The Fluke 1503 is a compact, rugged insulation resistance tester engineered for electrical safety verification in residential and commercial installations. It performs insulation resistance, earth bond resistance, AC/DC voltage, and general resistance measurements—making it essential for commissioning, troubleshooting, and preventative maintenance workflows. A remote test probe streamlines repetitive and hard-to-reach measurements. Integrated live circuit detection blocks testing when terminal voltage exceeds 30 V, while auto-discharge eliminates capacitive voltage in less than 0.5 seconds (C ≤ 1 µF), protecting both technician and circuit. The CAT IV 600 V rating ensures safety in demanding field environments.
Technical Specifications
Insulation Resistance
• Range: 0.1 MΩ to 2000 MΩ
• Test Voltages: 500 V DC, 1000 V DC (±20%, -0%)
• Accuracy: ±(1.5% + 5) up to 2000 MΩ; ±(10% + 3) above 2000 MΩ
• Short Circuit Current: 1 mA nominal
• Maximum Capacitive Load: 1 µF
Earth Bond Resistance
• Range: 20 Ω to 20.00 kΩ (four ranges)
• Accuracy: ±(1.5% + 3)
• Short Circuit Current: > 200.0 mA
AC/DC Voltage
• Range: 0.1 V to 600.0 V
• Accuracy (50–400 Hz): ±(2% of Reading + 3 digits)
• Input Impedance: 3 MΩ nominal; < 100 pF
General Resistance
• Range: 0.01 Ω to 20.00 kΩ
Display & Power
• Large backlit graphic display
• Four AA alkaline batteries (NEDA 15 A or IEC LR6)
• Battery Life: ≥ 1000 insulation tests; ≥ 2500 earth bond measurements
• Auto power-off enabled
Environmental
• Operating: -20°C to 55°C
• Storage: -40°C to 60°C
• Humidity: 0–95% @ 10–30°C; 0–75% @ 30–40°C; 0–40% @ 40–55°C
• Drop-proof: 1 m
• Vibration: 2g, 5–500 Hz (MIL-PRF-28800F Class 2)
– Key Features
• Live circuit detection prevents unsafe insulation tests
• Rapid auto-discharge for capacitive loads
• Dual test voltages (500 V DC and 1000 V DC) for comprehensive insulation assessment
• Remote test probe for inaccessible measurement points
• CAT IV 600 V overvoltage protection
– Typical Applications
• Pre-energization insulation verification
• Preventative maintenance testing of motor windings and cable runs
• Commissioning of newly installed electrical systems
• Field troubleshooting of low-voltage circuits
• Earth continuity and bonding verification
– Compatibility & Integration
Powered by standard AA alkaline batteries with extended runtime. Operates across a wide environmental range (-20°C to 55°C). Drop-rugged design rated for field use per MIL-PRF-28800F Class 2 vibration standards.
