เครื่องวัดความต้านทานดิน Kyoritsu 4200

Earth Clamp Tester4200 Product CatalogueInstruction Manual •The earth resistance from 0.05 to 1200Ω can be measured without the auxiliary earth spikes.(The Multiple Earthing System.)•True RMSAccurate true RMS readings of AC current including distorted waveform from 1mA to 30.0A•Noise Check Function A function to detect current, which effects on an earth resistance measurement and display "NOISE" mark on the LCD.•Memory function Save and display up to 100 measurement data.•Data hold function / Buzzer function / Back light function•Compliant with Safety Standards of IEC 61010-1 : CAT.IV 300V Pollution degree2Note:A single earthing can not be measured. (Only for Multiple Earthing System) FunctionRangeResolutionMeasuring rangeAccuracyEarth resistance Auto range20Ω0.01Ω*0.00~20.99Ω|±1.5%±0.05Ω200Ω0.1Ω16.0~99.9Ω|±2%±0.5Ω100.0~209.9Ω|±3%±2Ω1200Ω1Ω160~399Ω|±5%±5Ω400~599Ω|±10%±10Ω10Ω600~1260Ω---AC current(50Hz / 60Hz)Auto range100mA0.1mA0.0~104.9mA|±2%±0.7mA1000mA1mA80~1049mA|±2%10A0.01A0.80~10.49A30A0.1A8.0~31.5AOperating systemEarth resistance function :Constant voltage injection,Current detection, (Frequency : Approx.2400Hz)Dual IntegrationAC current function :Successive ApproximationOver-range indication"OL" is displayed when input exceeds the upper limit of a measuring rangeResponse timeApprox.7 seconds (Earth resistance)Approx.2 seconds (AC current)Sample rateApprox. 1 times per secondPower sourceDC6V : R6P (sizeAA manganese battery) × 4pcs,or LR6 (sizeAA alkaline battery) × 4pcsCurrent consumptionApprox. 50mA (max. 100mA)Measurement timeApprox. 12 hours (when R6P is used)Approx. 24 hours (when LR6 is used)Auto power-offTurns power off about 10 minutes after the last button operation.Applicable standardsIEC 61010-1 : 2001 (CAT.IV 300V Pollution degree2)Withstand voltageAC5320Vrms / 5 secondsBetween the Transformer jaws fitted parts and Case enclosure(except for jaws)Conductor sizeApprox. 32mm max.Dimension246(L) × 120(W) × 54(D)mmWeightApprox. 780g (including batteries)AccessoriesBattery R6P : 4pcs Instruction manual : 1pc8304 (Resister for operation check : 1pc)9128 (Hard case : 1pc)•Crest factor < 3 (50Hz / 60Hz, peak value shall not exceed 60A)*4 counts or less are corrected to 0. Why earth resistance can be found by only clamping it?Rx, is defined as earth resistance under test, and R1, R2...Rn are defined as earth resistance of other measuring objects.These earth resistances, R1, R2, Rn can be considered that they are connected in parallel.And they can be regarded as a combined resistance Rs. The Rs can be regarded small enough against Rx since a combined resistance consists of several resistances. Following is an equivalent circuit diagram of this circuit.Voltage V is applied to the object (Resistance Rx) measured from the voltage injection transformer CT1, and the current I corresponding to the earth resistance is flowed.The current I is detected with detection transformer CT2, and object (Resistance Rx) measured can be put out by the calculation. (refer to the right diagram)