MEGGER OTD Oil Tan Delta

The MEGGER OTD Oil Tan Delta is a laboratory instrument, which measures the Tan Delta, Resistivity and Relative Permittivity of insulating liquids.

SKU: 5051

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MEGGER OTD Oil Tan Delta

Oil Tan Delta (OTD) is a laboratory instrument that measures Tan Delta, resistivity, and relative permeability of insulating liquids. These tests give a more complete picture of the overall quality of the insulating oil and will indicate whether there is any contamination. Megger has developed the OTD functionality to ensure that productivity levels in laboratories are maximized. Microprocessor-controlled induction heating means there is temperature uniformity throughout the battery, according to IEC 60247, and cooling the fan effectively speeds up battery cooling time.

The device has a temperature measurement range of 10 to 110 ºC, with an accuracy of ± 1 ºC. It can be set to preheat before testing. The automatic oil change facility eliminates the need to move the oil tank.

Key Features of the Megger OTD

  • Equipped with a microprocessor-controlled inductive heater, the OTD ensures uniform temperature distribution throughout the test cell, adhering to IEC 60247 standards. Additionally, an integrated fan accelerates the cooling process, enhancing the efficiency and throughput of laboratory operations.
  • Safety is paramount with the OTD Oil Tan Delta. The instrument allows for the immediate termination of tests at any press of a button, cutting off high voltage instantly to protect the operator and the equipment. This feature, along with the design of the cell components that minimize turbulence and prevent air entrapment, ensures safe and reliable operation.
  • The OTD’s automated oil drain facility eliminates the need for manual handling of the oil vessel, thus increasing productivity and reducing the risk of spills or contamination. The instrument can be preheated before testing, which optimizes test conditions and results accuracy.

MEGGER OTD Oil Tan Delta Specifications:

  • Tan DeltaMeasurement range:1×10-6 to 4
  • Resolution: 1×10-6
  • Accuracy: ± 1%
  • reading :± 1 x 10-5
  • Relative PermittivityMeasurement Range :1 to 30
  • Resolution:0.01
  • Accuracy: ± 0.5%
  • Resistivity MeasurementRange: 2.5 MΩm to 100 TΩm
  • Resolution:0.01
  • Accuracy:2%
  • Test TemperatureRange:10 °C to 110 °C
  • Resolution: 0.1 °C
  • Accuracy: ± 1 °C
  • Test VoltageAC Range :500 V to 2000 V55 HzDC
  • Range:125 V to 500 V
  • Quasi Rectangular Square Wave:100 V 0.3 Hz
  • Resolution: 1 V
  • Accuracy: ±2% ±1 V
  • Power Supply:100 V to 240 V50 Hz to 60 Hz300 VA
  • Results Frequency: tan ∂ (Sin) 40 Hz – 65 HzQuasi 100 V 0.3 Hz
  • Environmental SpecificationsOperating Temperature Range:0 C to +50 C (32 F to 122 F)
  • Storage Temperature Range:-20 C to +55 C (4 F to 131 F)
  • Humidity: 90% non-condensing
  • Dimensions :580 x 420 x 290 mm(22.8 x 16.5 x 11.5 inch)
  • Weight Instrument:22 kg (48 lb 8 oz)
  • Interface: USB Type B
  • IP Rating: IP30
  • EMC: IEC 61326
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Megger since 1889 is a leading global premium manufacturer of measurement and testing technology. Megger top priority has always been to make your everyday work easier and safer. As such, insulation testers, micro-ohmmeters, and multimeters are among the long line of Megger inventions, making this brand one of the pioneers in the electrical industry. Megger products combine many years of experience and the valued feedback from our global users with the inventiveness and conscientiousness of our product developers. In Germany, we manufacture at three sites, Aachen, and Baunach near Bamberg and Radeburg near Dresden. Other manufacturing locations are based in Sweden, England, and America.



Data Sheet


Specification Detail
Tan Delta Measurement Range 1×10-6 to 4
Resolution 1×10-6
Accuracy ± 1% reading ± 1 x 10-5
Relative Permittivity Measurement Range 1 to 30
Resolution 0.01
Accuracy ± 0.5%
Resistivity Measurement Range 2.5 MΩm to 100 TΩm
Resolution 0.01
Accuracy 2%
Test Temperature Range 10 °C to 110 °C
Resolution 0.1 °C
Accuracy ± 1 °C
Test Voltage AC Range 500 V to 2000 V at 55 Hz
DC Range 125 V to 500 V
Quasi Rectangular Square Wave 100 V 0.3 Hz
Resolution 1 V
Accuracy ±2% ±1 V
Power Supply 100 V to 240 V, 50 Hz to 60 Hz, 300 VA
Results Frequency tan ∂ (Sin) 40 Hz – 65 Hz, Quasi 100 V 0.3 Hz
Environmental Specifications Operating Temperature Range 0 C to +50 C (32 F to 122 F)
Storage Temperature Range -20 C to +55 C (4 F to 131 F)
Humidity 90% non-condensing
Dimensions 580 x 420 x 290 mm (22.8 x 16.5 x 11.5 inches)
Weight Instrument 22 kg (48 lb 8 oz)
Interface USB Type B
IP Rating IP30
EMC IEC 61326