ABBNTST01ABBNTST01ABBNTST01根据采样信号的不同，可分为直流采样与交流采样两大类。直流采样是把交流电压、电流信号转化为0～5V的直流电压，再送到A/D转换器进行转换。即A/D转换器采样的模拟量为直流信号。它的主要特点是：数据刷新速度快，随着元器件技术的发展，稳定度、***度大为提高。交流采样是相对直流采样而言，直接对交流电压和电流波形进行采样，然后通过一定的算法计算出电压、电流的有效值、有功功率、无功功率等。交流采样对环境温度有一定要求，同时对A/D转换器的转换速度和采样保持器要求较高;为了保证测量精度，一个周期内，必须保证足够的采样点数，而且采样计算程序相对复杂，对CPU要求较高，因此该仪器采用直流采样。2.3功率因素检测模块功率因素检测模块有两大功能：（1）判别电压是超前还是滞后电流;（2）判别功率因素大小。具体相关电路如图4所示。是当电压超前电流时，U15B输出为"1";反之输出为"0"。电压、电流的正弦波形分别经过零比较器后（电路忽略）转换为方波，输入2/4译码电路。译码电路只有当A、B信号为"01"或"10"时X端口才输出Vref，对积分电路充电;当A、B信号为"00"或"11"时，输出端口为零。而A、B信号为"01"或"10"的时间正是电压、电流相位差的时间。时间越长，对电容C23充电的时间也越长。因此，电容上的电压反映了相位差的大小。CPU经过数据处理可确定功率因素的大小。2.4以太网接口模块以太网接口模块选用RealTek公司的RTL8019AS全双工以太网控制器，主要功能是处理以太网协议。它自带16KB的SRAM，并通过RJ45接口与以太网通信。数据的流向为：请求信息从以太网来，通过RJ45送到RTL8019AS，处理后的数据包送入SX52BD协议栈，由协议栈对数据包进行解析，得到原始请求信息。请求信息再经过SX52BDSX52BD的处理，产生回复信息。回复信息到以太网的过程与上述过程正好相反。2.5其它模块电路EEPROM：CPU通过I2C总线访问EEPROM器件24C25624C256。网页就存储在EEPROM中。EEPROM中的网页内容通过主CPU的读写操作可以实现网页的浏览、重新***和更新。受容量的限制它不可能存储大量页面。时钟模块电路：选用了时钟芯片DS12B887DS12B887。它可以产生秒、分、时、日、星期、月及年等七个时标。可以通过编程读取和修改这些时标，也可以编程产生定时中断。采用硬时钟，可以不占用单片机的定时器资源，减轻软件设计量。看门狗电路：电***测仪的工作环境通常具有强烈的电磁干扰，在工作要求极高的情况下为了防止干扰，引入了看门狗电路。采用MAX813LMAX813L芯片。该芯片具有监控电路，如果程序在1.6s之内还不给MAX813L"喂狗信号"，它就会产生看门狗输出，系统复位。6***3530-1RR016***3607-1JC30-OAX16***6643-0CD01-1AX12460444-80028LOOPUART______________2460446-8001CMU(7K)2460451-8004FWUART8.727322461306-8001LOOPBACKCONNKIT2491178-80034KMEMORYBOARD(OB)2491809-8002520C/530CREL2.6UP*GRADE2492144-8001CONNKIT,500-50092492144-8002CONNKIT2492144-8003CONNKIT2492144-8004CONNKIT2492144-8005CONNKIT2492144-8007CONNKIT2492144-8008CONNKIT,500-50472492144-8012CONNKIT,HIDENSITY500-50302493295-0003RUNTIMECVUKYBDCVUENH2493625-8003530CBATTERYDOOR25806-485TI48INCABLEEXTENTION2586323-8001525O.S.UPGRADE25863-2425863-24/2FOOTCABLE25863-6025863-60/R/WPROG.CABL2586491-8003525MEMUPGRADE-12K2587676-8003OCIREPLACEMENTKIT2587678-8002BATTERYKIT2587678-8003BATTERYKIT2587678-8004BATTERYKIT2587678-8006BATTERYKIT2587679-8001FUSE2587679-8002FUSE2587679-8003FUSE2587679-8005FUSE2587679-8006FUSE,3AFOR500-50232587679-8007FUSE,1/5AFOR500-50092587679-8009FUSE,1/2A,MIN(5PERPACK)2587679-8009FUSE1/2AMIN(5PERPACK)2587679-8010FUSE2587679-8011FUSE2587679-80123AMP125VFUSE2587679-8013FUSE,5A250VFOR500-50612587679-80143.15A125VFUSE2587679-8015FUSE,3A250VSLOFOR500-50102587679-8016FUSE2587679-8017FUSE2587681-8001USEREPROM2KX4FOR520/5302587681-8004EPROM32KX8500SER2587681-8005RAMS2587681-8006RAMS2587681-8007EPROMS,2KX8,5TI2587681-8008EPROM2587681-8012EPROM,32KX8,530C2587681-8015EPROM,2732A2587681-8017EPROM2587681-8020USEREPROM32KX8FOR5252587681-8022USEREEPROM,128KX8FOR545BD2587681-8023EPROM2587681-8028USEREPROM,505-71012587681-8031555USEREPROMKIT2587681-8032555OSFIRMWAREUPGRADEK2587681-8033555OSFIRMWAREUPGRADE12587681-8034555OSFIRMWAREUPGRADE32587681-8035555-1101/2REL3.1FIRMWARUPG2587681-80372587681-80372587693-8004MINIKEYLOCKASSY2587693-8005STDKEYLOCKASSY2587693-8006REPLACEKEYSTD2587693-8007MINIKEY2587693-8008SHIELD2587693-8009MODULE2587693-8010CABLEASSY,FIBERO*PTIC560-H2587695-8011HBUS/WREL3.02587695-8015RBCS/WREL1.212587695-8018S/WGLOBALMEM208KREL12587695-8022RBC(505)S/WREL2.02587695-8023565SFCPUS/WREL3.3(565-2120)2587695-8024RCCS/WREL3.512587695-8025RCC(ASIC)S/WREL4.512587695-8027560-2120CPUS/WREL3.22587695-8029RCCS/WREL3.522587695-8030RCC(ASIC)S/WRL4.522587695-8032565PREL2.0S/W2587695-8035UPGRADEKIT2587695-8037UPGRADEKIT2587695-8038505-7201UPG.,REL3.1WITHMAN2587695-8038505-7201UPG.REL3.1WITHMAN2587695-8039560TF/WUPGRADEREL6.12587704-8001505FUSEHOLDER2587704-80025055AMPRELAY2587705-8001505BEZELSCREW(10PKG)2587705-8002505I/OCONNECTOR2587705-8004KIT2587705-8005KIT2587705-8006CONN2587705-8009505-7038CALIBRATIONCONN40P2587716-8001KEYBRD,RUNTIMEAT2587716-8002KEYBRD,RUNTIMEENH2587716-8034ATMVGAADPTCBL,9M-15F2587731-8001505SOFTWAREUPGRADE2587755-8001HBUTRI-SPLITTERASSY2589739-80019SLOTSUPPORTRAILFOR5752589739-8002P2SUPPORTRAIL2589739-80031INBLANKBEZEL575SPARE2589739-8004FILLERPANEL0.2IN575SPARE2589739-8005FILLERPANEL0.4IN575SPARE2589739-8008FUSE8AMP2589739-8009IC2589739-8010IC,68882COPROSSER,575SPARES2589739-8011DAISYCHAINJUMPASSY,575SPAR2589739-8012575J2POWERCONNECTOR2589739-80150.6INBLANKFILLERPANEL2589739-801616SLOTMOUNTINGRAILS2592901-0004MANUAL530TRAINING2592901-8001560/5TROUBLESHOOTGASSE2592901-81232592901-81232601099-8002OBSOLETE545REL1.3SPAR2601099-8003545REL2.0OSUPGRADE2601099-8004545REL2.1OSUPGRADE2601099-8006545-1102REL3.1FIRMWAREUPG2601099-8007545-1101REL2.2FIRMWAREUPG2601166-00032601166-00032601166-0011CVU10KREL2.2SOFTWUPG2601166-0012CVU10000REL2.0MANUALSET2601170-0009CABLEA***VGA15M-15M19F2601438-8002500NIMREL4UPGRD2601438-8006MODBUS505NIMREL3.0UP2601438-8007MODBUS505NIMREL3.1UP2608542-0004GRAPHICSCARDPCIBUS#9G2704988-8001FILTERKIT2704989-8001FANKIT2704991-8002TCAMKEYBOARDASSY(OB)2801703-8007575SOFTWARE,REL3.1,UPGRADE2807669-00012807669-0001500-2108500-2108/I/OCHANNELCONTROL500-2109500-2109/DISTBASECONTROLLE500-2114-ATURBORBC,500-2114-A,W/MODEM500-2151-APOWERSUPPLY110/220VAC500-5001110VINPUTMODULE,500-5001500-5002220VACINMODULE,500-500250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