Maintenance of the motherboard commonly used multimeter which two stops
The use of digital multimeter repair motherboard, the main use of several gears, 1: diode gear: used to run the line, measuring the resistance to ground, measuring the line on and off, 2: resistor block is used to measure the resistance of the motherboard resistor, 3: DC 20V voltage block, because the highest voltage on the motherboard is only 12V Repair of the motherboard is mainly rely on the measurement of the resistance to ground, and the ground voltage value to determine the fault, with the measurement of the current is too little.
Generally speaking, the measurement of the circuit, in the case of the circuit is charged, to measure the DC voltage, so the gear should be placed in the DC voltage gear, as to the specific gear, depending on the circuit you measure the situation, measuring DC current is rare, because the measurement of the current should be disconnected from the circuit at a certain point to measure.
In the case of the circuit is not charged, the main measurement of the circuit of the DC resistance, the general multimeter gear on the ohm gear 1K gear measurement mostly, as for the measurement of which points, depending on your familiarity with the circuit and mastery.
What is the commonly used position of multimeter?
See what you do with the work, strong electricians often use AC power measurement gear (~) 250v, 1000v, current measurement gear. Home appliance repair with more gear resistance measurement, AC power measurement, DC power measurement, etc., repair the car with DC gear and resistance gear.
I said are roughly the meaning of the multimeter on the different gears are divided into regions, each region is divided into different values of the size of the gears.
Multimeter each gear is measured what the
Digital multimeter measuring gear: DC voltage (DCV), AC voltage (ACV), DC current (DCA), AC current (ACA), resistance (Ω), diode forward voltage drop (VF), transistor emitter current amplification factor (hrg), capacitance (C), conductivity (ns), temperature (T), frequency (f), to check the line through the buzzer file (BZ), low Power method of measuring resistance (L0Ω). Some instruments have inductance file, signal file, AC/DC automatic conversion, capacitance file automatic conversion range.
Most of the digital multimeter type added the following novel and practical test functions: readings hold (HOLD), logic test (LOGIC), true RMS (TRMS), relative value measurement (RELΔ), automatic shutdown (AUTO OFF POWER) and so on.
