AEMC Megohmmeter Spotlight: Models 6505, 6550 & 6555

For professionals in electrical maintenance and testing, proper insulation testing isn’t just a best practice—it’s a necessity. AEMC’s megohmmeter series delivers the reliability, functionality, and safety required for inspecting transformers, cables, motors, switchgear, and more. Let’s explore how each model matches different test requirements.

Model 6505 Megohmmeter – Rugged Versatility in a Compact Package

Ideal for field technicians needing a dependable, mid-range insulation tester.

• Test voltage: up to 5 kV (500/1,000/2,500/5,000 V) via programmable increments from 40 V upward.

• Resistance range: 10 kΩ up to 2 TΩ (at 500 V) and up to 10 TΩ (at 5 kV).

• Auto calculation of DAR & PI: Dielectric Absorption Ratio and Polarization Index are displayed automatically.

• Safety and convenience: recessed terminals, live-circuit inhibit, battery/AC power, and integrated digital/analog display of voltage, resistance, leakage current, capacitance, and discharge voltage at test end.

Use Cases:

• Routine insulation checks on low- to medium-voltage cables and equipment.

• Preventive maintenance in industrial installations, motor insulation testing.

• Environments where portability and safety lock-out are priorities.

Model 6550 Megohmmeter – High Performance with 10 kV Capability

Built for more demanding environments where insulation withstand tests require elevated voltages.

• Max test voltage: up to 10,000 V with fixed and programmable modes including step and ramp profiles.

• Measurement up to 25 TΩ across multiple voltage settings.

• Advanced analytics: DAR, PI, DD (dielectric discharge), ΔR (ppm/V), capacitance, leakage current, and even temperature-compensated resistance readings.

• User interface: graphic LCD with analog bargraph, backlight, timer, alarms, rugged IP 54-rated enclosure, battery or AC power, and exportable via DataView® software.

Use Cases:

• Insulation testing on medium-voltage switchgear, transformers, or industrial motors.

• Testing aging or damaged insulation where leakage currents must be tracked over time.

• Applications requiring step/ ramp voltage profiling, historical trend analysis, or DAR/PI thresholds.

Model 6555 Megohmmeter – Elite-Level Testing at 15 kV

The flagship in the lineup—designed for maximum voltage testing, technical flexibility, and toughest environments.

• Test voltage range: up to 15,000 V programmable via step (up to 10 steps) and ramp profiles; supports three variable profiles + fixed settings of 500 V to 15 kV.

• Insulation range: from 10 kΩ up to 30 TΩ depending on voltage level.

• Instrumentation outputs: DAR, PI, DD, ΔR, capacitance, leakage current and automatically-generated alarms; graphical display and export via DataView®.

• Built tough: IP65-rated rugged case, graphical LCD, battery or AC operation.

Use Cases:

• High-energy transformer winding tests, insulation checks on high-voltage cables.

• Commissioning and QA testing where ramp and step tests help evaluate voltage endurance.

• Critical industrial, utility, and field environments where ruggedness and full diagnostics are essential.

Side-by-Side Megohmmeter Comparison

Choosing the Right Model

• Choose the 6505 if you need a reliable, mid‑range tester for everyday insulation diagnostics up to 5 kV.

• Go with the 6550 when step/ramp testing up to 10 kV, comprehensive reporting, and automation become essential.

• Select the 6555 for the most demanding applications: highest voltage (15 kV), tight diagnostics, maximum durability, and environmental protection.

With AEMC’s True Megohmmeter® series, every application—from basic field checks to advanced high-voltage diagnostics—is supported by accurate measurements, programmable testing, insightful analytics, and rock‑solid safety. Let us help you select the ideal model to meet your project’s insulation testing needs.