ETCR Lightning Protection Standard Resistor
EM3900 Lightning Protection Specialized Standard Resistor
 | EM3900 Lightning Protection Specialized Standard Resistor Product Series : Lightning Protection Standard Resistor Main FeaturesUsed for calibrating instruments such as earth resistance testers and equipotential testers. Scales: 1mΩ, 10mΩ, 100mΩ, 1Ω, 10Ω, 100Ω, 1kΩ, 100kΩ (8 ranges) Range: 10⁻³ ~ 10⁵Ω Accuracy: 0.05% Power: 1/2W Resistor: High-precision wirewound resistor |
The EM3900 Lightning Protection Specialized Standard Resistor consists of nine 1/2W high-precision wirewound resistors. Calibration allows for direct switching and testing without changing test leads. Its stable performance and robust construction make calibration test particularly convenient. The high-precision wirewound resistors feature a maximum accuracy of 0.05%. Available resistance values include 1mΩ, 10mΩ, 100mΩ, 1Ω, 10Ω, 100Ω, 1kΩ, and 100kΩ, fully meeting the 10⁻³ ~ 10⁵Ω range specified in National Meteorological Administration Order No. 38, “Administrative Measures for the Qualification and Inspection of Lightning Protection Devices.” This standard resistor is primarily used for calibrating instruments such as earth resistance testers and equipotential testers. It is widely used in building quality inspection stations, supervision companies, construction companies, lightning protection companies, and power companies.
ETCRMETER is a high-end brand of ETCR. All products are manufactured by ETCR, which also provides technical support and after-sales service.
Product Features
1. Made of high-precision winding resistors, it has stable performance and strong structure, and is particularly convenient for calibration.
2. Fully meetss the national weather service order “Lightning Protection Device Detection Qualification Management Approach” specified in the range of 10-3 ~ 105 Ω.
3. Eight output levels: 1mΩ, 10mΩ, 100mΩ, 1Ω, 10Ω, 100Ω, 1kΩ, 100kΩ.
Technical Parameters
| Specification Name | Parameters Description |
| Functions | Used for calibrating instruments such as earth resistance testers and equipotential testers |
| Wiring Method | Four-wire method |
| Range & Accuracy | 0.001Ω; 2% |
| 0.01Ω; 0.5% | |
| 0.1Ω; 0.2% | |
| 1.0Ω; 0.2% | |
| 10Ω; 0.05% | |
| 100Ω; 0.05% | |
| 1kΩ; 0.05% | |
| 10kΩ; 0.05% | |
| 100kΩ; 0.05% | |
| Power | 1 / 2W |
| Temperature Coefficient | ± 25ppm |
| Test Line | Red(0.5m)*2pcs,Black(0.5m)*2pcs |
| Dimensions | 173mm x 125mm x 70mm |
| Weight | Host: approx. 345g; Total weight: approx. 1.32kg (include accessories) |
| Insulation Resistance | Above 10MΩ (500V between the circuit and the housing) |
| Withstand Voltage | AC 3700V/rms (between circuit and housing) |
| Working Temperature & Humidity | -10℃～40℃; below 70%RH |
| Storage Temperature & Humidity | -20℃～60℃; below 80%RH |
| Safety Standard | IEC61010-1, CAT Ⅲ600V, pollution level, JJG166-1993 {DC resistor verification procedures} |
Model Comparison
Commonly Used Instruments in Lightning Protection Industry
| Product Name | Model | Main Parameters |
| Clamp-on Earth Resistance Tester | EM2000+ | Measuring Range: 0 ~ 1000Ω, Resolution: 0.01Ω |
| Digital Earth Resistance Tester | EM3040 | Test current: > 20mA (sine wave), Resolution: 0.01Ω |
| Earth Grid Tester | EM3300B | Test current: > 3A, Resolution: 0.001 ~ 99.999Ω, Selectable frequency |
| Soil Resistivity Tester | EM3040B | 4-wire measurement, Test current: > 20mA (sine wave), Resolution: 0.01Ω |
| Equipotential Tester | EM3700 | Test current: > 1A, 4-wire test, Resolution: 0.001Ω, Equipped with large-capacity lithium battery |
| Loop Resistance Tester | EM2150 | Resistance measurement resolution: 0.001Ω, Current measurement resolution: 1uA |
| Lightning Protection Component Tester | EM3800 | Test component: MOV, Equipped with large-capacity lithium battery |
| Insulation Resistance Tester | EM3460A | 0 ~ 1000MΩ |
| Surface Resistance Tester | EM3420 | Measuring range: 10³ ~ 10¹⁰Ω |
| Digital Multimeter | EM5930 | Voltage, current, resistance measurement, Resolution: 3.5 digits |
| Standard Resistor | EM3900 | 10⁻³ ~ 10⁵Ω, Power: 1/2w, Wire-wound type |
