56-101-01175 Revision H Page | 30
C. In the final step of the Power ON initialization process, the Test Set will equalize the internal
pneumatic pressures contained within the internal DPS1000 manifold and control vessels
to ambient. When this process has completed, the Test Set will then be vented to ambient
pressure, which will appear on the display..
D. At this time the Test Set is ready for the hoses to be attached to the PITOT (Pt) and
STATIC (Ps) ports.
E. As mentioned earlier, it is standard practice and highly recommended to perform a Test Set
Leak Test.
It is preferred that the complete aircraft hook-up configuration be assembled with all hoses
and manifolds to result in the most comprehensive leak test of all components prior to
attaching adapters to aircraft ports. Install plugs/caps in place of each Nav-Aids to allow
leak testing of the hoses, fittings and manifold if applicable.
At a minimum, perform the leak test with the hoses attached to the Test Set and with the
other end of the hoses capped.
This process will provide the most accurate leak test results and allow the user to establish
a baseline regarding the leak rate of the Test Set and hose combination prior to interfacing
with the aircraft or instrument under test.
6. OPERATING MODES
A. The DPS1000 has two pneumatic control modes of operation, (1) the default mode: 2-
channel (Ps & Pt) mode and (2) 1-channel: Pt-Only mode which the user can select by
following this Menu sequence: Main Menu, Page 2, Additional Functions, Control
Mode.
B. The DPS1000 when powered ON after the initialization process has completed will
always be configured into the default 2-channel (Ps & Pt) mode. The 2-channel mode is
by far the most common configuration used while working with aircraft Pitot- Static
systems and Aeronautical instruments. In the 2-channel mode, the STATIC (Ps) port is
used to both measure and simulate the ALT, pressure altitude equivalent pressures
while the PITOT (Pt) port is used to measure and simulate the CAS “calibrated airspeed”
equivalent pressures. At all times, the displayed value for pressure altitude “ALT” (ft or
m) is computed based on a Baro setting of 29.9213 inHg (1013.25 mb).
Note: The Baro setting value cannot be changed.
C. The Pt-Only mode can be used to drive an Airspeed or MACH indicator that has its
STATIC (Ps) port left vented to ambient (local barometric pressure). When the single
channel Pt-Only mode is selected the DPS1000 will perform a Go To Ground function
before transitioning into this mode to ensure the Test Set Ps port is at ambient
barometric pressure, and at the conclusion of the Go To Ground function the Test Set
will leave the STATIC (Ps) port vented to ambient pressure while driving the PITOT (Pt)
port to the Target pressures specified by the user.
D. Below are examples of the 2-modes:
1. Default: Aeronautical 2-Channel (Ps&Pt) ( Figure 19)
2. Aeronautical 1-Channel (Pt Only) ( Figure 20)
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