Signal Conditioning for Rotating Machinery

Obtain valid data in harsh testing conditions with Precision Filters’ state-of-the-art signal conditioners


Testing gas turbine engines and other rotating machines means dealing with a complex set of challenging environmental conditions. Hundreds of sensors and lead wires collect data on pressure, strain, vibration, and temperature while interacting with the extremes of these conditions. Hot gases, magnetic fields, and noise pick-up further complicate the test environment.

A systems approach that combines world-class signal conditioning with fast, rigorous self-testing separates your critical data from the noise and ensures the data is valid. With advanced signal conditioning techniques and equipment, researchers can eliminate electrostatic noise and compensate for resistance and temperature variations in test materials, active gages, and lead wires, while simultaneously recording data from hundreds of sensors. A series of automated sensor and cable health checks means you can be confident in your data.

Precision Filters Developed Balanced Constant Current

Precision Filters developed Balanced Constant Current™ (BCC™) technology to allow for wide dynamic range measurement of strain in harsh environments using only a two-wire connection to the gage. The circuit is insensitive to temperature-induced changes in lead resistance. Because the circuit is balanced, the differential input amplifier rejects noise pickup in the leads. And if a gage terminal shorts to the test article, the circuit continues to measure strain. These techniques have potential applications for many other types of rotating machines, including steam turbines and jet aircraft engines, and materials testing in any extreme environment.

Balanced constant current excitation circuit

Precision Filters’ Systems for Rotating Machinery Testing

The Precision 28000 signal conditioning system is a modular, high performance, highly configurable system that represents the state of the art in gas turbine signal conditioning. Precision Filters offers signal conditioning modules that are fully compatible with National Instruments’ CompactRIO™ and CompactDAQ™ chassis. Either product, when paired with Apex Turbine’s DS control and analysis software, provides a turnkey solution for the challenges of turbine testing.

28000 Signal Conditioning System

Ideal for test cell applications, our versatile 28000 system features built-in NIST traceable self-test for performing annual calibrations and automated pre-test go/no-go tests for run-time system verification. The 28000 includes a complete line of signal conditioners suitable for dynamic or static measurements and able to accommodate any transducer: voltage, charge, static or dynamic strain, as well as bridge-type transducers such as pressure sensors, piezoresistive accelerometers, load cells, and more.

28458 Dynamic Strain Conditioner

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C Series Signal Conditioning Modules

When you need a rugged, portable system, our high-performance C Series signal conditioning modules integrate seamlessly with National Instruments’ CompactRIO and CompactDAQ chassis, making them ideal for in-vehicle installations or installations close to the DUT.

PFI c-Seies Chssis iwth PIF Signal Conditioning Modules

Learn more about the Precision C Series Signal Conditioning Modules