The MAJOR TECH MT22 is a compact digital multimeter designed for a wide range of electrical measurements, offering both auto-ranging and manual selection capabilities. It is a 2000-count liquid crystal display (LCD) device with symbolic signs for various functions and indications.
Function Description:
The MT22 multimeter is capable of measuring:
- DC Voltage: Up to 1000V.
- AC Voltage: Up to 1000V.
- DC Current: Up to 10A.
- AC Current: Up to 10A.
- Resistance: Up to 20MΩ.
- Temperature: From -50°C to +1000°C (-58°F to +1832°F).
- Diode Test: With a typical open circuit voltage of 1.5V DC.
- Continuity Check: With an audible threshold of less than 100Ω.
- Clamp-on Adaptor AC/DC Current: For measurements up to 2000A, requiring an external clamp-on adaptor (not provided).
Important Technical Specifications:
- Display: 2000 counts LCD with function indication.
- Polarity: Automatic, with a (-) negative polarity indication.
- Overrange Indication: "OL" mark.
- Low Battery Indication: "BAT" displayed when battery voltage drops below operating level.
- Measurement Rate: 2 times per second, nominal.
- Auto Power Off: Automatically shuts down after approximately 15 minutes of inactivity.
- Operating Environment: 0°C to 50°C (32°F to 122°F) at < 70% relative humidity.
- Storage Temperature: -20°C to 60°C (-4°F to 140°F) at < 80% relative humidity.
- Max Height for Inside Use: 2000m.
- Pollution Degree: 2.
- Power: One 9V battery, NEDA 1604, IEC 6F22.
- Dimensions: 150 (H) x 70 (W) x 48 (D) mm.
- Weight: Approximately 255g.
- Safety Compliance: EN61010-1.
- Insulation: Class 2, Double insulation.
- Overvoltage Category: CAT III 600V, CAT II 1000V.
- Input Impedance (Voltage Ranges): 10MΩ.
- Frequency Range (AC Voltage/Current): 50 to 60Hz.
- Overload Protection (Current Ranges): 0.2A / 250V and 10A / 250V Fuses.
- Temperature Sensor: Type K Thermocouple.
- Clamp-on Adaptor Input Sensitivity: 1mV/A for both 200A and 2000A ranges.
Accuracy (at 18°C to 28°C, < 70% RH):
- DC Voltage:
- 200.0mV: ±0.5% of rdg ±2 dgts
- 2.000V, 20.00V, 200.0V: ±1.2% of rdg ±2 dgts
- 600V (CAT III), 1000V (CAT II): ±1.5% of rdg ±2 dgts (600V), ±1.5% of rdg ±4 dgts (1000V)
- AC Voltage (except 200mV):
- 200.0mV: ±1.5% of rdg ±30 dgts
- 2.000V, 20.00V, 200.0V: ±1.2% of rdg ±3 dgts (2.000V), ±1.5% of rdg ±3 dgts (20.00V, 200.0V)
- 600V (CAT III), 1000V (CAT II): ±2.0% of rdg ±4 dgts (600V), ±2.0% of rdg ±8 dgts (1000V)
- DC Current (uA and mA):
- 200.0uA, 2000uA: ±1.0% of rdg ±3 dgts
- 20.00mA, 200.0mA: ±1.5% of rdg ±3 dgts
- 10A: ±2.5% of rdg ±5 dgts
- AC Current (uA and mA):
- 200.0uA, 2000uA: ±1.5% of rdg ±5 dgts
- 20.00mA, 200.0mA: ±1.8% of rdg ±5 dgts
- 10A: ±3.0% of rdg ±7 dgts
- Clamp-on Adaptor DC Current: ±1.0% of rdg ±3dgts (meter only, adaptor accuracy not included).
- Clamp-on Adaptor AC Current: ±1.5% of rdg ±3dgts (meter only, adaptor accuracy not included).
- Resistance:
- 200.0Ω: ±1.2% of rdg ±4 dgts
- 2.000KΩ: ±1.0% of rdg ±2 dgts
- 20.00KΩ, 200.0KΩ: ±1.2% of rdg ±2 dgts
- 2.000MΩ, 20.00MΩ: ±2.0% of rdg ±3 dgts
- Temperature:
- -50°C~+1000°C: ±3% of rdg ±5dgts
- -58°F~±1832°F: ±3% of rdg ±8dgts
- Diode Test: ±10% of rdg ±5 dgts.
Usage Features:
The MT22 features a rotary function switch for selecting measurement types (V DC, V AC, µA, mA, A, Ω, Diode/Continuity, Temperature).
- Mode Button: Used to select between Diode/Continuity, AC/DC, and Temperature (°C/°F) within a given function.
- Range Button: Allows switching between auto-ranging and manual ranging. In manual ranging, users can step through available ranges. Holding the button for 2 seconds returns to auto-ranging.
- Data Hold Button: Freezes the current reading on the display, indicated by "HOLD."
- Max Hold Button: Captures and continuously updates the maximum measured value.
- Test Lead Connections: Dedicated jacks for positive (V, Ω, Temp), common (COM), and high current (10A, µA/mA) inputs.
- Safety Precautions: The manual emphasizes critical safety information, including warnings against measuring voltages exceeding limits, working on live circuits without proper isolation, and exceeding current measurement durations. Specific warnings are provided for high-voltage circuits, AC/DC current measurements, and temperature measurements.
Maintenance Features:
- Battery Replacement: When the "BAT" indicator appears, the 9V battery needs to be replaced. The process involves disconnecting test leads, loosening a screw on the battery cover, inserting a new battery with correct polarity, and securing the cover.
- Fuse Replacement: For the 10A range, a 10A/250V fast blow fuse is used. The procedure is similar to battery replacement: disconnect test leads, loosen the fuse cover screw, remove the old fuse, install a new one of the proper size and value, and secure the cover.
- Troubleshooting: If the meter does not work properly, users are advised to check the fuses and battery for proper insertion and condition.
The MT22 is designed for safe and accurate electrical measurements, providing essential functions for electricians, technicians, and hobbyists. Its compact design and clear display make it a practical tool for various applications.
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