Chapter 2 Operation
General Information
22166183 R001 PSD90-3 Universal AC/DC Fuel Quantity Test Set Operation Manual FINAL
April 2023 Subject to Export Control; see Cover Page for details. 2 - 21
2.1 General Information
The PSD90-3 is a general purpose test set and must be used in conjunction with an aircraft
specific interface cable in order to gain access to the aircraft fuel quantity system. Contact
VIAVI for interface cabling information on specific systems.
The following precautions should be observed at all times:
The PSD90-3 battery should be recharged prior to first use and after every subsequent
use. For maximum battery life, the battery should be charged at least once every three
months.
2.2 Power On
• Rotate the POWER/TYPE SELECT switch from POWER OFF to any of the other five
options.
• Upon powering on, the unit automatically runs a self-test.
2.3 Self-test
The following tests are performed on power-up. If a test fails, the appropriate error code is
set:
WARNING
Connect the PSD90-3 chassis jack to airframe ground before making other
connections, and keep connected during all test set operations (measurement and
simulation) unless otherwise specified in aircraft-specific procedures. Disconnect
chassis jack only after all other connections have been discontinued.
WARNING
When using in hazardous environment locations, the PSD90-3 test set should only be
operated from the internal battery. Do not operate on external power in a hazardous
environment.
WARNING
Only connect the PSD90-3 to external power in dry non-hazardous locations.
WARNING
Power cord connection to Front Panel connector must be clean and dry before
attaching. Replace protective cap on the Front Panel connector whenever power cord is
not connected.
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