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6300 Rev H User's Manual
Other details of the calibration procedure are provided in Section 6.
Note: The 6300 must be calibrated only by an authorized calibration facility.
3.10.9
ENCODER
An altimeter-encoder can be connected to the 'Encoder' interface connector on the top panel of the 6300.
The pin-out of the Encoder interface is provided in Appendix C. When an Encoder is connected,
Function '9' shows the 10-bit Gray code that is generated by the Encoder at a specific altitude.
Before selecting Function '9', it is important to set up the 6300 properly. Follow these steps:
a.
Connect the Static output of the 6300 to the encoder's Static port.
b. Close (cap-off) the Pitot port of the 6300.
c.
Set Pitot units to knots and Static units to Feet (or Meters)
d. Set the Static Rate target to a value of 3000 ft/min or less.
e.
Change to Control mode by pressing GND.
f.
Perform a quick leak-check on the encoder at 3000 feet above "Ground".
g. Proceed only if the leak is less than 30 ft/min.
h. Set the Static Target to -1000 feet and GO. Wait for the Actual altitude to be steady at -1000 feet.
Now select Function '9'. The following screen should appear.
The screen shows the 10-bit code recived from the encoder, the flight level equivalent to the code and the
current altitude (which is the same as the altitude shown in the Actual Static value in the Upper section).
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.
125-9106A
Figure 3.52 : Encoder (1)
Page 52
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