Nên vạn năng cần hiệu chuẩn để đo điện trở và dịch chuyển bánh răng
The ohm range of a multimeter can measure the resistance of a conductor. The ohm range is represented by "Ω" and is divided into four levels: R × 1, R × 10, R × 100, and R × 1K. Some multimeters also have an R × 10k range. To measure resistance using a multimeter in the ohm range, in addition to the Yêu cầu Điều đó Nên Be Met Before Use, the Following Steps Should Also Be followed.
1. Place the selector switch in the R × 100 position, short-circuit the two probes to adjust the zero position knob of the ohm range, so that the pointer points to the zero position on the right end of the resistance scale line. If the pointer cannot be adjusted to zero, it indicates that the battery voltage in the meter is insufficient and the battery should be replaced.
2. Sử dụng hai đầu dò đến tương ứng chạm hai chân của đo đo điện trở cho đo lường. Chính xác đọc giá trị của điện trở nhọn bởi con trỏ , và sau đó nhân nó bởi nhân yếu tố (R % c3% 97 100 nên be nhân 100% 2c R c3% 97 1k nên be nhân bởi 1000...). Nó là điện trở điện trở giá trị của đo điện trở.
Đến đảm bảo chính xác đo lường, the pointer should be placed near the center of the scale line during gauing. If the pointer angle is small, switch to R × 1k gear. If the pointer angle is large, switch to R × 10 gear or R × 1 gear. After each gear shift, adjust the Ohm gear zero adjustment núm again before measureing.
Sau khi các đo lường là hoàn thành% 2c đầu dò nên được kéo ra và lựa chọn công tắc nên được đặt in % 22OFF% 22 vị trí hoặc tối đa AC điện áp vị trí. Đặt đi đồng hồ vạn năng.
The principle of measuring resistance with a multimeter is the single coil ohmmeter method. Due to the different resistance values connected to each resistance level, they increase tenfold, such as x 1, x 10, x 100, x 1000, x 10k. When the terminal is short circuited, the internal resistance inside the battery is connected in series with the internal resistance of the meter head and the resistance of level 1. When the battery voltage remains constant, the current flowing through the meter head coil corresponds exactly to the Ohmic zero position, that is, the terminal voltage of the meter head coil corresponding to the zero position is constant. If the resistance values of each gear are changed, the terminal voltage of the meter will change, causing the current flowing through the meter to also change accordingly, and the meter needle will no longer point to the zero ohm position. For example, when the resistance level is gradually changed from R × 1 to high, the voltage of the meter head also decreases gradually, the current decreases gradually, and the pointer deflection will not reach the zero ohm position, which will cause significant measurement errors. So it is necessary to adjust the zero knob to maintain the current of the meter coil constant, so that the pointer can point back to the zero position in ohms, to ensure the accuracy of measurement for each gear.
