Sonel MRU-120 接地电阻/电阻率计(3p,4p,钳位)

- Measurement of interference voltage
+ 0...100 V/ 1 V /±(2% m.v + 3 digits)
- Range Measurement of earth resistance (method 3- and 4-pole) 
+ 0,00...19,99 Ω/ 0,01 Ω /±(2% m.v. + 2 digits)
+ 20,0...199,9 Ω/ 0,1 Ω /±(2% m.v. + 2 digits)
+ 2,0k...9,99 kΩ/ 0,01 kΩ /±(5% m.v. + 2 digits)
+ 10,0k...19,9 kΩ/ 0,1 kΩ /±(5% m.v. + 2 digits)
- Measurement of resistance of auxiliary electrodes RH and RS
+ 0...999 Ω/ 1 Ω /±(5% (RS+RE+RH) + 8 digits)
+ 1,00k...9,99 kΩ/ 0,01 kΩ /±(5% (RS+RE+RH) + 8 digits)
+ 10,0k...19,9 kΩ/ 0,1 kΩ /±(5% (RS+RE+RH) + 8 digits)
- Measurement of multiple earth resistance with using the clamp and auxiliary electrodes (3p + clamp) (option clamp)
+ 0,00...19,99 Ω/ 0,01 Ω /±(8% m.v. + 3 cyfry)
+ 20,0...199,9 Ω/0,1 Ω /±(8% m.v. + 3 cyfry)
+ 200...1999 Ω/1 Ω /±(8% m.v. + 3 cyfry)
- Measurement of multiple earth resistance with using double clamps (option clamp)
+ 0,00..19,99 Ω/ 0,01 Ω /±(10% m.v. + 3 digits)
+ 20,0...149,9 Ω / 0,1 Ω /±(20% m.v. + 3 digits)
- Measurement of ground resistivity 
+ 0,0...199,9 Ωm /0,1 Ωm     
+ 200...1999 Ωm /1 Ωm 
+ 2,00k...19,99 kΩm /0,01 kΩm 
+ 20,0k...99,9 kΩm /0,1 kΩm 
+ 100k...999 kΩm /1 kΩm

Detail

 MRU-120 Technical Specifications

 

Possible measurements:

  • earth resistance measurment with 3-pole,4-pole method,
  • earth resistance measurement without disconnecting measured earths (using clamp),
  • continuity of equipotential bondings and protecting conductors
  • two clamps earth resistance measurement without auxiliary test probs,
  • earth resistivity measurement,

 It allows to take the measurements of: 

  • earthing resistance using auxiliary electrodes,
  • earthing resistance using auxiliary electrodes and clamp (for measurements of multiple earthing)
  • earthing resistance using double clamps (for measurement of earthing when it is impossible to use auxiliary electrodes),
  • ground resistivity (Wenner method),
  • measurement of continuity of equipotential bondings and protective conductors (meeting the requirements of IEC 60364-6-61:2000 section 6.12.2) with auto-zero function – with current 200mA.

Additionally:

  • measurement of resistance of auxiliary electrodes RS and RH,
  • measurement of interference voltage,
  • measurement of interference frequency,
  • measurement in the presence of interference voltage in the power network with frequency 50Hz, 60Hz
  • selection of maximum measuring voltage (25V and 50V)
  • introducing the distance between the electrodes for the resistivity in metres (m),
  • memory of 990 measurements (10 banks of 99 cells each),
  • calibration of clamp used,
  • real time clock (RTC),
  • data transmission to the computer (USB, wireless),
  • indication of battery state.
Electric security:
- type of insulation: double, according to  EN 61010-1 and IEC 61557
- measurement category: CAT IV 300V acc. to EN 61010-1
- protection class acc. to EN 60529: IP54

Rated operational conditions:

- operation temperature: -10...+50°C
- storage temperature: -20...+70°C
- humidity: 20...80%

Other technical data:

- LCD display: graphic, backlighted 
- interface: USB, wireless
- number of measurements carried out of set of batteries: > 500
- warranty: 36 months

 

Measurement of interference voltage

Range Resolution Accuracy
0...100V 1V ±(2% m.v + 3 digits)

• singnalling  overvoltage 24V or 40V rms
• measurement for DC and AC 45…65 Hz,


Measurement of earthing resistance (method 3- and 4-pole) 

measurement range to IEC61557-5: 0,30Ω...19,9kΩ

 

Range Resolution Accuracy
0,00...19,99Ω 0,01Ω
±(2% m.v. + 2 digits)
20,0...199,9Ω 0,1Ω
200...1999Ω
2,0k...9,99kΩ 0,01kΩ  ±(5% m.v. + 4 digits)
10,0k...19,9kΩ 0,1kΩ

 

• measurement current: under short circuit >200mA, 
• voltage on open terminals: selectable <25v ac="" or="" 50v="" ac="" br=""> • frequency of measurement current: 125 (for networks 50Hz) or 150Hz (for 60Hz),
 
Measurement of continuity of equipotential bondings and protective conductors (Rcont)
measurement range to IEC61557-5: 0,24Ω...19,9kΩ

 

Range Resolution Accuracy
0,00...19,99Ω 0,01Ω
±(2%  m.v. + 2 digits)
20,0...199,9Ω 0,1Ω
200...1999Ω
2,0k...9,99kΩ 0,01kΩ  ±(5%  m.v. + 2 digits)
10,0k...19,9kΩ 0,1kΩ

 

•voltage on open terminals: <24vrms but="">4Vrms,
• measurement current: under short circuit >200mA,
• frequency of measurement current: 125 (for networks 50Hz)  
  or 150Hz (for networks 60Hz), possible choice of measurement frequency in menu,
• auto-zero function measurement leads

Measurement of resistance of auxiliary electrodes RH and RS

 

Range Resolution Accuracy
0...999Ω
±(5% (RS+RE+RH) + 8 digits)
1,00k...9,99kΩ 0,01kΩ
10,0k...19,9kΩ 0,1kΩ

 


Measurement of multiple earthing resistance with using the clamp and auxiliary electrodes (3p + clamp) 

measurement range to IEC61557-5: 0,44Ω...1999Ω 

 

Range Resolution Accuracy
0,00...19,99Ω 0,01Ω
±(8% m.v. + 3 cyfry)
20,0...199,9Ω 0,1Ω
200...1999Ω

 

• voltage on open terminals: selectable <25v ac="" or="" 50v="" ac="" br=""> • measurement current: under short circuit > 200mA,
• frequency of measurement current: 125 (for networks 50Hz) 
  or 150Hz (for 60Hz),


Measurement of multiple earthing resistance with using double clamps

 

Range Resolution Accuracy
0,00..19,99Ω 0,01Ω ±(10% m.v. + 3 digits)
20,0...149,9Ω 0,1Ω ±(20% m.v. + 3 digits)

 

• frequency of measurement current 125 (for networks 50Hz) 
  or 150Hz (for networks 60Hz)


Measurement of ground resistivity 
Measurement method: Wennera, ρ=2πLRE

 

Range Resolution Accuracy
0,0...199,9Ωm 0,1Ωm depending on measurement 
accuracy RE with 4p method, 
but not less than ±1 digit
200...1999Ωm 1Ωm
2,00k...19,99kΩm 0,01kΩm
20,0k...99,9kΩm 0,1kΩm
100k...999kΩm 1kΩm

 

L – distance between probes: 1...50m

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