Measurement and Control Range Specifications
© 2015 General Electric Company – All rights reserved. ADTS 405 Mk2 Instruction Manual-English | 101
Rate Control
The ADTS 405 operates in both aeronautical rates and pressure rates, e.g. ft/min and mbar/min and
controls Ps, Pt and Qc parameters in either aeronautical or pressure units.
The following are possible:
Using single vacuum pump, a rate of 20,000 ft/min can be achieved with a volume of 10 litres (600
cubic inches) connected to the static (Ps) channel and 6.7 litres (400 cubic inches) connected to the
pitot (Pt) channel.
Control Response
The required operating pressure value will be achieved without any overshoot, independent of the
system volume, on either Ps or Pt channels. The system response to input commands takes place
within a 400 millisecond period.
Dynamic Testing
The ADTS 405 can generate sinusoidal variations of either the Ps or Pt or both channels. Frequency
and amplitude of the required oscillation can be programmed; external volumes limit the
achievable results. Maximum drift from the mean value during dynamic testing should be no more
than twice that specified for steady state testing.
Control Offset
The displayed value will be within the control stability values for the appropriate channel.
Ps - ft/min or metres/min - max rate 100,000 ft/min
- absolute pressure units/min
Pt - absolute pressure units/min
Qc - kts/min or km/h/min - max rate 2,000 kts/min
- differential pressure units/min
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