电压测量综述

1、01( )TUu t dtT01( )TUu t dtT20.637ppUVV201( )TVutd tT10.7072ppVVVppVKV峰 值有 效 值FVKV有效值平均值21.41/2pppVKV(1/2)1.112/2 2pFpVKV（）2JefVKVh22014R FVVV输输入入电电路路A A/ /D D转转换换器器数数字字显显示示器器逻逻辑辑控控制制电电路路时时钟钟发发生生器器模模拟拟部部分分数数字字部部分分Vx逐逐次次逼逼近近移移位位寄寄存存器器( (S SA AR R) )D/A转转换换器器Vx+-比比较较器器C CL LK KSTARTA/D转转换换结结果果2-12-nMS

2、BLSBVrN N2xrnNVV斜斜波波电电压压发发生生器器QQSETCLRSR&000时时钟钟计计数数器器主主门门VrVx+-+-门门控控信信号号输输入入比比较较器器接接地地比比较较器器a计计数数输输入入0VxVx、V Vr r门门控控信信号号计计数数输输入入NV Vr rt1bT0TrVkRC2111tomxxtTVV dtVR CR C 32210()tomromrtTVV dtVVRCRC21xrTVVT221xrNVVeNN主主门门高高位位计计数数器器A A逻逻辑辑控控制制电电路路数数字字输输出出时时钟钟S1S2CRVx-Vr积积分分器器比比较较器器-+-+S S1 1S S2 2V

3、ot0t1复复零零t2t31VoVomT1T2N1N2t积积分分波波形形计计数数器器输输入入a.b.清清零零低低位位计计数数器器B B主主门门清清零零-+ABR1R2R3t32T3N3VtVr/10nVtN N2 2N3f0T0T0T0231110nxrTTTVVRCRC2311()10rxnVVNNeNNminmin)(TCRTCrRLds I0u(t)D1D2D3D4CCu(t)D1D2I001( )( )22Todmdmu tu tIdtTrrrr2( )ut0TAu(t)Vrms2212(.)kVkVV21.4121.41ppKKp（任意波）峰值V（任意波）有效值V221222pppp

4、KKKK波峰因数0.90.9FK（任意波）均值V（任意波）有效值V0.910.91.1110.90.9FFFFFKKKKK波形因数1 1.4100%29%1.4 1 0.9100%11%0.9411( )(sinsin 3sin 5.)35pu tVtttVP0T=1uStu(t)224111.352ppVVV22224111110.9735792ppVV100%3%VV 213433( %)xmVVV ( %)xVVn 字A AC C/ /D DC CI I/ /V VZ Z/ /V VD DV VM MC CP PU UD DC CA AC CI IZ ZIx9009090.90.1(20

5、0mV)200A A(200mV)2mA A(200mV)20mA A(200mV)200mA A(200mV)2A A恒恒流流源源( (可可调调) )A A/ /D DR Rx xIr-+A Am mp p恒恒流流源源( (可可调调) )A A/ /D D-+A Am mp pIrVrR1Rx精精密密电电阻阻VoVr取取样样电电阻阻大电阻要求恒流源小影响测量精度( %)xmVVV ( %)xVVn 字HLI0DVMRsVxRiisissRRRRRRi XsIVRI00 ( %)/xmVV0.015100%100%0.3%5.00 xxxVV 0.025100%100%0.17%15.00 x

6、xxVV 001iRIsixIRRV 936611 102 103 101000 102 935611 102 101.2 101000 100.2 12LSBUosIB-+RC积积分分器器ViVoUosVot实实际际积积分分器器输输出出理理想想积积分分器器输输出出Uos+-AViVo=A(Vi+Uos)Uos+-AViVo=AVi+Uos+-+-K1K2K3+-C0A1+AosU1oososAVUUA11oiososiosiosAAVA VUUAVUAVUAA000A/D转转换换器器VxVr0VNxNrN0衰衰减减/ /放放大大器器转转换换系系数数k k总总漂漂移移U Uo os sS1S2S30osNkU()rrosNk