Mastech MS8251A digitalt multimeter brugermanual

1. Introduktion

Tak for købetasing the Mastech MS8251A Digital Multimeter. This device is a portable, professional measuring instrument with a large LCD display, providing clear and easy-to-read results. It is designed for use in laboratories, factories, and homes, offering a wide range of functions including AC/DC voltage, AC/DC strøm, modstand, kapacitans, frekvens, duty cycle, temperatur, diode, kontinuitet og berøringsfri voltage (NCV) detektion.

Please read this manual thoroughly before using the meter to ensure safe and proper operation. Keep this manual for future reference.

2. Sikkerhedsoplysninger

ADVARSEL: To avoid possible electric shock or personal injury, and to avoid possible damage to the meter or to the equipment under test, follow these instructions:

• Always ensure the meter is in the correct function and range for the measurement being performed.
• Påfør ikke mere end den nominelle voltage, som markeret på måleren, mellem terminalerne eller mellem en hvilken som helst terminal og jord.
• Vær forsigtig med voltagover 30V AC RMS, 42V peak eller 60V DC. Disse voluminertages udgør en stødfare.
• Før du foretager strømmålinger, skal du sørge for, at målerens sikringer er intakte, og at testledningerne er tilsluttet de korrekte indgangsstik.
• Afbryd strømmen til kredsløbet og aflade alle højspændingsledningertage kondensatorer før test af modstand, kontinuitet, dioder eller kapacitans.
• Do not use the meter if it is damaged or if the case (or part of the case) is removed. Inspect the meter before use.
• Betjen ikke måleren omkring eksplosiv gas, dampe eller støv.
• Brug kun specificerede reservedele ved servicering af måleren.
• Always use approved test leads.
• Brug ikke måleren, hvis batteridækslet ikke er lukket korrekt.
• Fjern testledningerne fra måleren, før du åbner batteridækslet.

3. Nøglefunktioner

• Display: 6600 tæller
• Automatisk områdemåling og manuel områdemåling
• Automatic Power Off function to conserve battery life
• Relativ måletilstand
• Non-Contact Voltage (NCV) Detector for safety
• Diode åben volumentage: 3.2V
• Continuity Buzzer for quick circuit checks
• MAX/MIN value recording
• Data Hold function to freeze readings
• Indikator for lavt batteriniveau
• Skærmbaggrundsbelysning for synlighed under dårlige lysforhold

Figur 3.1: Overview of Mastech MS8251A features, main applications, and included contents. This image illustrates the versatility of the multimeter across domestic, industrial, and electronics applications, highlighting its core functionalities and what comes in the box.

4. Produktkomponenter og deroverview

The Mastech MS8251A Digital Multimeter is designed for ease of use and durability. Familiarize yourself with its main parts:

• LCD-skærm: Viser måleaflæsninger, enheder og funktionsindikatorer.
• Funktionsknapper: REL△, RANGE, MAX/MIN, HOLD, FUNC, NCV, Backlight.
• Drejekontakt: Selects the desired measurement function (e.g., V~, V—, Ω, A~, A—, Temp, Diode, Continuity, Hz%).
• Indgangsstik:
• COM: Fælles terminal til alle mål.
• VΩHz%Temp→←: Input til bdtage, resistance, frequency, duty cycle, temperature, diode, and continuity measurements.
• mAμA: Input for milliampere og mikroamperestrømsmålinger.
• 10A: Input til 10 Amperestrømmålinger (sikring).

Figur 4.1: Forside view of the Mastech MS8251A Digital Multimeter, showing the LCD display, function buttons, rotary switch, and input jacks. This image provides a clear visual reference for identifying the various parts of the device.

5. Opsætning

5.1. Batteriinstallation

The Mastech MS8251A requires 2 LR44 batteries (included). To install or replace batteries:

1. Ensure the meter is turned OFF and disconnect all test leads from the input terminals.
2. Find batterirummet på bagsiden af ​​måleren.
3. Brug en skruetrækker til at løsne skruen/skruerne på batteridækslet.
4. Fjern batteridækslet.
5. Insert the 2 LR44 batteries, observing the correct polarity (+ and -).
6. Sæt batteridækslet på igen, og spænd skruen/skruerne.

5.2. Tilslutning af testledninger

Always connect the common (black) test lead to the COM jack. Connect the red test lead to the appropriate input jack based on the measurement you intend to make:

• For bindtage, Resistance, Capacitance, Frequency, Duty Cycle, Temperature, Diode, and Continuity measurements, connect the red lead to the VΩHz%Temp→← stik.
• For milliampere (mA) eller mikroampere (μA) current measurements, connect the red lead to the mAμA stik.
• For 10 Ampere (10A) current measurements, connect the red lead to the 10A stik.

6. Betjeningsvejledning

Before any measurement, ensure the test leads are correctly connected and the rotary switch is set to the desired function.

6.1. Generel drift

• Tænd/sluk: Turn the rotary switch from OFF to any function to power on. Turn to OFF to power off.
• Automatisk sluk: The meter will automatically power off after approximately 15 minutes of inactivity to save battery. Press any button or turn the rotary switch to wake it up.
• Baggrundsbelysning: Press the ★ button to turn the display backlight on or off.
• Data Hold: Tryk på HOLD-knappen for at fryse den aktuelle aflæsning på displayet. Tryk igen for at slippe.
• MAX / MIN: Press the MAX/MIN button to enter MAX/MIN recording mode. The meter will display the maximum or minimum reading detected. Press again to cycle between MAX, MIN, and current reading. Hold to exit.
• RÆKKEVIDDE: In auto-ranging mode, press RANGE to switch to manual ranging. Press repeatedly to cycle through available ranges. Hold to return to auto-ranging.
• REL△ (Relative Measurement): Press REL△ to store the current reading as a reference value. Subsequent readings will be displayed as the difference from this reference. Press again to exit.
• FUNC: In multi-function positions (e.g., Diode/Continuity/Temp), press FUNC to cycle through the available sub-functions.

6.2. Specifikke målefunktioner

Below are common measurement procedures. Always refer to the specifications for ranges and accuracy.

6.2.1. DC Voltage Measurement (V—)

1. Set the rotary switch to the V— position.
2. Connect the black test lead to the COM jack and the red test lead to the VΩHz%Temp→← jack.
3. Connect the test leads across the component or circuit to be measured in parallel.
4. Læs bindtage -værdi på displayet.

6.2.2. AC Voltage Måling (V~)

1. Set the rotary switch to the V~ position.
2. Connect the black test lead to the COM jack and the red test lead to the VΩHz%Temp→← jack.
3. Connect the test leads across the component or circuit to be measured in parallel.
4. Læs bindtage -værdi på displayet.

6.2.3. Modstandsmåling (Ω)

1. Set the rotary switch to the Ω position.
2. Connect the black test lead to the COM jack and the red test lead to the VΩHz%Temp→← jack.
3. Sørg for, at kredsløbet er spændingsløst, før du måler modstanden.
4. Connect the test leads across the resistor or component.
5. Læs modstandsværdien på displayet.

6.2.4. Continuity Test (→←)

1. Set the rotary switch to the →← position. Press FUNC if necessary to select continuity.
2. Connect the black test lead to the COM jack and the red test lead to the VΩHz%Temp→← jack.
3. Sørg for, at kredsløbet er spændingsløst.
4. Connect the test leads across the circuit or component. If resistance is less than approximately 50Ω, the buzzer will sound, indicating continuity.

6.2.5. Diode Test (→←)

1. Set the rotary switch to the →← position. Press FUNC if necessary to select diode test.
2. Connect the black test lead to the COM jack and the red test lead to the VΩHz%Temp→← jack.
3. Sørg for, at kredsløbet er spændingsløst.
4. Tilslut den røde testledning til anoden og den sorte testledning til katoden på dioden. Displayet viser den fremadrettede lydstyrke.tage drop. Reverse the leads; the display should show OL (Open Loop) for a good diode.

6.2.6. Non-Contact Voltage (NCV) Detektion

1. Indstil drejekontakten til NCV-positionen.
2. Move the top end of the meter close to the AC voltage source (e.g., a live wire).
3. The meter will beep and the NCV indicator light will flash if AC voltage is detected. The frequency of beeps and flashes increases with stronger signals.

For other functions like Current (AC/DC), Capacitance, Frequency, Duty Cycle, and Temperature, follow similar steps, ensuring the rotary switch is set to the correct function and test leads are connected to the appropriate input jacks.

7. Vedligeholdelse

7.1. Rensning

Tør sagen af ​​med annonceamp cloth and mild detergent. Do not use abrasives or solvents. Keep the terminals free from dirt or dust, which can affect readings.

7.2. Udskiftning af batteri

When the low battery indicator appears on the display, replace the batteries immediately to ensure accurate readings. Refer to Section 5.1 for battery installation instructions.

7.3. Udskiftning af sikring

If the meter fails to measure current, the fuse may be blown. To replace the fuse:

1. Ensure the meter is turned OFF and disconnect all test leads.
2. Åbn batterirummet som beskrevet i afsnit 5.1.
3. Locate the fuse(s). The MS8251A typically uses a 10A fuse for the 10A input and a 600mA fuse for the mA/μA input.
4. Carefully remove the old fuse and replace it with a new fuse of the same type and rating.
5. Sæt batteridækslet på igen, og spænd skruen/skruerne.

Note: Always use fuses with the specified voltage and current ratings for safety and proper operation.

8. Fejlfinding

9. Specifikationer

9.1. Generelle specifikationer

• Produktdimensioner: 7.87 x 5.91 x 9.84 tommer (200 x 150 x 250 mm)
• Varens vægt: 2.2 Pounds (1 Kilogram)
• Farve: Blå
• Strømkilde: Batteridrevet (2 LR44-batterier, medfølger)
• Fabrikant: MASTECH
• Modelnummer: YQ-MS8251A
• Sikkerhedsvurdering: CAT III 600V, CAT II 1000V

9.2. Elektriske specifikationer

Figure 9.1: Detailed electrical specifications for the Mastech MS8251A, including ranges, resolutions, and accuracy for various measurement functions such as DC Voltage, AC Voltage, DC Current, AC Current, Resistance, Capacitance, Frequency, and Duty Cycle.

Figure 9.2: Comparison table highlighting features and specifications across various Mastech digital multimeters, including the MS8251A, providing context on its capabilities relative to other models.

10. Garanti

The Mastech MS8251A Digital Multimeter comes with a 1 års begrænset garanti from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by misuse, accident, unauthorized repair, neglect, or modification. Please retain your purchase receipt as proof of purchase for warranty claims.

11. Support

For technical support, troubleshooting assistance, or warranty inquiries, please contact Mastech customer service. You can find more information and contact details on the official Mastech webhjemmeside eller gennem den forhandler, hvor du købte produktet.

Besøg Mastech-butik på Amazon for yderligere produktinformation og supportressourcer.