 4 6 way universal guide line for 4 channel oscilloscope 5 BNC to 4mm connector test cable 6 Pin connector suite for 4 channel oscilloscope...

Page 36: ...ernal trigger channel GND the other end should be grounded 3 Connect one end of probe cable to the CH1 CH2 CH3 or CH4 on the scopebox and then connect the other end to related signal terminal Warning...

Page 37: ...rence enables you to recall your customized expert database whereas base reference provides automatic pre setting function of specialized sensors See Chapter 3 3 6 File Provides save snapshot snapshot...

Page 38: ...nel tab shown at the bottom of the waveform display area B Select from Vertical settings Note For better comparison and identification each channel and waveform are marked in different colors Fig 3 2...

Page 39: ...determines when the scopebox starts to acquire data and display a waveform When a trigger is set up properly it can convert unstable displays or blank screens into meaningful waveforms When the scope...

Page 40: ...ncluded AC Blocks the DC component of the input signal DC Passes both AC and DC components of the input signal Ground Disconnects the input signal Probe When using a probe the scopebox allows you to s...

Page 41: ...s the trigger point on the rising or the falling edge of a signal Menu Comments Settings Sweep The sweep mode determines how the scopebox behaves in the absence of a trigger event The scopebox provide...

Page 42: ...lse Width trigger is selected Pulse trigger occurs according to the width of pulse The abnormal signals can be detected through setting up the pulse width condition Menu Comments Settings Sweep The sw...

Page 43: ...h High Freq Rejection Reject high frequency signals when selected 3 3 2 Auto The scopebox has an Auto feature that sets up the scopebox automatically to display the input signal in a best fit Tap the...

Page 44: ...top calibrating Once it becomes active it indicates calibration has completed Notes In process of calibration make sure CH1 CH2 CH3 CH4 has no signal input Moreover calibration may take several minute...

Page 45: ...t check uncheck the box before On Off 3 Display settings Tap and then Display settings to enter the setting screen See Fig 3 8 Fig 3 8 Select Vectors or Dots to display waveforms as vectors or dots Ch...

Page 46: ...Measure are used to measure voltage parameter and time parameter respectively Drag A line upwards or downwards to control voltage Move A line left or right to fine tune timebase A line is a solid line...

Page 47: ...d then Save Snapshot to store the current screen 2 Snapshot manager While viewing sampling data tap and then Snapshot Manager to enter View delete and edit operations are supported 3 Record waveform T...

Page 48: ...rding While recording the recorded pages will be shown on the screen 4 Load waveform for playback The Import function enables you to import the stored waveform file for playback and review During repl...

Page 49: ...Scopebox User s Manual Fig 3 12 Select the file first and then tap to open the waveform file Tap to starting the playback and tap to stop it Fig 3 13 To delete the waveform file tap Tap to return to...

Page 50: ...a snapshot 2 Select Joint the expert database refer to the following illustration and then tap to save the waveform being displayed on the screen as REF Fig 3 14 Tap and then Expert Reference to ente...

Page 51: ...LAUNCH Android based Scopebox User s Manual Fig 3 15 3 3 7 Exit the application Tap to exit the current application...

Page 52: ...d out the ignition timing signal and cylinder identification signal so that the ignition system can send out ignition signal to specified cylinder in specified time each cylinder has its independent i...

Page 53: ...cylinder numbers on the left side from the front to the back are as follows 2 4 6 then the ignition sequence is 1 4 5 2 3 6 If the cylinder numbers on the right side from the front to the back are as...

Page 54: ...tage For the capacitor discharge voltage 4 Ignition voltage pulse For the charge and discharge sections 5 Spark line The inductance discharge process i e the mutual inductance voltage of ignition coil...

Page 55: ...ith the whole cycle the contact closed angle just 45 50 four cylinder 63 70 six cylinder or 64 71 eight cyliner the breakdown voltage is over 15kv the spark voltage is about 9kV the spark period is gr...

Page 56: ...condary ignition pickup into CH1 CH2 CH3 CH4 channel of Scopebox then connect the high voltage clip to high voltage line and crocodile clips to ground 2 If no high voltage wire exposes dismantle ignit...

Page 57: ...the on off of primary circuit is not opening closing of mechanical contact but the conduction of transistor The primary voltage has no obvious oscillations within the duration but the voltage increase...

Page 58: ...line c Find the improper mixture A F ratio of single cylinder from combustion line d Analyze the capability of capacitance platinum or ignition system e Find the spark plug that causes misfire of the...

Page 59: ...consistence of flashover voltage Too high flashover voltage even out of the scopebox screen represents a high resistance existed in the ignition secondary circuit for example open circuit or damaged...

Page 60: ...faulty primary voltage waveform collected by the ignition analysis the related components and mechanical equipment status of ignition system electrical circuit can be analyzed which provides a reliab...

Page 61: ...irregular beating is caused by insufficient spring force Fig 4 8 The curve on Fig 4 9 shows the contact angle is too small during the magnetizing period which is caused by too large contact gap Fig 4...

Page 62: ...al you can only replace the ignition coils igniter ignition signal generator and cam position sensor etc one by one to find out the faulty component or module Fig 4 11 The secondary waveform is also a...

Page 63: ...LAUNCH Android based Scopebox User s Manual...

Page 64: ...LAUNCH Android based Scopebox User s Manual Fig 4 12...

Page 65: ...ually 5 10 times of the measured signal The automotive oscilloscope not only can quickly capture the circuit signal but also can slowly display the waveform to observe and analyze It can also record a...

Page 66: ...ontrol units etc 1 2 Product features z Rapidly capture the circuit signal z Display waveform slowly for observation and analysis z Record and store the tested signal waveform for playback and failure...

Page 67: ...ries 2 1 Scopebox structure cture Diagram Table 2 1 shows S Scopebox Fig 2 1 Scopebox Stru the ports and indicators for X 431 GD No Name Description 1 CH1 Channel 1 2 CH2 Channel 2 3 CH3 Channel 3 4 C...

Page 68: ...r will blink Green 10 Power interface Connect to power supply via the power adapter 11 B shaped USB interface Connect main unit via USB connect line as separated individual USB devices 2 S x acc kup c...

Page 69: ...Name 1 Secondary ignition pickup for 4 channel oscilloscope 2 Crocodile clips for 4 channel Oscilloscope 3 xtension cord Direct ignition e 4 6 way universal guide line for 4 channel oscilloscope 5 BN...

Page 70: ...ble clip power cord 2 Then plug one end of ground cable of oscilloscope into external trigger channel GND the other end should be grounded 3 Connect one end of probe cable of oscilloscope to the CH1 C...

Page 71: ...eform show hide the grid display cached interface turn pages and clear Trigger The following options are available one channel trigger alternation trigger trigger channel source trigger types trigger...

Page 72: ...n A Select from the channel menu B Select via each channle attribute button See Fig 3 2 Fig 3 2 2 Channel attributes setting Each channel features five attributes A Channel switch selection B Channel...

Page 73: ...ease time base by one level D Channel phase selection normal phase or reverse phase E Channel coupling modes selection DC AC or Ground See Fig 3 3 and Fig 3 4 for channel 1 channel 4 attributes settin...

Page 74: ...trigger and alternation trigger are included Single channel trigger collects all channels data by triggering one channel Alternation trigger Each channel collects data separately based on its own cha...

Page 75: ...CH X431 GDS Scopebox Manual Fig 3 5 Single channel trigger Fig 3 6 Alternation trigger 2 Trigger channel To set trigger mode and voltage for one channel please select this channel first See button Tri...

Page 76: ...Auto continuous trigger Automatically trigger when it meets the trigger conditions otherwise the trigger will be forced by system Normal continuous trigger Trigger only when the trigger conditions are...

Page 77: ...sely tune the horizontal trigger and make fine adjustment in the horizontal trigger hold off zone 6 Auto calibration Click Auto calibrated button the oscilloscope will perform automatic calibration Au...

Page 78: ...LAUNCH X431 GDS Scopebox Manual Fig 3 8 3 3 3 Channel measurement 1 Timebase measurement Fig 3 9...

Page 79: ...ect A B measurement line The currently selected line is a solid line Left Right move fine adjutment button for timebase A B line time measurement line Measurement value display area an area for displa...

Page 80: ...3 3 4 Expert settings This option is specially designed to measure related vehicle sensors After selecting one sensor the osicilloscope will be preset based on preset value of this sensor Click Expert...

Page 81: ...scilloscope stops collecting data Touch File then select Store picture from the pull down list See Fig 3 12 Fig 3 12 2 Store waveform This item is to save the currently displayed waveforms as data fil...

Page 82: ...d to record waveforms that are collected by oscilloscope at a period and save it as data file which can be played back in future It can be performed when the oscilloscope stops collecting data Touch F...

Page 83: ...he recorded pages will be shown on the screen 4 Import waveform for playback The Import function enables you to import the stored waveform file for playback and review It only works when the oscillosc...

Page 84: ...To delete a waveform file please select it first then touch Delete button Click OK button to open the waveform file then use channel attributes setting to adjust the waveform display or touch File Pr...

Page 85: ...ption allows you to print the currently displayed waveform out through a specific printer Before printing make sure that the oscilloscope stops collecting data and the printer is properly connected Cl...

Page 86: ...LAUNCH X431 GDS Scopebox Manual Fig 3 17 6 Show hide the Grid Click File Grid button to show hide grid See Fig 3 18 Fig 3 18...

Page 87: ...stores 10 pages of cached waveform data While in data collection stop mode click File and then choose Pre Pg Next Pg Empty from the pull down menu to operate the cached data See Fig 3 19 Fig 3 19 3 3...

Page 88: ...turn to main menu screen Wi Fi setting to configure Wi Fi connection Version display the version information Exit program to exit this program View version information In main menu click System and th...

Page 89: ...LAUNCH X431 GDS Scopebox Manual Fig 3 21 3 3 6 View help file In main menu click Help to enter a screen similar to Fig 3 22 Fig 3 22...

Page 90: ...m and contact breaker with noncontact controlled ignition system combined with magnet hall components or infrared 2 Independent ignition system crankshaft sensor send out the ignition timing signal an...

Page 91: ...iguration to enter the interface shown as Fig 4 1 Fig 4 1 This interface includes six engine ignition analyses Primary Distributor ignition Primary Simultaneous ignition Primary Direct ignition Second...

Page 92: ...5 and the cylinder numbers on the left side from the front to the back are as follows 2 4 6 then the ignition sequence is 1 4 5 2 3 6 If the cylinder numbers on the right side from the front to the b...

Page 93: ...come the damper of high voltage line the contact breaker gap and the spark plug gap to release magnetizing energy 1 2 section is the breakdown voltage 3 Spark voltage For the capacitor discharge volta...

Page 94: ...ark delay period and two oscillations can also be tested For the ignition system without faults compared with the whole cycle the contact closed angle just 45 50 four cylinder 63 70 six cylinder or 64...

Page 95: ...system Beause the on off of primary circuit is not opening closing of mechanical contact but the conduction of transistor The primary voltage has no obvious oscillations within the duration but the v...

Page 96: ...g the BNC end of secondary ignition pickup into CH1 CH2 CH3 CH4 channel of Scopebox then connect the high voltage clip to high voltage line and crocodile clips to ground After properly connected power...

Page 97: ...roke in line eight cylinder 1 8 4 3 6 5 7 2 Five cylinder 1 2 4 5 3 V 6 engine generally speaking based on the person sitting on the driver cab if the right side cylinder numbers on the right side fro...

Page 98: ...sequence is 1 6 5 4 3 2 The Figure 4 6 below shows the normal ignition waveform of distributor ignition system the upper one is the secondary waveform and the lower one is the primary waveform The se...

Page 99: ...circuit 6 Contact point close the current flow into primary coil the primary coil oscillates due to the mutual inductance Primary ignition waveform Section a shows the voltage oscillation on the prima...

Page 100: ...means there is fault or the system needs to be adjusted 4 5 Secondary simultaneous ignition analysis Connections Plug the BNC end of secondary ignition pickup into CH1 CH2 CH3 CH4 channel of Scopebox...

Page 101: ...re 4 8 Fig 4 8 Fig 4 9 below shows the valid and invalid ignition waveforms Under the working status of valid ignition the breakdown voltage and spark voltage are higher because the cylinder is filled...

Page 102: ...and crocodile clips to ground 2 If no high voltage wire exposes dismantle ignition coil of tested cylinder and use direct ignition extension cord Connect one end to ignition coil which should be groun...

Page 103: ...LAUNCH X431 GDS Scopebox Manual ground Connections are shown in Fig 4 10 Fig 4 10 The secondary direct ignition interface is shown as the following Fig 4 11...

Page 104: ...off of primary circuit is not opening closing of mechanical contact but the conduction of transistor The primary voltage has no obvious oscillations within the duration but the voltage increases duri...

Page 105: ...Analyze the ignition dwell angle of single cylinder ignition coil charging time b Analyze the capability of ignition coil and secondary high tension circuit from ignition line to ignition voltage lin...

Page 106: ...nt parts of the waveform can specify that some components and systems on the specific cylinder have faults Refer to the instructions for various parts of waveform for the related component working sta...

Page 107: ...mbustion voltage Observe the consistence of spark or combustion voltage as it represents the consistence of spark plug and the air fuel ratio of each cylinder In case that the mixing ratio is too lean...

Page 108: ...the related components and mechanical equipment status of ignition system electrical circuit can be analyzed which provides a reliable basis for the adjustment and maintenance of power circuit to avo...

Page 109: ...kage Fig 4 14 The waveform on Fig 4 15 shows the accidental pumping during contact closing period The irregular beating is caused by insufficient spring force Fig 4 15 The curve on Fig 4 16 shows the...

Page 110: ...w voltage waveform in electronic ignition system The voltage does not rise during magnetizing which indicates that the effect of limitation of the circuit failed and no components on distributorless i...

Page 111: ...stion process mixture gas composition the engine thermal state of the ignition coil etc which is more complicated The following lists a large number of measured secondary faulty waveform for reference...

Page 112: ...LAUNCH X431 GDS Scopebox Manual...

Page 113: ...LAUNCH X431 GDS Scopebox Manual Fig 4 19...

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