Autel Intelligent Tech 18MXFULTRA User Manual
Figure 8-48 Sample DLC Connection Diagram
To open and set the DLC channel
1. Tap the right column of the channel D button at the bottom of the screen to
open the setting dialog box.
2. Select the DLC Channel in the left column of the dialog box.
3. Swipe the Enable DLC channel to ON. Select the appropriate pins.
Figure 8-49 Sample DLC Channel Setting Screen 1
4. Close the dialog box, the selected result is displayed on the screen. Tap the
amplitude setting button on the bottom of the screen to adjust the value for
the DLC channel.
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Figure 8-50 Sample DLC Channel Setting Screen 2
Figure 8-51 Sample DLC Channel Setting Screen 3
5. Tap the DLC icon in the lower left corner of the screen to close the DLC
channel.
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Figure 8-52 Sample DLC Channel Setting Screen
Trigger
The trigger feature is used to stabilize repetitive waveforms to obtain a clear signal
characterization.
A trigger is activated when a signal crosses set thresholds. Trigger points can also
be set manually as the user views a waveform.
When the oscilloscope is capturing the signal, tap the left column of the Trigger
button to activate the trigger function. A trigger point displays as a blue point.
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Figure 8-53 Sample Trigger Point Screen
When the oscilloscope is capturing the signal, tap the right column of the Trigger
button to open the trigger settings dialog box.
Figure 8-54 Sample Trigger Settings Screen
Edge Triggering
The edge trigger is one of the most common trigger modes and is activated when
voltage rises above or falls below a preset threshold. This trigger type allows you to
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Trigger Mode
Description
None
In this trigger mode, the oscilloscope can continuously capture
data, without waiting for a trigger event.
Auto
In this trigger mode, the oscilloscope will wait for a trigger
before capturing data. It can automatically update after a short
period, even if the signal does not across the trigger point.
Repeat
In this trigger mode, the oscilloscope waits until a trigger event
occurs. If there is no trigger event, nothing will be displayed on
the screen.
Single
In this trigger mode, the oscilloscope stops capturing data once
a trigger event occurs.
configure the trigger mode, threshold, trigger channel and pulse direction settings.
Tap Done to save the settings or tap Cancel to exit without saving.
Trigger Mode
Four trigger modes are available: None, Auto, Repeat and Single.
Figure 8-55 Sample Trigger Mode Screen
The table below offers brief descriptions for each trigger mode.
Table 8-4 Trigger Mode Table
Channel
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Select the applicable trigger channel from the dropdown menu. The selected
channel is the one that the oscilloscope monitors for the trigger condition.
Figure 8-56 Sample Trigger Channel Screen
Pulse Direction
Two pulse direction settings are available: Rise and Fall.
Figure 8-57 Sample Pulse Direction Screen
Rising Edge Trigger - Indicates trigger is turned on to start the trace on the rising
edge of the waveform.
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Falling Edge Trigger – Indicates trigger is turned on to start the trace on the
falling edge of the waveform
Threshold
The Threshold allows you to set the voltage threshold for the trigger.
To precisely position the trigger point, input the value in the Threshold field in the
trigger settings dialog box.
To roughly position the trigger point, drag the trigger point to a desired position.
To configure the trigger settings
1. Tap the right column of the Trigger button to open the trigger settings dialog
box.
2. Select the trigger mode, trigger channel and pulse direction in the dropdown
list.
3. Input the value in the Threshold field in the trigger settings dialog box.
4. Tap Done to save settings or tap Cancel to exit without saving.
Advanced Edge
This trigger type includes all the functions of the edge trigger type, plus two
additional options: the Rising or Falling option and the hysteresis option.
Rising or Falling option in the dropdown menu of the pulse direction: Dual edges
of a waveform can be triggered. This mode is especially useful for monitoring pulses
of both polarities at once.
Hysteresis option: It is used to reduce false triggering on noisy signals. When
hysteresis is enabled, a second trigger threshold voltage is used in addition to the
main trigger threshold. The trigger fires only when the signal crosses the two
thresholds in the correct order. The first threshold arms the trigger, and the second
causes it to fire.
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Figure 8-58 Sample Advanced Edge Screen
Pulse Width
This trigger type allows you to monitor pulses of a specified width.
Figure 8-59 Sample Pulse Width Settings Screen
To set the pulse width
1. Tap the Trigger button at the bottom of the screen to open the Trigger
Settings dialog box.
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2. Select the Pulse Width in the left column of the dialog box.
3. Select the desired trigger mode and channel mode.
4. Set the pulse direction to either Positive pulse or Negative pulse according to
the polarity of the pulse.
5. Select one of the four Conditions:
More than: triggers on pulses wider than the specified time.
Less than: triggers on pulses narrower than the specified time.
In the time range: triggers on pulses wider than Time 1 but narrower
than Time 2.
Out of the time range: triggers on pulses narrower than Time 1 but
wider than Time 2.
6. Set the trigger Threshold and Hysteresis.
7. Set the Time 1 or Time 2 in minutes (if available) to define the pulse width.
8. Tap Done to save settings or tap Cancel to exit without saving.
Buffer
The waveform buffer shows which signal waveform is displayed on the current
screen and how many signal waveforms are captured and stored in the buffer
memory.
The oscilloscope can capture and store up to 32 waveforms. Select a waveform
from the waveform buffer by tapping the Previous or Next button.
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Name
Button
Description
Previous
Tap to display the previous waveform in the buffer.
Buffer
Index
Displays the number of the waveform currently
displayed onscreen out of the total number of
buffered waveforms.
Next
Tap to display the next waveform in the buffer.
Figure 8-60 Sample Buffer Screen
Time Base
The time base controls the time interval across the oscilloscope display. Tap the
Time Base button at the bottom to open the setting dialog box.
Continuous Mode: if the time base is set to more than or equal to 200ms/div, the
oscilloscope switches to the continuous mode. In this mode, the oscilloscope
updates the trace continuously as each capture progresses, rather than waiting for
a complete capture before updating the trace.
Figure 8-61 Sample Time Base Screen
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Measurement
The available measurements for each channel are (from left to right):
Figure 8-62 Sample Measurement Screen
Maximum – the highest level that the signal reaches
Minimum – the lowest level that the signal reaches
Peak To Peak – the difference between maximum and minimum
Amplitude – the top value minus the bottom value
Period – the duration of one cycle in a repeated pattern in the waveform
Frequency – the number of signal occurrences per second
Positive Duty Ratio – the ratio of positive pulse width to period width
Negative Duty Ratio –the ratio of negative pulse width to period width
Positive Pulse Width – the amount of time that the signal spends above its
average value
Negative Pulse Width – the amount of time that the signal spends below its
average value
AC RMS – the root mean square (RMS) value of the waveform minus the DC
Average
True RMS – the root mean square (RMS) value of the waveform, including
the DC component
DC Average – the average value of the waveform
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Rising Rate – the rate at which the signal level rises
Falling Rate – the rate at which the signal level falls
Rise Time – the time the signal takes to rise from the lower threshold to the
upper threshold
Fall Time – the time the signal takes to fall from the upper threshold to the
lower threshold
X@Max – the corresponding value of X axis when the amplitude is the
maximum
X@Min – the corresponding value of X axis when the amplitude is the
minimum
Positive Acreage – the waveform acreage measured above the zero
baseline
Negative Acreage – the waveform acreage measured below the zero
baseline
Full Acreage – the positive acreage plus negative acreage
Top Value – 90% of the waveform maximum value
Bottom Value – 10% of the waveform minimum value
Positive Overshoot – the ratio of the difference between the maximum value
and the top value and the amplitude
Negative Overshoot – the ratio of the difference between the bottom value
and the minimum value and the amplitude
Positive Pre-shoot – the ratio of the difference between the bottom value
and the minimum value and the amplitude
Negative Pre-shoot –the ratio of the difference between the maximum value
and the top value and the amplitude
To set the measurements
1. Tap the Measure button at the bottom of the screen to open the
measurement dialog box.
2. Select the channel to be measured.
3. Select the appropriate measurement options. The Whole Track and Ruler
Track can be toggled through the Edit icon in the upper corner of the option.
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Figure 8-63 Sample Measurement Setting Screen
4. Close the dialog box, and the corresponding measurement readings are
displayed on the right-hand side of the screen. Adjust the whole track or ruler
track on the displayed screen or delete the measurement directly by tapping
the X button.
Figure 8-64 Sample Measurement Display Screen
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8.1.6 Troubleshooting
A. If the oscilloscope cannot communicate with the MaxiSys Tablet:
Ensure the VCMI device is properly connected to the MaxiSys Tablet via Wi-Fi or
with the supplied USB cable.
Restart the MaxiSys Tablet and reconnect the VCMI device if communication
between the two continues to fail.
B. If unwanted signals are displayed or signals are distorted:
Use only the supplied test leads or probes to connect with the input channels.
Check the test leads or probes for damage.
Ensure the polarity of the test leads connections are correct.
Ensure the signal and ground connections are clean and secure.
Ensure the ground lead is providing a direct ground from the circuit to the input
channel.
Isolate the test leads from other components, leads, or systems that may induct
unwanted noise into the signal being tested including the electric motors,
secondary ignition components, relays, alternators.
8.1.7 Glossary
AC/DC Control
Each channel can be set to either AC coupling or DC coupling. With DC coupling,
the voltage displayed onscreen is equal to the true voltage of the signal with respect
to ground. With AC coupling, any DC component of the signal is filtered out, leaving
only the variations in the signal for the AC component.
Aliasing
When the signal frequency gets higher than half the scope’s maximum sampling
rate and exceeds the limit, a distorted waveform displays. This distortion is called
aliasing.
Amplitude
The maximum voltage generated from the zero volts line of the oscilloscope.
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Analog Bandwidth
The frequency at which a displayed sine wave has half the power of the input sine
wave (about 71% of the amplitude).
Buffer Size/Cache Size
The size of the oscilloscope’s buffer memory. The buffer memory is used by the
oscilloscope to temporarily store data. This helps to compensate for the differences
in data transfer rate from one device to another.
Frequency
The number of signal occurrences per second. Frequency is measured in Hz
(hertz).
Peak to peak voltage
The difference in voltage between the minimum and maximum voltages occurring in
the waveform.
Time Base
The time interval across the scope display.
Voltage Range
The range between the maximum and minimum voltages that can be accurately
captured by the oscilloscope.
Sampling Rate
The number of samples per second captured by the oscilloscope. The faster the
sampling rate of the scope, the more frequently it measures the signal voltage, and
so the more detailed will be the trace that appears on the scope screen.
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8.2 Multimeter Operation
A multimeter is an electronic measuring instrument that is used to measure voltage,
resistance, frequency, diode, duty cycle and pulse width and continuity test. The
VCMI (Vehicle Communication and Measurement Interface) working with MaxiSys
Ultra can function as a multimeter to provide precise measurements.
8.2.1 Safety Information
Follow the instructions below to reduce the risk of injury from electric shock and
prevent equipment damage.
Use the multimeter only as specified in this manual.
Do not apply more than the rated voltage between terminals or between any
terminal and earth ground.
Do not input a value beyond the range when measuring. Remember that the limit
value range of this multimeter is ±200V.
To prevent injury or death, do not use the multimeter if it appears to be damaged
in any way, and stop use immediately if you are concerned with any abnormal
operations.
To prevent injury or death, never ground yourself when taking electrical
measurements. Isolate yourself from ground by using dry rubber insulating mats
to cover all exposed/grounded metal. Ensure all clothing including gloves are dry.
Stand on rubber mats when using tool.
Use the test leads or probes supplied with the product, or proper and applicable
terminals. Inspect the test leads or probes for damage before use.
When using probes, keep fingers behind the finger guards on the probes.
Use the supplied replacement fuses or specified replacement parts.
Always consider electrical and electronic equipment to be energized (live). Never
assume any equipment is de-energized.
When making electrical connections, connect the common test lead before
connecting the live test lead; when disconnecting, disconnect the live test lead
before disconnecting the common test lead.
When measuring current, turn off circuit power before connecting the multimeter
to the circuit. Remember to place the multimeter in series with the circuit.
After current measurement is finished, turn off the power to the circuit before
removing the test leads and before reconnecting any disconnected wires or
devices.
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Do not add voltage to the input terminal when measuring resistance.
To avoid electric shock, turn off the power to the component before connecting.
To prevent damage, always use and store your multimeter in appropriate
environments.
Do not use in wet or damp conditions, or around explosive gas or vapor.
Do not tamper with or disassemble the multimeter, connectors or accessories.
Internal damage will affect performance.
Before carrying out maintenance and cleaning of the multimeter, make sure the
unit is NOT connected to a power source, vehicle or computer.
When cleaning the multimeter, use a damp, soft cloth with mild detergent. Do not
allow water to enter the multimeter casing.
8.2.2 General Introduction
8.2.2.1 Component Locations
The multimeter jacks are located on the top of the VCMI device while the input
channels are located on the bottom.
VCMI Top View
1. Multimeter Jacks – for ground and signal cables
2. USB Port
3. Hook
4. DC Power Supply Input Port
5. Power Button
IMPORTANT
When using the multimeter function, please insert the supplied multimeter probes to
the multimeter probe jacks. The input channel A is assigned when measuring
current.
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Item
Description
Voltage Range
±200V
Resistance Range
1Ω to 10MΩ
Diode
2V
Frequency Range
1Hz to 1MHz
Duty Cycle Range
%1 to 99%
Pulse Width Range
10us to 1000ms
Current Range
0 to 65A (65A current clamp)
0 to 650A (650A current clamp)
65A current
clamp
650A current
clamp
Large Dolphin
Clip
Small Crocodile
Clip
Multimeter
Probe
Back-pinning
Probe
Flexible
Back-pinning
Probe
Breakout Lead
Battery Clip
8.2.2.2 Technical Specifications
8.2.2.3 Accessories
The following accessories are compatible with the multimeter and oscilloscope.
Please refer to Accessories on page 107 for details.
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Multimeter Test Lead
Used to connect the multimeter and multimeter probe.
The two multimeter test leads (Red: SA015 / Black: SA016) are standard for the
multimeter and signal generator.
8.2.3 Getting Started
Before opening the Multimeter application, ensure the VCMI device is connected to
the tablet Wi-Fi or with the supplied USB cable. For more information, see Establish
Vehicle Communication on page 20.
Figure 8-1 Sample Connection Diagram
To open the multimeter application
1. Insert the applicable test leads or probe terminal ends into the multimeter
jacks to complete the connection.
2. Tap the Measure icon on the Home screen of the MaxiSys Ultra Tablet. The
Measurement screen opens.
3. Tap the Multimeter icon to open the Multimeter Menu.
4. Select a test to continue.
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NOTE
Please check the multimeter LED status indicator on the front panel of VCMI device.
The multimeter LED lights green when operating in the multimeter mode.
8.2.4 Multimeter Update
The operating software of the multimeter is continually optimized. Tap the Help
button in the upper half of the screen to update.
Before update the multimeter software, please ensure the tablet has a stable
Internet connection.
8.2.4.1 APK Update
NOTE
The acronym APK (Android Package Kit) is used on the tablet and in this manual.
This file contains all the assets of a particular app. To update the APK, is to install
the latest version of the app on your tablet.
To update the APK
1. Tap the Help button on the upper half of the screen. A dropdown menu
displays.
Figure 8-2 Sample Help Screen
2. Tap the Update the APK in the dropdown menu. A confirmation message
displays.
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Figure 8-3 Sample Update Confirmation Screen
3. Tap OK to update the software or tap Cancel to exit.
8.2.5 Screen Layout and Operations
Tap the Measurement icon on the home screen then tap the Multimeter icon in the
menu, the multimeter page displays. The screen typically includes the following
button sections.
NOTE
The Multimeter application can also be opened via the Android home screen. Tap
the Measure icon at the top of the Android home screen. Tap Multimeter icon.
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