• Gossen Metrawatt
  • Gossen
  • Camille Bauer


Thank you

Item number: M550R

Analog Test Instrument for Insulation, Low-resistance and Voltage Measurements

Compact and rugged - for service calls under harsh conditions and laboratory use
  • m550r-metrisopro-front-14085.jpg

The METRISO G1000A 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 1000 V

Product Highlights

  • Analog display of measured values and limit values
  • 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 by means of LED
  • Indication of limit value violations by means of LED
  • Overvoltage protection - protects the instrument in the event of inadvertent connection to mains power
  • Fuse link for all resistance measuring ranges
  • 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
  • Guard terminal for compensating surface current

Measurements analog

  • Measuring ranges Riso 10K to 1TΩ
  • Riso U = 50, 100, 250, 500 / 1000V RLO .01 to 10 Ω 
  • V 0 to 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

  • Discharge capacitive devices under test
  • Safety shutdown (V Batt < 8 V)


  • Measuring categories CAT II 1000V, CAT III 600V
  • Measuring category CAT III 600V, CAT IV 300V
  • Integrated 10 MΩ test resistor
  • DAkkS calibriation certificate (ISO 17025) 
  • Proprietary certificate


The insulation measuring instruments are suitable for the following tasks:

  • Measurement of insulation resistance at voltage-free devices and systems, up to 1000 V
  • Checking of test objects for absence of voltage in systems with up to 1 KV
  • Testing of the resistance of earthing conductors, protective conductors and equipotential bonding
  • Testing of electrostatic discharge capacity at floor coverings (using shielded measurement cables) - EN 1081
  • With the help of the so-called 1 mA test per DIN VDE 0845/ EN 61645, testing for the triggering of performance category B and C / SPD type 2 and 3 surge protection devices (varistors, reference diodes etc.) can be executed with this measuring instrument, on-site as well, and evaluated in accordance with the manufacturer’s data.

Discharging Capacitive Devices Under Test

Capacitive devices under test such as cables and coils, which may be charged with test voltage, are discharged by the measuring instrument. The falling voltage value can be observed at the display.


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