• Gossen Metrawatt
  • Gossen
  • Camille Bauer


Thank you

Item number: M550S


Compact and rugged - for laboratory use, field use, or service calls under harsh conditions
  • m550s-metrisoxtra-front-14090.jpg

The METRISO XTRA insulation and resistance measuring instruments allow for quick and effective testing of protective measures in accordance with:

  • DIN VDE 0100
  • ÖVE-EN 1 (Austria)
  • SEV 1000 (Switzerland)
  • and regulations specific to other countries as well

Insulation measurement per EN 61557-2 / VDE 0413 part 2

Low-resistance measurement per EN 61557-4 / VDE 0413 part 4

Voltage testing and measurement up to 1000V

Product Highlights

  • Test voltages in fixed increments, variable or as a ramp 50, 100, 250, 500, 1000 V
  • Polarization index (PI) and dielelectric absorption ratio (DAR) 
  • Intelligent filter - precise and measurement-dependent activation for the measurement of very high resistances - beating, i. e. compensation of 16 2/3 Hz and 50 Hz interference - attenuation of capacitive influences from power cables, etc. - suppression of electric field influences
  • Signalling of dangerous contact voltage
  • Acoustic signalling when limit value is exceeded
  • Detection of interference voltage in switch position OFF
  • Overvoltage protection - protects the instrument in the event of inadvertent connection to mains power
  • Fuse link for all resistance measuring ranges
  • New: Electronic fuse for protection of the low-resistance measurement RLO also protects the fuse link in the low-resistance measuring range in the event of faulty operation
  • One measuring point self-test with test resistance of 10 MΩ per EN 50110 / VDE 0105-100
  • Backlit dot matrix display for measured and limit values
  • Timer function 1 s ... 100 min
  • Guard terminal for compensating surface current


  • PI, DAR Polarization index measurements
  • Riso Vvariable = 50 ... 1000V (Limit value 1 MΩ)
  • Riso VRamp = 50 ... 1000V Display of breakdown voltage
  • Measuring ranges
  • Riso 10 k ...1 TΩ
  • Riso V = 50, 100, 250, 500 / 1000V
  • R 10 Ω... 10 kΩ
  • RLO 0,01 ... 10 Ω
  • V 0 ... 500 / 1000V

Display functions

  • Backlit display
  • Limit value LED Limit (green/red)
  • Additional acoustic signal, limit value per VDE 0100 Riso
  • RLO LED for dangerous contact voltage (when switched off)
  • LCD symbol for external voltage
  • Battery level display
  • Special functions
  • Data storage in the instrument, 50.000 objects
  • Discharge capacitive devices under test
  • Safety shutdown (VBatt < 8 V)


  • Charging socket, RS232 and USB interface
  • Measuring categories CAT II 1000V, CAT III 600V
  • Measuring category CAT III 600V, CAT IV 300V
  • Integrated 10 MΩ test resistor
  • DAkkS calibriation certificate


The insulation measuring instruments are suitable for the following tasks:

  • Measurement of insulation resistance at voltage-free devices and systems, up to 1000V
  • Testing of the resistance of earthing conductors, protective conductors and equipotential bonding
  • Checking of test objects for absence of voltage
  • Testing of electrostatic discharge capacity at floor coverings (using shielded measurement cables) - EN 1081
  • With the 1 mA test per DIN VDE 0845/EN 61645, the instrument also allows to perform on-site tests of the response voltage of overvoltage components (varistors, Zener diodes, etc.) of requirement categories B and C / SPD Type 2 and 3) and to evaluate the test results in accordance with manufacturer‘s data.


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