MRU-30 - Measuring equipment Sonel - Free user manual and instructions
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| Product Type | Earth Resistance Tester |
| Model | MRU-30 |
| Brand | Sonel |
| Dimensions | 220 x 100 x 60 mm |
| Weight | 0.7 kg (with batteries) |
| Power Supply | 4 x AA alkaline batteries (6 V) |
| Display | LCD, 3 1/2 digits |
| Measurement Functions | Earth resistance, soil resistivity, resistance to ground with clamp, DC voltage |
| Earth Resistance Range | 0.01 Ω to 20 kΩ |
| Accuracy | ±2% of reading ±3 digits |
| Test Frequency | 128 Hz |
| Safety Standards | IEC 61557, IEC 61010-1, CAT III 600 V |
| Memory | Stores up to 99 measurements |
| Interface | RS-232 (optional adapter) |
| Protection Class | IP54 |
| Operating Temperature | -10°C to +50°C |
| Storage Temperature | -20°C to +60°C |
| Humidity | 20% to 80% RH (non-condensing) |
| Accessories Included | Test leads, 2 x ground spikes, carrying case, manual |
| Maintenance | Clean with damp cloth; calibrate annually |
| Spare Parts / Repairability | Replaceable batteries, fuses; service by qualified technician |
Frequently Asked Questions - MRU-30 Sonel
How do I measure earth resistance with the MRU-30?
Connect the test leads (E, S, H) to the ground system and spikes. Select the appropriate range using the rotary switch. Press the START button. The LCD displays the resistance value in ohms.
What type of battery does the MRU-30 use?
It uses four AA alkaline batteries (1.5 V each). When the battery icon blinks, replace them.
Can the MRU-30 measure soil resistivity?
Yes, using the Wenner method. Place four spikes in a line at equal distances (a). Connect leads, select resistivity mode. The device calculates ρ = 2πaR.
How to calibrate the MRU-30?
Calibration should be done annually by an accredited laboratory. The device has internal reference resistors for self-check.
What does the 'noise' symbol mean?
It indicates excessive interference voltage (>3 V) on the measured object. Ground the system or reduce noise sources.
Can I use the MRU-30 to test lightning protection?
Yes, it measures earth resistance of lightning rods. Ensure the rod is disconnected from the system for accurate readings.
How to store the device when not in use?
Remove batteries if storing >3 months. Keep in a dry, clean place between -20°C to +60°C.
What is the accuracy of the MRU-30?
Accuracy is ±2% of reading ±3 digits for most ranges. Refer to manual for specific ranges.
How to transfer data to a PC?
Use the optional RS-232 cable and software (Sonel Reader). Connect to device, download stored measurements.
What does error code 'E1' mean?
E1 indicates open circuit in test leads. Check connections; ensure spikes are properly inserted.
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USER MANUAL MRU-30 Sonel
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Product information
Brand : Sonel
Model : MRU-30
Category : Measuring equipment