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The Megohmmeter Model 6550 is a high-end portable measuring instrument intended for the measurement of a wide variety of electrical insulation resistance values on cables and devices operating at high voltage. It is the only fully automated 10,000V graphical insulation tester. The Model 6550 is packaged in a rugged case that is IP54 when closed. Test results and configuration information is provided on a graphical LCD screen as well as exportable through the use of DataView software provided. This megohmmeter can operate on battery or AC power while testing.

The Model 6550 also offers the ability to program up to three-step voltage profiles (from 40 to 10,000), each containing up to ten steps. There are also ramp profiles and three programmable test voltages in addition to the standard fixed voltages of 500, 1000, 2500, 5000, and 10,000V.


AC/DC Voltage Measurement
Range1 to 4000V
Accuracy1 to 99.9V: ±(1% R + 5ct)
100 to 4000V: ±(1% R + 1ct)
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 Impedance 3MΩ
Insulation Measurement
Test Voltage / Resistance Range500V: 10kΩ to 2TΩ
1000V: 10kΩ to 4TΩ
2500V: 10kΩ to 10TΩ
5000V: 10kΩ to 15TΩ
10,000V: 10kΩ to 25TΩ
Measurement Accuracy10kΩ to 39.99GΩ: ±(5% R + 3ct)
40.0GΩ to 10.00TΩ: ±(15% R + 10ct)
400GΩ to 3.999TΩ: ±(15% R + 10ct) @ 500 and 1000V only
4.00 to 10.00TΩ: ±(20% R + 10ct) @ 2500V
4.00 to 15.00TΩ: ±(20% R + 10ct) @ 5000V
4.00 to 25.00TΩ: ±(20% R + 10ct) @ 10000V
Variable Voltage40 to 10,000V
Auto DischargeDischarge time < 27s/µF from Vtest to 25V @ 10,000V
Live Circuit IndicatorInhibit test if terminal voltage > 25V prior to initialization of test
General Features
Programmable AlarmYes
DAR – PI – DD  – R(t)Yes
Ramp ModeProgrammable start and end voltage, duration
Step ModeUp to 10 steps (voltage and duration configurable for each step)
Capacitance Measurement0.005 to 19.99µf
Leakage Current Measurement0 to 8 mA
Short Circuit Current≤5mA DC (adjustable in setup mode)
Calculation of R at Reference T°Yes
Memory256 registers (80,000 points)
CommunicationUSB optically-isolated port
SoftwareDataView Software (included)
Power Supply2 x rechargeable 9.6V NiMH battery pack;
external 90-260V, 50/60Hz
Battery Life≥ 2 h at 10,000V (insulation test)
Charging Time6 hours approximately (charging allowed during tests)
Dimensions13.4 x 11.8 x 7.9” (340 x 300 x 200mm)
Weight13.7 lbs (6.2kg)
Altitude Operating6562′ (2000m)
Operating Temperature32° to +95°F (0° to +35°C) ≤75% RH
Storage Temperature-40° to +158°F (-40° to +70°C) ≤90% RH
IP RatingIP 65
Safety ComplianceIEC 61010-1, IEC 61557, 1000V CAT IV, Pollution Degree 2

Product Features

  • Detection and measurement of input voltage, frequency, and current prior to running a test
  • Measurements at a fixed test voltage of 500, 1000, 2500, 5000, 10,000VDC
  • Ramp voltage measurements with a ramp from 40 to 1100V
  • Step voltage measurements with steps from 40 to 10,000V
  • Non-destructive (Early break) test, test stopped at a preset current (Break at I-limit) or Burn mode with no predefined stop point
  • Digital filtering of insulation measurements
  • Live measurement of the voltage to warn the operator of potential unsafe conditions
  • Programmable thresholds to trigger audible
  • Timed measurement duration checks
  • Fuse protection with display indication of defective fuse condition
  • Stores up to 80,000 measurements
  • Optically-isolated USB communication for transfer onto PC and report generation with the included DataView software