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    1. 台湾标准电机SEW仪器仪表--4120 ER Earth Resistance Testers 3 Wire Digital
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        4120 ER   Earth Resistance Testers
        3 Wire (Digital)  
        4120 ER
         Capable of measuring earth voltage.
         2mA measuring current permits eath resistance to test without tripping earth leakage current breakers in the circuit.
         Test leads are supplied as standard accessories for simplified two-wire measuring system.
         Data hold function.
         Battery operated.
          Battery test indicator.
         , CAT III 300V.
         Calibration performed with supplied test leads.
        Measuring Ranges Earth Resistance : 0-19.99 Ohm/0-199.9 Ohm/0-1999 Ohm
        Earth Voltage : 0-199.9V AC (40-500Hz)
        Accuracy Earth Resistance : +/- (2%rdg+2dgt) at 200/2000 Ohm, +/- (2%rdg+0.1 Ohm) at 20 Ohm
        Earth Voltage : +/- (1%rdg+2dgt)
        Earth Resistance Resolution 0-19.99 Ohm (0.01 Ohm)
        0-199.9 Ohm (0.1 Ohm)
        0-1999 Ohm (1 Ohm)
        Measuring System Earth Resistance by constant current inverter 820 Hz approx. 2mA
        Low Battery Indication symbol appears on the diaplay
        Data Hold Indication symbol appears on the display
        Over Range Indication "1" (MSD)
        Display LCD LCD 3-1/2 digit (2000 counts)
        Power Source 1.5V SUM-3 (AA) x 8 or equivalent
        Dimensions 250(L) x 190(W) x 110(D) mm
        Weight Approx. 1500g (battery included)
        Accessories Test leads (AL-36 : red-15m, yellow-10m, green-5m)
        Auxiliary earth spikes
        Simplified measurement probe
        Shoulder belt
        Instruction manual, batteries
        特 點
        ● 可供量測接地電阻和接地電壓。
        ● 量測電流僅有2mA,不會影響漏電斷路器的跳脫。
        ● 可作三線式量測或兩線式量測。
        ● 量測數值鎖定。
        ● 電源不足顯示。
        ● 使用電池操作。
        ● 請使用提供的測試線測試。
        ● CAT III 300V
        規 格
        量測檔位 接地電阻 : 0-20Ω/0-200Ω/0-2000Ω
        接地電壓 : 0-200V AC(40-500Hz)
        準確度 接地電阻 : ±(2%讀值+2位數)
        接地電壓 : ±(1%讀值+2位數)
        接地電阻解析度 0-20Ω : 0.01Ω
        0-200Ω : 0.1Ω
        0-2000Ω :
        量測系列 820Hz 2mA定電流
        顯示器 液晶顯示器(LCD)3位, Z大顯示1999
        接線正確並作量測 紅燈(LED)會亮著
        電量不足指示 LCD 上出現 : 符號
        數值鎖定指示 LCD 上出現 : 符號
        過載指示 LCD 上出現 : 1
        外形尺寸 250(長)×190(寬)×110(高)mm
        重量 約1500克(含電池)
        使用電池 1.5V (AA)×8(顆)

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