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The Megohmmeter Model 6505 is a True Megohmmeter® portable instrument housed in a rugged field case that operates on either battery or line power. It performs voltage, insulation, and capacitance measurements. This instrument contributes to the safety of electrical installations and equipment.

Features include automatic calculation and presentation of the Dielectric Absorption Ratio (DAR) and Polarization Index (PI). The Model 6505 displays the test voltage, insulation resistance and the leakage current during the test. Capacitance of the sample and discharge voltage present at the test leads is displayed at the conclusion of the test.

The Model 6505 is designed with a high level of built-in safety features. This meter incorporates test inhibit capabilities which will not allow test voltages to be generated if a live sample is detected. The test terminals are recessed to ensure operating safety.


AC/DC Voltage Measurement
Range1 to 4000V
Accuracy1 to 99.9V: ±(1% R + 5ct)
100 to 4000V: ±(1% R + 3ct)
Resolution1 to 99.9V: 0.1V
100 to 999V: 1V
1000 to 4000V: 2V
Frequency Range1 to 2500V: DC or 15 to 500Hz
2501 to 4000V: DC
Input Impedance750kΩ or 3MΩ (range dependent)
Insulation Measurement
Test Voltage / Resistance Range500V: 10kΩ to 2TΩ
1000V: 10kΩ to 4TΩ
2500V: 10kΩ to 10TΩ
5000V: 10kΩ to 10TΩ
Measurement Accuracy10kΩ to 399.9GΩ: ±(5% R + 3ct)
400GΩ 10TΩ: ±(15% R + 10ct)
Variable Voltage40 to 5,100V
Auto DischargeDischarge time < 7s/µF from Vtest to 25V @ 5000V
Live Circuit IndicatorTest inhibition if terminal voltage > 40% of test voltage
General Features
Programmable AlarmYes
Ramp ModeNo
Step ModeNo
Capacitance Measurement0.005 to 49.99µf
Open Circuit Voltage≤ 1.1 x Vn ±2V (Vn ±2% in variable mode)
Power SupplyRechargeable NIMH battery pack;
external 85-256V, 50/60Hz
Battery Life≥ 1500  tests at 5000V into 5MΩ with a duty cycle of 5 seconds on and 25 seconds off
Charging Time6 hours approximately (charging allowed during tests)
Dimensions10.63 x 9.84 x 7.09” (270 x 250 x 180mm)
Weight9.5 lbs (4.3kg)
Altitude Operating6562′ (2000m)
Operating Temperature14° to +131°F (-10° to +55°C) ≤80% RH
Storage Temperature-40° to +158°F (-40° to +70°C) ≤90% RH
IP RatingIP 53
Safety ComplianceEN 61010-1, EN 61557, 1000V CAT III, Pollution Degree 2

Product Features

  • Test voltage combination of 500V, 1000V, 2500V and 5000V
  • Insulation measurements from 30k Ohm to 10T Ohm
  • Adjustable and programmable test voltage (40 to 5100V)
  • Automatic calculation of DAR and PI values
  • Direct measurement and display of Capacitance and Leakage Current
  • Display of resistance, test voltage and run time
  • Programmable test run times and PI ratio times
  • Automatic test inhibition if live sample (<25)
  • Automatic discharge and display of discharge voltage
  • Large dual-display with time, voltage and measurements shown
  • Rugged dual wall weatherproof field case
  • Designed and built to IEC safety standards
  • EN 61010-1, 1000V CAT III