air data test set mps 30 digital portable user manual - CALIBRATION ...

6.0 DESCRIPTION OF THE HHRCU
MPS 30 User’s Manual DMMC/0803/CM
The HHRCU is composed of two parts: the keyboard and the LCD.
6.1 Display
The writings on the frame surrounding the LCD are valid only for the Operation
mode. The first line, starting from the upper position, is the line of the measured
values. The second line is the line of the target (set) values. The third line is for
pressures (static, pitot, and total). The bottom line shows the Pt/Ps ratio, for the
Mach number and for the unit of measure in use. The columns of the first three lines
are for altitude, airspeed, and altitude rate, respectively.
The four-rows, 20 columns alphanumeric LCD is back-lighted and supports “no
light”, plus four levels of back light intensity. Figure 6-1 shows the HHRCU display in
the operational mode.
6.2 Keyboard
Starting from the top line, the keys are laid out as follows (see diagram or the
HHRCU):
• The LCD UP ARROW key (�) (upper left, first row) to increase the LCD
backlighting intensity level.
• The LCD DOWN ARROW key (�) (upper right, first row) to decrease the
LCD backlighting intensity level.
• AL, AS, and AR, respectively, are for altitude, airspeed, and altitude rate.
These keys are used before the numeric keys to set the desired values.
• The SET key to change the measurement unit.
• The VENT key to reset the ambient pressure in the static and pitot
circuits, to safely disconnect the test lines from the aircraft at the end of
the test.
• The LEFT ARROW key (�)to delete the last digit entered, if it is wrong.
• The MEM key to store data inside the MPS 30 memory.
• The LEAK key to automatically perform the leak test without a stopwatch.
RESUME, written in red at the upper right of the key, is used to restore
the previous condition and must be used after the RED SHIFT.
• The MENU key to switch from the Operative display to the Limits display.
• The MEAS key to stop the control of pressure for measuring the
parameters without the interference of the pressure control system. This
key may be considered the “panic button” to quickly stop the operation of
the unit.
Issue Aug. 03 D. Marchiori PROPRIETARY INFORMATION - 14
This material not to be disclosed or reproduced.