6600-NG User’s Manual
125-9110A
Page 65
If the 10-bit code does not match a valid flight-level, then the flight level is shown as ‘
xxx
’. The flight
level is placed directly beneath the actual altitude so that it is easy to compare them and determine if they
match.
To change the Target Altitude, press ‘
6
’ (this is allowed since the key-number symbol ‘
6
’ is placed to the
right of the Altitude Target in the Upper section). The screen will appear as below.
Figure 3.50 : Encoder (Target Altitude entry)
Enter a new target altitude (which will appear blinking in the Ps1 Target field in the Upper section), then
press
GO
. It is also possible to jog the current target (up or down) using the arrow keys. Similarly, the
altitude rate target can also be changed or jogged, if necessary.
The ideal way to test an encoder would be to start at -1000 feet, with an altitude rate of about 3000
feet/min. Check the encoder output at -1000 feet, then set the target altitude to the maximum altitude of
the encoder. As the Actual altitude moves up, the flight levels will change and it will be easy to see if
they match the altitude within the expected +/-50 ft band. If necessary, reduce the altitude rate. If a
discrepancy is noticed, or an invalid code (‘
xxx
’) is received, change the target altitude to examine the
error more thoroughly. Otherwise, allow the test to continue until the final target altitude is reached.
Note: The power supplied on the Encoder interface connector of the 6600-NG is +12 Volts DC. If the
encoder being tested requires a different voltage, it will need to be supplied externally. If this is done,
the Ground of the external power supply must be connected to the Ground (GND) pin of the Encoder
interface connector. (See pin-out details in Appendix C).
3.11
BATTERY OPERATION
If the 6600-NG has been supplied with an (optional) battery, the battery will be capable of operating the
6600-NG for up to 8 hours.
The battery can be recharged simply by connecting AC power to the 6600-NG and turning On the AC
On/Off switch. It is not necessary to turn On the Battery On/Off switch during charging.
Internal fans and ventilating fans will operate during the charging process. The red “Charging” LED will
turn On. When this LED turns Off, it indicates that the charging is complete. Typically it requires 10 to
12 hours to recharge a fully-discharged battery.
Note: The internal charger will not recharge the battery if the ambient temperature (inside the tester)
is below 0
o
C. If the 6600-NG is equipped with heaters, these will operate to bring the internal
temperature above 5
o
C before the charging is started.
Encoder
A1 A2 A4 B1 B2 B4 C1 C2 C4 D4 Altitude: -1000 Feet
0 0 0 0 0 0 0 1 0 0
Flt level: -10
Target Altitude: Feet
Use arrow keys to jog target value
Press
CANC
to exit
