ZC25型、ZC11型绝缘电阻表由手摇发电机磁电式及磁电式双动圈流比计组成,而ZC7型由手摇交流发电机及整流系统,磁电系流比计组成。ZC29B型和ZC8型是根据电位计原理设计,由手摇交流发电机,相敏整流放大器、电位器、电流互感器及检流计构成。三、型号及量程ZC25-1100V100M ZC25-2250V250M ZC25-3500V500M ZC25-41000V1000M ZC11-102500V2500M ZC11-1100V500M ZC11-2250V1000M ZC11-3500V2000M ZC11-41000V5000M ZC11-52500V10000M ZC11-6100V20M ZC11-7250V50M ZC11-8500V100M ZC11-950V200M ZC7-1500V500M ZC7-21000V1000M ZC7-32500V2500M ZC7-42500V5000M 接地电阻测试仪ZC8-10-10-100-1000 ZC8-20-1-10-100 ZC29B-10-10-100-1000 ZC29B-20-1-10-100