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Click to Download:MEWOI3900 Online Earth Resistance Tester User Manual
INTRODUCTION
MEWOI3900 Contact Grounding Resistance Online Tester is used to monitor grounding resistance, equipotential connection resistance and grounding voltage of grounding system. The range of resistance is 0.01_~2000_, and the range of voltage is AC 0~600V. The grounding resistance is measured by precise three-wire method or simple two-wire method. The grounding voltage is measured by average rectification method. On-line detection and real-time monitoring are carried out. Users can choose RS232 or RS485 to communicate. According to the MODBUS communication protocol, users can redevelop, build a network, and realize remote multi-point online monitoring. MEWOI3900 grounding resistance online tester is composed of tester, monitoring software and so on. The tester is very intuitive with super large LCD display. It can set alarm critical value through its keys, and has sound and light alarm indication. The shell material has the characteristics of high and low temperature resistance, anti-corrosion, flame retardant and so on, which ensures the accuracy, stability and reliability of long-time on-line monitoring in the field, underground mine and indoor. The software can display the measured grounding resistance and grounding voltage in real time. It can automatically monitor and record the interval time through the detector or software. The interval time range is 1-999 hours. The data stored by the software can be automatically recorded to generate reports, which are convenient to save, save historical data, print and analyze. |
MAIN FEATURES
| 1,Range：Ground Resistance：0.01Ω-2000Ω；Ground voltage：AC 0～600V |
| 2,Ground Resistance on-line monitoring |
| 3,Measure equipotential bonding resistance |
| 4,Measure Low value resistor |
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℃~40℃; below 80%rh. | ||
Storage Humiture | - -20℃~60℃; 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. | ||
| Accessories | Meter*1,Power and Communication Cable*1,Aluminum Mounting Parts, Manual | ||
