Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | 1
Calibration Process
1. Introduction
The ADTS
403/405 incorporates an automated calibration facility providing three different
calibration functions. A calibration enable switch, located on the front panel under a label protects
the calibration facility. For the ADTS to stay accurate, a calibration check should be carried out at
chosen intervals. If the accuracy of the ADTS is not within the specification, carry out a main
calibration.
1.1 Calibration Process
The automated calibration facility contains three functions:
•
Calibration check
•
Main calibration
•
Rate calibration
The options for the calibration check and main calibration are:
•
Ps (static) channel - absolute calibration.
•
Pt (pitot) channel - absolute calibration.
•
Ps and Pt (combined) channels - absolute calibration.
The combined static and pitot channel calibration provides a quick calibration method that
minimizes errors between static and pitot due to the calibration standard non-repeatable errors.
1.2 Calibration Description
1.2.1 Calibration Check
This is used to check the calibration without adjusting it. It may be used either to see if the ADTS
requires a calibration or to verify performance following a main calibration.
Three options are available for main calibration and calibration check:
a. Ps channel - absolute calibration.
b. Pt channel - absolute calibration.
c. Combined Ps and Pt channels - absolute calibration.
The combined Ps and Pt calibration is the quickest to perform and minimizes errors between Ps
and Pt due to calibration standard uncertainties.
The calibration can be performed with the ADTS
403/405 as the pressure source or by using a
pressure standard as the pressure source. The recommended method is to use the ADTS as the
pressure source as this is the normal mode of operation of the equipment.
1.2.2 Main Calibration
The main calibration adjusts the accuracy of the main transducers. The procedure applies known
pressures to the ADTS and then entering the exact applied pressure using the hand-terminal or
local key-pad. After all calibration points have been entered, the ADTS automatically calculates
the necessary offset (zero) and slope (span) corrections.
The date of this procedure is logged and displayed during the power-up routine.
1.2.3 Rate Calibration
This function aligns the control transducers with the main transducer to ensure accurate rate
control. Rate calibration does not affect the pressure measurement accuracy.
1.3 IEEE
488 SCPI Interface
Calibration facilities are also available over the IEEE
488 SCPI interface. These comprise the
following:
Summary of Contents for ADTS 403F
Page 1: ...Druck com ADTS 403 405 R F Air Data Test System Calibration Manual...
Page 2: ......
Page 8: ...Copyright 1996 Baker Hughes Company vi ADTS 403 405 Calibration Manual English...
Page 10: ...Copyright 1996 Baker Hughes Company viii ADTS 403 405 Calibration Manual English...
Page 39: ......