The ground bond test specialist.

BLTU4 is an automatic and portable bond and loop resistance tester with operator guidance.

 Good bonding ensures unwanted current from lightning strikes or faulty equipment can be safely routed away from the structure. BLTU4 provides automatic testing of ground bonding points on aircraft and other large structures and records the test data for full traceability.

Main BLTU Applications

BLTU application 1 - aircraft helicopters and large structures

Measuring resistance on aircraft, helicopters, UAV’s & large structures such as wind turbines, & chemical plant infrastructure

BLTU application 2 - Bond resistance between structural elements

Bond resistance between structural elements

BLTU application 3 - loop resistance and integrity of cable shields and bonding straps

Loop resistance and integrity of cable shields and bonding straps

BLTU application 4 - testing during manufacture and scheduled checks
Testing during manufacture and as part of safety compliance tests during scheduled maintenance
  • 1kHz frequency
  • Uses 4-wire (Kelvin) resistance measurement to ensure micro-ohm accuracy
  • Bond test resistance range from 0.03mΩ to 20Ω
  • Loop test resistance range from 0.5mΩ to 200mΩ
  • Joint test resistance range from 0.05mΩ to 200mΩ
  • On-screen operator instructions
  • Lightweight so only requires a single operator
  • Paperless process logs and uploads test results, guaranteeing traceability
  • Pass/Fail status indication on couplers and bond probes
  • Dimensions 345mm length x 295mm width x 150mm depth
  • Weight 7kg / 15.5lbs (BLTU-4 unit only)
  • Integrated LCD 10.4” touchscreen monitor
  • Smart Li-Ion “hot-swap” batteries
  • Soft-start current source prevents arcing
  • Auto and manual modes
  • Active couplers and bond probes – no need to touch screen
  • Powered by MKAT test management software, rated ‘easy to use’ by 90% of our customers.

Some of our BLTU customers

2.5 BLTU Customer logo 1 Airbus
2.5 BLTU Customer logo 2 Comac
2.5 BLTU Customer logo 3 GKN
2.5 BLTU Customer logo 4 Spirit


“We really value the flexibility of the system and the quality of the results; the F2500 delivers exactly what we asked for.”

Zander van der Steege

Project Test Engineer, Santon Switchgear

“The MK Test solution…improves performance and streamlines manufacturing.”

Jakub Lukasiewicz

Space Programs Production Manager, PZL Warszawa-Okecie

“MK are the industry standard for automated test equipment. Using their equipment has greatly improved our efficiency and accuracy when testing.”

Sam Baker

Sales Manager, Itel Electronics

“RTS is an innovative solution compared to traditional wiring testers. It allows workload reduction by fast set-up and fast testing.”

Olivier Boizot

Project Leader, Airbus

“Faster testing, easier to use, and [testing] can be performed by one person.”

An ExLRT user from Lufthansa Technik

“The MK tester is very reliable – the repeatability is what makes it valuable.”

Peter Hicks

Chief Electronics Engineer, Pandect Precision Components

Latest BLTU insights

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4.3 Brochure thumbnail 12 BLTU4

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