คู่มือการใช้งานมัลติมิเตอร์ดิจิทัล True RMS รุ่น UNI-T UT89X/XD/XE

1. บทนำ

The UNI-T UT89X/UT89XD/UT89XE series are reliable hand-held digital multimeters designed for accurate and safe electrical measurements. These devices feature True RMS sine wave measurement, a bi-color durable case, and a modern exterior. They are suitable for a wide range of applications, from electronic component maintenance to electrical system engineering, especially for users who frequently need to distinguish between live and neutral wires using NCV measurement.

The UT89X and UT89XD models are 3 5/6 bit multimeters, while the UT89XE is a 20000-count (4 1/2 digit) true RMS multimeter offering higher resolution and precise measurements. All models are designed according to CAT II 1000V/CAT III 600V safety ratings, incorporating measurement overvoltage and overcurrent alarm prompts, and high voltage mismeasurement protection for all gears.

2. สินค้าหมดview

The multimeter features a robust design with a durable, anti-fall outer red protective layer made of high-quality rubber, ensuring shockproof and dustproof performance.

2.1. ส่วนประกอบและการควบคุม

• จอแอลซีดี: จอแสดงผลดิจิทัลสำหรับแสดงค่าการวัด
• Sound and Light Alarm Indicator: Provides audible and visual alerts.
• Automatic Backlight Sensing Window: ปรับความสว่างหน้าจอโดยอัตโนมัติ
• Back Flashlight: (UT89X/UT89XD only) For illuminating dark work areas.
• Function Switching / REL Measurement: Buttons for mode selection and relative measurement.
• Turn On/Off Automatic Backlight: Button to control backlight.
• Data Retention / Flashlight: Button to hold data or activate flashlight.
• Transistor Measurement Jack: For hFE transistor testing.
• Function Selection Switch: Rotary dial to select measurement functions.
• Insulating Protective Cover: Enhances safety and durability.
• mA/Microampere Current Jack: Input for small current measurements.
• 20A Current Gear Jack: อินพุตสำหรับการวัดกระแสไฟฟ้าสูง
• Public Jack (COM): Common input for all measurements.
• Input for Current File: Insert test lead here for current measurements.

2.2. เนื้อหาบรรจุภัณฑ์

1. Multimeter Unit
2. บัตรคำอธิบายตัวบ่งชี้
3. สายทดสอบ
4. Temperature Probe (UT89X only)
5. คู่มือการใช้งาน
6. กล่องบรรจุภัณฑ์
7. Gift Tools (may vary)

3. การตั้งค่า

3.1. การติดตั้งแบตเตอรี่

This device does not include batteries. Please install the required batteries (typically AA or 9V, refer to the battery compartment for exact type) before first use. Ensure correct polarity when inserting batteries.

3.2. การเชื่อมต่อสายทดสอบ

For most measurements, connect the black test lead to the COM (common) jack and the red test lead to the appropriate input jack based on the measurement type (e.g., VΩHz for voltage, resistance, frequency; mAμA for small currents; 20A for high currents).

4. คู่มือการใช้งาน

The multimeter offers a variety of measurement functions, selected using the rotary dial. Always ensure the correct function is selected and test leads are connected to the appropriate jacks before taking measurements.

4.1. การวัดค่า True RMS

The True RMS function allows for accurate measurement of non-sine wave power, which is crucial as current waveforms in some electrical appliances are not pure sine waves. This feature ensures precise readings even with distorted waveforms, unlike common methods that calculate average values and may introduce errors.

4.2. NCV (เครื่องวัดปริมาณสารแบบไม่สัมผัส)tagจ) การตรวจจับ

ฟังก์ชัน NCV ช่วยให้ตรวจจับปริมาณไฟฟ้ากระแสสลับได้โดยไม่ต้องสัมผัสtage, useful for identifying live wires without direct contact. The multimeter provides visual and audible indications based on the detected voltagระดับอี:

• Weak Sensing (12VAC-48VAC): ไฟสีเขียวกะพริบ
• Moderate Sensing (48VAC-220VAC): Yellow light flashes.
• Strong Sensing (>220VAC): ไฟสีแดงค้าง

4.3. Live Wire Detection (UT89X/UT89XD)

The UT89X and UT89XD models feature single test lead live wire detection. When the test lead is inserted into a live wire socket, the screen will display "LIVE", and a red LED will flash with an audible alarm. When connected to a neutral wire, the meter will not respond.

4.4. Temperature Measurement (UT89X/UT89XE only)

The UT89X and UT89XE models can measure temperature in the range of -40°C to 1000°C (-40°F to 1832°F). Use the included temperature probe and press the SEL/REL button to switch between Celsius and Fahrenheit units.

4.5. LED Test Function (UT89XD only)

The UT89XD model includes an LED test function, capable of outputting approximately 12V/5mA voltage to test LED performance. A solid green LED indicates normal status, while a red LED indicates an open circuit.

4.6. Other Measurement Functions

The multimeter can stably measure AC/DC current and voltage (up to 1000V/20A), resistance, capacitance, frequency, diode, and transistor hFE. It also features a continuity test with an audible alarm.

4.7. ไฟแบ็คไลท์และไฟฉาย

The multimeter is equipped with an automatic LCD backlight and a flashlight function, making it convenient for users to work in dark environments.

4.8. การสาธิตวิดีโอ

5. การบำรุงรักษา

5.1. การดูแลทั่วไป

To ensure the longevity and accuracy of your multimeter, keep it clean and dry. Avoid exposing it to extreme temperatures, humidity, or direct sunlight. Store it in a protective case when not in use.

5.2. การทำความสะอาด

เช็ดเครื่องเบาๆงamp cloth. Do not use abrasive cleaners or solvents. Ensure the device is completely dry before use or storage.

5.3. การเปลี่ยนแบตเตอรี่

When the low battery indicator appears on the LCD, replace the batteries promptly to maintain measurement accuracy. Refer to the battery compartment for the correct battery type and replacement procedure.

6 การแก้ไขปัญหา

• จอแสดงผล "OL": Indicates an over-range condition or an open circuit. Check if the measurement range is appropriate or if the circuit is complete.
• ไม่มีจอแสดงผล/จอแสดงผลจาง: ตรวจสอบระดับแบตเตอรี่และเปลี่ยนแบตเตอรี่หากจำเป็น ตรวจสอบให้แน่ใจว่าติดตั้งแบตเตอรี่อย่างถูกต้อง
• การอ่านค่าที่ไม่ถูกต้อง: Verify test lead connections, ensure the correct function is selected, and check battery level.
• ไม่มีการตรวจจับ NCV/สายไฟที่มีกระแสไฟฟ้า: Ensure the NCV function is activated and the sensor is close enough to the AC voltagแหล่งที่มา

7. ข้อมูลจำเพาะ

8. การรับประกันและการสนับสนุน

This product is certified with CE, FCC, and RoHS, ensuring compliance with international safety and environmental standards. For technical support or service inquiries, please contact your authorized UNI-T dealer or visit the official UNI-T webเว็บไซต์.

9. เคล็ดลับผู้ใช้

• Some models (like the UT89X) may include a temperature probe for HVAC system testing.
• The UT89XD model is equipped with an LED test function to check LED performance.
• The product may come with a cloth bag and combination test pen, enhancing portability and versatility.
• Always ensure the multimeter is set to the correct function and range to avoid damage to the device or inaccurate readings.