Fluke 1577 Insulation Multimeter

The Fluke 1577 Insulation Multimeter is a powerful two-in-one tool, merging the capabilities of a professional insulation resistance tester and a full-featured true RMS multimeter in a single, portable design. Built for electrical contractors, industrial technicians, and maintenance professionals, this versatile instrument simplifies troubleshooting and preventive maintenance while delivering high accuracy and reliability.

It offers two selectable test voltages (500V and 1000V) for insulation testing, measuring up to 600 MΩ, making it suitable for diagnosing motors, generators, cables, transformers, and switchgear. Equipped with live circuit detection, the device automatically prevents insulation testing if voltages above 30V are detected, ensuring user safety.

Beyond insulation testing, the Fluke 1577 functions as a true RMS multimeter, measuring AC/DC voltage (up to 1000V), current (up to 400 mA), resistance (up to 50 MΩ), continuity, and DC millivolts with precision. Its auto-discharge capability safely releases capacitive energy after tests, while the large backlit display ensures clear readings in any lighting conditions.

Engineered for field use, the 1577 comes with a rugged holster, remote probe, test leads, and alligator clips. It carries a CAT IV 600V / CAT III 1000V safety rating, offers IP40 protection, and can withstand demanding environments. With long battery life—capable of performing over 1000 insulation tests—and auto power-off functionality, the Fluke 1577 ensures maximum productivity and efficiency for professionals who need a reliable all-in-one testing solution.

Features

• Two-in-One Tool – Combines an insulation resistance tester and a true RMS multimeter in one compact device.
• Insulation Testing – Selectable 500V & 1000V test voltages with a measurement range up to 600 MΩ.
• True RMS Multimeter Functions – Measures AC/DC voltage up to 1000V, AC/DC current up to 400 mA, resistance up to 50 MΩ, continuity, and DC millivolts.
• Live Circuit Detection – Prevents insulation testing when terminal voltage exceeds 30V for added safety.
• Auto-Discharge Capability – Safely releases capacitive voltage after insulation testing.
• Large Backlit Display – Ensures easy visibility in low-light environments.
• Rugged & Reliable – Compact, shock-resistant design with IP40 protection for harsh work conditions.
• CAT IV 600V / CAT III 1000V Safety Rating – Provides the highest level of protection for industrial and commercial applications.
• Remote Test Probe Included – Makes hard-to-reach or repetitive testing more efficient.
• Long Battery Life – Performs over 1000 insulation tests on a single set of alkaline batteries.
• Three-Year Warranty – Ensures lasting durability and dependable performance.

Includes

• Remote probe
• Test leads
• Alligator clips
• Hard case
• Four AA alkaline batteries
• Quick reference guide
• CD rom with manual