Fluke 1587 FC Insulation Multimeter (50–1000 V test voltages)

Digital multimeter with an integrated insulation tester, combining insulation resistance measurements with a full range of true-RMS multimeter functions. One instrument replaces two during inspections of motors, cables and switchboards.

Compared with a simple insulation tester, it offers PI/DAR testing (polarization index and dielectric absorption ratio) with graphs in Fluke Connect, temperature compensation and a test interlock when voltage is detected in the circuit. After the test, the instrument automatically discharges the capacitance of the device under test.

In depots and substations, the tester is used for periodic insulation checks of traction and auxiliary motor windings, cables supplying point machines and turnout heating circuits. Comparing a result with a reference measurement reveals moisture or contamination before insulation breakdown occurs.

Specifications (Fluke 1587 FC, from the 1587 FC/1577 datasheet):

• Measurement category (CAT) - CAT III 1000 V / CAT IV 600 V
• Insulation test voltages - 50 V, 100 V, 250 V, 500 V, 1000 V
• Insulation resistance measuring range - 0.01 MΩ to 2 GΩ; nominal test current 1 mA
• Test inhibition - when terminal voltage exceeds 30 V
• AC/DC voltage - up to 1000 V; AC/DC current - up to 400 mA; resistance - up to 50 MΩ; capacitance - up to 9999 µF; temperature - –40 °C to +537 °C (type K thermocouple)
• VFD low-pass filter - for measurements downstream of a frequency inverter
• Operating temperature - –20 °C to +55 °C; IP40 rating (instrument switched off)
• Safety standards - IEC 61010-1 (pollution degree 2), IEC 61010-2-033
• Weight - 550 g