คู่มือผู้ใช้เครื่องตรวจจับความผิดเพี้ยน SMD รุ่น DD-1

1. บทนำ

The SMD Distortion Detector DD-1 is an essential tool for audio enthusiasts and professional installers. Its primary function is to accurately set the gain of audio amplifiers and other processors to match the source unit's output level. This ensures a clean, undistorted audio signal, maximizing system performance and protecting your equipment from damage caused by clipping.

The DD-1's circuitry is 100% analog, providing reliable and precise distortion detection. It is designed to operate across a wide range of input signals, making it versatile for various audio applications.

Figure 1.1: The SMD Distortion Detector DD-1 with included test leads.

2. ข้อมูลด้านความปลอดภัย

Please read all safety instructions before using the SMD DD-1. Failure to follow these instructions may result in electric shock, fire, or damage to the device or connected equipment.

• อย่าให้เครื่องโดนน้ำหรือความชื้นมากเกินไป
• อย่าเปิดcasing of the DD-1. There are no user-serviceable parts inside.
• Ensure all connections are secure before applying power to audio equipment.
• Use only the provided test leads or compatible replacements.
• Always disconnect power from audio equipment before making or changing connections.
• เก็บให้พ้นจากมือเด็ก

3. เนื้อหาบรรจุภัณฑ์

ตรวจสอบว่ามีสินค้าทั้งหมดที่ระบุไว้ด้านล่างอยู่ในแพ็คเกจของคุณ:

• SMD Distortion Detector DD-1 Unit
• Test Leads (RCA to bare wire)
• คู่มือของเจ้าของ
• DD-1 Test Tone Disc (CD)
• 1 D Battery (pre-installed or included separately)

Figure 3.1: All components included in the SMD DD-1 package.

4. การตั้งค่า

Follow these steps to prepare your DD-1 for operation:

1. การติดตั้งแบตเตอรี่: The DD-1 requires one D battery. The battery compartment is located on the back of the unit. Ensure the battery is inserted with the correct polarity.
   

   รูปที่ 4.1: ด้านหลัง view of the DD-1, indicating the battery compartment.

2. การเชื่อมต่อสายทดสอบ: Connect the provided test leads to the input jack on the top of the DD-1 unit. The RCA connector from the test leads plugs into the DD-1. The bare wire ends of the test leads will connect to the speaker output terminals of your amplifier หรือโปรเซสเซอร์
   

   Figure 4.2: Proper connection of test leads to the DD-1 unit.

3. Prepare Test Tones: Insert the included DD-1 Test Tone Disc into your source unit (e.g., car stereo CD player). This disc contains specific test tones (e.g., 1kHz, 40Hz) required for accurate gain setting.

5. คู่มือการใช้งาน

The SMD DD-1 simplifies the process of setting amplifier gains and detecting distortion. Here's how to use it:

5.1. Understanding the Indicators

The DD-1 features several LED indicators and a level meter:

• Distortion LED: Illuminates when harmonic distortion exceeds 1.0%. This is your primary indicator for clipping.
• 1kHz Detect LED: Illuminates when a 1kHz test tone is detected.
• 40Hz Detect LED: Illuminates when a 40Hz test tone is detected.
• สัญญาณไฟ LED: Illuminates when an audio signal of at least 750 mVrms is present.
• Low Batt LED: จะสว่างขึ้นเมื่อแบตเตอรี่หมดtagค่า e ต่ำและจำเป็นต้องเปลี่ยนใหม่
• กำลังไฟ LED: Illuminates when the unit is turned on.

รูปที่ 5.1: รายละเอียด view of the DD-1's LED indicators.

The D'Amore Engineering level indicators at the bottom provide a visual representation of the signal level, ranging from -32dB to +3dB.

Figure 5.2: The D'Amore Engineering signal level meter.

5.2. Gain Setting Procedure

This procedure outlines the general steps for setting amplifier gains using the DD-1. Refer to your amplifier's manual for specific gain adjustment methods.

1. Disconnect Speakers: For safety and accurate measurement, disconnect your speakers from the ampเอาท์พุท lifier
2. Connect DD-1: Connect the DD-1's test leads to the amplifier's speaker output terminals (positive to positive, negative to negative).
3. Turn On DD-1: Press the "On" button on the DD-1. The "Power" LED should illuminate.
4. Set Source Unit Volume: Play the appropriate test tone from the DD-1 Test Tone Disc (e.g., 1kHz for full-range, 40Hz for subwoofers). Increase your source unit's volume to its maximum clean output level. This is typically 75-80% of the maximum volume, but the DD-1 will help you find the exact point.
5. ปรับ Amplifier กำไร: ค่อยๆ เพิ่มระดับเสียง (gain control) บนอุปกรณ์ของคุณ amplifier. Observe the "Distortion" LED on the DD-1.
6. Find Clean Signal: As you increase the gain, the "Signal" LED should be on. Continue increasing the gain until the "Distortion" LED just begins to flicker or illuminate steadily.
7. Set Gain Point: Once the "Distortion" LED illuminates, slightly decrease the amplifier gain until the "Distortion" LED turns off. This is your maximum clean gain setting.
8. Repeat for Other Channels: If you have a multi-channel amplifier, repeat this process for each channel or pair of channels.
9. Disconnect DD-1 and Reconnect Speakers: Once all gains are set, turn off the DD-1, disconnect it from the amplifier, and reconnect your speakers.

The DD-1's operating range of input signal is 1.2 Vrms to 125 Vrms, allowing it to be used with amplifiers producing up to 15,000 watts at 1 ohm.

6. การบำรุงรักษา

The SMD DD-1 is designed for durability and requires minimal maintenance.

• การทำความสะอาด: เช็ดตัวเครื่องด้วยผ้านุ่มและแห้ง ห้ามใช้น้ำยาทำความสะอาดที่มีฤทธิ์กัดกร่อนหรือตัวทำละลาย
• การเปลี่ยนแบตเตอรี่: When the "Low Batt" LED illuminates, replace the D battery promptly to ensure accurate readings.
• พื้นที่จัดเก็บ: Store the DD-1 in a cool, dry place away from direct sunlight and extreme temperatures.

7 การแก้ไขปัญหา

8. ข้อมูลจำเพาะ

9. การรับประกันและการสนับสนุน

For warranty information and technical support regarding your SMD Distortion Detector DD-1, please refer to the official SMD / D'amore Engineering website or contact their customer service directly. Specific warranty terms may vary and are typically provided with the product at the time of purchase.

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