Mastech MY68

Mastech MY68 3 3/4 3260-Count Auto-Ranging AC/DC Digital Multimeter User Manual

Model: MY68

1. Pengenalan

The Mastech MY68 is a compact, auto-ranging digital multimeter designed for measuring AC/DC voltage, AC/DC current, resistance, capacitance, and frequency. It also includes functions for diode testing, continuity checking, and transistor (hFE) testing. Featuring a 3 3/4 digit display with a maximum reading of 3260 counts, this device is suitable for a wide range of electrical and electronic troubleshooting tasks.

2. Maklumat Keselamatan

Sila baca dan fahami semua maklumat keselamatan sebelum mengendalikan multimeter ini. Kegagalan untuk mengikuti arahan ini boleh mengakibatkan renjatan elektrik, kebakaran, atau kerosakan pada meter atau peralatan yang sedang diuji.

  • Always ensure the test leads are in good condition, free from cracks or damaged insulation.
  • Jangan gunakan lebih daripada vol yang dinilaitage between terminals or between any terminal and earth ground. The maximum input for voltage is 1000V DC or 750V AC.
  • Use the correct terminals, function, and range for your measurements.
  • Never measure current on a circuit with voltage present without first ensuring the circuit is de-energized or the meter is properly connected in series.
  • Berhati-hati semasa bekerja dengan voltagadalah melebihi 60V DC atau 30V AC RMS, kerana ini menimbulkan bahaya kejutan.
  • Sentiasa putuskan sambungan petunjuk ujian daripada litar sebelum menukar fungsi atau julat.
  • Gantikan bateri dengan segera apabila penunjuk bateri lemah muncul untuk memastikan bacaan yang tepat.
  • Observe the CAT (Category) ratings: CAT III 600V and CAT II 1000V. Do not use the meter in environments exceeding these ratings.

3. Produk Lebihview

3.1. Paparan

The MY68 features a 3 3/4 digit liquid crystal display (LCD) capable of showing up to 3260 counts. It indicates measurement values, units, function modes, auto-ranging status, data hold, and low battery.

Mastech MY68 Multimeter Display

Rajah 1: Jarak dekat view of the Mastech MY68 multimeter display. The display shows the 3 3/4 digit reading area, along with indicators for AUTO range, DC/AC voltage, current, resistance, capacitance, frequency, diode, continuity, hFE, and battery status.

3.2. Suis Putar

The central rotary switch is used to select the desired measurement function. Turn the switch to the appropriate position for voltage, current, resistance, capacitance, frequency, diode, continuity, or hFE tests. Always ensure the meter is OFF when not in use.

Mastech MY68 Multimeter Rotary Switch

Rajah 2: Jarak dekat view of the Mastech MY68 multimeter's rotary switch. The switch allows selection between various functions including OFF, AC/DC Voltage (V~, V-), Resistance (Ω), Capacitance (Cap), Frequency (Hz), hFE, Diode/Continuity, and AC/DC Current (µA, mA, A).

3.3. Input Jacks

  • COM: Common terminal for all measurements. Connect the black test lead here.
  • VΩFCx: Terminal input untuk voltage, resistance, frequency, and capacitance measurements. Connect the red test lead here.
  • mA: Input terminal for current measurements up to 400mA. Fused. Connect the red test lead here for mA measurements.
  • A: Input terminal for current measurements up to 10A. Fused. Connect the red test lead here for A measurements.
Mastech MY68 Multimeter Input Jacks

Rajah 3: Jarak dekat view of the Mastech MY68 multimeter's input jacks. From left to right: 10A MAX (fused), 400mA MAX (fused), COM (common), and VΩFCx (Voltage, Resistance, Frequency, Capacitance). Safety warnings for CAT III 600V and CAT II 1000V are also visible.

3.4. Butang

  • RANGE: Toggles between auto-ranging and manual ranging modes. In manual mode, press to cycle through available ranges.
  • DATA-H: Holds the current displayed reading. Press again to release.

4. Persediaan

4.1. Pemasangan Bateri

The MY68 multimeter is powered by a 9V battery (not included). To install or replace the battery:

  1. Pastikan multimeter dimatikan dan petunjuk ujian diputuskan.
  2. Cari penutup petak bateri di belakang meter.
  3. Tanggalkan skru penahan dan tanggalkan penutup.
  4. Connect a new 9V battery to the battery connector, observing correct polarity.
  5. Letakkan bateri ke dalam petak dan gantikan penutup, selamatkannya dengan skru.

If the low battery indicator appears on the display, replace the battery promptly to maintain measurement accuracy.

4.2. Menghubungkan Petunjuk Ujian

For most measurements:

  • Sambungkan hitam ujian membawa kepada COM jek (biasa).
  • Sambungkan merah ujian membawa kepada VΩFCx jack for voltage, rintangan, kekerapan atau ukuran kapasiti.
  • For current measurements, connect the merah ujian membawa kepada mA jack (for up to 400mA) or the A jack (for up to 10A).

Always ensure test leads are securely inserted before taking measurements.

5. Arahan Operasi

5.1. Measuring AC/DC Voltage

  1. Connect the red lead to VΩFCx and the black lead to COM.
  2. Putar suis putar kepada Voltan AC yang dikehendakitage (V~) atau Voltan DCtage (V-) position.
  3. Connect the test leads in parallel across the circuit or component to be measured.
  4. Baca voltagnilai e pada paparan.

5.2. Measuring AC/DC Current

  1. AMARAN: Pastikan litar dinyahtenagakan sebelum menyambungkan meter secara bersiri.
  2. Connect the black lead to COM. Connect the red lead to the mA jack (for current up to 400mA) or the A jack (for current up to 10A).
  3. Turn the rotary switch to the desired AC Current (A~, mA~, µA~) or DC Current (A-, mA-, µA-) position.
  4. Buka litar di mana arus akan diukur dan sambungkan meter secara bersiri.
  5. Apply power to the circuit and read the current value on the display.
  6. PENTING: Never connect the meter in parallel when measuring current, as this will blow the fuse.

5.3. Mengukur Rintangan

  1. AMARAN: Pastikan litar atau komponen dinyahtenagakan sebelum mengukur rintangan.
  2. Connect the red lead to VΩFCx and the black lead to COM.
  3. Turn the rotary switch to the Ω (Resistance) position.
  4. Sambungkan petunjuk ujian merentasi komponen yang akan diukur.
  5. Baca nilai rintangan pada paparan.

5.4. Measuring Capacitance

  1. AMARAN: Ensure the capacitor is fully discharged before measuring capacitance.
  2. Connect the red lead to VΩFCx and the black lead to COM.
  3. Turn the rotary switch to the Cap (Capacitance) position.
  4. Sambungkan petunjuk ujian merentasi kapasitor.
  5. Baca nilai kapasitans pada paparan.

5.5. Mengukur Kekerapan

  1. Connect the red lead to VΩFCx and the black lead to COM.
  2. Turn the rotary switch to the Hz (Frequency) position.
  3. Sambungkan wayar ujian merentasi sumber isyarat.
  4. Baca nilai kekerapan pada paparan.

5.6. Ujian Diod

  1. AMARAN: Ensure the diode or circuit is de-energized.
  2. Connect the red lead to VΩFCx and the black lead to COM.
  3. Putar suis putar ke kedudukan simbol Diod.
  4. Sambungkan plumbum merah ke anod dan plumbum hitam ke katod diod. Paparan akan menunjukkan vol ke hadapantage penurunan.
  5. Songsangkan wayar. Paparan hendaklah menunjukkan 'OL' (Gelung Terbuka) untuk diod yang baik.

5.7. Ujian Kesinambungan

  1. AMARAN: Pastikan litar atau komponen dinyahtenagakan.
  2. Connect the red lead to VΩFCx and the black lead to COM.
  3. Putar suis putar ke kedudukan simbol Kesinambungan.
  4. Sambungkan petunjuk ujian merentasi litar atau komponen.
  5. Jika rintangan berada di bawah kira-kira 50Ω, buzzer akan berbunyi, menunjukkan kesinambungan.

5.8. Transistor (hFE) Test

  1. Turn the rotary switch to the hFE position.
  2. Identify the type (NPN or PNP) and pin configuration (EBC) of the transistor.
  3. Insert the transistor leads into the corresponding holes in the hFE socket on the meter.
  4. Read the hFE value (DC current gain) on the display.

5.9. Fungsi Pegangan Data

Tekan ke DATA-H button to freeze the current reading on the display. Press it again to release the hold and resume live readings.

5.10. Range Selection (Manual Ranging)

The MY68 operates in auto-ranging mode by default. To select a specific range manually, press the JULAT button. Each press will cycle through the available ranges for the selected function. To return to auto-ranging, press and hold the JULAT button for a few seconds, or turn the rotary switch to a different function and then back.

6. Penyelenggaraan

6.1. Penggantian Bateri

When the battery symbol appears on the display, the 9V battery needs to be replaced. Refer to Section 4.1 for instructions.

6.2. Penggantian fius

If the current measurement functions (mA or A) stop working, the corresponding fuse may have blown. To replace a fuse:

  1. Pastikan multimeter dimatikan dan petunjuk ujian diputuskan.
  2. Buka penutup petak bateri seperti yang diterangkan dalam Bahagian 4.1.
  3. Tanggalkan fius lama dengan berhati-hati.
  4. Replace with new fuses of the correct type and rating:
    • For 400mA input: 0.5A/250V fast-acting fuse.
    • For 10A input: 10A/250V fast-acting fuse.
  5. Gantikan penutup petak bateri dan selamatkannya.

Sentiasa gunakan fius dengan volum yang dinyatakantage and current ratings to prevent damage to the meter or personal injury.

6.3. Pembersihan

Lap meter dengan iklanamp kain dan detergen lembut. Jangan gunakan bahan kasar atau pelarut. Pastikan terminal bebas daripada kotoran dan kelembapan.

7. Penyelesaian masalah

  • Tiada paparan atau paparan malap: Periksa bateri. Gantikan jika perlu.
  • Bacaan yang salah: Ensure correct function and range are selected. Check test lead connections. Verify the circuit is de-energized for resistance/capacitance.
  • No current reading: Check if the fuse for the selected current range has blown. Replace if necessary (refer to Section 6.2).
  • 'OL' (Lebihan) dipaparkan: The measured value exceeds the selected range. If in manual range, select a higher range. If in auto-range, the value exceeds the meter's maximum capability.

8. Spesifikasi

The Mastech MY68 Digital Multimeter offers the following specifications:

  • paparan: 3 3/4 digits, 3260 counts maximum.
  • Pengisaran Auto/Manual: ya.
  • Transistor (hFE) Test: ya.
  • Test-AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency: ya.
  • Sumber Kuasa: Bateri 9V.
  • Berat produk: Kira-kira 1.1 paun (0.5 kg).
  • UPC: 849649088990.

Detailed measurement ranges, resolutions, and accuracies are provided in the table below:

Mastech MY68 Multimeter Specifications Table

Figure 4: Detailed specifications table for the Mastech MY68 multimeter, including ranges, resolutions, and accuracies for DC Voltage, Vol. ACtage, Resistance, Frequency, Capacitance, DC Current, and AC Current measurements.

9. Waranti dan Sokongan

For warranty information or technical support, please refer to the documentation provided with your purchase or contact your local Mastech distributor. Keep your purchase receipt as proof of purchase.