Mastech MY68

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

Model: MY68

1. Rhagymadrodd

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. Gwybodaeth Diogelwch

Please read and understand all safety information before operating this multimeter. Failure to follow these instructions may result in electric shock, fire, or damage to the meter or the equipment under test.

  • Always ensure the test leads are in good condition, free from cracks or damaged insulation.
  • Peidiwch â chymhwyso mwy na'r cyftage 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.
  • Be cautious when working with voltaguwchlaw 60V DC neu 30V AC RMS, gan fod y rhain yn peri perygl sioc.
  • Datgysylltwch y gwifrau prawf o'r gylched bob amser cyn newid swyddogaethau neu ystodau.
  • Amnewidiwch y batri ar unwaith pan fydd y dangosydd batri isel yn ymddangos i sicrhau darlleniadau cywir.
  • Observe the CAT (Category) ratings: CAT III 600V and CAT II 1000V. Do not use the meter in environments exceeding these ratings.

3. Cynnyrch Drosview

3.1. Arddangos

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

Ffigur 1: Agos 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. Newid Rotari

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

Ffigur 2: Agos 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: Terfynell gyffredin ar gyfer pob mesuriad. Cysylltwch y wifren brawf ddu yma.
  • VΩFCx: Terfynell fewnbwn ar gyfer cyftage, 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

Ffigur 3: Agos 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. botymau

  • YSTOD: 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. Gosod

4.1. Gosod Batri

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

  1. Gwnewch yn siŵr bod y multimedr wedi'i ddiffodd a bod y gwifrau prawf wedi'u datgysylltu.
  2. Lleolwch glawr adran y batri ar gefn y mesurydd.
  3. Dadsgriwiwch y sgriw(iau) cadw a thynnwch y gorchudd.
  4. Cysylltwch fatri 9V newydd â chysylltydd y batri, gan arsylwi'r polaredd cywir.
  5. Rhowch y batri yn y compartment ac ailosodwch y clawr, gan ei sicrhau gyda'r sgriw(iau).

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

4.2. Cysylltu Gwifrau Prawf

For most measurements:

  • Cysylltwch y du test lead to the COM jac (cyffredin).
  • Cysylltwch y coch test lead to the VΩFCx jack for voltage, resistance, frequency, or capacitance measurements.
  • For current measurements, connect the coch test lead to the 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. Cyfarwyddiadau Gweithredu

5.1. Measuring AC/DC Voltage

  1. Connect the red lead to VΩFCx and the black lead to COM.
  2. Trowch y switsh cylchdro i'r Cyfaint AC a ddymunirtage (V~) neu DC Voltage (V-) position.
  3. Cysylltwch y gwifrau prawf yn gyfochrog ar draws y gylched neu'r gydran i'w mesur.
  4. Darllenwch y cyftage gwerth ar yr arddangosfa.

5.2. Measuring AC/DC Current

  1. RHYBUDD: Gwnewch yn siŵr bod y gylched wedi'i dad-egni cyn cysylltu'r mesurydd mewn cyfres.
  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. Agorwch y gylched lle mae'r cerrynt i'w fesur a chysylltwch y mesurydd mewn cyfres.
  5. Rhowch bŵer i'r gylched a darllenwch y gwerth cerrynt ar yr arddangosfa.
  6. PWYSIG: Never connect the meter in parallel when measuring current, as this will blow the fuse.

5.3. Mesur Gwrthsafiad

  1. RHYBUDD: Gwnewch yn siŵr bod y gylched neu'r gydran wedi'i dad-egnïo cyn mesur gwrthiant.
  2. Connect the red lead to VΩFCx and the black lead to COM.
  3. Trowch y switsh cylchdro i'r safle Ω (Gwrthiant).
  4. Cysylltwch y gwifrau prawf ar draws y gydran i'w mesur.
  5. Darllenwch y gwerth gwrthiant ar yr arddangosfa.

5.4. Mesur Cynhwysedd

  1. RHYBUDD: 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. Cysylltwch y gwifrau prawf ar draws y cynhwysydd.
  5. Darllenwch y gwerth cynhwysedd ar yr arddangosfa.

5.5. Mesur Amlder

  1. Connect the red lead to VΩFCx and the black lead to COM.
  2. Trowch y switsh cylchdro i'r safle Hz (Amledd).
  3. Cysylltwch y gwifrau prawf ar draws y ffynhonnell signal.
  4. Darllenwch y gwerth amledd ar yr arddangosfa.

5.6. Prawf Deuod

  1. RHYBUDD: Ensure the diode or circuit is de-energized.
  2. Connect the red lead to VΩFCx and the black lead to COM.
  3. Turn the rotary switch to the Diode symbol position.
  4. Cysylltwch y plwm coch â'r anod a'r plwm du â chatod y deuod. Bydd yr arddangosfa'n dangos y gyfaint ymlaen.tage gollwng.
  5. Gwrthdrowch y gwifrau. Dylai'r arddangosfa ddangos 'OL' (Dolen Agored) am ddeuod da.

5.7. Prawf Parhad

  1. RHYBUDD: Ensure the circuit or component is de-energized.
  2. Connect the red lead to VΩFCx and the black lead to COM.
  3. Turn the rotary switch to the Continuity symbol position.
  4. Cysylltwch y gwifrau prawf ar draws y gylched neu'r gydran.
  5. Os yw'r gwrthiant yn is na thua 50Ω, bydd y swnyn yn swnio, gan nodi parhad.

5.8. Transistor (hFE) Test

  1. Trowch y switsh cylchdro i'r safle hFE.
  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. Darllenwch y gwerth hFE (enillion cerrynt DC) ar yr arddangosfa.

5.9. Swyddogaeth Dal Data

Gwasgwch y DATA-H botwm i rewi'r darlleniad cyfredol ar yr arddangosfa. Pwyswch ef eto i ryddhau'r daliad ac ailddechrau darlleniadau byw.

5.10. Range Selection (Manual Ranging)

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

6. cynnal

6.1. Amnewid Batri

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

6.2. Amnewid Ffiws

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

  1. Gwnewch yn siŵr bod y multimedr wedi'i ddiffodd a bod y gwifrau prawf wedi'u datgysylltu.
  2. Open the battery compartment cover as described in Section 4.1.
  3. Carefully remove the old fuse(s).
  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. Amnewid y clawr adran batri a'i ddiogelu.

Always use fuses with the specified voltage and current ratings to prevent damage to the meter or personal injury.

6.3. Glanhau

Sychwch y mesurydd gydag hysbysebamp cloth and mild detergent. Do not use abrasives or solvents. Keep the terminals free from dirt and moisture.

7. Datrys Problemau

  • Dim arddangosfa neu arddangosfa dywyll: Check battery. Replace if necessary.
  • Darlleniadau anghywir: 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' (Gorlwytho) wedi'i arddangos: 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. manylebau

The Mastech MY68 Digital Multimeter offers the following specifications:

  • Arddangos: 3 3/4 digits, 3260 counts maximum.
  • Auto/Manual Ranging: Oes.
  • Transistor (hFE) Test: Oes.
  • Test-AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency: Oes.
  • Ffynhonnell Pwer: Batri 9V.
  • Pwysau Cynnyrch: Tua 1.1 pwys (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, AC Cyftage, Resistance, Frequency, Capacitance, DC Current, and AC Current measurements.

9. Gwarant a Chefnogaeth

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.

Ask a question about this manual

Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.