1.ETCR2900 Online Earth Resistance Tester is our company devotes ourselves to Grounding resistance test technical research’s another new high-tech product for more than ten years. Adopting precise 3-wire or simple 2-wire method for ground resistance measurement, average value rectification method for ground voltage measurement online testing and real-time monitoring. The user can select RS232 or RS485 communication, according to the protocol MODBUS, the user also can proceed secondary development, build network, realization of remote multipoint online monitoring etc. 

   2.ETCR2900 Online Earth Resistance Tester composed of the detector and the monitoring software. The large LCD display of the detector is very intuitive. Setting the alarm thresholds and audible and visible alarm indicator are available. The material of the shell has the characteristic of resistance to high low temperature, corrosion prevention, inflaming retarding etc, ensure high-accuracy, high stability and high reliability of long time on-line monitoring outdoors, underground mine and indoors. The monitor software can real-time display the values of measured ground resistance and voltage. The user also can set the automatic monitoring interval time by the detector or the monitor software, the range of interval time is 1-999 hours. The automatic recording data can be generated reports, it is convenient to preservation, historical data query, print, analysis. 

   3.ETCR2900 Online Earth Resistance Tester apply to transmission line tower grounding, underground mine equipment grounding, meteorological lightning proof grounding, petrochemical grounding, communication grounding, distribution substation grounding, railway equipment grounding, building warehouse grounding, electrical equipment grounding etc. 

   II. Technical Specification 

                     Function     

               On-line monitoring ground resistance, ground voltage, equipotential connection resistance, low resistance.     

                     Power Supply     

               Standard: 12V±1VDC, 150mA Max.     

           Optional: 24V±1VDC.     

               Range     

               Accuracy     

               Resolution     

                     Resistance     

               0.01Ω~20Ω     

               ±1%rdg±3dgt     

           (auxiliary ground resistance 100Ω±5%, voltage to ground<10V)     

               0.01Ω     

                     0.1Ω~200Ω     

               0.1Ω     

                     1Ω~2000Ω     

               1Ω     

                     Voltage     

               0~600V AC     

               ±1%rdg±3dgt     

               1V     

                     Measure Mode     

               Precise 3-wire measurement, simple 2-wire measurement.     

                     Measure Method     

               Ground resistance: rated current change-pole method, measured current 3mA Max, 820Hz;     

           Voltage to ground: average value rectification method.     

                     Data Mode     

               Mean.     

                     Display Mode     

               4-digital super-large LCD.     

                     Measuring Indicator     

               During measurement, LCD count down display.     

                     LCD Size     

               128mm×75mm;     

           Display field: 124mm×67mm.     

                     Dimension     

               L×W×H: 190mm×117mm×54mm.     

                     Measure Rate     

               Voltage to ground: about 2 times/second; ground resistance: about 30 seconds/time.     

                     Measure Times     

               Over 5000 times(Measuring 10Ω for one time and take a pause for 30s).     

                     Line Voltage     

               Measuring voltage to ground: measuring below AC 600V.     

                     Instrument Interface     

               Pluggable terminal blocks: 9 pin connector.     

                     Communication Method     

               RS485 (or optional RS232).     

                     Communication Line     

               USB to RS485 communication line( or optionalUSB to RS232 communication line).     

                     Range Shift     

               Automatically.     

                     Data Storage     

               400 sets, flash display FULL icon to indicate storage is full.     

                     Interval Time     

               Range of automatic monitoring interval time: 1-999 h.     

                     Data Access     

               Data read function: READ icon display.     

                     Overflow Display     

               Exceeding measuring range overflow function: OL icon display.     

                     Power Consumption     

               Backlit : 20mA Max.     

                     Standby: 25mA Max.     

                     Measurement: 70mA Max.     

                     Alarm     

               Audible and visible alarm.     

                     Power supply Voltage     

               When power supply voltage decreases to about 7.8V, will display, reminding to replace the power.     

                     Weight     

               Detector: 450g.     

                     Working Humiture     

               -10°C~40°C; below 80%rh.     

                     Storage Humiture     

               - -20°C~60°C; below 70%rh.     

                     Overload Protection     

               Measurement ground resistance: E-P, E-C between each interfaces AC 280V/3 sec.     

                     Insulation Value     

               Over 10MΩ(between circuit and enclosure 500V).     

                     Withstand Voltage     

               AC 3700V/rms. (Between circuit and enclosure).     

                     Electromagnetism     

               IEC61010-4-3,Radio frequency electromagnetic field≤1V/m.     

                     Applicable Safety Rules     

               IEC61010-1, IEC1010-2-31, IEC61557-1,5, IEC60529(IP54), Pollution degree 2, CAT III 300V.     

   The batteries not included package