Product Name: Hm2000b Double Clamp Digital Phase Meter Model NO.: HM2000B Power Source: Single 9V Laminated Battery Weight: 280g Control: Manual Control Display: Digital Load Way: Electronic Load Type: Material Testing Machine Sampling Rate: 3 Times Per Second Clamp Shell: 140*42*20mm Measuring Clamp: 2*200g Relative Humidity: (20-80)% Frequency of Measured Signal: (50+-0.5)Hz Trademark: GDHM Transport Package: Wooden Box with Foam Inside Specification: 192x95x55mm Origin: Hubei, China(Mainland) Product Description Product DescriptionHM2000B Double Clamp Digital Phase Meter is specially designed for measuring voltage, current and phase. It is characterized by high precision, low price, portable hand-held and dual-channel input measuring. It's easy to measure the phase between U-U, I-I and U-I, identify the inductive/capacitive circuit and the phase sequence of three-phase voltage, check the wiring group of transformer, test the secondary circuit and busbar differential protection system, display the phase relationship among the CT groups of a differential protection system, and check if the wire of electric meter is correctly connected. Under test, you do not need cut off the tested current which is inputted by clamp-current transformer. When measuring the phase between U1 and U2, the two input circuit loops are completely isolated, so it can completely avoid short circuit and burning down the meter caused by misconnection. The display of this device is high-contrast LCD screen, and the character in which could be as high as 25mm, and can be freely rotated approximately 70 ° to obtain the best visual effects.The shell of the device is made of engineering insulating material, together with a rubber anti-vibration protection casing for safety and reliability.Intrinsic Error1.Operating Conditions1) Temperature:(23±5)ºC2) Relative humidity:(45~75)%3) Wave forms of measured signal: Sine wave, β=0.024) Frequency of measured signal: 50±0.2)Hz5) Position of Measured current carrying conductor in clamp jaw: Optional position6) Amplitude range of measured signal when measuring phase: 100~220V, 0.5A~1.5A7) External reference frequency electromagnetic interference: Should be avoided2. Limits of Intrinsic Error1) AC Voltage(see Table 1)Table 1:Error of AC VoltageMeasure rangeResolutionLimits of intrinsic error20V0.01V±(1.2%RD+2)200V0.1V±(1.0%RD+2)500V1V±(1.2%RD+2)Input Impedance:All measure rangesinput 2MΩ2)ACcurrent(see Table 2)Table 2:Error of ACcurrentMeasure rangeResolutionLimits of intrinsic error200mA0.1mA±(1.0%RD+2)2A1mA10A10mA3) PhaseU-U,U-I,I-I(see Table 3)Table 3: Error of Power-frequency PhaseRangeResolutionLimits of intrinsic error0~360°1°±3°Loopimpedance of input voltagewhen measuring phaseU1-U2:40KΩOperating Error1.Rated Operating Conditions1) Temperature:(0~40)ºC2) Relative humidity:(20~80)%3) Wave forms of measured signal: Sine wave, β=0.054) Frequency of measured signal:(50±0.5)Hz5) Position of Measured current carrying conductorin clampjaw: optional position.6) Amplitude range of measured signal when measuring phase:Phase U1-U2: 30V~500VPhase I1-I2: 10mA~10.00APhase U1-I2 or I1-U2: 10V~500V,10mA~10.00A7) External reference frequency electromagnetic interference: Should be avoided2. Limits of Rated Operating ErrorInitem 1 Rated Operating Conditions, the limits of rated operating error should not more than twice limits of intrinsic error.Other Technical Specifications1. Display: three and halfbits2. Sampling Rate: 3 times per second3. Power Supply: single 9V laminated battery, supply current is less than 5mA4. DimensionsMeter shell: 192x95x55mmClampshell: 140×42×20mmClampjaw: Φ7×9mm5. WeightMeter body: 280gMeasuring clamp: 2×200g6. Storage ConditionsTemperature: -10ºC~50ºC