Sonel MRU-20 Operating Manual
  1. Manuals
  2. Brands
  3. Sonel Manuals
  4. Measuring Instruments
  5. MRU-20
  6. Operating manual

Sonel MRU-20 Operating Manual

Earth resistance meter
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MRU-20 and is the answer not in the manual?

Questions and answers

Related Manuals for Sonel MRU-20

Summary of Contents for Sonel MRU-20

  • Page 5 OPERATING MANUAL EARTH RESISTANCE METER MRU-20 SONEL SA ul. Wokulskiego 11 58-100 Świdnica Version 3.1 24/02/2017...
  • Page 6 The MRU-20 meter is a modern, easy and safe measuring device. Please acquaint yourself with the present manual in order to avoid measuring errors and prevent possible problems related to operation of the meter. OPERATING MANUAL MRU-20 version 3.1...

  • Page 7: Table Of Contents

    TECHNICAL DATA ................21 ....................21 ASIC DATA ................23 UPPLEMENTARY DATA 7.2.1 Measurement ..................23 7.2.2 Measurement of R ................24 CONT EQUIPMENT ................... 24 ................24 TANDARD QUIPMENT ................24 PTIONAL QUIPMENT MANUFACTURER ................... 26 OPERATING MANUAL MRU-20 version 3.1...
  • Page 8 OPERATING MANUAL MRU-20 version 3.1...

  • Page 9: Safety

     MRU-20 meter is designed to measure earth resistance and the resistance of protective conduc- tors and equipotential bondings. Any application that differs from those specified in the present manual may result in a damage to the device and constitute a source of danger for the user.

  • Page 10: Measurements

    The voltage electrode (driven into earth) should be connected to S socket of the meter. The earth electrode being tested should be connected to E socket of the meter. The earth electrode being tested and the current electrode and the voltage electrode should be located one line OPERATING MANUAL MRU-20 version 3.1...
  • Page 11 Carry out the measurement. Value of interference vol- tage. Read out main results: earth electrode resistan- ce R Auxiliary results may be read after pushing SEL push-button. resistance of current electrode resistance of voltage electrode OPERATING MANUAL MRU-20 version 3.1...
  • Page 12 In majority of cases the measurement accuracy achieved is satisfactory. However, you should always be aware of the uncertainty included in the measurement. - Calibration performed by the manufacturer takes into account the resistance of supplied measure- ment lead of 2.2 m OPERATING MANUAL MRU-20 version 3.1...

  • Page 13: Measurement Of Resistance Using Double-Pole Method

     is displayed instead of the result.) Acceptable temperature inside the meter is exceeded. Measurement of resistance using double-pole method, Turn on the meter. Set the rotational function se- lector at R 2p position. OPERATING MANUAL MRU-20 version 3.1...
  • Page 14 Value of interference vol- tage. Read out test results: The value of measured resistance. Note: - Calibration performed by the manufacturer takes into account the resistance of supplied measure- ment leads of 1.2 m and 2.2 m OPERATING MANUAL MRU-20 version 3.1...

  • Page 15: Measurement Of The Resistance Of Protective Conductors And Equipotential Bondings

    When carrying out measurements of very low resistance, or when using leads other than original (1.2 m and 2.2 m) the calibration of test leads must be performed. Turn on the meter. Set the rotational function se- lector at R 200mA posi- CONT tion. OPERATING MANUAL MRU-20 version 3.1...
  • Page 16 Read out the result. Note: - test current flows unidirectionally. To obtain results of a bidirectional current flow, the measurement should be repeated with replaced test leads and then respective arithmetic mean should be calculated from both measurements. OPERATING MANUAL MRU-20 version 3.1...

  • Page 17: Calibration Of Test Leads

    Turn on the meter. Set the rotational function se- lector at R ZERO posi- CONT tion. Short the test leads by putting crocodile clips on exposed ends of the test leads. Press START button. Perform Autozeroing. OPERATING MANUAL MRU-20 version 3.1...

  • Page 18: Switching-Off Autozeroing

    ZERO posi- CONT tion. Open out the test leads. Press START button. Autozeroing was turned off by the user. During measurements the meter will compensa- te the resistance of origi- nal test leads (1.2m and 2,2m.) OPERATING MANUAL MRU-20 version 3.1...
  • Page 19 Attention: It is sufficient to perform single compensation for the test leads. It is stored in memory even after turning off the meter. OPERATING MANUAL MRU-20 version 3.1...

  • Page 20: Power Supply Of The Meter

    Replacement of batteries (rechargeable batteries) MRU-20 Meter is powered by eight batteries or rechargeable batteries R6 (it is recommended to use alkaline batteries). Batteries (rechargeable batteries) are inserted into a container in the bottom part of the casing.
  • Page 21 Selected power supply: rechar- geable batteries. Pressing SEL push-button will change the power supply to batteries. Another pressing of the push-button will switch the selection again to rechargeable batteries. OPERATING MANUAL MRU-20 version 3.1...

  • Page 22: General Principles Regarding Using N I -Mh Rechargeable Batteries

    - The memory effect is limited in case of NiMH rechargeable batteries. These rechargeable batteries may be charged at any point with no serious consequences. However, it is recommended to dischar- ge them completely every few cycles. OPERATING MANUAL MRU-20 version 3.1...
  • Page 23 - Do not charge or use rechargeable batteries in extreme temperatures. Extreme temperatures reduce the lifetime of batteries and rechargeable batteries. Avoid locating devices powered by rechargeable batteries in very hot places. The nominal working temperature must be absolutely observed. OPERATING MANUAL MRU-20 version 3.1...

  • Page 24: Cleaning And Maintenance

    Waste Electrical and Electronic Equipment. Before the equipment is sent to a collection point, do not attempt to dismantle any elements. Observe the local regulations concerning disposal of packages, worn-out batteries and accumula- tors. OPERATING MANUAL MRU-20 version 3.1...

  • Page 25: Technical Data

    ądowej Rezystancj elektrody Current electrode resistance   Rezystancj uziemienia Earth resistance 0,0100 =0,3 0,0010 1000 10000 100000 Rezystancja elektrody napięciowej Rs[] Voltage electrode resistance Rs[] Influence of the resistance of electrodes on measurement uncertainty OPERATING MANUAL MRU-20 version 3.1...
  • Page 26 (above sea level) ....................... <2000m x) time of automatic switch-off ....................5 minutes y) electromagnetic compatibility ........according to EN 61000-6-3 and EN 61000-6-2 z) quality standard, execution, design and manufacturing are ISO 9001 compliant OPERATING MANUAL MRU-20 version 3.1...

  • Page 27: Supplementary Data

    , but ≤ Resistance of probes and From 0 to 100R the formula 50kΩ auxiliary earth electrodes defined in 7.2.1.1          Operational uncertainty where A = basic uncertainty OPERATING MANUAL MRU-20 version 3.1...

  • Page 28: Measurement Of R

    – WAPOZSZE2,  operating manual,  calibration certificate. 8.2 Optional Equipment Additionally, the following items not included in the scope of standard equipment may be purcha- sed from the manufacturer or the distributors: OPERATING MANUAL MRU-20 version 3.1...
  • Page 29 Test lead, 25m (blue) probe protective cover 80cm WAPRZ050YEBBSZ  Test lead 50m  cramp WAPOZSZP1 LSWPLMRU20  calibration certificate  reel for winding test leads WASONG80  earth contact test probe (rod) (80 cm) OPERATING MANUAL MRU-20 version 3.1...

  • Page 30: Manufacturer

    SONEL S.A. ul. Wokulskiego 11 58-100 Świdnica Poland tel. +48 74 858 38 60 fax +48 74 858 38 09 E-mail: export@sonel.pl Web page: www.sonel.pl Attention: Service repairs must be realized only by the manufacturer. OPERATING MANUAL MRU-20 version 3.1...

Table of Contents