Mastech MY68

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

Model: MY68

1. Introduktion

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. Sikkerhedsoplysninger

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.

  • Sørg altid for, at testledningerne er i god stand, fri for revner eller beskadiget isolering.
  • Påfør ikke mere end den nominelle voltage between terminals or between any terminal and earth ground. The maximum input for voltage is 1000V DC or 750V AC.
  • Brug de korrekte terminaler, funktioner og måleområde til dine målinger.
  • 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.
  • Vær forsigtig, når du arbejder med vol.tagover 60V DC eller 30V AC RMS, da disse udgør en fare for stød.
  • Frakobl altid testledningerne fra kredsløbet, før du ændrer funktioner eller områder.
  • Udskift batteriet med det samme, når indikatoren for lavt batteri vises, for at sikre nøjagtige aflæsninger.
  • Observe the CAT (Category) ratings: CAT III 600V and CAT II 1000V. Do not use the meter in environments exceeding these ratings.

3. Produktet er slutview

3.1. Display

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

Figur 1: Nærbillede 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. Drejekontakt

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

Figur 2: Nærbillede 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. Indgangsstik

  • COM: Fælles terminal for alle målinger. Tilslut den sorte testledning her.
  • VΩFCx: Indgangsterminal for 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

Figur 3: Nærbillede 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. Knapper

  • RÆKKEVIDDE: 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. Opsætning

4.1. Batteriinstallation

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

  1. Sørg for, at multimeteret er slukket, og at testledningerne er frakoblet.
  2. Find batteridækslet på bagsiden af ​​måleren.
  3. Skru fastholdelsesskruen(e) af, og fjern dækslet.
  4. Tilslut et nyt 9V-batteri til batteristikket, og sørg for korrekt polaritet.
  5. Placer batteriet i batterirummet, og sæt dækslet på igen, og fastgør det med skruen/skruerne.

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

4.2. Tilslutning af testledninger

For most measurements:

  • Tilslut sort testledning til KOM (fælles) stik.
  • Tilslut rød testledning til VΩFCx stik til lydstyrketage, resistance, frequency, or capacitance measurements.
  • For current measurements, connect the rød testledning til 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. Betjeningsvejledning

5.1. Måling af AC/DC-volumentage

  1. Connect the red lead to VΩFCx and the black lead to COM.
  2. Drej drejeknappen til den ønskede AC-lydstyrketage (V~) eller DC Voltage (V-) position.
  3. Tilslut testledningerne parallelt på tværs af det kredsløb eller den komponent, der skal måles.
  4. Læs bindtage -værdi på displayet.

5.2. Måling af AC/DC-strøm

  1. ADVARSEL: Sørg for, at kredsløbet er spændingsløst, før måleren serieforbindes.
  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. Åbn kredsløbet, hvor strømmen skal måles, og forbind måleren i serie.
  5. Tilslut strøm til kredsløbet, og aflæs strømværdien på displayet.
  6. VIGTIG: Never connect the meter in parallel when measuring current, as this will blow the fuse.

5.3. Måling af modstand

  1. ADVARSEL: Sørg for, at kredsløbet eller komponenten er spændingsløs, før du måler modstanden.
  2. Connect the red lead to VΩFCx and the black lead to COM.
  3. Drej drejekontakten til Ω (modstand) positionen.
  4. Tilslut testledningerne på tværs af den komponent, der skal måles.
  5. Læs modstandsværdien på displayet.

5.4. Måling af kapacitans

  1. ADVARSEL: 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. Tilslut testledningerne over kondensatoren.
  5. Læs kapacitansværdien på displayet.

5.5. Måling af frekvens

  1. Connect the red lead to VΩFCx and the black lead to COM.
  2. Turn the rotary switch to the Hz (Frequency) position.
  3. Tilslut testledningerne på tværs af signalkilden.
  4. Aflæs frekvensværdien på displayet.

5.6. Diodetest

  1. ADVARSEL: Ensure the diode or circuit is de-energized.
  2. Connect the red lead to VΩFCx and the black lead to COM.
  3. Drej drejekontakten til diodesymbolpositionen.
  4. Connect the red lead to the anode and the black lead to the cathode of the diode. The display will show the forward voltage drop.
  5. Reverse the leads. The display should show 'OL' (Open Loop) for a good diode.

5.7. Kontinuitetstest

  1. ADVARSEL: Sørg for, at kredsløbet eller komponenten er spændingsløs.
  2. Connect the red lead to VΩFCx and the black lead to COM.
  3. Drej drejekontakten til positionen for kontinuitetssymbolet.
  4. Tilslut testledningerne på tværs af kredsløbet eller komponenten.
  5. Hvis modstanden er under cirka 50Ω, lyder summeren, hvilket indikerer kontinuitet.

5.8. Transistortest (hFE)

  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. Datahold-funktion

Tryk på DATA-H knappen for at fryse den aktuelle aflæsning på displayet. Tryk igen for at slippe holdeknappen og genoptage live-aflæsningerne.

5.10. Range Selection (Manual Ranging)

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

6. Vedligeholdelse

6.1. Udskiftning af batteri

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

6.2. Udskiftning af sikring

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

  1. Sørg for, at multimeteret er slukket, og at testledningerne er frakoblet.
  2. Åbn batteridækslet som beskrevet i afsnit 4.1.
  3. Fjern forsigtigt den/de gamle sikring(er).
  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. Sæt batterirummets dæksel på igen og fastgør det.

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

6.3. Rensning

Tør måleren af ​​med reklameamp en klud og et mildt rengøringsmiddel. Brug ikke slibemidler eller opløsningsmidler. Hold terminalerne fri for snavs og fugt.

7. Fejlfinding

  • Intet display eller svagt display: Check battery. Replace if necessary.
  • Forkerte aflæsninger: Ensure correct function and range are selected. Check test lead connections. Verify the circuit is de-energized for resistance/capacitance.
  • Ingen aktuel aflæsning: Check if the fuse for the selected current range has blown. Replace if necessary (refer to Section 6.2).
  • 'OL' (Overbelastning) vises: 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. Specifikationer

The Mastech MY68 Digital Multimeter offers the following specifications:

  • Vise: 3 3/4 digits, 3260 counts maximum.
  • Automatisk/Manuel afstandsmåling: Ja.
  • Transistor (hFE) Test: Ja.
  • Test-AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency: Ja.
  • Strømkilde: 9V batteri.
  • Produktvægt: Cirka 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 Voltage, Resistance, Frequency, Capacitance, DC Current, and AC Current measurements.

9. Garanti og support

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.

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