The PBS-4100 Plus Vibration Analysis Tool for Aviation

The new and powerful PBS-4100 PLUS is the latest model in the portable PBS family, which is breaking new ground. It is the most advanced vibration analysis and trim balancing system available for the military and commercial aviation community.

MTI Instruments PBS-4100+ Workflow for Engine Vibration Analysis and Balancing

Video Credit: MTI Instruments

The PBS-4100 PLUS is both flexible and powerful for industrial users. It can be used with the latest aviation turbofan, an aero-derivative gas turbine or a motor-driven pump in a power plant. It is extremely strong and rugged and saves almost half of the weight and size of previous PBS-4100 versions.

The system features a sealed outer case, passive cooling, and internal shock protection, so it can take the hits and work continuously. It simplifies the jobs of power plant engineers and aviation mechanics. The sophisticated electronics and software of the PBS-4100 PLUS streamline vibration testing, while its low weight and small size make it easy to handle.

The PBS-4100 PLUS can be used on any type of engine or aircraft to diagnose vibration problems, perform engine vibration surveys, and trim balance engines. Pre-programmed parameters for each engine model provide rapid set-up and ensure accurate data. This tool continues a two-decade tradition of supplying airmotives, airlines, and engine manufacturers with a reliable and easy-to-use engine vibration tool.

Re-training or additional accessories are not required for users who already own an earlier model of the PBS-4100, as the new PBS- 4100 PLUS is fully compatible with all earlier PBS systems. Existing procedures, cables, and balancing coefficients will all work.

Complete Set of Functions – The proven WinPBS software package provides a set of vibration analysis tools for users to select the specific engine type, collect and record vibration data, investigate vibration problems, and balance engines. A set of maintenance and self-calibration utilities are also included to the system to keep the system availability at 100%.

Vibration Surveys – Clear, concise full-color graphics pinpoint vibration problems from acceleration and deceleration runs. Broadband and tracked vibration levels are accurately displayed in real time, enabling rapid diagnosis and return of the aircraft to service.

Vibration Diagnostics – The specific causes of engine vibration can be easily identified and repairs can be carried out quickly using the full-color vibration surveys and the spectrum analysis capabilities of the PBS-4100 PLUS.

Trim Balancing – With the Balancing Wizard, users can navigate through the trim balancing process with easy-to-follow instructions and graphics. Accurate weight solutions get the aircraft back into service quickly. Also, the PBS-4100 PLUS incorporates a 3-shot plot balance method to keep users flying when needed.

Turbine vibration vs time

General Accuracies

Speed (rpm)
Data via Digital Data Interface (DDI) Data via Analog Output
0.02%3 0.05%3


Acceleration Input2/Velocity Output
Tracked Broadband Phase
0.5% typical 1.0% max 0.5% typical ±1° max
Acceleration Input2/Displacement Output
Tracked Broadband Phase
0.5% typical 1.0% max 0.5% typical ±1° max
Velocity Input/ Velocity Output
Tracked Broadband Phase
0.5% typical 1.0% max 0.5% typical ±1° max
Velocity input/Displacement Output
Tracked Broadband Phase
0.5% typical 1.0% max 0.5% typical ±1° max

(1)Analog Outputs are programmable as 0-X volt signals proportional to assigned measured values where X can be up to 10 volts.
(2)With optional Remote Charge Converter
(3)Accuracies are % of FSR.


The following are the key features of the PBS-4100 PLUS:

  • Built in diagnostics and self-calibration – reduce maintenance costs with no downtime
  • Saves money, fuel, time, and improves machine availability
  • Large color front panel display for easy viewing
  • Proven color, graphical user interface with touch screen for easy and reliable operation
  • Touch-screen interface for easy and fast operation
  • Up to 4 vibration channels and 3 speed channels for comprehensive machine testing
  • Dual Pentium processors for blazing speed - you won’t miss any data
  • Balance Wizard for easy and accurate trim balancing at the touch of a button
  • Complete cable sets and connection accessories for all engine and aircraft types

The latest generation PBS-4100 PLUS system from MTI can work for you. With test parameters and connection kits available and proven for all types of engines, the PBS-4100 PLUS system is a very useful engine maintenance tool. Whether users have a single aircraft or a large fleet with a range of aircraft/engine combinations, this system will quickly repay their investment by providing faster solutions to vibration problems and considerably reducing expensive engine removals.


The PBS-4100 PLUS is used in:

  • Military aviation
  • Commercial aviation
  • Corporate aviation
  • Regional Airlines
  • Engine manufacturers
  • Industrial plants maintenance
  • Support & field service personnel
  • Machine development testing
  • Machine overhaul and acceptance testing
  • Trim balancing
  • Vibration diagnostics
  • Independent vibration consultants

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