pengenalan
The Mastech MS8321D is a compact, manual-ranging digital multimeter designed for measuring AC/DC voltage, AC/DC current, resistance, temperature, diode, and continuity. It is suitable for a wide range of electrical testing applications in domestic, electronics, and industrial settings. This manual provides essential information for the safe and effective operation and maintenance of your device.
Maklumat Keselamatan
To ensure safe operation and service of the meter, please read this instruction manual thoroughly before use. Failure to observe safety warnings can result in electric shock, fire, or damage to the meter.
- Sentiasa gunakan fungsi dan julat yang betul untuk pengukuran.
- Jangan melebihi nilai input maksimum yang dinyatakan untuk setiap julat.
- Periksa wayar ujian untuk kerosakan sebelum setiap penggunaan. Jangan gunakan jika penebat terjejas.
- Ensure the meter is switched off and disconnected from the circuit before opening the battery compartment.
- Elakkan menggunakan meter dalam persekitaran basah atau semasa ribut elektrik.
- Always replace batteries when the low battery indicator appears to ensure accurate readings.
- Jangan cuba mengukur voltage or current on circuits exceeding the meter's rated capacity.
Ciri-ciri Produk
The Mastech MS8321D Digital Multimeter includes the following key features:
- Paparan: 2000 kiraan
- Manual Range selection
- Fungsi Auto Matikan
- Fungsi Pegangan Data
- Diod Voltan Terbukatage: 3.0V
- Continuity Buzzer: Activates at <40Ω
- Penunjuk Paparan Bateri Rendah
- Transistor hFE measurement: 0~1000
Kandungan Pakej
Upon opening the package, verify that all items listed below are present and undamaged. If any items are missing or damaged, contact your supplier.

Image showing the Mastech MS8321D Digital Multimeter, its main applications (domestic and electronics), and the included package contents.
- Meter Pelbagai Digital Mastech MS8321D
- Pemimpin Ujian
- 1x Bateri 9V 6F22
- Sijil Penentukuran
- Panduan Mula Pantas
Persediaan
Pemasangan Bateri
The Mastech MS8321D requires 2 LR44 batteries for operation, which are included. To install or replace the batteries:
- Ensure the multimeter is powered off and disconnect all test leads from the input terminals.
- Cari penutup petak bateri di belakang meter.
- Gunakan pemutar skru untuk melonggarkan skru yang mengikat penutup.
- Keluarkan penutup dengan berhati-hati.
- Insert the 2 LR44 batteries, observing the correct polarity (+ and - markings).
- Gantikan penutup petak bateri dan kencangkannya dengan skru.
Arahan Operasi
Berakhirview daripada Kawalan

Depan view of the Mastech MS8321D Digital Multimeter, showing the LCD display, rotary switch, function buttons, and input jacks.
The multimeter features a large LCD display for reading measurements, a central rotary switch for selecting measurement functions and ranges, and input jacks for connecting test leads.
Membuat Pengukuran
Follow these general steps for making measurements:
- Sambungkan Petunjuk Ujian: Insert the black test lead into the 'COM' (common) jack. Insert the red test lead into the appropriate input jack for your measurement type (e.g., 'VΩmA' for voltage, resistance, or small current; '20A' for high current measurements).
- Pilih Fungsi: Turn the rotary switch to the desired measurement function (e.g., V~ for AC Voltage, V- untuk DC Voltage, Ω for Resistance, A~ for AC Current, A- for DC Current, Diode, Continuity, hFE).
- Select Range (Manual Ranging): If the meter is manual ranging, select an appropriate range that is higher than the expected measurement value. If the value is unknown, start with the highest range and work downwards until a stable reading is obtained.
- Sambungkan ke Litar: Connect the test leads to the circuit or component you wish to measure. Ensure proper parallel connection for voltage measurements and series connection for current measurements.
- Baca Paparan: Observe the measurement value on the LCD display.
- Pegangan Data: Tekan butang 'HOLD' untuk membekukan bacaan semasa pada paparan. Tekan sekali lagi untuk melepaskan.
- Matikan: After use, turn the rotary switch to the 'OFF' position to conserve battery life. The meter also features an Auto Power Off function.
Penyelenggaraan
Pembersihan
Untuk membersihkan meter, lap bekas dengan iklanamp kain dan detergen lembut. Jangan gunakan bahan pelelas atau pelarut. Pastikan meter kering sepenuhnya sebelum digunakan.
Penggantian Bateri
When the 'Low Battery' indicator appears on the display, the batteries should be replaced promptly to ensure accurate measurements. Refer to the 'Battery Installation' section under Setup for detailed instructions.
Menyelesaikan masalah
If you encounter issues with your Mastech MS8321D, refer to the following common troubleshooting tips:
- Tiada Paparan atau Paparan Samar: Periksa pemasangan bateri dan pastikan bateri tidak habis. Gantikan bateri jika perlu.
- Bacaan yang salah: Verify that the correct function and range are selected for the measurement. Ensure test leads are properly connected to the meter and the circuit. Check for damaged test leads.
- Continuity Buzzer Not Working: Ensure the continuity function is selected and the circuit resistance is below 40Ω.
- Meter Tidak Dihidupkan: Check battery condition and installation. Ensure the rotary switch is not stuck between positions.
Spesifikasi
Detailed electrical specifications for the Mastech MS8321D are provided below:

Table detailing the range, resolution, and accuracy for various measurement functions of the MS8321D.
| Jenis Pengukuran | Julat | Resolusi | Ketepatan |
|---|---|---|---|
| DC Voltage | 200mV/2V/20V/200V 1000V | 0.1mV/1mV/10mV/0.1V 1V | ±(0.7%+1) ±(0.8%+2) |
| Vol. ACtage | 2V/20V/200V 750V | 1mV/10mV/0.1V 1V | ±(0.8%+3) ±(1.2%+3) |
| Arus DC | 200µA/2mA/20mA 200mA 20A | 0.1µA/1µA/10µA 0.1mA 0.01A | ±(1.0%+3) ±(1.5%+1) ±(2.0%+5) |
| AC Semasa | 2mA/20mA 200mA 20A | 1µA/10µA 0.1mA 0.01A | ±(1.2%+5) ±(1.8%+5) ±(3.0%+10) |
| Rintangan | 200Ω 2kΩ/20kΩ/200kΩ/2MΩ 20MΩ | 0.1Ω 1Ω/10Ω/0.1kΩ/1kΩ 10kΩ | ±(1.0%+3) ±(1.0%+1) ±(1.0%+5) |
Spesifikasi Umum
- Dimensi Produk: 16 x 9 x 5 cm
- Berat Barang: 0.5 Kilogram
- Power Source: Battery Powered (2 LR44 batteries included)
- Min. Operasi Voltage: 3 Volt
- Penilaian Suhu Atas: 50 Darjah Celsius
- Specification Met: CE, RoHS
- Pengilang: MASTECH/MGL
- Negara Asal: Taiwan
Waranti dan Sokongan
For detailed warranty information, technical support, or service inquiries regarding your Mastech MS8321D Digital Multimeter, please refer to the documentation included with your product or visit the official Mastech website. Contact information for customer support is typically provided in the Quick Start Guide or on the manufacturer's webtapak.