Curtiss-Wright D51600, Руководство по эксплуатации и калибровке

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PIM 417-O
PITOT-STATIC LEAK TESTER TYPE D51600
Issue 5
November 2009
Page 28
B. Press the SEL key twice to select Maintenance Menu 3, CALIBRATION. The screen prompts for a
password (
Figure 20
). The password is a 4-digit number and four asterisks are displayed; the first
of which (reading from the left) is shown flashing. Use one of the +/ - keys to change the first
asterisk (*) to a digit then use them to raise or lower the digit to the correct value. Press SEL. The
cursor moves to the second digit which starts flashing. Using the +/ - keys enter the second digit.
Repeat for the remaining two digits. If the wrong password is entered, the caption 'INCORRECT
PASSWORD' is shown momentarily before the screen reverts back to that shown in
Figure 21 .
Figure 21 Password Entry
C. Press the START key. The screen displays the first Set Point for calibration (
Figure 22 ). The value
displayed for the 'current' pressure should be zero but will vary, depending on whether there! is
any pressure residue in the system.
Figure 22 Calibrating at First Set Point
D. There are five calibration Set Points: -340 mB, -170 mB, 0 mB, 170 mB, and 340 mB.
E. Set the Pressure Controller to generate a pressure of -340 mbar. Allow the Controller to stabilise at
the control point.
F. When the pressure has stabilised, make a note of the PSLT reading, e.g. 'Currently -338.7 mB', if
required for any calibration records. Any record made is purely for the Operator's benefit since
correction of the transducer is carried out automatically by the PSLT.
G. Press the START key on the PSL T. The PSLT automatically calibrates and corrects the pressure
at the Set Point such that the pressure displayed on screen changes to read 'Currently -340.0 mB'.
NOTE: The PSL T system is protected against too great a Set Point pressure change
being made in a single step. If the pressure is accepted, the screen will change to
display 'START set * '.