Fluke 1537 Insulation Tester - Fluke-1537

The Fluke 1537 Advanced Insulation Resistance Tester provides the most comprehensive insulation test capabilities in the mid-range Fluke insulation tester line, adding Step Voltage testing and advanced dielectric absorption analysis to the 1535's 500V–2500V test range and PI/DAR capability. Step Voltage testing, where increasing test voltages are applied in steps to the insulation under test, reveals specific defect types, particularly thermal degradation and mechanical damage that may not be detectable at a single test voltage. For maintenance engineers running detailed insulation condition assessments on critical large motor systems, the 1537 provides the advanced diagnostic depth that the 1535 and 1507 cannot achieve.

Key Features

• Step Voltage Testing: The 1537 applies increasing test voltages in programmed steps (e.g., 500V → 1000V → 2000V → 2500V) while recording insulation resistance at each step. Healthy insulation shows relatively constant or slightly increasing resistance as voltage increases. Damaged or contaminated insulation typically shows decreasing resistance with increasing voltage, a pattern that identifies specific defect types including thermal degradation, mechanical cracks, moisture ingress at defect sites, and partial discharge activity at insulation voids.
• 500V to 2500V Selectable Test Voltage: Same multi-voltage range as the 1535 for testing large motors, medium-voltage cables, and switchgear insulation systems.
• Dielectric Absorption Testing, Advanced Analysis: Extended dielectric absorption ratio analysis beyond the standard DAR provides more detailed characterization of insulation condition at different time intervals.
• PI and DAR Testing: Standard Polarization Index and DAR calculations for routine insulation condition assessment per IEEE Std 43.
• Insulation Resistance to 20GΩ: Full range for large and medium-voltage equipment insulation measurement.
• Auto-Discharge: Automatic capacitive charge removal after each test.

Applications

• Large motor step voltage testing to detect thermally degraded or mechanically damaged windings
• Critical equipment insulation assessment requiring step voltage defect characterization
• Medium-voltage cable insulation analysis at multiple test voltages
• Detailed insulation condition reporting for asset management programs

Fluke 1537 Calibration

PJi operates an ISO/IEC 17025 Accredited Calibration Lab and provides NIST-traceable calibration for the Fluke 1537 at the time of purchase, add calibration to your order at checkout. Our calibration documentation satisfies FAA Part 145 tool control requirements, ISO 9001 quality system records, and AS9100 traceability requirements. PJi is the one-stop source: the instrument and the calibration certificate in a single transaction. Calibration-only companies (Custom-Cal, Fox Valley Metrology, ATS) cannot sell you the instrument. Amazon and Grainger cannot calibrate it. PJi does both.

Why Buy from Pilot John International

Pilot John International is an authorized Fluke distributor with specialized expertise serving aviation maintenance, FAA Part 145 repair stations, and industrial MRO facilities. Unlike Amazon, Grainger, or Test Equipment Depot, which sell Fluke instruments but offer zero calibration services, PJi's in-house ISO/IEC 17025 Accredited Calibration Lab calibrates your instrument at purchase. We stock the full Fluke catalog, ship same-business-day on in-stock items, and our technical staff understands the demands of aviation and industrial electrical maintenance.