DM40 Multimeter User Manual

Revision History

Safety Instructions (Must Read)

1. Before using DM40, please check carefully if the shell has cracks or defects, and ensure the measurement ports and accessories are normal.
2. 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.
3. Please select the correct measurement port, range, and scale to avoid damaging the instrument or causing personal injury!
4. Hold the probe at the protected position. Do not hold the metal part for measurement!
5. Do not disassemble the case at will or measure while the case is open.
6. Do not use in environments with flammable or explosive gases/materials or in damp conditions.
7. 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.
8. To use the Bluetooth function, please go to Settings > Other Settings, turn on the Bluetooth, and then connect via the APP(ATK-XTOOL).

1. 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 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, 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.
• Signal generator supports sine wave, sawtooth wave, triangle wave, and square wave up to 10MHz.

DM40 Basic Parameters

DM40 Multimeter Technical Parameters

2. Quick Start

2.1 Appearance Description

The DM40 multimeter features a user-friendly design with various buttons and ports. The front panel includes a power button, a 3.5-inch IPS touchscreen, and multi-function touch buttons. The top of the device displays key information like AUTO+, RUN status, uptime, and Bluetooth status.

Description of DM40 Unit Components:

• ① Power Button: Long press to turn on/off, double-click to lock/unlock touch functionality.
• ② TypeC Port: Used for charging and USB communication (input voltage <5.2V).
• ③ Charging Indicator: Blue light indicates charging; off when fully charged.
• ④ MCX Signal Generator Port: For connecting the signal generator.
• ⑤ MCX Oscilloscope Port: For connecting the oscilloscope.
• ⑥ 3.5" (480*320) IPS Touchscreen: Provides a high-resolution display for interaction.
• ⑦ Measurement Ports (Red Terminal): Used for Voltage, Resistance, Capacitance, Continuity, Diode, Frequency, Temperature measurements. The black COM port is common for these.
• ⑧ Current Measurement Port (Red Terminal): Dedicated port for current measurement (MAX 10A). It includes a built-in 10A ceramic fuse. The black COM port is common.
• ⑨ Multi-function Touch Buttons: MENU, RUN, AUTO, MF for navigating and controlling functions.

2.2 Multimeter Measurement Interface

The multimeter interface is designed for clarity and ease of use, featuring a top status bar, left-side multi-function touch buttons, a central display area for measurement readings, and bottom touch buttons to switch between measurement functions.

Status Bar Description:

• Range Indication: Displays AUTO or manual range (for voltage, current, resistance).
• Running Status: RUN for active measurement, HOLD for data hold.
• Uptime: Shows operational time in hours/minutes/seconds.
• Touch Lock/Unlock: Double-click the power button to lock/unlock the touchscreen.
• BT Status: Indicates Bluetooth connection status (icon appears when connected).
• Battery Info: Displays battery level or charging progress.

Left Touch Buttons:

• MENU: Returns to the function or measurement interface.
• RUN: Toggles between RUN and HOLD modes.
• AUTO: Restores automatic range and turns off RLE function.
• MF: Accesses measurement settings (for V/A/Ω).

Value of Measurement:

• Aux1: Displays frequency (AC mode), AC component (AC+DC mode), or machine temperature (temperature mode).
• Aux2: Displays duty cycle (AC/frequency mode), DC component (AC+DC mode), equivalent resistance (diode mode), or Fahrenheit (temperature mode).
• Main display: Shows the primary measurement value and unit.
• RLE function: Records a base value for relative measurements.
• MAX/MIN: Records maximum and minimum measured values.
• Waveform Display: Shows waveform data with auto-scaling and adjustable time bases.

2.2.4 Mode Setting Buttons

Buttons allow cycling through measurement modes:

• Voltage Measurement: Cycles through DCV, ACV, AC+DC (DM40B/C).
• Current Measurement: Cycles through DCA, ACA, AC+DC (DM40B/C).
• Resistance Measurement: Cycles through offline and online measurement (online indicated by Ω with subscript ON).
• Capacitance Measurement: Sets to capacitance mode (supports auto range).
• Diode/Continuity Measurement: Cycles through diode and continuity modes.
• Frequency/Temperature Measurement: Cycles through frequency and temperature modes.

Note: Switching modes resets AUTO/AUTO+ range and turns off RLE.

2.2.5 Data Recording

The DM40 supports screen data recording. Short-press the main display number area to record data. Up to 5 sets of data can be stored, with older data being overwritten. Long-press the main display area to clear all records.

2.3 Measurement Mode Description

2.4 Measurement Port Description

The DM40 features clearly labeled ports for various measurements:

• VΩHz+°C (Red Terminal): Used for AC/DC voltage, resistance, continuity, diode, capacitance, frequency, and temperature measurements.
• COM (Black Terminal): The common ground port for all measurements.
• A mA uA (Red Terminal): Dedicated port for current measurements, supporting up to 10A (Max). This port has a built-in 10A ceramic fuse.

2.5 Measurement Methods

2.5.1 Voltage Measurement

1. Press the voltage button [V] to enter voltage measurement mode (defaults to DC). Cycle through DCV/ACV/AC+DC modes by pressing the button (AC+DC available on DM40B/C).
2. Connect the black probe to the COM port and the red probe to the VΩHz port.
3. Connect the probes to the circuit under test and observe the reading 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.

2.5.2 Current Measurement

1. Press the current button [A] to enter current measurement mode (defaults to DC). Cycle through DCA/ACA/AC+DC modes by pressing the button (AC+DC available on DM40B/C).
2. Connect the black probe to the COM port and the red probe to the A mA uA port.
3. Connect the probes to the circuit under test and observe the reading 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.

2.5.3 Resistance Measurement

1. Press the resistance button [Ω] to enter resistance measurement mode.
2. Connect the black probe to the COM port and the red probe to the VΩHz port.
3. Connect the probes to the resistor under test and observe the reading on the screen. 'OL' indicates out of range.

Note: Online measurement is recommended for measuring resistors in-circuit.

2.5.4 Capacitance Measurement

1. Press the capacitance button [+] to enter capacitance measurement mode (supports auto range only).
2. Connect the black probe to the COM port and the red probe to the VΩHz port.
3. Discharge the capacitor before connecting the probes. Observe the reading on the screen. 'OL' indicates out of range. Testing large mF capacitors may take longer.

Note: Do not perform voltage measurement in this mode to avoid damaging the instrument.

2.5.5 Diode/Continuity Measurement

1. Press the diode/buzzer button [))) ] to enter diode measurement mode. Press again to switch to continuity measurement.
2. Connect the black probe to the COM port and the red probe to the VΩHz port.
3. Connect the probes to the component. Diode measurement provides 4-segment beeps for different voltage drops. 'OL' is displayed if the voltage drop is exceeded. Supports resistance measurement up to 1KΩ. The buzzer beeps continuously around 30 Ω.

Note: Do not perform voltage measurement in this mode to avoid damaging the instrument.

2.5.6 Frequency/Temperature Measurement

1. Press the frequency/temperature button [Hz°C] to enter frequency measurement mode. Press again to switch to temperature measurement mode.
2. For frequency measurement, the recommended input signal amplitude is within 20Vrms (limit 250Vrms). Connect probes to the signal under test. 'OL' indicates out of range. Aux2 shows signal duty cycle.
3. For temperature measurement, connect the thermocouple to the COM port (negative) and VΩHz port (positive). Contact the probe with the object's surface. 'OL' indicates out of range. Aux1 shows machine temperature; Aux2 shows thermocouple reading in Fahrenheit.

Note: Do not perform voltage measurement in temperature mode to avoid damaging the instrument.

2.6 Measurement Settings

2.6.1 Voltage and Current Measurement Settings

To adjust voltage or current measurement settings, press the respective measurement button, then press the MF button to access the settings interface.

Explanation: The DM40C offers 5 manual ranges and 2 automatic ranges (AUTO and AUTO+). AUTO automatically switches between mV and V ranges, while AUTO+ switches only within V ranges, offering faster measurements for high-voltage or DC measurements. Measurement modes include AC, DC, and AC+DC (DM40B/C).

2.6.2 Resistance Measurement Settings

To adjust resistance measurement settings, press the resistance button [Ω], then press the MF button to access the settings interface.

Explanation: The DM40C provides 6 manual resistance ranges and one automatic range (AUTO). Resistance measurement can be performed offline (resistor removed) or online (on the circuit board). Offline mode offers higher voltage, speed, and accuracy, while online mode has lower voltage and moderate speed with potential small deviations. Online mode is indicated by Ω with subscript ON.

3. Oscilloscope & Signal Generator Usage Instructions

For detailed instructions on using the Oscilloscope and Signal Generator functions, please refer to the dedicated document: DM40 Oscilloscope & Signal Generator Manual.pdf.

4. Other Functions

4.1 System Settings

Access system settings by navigating to Settings on the main interface.

4.2 Firmware Update Instructions

To update firmware, go to System settings > Other Settings, select USB connection, and connect the DM40 to a computer via USB cable. Copy the firmware file (e.g., dm40xxx.bin) to the U-disk that appears on the computer. Eject the U-disk, then long-press the power button to restart and initiate the automatic firmware update.

4.3 Custom Boot Logo

Create a boot logo with 480*320 resolution in JPG or BMP format, named 'logo.jpg' or 'logo.bmp'. Connect the device to a computer, open the U-disk, replace the existing logo file, and restart to apply the custom logo. To remove it, delete the file.

4.4 Quick screenshot instructions

Swipe down with three fingers to take a screenshot. The interface has an anti-aliasing effect and saves the image for 4-5 seconds. A confirmation message will appear upon successful capture. Saved images can be accessed via USB connection.

4.5 Anti-drop Mode Instructions

Certain measurements (mV voltage, resistance, diode, continuity) use magnetic latching relays. While these offer low power consumption, they can be susceptible to errors from shaking. Enabling 'Anti-drop Mode' keeps relays engaged, preventing false measurements from minor impacts. This mode increases power consumption, reducing battery life by about 1 hour. For stationary use, disabling this mode can extend endurance to approximately 12 hours.

4.6 Slide to Shutdown and Auto-shutdown Instructions

Slide two fingers down to initiate a slide-to-shutdown prompt. Slide right to confirm shutdown. If no touch operations are performed within the set auto-shutdown time, a 10-second countdown with a buzzer will begin, followed by automatic shutdown.

4.7 Mode Memory Functions

In System settings > Others, enabling 'Mode Memory' allows the multimeter to remember the last measurement mode and automatically switch to it upon restart. This feature can be enabled or disabled based on user preference.

4.8 Bluetooth Function

1. Install the ATK-XTOOL app (Android only; iOS version developing).
2. On the DM40, go to Settings > Other Settings, turn on Bluetooth, and follow any prompts.
3. Enable Bluetooth on your phone and open the ATK-XTOOL app. Connect to a device starting with 'DM40'. The app supports up to 4 devices.
4. The app interface buttons mirror the DM40's touch buttons. A circled Bluetooth icon in the status bar allows quick connection/disconnection.
5. The Bluetooth name can be partially modified (up to 10 characters), with the first 5 characters fixed to the device model.

5. Services

After-sales Service

ALIENTEK warrants the product against defects in materials and workmanship for 1 year from the original purchase date. This warranty is non-transferable. ALIENTEK will repair or replace defective products. The warranty does not cover damage caused by improper use or maintenance.

Website

• Download: www.alientek.com/download
• Company: www.alientek.com
• Aliexpress: www.aliexpress.com/store/1102909571

Contact Us

Email: fae-smt@alientek.com