ALIENTEK DM40C デジタルマルチメーター、オシロスコープ、信号発生器 ユーザーマニュアル

1. はじめに

Thank you for choosing the ALIENTEK DM40C. This device is a professional 4.5-digit digital multimeter, oscilloscope, and signal generator integrated into a single handheld unit. It offers high precision measurements, a 50M sample rate oscilloscope, and various waveform generation capabilities, making it suitable for a wide range of electrical testing and diagnostic applications.

This manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your DM40C device. Please read it thoroughly before use.

2. 安全情報

Always observe safety precautions when using electrical testing equipment to prevent personal injury or damage to the device.

• 一般的な安全性： Ensure the device is in good working condition before use. Do not operate if damaged.
• 巻tage測定： For DC-DC or high voltage measurements above 36V, it is recommended to use the オート+ mode. This mode skips the millivolt (mV) range to prevent mismeasurement, sparking, and potential damage. The default AUTO mode includes the mV range, which may not be suitable for higher voltages。
• MCX Connector Usage: The MCX pin sizes for the alligator clip and oscilloscope probe differ. The alligator clip's inner pin is larger. Do not attach the alligator clip to the CHA/CHB (oscilloscope analog channels). The alligator clip is intended only for the OUT channel (waveform output) to avoid poor contact or damage to the oscilloscope's analog channels.
• 電流測定： Ensure the circuit is de-energized before connecting the device for current measurements.
• ヒューズ： The unit is fused. If a fuse blows, replace it with one of the specified type and rating.
• テストリード： Use only the provided or equivalent high-quality test leads. The included leads are fine-tipped, suitable for small electronics. For higher-current or heavier work, consider investing in more robust leads.

3.製品オーバーview

The ALIENTEK DM40C combines three essential tools into one compact device: a digital multimeter, an oscilloscope, and a signal generator. It features a high-resolution IPS touchscreen for clear data display and intuitive control.

図3.1: The ALIENTEK DM40C unit shown with its standard accessories, including test leads, probe leads, and a USB-C cable.

図3.2: This image illustrates the core capabilities of the DM40C: a high-precision multimeter, a 10-bit ADC oscilloscope with 50M sampling rate, and a signal generator.

主な特徴:

• マルチメーター: 4.5-digit (59999 count) with high precision and 5ppm reference source.
• オシロスコープ： 10-bit ADC, 50MHz sampling rate, 10MHz bandwidth, 64kpts memory.
• 信号発生器: Generates various waveforms (Sine, Sawtooth, Triangular, Square).
• 画面： 3.5-inch IPS touchscreen (480x320 resolution).
• 力： Rechargeable battery providing over 10 hours of operation.

図3.3: The device features a 3.5-inch IPS touchscreen (480x320 resolution) for clear display and intuitive interaction.

4. セットアップ

4.1. バッテリーの充電

The DM40C is powered by an internal rechargeable battery. Before first use, fully charge the device using the provided USB-C cable and a compatible USB power adapter (not included). The charging indicator on the device will show the charging status.

4.2. テストリードの接続

Connect the test leads to the appropriate input jacks on the right side of the device. The common (COM) jack is typically used for the black lead. The VΩHz°C jack is for voltage, resistance, frequency, and temperature measurements. The A mA uA jack is for current measurements. Ensure connections are secure.

4.3. 初回電源投入

Press and hold the power button to turn on the device. The IPS touchscreen will illuminate, displaying the main interface. Follow any on-screen prompts for initial setup or calibration if presented.

5. 操作手順

5.1. 一般的な操作

• 電源オン/オフ: 電源ボタンを長押しします。
• メニューナビゲーション： Use the touchscreen to navigate through menus and select functions.
• データ保持： ディスプレイ上の現在の読み取り値を固定します。
• Relative Measurement (RLE): Measure the difference between a stored reference value and the current reading.
• データロギング: Record measurement data over time.
• トレンドグラフ: Visualize measurement data trends graphically.

5.2. マルチメーターモード

The DM40C offers a comprehensive range of multimeter functions. Select the desired measurement mode from the main interface.

図5.1: The automatic measurement feature simplifies operation by automatically selecting the correct range for voltage (0.01mV-1000V DC, 0.01mV-750V AC) and current (0.01uA-10A) without manual mode switching.

• 自動測定: The device can automatically detect and select the appropriate range for voltage (DC: 0.01mV-1000V, AC: 0.01mV-750V) and current (0.01uA-10A).
• 巻tage 測定（AC/DC）： Connect leads to COM and VΩHz°C. Select AC or DC voltage mode. Remember to use オート+ 大音量用tage measurements (refer to Safety Information).
• 電流測定（AC/DC）： Connect leads to COM and A mA uA. Ensure the circuit is open and the device is connected in series. The innovative 3-hole design allows fully automatic current measurement across μA/mA/A ranges.
• 抵抗測定： Connect leads to COM and VΩHz°C.
• 静電容量測定: Connect leads to COM and VΩHz°C.
• ダイオードテスト： Connect leads to COM and VΩHz°C. The device provides a 4-stagボリュームtage drop measurement with distinct audible indicators.


図5.2: This screen capture details the diode measurement function with multiple voltage drop indications and the fast continuity test feature, including resistor measurement capabilities.

• 導通テスト: Connect leads to COM and VΩHz°C. An ultra-fast test with an audible indicator.
• 周波数測定： Connect leads to COM and VΩHz°C.
• 温度測定： Requires a compatible temperature probe (not included). Connect the probe to the VΩHz°C and COM jacks.
• AC+DC Mixed Measurement: The DM40C supports simultaneous display of both AC and DC components for complex signals.


図5.3: The display demonstrates the device's ability to perform True RMS measurements, simultaneously display AC and DC components, and visualize data trends over time with adjustable time bases.

5.3. オシロスコープモード

The integrated oscilloscope provides waveform visualization and analysis. Connect the oscilloscope probe to the CHA/CHB input.

• 基本設定: Select oscilloscope mode from the main menu. Adjust vertical scale (V/div) and horizontal time base (s/div) as needed.
• トリガー： Set trigger level and type (edge, pulse, etc.) to stabilize waveforms.
• 寸法: The oscilloscope can display various waveform parameters such as peak-to-peak voltage, frequency, and duty cycle.

5.4. 信号発生器モード

The DM40C can generate various test signals. Connect the output to the OUT channel using the alligator clip (refer to Safety Information regarding MCX connector usage).

• 波形の選択: Choose from Sine wave, Sawtooth wave, Triangular wave, or Square wave.
• 周波数調整： Set the desired output frequency (1Hz to 50KHz for most waveforms, up to 10MHz for square wave).
• Amp光度調整: Adjust the peak-to-peak voltage (0.5Vpp to 3.0Vpp).
• デューティサイクル: Adjustable for Square wave (0-100%).

6. メンテナンス

6.1. 清掃

定期的に柔らかくて乾いた布でデバイスを清掃してください。amp 布で拭いてください。研磨剤入りの洗剤や溶剤は使用しないでください。清掃する前に、必ずデバイスの電源を切り、すべての電源から取り外してください。

6.2. バッテリーのお手入れ

バッテリーの寿命を延ばすため、バッテリーを頻繁に完全に放電することは避けてください。デバイスを長期間保管する場合は、約50%まで充電し、涼しく乾燥した場所に保管してください。

図6.1: The DM40C incorporates safety isolation for multimeter communication and is powered by a rechargeable battery providing over 10 hours of operation.

6.3. ファームウェアのアップデート

ALIENTEK may release firmware updates to add features or fix bugs. Check the official ALIENTEK website for the latest firmware and instructions on how to update your device. Exercise caution when installing third-party applications or firmware not directly from the manufacturer.

7。 トラブルシューティング

• デバイスの電源が入らない: バッテリーが充電されていることを確認してください。USB-Cケーブルを接続し、充電しながら電源を入れてみてください。
• 不正確な読み取り: テストリードの接続を確認してください。正しい測定モードが選択されていることを確認してください。電池残量を確認してください。
• オシロスコープの波形がありません: Check probe connection to CHA/CHB. Adjust vertical scale and time base. Verify trigger settings.
• Sparking during voltage測定： Immediately switch to オート+ mode for high voltage measurements (above 36V) to prevent this. Refer to Safety Information.
• Damage to oscilloscope input: Ensure alligator clips are ない connected to CHA/CHB. Alligator clips are for the OUT channel only. Refer to Safety Information.
• Bluetooth 接続の問題: Ensure your device has the latest firmware (version 2.2 or higher for Bluetooth functionality, if available for your model). Note that Bluetooth may only support multimeter functions.

8. 仕様

The following table outlines the key specifications for the ALIENTEK DM40C.

図8.1: A comprehensive table outlining the technical specifications, measurement ranges, and accuracy for the DM40A, DM40B, and DM40C models across various functions including voltage、電流、抵抗、静電容量、周波数、温度。

9. 保証とサポート

ALIENTEK products are designed for reliability and performance. For warranty information, please refer to the documentation included with your purchase or visit the official ALIENTEK website. For technical support, troubleshooting assistance, or inquiries about replacement parts, please contact ALIENTEK customer service through their official channels.