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Viavi ALT-8000 Test Note
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Viavi ALT-8000 Test Note

Radio altimeter test procedure
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Test Note
Radio Altimeter Test Procedure Using the
VIAVI ALT-8000/8015
The VIAVI ALT-8000/8015 RF-Based Portable Radio Altimeter Flight Line Test Set allows replication of in-
flight conditions by simulating altitudes, including climb/descend profiles, to verify your installed system and
isolate a bad component.
This document provides the basic instructions to test an installed system. With little editing, it can be easily
adapted to your aircraft platform for formal procedure development.
Contents
ALT-8000/8015 Test Setup ................................................................................................. Page 1
Altitude Simulation Test via Direct-Connect ............................................................................ Page 5
Altitude Simulation Test via Coupler ...................................................................................... Page 7
Profile Test - Direct or Coupler............................................................................................. Page 9
Radio Altimeter Sensitivity Test - Direct or Coupler ................................................................ Page 13

ALT-8000/8015 Test Setup

Radio altimeter: Ensure the aircraft or bench test fixture is energized, however the radio altimeter should be
in the OFF condition.
ALT-8000/8015:
1. Press the Power On button on the front of the ALT-8000 to power on the test set. See Fig. 1-1.
Figure 1-1 Power On Button

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Summary of Contents for Viavi ALT-8000

  • Page 1: Table Of Contents

    Radio altimeter: Ensure the aircraft or bench test fixture is energized, however the radio altimeter should be in the OFF condition. ALT-8000/8015: 1. Press the Power On button on the front of the ALT-8000 to power on the test set. See Fig. 1-1. Figure 1-1 Power On Button...

  • Page 2: Viavi Alt

    4. Connect the cable with the yellow ends (P/N 88511) to the UUT:RX (Yellow) connector on the top panel of the ALT-8000/8015. See Figure 1-3. 5. Connect the cable with the red ends (P/N 89527) to the UUT:TX (Red) connector of the ALT- 8000/8015.
  • Page 3 VIAVI ALT-8000/8015 6. Connect the other ends of the 20 ft cables together, using one of the supplied TNC to TNC Adapters (P/N 38353). NOTE: For the Delay Calibration, the 20 dB attenuators should NOT be installed on the ALT- 8000/8015.
  • Page 4 VIAVI ALT-8000/8015 9. Remove the TNC to TNC Adapter from between the TX and RX cables. 10. Set UUT Settings – UUT Detect Mode to Auto. See Figure 1-4. 11. Set RF Settings – Level Mode to Auto. See Figure 1-4.

  • Page 5: Altitude Simulation Test Via Direct-Connect

    2. Ensure that two of the 20 dB TNC attenuators are connected to the UUT:RX Port (Yellow) of the ALT-8000/8015. Connect one 20 dB attenuator directly to the ALT-8000/8015 and then connect the second 20 dB attenuator directly to the first one. Then connect the coax to these attenuators.
  • Page 6 VIAVI ALT-8000/8015 Figure 2-2 Simulation Screen 8. Ensure Control – Simulation is set to Manual. See Figure 2-2. 9. Set Control – Altitude to 100 ft. See Figure 2-2. 10. Press the Run button to start the altitude simulation. See Figure 2-2.

  • Page 7: Altitude Simulation Test Via Coupler

    1. Perform the ALT-8000/8015 Test Setup instructions beginning on page 1. 2. Ensure that one of the 20 dB TNC attenuators is connected to the UUT:RX Port (Yellow) of the ALT- 8000/8015. Connect the 20 dB attenuator directly to the ALT-8000/8015 and then connect the coax to the attenuator.
  • Page 8 VIAVI ALT-8000/8015 6. Place the UUT:RX (Yellow) coupler over the RX antenna, with the arrow pointing toward the front of the aircraft. NOTE: If the TX antenna coupler is oriented toward the front of the aircraft, then orient the RX coupler toward the front of the aircraft.

  • Page 9: Profile Test - Direct Or Coupler

    Coupler: Locate one of the 20 dB TNC attenuators and connect it to the UUT:RX Port (Yellow) of the ALT-8000/8015. Connect the 20 dB attenuator directly to the ALT-8000/8015 and then connect the coax to the attenuator. Ensure that 20 dB is entered as the Test Setup – Loss –...
  • Page 10 VIAVI ALT-8000/8015 7. Enter a Start Altitude of 100 ft. 8. Enter a Stop Altitude of 100 ft. 9. Enter a Leg Duration of 30 s. 10. Press the Enter button to add Leg 1 to the profile. See Figures 4-2 and 4-3.
  • Page 11 VIAVI ALT-8000/8015 Figure 4-3 Complete Setup 16. Press the Add button and the Add Leg pop-up window will be displayed. See Figures 4-1 and 4-2. 17. Enter a Start Altitude of 500 ft. 18. Enter a Stop Altitude of 500 ft.
  • Page 12 VIAVI ALT-8000/8015 30. Press the Enter button to add leg to the profile. See Figures 4-2 and 4-3. 31. Press the Add button and the Add Leg pop-up window will be displayed again. See Figures 4-1, 4-2 and 4-3. 32. Enter a Start Altitude of 1000 ft.

  • Page 13: Radio Altimeter Sensitivity Test - Direct Or Coupler

    COUPLER: Locate one of the 20 dB TNC attenuators and connect it to the UUT:RX Port (Yellow) of the ALT-8000/8015. Connect the 20 dB attenuator. Ensure that 20 dB is entered as the Test Setup – Loss – Ext. Attenuation – UUT:RX Ext Attenuation value.
  • Page 14 12. Press the Stop button to stop the profile simulation. Contact Us: +1 316 522 4981 avcomm.sales@viavisolutions.com To reach the VIAVI office nearest you, visit viavisolutions.com/contact. © 2019 VIAVI Solutions Inc. Product specifications and descriptions in this document are subject to change without notice. February 22, 2019...

This manual is also suitable for:

Alt-8015