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1. Apply power to the ASP-621 display and allow unit to warm up for a minimum of 15
minutes.
2. Connect a known pressure standard to the Pressure and Static ports. Both ports should
be sensing the same pressure. The calibration steps 6 and 7 will be repeated once for each
sensor. The first time is for the Pressure port sensor, and the second time for the Static
port sensor.
3. Press the Exit and Leak Check buttons. The display will change to:
Cal? No Yes
4. Press the Leak Check button to proceed with calibration, or select the Exit button to
exit out of the calibration mode without any changes being made.
5. At this point the display will read:
Goto 0
Feet
Press the Units button to continue.
The display will read:
Pt XXX
In ^ xxx v
Write down the calibration value so it can be re-set if needed!
The In is above the Units button. Press this button when ready to input the selected
correction value, as described in the next step.
6. Using the pneumatics of the test box or an attached pressure standard, go to a pressure
of 1013.25 mBar (sea level pressure of 0 feet), as read from the pressure standard. When
the pressure is stable for approximately 15 seconds, note the pressure displayed on the
ASP-621 display in calibration mode.
If the displayed pressure is lower than the standard, press the Exit button as needed to
incrementally raise the pressure to be equivalent to the standard.
If the displayed pressure is higher than the standard, press the Leak Check button as
needed to incrementally lower the pressure to be equivalent to the standard.
As the pressure is adjusted, note that the displayed correction factor also changes, and the
change is in increments smaller than the pressure. Use this to fine-tune the pressure as
close as you can to the standard.
Airspeed Calibration Procedures
(Pitot sensor and Altitude)
1
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