A Databus cable bundle consists of a main Bus line as well as several Stub lines to which different aircraft equipment is connected: on-board computers, temperature probes, navigation system, "friend-foe" identification, weaponry, etc. The signal that circulates through the cable bundle transmits the operational command to the different equipment.
The test equipment developed by Axon' successively checks all the Stub lines of the harness and in particular the following electrical characteristics: attenuation, polarity (phase), transformer resistance, presence of a short circuit between the pairs and the shielding mesh.
The portable test equipment consists of three elements: a signal generator, a recording base, and a calibration kit. The latter allows confirmation that the equipment is functioning correctly before performing the test measurements.

The generator is connected to the main Bus line and injects a signal into the harness.
Compared to other standard test equipment, Axon's equipment works with a sinusoidal signal instead of pulsed waves. This technique allows for a much more precise measurement.
At the same time, the generator sends (via wireless HF 433 MHz) information to the measurement base about the characteristics of the emitted signal.
The measurement base will take this information into account to analyze the quality of the signal received on the Stub line where it is connected.

The metering station is connected sequentially to all subscriber lines. Thanks to the embedded PC running Windows XP, the station analyzes the received signal. A measurement takes only 10 seconds for each subscriber. The test result is displayed on the 8.4-inch touchscreen.
Two USB ports allow you to export this information to a printer or save it as an *.html file. The measuring base can also be connected to a local Ethernet network to download and read the test files.

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