Lutron ET3000 Earth Resistance Tester

Lutron ET‑3000 – Earth Resistance Tester Specifications

🌍 Measurement Capabilities

• Measures earth resistance and earth voltage

• Resistance ranges:
  • 0.00–19.99 Ω
  • 0.0–199.9 Ω
  • 0–1999 Ω

• Resolution:
  • 0.01 Ω, 0.1 Ω, 1 Ω respectively

• Accuracy:
  • ±(2% of reading + 0.1 Ω) in 20 Ω range
  • ±(2% of reading + 3 digits) in 200 Ω and 2000 Ω ranges

• Earth voltage measurement:
  • 0–199.9 V AC (50/60 Hz)
  • Resolution: 0.1 V
  • Accuracy: ±(1% of reading + 4 digits)

⚡ Display & Response

• Display type: Large 18 mm (0.7″) LCD

• Max display count: 1999

• Data hold function: Yes

• Response time:
  • Resistance: ~4 seconds
  • Voltage: ~1 second

• Over-input indication: Displays “1 .” when input exceeds range

• Power-off modes: Manual switch or auto power-off (~2 minutes of inactivity)

🔧 Electrical & Safety Features

• Input configuration: Standard 3‑terminal setup (E, P, C)

• Safety compliance: IEC 1010 standard

• Overload protection:
  • Resistance mode: Up to 200 V AC for 10 seconds between terminals
  • Voltage mode: Up to 300 V AC for 1 minute

• Insulation resistance: ≥5 MΩ between circuit and casing, tested at 500 V DC

🔋 Power & Environmental Specs

• Power supply: 6 × AA batteries (DC 9 V total)

• Current consumption:
  • Resistance mode: ~74–84 mA
  • Voltage mode: ~82 mA

• Operating temperature: 0 °C to 50 °C

• Operating humidity: ≤80% RH (non-condensing)

• Storage temperature: –20 °C to +60 °C

• Storage humidity: ≤90% RH (non-condensing)

📏 Physical Details

• Dimensions: 160 × 120 × 65 mm

• Weight: Approx. 560 g (including batteries)

🧰 Included Accessories

• Test leads (red, green, black with alligator clips)

• Auxiliary earth spikes (×2)

• Carrying case

• User manual

✅ Quick Summary Table