Oil Test Sets

Fully automatic insulating oil dielectric breakdown testing


Megger’s range of automatic oil test sets performs accurate breakdown voltage tests on mineral, ester and silicone insulating liquids. Common across the range precision, shatter proof test vessels are easy to clean and provide repeatable results, whether they are used in the field or laboratory featuring lock in precision electrode gap setting adjustment wheels. The transparent, shielded lid and large test chamber allows easy access to the test vessel, enabling users to see what is happening within the test chamber.

All of the current test standards world wide are preloaded in the instrument for convenient automatic operation, however should a new test standard or an existing standard be amended there are 3 custom tests that can be configured to the new requirements. This enables testing to continue to cover the short period while Megger updates the test procedure files. New updated files are then downloaded by the user and installed into the test instrument via a USB memory stick / flash drive.

Test results are identified either by a serial number or asset ID and are time and date stamped. The Megger asset and data management software, PowerDB Lite, is bundled at no extra cost providing an excellent tool for downloading and printing results.

An optional internal printer provides a hard copy of results. Ink based printout ensures durability at all temperatures. USB flash drive for easy transfer of test results, external USB printer and on the AF model a barcode scanner. User safety is paramount and Megger have designed independent and dual redundant high voltage cut-off circuitry to ensure safety. During a test the operator can terminate by pressing any button on the keyboard which will remove high voltage immediately and abort the test. The transparent lid provides ample visibility within the chamber yet is protected and electrically shielded by a screen with multiple links to instrument ground.

OTS PB models

These 60 kV and 80 kV oil test sets are small and the lightest on the market with weight ranging from 16 kg to 23.5 kg depending on model configuration. They come complete with optional carry bag and transport case. The carry bag has pouches for electrode accessory pack, leads, quick user guide, paper roll etc. these units can be supplied mains powered only, or mains powered and battery operated for additional flexibility in portable applications. The optional batteries are NiMH, or if selecting an 80 kV model a lead acid battery can be specified. In addition, an internal 12 V DC charger and vehicle adaptor cable is standard when any battery option is fitted.

OTS AF models

These 60 kV, 80 kV and 100 kV models have much a larger test chamber for even easier access and cleaning, particularly useful in a lab environment. They are fitted with a 12 key alpha-numeric keypad to facilitate entry of test ID, file names, notes etc. Alpha characters are entered by repetitive pressing on a key. The AF models also have the ability to use a USB barcode reader to scan oil sample barcode labels, ideal for better integration with a LIM system.

  • Fully compliant with international and national standards
  • Full Range to suit all user needs
  • Easy adjust – locking electrode gap
  • Fast precision breakdown detection
  • Ultra-fast HV switch off time
  • Suitable for mineral, ester and silicone oils
Teknisk guide
The Megger guide to insulating oil dielectric breakdown testing
OTS Test Standards


The attached file will update all the test standards of your OTS to the latest versions. Do not change the file name or it will not work. Please follow the instructions below:-


1. Extract the attached file (stdSeqs.db) to a USB memory stick


2. Insert the memory stick into the Type A USB port on the front panel of the OTS (or the Type A USB port on the rear of the OTS)


3. On the OTS, navigate to the Tools menu with the Hammer & Wrench symbol


4. Scroll down and select Manage test standards


5. On the next screen select Update Standards (USB) and the instrument will upload the new file from the USB stick.


6. The instrument will now have the latest standards installed ready to use.
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