Fluke 1587 FC-NIST Insulation Multimeter

The Fluke 1587 FC-NIST Insulation Multimeter combines digital insulation testing with full multimeter capability in a single handheld unit. It delivers insulation resistance measurement from 0.01 MΩ to 2 GΩ across five selectable test voltages (50 V, 100 V, 250 V, 500 V, 1000 V), making it suited for preventative maintenance and diagnostic work on motors, cables, transformers, and control circuits. The integrated digital multimeter covers AC/DC voltage to 1000 V, AC/DC current to 400 mA, resistance to 50 MΩ, plus capacitance, frequency, diode, continuity, and temperature measurement modes.

Live circuit detection automatically inhibits insulation tests when terminal voltage exceeds 30 V, and auto-discharge protects against capacitive shock - capable of handling loads up to 1 µF. The unit supports PI/DAR timed ratio tests for diagnostic trending of insulation degradation.

Technical Specifications

• Measurement range: 0.01 MΩ to 2 GΩ


• Test voltages: 50 V, 100 V, 250 V, 500 V, 1000 V


• Minimum test current @ 1 kΩ/V: 1 mA


• Maximum capacitive load: 1 µF


• Accuracy @ 250 V: ±(1.5% + 5) Voltage & Current


• DC voltage: 6 V to 1000 V, 0.001 V to 1 V resolution, ±(0.09% + 2) accuracy


• AC/DC current: 0 to 400 mA, 0.01 mA resolution


• DC current accuracy: ±(0.2% + 2)


• AC current accuracy: ±(1.5% + 2) Resistance & Additional Functions


• Resistance: 0 to 50 MΩ, 0.1 Ω resolution, ±(0.9% + 2) accuracy


• Frequency: 99.99 Hz to 99.99 kHz, ±(0.1% + 1) accuracy


• Temperature resolution: 0.1 °C


• Continuity, capacitance, and diode testing supported

Key Features

• True RMS measurement for AC voltage and current


• VFD low-pass filter for variable frequency drive applications


• Min/Max recording functionality


• Auto power-off to extend battery life


• CAT III 1000 V / CAT IV 600 V safety rating


• NIST-traceable calibration certificate included

Typical Applications Insulation diagnostics on rotating equipment, switchgear, cable runs, and control systems; motor windings; power distribution systems; preventative maintenance protocols.

Compatibility & Integration Fluke Connect® Measurements enables wireless data transfer and smartphone analysis via dedicated app. Supports PI/DAR trending with TrendIt™ graphs, historical asset tracking, temperature compensation, and cloud-based data storage.