High-precision insulation, low-resistance and voltage measuring device - with memory. Compact and robust for rough service applications and laboratory operation. With the METRISO XTRA insulation and low-resistance measuring devices you can quickly and efficiently test protective measures for electrical systems in accordance with:DIN VDE 0100ÖVE-EN 1 (Austria)NIV / NIN SEV 1000 (Switzerland) and other country-specific regulationsInsulation measurement in accordance with EN 61557-2 / VDE 0413 Part 2Low-resistance measurement in accordance with EN 61557-4 / VDE 0413 Part 4Voltage measurement up to 1000 V. The insulation measuring devices are suitable for the following tasks:Measuring the insulation resistance of voltage-free devices and systems up to 1000 VChecking the resistance of earthing, protective and equipotential bonding conductorsChecking test objects to ensure they are free of voltageTesting the conductivity of floor coverings with regard to electrostatic charges (when using shielded measuring cables) - EN 1081With the so-called 1 mA test in accordance with. DIN VDE 0845 / EN 61645, this measuring device can also be used to test the response voltage of overvoltage components (varistors, zener diodes, etc.) of requirement categories B and C / SPD type 2 and 3) on site and to evaluate them according to the manufacturer's data. Test voltages in fixed steps, variable or as a ramp 50, 100, 250, 500, 1000 VPolarization index and absorption ratioIntelligent filter - measurement-dependent and precise connection when measuring high-impedance resistors in the case of: - beats, i.e. compensation of 16 2/3 Hz and 50 Hz interference - damping of capacitive influences, e.g. supply lines - suppression of electrical field influencesSignaling of dangerous contact voltageAcoustic signaling when limit values are exceededExternal voltage detection in switch position OFFOvervoltage protection - protects the instrument if accidentally connected to Mains voltageFuse for all resistance measuring rangesNew: Electronic fuse to protect the low-ohm and resistance measurements RLO and RDevice self-test with built-in test resistor 10 M¿ in accordance with EN 50110 / VDE 0105-100 Backlit dot matrix display for measurement and limit valuesTimer function 1 s ... 100 minGuard connection to compensate for surface currentsMETRISO XTRA article number M550S Measurements PI, DAR Polarization index measurement Riso Uvariable = 50 ... 1000 V (limit value 1 M¿) Riso URamp = 50 ... 1000 V Display of the. Breakdown voltage measuring ranges Riso 10 k...1 T¿ Riso U = 50, 100, 250, 500 / 1000 VR 10 ¿... 10 k¿RLO 0.01 ... 10 ¿ U 0 ... 500 / 1000 V Display functions Backlit display Limit LED (green/red) for: additional acoustic signaling, limit values according to VDE 0100 Riso, RLO LED for dangerous contact voltage (when switched off) LCD symbol for external voltage Battery status display Special functions Data storage, max. 50,000 objects Discharging capacitive test objects Safety shutdown (UBatt < 8 V) Equipment Charging socket,RS232+USB interface Measurement category CAT II 1000V, III 600V Measurement category CAT III 600V, IV 300V Integrated test resistance 10 M¿ DAkkS calibration certificate included in delivery. 1 insulation and resistance measuring device 1 DAkkS calibration certificate 1 set of batteries 1 carrying strap 1 crocodile clip 1 cable set KS17-4 1 USB interface cable 1 short operating instructions 1 safety information sheet - Detailed operating instructions can be downloaded from the Internet at www.gossenmetrawatt.com