局部放電檢測(cè)原理ppt課件-資料下載頁(yè)
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【正文】 depends on its bandwidthΔf放大器的分辨率取決于它的頻帶寬度 Δf(1) Tuning amplifier(2) wideband or low frequency amplifier29 the resolution of the oscilloscope screen 示波器屏幕分辨率5. Impulse ResolutionThe minimum thickness of the luminous line on a normal oscilloscope screen is about 示波器上可分辨的發(fā)光線最小寬度約為 If the screen has a width of 100mm, it can resolve a maximum of 500 lines or impulses. Two quadrants of the 50Hz sine wave usually are displayed over the full width of the screen. Consequently, a maximum of 250 impulses per quadrant can be resolved.屏幕寬度為 100mm,可分辨最多 500個(gè)脈沖， 100mm為 2個(gè)象限的寬度，因此分辨率為500/2=25030 the total resolution5. Impulse Resolutiondetection circuit(1) RC circuit(2) RLC circuitamplifier(1) Tuning amplifier(2) wideband or low frequency amplifieroscilloscope screenrtotal is determined by the smallest one!總的分辨率由最小的一個(gè)決定316. Calibrationq(pC)V(mV)1mv ?pCCalibration!1. Direct calibration: q0 is injected into Cx2. Indirect calibration: q0 is injected into Ck直接標(biāo)定： q0注入試品 Cx兩端間接標(biāo)定： q0注入耦合電容 Ck兩端分度系數(shù) the principle of calibration32 the influences of calibration impulse on the results6. Calibration校正脈沖對(duì)校正結(jié)果的影響校正脈沖對(duì)校正結(jié)果的影響(1) Rise time of calibration impulseΔud↘τf↗ V(mV) V0↘↗q0(pC)lfor RC circuit脈沖上升時(shí)間影響33lfor RLC circuitThe rise time have no effect on calibration resultsud(t) has reached its crest value while calibration impulse has not yet increase to its peak value.6. Calibration上升沿時(shí)間對(duì)校正結(jié)果影響不大校正脈沖尚未上升到最大值而 ud(t)已過(guò)其峰值Δud↘ ↗(2) trailing time of calibration impulse 脈沖下降時(shí)間影響τt↘ V0↘ K0↗346. Calibration(3) Resistance of impulse generator 脈沖發(fā)生器內(nèi)阻影響(4) Selection of C0 C0 的選擇35The end36
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