You need to determine whether or not the circuit is AC or DC by measuring the voltage of the circuit as described in previous steps. If the circuit to be tested is AC but the meter will only measure DC amps (or vice versa), stop. The meter must be able to measure the same mode (AC or DC) amps as the voltage in the circuit, otherwise it will indicate 0.  Be aware that most multimeters will only measure extremely small amounts of current, in the uA and mA ranges. 1 uA is .000001 amp and 1 mA is .001 amp. These are values of current that flow only in the most delicate electronic circuits, and are literally thousands (and even millions) of times smaller than values seen in the home and automotive circuits that most homeowners would be interested testing. Just for reference, a typical 100W/120V light bulb will draw .833 Amps. This amount of current would likely damage the meter beyond repair. Ideal for the homeowner, this meter were to be used to measure current through a 4700 ohm resistor across 9 Volts DC.  To do this, insert the black probe into the "COM" or "-" jack and insert the red probe into the "A" jack. Shut off power to the circuit. Open the portion of the circuit that is to be tested (one lead or the other of the resistor). Insert the meter in series with the circuit such that it completes the circuit. An ammeter is placed in series with the circuit to measure current. It cannot be placed "across" the circuit the way a voltmeter is used (otherwise the meter will probably be damaged). Observe the polarity. Current flows from the positive side to the negative side. Set the range of current to the highest value. Apply power and adjust range of meter downward to allow accurate reading of pointer on the dial. Do not exceed the range of the meter, otherwise it may be damaged.   reading of about 2 milliamps should be indicated since from Ohm's law I = V/R = (9 volts)/(4700 Ω) = .00191 amps = 1.91 mA. Even if the operating current is low and within the range of the meter fuse, the surge can be many times higher than the operating current, because the empty filter capacitors are almost like a short circuit. Blowing the meter fuse is almost certain if the DUT's (device under test) inrush current is many times higher than the fuses rating. In any case, always use the higher range measurement protected by the higher fuse rating and be careful.
احرص على قياس فرق الجهد أولًا. اضبط المقياس على أعلى مجال تيار متردد أو تيار مستمر مدعوم. فكّر في استخدام مقياس بمشبك. احذر من مكثفات الترشيح أو المكونات الأخرى التي تحتاج تدفقًا للتيار عند تشغيلها.