Vim li cas lub multimeter nyeem 2400hz voltage tab sis qhov kev nyeem ntawv voltage ntawm cov zaub tsis raug?
Ua ntej tshaj plaws, peb yuav tsum nkag siab txog qhov txiaj ntsig zoo ntawm tus nqi ntsuas multimeter. Peb niaj hnub siv multimeters suav nrog pointer multimeters thiab digital multimeters. Pointer multimeters muaj AC voltage ntau ntawm 10v txog 1000v thiab qhov ntsuas qhov tsawg kawg nkaus ntawm 0.2v. Saib ntawm daim duab schematic, cov ntaub ntawv AC voltage yog ib qho yooj yim rectification Circuit Court tsim rau 50Hz (60Hz hauv Tebchaws Meskas thiab Nyiv) AC voltage test. Internal circuit muaj xws li rectifier diodes yam tsis xav txog cov yam ntxwv siab. Yog hais tias qhov ntsuas lub teeb liab zaus tshaj 1KHz, nws yuav tsis raug tso cai.
Sab hauv ntawm digital multimeter yog IC rau kev ntsuas. Nws tsis muaj txiaj ntsig ntau los tso tawm daim duab schematic. Cov yam ntxwv siab zaus ntawm cov ntaub ntawv AC voltage muaj feem xyuam nrog lub bandwidth ntawm IC's operational amplifier (OP) thiab IC's AD conversion rate. Yuav muaj ntau cov ntsiab lus los piav qhia qhov tsis sib xws, yog li cia peb hais nws tam sim no.
Yog tias peb xav kom raug kuaj cov teeb liab hauv 2.4KHz zaus band, peb yuav tsum siv lub suab millivolt meter. Cov cuab yeej no yog ib qho cuab yeej siv rau kev ntsuas suab. Nws siv los ua hom pointer, tab sis tam sim no nws yog digital.
Raws li cov kev cai rau multimeters stipulate:
1. Lub multimeter tsis tuaj yeem tsuas yog siv los ntsuas qhov tsis kam ntawm cov khoom yuav tsum ntsuas, tab sis kuj tseem tuaj yeem ntsuas qhov voltage AC thiab DC. Qee qhov multimeters tuaj yeem ntsuas qhov tseem ceeb ntawm cov transistors thiab lub peev xwm ntawm capacitors.
2. Cov ntaub ntawv DC tam sim no ntawm multimeter yog ntau hom DC voltmeter. Qhov hluav taws xob ntau tuaj yeem nthuav dav los ntawm kev sib txuas ntawm qhov hluav taws xob kaw hluav taws xob faib hluav taws xob sib txuas nrog lub taub hau 'meter'. Cov ntaub ntawv DC voltage ntawm multimeter yog ntau yam DC voltmeter. Txuas lub voltage faib resistor nyob rau hauv series nrog lub 'meter' lub taub hau yuav nthuav nws voltage ntau yam.
3. Qhov sib txawv voltage faib cov resistors ntawm lub multimeter muaj qhov sib txawv sib txawv. Lub taub hau ntawm lub multimeter yog ib qho kev ntsuas magnetoelectric system, uas tsuas tuaj yeem dhau los ntawm qhov ncaj qha tam sim no, thiab siv cov diodes hloov pauv mus rau qhov tam sim no ncaj qha, yog li paub txog qhov ntsuas ntawm kev hloov tam sim no.
