描述
8520-MOP7
變頻器輸出基波及諧波等測(cè)試均基于傅里葉變換,保證傅里葉變換精度的一個(gè)主要條件就是整周期截?cái)?,也就是說(shuō),參與傅里葉變換的數(shù)據(jù)應(yīng)該是整數(shù)個(gè)信號(hào)周期對(duì)應(yīng)的數(shù)據(jù)。目前市面上大部分測(cè)量?jī)x器做不到這一點(diǎn),其后果是測(cè)量數(shù)據(jù)波動(dòng)大,測(cè)量精度無(wú)法保障。另外,由于變頻器輸出諧波頻率較高,被測(cè)信號(hào)帶寬較寬,根據(jù)采樣定理,要求采樣頻率高于信號(hào)帶寬的兩倍。若信號(hào)帶寬為50kHz,采樣頻率必須高于100kHz。假設(shè)基波頻率為1Hz,這樣,在整周期截?cái)嗟囊笙?,至少分?S(一個(gè)信號(hào)周期)的數(shù)據(jù),而1S的數(shù)據(jù)量為100k點(diǎn),即傅里葉變換的點(diǎn)數(shù)為100k點(diǎn)。一般測(cè)量?jī)x器的處理器無(wú)法處理這么大量的數(shù)據(jù),運(yùn)算速度也跟不上,因此,實(shí)際測(cè)量中往往通過(guò)降低采樣頻率來(lái)減少傅里葉變換點(diǎn)數(shù),而降低采樣頻率之后,為了不違背采樣定理,只能在被測(cè)信號(hào)輸入側(cè)加抗混疊濾波器,這樣一來(lái),傅里葉變換可以正常進(jìn)行,基波可以準(zhǔn)確獲取,但是,被測(cè)信號(hào)的高次諧波被抑制了,不能滿足變頻器輸出諧波測(cè)量的需要。
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢(shì)價(jià)格,大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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專(zhuān)業(yè)銷(xiāo)售進(jìn)口DCS? PLC系統(tǒng)備件模塊
PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
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