Typical chassis dynamometer test bay example.

"This is a generic test-bay layout showing many of the components needed to build a high-end chassis-dyno facility."

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Eddy-Current Controller: Eddy-current dynamometers are the most cost effective loading devices available for chassis testing. They offer an affordable way to build your own, state-of-the-art, industrial-duty dynamometer.
Air Compressor: Air-compressor and storage tank provide regulated air for pneumatic service tools and other equipment - in both test cell and general shop. Locating compressor in sound-proof cell reduces shop noise.
Exhaust Hoses: Double-wall stainless or silicone exhaust piping route heat, noise, and dangerous fumes outside of test bay. Wall pass throughs should incorporate hinged rain caps, to keep weather and rodentes out.
Load Control Valve: Manual or electronic servos valves control the absorber's fill level (loading) during testing. Automated valves allow for convenient, one-handed throttle operation, even during complex automated dynamometer test sessions.
LCD Display: Large screen monitor shows real-time DYNO-MAX screens and post-test reports – to operator and any spectators.
Axle-Hub Dynamometer Module: Eddy-current absorber equipped axle-mounted dyno units.
Sub-Floor Raceway: Covered trenches allow routing air lines, wiring, plumbing, sump drains, etc. from pit to wall areas. Panels or grates allow easy access for maintenance.
Extractor Fan: Low-volume blower removes "heavy" CO and fuel-vapor fumes. PVC pipe runs from bottom of dynamometer pit to roof or exterior wall. Tiny fan motor runs 24/7 to prevent buildup from sources outside of immediate test bay.
Cooling Fan: High-volume fan moves lots of air to help keep radiator and exhaust temperatures in check during stationary vehicle testing.
Floor Anchors: D-ring floor-anchor plates should be placed strategically around dynamometer frame to allow appropriate strapping of vehicles to be tested. Anchoring methods depend on floor material, anticipated loads, and fastener design.
Parabolic Mirrors: Curved mirrors help operator see into test-bay blind spots. They can often help prevent a catastrophe.
AC Drive:

Regenerative AC-motor drive supports ACtiveSync™ option on DYNOmite Axle-Hub Dynamometer modules. Much larger drives are used for totally AC-absorption four-quadrant chassis dynamometers.
PC Cameras: Networked cameras provide extra control-room eyes, with optional recording, into test cell activities. Spot problems before they happen!"
Sound-Bloc Wall: Sound-absorbing acoustical-lined chambers in thick (8"-12") concrete block and sand-filled cores, provide great sound attenuation, reduced echoing and excellent fire rating.
Windows: Sound-rated windows feature multiple panels of thick (1") laminated fire-rated safety glass with solid-concrete filled steel frames. Fill all air (sound) passages with high-density sealant.
CO Detector: Carbon monoxide alarm digitally monitors the cell's CO levels and sounds an alarm above safe limits. Place low to floor for earliest warnings against dangerous exhaust leaks.