AUTOOL DM303 Auto Diagnostic Multimeter User Manual

AUTOOL DM303 Auto Diagnostic Multimeter

Product Information

Specifications

• Product Name: Auto Diagnostic Multimeter
• Compliance: GB4793.1, IEC61010 Safety Standards
• Double insulation, overvoltage standards: CATII1000V, CATIII600V
• Pollution Level: 2

Product Usage Instructions

Cautions and Safe Operation Guidelines
Before using the auto diagnostic multimeter, carefully read the entire manual, paying special attention to the safety precautions mentioned.

Inspection Before Use

1. Check the insulation layer of the probe for any damage or breakage before use.
2. Inspect the instrument shell for any visible damage.
3. Do not use the instrument if you suspect it cannot function correctly.

Safe Operation Practices

1. When using a probe, ensure your fingers are behind the finger protection ring.
2. Do not expose the instrument to voltage exceeding 1000Vrms to prevent electric shock and damage.
3. Exercise caution when measuring voltages higher than DC60V and 42Vrms.
4. Do not cover the rear cover of the instrument before use to avoid electric shock risks.
5. Do not exceed regulated limit values when measuring signals to prevent electric shock and damage.

Additional Guidelines

1. Do not use current to test terminals or voltage at the current gear setting.
2. The instrument has a self-recovery fuse; do not alter its internal wiring to avoid damage and safety hazards.

Frequently Asked Questions (FAQ)

• What safety standards does the auto diagnostic multimeter comply with?
  The multimeter is designed according to GB4793.1 and IEC61010 Safety Standards, featuring double insulation and overvoltage standards of CATII1000V and CATIII600V.

• Can I change the internal wiring of the instrument?
  It is strongly advised not to alter the internal wiring of the instrument as it may lead to damage and safety risks due to the presence of a self- recovery fuse inside.

CAUTIONS
Safe operation guidelines
For the correct use of the instrument, please read the full text of this manual carefully before use, especially the “safety precautions”.

• The automobile diagnostic multimeter is designed and produced in strict accordance with GB4793.1 Safety Require-ments for Electronic Measuring instruments and IEC61010 Safety Standard, and conforms to double insulation, overvolt-age standards (CATII1000V, CATIII600V) and safety standards of pollution level 2. Please operate the instrument according to usage instructions in the Manual; otherwise, it might weaken or lose protection function of the instrument.
• Before use, check that the insulation layer of the probe is intact without damage or breakage. If any obvious damage to insula-tion of probe or instrument shell, or you believe that the instru-ment cannot work normally, please do not use the instrument any more.
• While using a probe, put your fingers behind its finger protec-tion ring.
• Do not apply voltage above 1000Vrms between instrument terminal and grounding terminal to prevent electric shock and instrument damage.
• In case of measured voltage higher than DC60V and 42Vrms, be careful to prevent electric shock.
• Before covering up the rear cover of the instrument, it is strictly forbidden to use the instrument; otherwise there will be risks of electric shock.
• Measured signals are not allowed to exceed the regulated limit value to prevent electric shock and instrument damage.
• It is not allowed to use current to test terminals or voltage at current gear.
• A self-recovery fuse is used inside the instrument. Do not change the internal wiring of the instrument to avoid damaging the instrument and endangering safety.
• When the battery symbol is shown in red on the LCD, the battery should be replaced timely to ensure the measurement accuracy.
• Do not operate the instrument in the high temperature, high humidity environment. Especially, do not store the instrument in the wet environment, as the instrument performance may deteriorate if being wetted.
• Clean the instrument enclosure with a wet cloth and a gentle detergent, and do not use abrasive agents or solvents.

PRODUCT INTRODUCTION

Overview

• The automobile diagnostic multimeter is a hand-held new diagnostic oscillometric multimeter integrating digital oscillo-scope, digital multimeter, automobile circuit and automobile signal inspection, which is designed with the embedded digital control technology.
• The multimeter mode can measure the AC / DC voltage and current, resistance, diode forward voltage drop, on-off and frequency.
• Oscilloscope mode is a complete intelligent measurement system, which includes signal input, data sampling, data processing and automatic search, with the waveform test bandwidth of 500KHZ. With a variable sampling frequency, the slowly varying signal amount can be measured. It is applicable to measuring and observing various signals on the automobile circuit during the car overhaul, including the motor drive signal and motor power voltage of new energy vehicle, fuel car engine ignition pulse signal, camshaft signal, crankshaft signal, wheel speed sensor signal, oxygen sensor signal and so on;
• Car circuit detection can online test the low voltage circuit, prompt high voltage or line leakage and output the power supply voltage. It can also output the power voltage to test the parts of the car, or lower the voltage to drive the parts of the car, such as lights; Test the battery voltage when the oil-fueled vehicle starts, and judge whether the vehicle starting system and the battery are in good condition;
• The analog signal output can be applied to the car ECU detec-tion and can simulate the square wave and sine wave output and simulate the fuel injection signal to drive the fuel injection nozzle; Check the data signal K line and CAN bus signal in the vehicle.

Composite indicator
The multimeter function and the oscilloscope function are integrated together on the instrument. When measuring the voltage signal using a probe, switch to the oscilloscope function with [Fn] key to facilitate the use and observation of signal wave-form.

• LCD is a 2.8-inch color screen, with a resolution of 320*240;
• Input impedance for the voltage measurement: it is 2~3MΩ when the voltage is lower than 160V; it is 10MΩ when the voltage is higher than 160V. The maximum input voltage is 1000Vpp; The analog bandwidth is 500KHz; The voltage range is converted automatically;
• The 10A terminal fuse for current measurement is 15A self-re-covery fuse, and the maximum measurable current is 20A; The current measurement mA/uA terminal fuse is 0.5A self-recov-ery fuse, and the maximum measurable current is 200mA;
• Working temperature: 0~40°C(32~104°F) Humidity: ≤75%;
• Storage temperature: 10~50°C(14~122°F) Humidity: ≤70%;
• Altitude: 2000m.

PRODUCT STRUCTURE

Structure diagram

G

| Diode, voltage, resistance, frequency measurement input|

H

|

Lighting lamp

I| DB15 interface|  |

Button function

A

|

Power key

| Press for power-on, press for about 0.3 seconds to turn off the power when it is on, and long press 3 seconds to reset the instrument.
---|---|---
B| HOLD| Pause Hold / Measurement key.
C| Direction button| Select the functional items.
D| ESC| Return key.
E| OK| Enter key.
F| Fn| Measurement mode switch key.
G| F2| Function keys, defined by the test function.
H| ZERO / F1| Function key, quick reset setting, or defined by test function.
I| Lighting key| Press the light on / off.

Cable number

Cable Number

Name| NO.| Distribution Head No.| Functions

Multi-functional detection line

| ****

C01

| ****

C01 – 1

| DC connector, connected to the battery clip line
C01 – 2| Terminals for injector test and

Automobile relay test

C01 – K| K line signal line
C01 – CAN+| CAN+ signal line
C01 – CAN-| CAN- signal line
C01 – GND| Ground wire
C01 – SIN| Sine wave signal line
C01 – S1| 5V signal line
C01 – S2| Square signal line
Battery clip line| C02|  |
Ignition pulse signal detection line| ****

C03

|  | Sensing high-voltage line signal
Automotive circuit detection line| ****

C04

| ****

C04 – 1

| DC connector, connected to the battery clip line
C04 – 2| Probe terminal
Jumper(Black)| C05|  |
Jumper(Green)| C06|  |
Jumper(Yellow)| C07|  |

OPERATIONS INSTRUCTION

Functional operation guidelines

• The instrument is equipped with a power switch and the automatic sleep function. The automatic sleep time can be set to 1-30 minutes. The key tone of the instrument can be set to turn on and off, but the warning tone cannot be turned off. The brightness of the screen can be set. The brightness can be set according to the actual operation environment, and the battery time can be extended by appropriately lowering the brightness.
• The help function of the instrument provides a brief operation description.
• The instrument is configured in one or more languages according to the sales area. Please contact your local dealer for different languages.
• After turning on the power supply, according to the displayed icon, use the [up / down / left / right] direction keys to move the current option, and press [OK] to enter the function item.

Voltage measurement

• Insert the red probe into the “V” jack and the black probe into the “COM” jack;

• Enter the function item, displayed as shown below:

• The current measured value is displayed. If the voltage fluctuates, press the [HOLD] key to maintain the display status. If there is no voltage signal, the displayed value is non-zero, the red and black probe can be shorted, and press the [F1] key at the same time to perform the quick zeroing operation. [F2] key is used to remove the induction power at the measurement point. Press [F2] key during the measurement, which is equivalent to a 10K resistance connected the red and black probe. This function is suitable for detecting the induction voltage of the new energy vehicle. Press [Fn] key to switch to the AC voltage measurement and the oscilloscope mode to observe the signal waveform; In the voltage measurement or oscilloscope mode, the range is automatically converted, and the maximum measurable voltage signal is 1000V;

• In the voltage measurement mode, the probe only inputs signal, but no pulse signal, without interference to the measured point.

Oscilloscope

• Insert the red probe into the “V” jack and the black probe into the “COM” jack. The instrument does not have a dedicated BNC interface. The oscilloscope is used as an expanded function of voltage signal detection, which greatly facilitates user operation and is particularly suitable for vehicle maintenance.

• Enter the function item, displayed as shown below:

• Display the current signal waveform, 5V/grid – display the voltage scale value, and press the [up] and [down] keys to change during measurement; 1ms-scan time scale value; during measurement, press the [left] and [right] keys to change; Trigger+01 – displays the correction value of the trigger level, which can be changed by pressing [F1 / F2]. The trigger level is the average value of the current waveform automatically calculated. The positive value of trigger correc-tion indicates the increase value of trigger level correction, and the negative value of trigger correction indicates the decrease value of trigger level correction;

• Press the [HOLD] button to pause the display of the waveform. When the waveform is suspended, the [up / down / left / right] keys can be used for the left and right movement control of the waveform, so as to facilitate the comparison and observation of the waveform.

• In the process of voltage signal measurement, the instrument automatically changes the range and the maximum measur-able voltage signal is 1000V;

Current measurement

• Measure the current below 200mA, insert the red probe into the green “mAuA” jack, and insert the black probe into the “COM” jack;
• Measure the current above 200mA, insert the red probe into the yellow “A” jack, and insert the black probe into the “COM” jack;

• Enter the function item, displayed as shown below:

• The current measured value is displayed. If the current fluctu-ates, press the [HOLD] key to maintain the display status. If there is no current signal, the displayed value is non-zero, the red and black probe can be shorted, and press the [F1] key at the same time to perform the quick zeroing operation. [F2] key is used to switch the large current measurement, [Fn] key is used to convert measurements of DC current and AC current.

• Press [F2] key and switch to detect high current mode as shown below:

• In the high current mode, the maximum measurable current is 20A and the maximum measurable continuous current is 10A. There is 15A 30V self-recovery fuse inside, which can protect the instrument from damage due to excessive current in the use of vehicle detection. However, the detection of current in 220V / 380V strong current circuit cannot prevent damage caused by excessive current, and cannot exceed the measur-able current range during use.

Resistance test

• Insert the red probe into the “Ω” jack and the black probe into the “COM” jack;

• Enter the function item, displayed as shown below:

• The instrument detection resistance and the diode are two-in-one function display. Press [Fn] key to switch the display mode. When measuring the resistance, the resistance can be set as the main display; when measuring the diode, the diode can be set as the main display; As shown in the following figure:

• The resistance value displayed is the resistance value when measuring the resistance, and the voltage value displayed is the pressure drop value when measuring the diode. Connect the red and black probe, and press [F1] key for zeroing. If the resistance is excessive low, the instrument will give a sound prompt.

Automotive circuit test

• Insert the special wire for automobile circuit into the multi-func-tional interface (top of the machine), connect the battery clip line, clamp the red clip on the positive plate of the automobile battery, clamp the black clip on the negative plate of the automobile battery, and use the probe to detect the automobile circuit. During the detection process, the probe will send a test signal to detect the electric leakage of the circuit.

• Enter the function item, displayed as shown below:

• Connecting the battery for power supply, the instrument will obtain the external power;

• The instrument displays the current probe voltage value and the voltage value of the power clip;

• Insert the probe into the COM port of the instrument, showing the voltage is zero; if not zero, press [F1] key to zero;

• Detect the circuit on the automobile using a probe, showing the current detection voltage. If the voltage is a constantly chang-ing signal, press [Fn] key to enter the oscilloscope for observa-tion; if the detected voltage is lower

• than 0.7V, the instrument will automatically detect the leakage; if the figure with blue background is displayed and there is a sound prompt, it indicates that the circuit resistance to ground is lower than 10K. If the circuit is insulated to ground, it indicates that the circuit has leakage, as shown in the following figure:

• If the detected voltage is very high and close to the power supply voltage, the instrument will display a number on the red background with a sound prompt, indicating that the circuit voltage is high, which may be a power supply line. If it is an insulated line, it indicates that the line is leaking to the power supply, as shown in the following figure:

• Probe power supply function on instrument line: Press the [up] function key, and the probe outputs the power supply voltage;

• Probe grounding function on instrument line: Press the [down] function key, and the probe is short circuited to the negative pole of the power supply;

• Test function of automotive electrical appliances: The instru-ment outputs a power supply voltage value through the probe to drive the automobile electrical appliances to work. It judges whether the electrical appliances are damaged by observing whether the electrical appliances are working, or drive the automobile electrical appliance through short connecting the special probe to the negative pole, and then judge whether the electrical appliance is damaged by observing whether the electrical appliance is working. For example, check whether the turn signal is intact and use the probe to detect the current voltage value of the two leads of the lamp. If both lines are close to zero voltage, connect the probe to one line, press the up key of the instrument, and observe whether the lamp is on. If it is not on, replace it with another line. If the lamp is normal, one line will turn on the lamp when it is powered. If both lines cannot turn on the lamp when it is powered, the lamp is damaged.

Car start-up test

• Insert the multi-function detection line into the multi-function interface (the top of the machine), connect the battery clip line, clamp the red clip on the positive plate of the car battery, clamp the black clip on the negative plate of the car battery, and turn off the car engine;

• Enter the function item, displayed as shown below:

• At this point, start the engine and wait for 15 seconds, as shown below:

• During the vehicle start process, the minimum battery voltage is detected above 9.6V, indicating the normal state. If the lowest voltage is below 9.6v, indicating the low voltage. The possible reasons for low voltage are battery aging, large mechanical flow, etc. It is necessary to further check the corre-sponding components, among which battery aging is the most important reason.

Injector test

• The instrument can directly drive the injector for testing, and can also detect the real-time injector signal of the vehicle;
• Insert the multi-function detection line into the multi-function interface (top of the machine), connect the battery clip line, clamp the red clip on the positive plate, clamp the black clip on the negative plate, and connect the removed injector to the multi-function line, as shown in the figure below:

• Enter the function item, displayed as shown below:

• When first entering the function interface, there is no drive signal output, so press [OK] to output the injector drive signal. It can test the electromagnetic injector, including GDI injector. When it cannot drive 120V injector, a slight sound may be heard.

• Press [OK] to stop or start the injector working.

• The simulation speed may be adjusted with [up / down / left / right] keys. At all speeds, the analog drive signal is a 3mS low-voltage pulse.

• The injector drives a signal pulse width of 3ms;

• Press [Fn] key to turn to the oscilloscope display mode, insert the red probe into V jack, and connect the injector pin with the red probe to observe the working waveform of the injection nozzle. At this time, the fuel injection drive and the oscillo-scope function are running simultaneously.

• Without connecting the fuel injector, press [Fn] key to switch to the oscilloscope display mode, which can also detect the operating waveform of the fuel injector during vehicle opera-tion. It is necessary to insert the red probe into the V jack, the black probe into the COM jack, the black probe touch the body ground or battery negative, and the red probe touch the connection line of the fuel injector.

Automobile relay test

• Insert the multi-functional detection line into the multi-function-al interface (top of the machine), connect the battery clip line, clamp the red clip on the battery positive plate and the black clip on the battery negative plate. The red clip of the C01-2 transfer line is clamped at the bottom of a coil of the relay, the black clip is clamped on the bottom of the other coil of the relay, insert the red probe into the Ω jack, and the black probe into the COM jack.

• Enter the function item, displayed as shown below:

• Press [OK] to output the relay drive signal which is the same with the battery voltage. We can hear the relay on/off sound. When contacting the contact pin of automotive relay using the red and black probe, we can observe the resistance for the contact on/off and observe the conditions of relay.

• Vehicles using 12V battery can test 12V car relay and 24V battery can test 24V car relay. Please do not use it to test relays with different operating voltages. Especially, do not use a 12V battery to test relays below 6V or a 24V battery to test 12V breakers; Normally, the vehicle with a 12V battery will use a 12V relay and the vehicle with a 24V battery will use a 24V relay.

Analog signal test

• The instrument analog outputs basic square wave and sine wave signals. If other signal simulation is required, contact the manufacturer to customize non-standard products.
• The independent output signal of the instrument is a square wave close to 5V and a sine wave close to 5Vpp. If 12V square wave needs to be generated, the battery needs to be connect-ed for power supply.
• Insert the multi-function detection line into the multi-function interface (the top of the machine). If the 12V square wave signal is required, then connect the battery clip line and connect to the battery;

• Output signal:

  • The “square wave” is identified as the signal line to output the 12V square wave signal.
  • The “K-line” is identified as the signal line to output the 5V square wave signal.
  • The “sine wave” is identified as the signal line to output the sine wave signal.
  • The “5V signal” is identified as the signal line to output 0V~4.5V peak-valley sine wave signal.
  • The “ground line” is identified as the grounding line, which is connected to the application system.

• Output signal frequency:

  • 1Hz~10KHz
  • Duty cycle: 10%~90%

• Enter the function item, displayed as shown below:

• When you first enter the functional interface, there is no analog signal output. Press [OK] to output the signal.

• Press [up / down / left / right] keys to adjust the analog frequency and press [F1 / F2] to adjust the duty cycle of square signal.

• Press [OK] to output/stop the output signal .

• Press [Fn] key to enter the synchronous oscilloscope for observation, insert the red probe to V jack. Contact the signal output line to observe the analog signal waveform.

• When the analog signal is above 6000Hz, the oscilloscope mode is prohibited.

Ignition pulse signal test

• Insert the Ignition pulse signal detection line into the multifunc-tional interface (top of the machine).
• Close to the sensor head (top yellow area) to the ignition of the engine cylinder.

• Enter the function item, displayed as shown below:

• Press [up / down] keys to adjust the waveform amplitude.

• Press [left / right] keys to adjust the time value.

• Press [F1] to select the engine cylinder type and ignition, which is used to calculate the engine speed. The option “distributor” represents the high-voltage signal on the distributor of the old engine, the option “2-stroke” represents the cylinder ignition pulse signal of the two-stroke engine, and the option “4-stroke” represents the ignition pulse signal of the four stroke engine;

• The speed value shown is the engine speed value calculated from the single cylinder ignition pulse signal. During the test, the sensor head shall be close to an ignition wire or an ignition coil of a cylinder, and not close to two or more ignition pulse signal wires. If multiple ignition wires are arranged together, the position close to the spark plug can be selected for detection.

K line data

• Insert the multi-function detection line into the multi-function interface (the top of the machine). The “K line” identification line connects the extension wire and probe; the “ground wire” identification line connects the extension wire and probe; the ground wire probe is connected to the ground wire end of the vehicle circuit (such as the 5 pin of the standard OBD-II), and the K line probe is connected to the K line bus in the vehicle circuit. Note to distinguish K lines on the automotive circuit. For example, the 7-pin of the standard OBD-II is K line, and there are multiple K lines in the car for connecting various low-speed electrical appliances in the car.

• The instrument provides the detection capability of the 5V signal lines and the 12V signal lines. When connected to the 5V signal line, the signal on the K line is 5V signal, and when connected to the 12V signal line, the K line is 12V signal.

• The instrument can test K line Baud rate 1200 / 2400 / 4800 / 9600 / 10400 / 19200 / 38400 / 57600 / 115200. If there is no Baud rate that the user needs, please contact the manufactur-er to customize the non-standard products.

• Enter the function item, displayed as shown below:

• Press [F1] to clear the current display data.

• Press [HOLD] to keep the current display state. In the hold state, press the [up / down] keys to scroll back and forth to view the received data.

• Press the [left / right] keys in the receiving state to change the baud rate of communication.

CAN bus data

• Insert the multi-function detection line into the multi-function interface (the top of the machine). The “CAN+” identification line connects the extension wire and probe; the “CAN -” identi-fication line connects the extension wire and probe; the “ground wire” identification line connects the extension wire and probe; the ground wire probe is connected to the ground wire end of the vehicle circuit (such as the 5 pin of the standard OBD-II); the CAN+ wire probe is connected to the bus CANH in the vehicle circuit; the CAN wire probe is connected to the bus CANL in the vehicle circuit. Note to distinguish the CAN lines on the car circuit. For example, 6 pin of the standard OBD-II is CANH line and 14 pin is CANL line. The car interior also has a multiple CAN bus to connect the various electronic controllers inside the car.

• The instrument can test CAN bus Baud rate 500K / 250K / 125K / 100K / 83.33K / 50K / 33.33K. If there is no baud rate that the user needs, please contact the manufacturer to customize the non-standard products.

• Enter the function item, displayed as shown below:

• Press [F1] to clear the current display data.

• Press [HOLD] to keep the current display state. In the hold state, press the [up / down] keys to scroll back and forth to view the received data.

• Press the [left / right] keys in the receiving state to change the baud rate of communication.

Frequency measurement

• Insert the red probe into the “V” jack and the black probe into the “COM” jack;
• The red probe is connected to the signal to be tested, and the black probe is connected to the ground line of the signal source to be tested.

• The measured signal voltage amplitude is the maximum voltage value of 1000V.

• The measured signal frequency is 1Hz~1MHz.

• Enter the function item, displayed as shown below:

• It displays the frequency of currently detected. Due to the large input impedance of the instrument, the induced interference signal will be displayed when it is not connected to the signal to be measured. It should be connected to the effective signal source during the measurement and the signal source voltage Vpp should be larger than 1V.

OTHER PROBLEMS

Software upgrading

• The instrument can update the application software with MicroSD card and copy the updated file to SD card. Insert the instrument SD holder and restart up. If the instrument detects an available upgrade file, it will be displayed on the screen and press [OK] directly. If you only need to update the data file, the instrument will automatically read in the corresponding file after power on.
• The update file is published by the manufacturer of the instru-ment and is accessible to the user through the distributor.

Equipment identification number
The instrument has a unique identification number that cannot be changed by the user. The manufacturer confirms whether the instrument is legal according to the unique identification number, and the manufacturer may provide after- sales service according to the instrument identification number.

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