Máy đo điện trở đất và điện trở suất Sonel MRU-120

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 R  and R , S H

- 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) or feet (ft)

- memory of 990 measurement results (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: Máy đo điện trở đất và điện trở suất Sonel MRU-120

• singnalling  overvoltage 24V or 40V rms

• measurement for DC and AC 45…65 Hz,

Measurement of continuity of equipotential bondings and protective

conductors (R ) measurement range to IEC61557-5: 0,24Ω...19,9kΩ cont

• 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 earthing resistance (method 3- and 4-pole)

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

• measurement current: under short circuit >200mA,

• voltage on open terminals: selectable <25V AC or <50V AC,

• frequency of measurement current: 125 (for networks 50Hz)

  or 150Hz (for 60Hz),

Measurement of resistance of auxiliary electrodes R _H and R_S       

Measurement of multiple earthing resistance with using the clamp and auxiliary

electrodes (3p + clamp)

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

• voltage on open terminals: selectable <25V AC or <50V AC,

• 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

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

  or 150Hz (for networks 60Hz)

Measurement of ground resistivity 

Measurement method: Wenner, ρ=2πLR_E

L – distance between probes: 1...50m