멀티 미터 - 측정 저항 방법 및 주의사항
전통적 및 디지털 멀티미터 는 두 유형 의 멀티미터. 그의 정렬 의 멀티미터 사용 전통적으로 is called an 전자기 편향 포인터. Each use requires a mechanical zero adjustment. The use is laborious, and the indicator reading is arbitrary and vague. The digital multimeter, on the other hand, can display the number directly without needing to look at the scale to read it, provides a more accurate result, and is already in widespread usage입니다.
방법 to use a 멀티미터 to measure resistance
1. 단락 둘 테스트 리드, 스위치 선택자 스위치 to the 고배율 기어, and turn the ohm gear's zero adjustment knob until the needle is at the zero position at the right end of the resistance scale. If the pointer cannot be set to zero, the watch's battery's voltage is insufficient, and a new battery needs to be purchased.
2. To measure the resistance under test, touch each of the two pins with a pair of test leads. To obtain the resistance value of the measured resistance, correct read the value of the resistance pointed by the pointed by the pointer and then multiply it by the magnification.
3. 언제 복용 the 측정, the pointer should be roughly in the middle of the scale line. 당신 해야 함 이동 to a 저배율 기어 만약 the 포인터 편향 각도 is 겸손, and to a 고배율 기어 만약 the 포인터 편향 각도 is 상당한. The ohm gear's zero adjustment knob needs to be adjusted once more and then measured after each gear shift.
4. After the measurement is finished, remove the test leads and switch the selector to the "OFF" or highest AC voltage position. Put the multimeter aside.
언제 결정 저항, take note of:
1. Prior to measurement, the measured resistance needs to be taken out of the circuit.
2. 회피 접촉 둘 테스트 리드 하나 후 그의 기타 for a while.
3. 둘 다 아님 둘 핀 의 측정된 저항 nor the 금속 막대 의 둘 테스트 리드 할 수 있음 be touched by two hands at the same time. It is preferable to use your right hand to grip both test leads 동시에.
4. The battery in the meter needs to be removed if the ohm gear is not used for an extended period of time.
Steps for using a multimeter to measure resistance
Step 1: Set the resistance gear with the gear knob;
Step 2: Short-circuit the multimeter's two nibs, then check to see if the pointer is pointing to zero (far right). Return it to zero mechanically if it does not point at the zero position;
Step 3: Join the resistor's two ends to the two test leads of the multimeter;
Step 4: Pay attention to the multimeter's reading (notice that, unlike current and voltage measurements, resistance measurements start on the right), then add the reading to the resistance range to obtain the final resistance value.
(1) To achieve a more accurate reading, choose an appropriate magnification device and position the pointer as close to the scale's center as feasible. When measuring, the resistance value of the measured resistance is calculated by multiplying the indicated value of the pointer on the scale by the magnification.
(2) The two test leads should be short-circuited before measuring the resistance or after changing magnification gears, and the zero adjustment knob should be utilized for zero adjustment. Battery replacement is necessary if the zero adjustment is not feasible. To avoid short-circuiting of the test leads and resulting short-circuit discharge of the battery, the transfer switch should be turned to the the greatest level of AC voltage or to the 중립 위치 한 번 측정 이다 완료. In addition, it preevents burning the meter head and preventing forgetting to change gears to measure the voltage in the subsequent measurement.
(3) Measure the resistance without the power on to avoid getting an inaccurate reading and possible damage to the meter head.
(4) To prevent damage to semiconductor components, use R*100 gear rather than high resistance gear when using a multimeter to measure the positive and negative resistance of semiconductor components.
(5) It is totally prohibited to measure the internal resistance of microammeters, galvanometers, standard batteries, and other instruments and meters using the resistance gear of a multimeter.
