亨士樂(lè)計(jì)數(shù)器hengstler0465790直銷方案的確定  系統(tǒng)采用MCS—51系列單片機(jī)AT89S51作為控制核心，門控信號(hào)由AT89S51內(nèi)部的計(jì)數(shù)定時(shí)器產(chǎn)生，單位為1µs。由于單片機(jī)的計(jì)數(shù)頻率上限較低(12MHZ晶振時(shí)約500KHZ)，所以需對(duì)高頻被測(cè)信號(hào)進(jìn)行硬件分頻處理，AT89S51則完成運(yùn)算、控制及顯示功能。由于使用了單片機(jī)，使整個(gè)系統(tǒng)具有極為靈活的可編程性，能方便地對(duì)系統(tǒng)進(jìn)行功能擴(kuò)展與改進(jìn)。原理圖如圖2-2。

hengstler計(jì)數(shù)器    0465790    IMP.ZAE 230AC 4ST RT/RE
hengstler計(jì)數(shù)器    0465798    IMP.ZAE 100AC 4ST RT/RE
hengstler計(jì)數(shù)器    0465799    IMP.ZAE 200AC 4ST RT/RE
hengstler計(jì)數(shù)器    0466165    IMP.ZAE 24 VDC 6ST RO
hengstler計(jì)數(shù)器    0466170    IMP.ZAE 48DC 6ST RO
hengstler計(jì)數(shù)器    0466172    IMP.ZAE 60DC 6ST RO
hengstler計(jì)數(shù)器    0466175    IMP.ZAE 110DC 6ST RO
hengstler計(jì)數(shù)器    0466181    IMP.ZAE 220DC 6ST RO
hengstler計(jì)數(shù)器    0466186    IMP.ZAE 24AC 6ST RO
hengstler計(jì)數(shù)器    0466188    IMP.ZAE 42AC 6ST RO
hengstler計(jì)數(shù)器    0466189    IMP.ZAE 115 VAC 6ST RO
hengstler計(jì)數(shù)器    0466190    IMP.ZAE 230AC 6ST RO
hengstler計(jì)數(shù)器    0466601    IMP.ZAE 24DC 6ST RO NEUTRAL+DO+FR
hengstler計(jì)數(shù)器    0466605    IMP. ZAE 110/125DC 6ST RO -40°
hengstler計(jì)數(shù)器    0468161    IMP.ZAE  12 VDC 8ST RO
hengstler計(jì)數(shù)器    0468165    IMP.ZAE  24 VDC 8ST RO
hengstler計(jì)數(shù)器    0468170    IMP.ZAE  48DC 8ST RO
hengstler計(jì)數(shù)器    0468175    IMP.ZAE 110DC 8ST RO
hengstler計(jì)數(shù)器    0468181    IMP.ZAE 220DC 8ST RO
hengstler計(jì)數(shù)器    0468186    IMP.ZAE  24 VAC 8ST RO
hengstler計(jì)數(shù)器    0468189    IMP.ZAE 115 VAC 8ST RO
hengstler計(jì)數(shù)器    0468190    IMP.ZAE 230AC 8ST RO
hengstler計(jì)數(shù)器    0468603    IMP.ZAE 100AC 8ST RO+DO+FR
hengstler計(jì)數(shù)器    0468605    IMP.ZAE 200AC 8ST RO+DO+FR+VR
hengstler計(jì)數(shù)器    0468607    IMP.ZAE 110DC 8ST RO+DO+FR "KM"
hengstler計(jì)數(shù)器    0468609    IMP.ZAE  12 VDC 8ST (7ws1rt) neutral
hengstler計(jì)數(shù)器    0468611    IMP.ZAE  12 VDC 8ST RO NEUTRAL
hengstler計(jì)數(shù)器    0468612    IMP.ZAE 24VDC 8ST RO+DO+FR "KM"
hengstler計(jì)數(shù)器    0478103    ZEITZAE 115VAC/50 6ST RT
hengstler計(jì)數(shù)器    0478103SR    ZEITZAE 115VAC/50 6ST SR
hengstler計(jì)數(shù)器    0478104    ZEITZAE. 115VAC/60 6ST RT
hengstler計(jì)數(shù)器    0478105    ZEITZAE 230VAC/50 6ST RT
hengstler計(jì)數(shù)器    0478105SR    ZEITZAE 230VAC/50 6ST SR
hengstler計(jì)數(shù)器    0478106    ZEITZAE 220VAC/60 6ST RT

6位數(shù)顯頻率計(jì)數(shù)器
    亨士樂(lè)計(jì)數(shù)器hengstler0465790直銷3  2.2 方案的確定  系統(tǒng)采用MCS—51系列單片機(jī)AT89S51作為控制核心，門控信號(hào)由AT89S51內(nèi)部的計(jì)數(shù)定時(shí)器產(chǎn)生，單位為1µs。由于單片機(jī)的計(jì)數(shù)頻率上限較低(12MHZ晶振時(shí)約500KHZ)，所以需對(duì)高頻被測(cè)信號(hào)進(jìn)行硬件分頻處理，AT89S51則完成運(yùn)算、控制及顯示功能。由于使用了單片機(jī)，使整個(gè)系統(tǒng)具有極為靈活的可編程性，能方便地對(duì)系統(tǒng)進(jìn)行功能擴(kuò)展與改進(jìn)。原理圖如圖2-2。   

hengstler計(jì)數(shù)器    0478106SR    ZEITZAE 220VAC/60 6ST SR
hengstler計(jì)數(shù)器    0478113    ZEITZAE 115VAC/50 7ST RO
hengstler計(jì)數(shù)器    0478114    ZEITZAE 115VAC/60  7ST RO
hengstler計(jì)數(shù)器    0478115    ZEITZAE 230VAC/50 7ST RO
hengstler計(jì)數(shù)器    0478116    ZEITZAE 220VAC/60 7ST RO
hengstler計(jì)數(shù)器    0478121    ZEITZAE 24 VDC 6ST RT
hengstler計(jì)數(shù)器    0478121SR    ZEITZAE 24VDC  6ST SR
hengstler計(jì)數(shù)器    0478123    ZEITZAE 24 VDC 7ST RO
hengstler計(jì)數(shù)器    0478160    ZEITZAE 12 VDC 6ST RT
hengstler計(jì)數(shù)器    0486160    EINST.ZAE  12 VDC 5ST RT
hengstler計(jì)數(shù)器    0486164    EINST.ZAE  24 VDC 5ST RT
hengstler計(jì)數(shù)器    0486164SR    EINST.ZAE  24DC 5ST SR
hengstler計(jì)數(shù)器    0486168    INST.ZAE  48DC 5ST RT
hengstler計(jì)數(shù)器    0486174    EINST.ZAE 110DC 5ST RT
hengstler計(jì)數(shù)器    0486180    EINST.ZAE 220DC 5ST RT
hengstler計(jì)數(shù)器    0486186    EINST.ZAE  24AC 5ST RT
hengstler計(jì)數(shù)器    0486186SR    EINST.ZAE  24AC 5ST SR
hengstler計(jì)數(shù)器    0486188    EINST.ZAE  42AC 5ST
hengstler計(jì)數(shù)器    0486189    EINST.ZAE 115 VAC 5ST RT
hengstler計(jì)數(shù)器    0486190    EINST.ZAE 230AC 5ST RT
hengstler計(jì)數(shù)器    0486190SR    EINST.ZAE 230AC 5ST SR
hengstler計(jì)數(shù)器    0486198    EINST.ZAE 100AC 5ST RT
hengstler計(jì)數(shù)器    0486601    EINST.ZAE 5ST ZM24DC RM230AC SO
hengstler計(jì)數(shù)器    0486611    EINST.ZAE 200AC 5ST RT
hengstler計(jì)數(shù)器    0486618    EINST.ZAE  24 VDC 5ST RT SONDER
hengstler計(jì)數(shù)器    0486760    EINST.ZAE  12DC 5ST RT/RE RD
hengstler計(jì)數(shù)器    0486764    EINST.ZAE  24DC 5ST RT/RE
hengstler計(jì)數(shù)器    0486764SR    EINST.ZAE  24DC 5ST SR/RE
hengstler計(jì)數(shù)器    0486768    EINST.ZAE 48DC 5ST RT/RE
hengstler計(jì)數(shù)器    0486780    EINST.ZAE 220DC 5ST RT/RE
hengstler計(jì)數(shù)器    0486786    EINST.ZAE  24AC 5ST RT/RE
hengstler計(jì)數(shù)器    0486786SR    EINST.ZAE  24AC 5ST SR/RE
hengstler計(jì)數(shù)器    0486788    EINST.ZAE 42AC 5ST RT/RE
hengstler計(jì)數(shù)器    0486789    EINST.ZAE 115AC 5ST RT/RE

    圖2-2  單片機(jī)測(cè)頻原理圖    在本設(shè)計(jì)方案中，我通過(guò)程序設(shè)定T0工作在計(jì)數(shù)狀態(tài)下，T1工作在計(jì)時(shí)狀態(tài)下。T0計(jì)數(shù)器對(duì)輸入的信號(hào)經(jīng)行計(jì)數(shù)，其zui大計(jì)數(shù)值為fOSC/24,當(dāng)fOSC=12MHz時(shí)，T0的zui大計(jì)數(shù)頻率為500kHz。由于信號(hào)的頻率就是每秒鐘信號(hào)脈沖的個(gè)數(shù)，于是我讓T1工作在定時(shí)狀態(tài)下，定時(shí)時(shí)間為1秒。每定時(shí)1秒鐘到，就停止T0的計(jì)數(shù)，然后從T0的計(jì)數(shù)單元中讀取計(jì)數(shù)的數(shù)值，即完成了信號(hào)頻率的測(cè)量。zui后通過(guò)六位數(shù)碼管顯示出頻率值。 hengstler計(jì)數(shù)器    0486789SR    EINST.ZAE 115AC 5ST SR/RE
hengstler計(jì)數(shù)器    0486790    EINST.ZAE 230AC 5ST RT/RE
hengstler計(jì)數(shù)器    0486790SR    EINST.ZAE 230AC 5ST SR/RE
hengstler計(jì)數(shù)器    0486798    EINST.ZAE 100AC 5ST RT/RE
hengstler計(jì)數(shù)器    0487164    EINST.ZAE 24 VDC 3ST RT
hengstler計(jì)數(shù)器    0487164SR    EINST.ZAE  24DC 3ST SR
hengstler計(jì)數(shù)器    0487174    EINST.ZAE 110DC 3ST RT
hengstler計(jì)數(shù)器    0487186    EINST.ZAE 24AC 3ST RT
hengstler計(jì)數(shù)器    0487189    EINST.ZAE 115 VAC 3ST RT
hengstler計(jì)數(shù)器    0487190    EINST.ZAE 230AC 3ST RT
hengstler計(jì)數(shù)器    0487190SR    EINST.ZAE 230AC 3ST SR
hengstler計(jì)數(shù)器    0487198    EINST.ZAE 100AC 3ST RT
hengstler計(jì)數(shù)器    0487607    EINST.ZAE 200AC 3 RT M.VARISTOR
hengstler計(jì)數(shù)器    0487764    EINST.ZAE 24DC 3ST RT/RE
hengstler計(jì)數(shù)器    0487771    EINST.ZAE 60DC 3ST RT/RE
hengstler計(jì)數(shù)器    0487780SR    EINST.ZAE 220DC 3ST SR/RE
hengstler計(jì)數(shù)器    0487786    EINST.ZAE 24AC 3ST RT/RE
hengstler計(jì)數(shù)器    0487788    EINST.ZAE 42AC 3ST RT/RE
hengstler計(jì)數(shù)器    0487789    EINST.ZAE 115AC 3ST RT/RE
hengstler計(jì)數(shù)器    0487789SR    EINST.ZAE 115AC 3ST SR/RE
hengstler計(jì)數(shù)器    0487790    EINST.ZAE 230AC 3ST RT/RE
hengstler計(jì)數(shù)器    0487790SR    EINST.ZAE 230AC 3ST SR/RE
hengstler計(jì)數(shù)器    0487798    EINST.ZAE 100AC 3ST RT/RE
hengstler計(jì)數(shù)器    0487799    EINST.ZAE 200AC 3ST RT/RE
hengstler計(jì)數(shù)器    0489103    ZEITZAE 115/50 5ST RT
hengstler計(jì)數(shù)器    0489105    ZEITZAE 230/50 5ST RT
hengstler計(jì)數(shù)器    0489105SR    ZEITZAE 230/50 5ST SR
hengstler計(jì)數(shù)器    0489106    ZEITZAE 220/60 5ST RT
hengstler計(jì)數(shù)器    0489106SR    ZEITZAE 220/60 5ST SR
hengstler計(jì)數(shù)器    0489121    ZEITZAE  24DC 5ST RT
hengstler計(jì)數(shù)器    0489121SR    ZEITZAE  24DC  5ST SR
hengstler計(jì)數(shù)器    0489705    ZEITZAE 230/50 5ST RT/RE
hengstler計(jì)數(shù)器    0489705SR    ZEITZAE 230/50 5ST SR/RE
hengstler計(jì)數(shù)器    0490001     MAGNET ZAE N 6ST VERG.
hengstler計(jì)數(shù)器    0490002    MAGNET ZAE S 6ST VERG.
hengstler計(jì)數(shù)器    0490003    MAGNET ZAE E 6ST VERG.
hengstler計(jì)數(shù)器    0490004     MAGNET ZAE N 7ST VERG.
hengstler計(jì)數(shù)器    0490005    MAGNET ZAE S 7ST VERG.
hengstler計(jì)數(shù)器    0490006    MAGNET ZAE E 7ST VERG.
hengstler計(jì)數(shù)器    0490011    MAGNET ZAE N 6ST VERG. IP66
hengstler計(jì)數(shù)器    0490012     MAGNET ZAE N 7ST VERG.

由于要盡可能的使用zui少的元件，在滿足設(shè)計(jì)要求的前提下，我盡可能的減少了元器件的使用。將被測(cè)信號(hào)不加任何處理，直接輸入單片機(jī)的T0口。而將被測(cè)信號(hào)經(jīng)行放大整形、倍頻鎖相等處理就不再進(jìn)行了。這樣做會(huì)使該頻率計(jì)在測(cè)量信號(hào)頻率 時(shí)產(chǎn)生精度誤差，但能夠滿足設(shè)計(jì)要求。 電路原理圖見(jiàn)附錄Ⅰ