주의 사항 구매 a 단어 멀티 미터
시작 시작 하나's 실제 필요
The classification of digital multimeter is very complex: according to its structure, it can be divided into desktop digital multimeter and handheld digital multimeter. According to whether it has a microprocessor, it can be divided into traditional A/D conversion digital multimeter and intelligent digital multimeter. According to its digits, it can also be divided into 3 and a half digital multimeter, 4 and a half digital multimeter, etc.
The accuracy, structure, brand, and intelligence of digital multimeters determine price differences. 현재, the price range of digital multimeters sold in the market ranges from tens of thousands of yuan to tens of thousands of yuan. Therefore, before choosing a product, it is important to clarify your own needs when buying a digital multimeter. If it is only a general test and does not require high measurement accuracy, then choosing a cheap handheld digital multimeter is sufficient; If you are engaged in precision measurement, repair, or have high requirements for the stability of measurement data, you should choose high-end handheld digital multimeter or desktop digital multimeter.
주의사항 언제 구매
A. 정확도
그만큼 정확도 의 a 디지털 멀티미터 직접 영향 그의 정확도 의 측정 결과. To 획득 a 디지털 멀티미터, 하나 해야 함 처음 분석 그것 정확도 기술 지표: first, check 여부 the accuracy of the meter can meet their own requirements; second, analyze the overall performance of the meter. Do not assume that a 4-digit digital multimeter is necessarily higher than a 3-and-a-half digit multimeter in terms of measurement accuracy, A rough craftsmanship 4 and a half digit multimeter may have a measurement accuracy that is not as good as a well crafted 3 and a half digit multimeter. The shop owner has encountered such a meter: a DT9103 type 4 and a half digit multimeter generated by an unknown small factory, during the measurement process, the number jumping is very severe, and it cannot meet the technical requirements at all.
B. 주의 사항
1. 모양
A good digital multimeter can become a delightful handicraft, whether it is made of materials, injection molding technology, circuit boards, protective sleeves or other components, it should be as perfect as possible.
2. 검사 항목
후 수신 a 디지털 멀티미터:
첫째로, it is necessary to check whether the watch case is intact, whether the switches and buttons are functioning properly, and whether the touch is good.
Check 여부 the toggle switch (측정 기능 선택) 회전 유연하게, has appropriate damping, and feels comfort, and whether the corresponding measurement function is normal.
Check whether the LCD screen is clear, whether there are missing strokes, and whether the number jumping should be as small as possible.
Can the 부저 소리.
3. 참조 요인
만약 당신 할 수 있다 열다 the watch case, 당신 할 수 있다 지불 주의 to the design of the circuit board, the selected components, installation and welding level, etc. A good digital multimeter, the design of the circuit board is very important. 국내 시계 보통 have a double-layer board, while some large foreign factories choose a multi-layer circuit board layout to provide better shielding and electrical performance. 레벨 의 구성 요소 선택 결정 그의 측정 정확도 의 디지털 멀티미터. 높은 끝 디지털 멀티미터 자주 사용 칩 장착된 구성 요소 to 개선 정확도 동안 감소 크기 의 회로 보드. 구성 요소 in key areas may even be screened. I won't talk much about welding skills, as electronics enthusiasts know (when it comes to welding skills, you can open a digital multimeter worth more than ten yuan to take a look, and the products from the manual workshop are guaranteed to make you feel miserable).
언제 구매, 당신 해야 함 또한 지불 주의 to some details, such as safety protection, product warranty, testing cables, user manuals, etc., to ensure they are complete.
4. 성능 테스트
언제 구매 a 디지털 멀티미터, the 측정 기능 of the 디지털 멀티미터 할 수 있음 be 확인 by 측정 알려진 수량 (예: as 저항, 커패시턴스, 배터리 전압, AC 전압, 등). 만약 조건 허가, 그것 할 수 있다 be 보냄 to the 대응 조직 for 항목화 검사 및 수락 의 기술 지표.
