Section 4.0 Configuration And Calibration; Configuration And Calibration Procedure - Trans-Cal SSD120 M Series Installation And Calibration Manual

Section 4.0 Configuration and Calibration

4.1 Configuration and Calibration Procedure

Overview:
This procedure will allow configuration of the serial ports on the
SSD120-(XX)M to transmit the desired protocol, format and
altitude data resolution.
This procedure will also allow adjustment to the calibration curve
of the SSD120-(XX)M to match the encoder/digitizer output to a
flight altimeter or NIST traceable pressure standard. The maximum
allowed error between the primary flight altimeter and the altitude
digitizer is ±125 feet as required by TSO-C88a. All SSD120-
(XX)M digitizers are calibrated to NIST traceable pressure
standards; however, the error allowed on altimeters at altitudes
above 30,000 feet, can lead to a combined error in excess of ±125
feet between the two instruments. The SSD120-(XX)M utilizes an
externally addressable EEPROM which is configured to accept an
alternate error table communicated to the encoder/digitizer via an
IBM compatible PC.
This procedure assumes the SSD120-(XX)M is installed within an
altimeter referenced to 29.92 In.Hg.(1013.25MB) The technician
must be capable of adjusting the input pressure to run the
encoder/digitizer and altimeter to a stable pressure altitude, and
then enter this altitude into an IBM compatible computer which
will transmit the correction to the digitizer's error table.
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