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Summary of Contents for Mastech M839b
- Page 1 POCKET-SIZED DIGITAL MULTIMETER OPERATOR’S INSTRUCTION MANUAL...
- Page 3 SAFETY INFORMATION The meter has been designed according to IEC1010 concerning electronic measuring instruments with an overvoltage category (CATII) and pollution 2. Follow all safety and operating instructions to ensure the meter is used safely and is kept in good condition. Full compliance with safety standards can be guaranteed only with test leads supplied.
- Page 4 • Never use the meter unless the back cover is in place and fastened completely. • Do not use abrasives or solvents on the meter. To clean it using only a damp cloth and mild detergent. FRONT PANEL DESCRIPTION Rotary Switch This switch is used to select the function and desired ranges as well as to turn on/off the meter.
- Page 5 DC CURRENT Range Resolution Accuracy ±1.0% of rdg ± 2 digits 200μA 0.1μA ±1.0% of rdg ± 2 digits 2000μA 1μA ±1.0% of rdg ± 2 digits 20mA 0.01mA ±1.5% of rdg ± 2 digits 200mA 0.1mA ±3.0% of rdg ± 2 digits 10mA Overload protection: F250mA 250V fuse (10A range unfused).
- Page 6 OPERATING INSTRUCTIONS AC VOLTAGE MEASUREMENT 1. Connect the red test lead to “VΩmA” jack and the black lead to the “COM” jack. 2. Set the rotary switch at desired V~ position. 3. Connect test leads across the source or load being measured and read voltage value on the LCD display.
- Page 7 2. Determine whether the transistor under testing is NPN or PNP type and locate the emitter, base and collector leads. Insert the leads into proper holes of the hFE socket on the front panel. 3. The meter will show the approximate hFE value at the condition of base current 10μA and Vce 3V.
- Page 8 CAUTION: Using this appliance in an environment with a strong radiated radio-frequency electromagnetic field (approximately 3V/m), may influence its measuring accuracy. The measuring result can be strongly deviating from the actual value. HYS004369...
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