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Chapter 6. REFERENCE AND SPECIFICATION
6.2.37 SETUP, ALT (Figures 6-5 and 6-6)
This function allows the altitude correction value to be changed. If altitude correction is in use the
display shows, after warm-up, "A/C" in the lower right hand corner. The altitude correction facility
corrects for the pressure difference when the ADTS 405 and the aircraft system are at different
heights.
The ADTS 405R altitude reference level is marked on the front panel just to the left of the Status
LED (assumes front panel is vertical). The ADTS 405F altitude reference level is marked on the side
product label of the flightline case (assumes front panel is horizontal). If the ADTS is below the
aircraft system, enter the correction value as a positive number.
a.
Enter the height difference between the aircraft system and the ADTS 405 altitude
reference level. The units of entry are the current units or default aeronautical units, see
CONFIG, [UNITS], [AERONAUTICAL].
6.2.38 SETUP, SPEED, [AUTO ZERO]
This function enables or disables the auto zero function. When enabled, this optimizes airspeed
accuracy at low airspeeds.
1.
When enabled the ADTS 405 performs an auto zero when the following conditions are met:
• Ps and Pt pressures are stable.
• If in control mode, a zero airspeed or Qc aim has been achieved.
• If in leak measure mode, the airspeed is less than 20 knots (or Qc equivalent).
2.
The auto zero will be initiated within one minute of achieving a new aim value and
thereafter, every five minutes.
3.
The auto zero sequence can be interrupted at any time by entering a new command over
the key-pad or option interface. The controllers must be in measure mode when enabling
or disabling auto zero.
6.2.39 SETUP, SPEED, [CAS/TAS]
1.
This function changes the airspeed display between Calibrated Airspeed (CAS or Vc) and
True Airspeed (TAS or Vt). For testing purposes, CAS is equivalent to Indicated Airspeed
(IAS).
2.
The value of TAS displayed depends on the Pt temperature, see SETUP, SPEED, [Pt
TEMPERATURE].
86 | ADTS 405 Mk2 Instruction Manual-English
© 2015 General Electric Company – All rights reserved.
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