CM170407AMA
SECTION 5 START UP PROCEDURE
•
Place the MPS49 with the panel face up.
•
Check that the VENT/SEAL valve on the case, if present, is in the “VENT” position.
•
Connect the power cord to the military style connector on the front panel.
NOTE
when using 28V DC power supply, use cable “CBL110929GPA”
only
.
•
Leave static, pitot and AoA lines disconnected. All lines should be connected only after
start-up is completed and the test set is at ambient pressure.
•
Turn the power toggle switch to “ON”.
•
The MPS49 display will first show a DMA logo; followed by the serial number of the unit
and last calibration date.
When the start-up and self-check is completed, there are two possible scenarios:
1. If the altitude measured in the static line is less than 8,000 ft above QFE, then the
MPS49 will automatically vent the pitot, static and AoA lines to ambient. When the
venting process is completed, the display will read: "Ambient pressure reached".
After this message is displayed, press the
MEAS
,
CNTR
or
HALT
key and start
operating the unit.
2. If the altitude measured in the static line is greater than QFE + 8,000 ft, the following
conditions will be automatically imposed:
•
the Commanded Altitude will be set to the value measured in the static line,
•
the Commanded Airspeed will be set to the value measured in the pitot line,
•
the Commanded Altitude Rate will be set at a fixed value (normal default 3,000
ft/min),
•
the Commanded AoA will be set to the value measured in the AoA line.
The Operator is then able to change the commanded values into suitable test points
for the UUT and press
CNTR
to set the ADTS to CONTROL mode, or to return to
ambient conditions.
NOTE
The reason for providing two start-up modes is to ensure that, in “normal” condition,
the ADTS allows the Operator to connect the units under test right after start-up. On
the other hand, when the altitude is found to be high, it is assumed that an
interruption occurred, such as a power failure, and the Operator would like to
resume the test, instead of returning to ambient pressure.
To vent the MPS49 and zero the airspeed/Qc and AoA lines, press the
VENT
(i.e.
SHIFT
+
LEAK
) key.
Again, wait until "Ambient pressure reached" is displayed, then press the
MEAS
key to
enter MEASURE mode.
NOTE
For maximum accuracy of AIRSPEED measurements at low airspeed, refer to
chapter 7.4.2.
D.Marchiori Copyright
25