山西省批發(fā)shinhwa optron繼電器SDP-2102DS,2A,75~250VACPARKER派克18RAOPNCSFS8MMVESP
PARKER派克18RISFS8MMVESP
PARKER派克18RISFS8MM3.25
PARKER派克18RISFS8MM
PARKER派克18RAOPNCSFS6MMVESP
PARKER派克18RISTS6MMVESP
PARKER派克18RISTS6MM3.25
PARKER派克18RISTS6MM
PARKER派克18RAOPNCSTS8MMVESP
PARKER派克18RISTS8MMVESP
PARKER派克18RISTS8MM3.25
PARKER派克18RISTS8MM
PARKER派克18RAOPNCSFS8FFVESP
PARKER派克18RISFS8FFVESP
PARKER派克18RISFS8FF3.25
PARKER派克18RISFS8FF
PARKER派克18RAOPNCSFS6FFVESP
PARKER派克18RISTS6FFVESP
PARKER派克18RISTS6FF3.25
PARKER派克18RISTS6FF
PARKER派克18RAOPNCSTS8FFVESP
PARKER派克18RISTS8FFVESP
PARKER派克18RISTS8FF3.25
PARKER派克18RISTS8FF
PARKER派克17RAOPNCSFS8MMVESP
PARKER派克17RISFS8MMVESP
PARKER派克17RISFS8MM3.25
PARKER派克17RISFS8MM
PARKER派克17RAOPNCSTS8MMVESP
PARKER派克17RISTS8MMVESP
PARKER派克17RISTS8MM3.25
PARKER派克17RISTS8MM
PARKER派克17RAOPNCSFS8FFVESP
PARKER派克17RISFS8FFVESP
PARKER派克17RISFS8FF3.25
PARKER派克17RISFS8FF
PARKER派克17RAOPNCSTS8FFVESP
PARKER派克17RISTS8FFVESP
PARKER派克17RISTS8FF3.25
PARKER派克17RISTS8FF
PARKER派克氣缸GDC100-25 1/2
PARKER派克氣缸GDC100-50 1/2
PARKER派克氣缸GDC100-75 1/2
PARKER派克氣缸GDC100-100 1/2
PARKER派克氣缸GDC100-125 1/2
PARKER派克氣缸GDC100-150 1/2
PARKER派克氣缸GDC100-200 1/2
PARKER派克氣缸GDC100-250 1/2
PARKER派克氣缸GDC100-300 1/2
PARKER派克氣缸GDC100-350 1/2
PARKER派克氣缸GDC100-400 1/2
PARKER派克氣缸GDC100-450 1/2
PARKER派克氣缸GDC100-500 1/2
PARKER派克氣缸GDC100-550 1/2
PARKER派克氣缸GDC100-600 1/2
PARKER派克氣缸GDC100-650 1/2
PARKER派克氣缸GDC100-700 1/2
PARKER派克氣缸GDC100-750 1/2
PARKER派克氣缸GDC100-800 1/2
PARKER派克氣缸GDC100-850 1/2
PARKER派克氣缸GDC100-900 1/2
PARKER派克氣缸GDC100-950 1/2
PARKER派克氣缸GDC100-1000 1/2
PARKER派克氣缸GDC80-25 1/2
PARKER派克氣缸GDC80-50 1/2
PARKER派克氣缸GDC80-75 1/2
PARKER派克氣缸GDC80-100 1/2
PARKER派克氣缸GDC80-125 1/2
PARKER派克氣缸GDC80-150 1/2
PARKER派克氣缸GDC80-200 1/2
PARKER派克氣缸GDC80-250 1/2
PARKER派克氣缸GDC80-300 1/2
PARKER派克氣缸GDC80-350 1/2
PARKER派克氣缸GDC80-400 1/2
PARKER派克氣缸GDC80-450 1/2
PARKER派克氣缸GDC80-500 1/2
PARKER派克氣缸GDC80-550 1/2
PARKER派克氣缸GDC80-600 1/2
PARKER派克氣缸GDC80-650 1/2
PARKER派克氣缸GDC80-700 1/2
PARKER派克氣缸GDC80-750 1/2
PARKER派克氣缸GDC80-800 1/2
PARKER派克氣缸GDC80-850 1/2
PARKER派克氣缸GDC80-900 1/2
PARKER派克氣缸GDC80-950 1/2
PARKER派克氣缸GDC80-1000 1/2
PARKER派克氣缸GDC50-25 3/8
PARKER派克氣缸GDC50-50 3/8
PARKER派克氣缸GDC50-75 3/8
PARKER派克氣缸GDC50-100 3/8
PARKER派克氣缸GDC50-125 3/8
PARKER派克氣缸GDC125-25 1/2
PARKER派克氣缸GDC125-50 1/2
PARKER派克氣缸GDC125-75 1/2
PARKER派克氣缸GDC125-100 1/2
PARKER派克氣缸GDC125-125 1/2
PARKER派克氣缸GDC125-150 1/2
PARKER派克氣缸GDC125-200 1/2
PARKER派克氣缸GDC125-250 1/2
PARKER派克氣缸GDC125-300 1/2
PARKER派克氣缸GDC125-350 1/2
PARKER派克氣缸GDC125-400 1/2
PARKER派克氣缸GDC125-450 1/2
PARKER派克氣缸GDC125-500 1/2
PARKER派克氣缸GDC125-550 1/2
PARKER派克氣缸GDC125-600 1/2
PARKER派克氣缸GDC125-650 1/2
PARKER派克氣缸GDC125-700 1/2
PARKER派克氣缸GDC125-750 1/2
PARKER派克氣缸GDC125-800 1/2
PARKER派克氣缸GDC125-850 1/2
PARKER派克氣缸GDC125-900 1/2
PARKER派克氣缸GDC125-950 1/2
PARKER派克氣缸GDC125-1000 1/2
PARKER派克氣缸GDC50-150 3/8
PARKER派克氣缸GDC50-200 3/8
PARKER派克氣缸GDC50-250 3/8
PARKER派克氣缸GDC50-300 3/8例如個人電腦，而開關(guān)電源就進(jìn)行兩者之間電壓及電流的轉(zhuǎn)換。開關(guān)電源不同于線性電源，開關(guān)電源利用的切換晶體管多半是在全開模式（飽和區(qū)）及全閉模式（截止區(qū)）之間切換，這兩個模式都有低耗散的特點(diǎn)，切換之間的轉(zhuǎn)換會有較高的耗散，但時間很短，因此比較節(jié)省能源，產(chǎn)生廢熱較少。理想上，開關(guān)電源本身是不會消耗電能的。電壓穩(wěn)壓是透過調(diào)整晶體管導(dǎo)通及斷路的時間來達(dá)到。相反的，線性電源在產(chǎn)生輸出電壓的過程中，晶體管工作在放大區(qū)，本身也會消耗電能。開關(guān)電源的高轉(zhuǎn)換效率是其一大優(yōu)點(diǎn)，而且因為開關(guān)電源工作頻率高，可以使用小尺寸、輕重量的變壓器，因此開關(guān)電源也會比線性電源的尺寸要小，重量也會比較輕。若電源的高效率、體積及重量是考慮重點(diǎn)時。
PARKER派克氣缸GDC50-350 3/8
PARKER派克氣缸GDC50-400 3/8
PARKER派克氣缸GDC50-450 3/8
PARKER派克氣缸GDC50-500 3/8
PARKER派克氣缸GDC50-550 3/8
PARKER派克氣缸GDC50-600 3/8
PARKER派克氣缸GDC50-650 3/8
PARKER派克氣缸GDC50-700 3/8
PARKER派克氣缸GDC50-750 3/8
PARKER派克氣缸GDC50-800 3/8
PARKER派克氣缸GDC50-850 3/8
PARKER派克氣缸GDC50-900 3/8
PARKER派克氣缸GDC50-950 3/8
PARKER派克氣缸GDC50-1000 3/8
PARKER派克氣缸GDC40-25 1/4
PARKER派克氣缸GDC40-50 1/4
PARKER派克氣缸GDC40-75 1/4
PARKER派克氣缸GDC40-100 1/4
PARKER派克氣缸GDC40-125 1/4
PARKER派克氣缸GDC40-150 1/4
PARKER派克氣缸GDC40-200 1/4
PARKER派克氣缸GDC40-250 1/4
PARKER派克氣缸GDC40-300 1/4
PARKER派克氣缸GDC40-350 1/4
PARKER派克氣缸GDC40-400 1/4
PARKER派克氣缸GDC40-450 1/4
PARKER派克氣缸GDC40-500 1/4
PARKER派克氣缸GDC40-550 1/4
PARKER派克氣缸GDC40-600 1/4
PARKER派克氣缸GDC40-650 1/4
PARKER派克氣缸GDC40-700 1/4
PARKER派克氣缸GDC40-750 1/4
PARKER派克氣缸GDC40-800 1/4
PARKER派克氣缸GDC40-850 1/4
PARKER派克氣缸GDC40-900 1/4
PARKER派克氣缸GDC40-950 1/4
PARKER派克氣缸GDC40-1000 1/4
PARKER派克氣缸GDC150-25 1/2
PARKER派克氣缸GDC150-50 1/2
PARKER派克氣缸GDC150-75 1/2
PARKER派克氣缸GDC150-100 1/2
PARKER派克氣缸GDC150-125 1/2
PARKER派克氣缸GDC150-150 1/2
PARKER派克氣缸GDC150-200 1/2
PARKER派克氣缸GDC150-250 1/2
PARKER派克氣缸GDC150-300 1/2
PARKER派克氣缸GDC150-350 1/2
PARKER派克氣缸GDC150-400 1/2
PARKER派克氣缸GDC150-450 1/2
PARKER派克氣缸GDC150-500 1/2
PARKER派克氣缸GDC150-550 1/2
PARKER派克氣缸GDC150-600 1/2
PARKER派克氣缸GDC150-650 1/2
PARKER派克氣缸GDC150-700 1/2
PARKER派克氣缸GDC150-750 1/2
PARKER派克氣缸GDC150-800 1/2
PARKER派克氣缸GDC150-850 1/2
PARKER派克氣缸GDC150-900 1/2
PARKER派克氣缸GDC150-950 1/2
PARKER派克氣缸GDC150-1000 1/2
PARKER派克氣缸PK1A20-25 1/8
PARKER派克氣缸PK1A20-50 1/8
PARKER派克氣缸PK1A20-75 1/8
PARKER派克氣缸PK1A20-100 1/8
PARKER派克氣缸PK1A20-125 1/8
PARKER派克氣缸PK1A20-150 1/8
PARKER派克氣缸PK1A20-175 1/8
PARKER派克氣缸PK1A20-200 1/8
PARKER派克氣缸PK1A20-250 1/8
PARKER派克氣缸PK1A20-300 1/8
PARKER派克氣缸PK1A20-350 1/8
PARKER派克氣缸PK1A20-400 1/8
PARKER派克氣缸PK1A20-450 1/8
PARKER派克氣缸PK1A20-500 1/8
PARKER派克氣缸PK1A20-550 1/8
PARKER派克氣缸PK1A20-600 1/8
PARKER派克氣缸PK1A20-650 1/8
PARKER派克氣缸PK1A20-700 1/8
PARKER派克氣缸PK1A25-25 1/8
PARKER派克氣缸PK1A25-50 1/8
PARKER派克氣缸PK1A25-75 1/8
PARKER派克氣缸PK1A25-100 1/8
PARKER派克氣缸PK1A25-125 1/8
PARKER派克氣缸PK1A25-150 1/8
PARKER派克氣缸PK1A25-175 1/8
PARKER派克氣缸PK1A25-200 1/8
PARKER派克氣缸PK1A25-250 1/8
PARKER派克氣缸PK1A25-300 1/8
PARKER派克氣缸PK1A25-350 1/8
PARKER派克氣缸PK1A25-400 1/8
PARKER派克氣缸PK1A25-450 1/8
PARKER派克氣缸PK1A25-500 1/8
PARKER派克氣缸PK1A25-550 1/8
PARKER派克氣缸PK1A25-600 1/8
PARKER派克氣缸PK1A25-650 1/8
PARKER派克氣缸PK1A25-700 1/8
PARKER派克氣缸PK1A40-25 1/4
PARKER派克氣缸PK1A40-50 1/4
PARKER派克氣缸PK1A40-75 1/4
PARKER派克氣缸PK1A40-100 1/4
PARKER派克氣缸PK1A40-125 1/4
PARKER派克氣缸PK1A40-150 1/4
PARKER派克氣缸PK1A40-175 1/4
PARKER派克氣缸PK1A40-200 1/4
PARKER派克氣缸PK1A40-250 1/4
PARKER派克氣缸PK1A40-300 1/4
PARKER派克氣缸PK1A40-350 1/4
PARKER派克氣缸PK1A40-400 1/4
PARKER派克氣缸PK1A40-450 1/4
PARKER派克氣缸PK1A40-500 1/4
PARKER派克氣缸PK1A40-550 1/4
PARKER派克氣缸PK1A40-600 1/4
PARKER派克氣缸PK1A40-650 1/4
PARKER派克氣缸PK1A40-700 1/4
PARKER派克氣缸PDC6-5 M5
PARKER派克氣缸PDC6-10 M5
PARKER派克氣缸PDC6-15 M5
PARKER派克氣缸PDC6-20 M5
PARKER派克氣缸PDC6-25 M5
PARKER派克氣缸PDC6-30 M5
PARKER派克氣缸PDC6-35 M5
PARKER派克氣缸PDC6-40 M5
PARKER派克氣缸PDC6-45 M5
PARKER派克氣缸PDC6-50 M5
PARKER派克氣缸PDC6-60 M5
PARKER派克氣缸PDC6-70 M5
PARKER派克氣缸PDC6-75 M5
PARKER派克氣缸PDC6-100 M5
PARKER派克氣缸PDC10-5 M5
PARKER派克氣缸PDC10-10 M5
PARKER派克氣缸PDC10-15 M5
PARKER派克氣缸PDC10-20 M5
PARKER派克氣缸PDC10-25 M5
PARKER派克氣缸PDC10-30 M5
PARKER派克氣缸PDC10-35 M5
PARKER派克氣缸PDC10-40 M5
PARKER派克氣缸PDC10-45 M5
PARKER派克氣缸PDC10-50 M5
PARKER派克氣缸PDC10-60 M5
PARKER派克氣缸PDC10-65 M5
PARKER派克氣缸PDC10-70 M5
PARKER派克氣缸PDC10-75 M5
PARKER派克氣缸PDC10-100 M5
PARKER派克氣缸PDC10-125 M5
PARKER派克氣缸PDC10-150 M5
PARKER派克氣缸PDC16-5 M5
PARKER派克氣缸PDC16-10 M5
PARKER派克氣缸PDC16-15 M5
PARKER派克氣缸PDC16-20 M5
PARKER派克氣缸PDC16-25 M5
PARKER派克氣缸PDC16-30 M5
PARKER派克氣缸PDC16-35 M5
PARKER派克氣缸PDC16-40 M5
PARKER派克氣缸PDC16-45 M5
PARKER派克氣缸PDC16-50 M5
PARKER派克氣缸PDC16-60 M52.差動保護(hù)電流互感器，3.接地保護(hù)電流互感器（零序電流互感器）保護(hù)用電流互感器主要與繼電裝置配合，在線路發(fā)生短路過載等故障時，向繼電裝置提供信號切斷故障電路，以保護(hù)供電系統(tǒng)的。保護(hù)用電流互感器的工作條件與測量用電流保護(hù)用電流互感器保護(hù)用電流互感器互感器完全不同，保護(hù)用互感器只是在比正常電流大幾倍幾十倍的電流時才開始有效的工作。保護(hù)用互感器主要要求：1.絕緣可靠，2.足夠大的準(zhǔn)確限值系數(shù)，3.足夠的熱穩(wěn)定性和動穩(wěn)定性。保護(hù)用互感器在額定負(fù)荷下能夠滿足準(zhǔn)確級的要求一次電流叫額定準(zhǔn)確限值一次電流。準(zhǔn)確限值系數(shù)就是額定準(zhǔn)確限值一次電流與額定一次電流比。當(dāng)一次電流足夠大時鐵芯就會飽和起不到反映一次電流的作用。
PARKER派克氣缸PDC16-65 M5
PARKER派克氣缸PDC16-70 M5
PARKER派克氣缸PDC16-75 M5
PARKER派克氣缸PDC16-100 M5
PARKER派克氣缸PDC16-125 M5
PARKER派克氣缸PDC16-150 M5
PARKER派克氣缸PDC16-175 M5
PARKER派克氣缸PDC16-200 M5
PARKER派克氣缸GDCTDM100-50
PARKER派克氣缸GDCTDM100-75
PARKER派克氣缸GDCTDM100-100
PARKER派克氣缸GDCTDM100-150
PARKER派克氣缸GDCTDM100-200
PARKER派克氣缸GDCTDM100-250
PARKER派克氣缸GDCTDM100-300
PARKER派克氣缸GDCTDM100-350
PARKER派克氣缸GDCTDM100-400
PARKER派克氣缸GDCTDM100-450
PARKER派克氣缸GDCTDM100-500
PARKER派克氣缸GDCTSM100-50
PARKER派克氣缸GDCTSM100-75
PARKER派克氣缸GDCTSM100-100
PARKER派克氣缸GDCTSM100-150
PARKER派克氣缸GDCTSM100-200
PARKER派克氣缸GDCTSM100-250
PARKER派克氣缸GDCTSM100-300
PARKER派克氣缸GDCTSM100-350
PARKER派克氣缸GDCTSM100-400
PARKER派克氣缸GDCTSM100-450
PARKER派克氣缸GDCTSM100-500
PARKER派克氣缸GDCTM100-50
PARKER派克氣缸GDCTM100-75
PARKER派克氣缸GDCTM100-100
PARKER派克氣缸GDCTM100-150
PARKER派克氣缸GDCTM100-200
PARKER派克氣缸GDCTM100-250
PARKER派克氣缸GDCTM100-300
PARKER派克氣缸GDCTM100-350
PARKER派克氣缸GDCTM100-400
PARKER派克氣缸GDCTM100-450
PARKER派克氣缸GDCTM100-500
PARKER派克調(diào)壓閥PAR100-M5-B-C M5
PARKER派克調(diào)壓閥PAR200-02-C 1/4
PARKER派克調(diào)壓閥PAR302-03 3/8
PARKER派克調(diào)壓閥PAR403-04 1/2
PARKER派克調(diào)壓閥AL200-8 1/4
PARKER派克調(diào)壓閥AL320-10 3/8
PARKER派克調(diào)壓閥AL420-15 1/2
PARKER派克調(diào)壓閥AFR200-8 1/4
PARKER派克調(diào)壓閥AFR200-08-AD20 1/4
PARKER派克調(diào)壓閥AFR320-10 3/8
PARKER派克調(diào)壓閥AFR320-10-AD41 3/8
PARKER派克調(diào)壓閥AFR420-15 1/2
PARKER派克調(diào)壓閥AFR420-15-AD41 1/2
PARKER派克調(diào)壓閥AF200-8 1/4
PARKER派克調(diào)壓閥AF200-8-AD20 1/4
PARKER派克調(diào)壓閥AF320-10 3/8
PARKER派克調(diào)壓閥AF320-10-AD41 3/8
PARKER派克調(diào)壓閥AF420-15 1/2
PARKER派克調(diào)壓閥AF420-15-AD41 1/2
PARKER派克調(diào)壓閥AR200-8 1/4
PARKER派克調(diào)壓閥AR320-10 3/8
PARKER派克調(diào)壓閥AR420-15 1/2
PARKER派克調(diào)壓閥PCA200-02-B 1/4
PARKER派克調(diào)壓閥PCA302-03 3/8
PARKER派克調(diào)壓閥PCB302-03 3/8
PARKER派克調(diào)壓閥PCB302-03-D 3/8
PARKER派克調(diào)壓閥PCA403-04 1/2
PARKER派克調(diào)壓閥PCB403-04 1/2
PARKER派克調(diào)壓閥PCB403-04-D 1/2
PARKER派克調(diào)壓閥PFR100-M5 M5
PARKER派克調(diào)壓閥PFR200-02 1/4
PARKER派克調(diào)壓閥PFR302-03 3/8
PARKER派克調(diào)壓閥PFR302-03-D 3/8
PARKER派克調(diào)壓閥PFR403-04 1/2
PARKER派克調(diào)壓閥PFR403-04-D 1/2
PARKER派克調(diào)壓閥PAF200-02-B 1/4
PARKER派克調(diào)壓閥PAF302-03 3/8
PARKER派克調(diào)壓閥PAF302-03-D 3/8
PARKER派克調(diào)壓閥PAF404-04 1/2
PARKER派克調(diào)壓閥PAF404-04-D 1/2
PARKER派克調(diào)壓閥AU210-8 1/4
PARKER派克調(diào)壓閥AU200-8 1/42.3顯示方式儀表應(yīng)能在數(shù)字顯示、棒圖顯示、曲線顯示及其他顯示功能之間相互切換。數(shù)據(jù)存儲3.存儲介質(zhì)：可同時具有不同存儲介質(zhì)，每種存儲介質(zhì)應(yīng)符合說明書相應(yīng)要求。3.數(shù)據(jù)轉(zhuǎn)存：可選擇自動或手動方式在不同存儲介質(zhì)間轉(zhuǎn)存。3.數(shù)據(jù)存儲、記錄間隔和記錄時間應(yīng)符合說明書相應(yīng)要求。性能4.絕緣電阻儀表相應(yīng)端子之間絕緣電阻應(yīng)符合下表要求：測試點(diǎn)絕緣電阻/MΩ電源端子-地或機(jī)殼≥20輸入端子-地或機(jī)殼≥20輸入端子-電源端子≥204.絕緣強(qiáng)度儀表在一般試驗大氣條件下進(jìn)行絕緣強(qiáng)度試驗時，相應(yīng)端子之間施加下述試驗電壓見下表，歷時lmin，應(yīng)不會被擊穿或產(chǎn)生電弧和火花。儀表端子電壓標(biāo)稱值/V試驗電壓/kV<600.560~1301.0130~2501.5>2502.0彩色無紙記錄儀使用注意事項彩色無紙記錄儀采用320×240彩色液晶顯示屏,支持16通道模擬量通用輸入或8通道模擬輸出與12通道報警輸出。
PARKER派克調(diào)壓閥AU200-8-AD20 1/4
PARKER派克調(diào)壓閥AU321-10 3/8
PARKER派克調(diào)壓閥AU320-10 3/8
PARKER派克調(diào)壓閥AU320-10-AD41 3/8
PARKER派克調(diào)壓閥AU421-15 1/2
PARKER派克調(diào)壓閥AU420-15 1/2
PARKER派克調(diào)壓閥AU420-15-AD41 1/2
PARKER派克電磁閥PHS541S-10-24V 3/8
PARKER派克電磁閥PHS541S-10-24V-D 3/8
PARKER派克電磁閥PHS541S-10-24V-DL 3/8
PARKER派克電磁閥PHS541S-10-24V-FL 3/8
PARKER派克電磁閥PHS541S-10-110V 3/8
PARKER派克電磁閥PHS541S-10-110V-D 3/8
PARKER派克電磁閥PHS541S-10-110V-DL 3/8
PARKER派克電磁閥PHS541S-10-110V-FL 3/8
PARKER派克電磁閥PHS541S-10-220V 3/8
PARKER派克電磁閥PHS541S-10-220V-D 3/8
PARKER派克電磁閥PHS541S-10-220V-DL 3/8
PARKER派克電磁閥PHS541S-10-220V-FL 3/8
PARKER派克電磁閥PHS541S-15-24V 1/2
PARKER派克電磁閥PHS541S-15-24V-D 1/2
PARKER派克電磁閥PHS541S-15-24V-DL 1/2
PARKER派克電磁閥PHS541S-15-24V-FL 1/2
PARKER派克電磁閥PHS541S-15-110V 1/2
PARKER派克電磁閥PHS541S-15-110V-D 1/2
PARKER派克電磁閥PHS541S-15-110V-DL 1/2
PARKER派克電磁閥PHS541S-15-110V-FL 1/2
PARKER派克電磁閥PHS541S-15-220V 1/2
PARKER派克電磁閥PHS541S-15-220V-D 1/2
PARKER派克電磁閥PHS541S-15-220V-DL 1/2
PARKER派克電磁閥PHS541S-15-220V-FL 1/2
PARKER派克電磁閥PHS541D-10-24V 3/8
PARKER派克電磁閥PHS541D-10-24V-D 3/8
PARKER派克電磁閥PHS541D-10-24V-DL 3/8
PARKER派克電磁閥PHS541D-10-24V-FL 3/8
PARKER派克電磁閥PHS541D-10-110V 3/8
PARKER派克電磁閥PHS541D-10-110V-D 3/8
PARKER派克電磁閥PHS541D-10-110V-DL 3/8
PARKER派克電磁閥PHS541D-10-110V-FL 3/8
PARKER派克電磁閥PHS541D-10-220V 3/8
PARKER派克電磁閥PHS541D-10-220V-D 3/8
PARKER派克電磁閥PHS541D-10-220V-DL 3/8
PARKER派克電磁閥PHS541D-10-220V-FL 3/8
PARKER派克電磁閥PHS510C-6-24V 1/8
PARKER派克電磁閥PHS510C-6-24V-L 1/8
PARKER派克電磁閥PHS510C-6-24V-D 1/8
PARKER派克電磁閥PHS510C-6-24V-D-L 1/8
PARKER派克電磁閥PHS510C-6-24V-DL 1/8
PARKER派克電磁閥PHS510C-6-110V 1/8
PARKER派克電磁閥PHS510C-6-110V-L 1/8
PARKER派克電磁閥PHS510C-6-110V-D 1/8
PARKER派克電磁閥PHS510C-6-110V-D-L 1/8
PARKER派克電磁閥PHS510C-6-110V-DL 1/8
PARKER派克電磁閥PHS510C-6-220V 1/8
PARKER派克電磁閥PHS510C-6-220V-L 1/8
PARKER派克電磁閥PHS510C-6-220V-D 1/8
PARKER派克電磁閥PHS510C-6-220V-D-L 1/8
PARKER派克電磁閥PHS510C-6-220V-DL 1/8
PARKER派克電磁閥PHS520P-02-24V 1/4
PARKER派克電磁閥PHS520P-02-24V-D 1/4
PARKER派克電磁閥PHS520P-02-24V-DL 1/4
PARKER派克電磁閥PHS520P-02-24V-FL 1/4
PARKER派克電磁閥PHS520P-02-110V 1/4
PARKER派克電磁閥PHS520P-02-110V-D 1/4
PARKER派克電磁閥PHS520P-02-110V-DL 1/4
PARKER派克電磁閥PHS520P-02-110V-FL 1/4
PARKER派克電磁閥PHS520P-02-220V 1/4
PARKER派克電磁閥PHS520P-02-220V-D 1/4
PARKER派克電磁閥PHS520P-02-220V-DL 1/4
PARKER派克電磁閥PHS520P-02-220V-FL 1/4
PARKER派克電磁閥PHS520E-02-24V 1/4
PARKER派克電磁閥PHS520E-02-24V-D 1/4
PARKER派克電磁閥PHS520E-02-24V-DL 1/4
PARKER派克電磁閥PHS520E-02-24V-FL 1/4
PARKER派克電磁閥PHS520E-02-110V 1/4
PARKER派克電磁閥PHS520E-02-110V-D 1/4
PARKER派克電磁閥PHS520E-02-110V-DL 1/4
PARKER派克電磁閥PHS520E-02-110V-FL 1/4
PARKER派克電磁閥PHS520E-02-220V 1/4
PARKER派克電磁閥PHS520E-02-220V-D 1/4
PARKER派克電磁閥PHS520E-02-220V-DL 1/4
PARKER派克電磁閥PHS520E-02-220V-FL 1/4
PARKER派克電磁閥PHS530D-03-24V 3/8
PARKER派克電磁閥PHS530D-03-24V-D 3/8
PARKER派克電磁閥PHS530D-03-24V-DL 3/8
PARKER派克電磁閥PHS530D-03-24V-FL 3/8
PARKER派克電磁閥PHS530D-03-110V 3/8
PARKER派克電磁閥PHS530D-03-110V-D 3/8
PARKER派克電磁閥PHS530D-03-110V-DL 3/8
PARKER派克電磁閥PHS530D-03-110V-FL 3/8
PARKER派克電磁閥PHS530D-03-220V 3/8
PARKER派克電磁閥PHS530D-03-220V-D 3/8
PARKER派克電磁閥PHS530D-03-220V-DL 3/8
PARKER派克電磁閥PHS530D-03-220V-FL 3/8
PARKER派克電磁閥PHS540S-10-24V 3/8
PARKER派克電磁閥PHS540S-10-24V-D 3/8
PARKER派克電磁閥PHS540S-10-24V-DL 3/8
PARKER派克電磁閥PHS540S-10-24V-FL 3/8
PARKER派克電磁閥PHS540S-10-110V 3/8
PARKER派克電磁閥PHS540S-10-110V-D 3/8
PARKER派克電磁閥PHS540S-10-110V-DL 3/8
PARKER派克電磁閥PHS540S-10-110V-FL 3/8
PARKER派克電磁閥PHS540S-10-220V 3/8
PARKER派克電磁閥PHS540S-10-220V-D 3/8
PARKER派克電磁閥PHS540S-10-220V-DL 3/8
PARKER派克電磁閥PHS540S-10-220V-FL 3/8
PARKER派克電磁閥PHS530C-03-24V 3/8
PARKER派克電磁閥PHS530C-03-24V-D 3/8
PARKER派克電磁閥PHS530C-03-24V-DL 3/8
PARKER派克電磁閥PHS530C-03-24V-FL 3/8
PARKER派克電磁閥PHS530C-03-110V 3/8
PARKER派克電磁閥PHS530C-03-110V-D 3/8
PARKER派克電磁閥PHS530C-03-110V-DL 3/8
PARKER派克電磁閥PHS530C-03-110V-FL 3/8
PARKER派克電磁閥PHS530C-03-220V 3/8
PARKER派克電磁閥PHS530C-03-220V-D 3/8
PARKER派克電磁閥PHS530C-03-220V-DL 3/8
PARKER派克電磁閥PHS530C-03-220V-FL 3/8
PARKER派克電磁閥PHS530P-03-24V 3/8
PARKER派克電磁閥PHS530P-03-24V-D 3/8
PARKER派克電磁閥PHS530P-03-24V-DL 3/8
PARKER派克電磁閥PHS530P-03-24V-FL 3/8
PARKER派克電磁閥PHS530P-03-110V 3/8
PARKER派克電磁閥PHS530P-03-110V-D 3/8
PARKER派克電磁閥PHS530P-03-110V-DL 3/8
PARKER派克電磁閥PHS530P-03-110V-FL 3/8
PARKER派克電磁閥PHS530P-03-220V 3/8
PARKER派克電磁閥PHS530P-03-220V-D 3/8
PARKER派克電磁閥PHS530P-03-220V-DL 3/8
PARKER派克電磁閥PHS530P-03-220V-FL 3/8
PARKER派克電磁閥PHS530E-03-24V 3/8
PARKER派克電磁閥PHS530E-03-24V-D 3/8
PARKER派克電磁閥PHS530E-03-24V-DL 3/8
PARKER派克電磁閥PHS530E-03-24V-FL 3/8顯然不可取。為此，人們往往需要配備限制電機(jī)起動電流的起動設(shè)備，過去人們多采用Y/△轉(zhuǎn)換，自藕降壓，磁控降壓等方式來實(shí)現(xiàn)。這些方法雖然可以起到一定的限流作用，但沒有從根本上解決問題。伴隨傳動控制對自動化要求的不斷提高，采用可控硅為主要器件、單片機(jī)為控制核心的智能型電動機(jī)起動設(shè)備－軟起動器，已在各行各業(yè)得到越來越多的應(yīng)用，由于軟起動器性能優(yōu)良、體積小、重量輕，并且具有智能控制及多種保護(hù)功能，而且各項起動參數(shù)可根據(jù)不同負(fù)載進(jìn)行調(diào)整，其負(fù)載適應(yīng)性很強(qiáng)。因此電子式軟起動器將逐步取代落后的Y/Δ、自耦減壓和磁控式等傳統(tǒng)的減壓起動設(shè)備成為必然。電力電子技術(shù)的快速發(fā)展，智能型軟起動器得到廣泛應(yīng)用。智能型軟起動器是一種集軟起動、軟停車、輕載節(jié)能和多功能保護(hù)于一體的新穎電機(jī)控制裝置。
PARKER派克電磁閥PHS530E-03-110V 3/8
PARKER派克電磁閥PHS530E-03-110V-D 3/8
PARKER派克電磁閥PHS530E-03-110V-DL 3/8
PARKER派克電磁閥PHS530E-03-110V-FL 3/8
PARKER派克電磁閥PHS530E-03-220V 3/8
PARKER派克電磁閥PHS530E-03-220V-D 3/8
PARKER派克電磁閥PHS530E-03-220V-DL 3/8
PARKER派克電磁閥PHS530E-03-220V-FL 3/8
PARKER派克電磁閥PHS530S-03-24V 3/8
PARKER派克電磁閥PHS530S-03-24V-D 3/8
PARKER派克電磁閥PHS530S-03-24V-DL 3/8
PARKER派克電磁閥PHS530S-03-24V-FL 3/8
PARKER派克電磁閥PHS530S-03-110V 3/8
PARKER派克電磁閥PHS530S-03-110V-D 3/8
PARKER派克電磁閥PHS530S-03-110V-DL 3/8
PARKER派克電磁閥PHS530S-03-110V-FL 3/8
PARKER派克電磁閥PHS530S-03-220V 3/8
PARKER派克電磁閥PHS530S-03-220V-D 3/8
PARKER派克電磁閥PHS530S-03-220V-DL 3/8
PARKER派克電磁閥PHS530S-03-220V-FL 3/8
PARKER派克電磁閥PHS520C-02-24V 1/4
PARKER派克電磁閥PHS520C-02-24V-D 1/4
PARKER派克電磁閥PHS520C-02-24V-DL 1/4
PARKER派克電磁閥PHS520C-02-24V-FL 1/4
PARKER派克電磁閥PHS520C-02-110V 1/4
PARKER派克電磁閥PHS520C-02-110V-D 1/4
PARKER派克電磁閥PHS520C-02-110V-DL 1/4
PARKER派克電磁閥PHS520C-02-110V-FL 1/4
PARKER派克電磁閥PHS520C-02-220V 1/4
PARKER派克電磁閥PHS520C-02-220V-D 1/4
PARKER派克電磁閥PHS520C-02-220V-DL 1/4
PARKER派克電磁閥PHS520C-02-220V-FL 1/4
PARKER派克電磁閥PHS541D-15-24V 1/2
PARKER派克電磁閥PHS541D-15-24V-D 1/2
PARKER派克電磁閥PHS541D-15-24V-DL 1/2
PARKER派克電磁閥PHS541D-15-24V-FL 1/2
PARKER派克電磁閥PHS541D-15-110V 1/2
PARKER派克電磁閥PHS541D-15-110V-D 1/2
PARKER派克電磁閥PHS541D-15-110V-DL 1/2
PARKER派克電磁閥PHS541D-15-110V-FL 1/2
PARKER派克電磁閥PHS541D-15-220V 1/2
PARKER派克電磁閥PHS541D-15-220V-D 1/2
PARKER派克電磁閥PHS541D-15-220V-DL 1/2
PARKER派克電磁閥PHS541D-15-220V-FL 1/2
PARKER派克電磁閥PHS520S-02-24V 1/4
PARKER派克電磁閥PHS520S-02-24V-D 1/4
PARKER派克電磁閥PHS520S-02-24V-DL 1/4
PARKER派克電磁閥PHS520S-02-24V-FL 1/4
PARKER派克電磁閥PHS520S-02-110V 1/4
PARKER派克電磁閥PHS520S-02-110V-D 1/4
PARKER派克電磁閥PHS520S-02-110V-DL 1/4
PARKER派克電磁閥PHS520S-02-110V-FL 1/4
PARKER派克電磁閥PHS520S-02-220V 1/4
PARKER派克電磁閥PHS520S-02-220V-D 1/4
PARKER派克電磁閥PHS520S-02-220V-DL 1/4
PARKER派克電磁閥PHS520S-02-220V-FL 1/4
PARKER派克電磁閥PHS530SX-03-24V 3/8
PARKER派克電磁閥PHS530SX-03-24V-FL 3/8
PARKER派克電磁閥PHS530SX-03-110V 3/8
PARKER派克電磁閥PHS530SX-03-110V-FL 3/8
PARKER派克電磁閥PHS530SX-03-220V 3/8
PARKER派克電磁閥PHS530SX-03-220V-FL 3/8
PARKER派克電磁閥PHS540D-10-24V 3/8
PARKER派克電磁閥PHS540D-10-24V-D 3/8
PARKER派克電磁閥PHS540D-10-24V-DL 3/8準(zhǔn)確限值系數(shù)就是表示這種特性。保護(hù)用互感器準(zhǔn)確等級5P、10P，表示在額定準(zhǔn)確限值一次電流時的允許電流誤差為1%、3%，其復(fù)合誤差分別為5%、10%線路發(fā)生故障時的沖擊電生熱和電磁力，保護(hù)用電流互感器必須承受。二次繞組短路情況下，電流互感器在一秒內(nèi)能承受而無損傷的一次電流有效值，稱額定短時熱電流。二次繞組短路情況下，電流互感器能承受而無損傷的一次電流峰值，稱額定動穩(wěn)定電流。保護(hù)用電流互感器的精度等級5P/10P，10P標(biāo)示復(fù)合誤差不超過10%。按絕緣介質(zhì)分類干式電流互感器[4]：由普通絕緣材料經(jīng)浸漆處理作為絕緣。澆注式電流互感器：用環(huán)氧樹脂或其他樹脂混合材料澆注成型的電流互感器。油浸式電流互感器：由絕緣紙和絕緣油作為絕緣。
PARKER派克電磁閥PHS540D-10-24V-FL 3/8
PARKER派克電磁閥PHS540D-10-110V 3/8
PARKER派克電磁閥PHS540D-10-110V-D 3/8
PARKER派克電磁閥PHS540D-10-110V-DL 3/8
PARKER派克電磁閥PHS540D-10-110V-FL 3/8
PARKER派克電磁閥PHS540D-10-220V 3/8
PARKER派克電磁閥PHS540D-10-220V-D 3/8
PARKER派克電磁閥PHS540D-10-220V-DL 3/8
PARKER派克電磁閥PHS540D-10-220V-FL 3/8
PARKER派克電磁閥PHS540D-15-24V 1/2
PARKER派克電磁閥PHS540D-15-24V-D 1/2
PARKER派克電磁閥PHS540D-15-24V-DL 1/2
PARKER派克電磁閥PHS540D-15-24V-FL 1/2
PARKER派克電磁閥PHS540D-15-110V 1/2
PARKER派克電磁閥PHS540D-15-110V-D 1/2
PARKER派克電磁閥PHS540D-15-110V-DL 1/2
PARKER派克電磁閥PHS540D-15-110V-FL 1/2
PARKER派克電磁閥PHS540D-15-220V 1/2
PARKER派克電磁閥PHS540D-15-220V-D 1/2
PARKER派克電磁閥PHS540D-15-220V-DL 1/2
PARKER派克電磁閥PHS540D-15-220V-FL 1/2
PARKER派克電磁閥PHS540S-15-24V 1/2
PARKER派克電磁閥PHS540S-15-24V-D 1/2
PARKER派克電磁閥PHS540S-15-24V-DL 1/2
PARKER派克電磁閥PHS540S-15-24V-FL 1/2
PARKER派克電磁閥PHS540S-15-110V 1/2
PARKER派克電磁閥PHS540S-15-110V-D 1/2
PARKER派克電磁閥PHS540S-15-110V-DL 1/2
PARKER派克電磁閥PHS540S-15-110V-FL 1/2
PARKER派克電磁閥PHS540S-15-220V 1/2
PARKER派克電磁閥PHS540S-15-220V-D 1/2
PARKER派克電磁閥PHS540S-15-220V-DL 1/2
PARKER派克電磁閥PHS540S-15-220V-FL 1/2
PARKER派克電磁閥PHS520D-02-24V 1/4
PARKER派克電磁閥PHS520D-02-24V-D 1/4
PARKER派克電磁閥PHS520D-02-24V-DL 1/4
PARKER派克電磁閥PHS520D-02-24V-FL 1/4過流繼電器分為感應(yīng)電磁式和集成電路型，具有定時限、反時限的特性，應(yīng)用于電機(jī)、變壓器等主設(shè)備以及輸配電系統(tǒng)的繼電保護(hù)回路中。當(dāng)主設(shè)備或輸配電系統(tǒng)出現(xiàn)過負(fù)荷及短路故障時，該繼電器能按預(yù)定的時限可靠動作或發(fā)出信號，切除故障部分，保證主設(shè)備及輸配電系統(tǒng)的。中文名過流繼電器外文名Overcurrentrelay安裝方式凸出式電流整定范圍2-20A型號GL-RGL-RGL-13/II輔助電源無源目錄1電器介紹2設(shè)備介紹?原理?技術(shù)參數(shù)?額定工作電壓?直流電阻?吸合電流?釋放電流?電壓電流?觸點(diǎn)性能?熱性能要求?介質(zhì)強(qiáng)度?壽命3過流繼電器?用途?正常環(huán)境?技術(shù)指標(biāo)?整定方法4測試項目?觸點(diǎn)電阻?線圈電阻?吸合電壓電流?釋放電壓電流5電符號和觸點(diǎn)6選用7反時限8正常環(huán)境9技術(shù)指標(biāo)電器介紹編輯過流繼電器的動作原理是復(fù)合式的,它由感應(yīng)式和電磁式的兩個元件組成,兩個元件公用一個線圈。
PARKER派克電磁閥PHS520D-02-110V 1/4
PARKER派克電磁閥PHS520D-02-110V-D 1/4
PARKER派克電磁閥PHS520D-02-110V-DL 1/4
PARKER派克電磁閥PHS520D-02-110V-FL 1/4
PARKER派克電磁閥PHS520D-02-220V 1/4
PARKER派克電磁閥PHS520D-02-220V-D 1/4
PARKER派克電磁閥PHS520D-02-220V-DL 1/4
PARKER派克電磁閥PHS520D-02-220V-FL 1/4
PARKER派克電磁閥PHS520DX-02-24V 1/4
PARKER派克電磁閥PHS520DX-02-24V-FL 1/4
PARKER派克電磁閥PHS520DX-02-110V 1/4
PARKER派克電磁閥PHS520DX-02-110V-FL 1/4
PARKER派克電磁閥PHS520DX-02-220V 1/4
PARKER派克電磁閥PHS520DX-02-220V-FL 1/4
PARKER派克電磁閥PHS520SX-02-24V 1/4
PARKER派克電磁閥PHS520SX-02-24V-FL 1/4
PARKER派克電磁閥PHS520SX-02-110V 1/4
PARKER派克電磁閥PHS520SX-02-110V-FL 1/4
PARKER派克電磁閥PHS520SX-02-220V 1/4
PARKER派克電磁閥PHS520SX-02-220V-FL 1/4
PARKER派克電磁閥PHS510E-6-24V 1/8
PARKER派克電磁閥PHS510E-6-24V-L 1/8
PARKER派克電磁閥PHS510E-6-24V-D 1/8
PARKER派克電磁閥PHS510E-6-24V-D-L 1/8
PARKER派克電磁閥PHS510E-6-24V-DL 1/8
PARKER派克電磁閥PHS510E-6-110V 1/8
PARKER派克電磁閥PHS510E-6-110V-L 1/8
PARKER派克電磁閥PHS510E-6-110V-D 1/8
PARKER派克電磁閥PHS510E-6-110V-D-L 1/8
PARKER派克電磁閥PHS510E-6-110V-DL 1/8
PARKER派克電磁閥PHS510E-6-220V 1/8
PARKER派克電磁閥PHS510E-6-220V-L 1/8
PARKER派克電磁閥PHS510E-6-220V-D 1/8
PARKER派克電磁閥PHS510E-6-220V-D-L 1/8
PARKER派克電磁閥PHS510E-6-220V-DL 1/8
PARKER派克電磁閥PHS510P-6-24V 1/8
PARKER派克電磁閥PHS510P-6-24V-L 1/8過熱保護(hù)功能：通過軟起動器內(nèi)部熱繼電器檢測晶閘管散熱器的溫度，一旦散熱器溫度超過允許值后自動關(guān)斷晶閘管，并發(fā)出報警信號。測量回路參數(shù)功能：電動機(jī)工作時，軟啟動器內(nèi)的檢測器一直監(jiān)視著電動機(jī)運(yùn)行狀態(tài)，并將監(jiān)測到的參數(shù)送給CPU進(jìn)行處理，CPU將監(jiān)測參數(shù)進(jìn)行分析、存儲、顯示。因此電動機(jī)軟起動器還具有測量回路參數(shù)的功能。其它功能：通過電子電路的組合，還可在系統(tǒng)中實(shí)現(xiàn)其它種種聯(lián)鎖保護(hù)。主要應(yīng)用交流鼠籠異步電動機(jī)由于結(jié)構(gòu)簡單，控制方便，效率高而被人們廣泛地應(yīng)用于機(jī)械設(shè)備的拖動中。在民用建筑中的大多數(shù)機(jī)械設(shè)備如消防泵、噴淋泵、生活泵、冷凍機(jī)組等的動力都是交流鼠籠異步電機(jī)。當(dāng)建筑物層數(shù)較高或規(guī)模較大時。
PARKER派克電磁閥PHS510P-6-24V-D 1/8
PARKER派克電磁閥PHS510P-6-24V-D-L 1/8
PARKER派克電磁閥PHS510P-6-24V-DL 1/8
PARKER派克電磁閥PHS510P-6-110V 1/8
PARKER派克電磁閥PHS510P-6-110V-L 1/8
PARKER派克電磁閥PHS510P-6-110V-D 1/8
PARKER派克電磁閥PHS510P-6-110V-D-L 1/8
PARKER派克電磁閥PHS510P-6-110V-DL 1/8
PARKER派克電磁閥PHS510P-6-220V 1/8
PARKER派克電磁閥PHS510P-6-220V-L 1/8
PARKER派克電磁閥PHS510P-6-220V-D 1/8
PARKER派克電磁閥PHS510P-6-220V-D-L 1/8
PARKER派克電磁閥PHS510P-6-220V-DL 1/8
PARKER派克電磁閥PHS510D-6-24V 1/8
PARKER派克電磁閥PHS510D-6-24V-L 1/8
PARKER派克電磁閥PHS510D-6-24V-D 1/8
PARKER派克電磁閥PHS510D-6-24V-D-L 1/8
PARKER派克電磁閥PHS510D-6-24V-DL 1/8
PARKER派克電磁閥PHS510D-6-110V 1/8
PARKER派克電磁閥PHS510D-6-110V-L 1/8
PARKER派克電磁閥PHS510D-6-110V-D 1/8
PARKER派克電磁閥PHS510D-6-110V-D-L 1/8
PARKER派克電磁閥PHS510D-6-110V-DL 1/8
PARKER派克電磁閥PHS510D-6-220V 1/8
PARKER派克電磁閥PHS510S-6-220V-L 1/8
PARKER派克電磁閥PHS510S-6-220V-D 1/8
PARKER派克電磁閥PHS510S-6-220V-D-L 1/8
PARKER派克電磁閥PHS510S-6-220V-DL 1/8
PARKER派克電磁閥PHS510S-6-24V 1/8
PARKER派克電磁閥PHS510S-6-24V-L 1/8
PARKER派克電磁閥PHS510S-6-24V-D 1/8
PARKER派克電磁閥PHS510S-6-24V-D-L 1/8
PARKER派克電磁閥PHS510S-6-24V-DL 1/8
PARKER派克電磁閥PHS510S-6-110V 1/8
PARKER派克電磁閥PHS510S-6-110V-L 1/8
PARKER派克電磁閥PHS510S-6-110V-D 1/8
PARKER派克電磁閥PHS510S-6-110V-D-L 1/8
PARKER派克電磁閥PHS510S-6-110V-DL 1/8
PARKER派克電磁閥PHS510S-6-220V 1/8
PARKER派克電磁閥PHS510S-6-220V-L 1/8
PARKER派克電磁閥PHS510S-6-220V-D 1/8
PARKER派克電磁閥PHS510S-6-220V-D-L 1/8
PARKER派克電磁閥PHS510S-6-220V-DL 1/8
總之，只有了解用戶、了解任務(wù)才能設(shè)計出好的人機(jī)界面。確定為完成此系統(tǒng)功能人和計算機(jī)應(yīng)分別完成的任務(wù)任務(wù)分析有兩種途徑。一種是從實(shí)際出發(fā)，通過對原有處于手工或半手工狀態(tài)下的應(yīng)用系統(tǒng)的剖析，將其映射為在人機(jī)界面上執(zhí)行的一組類似的任務(wù)；另一種是通過研究系統(tǒng)的需求規(guī)格說明，導(dǎo)出一組與用戶模型和系統(tǒng)假想相協(xié)調(diào)的用戶任務(wù)。逐步求精和面向?qū)ο蠓治龅燃夹g(shù)同樣適用于任務(wù)分析。逐步求精技術(shù)可把任務(wù)不斷劃分為子任務(wù)，直至對每個任務(wù)的要求都十分清楚；而采用面向?qū)ο蠓治黾夹g(shù)可識別出與應(yīng)用有關(guān)的所有客觀的對象以及與對象關(guān)聯(lián)的動作�？紤]界面設(shè)計中的典型問題設(shè)計任何一個機(jī)界面，一般必須考慮系統(tǒng)響應(yīng)時間、用戶求助機(jī)制、錯誤信息處理和命令方式四個方面。
