台湾标准电机SEW仪器仪表--1805 ER Earth Resistance Testers 3 Wire Analog
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            1805 ER   Earth Resistance Testers
            3 Wire (Analog)  
            1805 ER
            FEATURES
             
             High quality Tau Band movement.
             Capable of measuring earth voltage (Vac).
             2mA measuring current permits earth resistance tests with tripping earth leakage current breakers in the circuit under test.
             Test leads are supplied as standard accessories for simplified two-wire measuring system.
             Battery operated.
             Battery life indication.
             CAT III 150V.
             Calibration performed with supplied test leads.
             WHY "GROUNDING TEST" IS NECESSARY
             "Grounding" has a few different purposes, such as for safety and for the stability of the electrical circuits. Listed below is more info about it.
             1. Power system to the ground: As shown in figure, the purpose is preventing the secondary side from the damage of the primary side. It's necessary for user's safety.
             2. Equipment to the ground: Connect equipments or shells to the ground. The purpose is protecting the user from the leakage of the equipments.
             3. Electrical signal to the ground: Set up a "Zero volt" reference point or a loop path for all different signals. The purpose is for correct action or measuring.
             4. Grounding for shielding: Top prevent static electricity. To prevent noise, electromagnetic interference (put shielding). Shielding room, cable and communication wires to the ground, equipment's guard terminals to the ground, power transformers and filters to the ground.
            SPECIFICATIONS
             
            Measuring Ranges Earth Resistance : 0-10 Ohm/0-100 Ohm/0-1000 Ohm
            Earth Voltage : 0-30V AC (40-500Hz)
            Accuracy Earth Resistance : +/- 3% of full scale
            Earth Voltage : +/- 2.5% of full scale
            Measuring System Earth resistance by constant current inverter (Square Signal) 820 Hz approx. 2mA
            Open Circuit Indication LEDunit
            Power Source 1.5 V (AA) x 8
            Dimensions 170(L) x 165(W) x 92(D) mm
            Weight Approx. 1000g (battery included)
            Accessories Test leads (AL-36 : red-15m, yellow-10m, green-5m)
            Auxiliary earth spikes
            Simplified measurement probe
            Heavy-duty case
            Shoulder belt
            Instruction manual
            batteries
            特 點
            ● 吊線式高品質防震錶頭。
            ● 可量測接地電阻(Ω)和接地電壓(ACV)。
            ● 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。
            ● 電池電量指示。
            ● 使用電池操作。
            ● 請使用提供的測試線測試

            CAT III 150V
            規 格 (23°C±5°C <80%R.H.)
            量測檔位 接地電阻 : 0-10Ω/0-100Ω/0-1000Ω
            接地電壓 : 0-30V AC(40-500Hz)
            準確度 接地電阻 : ±3%滿刻度
            接地電壓 : ±2.5%滿刻度
            量測系統 820Hz 2mA 定電流
            接線正確(量測接地電阻) 紅燈(LED)會亮著
            外形尺寸 170(長)×165(寬)×92(高)mm
            重量 約1000公克(含電池)
            使用電池 1.5V(AA)×8(顆)
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