K114 Issue No. 9
6 - 17
Druck ADTS 405 User Manual
6
If the selected set of limits result in the measured pressures being outside the limits, the
display shows the warning message “OUTSIDE LIMITS GO TO GROUND” the Ps and Pt
channels should be taken to ground or to pressures within the new selected limits. This
warning message is also displayed if the pressures measured directly after power-up are
outside the limits used at power-up.
After selecting a set of limits, the altitude correction value can be changed using
SETUP, ALT. The maximum Mach limit can be changed or switched off using SETUP,
MACH.
SETUP, [OSC]
The ADTS 405 has an oscillation facility that causes the pressure to oscillate about the
aim value at a user defined frequency and amplitude.
Select oscillation channel Ps or Pt.
Select [AMPL/FREQ] and enter the required amplitude and frequency.
Select [START] to start oscillation.
Select [STOP] to stop oscillation at the end of a half cycle.
Select [FREEZE] to stop oscillation immediately.
SETUP, [MORE], [CONTROL], [Ps Pt DUAL]
Dual channel is the normal mode of operation where both Ps (static) and Pt (pitot)
channels are connected to the unit or aircraft system under test.
To test instruments such as airspeed indicators with only the Pt (pitot) channel
connected, use SETUP, [MORE] [CONTROL] [Ps Pt DUAL] and select [Pt].
When using [Pt ONLY], the blanking cap must be removed from the Ps (static) channel
so that Ps is open to atmosphere. All the functions associated with the Ps channel are
disabled.
Similarly, to test instruments such as altimeters with only Ps (static) channel connected,
use SETUP, [MORE] [CONTROL] [Ps Pt DUAL] and select [Ps]. All the functions
associated with the Pt channel are disabled; the blanking cap can remain fitted to this
channel.
To return to dual channel operation, select SETUP, [MORE], [CONTROL] [Ps Pt DUAL] and
select [DUAL] and connect both channels to the unit or aircraft system under test.
The channel controllers must be in measure mode when changing [CONTROL].
The Ps (static) pressure must be within ±10 mbar of the recorded QFE to select Pt only.
The control channel selection can be locked in CONFIG.
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