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G. MACH Test and Constant MACH
The DPS1000 can provide either constant CAS “calibrated airspeed” or constant MACH.
The parameter which is held constant is determined by which Target parameter the user
enters as a set point. If the user selects CAS touch zone and enters the Target for CAS
then CAS becomes the controlling parameter for the PITOT (Pt) channel. Similarly, if the
user enters a MACH Target value then MACH becomes the controlling parameter.
With a Target value entered for MACH “i.e. Constant MACH”, once the DPS1000
reaches the Target MACH value, the PITOT (Pt) channel controller will continue to
maintain the MACH value requested while the STATIC (Ps) Target value is changed by
the user entering a different ALT Target.
Note: While operating in constant MACH mode (ie MACH Target set by user) each time
the user changes the ALT Target value you will noticed the equivalent CAS Target
will be automatically computed and updated as the equivalent CAS Target for the
given MACH and ALT Targets requested. You will also notice that when operating
in the constant MACH mode, the CAS Target parameter will be ghosted as a
reminder that CAS is not the controlling parameter during constant MACH mode.
1. If required, from the Main Menu select Display Setup and select ALT, ROC, CAS,
MACH display format.
2. Select Control mode.
3. Wait for Resuming Control to complete.
4. Enter the Target value for MACH.
5. Wait for MACH Target to be achieved.
6. The controller will maintain the MACH target value while the user selects various
ALT target values.
7. On completion of the Constant MACH testing, select Go To Ground and wait for the
Test Set to indicate “Unit is Safe at Ground” to be displayed.
8. At this time hose can be disconnected from the Test Set.
H. AIRSPEED SWITCH TEST
1. If required, from the Main Menu select Display Setup and select ALT, ROC, CAS,
MACH display format.
2. Select Control mode.
3. Enter the Target CAS value below the operating limits of the switch.
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