With the latest technology in a small-sized, robust and easy-to-use instrument, this series of earthing resistance tester is mainly used to test the earthing resistance of transformer, lightning-proof system, high-voltage power tower and telecommunication equipments, etc., providing a perfect solution for earthing-resistance test.• Ambient temperature and humidity for test: 0~40°C, <80%RH (without condensation

• Ambient temperature and humidity for test: 0~40°C, <80%RH (without condensation
• Temperature for battery charging: 10~40 ºC , < 80% RH
• Storage temperature and humidity: -10~50 ºC , < 90% RH (without condensation)
• Temperature & humidity for battery-pack storage: -20~30ºC, < 80% RH (without condensation)
• Altitude for storage: < 12000 m
• Altitude for operation: < 2000 m
• Clamp Diameter: φ51mm
• Display: LCD with backlight; Max. number: 9999
• Overflow indication: > LIMIT
• Underflow indication: “-“
• Frequency for updating display:
• For earthing-resistance/leak-current: once per second (once in every four seconds if AVERAGE function is used )
• Detection of output voltage: twice per second
• Interference voltage: 4 time per second
• Interference frequency: once per second
• Interference current: once per second
• Terminals:
1) Resistance test:
• 
2) USB, charger
• Power supply
• 1) LR14 alkaline battery × 6; rated voltage: 1.5 V × 6
• 2) Battery pack: rechargeable nickel – metal hydride batteries; rated voltage: 7.2 V
• 3) Charger: rated input voltage: 100 ~ 240 V; rated frequency: 50 ~ 60 Hz; output voltage: 12 VDC 3A
• power consumption:
15 VA (using charger)
6 VA (using batteries or rechargeable battery pack)
• powering time: Alkaline battery: about 5 hours; battery pack: about 9 hours (with backlight turned off)
• input voltage: 250 V AC (50~400 Hz)
• rated voltage to earth: 300 Vrms (CAT III)
• Insulation strength: 6880 VAC: 15 seconds
• Overload protection: 250 VAC between terminals: 1 minute
• Dimensions: About 260 (W)×125 (H)×280 (L) mm
• Weight: About 2.5 kg
• Applicable standards:
• Safety: EN61010-1:2001, EN61010-031:2002, Pollution degree 2; Measurement category III 300V;
• EMC: EMC: EN61000-3-2:2000 IEC61326-1: 1997 A grade
• Testing earthing resistance, soil resistivity, interference voltage/interference/current
• Compensating test-wire resistance
• Data saving function: recording (100 records), deleting a single record, deleting all records, uploading data to PC
• Clock
• AVERAGE function for test data
• ALARM function for input terminals
• Charging battery
• Auto powering-off

Safety rating: CE(EMC) ETL CAT III 300V RoHS