Megger OTD Oil Tan Delta Oil Tester


Megger approved distributor and service centre.

A new addition to the comprehensive range of Megger Oil Test Sets, the OTD measures Tan Delta, resistivity and relative permittivity of insulating oils.

More details



£ 26,500.00

(£ 31,800.00 inc VAT.)

Add to wishlist

The Megger Oil Tan Delta (OTD) is a laboratory instrument, which measures the Tan Delta, Resistivity and Relative Permittivity of insulating liquids.  These tests give a wider picture of the overall quality of the insulating oil, and will indicate if there is any contamination. Megger has developed features of the OTD to ensure that productivity levels within laboratories are maximised.

Monitoring and maintenance of oil quality is essential to ensure the reliable operation of oil filled electrical equipment. Codes of practice have been established in many countries that include tests for Tan Delta, Relative Permittivity and Resistivity.

User safety is paramount and Megger have designed independent, dual redundant high voltage cut-off circuitry to ensure safety. During a test, press any button on the keypad to remove the high voltage immediately and abort the test.

The OTD has a 12 key alpha-numeric keypad to facilitate entry of test ID, filenames, notes, etc.


Keypad and a tabular designed user interface for efficient navigation and control.
Bright 3.5” colour display for ease of use.
Fully automated test sequences.
16 pre-installed international standards.
6 user programmable sequences.
14 supported languages on the display.
Test Cell heating up to 110°C  with uniformity across the cell - IEC 60247.
Oil drain facility - manual and fully automated micro processor controlled.
Minimal Test Cell components - easy to assemble and disassemble.
Safe operation with dual redundant micro switches.
Internal impact printer - automatically prints at the end of a test or manually if preferred.
USB download of stored results to PowerDB.

OTD test sets are supplied with sixteen standard test sequences pre-installed, to support a set of international standards.

IEC 60247:2004;
IEC 61620:1998;
ASTM D924-08;
ASTM D1169:2002;
BS 5737:1979;
JIS C2101:1999;
VDE 0380-2:2005_01;
IS 6262:1971;
IS 6103:1971;

The instrument can also store up to 6 additional user-defined custom test sequences. Megger’s asset and data management software, Power DB Lite, is bundled at no extra cost providing an excellent tool for downloading and printing results.

Megger OTD Specifications:

  • Tan Delta Measurement range: 1 x 10-6 up to 4.
  • Resolution: 1x10-6.
  • Accuracy: ± 1% reading, ± 1 x 10-5.
  • Relative Permittivity Measurement Range: 1 up to 30.
  • Resolution: 0.01.
  • Accuracy: ± 0.5%.
  • Resistivity Measurement Range: 2.5 MΩm up to 100 TΩm.
  • Resolution: 0.01.
  • Test Temperature Range: 10 °C - 110 °C.
  • Resolution: 0.1 °C.
  • Accuracy: ± 1 °C.
  • Test Voltage AC Range: 500 V - 2000 V - 55 Hz.
  • DC Range: 125 V - 500 V.
  • Quasi Rectangular Square Wave: 100 V 0.3 Hz.
  • Resolution: 1 V.
  • Accuracy: ±2%, ±1 V.
  • Power Supply: 100 V - 240 V, 50 Hz - 60 Hz, 300 VA.
  • Operating Temperature Range: 0 °C - 50 °C (32 °F - 122 °F).
  • Interface: USB Type B.
  • IP Rating: IP30.
  • EMC: IEC 61326.
  • Dimensions: 580 x 420 x 290 mm (22.8 x 16.5 x 11.5 inch).
  • Weight: Instrument 22 kg (48.5 lb).
  • Test Cell Capacitance Range: 70 pf (± 3 pf).
  • Weight: 2.7 kg (5.9 lb).
  • Material: 316L Stainless Steel / Quartz Glass.
  • Megger OTD warranty: 12 months.

Includes: OTD test cell with carry case, Product CD, Mains lead, USB cable, Power DB Lite, Test cell probe, Drain hose, Printer paper, Printer Ribbon.

Write a review

Megger OTD Oil Tan Delta Oil Tester