K114 Issue No. 9
Reference and Specification
6 - 40
Control Performance
Stability
The ADTS 405 provides stable pressure values at the outlet ports and continues to
control smoothly without oscillation into volumes of up to 17 litres (1,000 cubic inches)
on Ps and a volume of up to 10 litres (600 cubic inches) on Pt at rates up to 6000 ft/
min. Lower volumes enable higher rates of change to be achieved.
The following are the figures based on a 40 ppm of Ps full-scale or Qc full-scale over a
bandwidth of 0.1 to 1.5 Hz and using RMS values. Below are shown the two Qc ranges
used by the ADTS 405.
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:
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
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.
LENNAHC YTILIBATSRELLORTNOC
sP
rabm553,1
gHni04
rabm830.0±
gHni1100.0±
cQ
rabm007,1
gHni05
rabm540.0±
gHni4100.0±
cQ
rabm
005,2
gHni47
rabm070.0±
gHni1200.0±
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