Trademarks
Autel®, MaxiSys®, MaxiDAS®, MaxiScan®, MaxiTPMS®, MaxiRecorder®,MaxiCheck® and MaxiScopeTM are trademarks of Autel Intelligent Technology
Corp., Ltd., registered in China, the United States and other countries. All othermarks are trademarks or registered trademarks of their respective holders.

Copyright Information
No part of this manual may be reproduced, stored in a retrieval system ortransmitted, in any form or by any means, electronic, mechanical, photocopying,recording, or otherwise without the prior written permission of Autel.

Disclaimer of Warranties and Limitation of Liabilities
All information, specifications and illustrations in this manual are based on thelatest information available at the time of printing.
Autel reserves the right to make changes at any time without notice. While
information of this manual has been carefully checked for accuracy, no
guarantee is given for the completeness and correctness of the contents,
including but not limited to the product specifications, functions, and illustrations.
Autel will not be liable for any direct, special, incidental, indirect damages or any
economic consequential damages (including lost profits).
IMPORTANT
Before operating or maintaining this unit, please read this manual carefully,
paying extra attention to the safety warnings and precautions.

For Services and Support:
pro.autel.com
www.autel.com
1-855-288-3587/1-855-AUTELUS (North America)
0086-755-86147779 (China)
support@autel.com
For details, please refer to the Service Procedures in this manual.

iSafety Information
For your own safety and the safety of others, and to prevent possible
electrical shock, fire, or damage to the device, your computer or the MaxiSys
tablet on which it is applied, it is important that the safety instructions hereinpresented throughout this manual be read and understood by all persons
operating, or coming into contact with, the device.
Before using the device, always refer to and follow the safety messages.
Read, understand, and follow all safety messages and instructions in thismanual. Safety protection built in the device may cease to function if thedevice is used incorrectly. This could cause damage to your device, or leadto injury to yourself and others. In addition, follow all generally acceptedsafety practices and procedures for working with and around electricity.

Symbols
These safety and electrical symbols may appear on the product or in thismanual.
Symbols

Description
Direct current.
Alternating current.
Chassis ground terminal.
Device protected throughout by double insulation or
reinforced insulation.
Possibility of electric shock.
Warning.
Static awareness. Static discharge can damage parts.
EN61010 measurement category.
Do not dispose of this product as unsorted municipal
waste.

ii

Safety Messages
Safety messages are provided to help prevent personal injury andequipment damage. All safety messages are introduced by a signal word
indicating the hazard level.
DANGER: Indicates conditions or practices that could result in death orserious injury to the operator or to bystanders.
WARNING: Indicates conditions or practices that could result in damage tothe product or equipment to which it is connected.

Safety Instructions
The safety messages herein cover situations Autel is aware of. Autel cannot
know, evaluate or advise you as to all of the possible hazards. You must be
certain that any condition or service procedure encountered do notjeopardize your personal safety.

Maximum input ranges
Observe all terminal ratings and warnings marked on the product.
DANGER:

To prevent electric shock, operate within the safe input range for thescope, refer to Technical Specifications on page 4.

To prevent electric shock, take all necessary safety precautions whenworking on equipment where voltages above the specified input range
may be present. Contact with voltages outside of the specified
measuring range presents a risk of electric shock.



To prevent injury or death, the oscilloscope must not be directly
connected to the mains (line power). To measure mains voltages, use a
differential isolating probe specifically rated for mains use.

WARNING:

Operation outside of the safe input range is likely to cause permanent
damage to the oscilloscope and other connected equipment.

Grounding
DANGER:

The scope’s ground connection through the USB cable is foriii

measurement purposes only. The oscilloscope does not have aprotective safety ground.


Do not connect the ground input (chassis) to any electrical power source.
To prevent personal injury or death, use a voltmeter to check that there
is no significant AC or DC voltage between the oscilloscope ground andthe point to which you intend to connect it.

WARNING:

Applying a voltage to the ground input is likely to cause permanent
damage to the oscilloscope, the attached computer, and otherequipment.



To prevent measurement errors caused by poor grounding, always use
the high-quality USB cable supplied with the oscilloscope.

External connections
DANGER:

To prevent injury or death, use only the power cord and adaptor
supplied with the product.

Environment
DANGER:

To prevent injury or death, do not use in wet or damp conditions, oraround explosive gas or vapor.

WARNING:

To prevent damage, always use and store your oscilloscope inappropriate environments. For detailed information on temperature andhumidity specifications for both the storage and usage of theoscilloscope, see Technical Specifications on page 4.

Product Maintenance
The product contains no user-serviceable parts. Repair, servicing andcalibration require specialized test equipment and must only be performed
by Autel Tech Support or an approved service provider.
DANGER:

To prevent injury or death, do not use the product if it appears to beiv

damaged in any way, and stop use immediately if you are concerned byany abnormal operations.
WARNING:

Do not tamper with or disassemble the oscilloscope, connectors oraccessories. Internal damage will affect performance.



Do not block any of the instrument’s air vents as overheating will cause
damage to the oscilloscope.

When cleaning the oscilloscope, use wet soft cloth with mild detergent inwater. Do not allow water to enter the oscilloscope casing, as this willcause damage to the electronics inside.

v

CONTENTS
1 USING THIS MANUAL ............................................................................. 1
CONVENTIONS ........................................................................................... 1
BOLD TEXT ................................................................................................ 1
2 GENERAL INTRODUCTION .................................................................... 3
MP408 SCOPE MODULE ............................................................................. 3
ACCESSORY KIT ......................................................................................... 6
3 MAXISCOPE INTRODUCTION ................................................................ 9
INSTALL MAXISCOPE APP ............................................................................ 9
INTRODUCTION ........................................................................................... 9
MAXISCOPE BASICS...................................................................................10
MAXISCOPE FUNCTIONS .............................................................................17
SERIAL PROTOCOL INTRODUCTION ...............................................................31
FREQUENCY DOMAIN SETTINGS ...................................................................44
4 PRODUCT SERVICE..............................................................................50
SERVICE PROCEDURES ..............................................................................50
5 COMPLIANCE INFORMATION ...............................................................53
6 WARRANTY ...........................................................................................54
12-MONTH LIMITED W ARRANTY ...................................................................54vi

1 Using This ManualThis manual contains device usage instructions.
Some illustrations shown in this manual may contain features and optional
equipment that are not included on your system. Contact your sales
representative for availability of other features and optional tools oraccessories.

Conventions
The following conventions are used.

Bold Text
Bold text is used to highlight selectable items such as buttons and menu
options.
Example:

Click OK.

Terminology
The term “select” means highlighting a button or menu item and clicking it toconfirm the selection.

Notes and Important Messages
The following messages are used.

Notes
A NOTE provides helpful information such as additional explanations, tips,
and comments.
A “*” or “**” symbol indicates that a related NOTE is written following thespecific content.

1

Important
IMPORTANT indicates a situation which, if not avoided, may result indamage to the equipment, or the attached computer.

Hyperlinks
Hyperlinks or links that take you to other related articles, procedures, andillustrations are available in electronic documents. Blue italic text indicates a
selectable hyperlink and blue underlined text indicates a website link or anemail address link.

Illustrations
Illustrations used in this manual are samples, and the actual testing screen
may vary for each vehicle being tested. Observe the menu titles andon-screen instructions to make correct option selection.

Procedures
An arrow icon indicates a procedure.
Example:

To install the app
1.

Download the MaxiScope App from www.autel.com > Products >MaxiScope MP408 > Downloads.

2.

Copy the MaxiScope app (for example: ScopeV1.15.apk) to theexternal SD card;

3.

Open the Es File Explorer and find the app (for example:
ScopeV1.15.apk), click it to install.
.

22 General Introduction
The MaxiScopeTM MP408 is a 4-channel automotive oscilloscope. It works in
combination with your MaxiSys Tablet, which turns into a powerful diagnostic
tool, showing you what is really going on with a vehicle’s electronic circuits.
The system can be used to measure and test almost all of the electrical andelectronic components and circuits in any modern vehicles.
Power for the MaxiScope MP408 Module comes directly from the USB portof the connected tablet, so no batteries or power leads are required, making
the system very versatile and portable to use.
This manual describes the construction and operation of the product andhow it works to deliver test results.

MP408 Scope Module
Functional Description

Figure 2-1 Front, Rear, and Top View
1.

USB Port Connector32.

Input Channel A/B/C/D

3.

LED Breath Light – lights up when powered on, blinks whencommunicating, and shimmers when error occurs

4.

Warning Triangle – indicates potential safety hazard that exists on theindicated connections, and appropriate precautions should be taken.
Make sure you read through the Safety Information before using.

5.

Equipotential Symbol – indicates the outer shells of the indicated BNC
connectors are all at the same potential. Therefore, necessary
precautions should be taken to avoid applying a potential through thereturn connections of the indicated BNC terminals, as this may result ina large current flow, causing damage to the product and the connected
equipment.

Power Source
The MaxiScope MP408 Scope Module is powered directly by the USB portof the connected tablet, no batteries or power leads are required, making itsuitable for use both for workshop-based and mobile automotive
diagnostics.

Technical Specifications
Figure 2-2 Specifications
Main Features

Description

Vertical resolution

12 bits

Channels

4

Bandwidth20MHz

Accuracy

1%

Sensitivity

10mV/div to 20V/div

Input Ranges (full scale)±50mV to ±100V in 11 ranges

Input Impedance

1MΩ in parallel with 22pF

Input Type

Single-ended, BNC connector

Input Coupling

Software selectable AC/DC
4

Overload Protection±200V on single input

Maximum Sampling Rate(Single Shot)
1 and 2, or 3 and 4channels in use

20MS/s*1 and 3 or 4, 2 and 3 or 4channels in use

80MS/s

Buffer Memory

32M samples shared among active channels

Waveform Buffer

Up to 1000 waveforms

Timebase Ranges

100ns/div to 1000s/div

Advanced Features

Math channels, Measurements

Triggers

Description

SourceAny input channel

Basic Triggers

Auto, Repeat, Single, None

Advanced Triggers

Rising edge, Falling edge

Environmental

Description

Operating Temp. Range

0 to 50°C (15 to 40°C for quoted accuracy)

Storage Temp. Range-20 to +60°C

Storage Humidity Range

5 to 95%RH, Non-condensing

Physical Characteristics

Description

Dimensions(Protection
rubber case included)

190x115x38 mm

Weight<0.5 kg

GeneralDescription

Tablet Interface

USB 2.0 – cable suppliedPower Requirements

Powered from USB port

Compliance

FCC (EMC), CE (EMC and LVD), RoHS

Warranty

1 year5

NOTE*:
Reduced to 20MS/s if channels A and B, or C and D, are enabled.

Accessory Kit
Supplied Accessories
The table below gives descriptions of the hardware and accessories
supplied with the package.
Figure 2-3 Supplied Accessories
Image

Description & Quantity
1.5m USB Cable - X1
Connects the Scope Module to the computer.
3m (10ft) Screened Test Leads - X4
BNC to 4mm. Connects the Scope Module to a test
probe. Screened to keep out electrical interference.
Secondary Ignition Pickup - X1
For safe probing of HT leads without danger from highvoltages.
2-pin Breakout Lead - X1
For standard 2-pin sensors and actuators. With 4mm
plugs to connect to MaxiScope test leads.
Attenuators 20:1 - X2
Extends the range of the MaxiScope up to ±400V todeal with primary ignition.
Large Crocodile Clip Set - X1 Pair
For hands-free probing of wires and small terminals.
Small Crocodile Clip Set - X1 Pair
For hands-free probing of wires and small terminals.

6ImageDescription & Quantity
Acupuncture Probe Set - X1
For back-probing connectors without cutting or piercing
the insulation. Accepts 4mm plugs.
Multimeter Probes – X1 Pair
For making voltage measurements. Accepts 4mm
plugs.

Supported Accessories
The table below gives descriptions of additional accessories supported by
the MaxiScope. If any of them is needed, please purchase by yourself.
Table 2-1 Supported Accessories
Image

Description & Quantity
HT306 6-Way Universal Breakout Leads
Break into almost any connector up to 6 ways. Accepts
4mm plugs. (4 sizes supplied: 0.6 mm / 1.5 mm / 2.3mm / 2.8 mm)
60cm Spark Plug Extension Lead (With GroundLeads)
Fits between coil pack and spark plug to give access to
the HT lead. Suitable for use with secondary ignition
pickup.
65A Current Clamp
Screened cable with BNC connector to keep out
electrical interference.
650A Current Clamp
Screened cable with BNC connector to keep out
electrical interference.

7

60MHz High-speed Probe For accurate measurementof fast signals like CAN bus and FlexRay. Standard
BNC plug.
Fuse Extension Lead (20A/30A)
In both mini and standard sizes. Plug the original fuseinto the lead; plug the lead in the fuse socket, then use
a current clamp to measure fuse current.

Attenuators
The attenuator supplied with the MaxiScope kit is a small adapter, usuallyconnected to the BNC connectors between the Scope Module and the test
lead; it is used to scale down the voltage input to the scope module when themeasured voltage is likely to exceed 100 volts.
Each channel fitted with an attenuator must be configured using the Probes
Menu. This ensures that the voltages displayed by MaxiScope are correct.
The AC/DC dropdown menu is available on each of the control pane whichallows users to select AC or DC measurements.

8

3 MaxiScope Introduction
This section focuses on the instructions of using the MaxiScope with an
Android tablet (only for some of Autel tools). Make sure to install the
MaxiScope app before connecting the scope module for the first time.
Some illustrations shown in this manual may contain options or functions
that are not included on your system. Contact your sales representative foravailability of these features.

Install MaxiScope App
The MaxiScope App is a processing program that runs on the Android tablet,which presents as an operating interface displaying waveforms and menus,
allowing you to set the testing options, triggers, probe types and various
configurations.


To install the app
1.

Download the MaxiScope App from www.autel.com > Products >MaxiScope MP408 > Downloads.

2.

Copy the MaxiScope app (for example: ScopeV1.15.apk) to theexternal SD card;

3.

Open the Es File Explorer and find the app (for example:
ScopeV1.15.apk), click it to install.

Then you may tap the Oscilloscope icon on the main menu of the MaxiSys
system to start operations.

Introduction
The main purpose of oscilloscope MaxiScope MP408 is to display electronic
signals, transfer electronic signals into waveform curves. By observing the
waveform curves, users can determine whether the electronic component isworking properly. It can be used in a wide range of industries, including
Computer Science, Automotive Electronics, Mobile Phone Manufacture,
Military Aviation, Power Supply and other industries related with electronic9

signals. Below is the layout of the MaxiScope main screen, other functions
will be described in the following sections

Figure 3-1 MaxiScope App Main Screen

MaxiScope Basics
Connection Status Icon
If the MaxiScope is connected to the tablet, a green check will display on thebottom of the Scope icon on the top right of the screen. Otherwise, a red
cross displays.

10Figure 3-2 MaxiScope Connected

Figure 3-3 MaxiScope Disconnected

MaxiScope View Mode
Normal Mode
In Normal Mode, waveforms are captured when the time base is shorter than
200ms/div, and incontinuous between screens.

11

Continuous ModeIn Continuous Mode, waveforms are captured when the time base is longer
than 200ms/div, and continuous between screens.

Figure 3-4 Normal Mode

Figure 3-5 Continuous Mode
From the views displayed on Figure 3-5, we can know that in Continuous
Mode, the data displays on one screen is actually captured in multiple
phases.
12

MaxiScope Channel Status Bar
It shows the ON/OFF status of each channel. Every channel displays in aunique color. The screenshot below shows the views with four channels
open.

Figure 3-6 Views with Four Channels

MaxiScope Channel Setting Bar

Figure 3-7 Channel Settings
13Channel settings: Change channel settings including Amplitude, Probe and
AC/DC settings.
Amplitude range: Set the coordinate range of Y-axis, see  in the image
below.
AC/DC: Alternative current/direct current, see  in the image below.
Probe zoom scale: Set the scale based on the specific probe being used.
Long press  to open the Probe Settings.

Trigger Setting Bar

Figure 3-8 Trigger Settings
Trigger: Used to filter and capture the specified waveform data.
Trigger type: The specified trigger type, it the case above, the trigger type is
Edge Triggering.
Trigger mode: There are four trigger modes: None, Auto, Repeat, andSingle.
1)

None: Capture the data repeatedly and no need to wait for the
waveform for triggering.

2)

Auto: Automatically start to capture data if the triggered waveform is not
captured in a reasonable scale of time.

3)

Repeat: Wait for trigger waveform indefinitely before displaying data.
14

4)Single: Stop to capture data once one waveform is captured.

Trigger threshold: The amplitude of the trigger point.
Trigger edge: Includes Rise and Fall.
1)

Rise: Waveform is triggered on Rise edge.

2)

Fall: Waveform is triggered on Fall edge.

Measurement Rulers

Figure 3-9 Measurement Rulers
Amplitude ruler: Used to measure relative or absolute signals.
Time ruler: Used to measure relative or absolute time.

File
Save as PDF: Save as PDF file.
Save as text: Save as txt file.
Save as XLS: Save as xls file.
Save current page: Save the current page as jpg files.
Save: Save the MSData file.
Open: Open the saved MSData file and turn the saved data into image.
15

Figure 3-10 File Tools

Help
About: Used to check the hardware version number and software version
number and other information about the device.
Check update: Provides software and firmware update. Connect to theinternet to check if new updates are available.

Figure 3-11 Help
16

Figure 3-12 About

MaxiScope Functions
Data Collection Mode
Normal Mode
It is used to connect to the signal source to capture hardware data and view
and waveform. When there is no input signal, the software shows as below.

17Figure 3-13 Normal Mode

Demo ModeIt allows user to use MaxiScope for demonstration when no signal source isconnection. The following image shows the status when no signal source isconnected.

Figure 3-14 Demo Mode18

Auto Setup
Click it to set the range of X-axis and Y-axis, and generally waveforms of 3 to
5 periods will display. The range of X-axis and Y-axis will be set at the sametime, and time base and amplitude can be set manually for waveformviewing.

Figure 3-15 Auto Setup 1
Figure 3-16 Auto Setup 2

19

Start/Stop
Start: Click it to start data collection.
Stop: Click it to stop data collection.

Figure 3-17 Start Screen
Figure 3-18 Stop Screen

Time Base
The time for collect one measurement unit of data.
Normal mode: The time base is shorter than 200ms/div.
Continuous mode: The time base is longer than 200ms/div.

20

Figure 3-19 Time Base Selection

Waveform Cache
It is used to view the waveform records.

Figure 3-20 Waveform Cache

21View Mode
Oscilloscope Mode
It is used with Time Base to set the time of data collection to capture
waveform data.

Figure 3-21 Oscilloscope Mode

Spectrum Mode
It is used with Current Data Collection Frequency to set the frequency andquantity of data collection.

22

Figure 3-22 Spectrum Mode

Trigger Function
Trigger: It is used to filter and capture specified waveform data (Figure 3-20).
The position of the trigger point can be modified by changing the trigger
threshold or the trigger time. Trigger source (channel), trigger mode, trigger
direction, trigger type and trigger threshold can be set by clicking the trigger
mode.

Figure 3-23 Trigger Mode Setting 1
23

Figure 3-24 Trigger Mode Setting 2

Measurement
It is used to calculate the parameters in the currently captured signal anddisplay the signal graph in digitals. As shown in the image below, at most 5
measurements can be displayed at the same time.

Figure 3-25 Measurements
24

Table 3-1 Measurements
Measurements
Maximum

The highest level reached by the signal.

Minimum

The lowest level reached by the signal.

Peak to Peak

The difference between Maximum and Minimum.

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.

Cycle TimeThe time of a signal cycle.

DC Average

The mean value of the waveform.

Duty Cycle

The amount of time that a signal spends above its
mean value, expressed as a percentage of thesignal period.

Falling Rate

The rate at which the signal level falls.

Frequency

The number of cycles of the waveform persecond.

Rising Rate

The rate at which the signal level rises.

Rising TimeThe time the signal takes to rise from the lower
threshold to the upper threshold.

Falling TimeThe time the signal takes to fall from the upper
threshold to the lower threshold.

High Pulse Width

The amount of time that the signal spends aboveits mean value.

Low Pulse Width

The amount of time that the signal spends below
its mean value.

X@Max

The value on the X-axis when the signal on Y-axis
reaches to the maximum value.

25

X@MinThe value on the X-axis when the signal on Y-axis
reaches to the minimum value.

Positive Acreage

The acreage of waveform above the zeroreference in N full-cycle waveforms displayed on
the screen.

Negative
Acreage

The acreage of waveform below the zeroreference in N full-cycle waveforms displayed on
the screen.

Full Acreage

Full positive acreage + full negative acreage

Positive
Ratio

Duty

(Positive pulse width/period)*100%

Negative
Ratio

Duty

(Negative pulse width/period)*100%

Top Value

The voltage value when the waveform top to
ground.

Bottom Value

The voltage value when the waveform bottom toground.

Range

The range from top value to bottom value.

Positive
Overshoot(Local maximum – top value)/amplitude*100%

Negative
Overshoot(Bottom value – local minimum)/amplitude*100%

Positive
Pre-shoot(Bottom value – local minimum)/amplitude*100%

Negative
Pre-shoot(Local maximum – top value)/amplitude*100%

MaxiScope Menu Bar
Print
Connect the tablet to a printer via PC or connect the tablet to a Wi-Fi printervia a Wi-Fi printing app.
26

Tap the Print button, the current screen will be printed as images.

Figure 3-26 Print

Settings
Tap this button to select and set parameters for math channel, serial
decoding and frequency domain.

Figure 3-27 Settings 1

27

Figure 3-28 Settings 2

Mathematic Calculation
Math Channel: Operates some basic calculations on the captured data.
Currently, only the data from Channel A and B can be processed and at
most 4 calculations can be conducted at the same time.

Figure 3-29 Mathematic Calculation 1

28

Figure 3-30 Mathematic Calculation 2
NOTE
Currently, Sqrt, Abs, Sin, Cos and Tan only support calculations on Channel
A data.

Serial Decoding
Decode data from a serial bus, including CAN, LIN, FlexRay, UART/RS232,
I2C, SPI, I2S and USB.

Figure 3-31 Serial Decoding 1
29

Decoding setting dialog contains three parts: protocol, protocol settings anddisplay setting.
Protocol: There are three options in this table: Channel, Protocol andEnable.
Protocol settings: Set Baud Rate (protocol related), Threshold (fordistinguishing high and low electrical levels) and Advanced Settings(protocol related) in this section.
Display settings: Set display format of data in the table.

Figure 3-32 Protocol Settings 130

Figure 3-33 Protocol Settings 2

Serial Protocol Introduction
CAN Protocol
CAN (Controller Area Network) is a serial protocol used in automotive andindustrial machinery, which allows microcontrollers communicating witheach other. MaxiScope can decode CAN_H and CAN_L signals.
Threshold: It is the median between high and low logical electrical levels. It
is recommended to set the waveform median as the threshold, or manually
adjust this value according to actual condition.
Baud rate: The transmission speed of CAN bus. This value should be set tomatch the data bus transmission speed.
Display settings: Set the display format of the view.

31

Figure 3-34 CAN Protocol Settings 1

Figure 3-35 CAN Protocol Settings 2

CAN Protocol Data List
Number (No.): The serial number of frames (decimal). It indicates the CAN
protocol frame number that currently decoded.
Frame ID: Identifier (hexadecimal). It is unique for specific data type, thebase frame has an 11-bit identifier, and the extended frame has a 29-bit
identifier.
RTR: Remote transfer request.
SRR: Used only in extended frame.
IDE: Extended frame identifier.
R0: Reserved bit.
R1: Reserved bit, only for extended frame.

32

DLC: Data length code. It indicates the number of data bytes.
Data byte: Data content of the packet, DLC byte length (hexadecimal).
CRC sequence: Data cyclic redundancy check (hexadecimal).
CRC delimiter: The fixed bit after the CRC sequence field.
ACK: Node asserts this bit to acknowledge receipt.
ACK delimiter: The fixed bit after ACK field.
Start time: The value of the time base when the frame starts.
End time: The value of the time base when the frame ends.

LIN Protocol
LIN (Local Interconnect Network) is a serial protocol used in automotive
electronics to allow microcontrollers to communicate with low-speed
peripherals.
Threshold: Used to distinguish the voltage values between high and low
logic electrical levels.
Baud rate: Data transmission speed that LIN protocol set in the device.
Display setting: Set the display format of the view.

Figure 3-36 LIN Protocol Settings 1
33

Figure 3-37 LIN Protocol Settings 2

LIN Protocol Data List
Number (No.): The serial number of frames (decimal). It indicates the LIN
protocol frame number that currently decoded.
Break: An indicator for frame starting.
Sync: A fixed value (0x55) used for automatic baud rate detection.
Frame ID: Six-bit value of the data type carried by the identification frame.
Data count: The number of bytes of the data in the frame.
Data byte: The data content of the packet.
Checksum: A cyclic redundancy check of the data (hexadecimal).
Start time: The value of the time base when the frame starts.
End time: The value of the time base when the frame ends.

FlexRay Protocol
FlexRay is an automotive network communications protocol for high-speed
data. It is designed to be fault-tolerant.
Threshold: Used to distinguish the voltage values between high and low
logic electrical levels.
Baud rate: Data transmission speed that FlexRay protocol set in the device.
Display setting: Set the display format of the view.

34

Figure 3-38 FlexRay Protocol Settings 1

Figure 3-39 FlexRay Protocol Settings 2

FlexRay Protocol Data List
Number (No.): The serial number of frames (decimal). It indicates the
FlexRay protocol frame number that currently decoded.
TSS: Transmission starting signal. The frame is bit 0.
FSS: Frame starting signal. The frame is bit 1.
BSS: Byte starting signal. It is a fixed 2-bit code.
Reserved bit: Undefined.
Payload preamble indicator: Indicates the presence of a network
management vector or message ID.
Null frame indicator: Indicates that the payload contains no useful payload
data.

35

Sync frame indicator: Indicates whether the frame is a synchronization
frame.
Frame ID: Defines the slot in which the frame is transmitted.
Payload length: The number of payload bytes divided by 2.
Header CRC: Cyclic redundancy check of data from the sync frame indicator
to the payload length.
Cycle count: Cycler counter.
Payload: 0-254 bytes of the data.
Payload CRC: Frame CRC.
FES: Frame ending signal.
Start time: The value of the time base when the frame starts.
End time: The value of the time base when the frame ends.

UART/RS232 Protocol
RS232 is the serial data standard used by serial or COM ports UART once
commonly found on computers. The full standard uses a voltage range of±12V. The simplest RS232 connection contains two signals: RX (Receive)
and Tx (Send).
Threshold: Used to distinguish the voltage values between high and low
logic electrical levels.
Baud rate: Data transmission speed that UART/RS232 protocol set in thedevice.
Display setting: Set the display format of the view.

36Figure 3-40 UART/RS232 Protocol Settings 1

Figure 3-41 UART/RS232 Protocol Settings 2

UART/RS232 Protocol Data List
Number (No.): The serial number of frames (decimal). It indicates the
UART/RS232 protocol frame number that currently decoded.
Packet: All packet in this form are classified as data.
Start bit: A fixed bit of 1-bit.
Data byte: The content of the packet.
Parity byte: Error-checking bit at the end of the byte (if available).
End byte: 1-2 bits at the end of the byte.
Start time: The value of the time base when the frame starts.
End time: The value of the time base when the frame ends.

37

SPI Protocol
SPI (Serial Peripheral Interface) bus is the serial data standard for thecommunications between microcontrollers and peripherals. It originally used
4-line links, 3-line and 2-line links are also in application, MaxiScope uses
3-line link to analyze this protocol.
CLK: Indicates the channel connected to clock signal.
Clock threshold: Used to distinguish the voltage values between high andlow logic electrical levels of the clock signal.
DATA: Indicates the channel connected to data signal.
Data threshold: Used to distinguish the voltage values between high andlow logic electrical levels of the data signal.
SEL: Indicates the channel connected to chip select signal.
Chip select threshold: Used to distinguish the voltage values between highand low logic electrical levels of the chip select signal.

Figure 3-42 SPI Protocol Settings 1

38

Figure 3-43 SPI Protocol Settings 2

SPI Protocol Data List
Number (No.): The serial number of frames (decimal). It indicates the SPI
protocol frame number that currently decoded.
Packet: Packet types: start, end, address, data and undefined.
Start bit: The content of the packet.
Start time: The value of the time base when the frame starts.
End time: The value of the time base when the frame ends.

I2S Protocol
I2S (Inter-IC Sound) is a serial protocol used in digital audio devices forcommunications between circuits such as CD transports and audio DACs. It
uses three signals: clock (SCK), word select (WS) and data (SD).
SCL: Indicates the channel connected to clock signal.
Clock threshold: Used to distinguish the voltage values between high andlow logic electrical levels of the clock signal.
SDA: Indicates the channel connected to data signal.
Data threshold: Used to distinguish the voltage values between high andlow logic electrical levels of the data signal.
WS: indicates the channel connected to word select (WS) signal.

39

WS threshold: Used to distinguish the voltage values between high and low
logic electrical levels of the chip select (WS) signal.

Figure 3-44 I2S Protocol Settings 1

Figure 3-45 I2S Protocol Settings 2

I2S Protocol Data List
Number (No.): The serial number of frames (decimal). It indicates the I 2S
protocol frame number that currently decoded.
Packet: All packet in this form are classified as data.
Start bit: The content of the packet.
Start time: The value of the time base when the frame starts.
End time: The value of the time base when the frame ends.
40

I2C Protocol
I2C (Inter-Integrated Circuit) is a serial protocol used in consumer electronics
for communications between components on the same electric board andbetween computers and monitors. It uses two signals: clock (SCL) and data
(SDA).
SCL: Indicates the channel connected to clock signal.
Clock threshold: Used to distinguish the voltage values between high andlow logic electrical levels of the clock signal.
SDA: Indicates the channel connected to data signal.
Data threshold: Used to distinguish the voltage values between high andlow logic electrical levels of the data signal.

Figure 3-46 I2C Protocol Settings 1

Figure 3-47 I2C Protocol Settings 2

41

I2C Protocol Data List
Number (No.): The serial number of frames (decimal). It indicates the I2C
protocol frame number that currently decoded.
Packet: Packet types: start, end, address, data and undefined.
Address: Shown for address packets.
R/W: Polarity of the read/write flag.
Data byte: The content of the packet.
ACK: Whether the address confirms the packet.
Start time: The value of the time base when the frame starts.
End time: The value of the time base when the frame ends.

USB Protocol
All USB (Universal Serial Bus) data communications (both uplinkcommunication and downlink communication) are launched by the USB host,therefore the USB host dominates the whole data transmission process.
Only one host can exist in the USB system.
D-: Indicates the channel connected to data signal.
Clock threshold: Used to distinguish the voltage values between high andlow logic electrical levels of the clock signal.
D+: Indicates the channel connected to data signal.
Data threshold: Used to distinguish the voltage values between high andlow logic electrical levels of the data signal.

42

Figure 3-48 USB Protocol Settings 1

Figure 3-49 USB Protocol Settings 2

USB Protocol Data List
Number (No.): The serial number of frames (decimal). It indicates the USB
protocol frame number that currently decoded.
Sync: An 8-bit preamble for each data packet to synchronize the packet
transmission rate of the USB device with the bus. The value has a fixed bit
00000001.
43

PID field: Used to indicate the packet type, including token, data, handshakeand special.
Data field: Used to carry the information to be transited between the hostand the device. The content and length vary by identifier and transmission
type. In the USB packet, the data segment may contain the device address,
endpoint number, frame serial number, data and other content.
CRC: The number of bits in CRC data vary by packet type. Important datauses CRC16 data field while others use CRC5.
Start time: The value of the time base when the frame starts.
End time: The value of the time base when the frame ends.

Frequency Domain Settings

Figure 3-50 Frequency Domain Settings
Generally, the default configuration works for most applications, but
occasionally the two highlighted part in the above image need to be
configured as well.
Spectrum bins: The number of frequency bins into which the spectrum isdivided. It is used to set the maximum number of frequency bins, which thesoftware may or may not be able to provide depending on other settings.
The main constraint is that the number of the windows cannot exceed half44the number of samples in the source waveform. If the source waveform
contains fewer samples that required (that is, fewer than twice the number ofthe frequency bins), then MaxiSope will zero-pads the waveform up to thenext power of two. For example, if the scope view contains 10,000 samples,and you set Spectrum Bins to 16,384, then MaxiScope zero-pads the
waveform to 16,384 samples, which is the nearest power of two above
10,000. It then uses 16,384 samples to provide 8192 frequency bins, not the
16,384 requested. If the source waveform contains more samples that
required, then MaxiScope uses as many samples as necessary, startingfrom the beginning of the waveform buffer. For example, if the source
waveform contains 100,000 samples and you request 16,384 frequency bins,
MaxiScope needs only 2 x 16,384 = 32,768 samples, so it uses the first
32,768 samples from the waveform buffer and ignore the rest.
Window Function: Allows you to choose one standard window function to
reduce the effect of operating on a time-limited waveform.
Table 3-2 Window Function
Window

Main peakwidth(bins @-3dB)

Highestside lobe(dB)

Side loberoll-off(dB/octav
e)Remarks

Blackman

1.68

-58

18

Often used for audio
work

Gaussian

1.33 to1.79-42 to -69

6Gives minimal timeand frequency errors

Triangular

1.28

-27

12

Also called Bartlett
window

Hamming

1.30

-41.9

6

Also called raised
sine-squared; usedin speech analysis

Hann

1.20 to1.86-23 to -47

12 to 30

Also called
sine-squared; used
for audio andvibration work

45

BlackmanHarris

1.90

-92

6

General-purpose

Flat-top

2.94

-44

6

Negligible pass-band
ripple; used mainly
for calibration

Rectangul
ar

0.89

-13.2

6

No fading; maximal
sharpness; used forshort transients

Display mode: The current version only support importance.
Logarithmic unit: Indicates the logarithmic unit used on Y-axis.

Sampling Frequency Setting

Figure 3-51 Sampling Frequency Setting
It is recommended to use twice the signal frequency (s) as the sampling
frequency (fs) to ensure the sampling theorem is met without causing
distortion and also eliminate unnecessary noise.

Spectrum Measurements

46

Figure 3-52 Spectrum Measurements
Frequency at peak: The frequency at which the peak signal value appears.
Amplitude at peak: The amplitude of the peak signal value.
Average amplitude at peak: The amplitude of the peak signal value
averaged over a number of captures.
Total power: The power of the whole signal captured in the spectrum view,
calculated by adding the powers in all spectrum bins.
Total harmonic distortion (THD)%: The ratio of the sum of harmonic
powers to the power at the fundamental frequency.

THD =√V12 + V22 + V32 + V42 + V52
VfTotal harmonic distortion dB (THD): The ratio of the sum of harmonic
powers to the power at the fundamental frequency.
√V12 + V22 + V32 + V42 + V52

THD = 10log10
(

Vf

)

47

Total harmonic distortion plus noise (THD+N): The ratio of the harmonic
power plus noise to the fundamental power. The THD+N values are always
greater than the THD values for the same signal.
THD + N = 10log10 (THD + N)
Vf

Spurious-free dynamic range (SFOR): This is the ratio of the amplitude of
specific point (generally, the highest peak) in the spectrum to that of thesecond highest peak (it is called the SFDR frequency). SFDR frequency is
not necessarily a harmonic of the fundamental frequency. For example, it
might be a strong, independent noise signal.
Signal to noise and distortion ratio (SINAD): The ratio, in decibels, of thesignal-plus-noise-plus-distortion to noise-plus-distortion.
SINAD = 10log10 (Signal)Noise + noise

Signal to noise ratio (SNR): The ratio, in decibels, of the signal to noise.
Hanning or Blackman windows are recommended because of their low
noise.
SINAD = 10log10 (Signal)NoiseIntermodulation distortion (IMD): A measure of the distortion caused by
the nonlinear mixing of two tones. When multiple signals are injected into a
device, modulation or nonlinear mixing of these two signals can occur. For
input signal at frequencies f1 and f2, the two second-order distortion signals
will be found at frequencies: f3 = (f1 + f2) and f4 = (f1 – f2). IMD is expressedas the dB ratio of the RMS sum of the distortion terms to the RMS sum of thetwo input tones. IMS can be measured for distortion terms of any order, but
the second-order terms are most commonly used. In the second-order case,the intermodulation distortion is given by:
F32 + F42
IMD = √ 2
F1 + F22
Where F3 AND F4 are the amplitudes of the two second-order distortion
terms (at frequencies f3 and f4 defined above) and F1 and F2 are theamplitudes of the input tones (at frequencies f1 and f2, as marked by the48

frequency rulers in the spectrum window). For reference, the third-orderterms are at frequencies (2F1 + F2), (2F1 – F2), (F1 + 2F2) and (F1 – 2F2).
NOTE
Hanning or Blackman windows are recommended because of their low noise.
An FFT size of 4096 or greater is recommended in order to provide
adequate spectral resolution for the IMD measurements.

49

4 Product Service
This section introduces information for technical support, repair service, andapplication for replacement or optional parts.

Service ProceduresThis section introduces information for technical support, repair service, andapplication for replacement or optional parts.

Technical Support
If you have any question or problem on the operation of the product, pleasecontact us.
AUTEL NORTH AMERICA

Phone: 855-AUTEL-US (855-288-3587) Monday-Friday 9am-6pm EST

Website: www.autel.com



Email: ussupport@autel.com

Address: 175 Central Avenue, Suite 200, Farmingdale, New York, USA
11735

AUTEL EUROPE


Phone: 0049 (0) 61032000522

Website: www.autel.euEmail: sales.eu@autel.com, support.eu@autel.com

Address: Robert-Bosch-Strasse 25, 63225, Langen, Germany

AUTEL CHINA HQPhone: 0086-755-86147779

Website: www.autel.com



Email: support@autel.com

Address: 6th-10th floor, Building B1, Zhiyuan, Xueyuan Road, Xili,
Nanshan, Shenzhen, 518055, China.

AUTEL SOUTH AMERICA
50



Phone: (+507) 308-7566

Website: www.autel.com/es



Email: sales.latin@autel.com, latsupport@autel.com

Address: Office 103, Building 3845, International Business Park,
Veracruz, Panamá Pacífico, Panamá

AUTEL AUSTRALIA

Phone: 03 9480 2978 / +61 476293327

Website: www.autel.com.au



Email: sales@autel.com.au

Address: 155 Islington Street, Melbourne, Collingwood, VIC 3066

For technical assistance in other markets, please contact your local selling
agent.

Repair Service
If it becomes necessary to return your device for repair, please download therepair service form from www.autel.com, and fill in the form. The following
information must be included:
Contact name

Return addressTelephone numberProduct name

Complete description of the problem



Proof-of-purchase for warranty repairsPreferred method of payment for non-warranty repairs

NOTE
For non-warranty repairs, payment can be made with Visa, Master Card, orwith approved credit terms.
Send the device to your local agent, or to the below address:
6th-10th Floor, Building B1, Zhiyuan, Xueyuan Road, Xili, Nanshan,
Shenzhen, 518055, China

51

Other Services
You can purchase the optional accessories directly from Autel’s authorized
tool suppliers, and/or your local distributor or agent.
Your purchase order should include the following information:
Contact information

Product or part name

Item description

Purchase quantity52

5 Compliance Information
FCC ComplianceThis equipment has been tested and found to comply with the limits for aClass B digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generates uses and can radiateradio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particularinstallation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one ormore of the following measures:Reorient or relocate the receiving antenna.

Increase the separation between the equipment and receiver.

Consult the dealer or an experienced radio/TV technician for help.

This device complies with part 15 of the FCC Rules. Operation is subject tothe following two conditions:(1) This device may not cause harmful interference, and(2) This device must accept any interference received, including interference
that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.

53

6 Warranty
12-Month Limited Warranty
Autel Intelligent Technology Corp., Ltd. (the Company) warrants to theoriginal retail purchaser of the MaxiScope MP408, that should this product or
any part thereof during normal consumer usage and conditions, be provendefective in material or workmanship that results in product failure withintwelve (12) months period from the date of delivery, such defect(s) will be
repaired, or replaced (with new or rebuilt parts) with Proof of Purchase, at
the Company’s option, without charge for parts or labor directly related to thedefect(s).
The Company shall not be liable for any incidental or consequential
damages arising from the use, misuse, or mounting of the device. Somestates do not allow limitation on how long an implied warranty lasts, so theabove limitations may not apply to you.

This warranty does not apply to:a)

Products subjected to abnormal use or conditions, accident,
mishandling, neglect, unauthorized alteration, misuse, improper
installation or repair or improper storage;b)

Products whose mechanical serial number or electronic serial number
has been removed, altered or defaced;c)Damage from exposure to excessive temperatures or extreme
environmental conditions;d)Damage resulting from connection to, or use of any accessory or otherproduct not approved or authorized by the Company;e)

Defects in appearance, cosmetic, decorative or structural items such as
framing and non-operative parts.

f)

Products damaged from external causes such as fire, dirt, sand, battery
leakage, blown fuse, theft or improper usage of any electrical source.

54

IMPORTANT
All contents of the product may be deleted during the process of repair. You
should create a back-up copy of any contents of your product before
delivering the product for warranty service.

55