ALIENTEK DM40 3-in-1 Touchable Multimeter
Product Usage Instructions
- Before using the DM40, check for cracks or defects on the shell and ensure all ports and accessories are normal.
- Avoid measuring while charging to maintain measurement stability.
- Select the correct measurement port, range, and scale to prevent damage or injury.
- Hold the probe at the protected position during measurement.
- Avoid disassembling the case or measuring with an open case.
- Avoid usage in flammable/explosive environments or damp conditions.
- For DC or high voltage measurements above 36V, use AUTO+ mode to skip the mV range and start from V range.
- The DM40 digital multimeter is a high-performance 3-in-1 multimeter by Guangzhou Xingyi Electronic Technology Co., Ltd.
- It offers various features such as a rechargeable battery, firmware upgrade capabilities, custom boot logo options, data recording, shockproof mode, slide to shutdown function, and mode memory.
- Describe the physical appearance of the multimeter, highlighting buttons, display screen, and ports.
- Explain how to select measurement modes, ranges, and interpret readings on the interface.
- Provide guidance on utilizing the oscilloscope and signal generator functionalities of the multimeter.
- Detail additional functions like resistor mode settings, countdown shutdown, and quick mode switch of the resistor.
- Information on customer services provided for the product.
Revision History
| Version | Date | Modify Contents |
| V1.0 | 2024/12/07 | First release |
| V1.1 | 2024/12/11 | Added firmware upgrade, custom boot logo, and quick screenshot instructions |
| V1.2 | 2024/12/13 | Added multimeter measurement settings instructions, added AUTO+ mode |
| V1.3 | 2024/12/25 | Added data record, resistor mode settings, shockproof mode, slide to shutdown |
| V1.4 | 2025/01/18 | Added mode memory, quick mode switch of the resistor, and countdown shutdown |
Thank you for purchasing this product. To fully understand its features and operation, we recommend reading this manual carefully before use.
Safety Instructions
Safety Instructions (Must Read)
- Before using DM40, please check carefully if the shell has cracks or defects, and ensure the measurement ports and accessories are normal.
- DM40 integrates a rechargeable battery. For safety and measurement stability, please do not measure while charging. Low battery reminders may affect accuracy. Please charge promptly.
- Please select the correct measurement port, range, and scale to avoid damaging the instrument or causing personal injury！
- Hold the probe at the protected position. Do not hold the metal part for measurement！
- Do not disassemble the case at will or measure while the case is open.
- Do not use in environments with flammable or explosive gases/materials or in damp conditions.
- For voltage measurement, when used for DCDC or high voltage above 36V measurement, it is recommended to use AUTO+ mode to skip the mV range (to avoid mismeasurement, sparking, and protection) and start measurement from the V range.
Product Introduction
The DM40 digital multimeter is the first high-performance 3-in-1 multimeter launched by Guangzhou Xingyi Electronic Technology Co., Ltd. Its main features are as follows:
- Integrated multimeter, oscilloscope, and signal generator, featuring comprehensive functions and convenient measurement.
- Equipped with a 3.5-inch 480*320 IPS capacitive touchscreen, providing a delicate display and convenient interaction.
- 4-5/6 multimeter with a count of up to 60000 (C version), TRMS true RMS measurement, precise and reliable.
- Automatic mV/V range and innovative uA/mA/A range design for quick and efficient measurement.
- AC+DC mixed measurement (B/C versions), no signal escapes detection.
- Super diode measurement with multi-segment beep design, quick response, and support for resistance (<1KΩ) measurement.
- Supports resistance, capacitance, continuity, frequency, temperature, and other measurements.
- Supports manual (V/A/Ω)/automatic range, RLE relative measurement, extreme value measurement, and data hold.
- Supports trend chart display for efficient data analysis with 3 adjustable time bases.
- Oscilloscope with 50MSa/s sampling rate, 10MHz bandwidth, and 10-bit vertical resolution.
- Oscilloscope supports multiple trigger modes and types, as well as FFT and ABS operations.
- The signal generator supports sine wave, sawtooth wave, triangle wave, and square wave up to 10MHz.
Basic Parameters
DM40 Basic Parameters
| Basic Information | |
| Model | DM40A、DM40B、DM40C |
| Screen | 3.5′(480*320) IPS Touchscreen |
| Battery Life | ≈12H(Multimeter)
≈10H(Oscilloscope) |
| Dimensions | 140 * 83 * 25mm |
| Weight | ≈260g |
| Interface | USB Type-C/MCX Socket/Banana Jack Socket |
| Conditions | Temperature 0~40℃、Humidity <75% |
Table 1.0 DM40 Basic information
DM40 Multimeter Technical Parameters:
| Multimeter Technical Parameters | |||||
| Model | DM40A | DM40B | DM40C | ||
| Function | Range | Accuracy | |||
| DC Voltage | 400mV/4V/40V
/400V/1000V |
500mV/5V/50V
/500V/1000V |
600mV/6V/60V
/600V/1000V |
±(0.03%+5d) | |
| AC Voltage | 400mV/4V/40V
/400V/750V |
500mV/5V/50V
/500V/750V |
600mV/6V/60V
/600V/750V |
±(0.3%+15d) | |
|
DC Current |
400uA/4000uA
/40mA/400mA |
500uA/5000uA
/50mA/500mA |
600uA/6000uA
/60mA/600mA |
±(0.15%+5d) | |
| 4A/10A | 5A/10A | 6A/10A | ±(0.2%+5d) | ||
|
AC Current |
400uA/4000uA
/40mA/400mA |
500uA/5000uA
/50mA/500mA |
600uA/6000uA
/60mA/600mA |
±(0.5%+15d) | |
| 4A/10A | 5A/10A | 6A/10A | ±(0.75%+15d) | ||
|
Resistor |
400Ω/4KΩ/40KΩ
/400KΩ/4MΩ |
500Ω/5KΩ/50KΩ
/500KΩ/5MΩ |
600Ω/6KΩ/60K Ω/600KΩ/6MΩ | ±(0.1%+5d) | |
| 40MΩ | 50MΩ | 60MΩ | ±(0.2%+10d) | ||
|
Capacitance |
4nF/40nF/400nF
/4uF/40uF |
5nF/50nF/500nF
/5uF/50uF |
6nF/60nF/600nF
/6uF/60uF |
±(2.5%+30d) | |
| 400uF/4mF/40mF | 500uF/5mF/50mF | 600uF/6mF/60mF | ±(3.5%+30d) | ||
| Frequency | 10Hz~40MHz | 10Hz~50MHz | 10Hz~60MHz | ±(0.01%+5d) | |
| Temperature | -40℃~1000℃(Standard probe range -20℃~300℃)
-40℉~1832℉ |
±(1.0%+5℃)
±(1.5%+5℉) |
|||
| Continuity | 0Ω~1KΩ | ±(0.2%+5d) | |||
| Diode | 0V~3.0V, 0Ω~1KΩ | ±(1%+5d) | |||
| AC Response | 10KHz | ||||
DM40 Oscilloscope Technical Parameters
| Oscilloscope Technical Parameters | |||
| Sample Rate | 50MSa/S | Input impedance | 1MΩ |
| Bandwidth | 10Mhz | Timebase Mode | YT/ROLL |
| Memory Depth | 64Kpts | Sweep Mode | Auto/Normal/Single |
| Time Scale | 100ns~50s | Trigger Type | Rising/Falling |
| Vertical Scale | 10mV~10V
/div(X1) |
Persistence | OFF /Min/1S/∞ |
| Resolution | 10bit | Math | FFT/ABS |
| Coupling | AC、DC | Measurement items | 20 types |
Table 1.2 Oscilloscope Technical Parameters
DM40 Signal Generator Technical Parameters
| Signal Generator Technical Parameters | |||||
| Wave out | Sine Wave | Sawtooth Wave | Triangle Wave | Square Wave | |
| Frequency | 1Hz~50KHz | 100KHz~10MHz | |||
| Amplitude | 0.5V~3.0Vpp | 3.0Vpp | |||
| Duty | Not Adjustable | 0~100% | Not Adjustable | ||
Table 1.3 Signal Generator Technical Parameters
DM40 Adjustable MCX Probe Parameters
| Adjustable MCX Probe Parameters | ||||
| Attenuation
Ratio |
Bandwidth | Input Impedance | Input
Capacitance |
Maximum
Voltage |
| X1 | 20MHz | 1MΩ±2% | 50pF±20pF | 40VRMS CATⅡ |
| X10 | 140MHz | 10MΩ±2% | 15pF±5pF | 400VRMS CATⅡ |
Table 1.4 Adjustable MCX Probe Parameters
Quick Start
Appearance Description
Description
- Power Button (Long press to turn on/off, double-click to lock/unlock touch)
- Type-C Port (For charging and USB communication, input voltage <5.2V)
- Charging Indicator (Blue light when charging, off when fully charged)
- MCX Signal Generator Port
- MCX Oscilloscope Port
- 3.5″ (480*320) IPS Touchscreen
- Voltage, Resistance, Capacitance, Continuity, Diode, Frequency, Temperature Measurement Ports (Black COM is common)
- Current Measurement Port (Black COM is common)
- Multi-function Touch Buttons (MENU, RUN, AUTO, MF)
Multimeter Measurement Interface
The multimeter interface displays rich content: top status bar; left 4 multi-function touch buttons; middle for various measurement displays; bottom 6 touch buttons to switch 8 measurement functions, as shown in Figure 2.2.1.
Status Bar Description
- Range Indication: AUTO range and manual range (only for voltage, current, and resistance).
- Running Status: RUN for running status, HOLD for data hold.
- Touch Lock/Unlock: Double-click the power button to lock/unlock touch function. After locking, touch is invalid. Single-click the power button can still switch measurement modes within the current mode.
- Uptime: Records uptime (in hours/minutes/seconds).
- Battery Info: Displays battery level when not charging, charging progress when charging (Do not measure while charging to avoid mismeasurement).
Left Touch Buttons
- MENU: Click to return to the function interface or measurement interface.
- RUN: Click to toggle RUN/HOLD mode. HOLD stops the interface from refreshing (except for Uptime).
- AUTO: Click to restore automatic range and turn off RLE function.
- MF: Enter/exit measurement settings (only for V/A/Ω). For voltage/current, select the range first and then the AC/DC measurement. For resistance, select the range and return to the measurement interface.
Value of measurement
- Aux1: AC mode displays frequency, AC+DC mode displays AC component, and temperature mode displays machine temperature.
- Aux2: AC mode and frequency mode display duty, AC+DC mode displays DC component, diode mode displays equivalent resistance, temperature mode displays Fahrenheit.
- Main display: Displays measurement value and units.
- RLE function: In non-OL and data hold states, click the RLE button to enable the RLE function and enter the manual range. Records the main display value to RLE. The main display subtracts the RLE value. Click once to update. Click the AUTO button/switch to measure mode/long-press the RLE button to turn off this function and restore automatic range.
- MAX/MIN: Records the maximum and minimum measured values. Clears after changing
measurement modes； - Waveform Display: Synchronously displays the main display value. The waveform auto-scales, with horizontal*vertical=20*6 grids. Time base options are 160mS/320mS/640mS. Default is
320mS/div；
Mode Setting Buttons
- Voltage Measurement: Cycle through DCV mode, ACV mode, and AC+DC mode (only DM40B/C). Current Measurement: Cycle through DCA mode, ACA mode, AC+DC mode (only DM40B/C). Resistance Measurement: Click to cycle through offline and online resistance measurement. Online measurement is indicated by Ω with a subscript ON.
- Capacitance Measurement: Set to capacitance measurement mode.
- Diode/Continuity Measurement: Cycle through the diode and continuity measurement.
- Frequency/Temperature Measurement: Cycle through frequency and temperature measurement. Note: Switching measurement modes restores AUTO/AUTO+ range and turns off RLE function.
Data Recording
- DM40 supports screen data recording. In non-OL state, short-press the main display number area to record and update data once. A short beep indicates recording. The most recently updated data is orange, and others are white. Supports up to 5 sets of data. Older data is overwritten. Long-press the main display area for 1s to clear all records. A long beep indicates clearing.
Measurement Mode Description
Table 2.3.1 Measurement Mode Description
Measurement Port Description
Measurement Methods
Voltage Measurement
- Click the voltage button
to enter voltage measurement mode Default is DC measurement. Cycle through DCV/ACV/AC+DC measurement by clicking (only DM40B/C). - Connect the black probe to the black COM port and the red probe to the red V ΩHz port.
- Connect the probes to the circuit under test and observe the measured value on the screen. OL indicates out of range.
Note: Do not exceed the maximum measure value. Use auto range if unsure of the voltage range.
Current Measurement
- Click the current button
to enter current measurement mode. Default is DC measurement. Cycle through DCA/ACA/AC+DC measurement by clicking (only DM40B/C). - Connect the black probe to the black COM port and the red probe to the red A mA uA port.
- Connect the probes to the circuit under test and observe the measured value on the screen. OL indicates out of range.
Note: Do not exceed the maximum measure value ( 10A). Use auto range if unsure of the current range.
Resistance Measurement
- Click the resistance button Ω to enter resistance measurement mode.
- Connect the black probe to the black COM port and the red probe to the red V ΩHz port.
- Connect the probes to the resistor under test and observe the measured value on the screen. OL indicates out of range.
Note: It is recommended to switch to online measure mode for online measurement.
Capacitance Measurement
- Click the capacitance button
to enter capacitance measurement mode. Capacitance measurement only supports automatic range. - Connect the black probe to the black COM port and the red probe to the red V ΩHz port.
- Discharge the capacitor in advance, then connect the probes to the capacitor under test and observe the measured value on the screen. OL indicates out of range. Testing large mF capacitors takes longer, which is normal.
Note: Do not perform voltage measurement in this mode to avoid damaging the instrument.
Diode/Continuity Measurement
- Click the diode/buzzer button
to enter diode measurement mode. Click again to switch to continuity measurement. - Connect the black probe to the black COM port and the red probe to the red V ΩHz port.
- Connect the probes to the component under test. Diode measurement supports 4 segment beeps (<0.02V long beep, <0.45V two short beeps, <0.75V one short beep, <1.5V urgent three short beeps). The maximum voltage dr op displayed is around 3.1V. OL is displayed if exceeded. Also supports resistance measurement within 1K Ω OL, displayed if exceeded. Approximately within 30 Ω, the buzzer beeps continuously 。
Note: Do not perform voltage measurement in this mode to avoid damaging the instrument.
Frequency/Temperature Measurement
- Click the frequency/temperature button
to enter frequency measurement mode. Click again to switch to temperature measurement mode. - For frequency measurement, the recommended input signal amplitude is within 20Vrms, with a limit of 250Vrms. Connect the black probe to the black C OM port and the red probe to the red VΩHz port. Connect the probes to the signal under test and observe the measured value on the screen. OL indicates out of range. Aux 2 shows the signal duty cycle.
- For temperature measurement, connect the thermocouple negative terminal to the black C OM port and the positive terminal to the red VΩHz port. Contact the probe with the surface of the object under test and observe the measured value in Celsius. OL indicates out of range. Aux 1 shows machine temperature. Aux 2 shows the measured value of the thermocouple in Fahrenheit.
Note: Do not perform a voltage measurement in temperature mode to avoid damaging the instrument.
Measurement Settings
Voltage and Current Measurement Settings
Taking DM40C voltage measurement setting as an example:
Click the voltage V measurement button to enter voltage measurement mode, then Click the MF button to enter the settings interface (similar for current measurement settings).
Explanation
- DM40C includes 5 manual ranges (600mV/6V/60V/600V/1000V) and two automatic ranges (AUTO and The difference is that AUTO is a fully automatic range, switching between mV and V ranges automatically, while AUTO+ is a V range automatic range, only switching within V ranges. AUTO+ mode avoids relay flickering and speeds up measurement, suitable for frequent high-voltage or DCDC measurements.
- Voltage measurement modes include AC, DC, and AC+DC (DM40B/C). Select any one to return to the measurement interface. Clicking MF also returns to the measurement interface. After returning to the main interface, the range mode is indicated in the top left corner.
- The side AUTO button implements the AUTO or AUTO+ function according to the settings.
Resistance Measurement Settings
- Taking DM40C resistance measurement setting as an example: Click the resistance Ω measurement button to enter resistance measurement mode, then click the MF button to enter the settings interface.
Explanation
- DM40C resistance measurement ranges include 6 manual ranges (600 Ω /6K Ω /60K Ω /600K Ω /6M Ω /60M Ω ) and one automatic range (AUTO). Select any one or click MF to return to the measurement interface. After returning to the main interface, the range mode is indicated in the top left corner.
- Resistance measurement includes offline and online measurements. Offline mode is measuring the resistor separately after removing it, featuring high measurement voltage, fast speed, and high accuracy. Online mode is directly measured on the circuit board, featuring lower voltage, moderate speed, but small deviation. Select one or click MF to return to the measurement interface.
- Click the resistance measurement button to quickly cycle through offline and online modes.
- Online mode is indicated by Ω with subscript ON
Oscilloscope & Signal Generator Usage Instructions
- Please refer to the document: DM40 Oscilloscope & Signal Generator Manual.pdf
Other Functions
System Settings
- Access system settings by clicking Settings on the main interface.
| Item | Content | Description |
| 1. Language | Simplified、Traditional、English | Currently supports 3 languages |
| 2. Power | Screen Dim Time :5min、10min、30min、Never
Shutdown Time :10min、30min、1h、Never |
Screen dims to minimum brightness
Auto-shutdown at shutdown time |
| 3. Startup page | Multimeter, Oscilloscope,
Signal Generator, Main Interface |
Quickly enter the set startup interface |
| 4. Volume and
Backlight |
Backlight:10%~100%
Volume:0%~100% |
Minimum brightness:10%, 0% turns off the buzzer |
| 5. Other Settings | USB Connection Factory Reset, Shockproof Mode
Mode Remember |
Firmware update and image upload restore default settings
Avoid error measurement DMM measure mode remember |
| 6. Device info | Manufacturer, Website, Model, Serial Number,
Software and Hardware Version |
Table 4.1 System settings
Firmware Update Instructions
System settings
, Others, select USB connection, connect DM40 to a computer via a USB cable. The computer will pop up a U disk . Open the U disk , place the latest firmware (dm40xxx.bin), eject the U disk afte r transfer is complete. Then long long-press the power button to restart and update the firmware automatically.
Custom Boot Logo
Create a boot logo with requirements: 480 320 resolution, 1-bit BMP image, named logo.bmp. Connect the device to a computer, open the U-disk, replace the existing logo.bmp file, and restart to apply. To remove the boot logo, delete the file directly.
Quick screenshot instructions
Swipe down with 3 points and hear a beep~ prompt to start taking screenshots. The multimeter interface has an aliasing effect and saves for a long time (4~5s). After completing the screenshot, it will prompt that the screenshot is successful (the saved image can be copied and viewed by connecting to a computer via USB).
Shockproof Mode Instructions
mV voltage measurement, resistance measurement, diode and continuity measurement, etc., require magnetic latching relays. Advantages of magnetic latching relays include low power consumption. The disadvantages are high cost, lack of drop resistance, and strong shaking that may cause erroneous measurements, especially for diode and on-off measurements.
Enabling shockproof mode keeps the relay engaged continuously, effectively avoiding false measurements caused by ordinary collisions. However, it increases power consumption, reducing endurance by about 1 hour. If the device is used in a fixed position without movement, it is recommended to disable shockproof mode for an average endurance of around 12 hours.
Slide to Shutdown and Auto Shutdown Instructions
- Slide two fingers down to prompt the slide to shut down. Cancel or slide to the right to shut down.
- If no touch operations are performed within the auto shutdown time, a 10 s countdown with buzzer prompt will start. No operation will result in an auto shutdown.
Mode Memory Instructions
- System setting Others enable mode memory function will remember the last measurement mode and automatically switch to it after restarting. Users can choose whether to enable this function based on actual needs.
Services
After-sales Service
- We warrant that the product will be free from defects in materials and workmanship for a period of 1 year from the date of purchase of the product by the original purchaser from our company.
- This warranty only applies to the original purchaser and is not transferable to a third party.
- If the product proves defective during the warranty period, we will either repair the defective product without charge for parts and labour, or provide a replacement in exchange for the defective product.
- This warranty shall not apply to any defect, failure, or damage caused by improper use or improper or inadequate maintenance and care.
Website
- Download: www.alientek.com/download
- Company: www.alientek.com
- Aliexpress: www.aliexpress.com/store/1102909571
Contact US
- Email: fae-smt@alientek.com
FAQ
- Q: Can I measure high voltages with this multimeter?
- A: Yes, you can measure high voltages above 36V using the AUTO+ mode to skip the mV range and start from the V range.
- Q: Is it safe to use the multimeter while charging?
- A: It is recommended not to measure while charging to ensure safety and measurement stability.
Documents / Resources
 |
ALIENTEK DM40 3-in-1 Touchable Multimeter [pdf] User Manual DM40, DM40 3-in-1 Touchable Multimeter, 3-in-1 Touchable Multimeter, Touchable Multimeter, Multimeter |