ZC25型、ZC11型絕緣電阻表由手搖發電機磁電式及磁電式雙動圈流比計組成，而ZC7型由手搖交流發電機及整流系統，磁電系流比計組成。ZC29B型和ZC8型是根據電位計原理設計，由手搖交流發電機，相敏整流放大器、電位器、電流互感器及檢流計構成。三、型號及量程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 接地電阻測試儀ZC8-10-10-100-1000 ZC8-20-1-10-100 ZC29B-10-10-100-1000 ZC29B-20-1-10-100