Figure 3-21 - Main Cdi Test - Garmin GNS 480 Installation Manual

3.3.1.1.2 CDI Deviation Test
The CDI TEST page allows testing of the CDI deviation outputs for both the Main and Auxiliary CDI
outputs. While on the TEST menu page, press the CDI TEST line select key to display the CDI TEST
Page. Press the SELECT line select key to toggle between MAIN and AUX CDI deviation tests. The
MAIN CDI test screen is shown in Figure 3-21, and the AUX CDI test screen is identical.
When on the appropriate page turn the large, outer knob to select the desired CDI deviation test. The test
is initiated as soon as it is selected. There are five CDI tests in the following order:
•
CDI TRIANGLE TEST: gradually drives the CDI needle left and then right.
•
CDI LEFT TEST: drives the external CDI needle full scale left (i.e. output set to 150 mV left).
•
CDI MID TEST: drives the external CDI needle to the center (i.e. output set to 0mV).
•
CDI RIGHT TEST: drives the external CDI needle full scale right (i.e. output set to 150 mV
right).
•
CDI MANUAL TEST: allows manual input of CDI outputs (from 10L to 10R in 15 mV steps,
with 10 corresponding to a full scale output of 150 mV, and 0 corresponding to center).
As a minimum, perform the LEFT, MID and RIGHT tests for the lateral deviation needle of each CDI
connected to the GNS 480.
Press the TEST or BACK smart key to return to the Ground Maintenance Test menu.
GNS 480 (CNX80) Installation Manual560-0982-01 Rev A
Figure 3-21 – Main CDI Test Page
Post-Installation Configuration & Checkout
3-21