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CHAPTER 4
CALIBRATION PROCEDURES
The recommended calibration interval for the PS-425 is one year. If at any time
during regular use the unit becomes unreliable or out of correct operating calibration, it
must be repaired and/or re-calibrated before continuing its use.
The PS-425 is easy to calibrate. There are 5 set points used in the calibration of the
altimeter. This enables the altimeter to have a greater degree of accuracy, allowing it to
self-correct to the nearest calibrated set point.
The calibration factors are stored in the microcontroller’s EEPROM memory and does
not need battery back-up. The calibration will not be lost when power is removed.
Altimeter Calibration Procedures
1. Apply power to the PS-425 and allow a warm up for a minimum of 15 minutes.
2. Connect a known altitude pressure standard to the Static and Pitot ports, (both ports
connected together, sensing the same pressure).
3. Press the Exit and Leak Check buttons simultaneously. The display will change to:
Cal? No Yes
4. Press the Leak Check button to proceed with calibration, or press 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
This is to notify the technician that the current calibration point is 0 feet (29.92 inHg). To
select a different calibration point, press the backlight button (the button will not activate
the light while in Cal mode).
There are 5 calibration points: 0, 10,000, 20,000, 30,000, 40,000 feet. When the desired
calibration point is displayed, press the Units button.
The first calibration point display will read:
P Altitude (in feet)
In Ç xxx È
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