Druck ADTS 403R Use and care manual

Druck.com
ADTS 403/405 R/F
Air Data Test System
Calibration Manual

Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | i
Introduction
This technical manual provides calibration instructions for the Druck ADTS 403/405 Air Data Test
Systems.
Scope
This technical manual contains the calibration instructions for the calibration technician of this
equipment series.
Software
This technical manual applies to software DK 127 version 4.20+, DK 263 version 6.0+, DK 415
version 1.03+.
Safety
The manufacturer has designed this product to be safe when operated using the procedures
detailed in this manual. Do not use this product for any other purpose than that stated.
This publication contains instructions that must be followed to make sure safe operation and to
maintain the equipment in a safe condition. The safety instructions are either warnings or cautions
issued to protect the user and the equipment from injury or damage.
Use qualified* personnel and good engineering practice for all procedures in this publication.
Pressure
Do not apply pressure greater the maximum safe working pressure to the equipment.
Maintenance
The equipment used with this software must be maintained using the manufacturer’s procedures.
Maintenance should be carried out by authorized service agents or the manufacturer’s service
departments.
Technical Advice
For technical advice contact the manufacturer or subsidiary.
* A qualified technician must have the necessary technical knowledge, documentation, special test
equipment and tools to carry out the required work on this equipment. For procedures in Section 5
(Calibration using the IEEE 488 interface) a qualified person must be trained and qualified in both IEEE 488
communications and test programming.

Copyright 1996 Baker Hughes Company.
ii | ADTS 403/405 Calibration Manual–English
Symbols
Symbol Description
This equipment meets the requirements of all relevant European safety directives. The
equipment carries the CE mark.
This symbol, on the equipment, indicates a warning and that the user should refer to the
user manual.
Ce symbole, sur l'appareil, est un avertissement qui indique que l'utilisateur doit consulter
le manuel d'utilisation.
This symbol warns the user of the danger of electric shock.
Ce symbole alerte l’utilisateur sur le danger de choc électrique.
Do not dispose of this product as household waste. Use an approved organization that
collects and/or recycles waste electrical and electronic equipment. For more information,
contact one of these:
- Our customer service department: Druck.com
- Your local government office.
WARNING Turn off the source pressure and carefully vent the pressure lines
before disconnecting or connecting the pressure lines. Proceed with care.
Only use equipment with the correct pressure rating.
Before applying pressure, examine all fittings and equipment for damage.
Replace all damaged fittings and equipment. Do not use any damaged fittings
and equipment.
Do not exceed the maximum working pressure of the instrument.
RISK OF ELECTRIC SHOCK The ground lead of the instrument must be
connected to the AC supply protective safety ground.
Isolate the power supply before making any electrical connections.

Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | iii
Associated Documents
Abbreviations
The following abbreviations are used in this manual; the abbreviations are the same in the
singular and plural.
Document Title
K0114 ADTS 405 User Manual
K0242 ADTS 401 Operator’s Manual [software version 4.20 to 4.29]
K0243 ADTS 401 Operator’s Manual [software version 4.31 to 4.39]
K0285 ADTS 403 User Manual
K0154 ADTS 405 IEEE 488 Option User Manual
K0157 ADTS 405 SCPI User Manual
Abbreviation Description
A Ampere
abs Absolute
AC Alternating current
ADTS Air data test system
ALT Altitude
ARINC Aeronautical Radio Incorporated
ASCII American Standard Code for Information Interchange
ATE Automatic test equipment
CAS Calibrated airspeed
e.g. For example
etc. And so on
Fig. Figure
ft Foot
g Gauge
hPa Hecto Pascal
Hz Hertz
i.e. That is
IEEE 488 Institute of Electrical and Electronic Engineers standard 488 data
in Inch
inHg Inches of mercury
inH2O @ 4°C Inches of water at 4°C
inH2O @ 20°C Inches of water at 20°C
kg Kilogram

Copyright 1996 Baker Hughes Company.
iv | ADTS 403/405 Calibration Manual–English
Glossary
The terminology used in this manual is specific and individual interpretation must not be
introduced. The terms are defined as follows:
LSU Line Switching Unit
m Metre
mA Milliampere
max Maximum
mbar Millibar
min Minute or minimum
mm Millimetre
mmHg Millimetre of mercury
mV Millivolts
No. Number
Pa Pascal
PC Personnel computer
Ps Pressure static
psi Pounds per square inch
Pt Pressure Total (Pitot)
P/W Password
Qc Differential pressure
SCPI Standard commands for programmable instruments
TAS True airspeed
TPM Test program manager (Druck software package)
V Volts
+ve Positive
-ve Negative
°C Degrees Celsius
°F Degrees Fahrenheit
Item Description
Adjust To bring to a more satisfactory state; to manipulate controls, levers, linkages, etc. to return
equipment from an out-of-tolerance condition to an in-tolerance condition.
Align To bring into line; to line up; to bring into precise adjustment, correct relative position or
coincidence.
Assemble To fit and secure together the several parts of; to make or form by combining parts.
Abbreviation Description

Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | v
Calibrate To determine accuracy, deviation or variation by special measurement or by comparison
with a standard.
Check Make a comparison of a measure of time, pressure, temperature, resistance, dimension or
other quality with a known figure for that measurement.
Disconnect To detach the connection between; to separate keyed or matched equipment parts.
Dismantle To take apart to the level of the next smaller unit or down to all removable parts.
Examine To perform a critical visual observation or check for specific conditions; to test the condition
of.
Fit Correctly attach one item to another.
Inspect Review the work carried out by Specialists to ensure it has been performed satisfactorily.
Install To perform operations necessary to properly fit an equipment unit into the next larger
assembly or system.
Maintain To hold or keep in any particular state or condition especially in a state of efficiency or
validity.
Make sure To confirm that a proper condition exists; to find out with certainty.
Operate Ensure that an item or system functions correctly as far as possible without the use of test
equipment or reference to measurement.
Readjust To adjust again; to move back to a specified condition; to bring back to an in-tolerance
condition.
Reconnect To rejoin or refasten that which has been separated.
Refit Fit an item which has previously been removed.
Remove To perform operations necessary to take an equipment unit out of the next larger assembly
or system. To take off or eliminate. To take or move away.
Repair To restore damaged, worn out or malfunctioning equipment to a serviceable, usable or
operable condition.
Replace Remove an item and fit a new or a serviced item.
Reset To put back into a desired position, adjustment or condition.
Service To perform such operations as cleaning, lubricating and replenishing to prepare for use.
Test Ascertain by using the appropriate test equipment that a component or system functions
correctly.
Item Description

Copyright 1996 Baker Hughes Company.
vi | ADTS 403/405 Calibration Manual–English

Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | vii
Contents
1. Introduction 1
1.1 Calibration Process 1
1.2 Calibration Description 1
1.2.1 Calibration Check 1
1.2.2 Main Calibration 1
1.2.3 Rate Calibration 1
1.3 IEEE 488 SCPI Interface 1
1.4 Equipment Specification 2
1.5 Media Compatibility 2
1.6 Preliminary Operations 2
1.6.1 Pressure Source 2
1.7 Notes on Calibration 3
2. Leak Test 5
2.1 ADTS Leak Test 5
2.2 Purge and Leak Test 5
3. PIN Protection 7
4. Calibration 9
4.1 Enter Calibration Mode 9
4.2 Calibration Check 9
4.3 Calibration Check of the Static Channel 10
4.4 Calibration Check of the Pitot Channel 10
4.5 Calibration Check of the Combined Pitot and Static Channels 11
4.6 Main Calibration 12
4.6.1 To Operate Calibration Switch 12
4.6.2 Pressure Source 12
4.6.3 Select Calibration Mode 13
4.7 Calibration and Adjustment of the Static Channel 14
4.8 Calibration and Adjustment of the Pitot Channel 15
4.9 Calibration and Adjustment of the Combined Static and Pitot Channels 16
4.10 Completion 16
4.11 Rate Calibration 16
5. Calibration using IEEE 488 SCPI 19
5.1 Automatic Calibration 19
5.1.1 Offset, Slope and Curve Fit Adjustment 19
5.1.2 Computer Algorithm for Offset, Slope and Curve Fit Adjustment 19
5.2 Defining Elements for a Program 20
5.2.1 Terms, Variables and Constants 20
5.2.2 To Find Existing Calibration Data 21
5.2.3 To Find Pressure Errors Between Standard and ADTS 403/405 21
5.2.4 To Decide if Correction Should be Carried Out 21
5.3 Calibration Pressures 23
Appendix A. Quick Reference 25

Copyright 1996 Baker Hughes Company.
viii | ADTS 403/405 Calibration Manual–English

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:

Copyright 1996 Baker Hughes Company.
2 | ADTS 403/405 Calibration Manual–English
Chapter 1. Introduction
• Automatic calibration check and rate calibration as above. These may be performed in either
measure mode or control mode.
• A lower level facility allowing multi-point adjustment of curve fit as well as direct setting of
offset and slope. A computer algorithm provides automation of this process.
1.4 Equipment Specification
Table 1-2 details the specification of the equipment required to perform a calibration.
1.5 Media Compatibility
Refer to Table 1-2 for the permitted pressure media.
1.6 Preliminary Operations
Review and become familiar with the whole procedure before beginning calibration process.
Allow at least one hour for the ADTS to thermally stabilize after switching on and before
calibration.
Before starting a calibration procedure carry out a leak test, see Section 2
To enable calibration, remove the calibration label and, using a 3 mm AF hexagonal key (Allen
key/wrench), turn the captive, calibration screw counter-clockwise until free.
The pressure standard datum level must be the same as the unit datum level. The datum level of
the unit is on the front panel.
1.6.1 Pressure Source
The calibration menu prompts a selection of an internal or external pressure source.
The internal pressure source selection uses the ADTS in the control mode with the pressure
controllers generating the required pressures for calibration. The required aim value and rate of
change of pressure can be entered. A pressure standard connects to the output and measures
the generated pressure.
The external pressure source selection uses the ADTS in the measure mode with a pressure
standard providing the pressure source.
Table 1-1: Calibration Equipment Requirements
Equipment Minimum Specification Purpose
Pressure Standard
(manual or automated)
Range: 27.62 to 3500 mbar
Uncertainty: 32 ppm of reading
+0.007 mbar (0.0032 % of reading
+0.7 Pa)
To compare against ADTS.
Computer (optional) PC equipped with IEEE 488 Interface. Automate calibration by communication
with ADTS and Pressure Standard.
INFORMATION Incorrect use of pressure media seriously affects the
measurement accuracy of the ADTS.
Table 1-2: Media Compatibility
ADTS Pressure Sensora
a. The ADTS pressure sensor type is shown on the LCD display during the power-up self-test sequence.
Permitted Pressure Media
Solartron® Dry air only.
Druck RPT Dry air or dry nitrogen.

Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | 3
Notes on Calibration
1.7 Notes on Calibration
• For optimum calibration accuracy, the ADTS should be connected to the pressure standard
using metal, PTFE or high density polyethylene hoses to avoid contamination of the internal
sensors. This is particularly important when using an EXTERNAL pressure source.
• The ADTS should be allowed one hour to thermally stabilize after power on and before
performing any calibration routines.
• The units of pressure measurement for calibration in the following procedures are mbar.
• Calibration values that exceed the range of a channel will be ignored as a calibration value
for that channel.
• The [END PS] and the closing of the valve prevents the Ps (static) transducer from receiving
an overpressure.

Copyright 1996 Baker Hughes Company.
4 | ADTS 403/405 Calibration Manual–English
Chapter 1. Introduction

Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | 5
ADTS Leak Test
2. Leak Test
2.1 ADTS Leak Test
A leak test should be carried out before a calibration procedure to make sure of the integrity of
the ADTS.
1. Allow one hour for the ADTS to thermally stabilize after switching on and before calibration.
2. Select RATE ALT and a rate of 195 mbar/min. Select RATE SPEED and a rate of
335 mbar/min.
3. Select ALT and enter a new aim point of 1000 mbar. Check that the ADTS attains the new
aim point. Make sure the pressure is stable and within ± 0.1 mbar of the aim point.
4. Select AIRSPEED and enter an aim point of zero. Check that the ADTS is controlling at the
aim point.
5. Enter a new aim point of 1450 mbar. Check that the ADTS attains the new aim point. Make
sure the pressure is stable and within ± 0.1 mbar of the aim point.
6. Select RATE ALT and LEAK TEST. Select START TIMER for a 5 minute wait and a 5 minute
test. Press F3 to start the test.
7. After 10 minutes, the leak rate must be less than 0.5 mbar/min.
8. Select RATE SPEED, the leak rate must be less than 0.5 mbar/min.
9. Select REGAIN CONTROL. Select ALT and enter a new aim point of 75 mbar abs. Check
that the ADTS attains the new aim point. Make sure the pressure is stable and within
±0.1 mbar of the aim point.
10. Select RATE SPEED and LEAK TEST. Select START TIMER for a 5 minute wait and a
5minute test. Press F3 to start the test.
11. After 10 minutes, the leak rate must be less than 0.5 mbar/min.
12. Select RATE SPEED, the leak rate must be less than 0.5 mbar/min.
13. After 10 minutes, the leak rate must be less than 0.5 mbar/min.
14. Repeat (3) to (8) with ALT at 30 mbar and AIRSPEED at zero.
15. Select REGAIN CONTROL. Select GO TO GROUND. Check that the ADTS attains an ALT
pressure of atmospheric, an AIRSPEED value of zero.
16. Select END OF TEST. The ADTS is now ready for calibration.
2.2 Purge and Leak Test
Connect the ADTS to the calibration standard. Use the ADTS calibration check facility to purge
and leak check the ADTS and the calibration standard as follows:
1. Enter the calibration check facility and select the required calibration mode.
2. Apply a vacuum from the calibration pressure source. Maintain for five minutes. Return the
pressure to approximately atmospheric pressure using the calibration media. Do not vent to
atmosphere. Repeat twice more.
3. Apply a suitable pressure, allow to stabilize and leak test the ADTS and calibration system.

Copyright 1996 Baker Hughes Company.
6 | ADTS 403/405 Calibration Manual–English
Chapter 2. Leak Test

Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | 7
3. PIN Protection
A service PIN (Personal Identification Number) can be entered to prevent unauthorized entry into
Calibration or Maintenance Mode.
To change the service PIN:
1. Press 000 when the Main Calibration Menu is displayed:
2. Enter the new PIN.
3. Enter 0000 to disable PIN protection.
(CALIBRATION)
F1 Main Calibration
F2 Calibration Check
F3 Rate Calibration

Copyright 1996 Baker Hughes Company.
8 | ADTS 403/405 Calibration Manual–English
Chapter 3. PIN Protection

Copyright 1996 Baker Hughes Company.
English–ADTS 403/405 Calibration Manual | 9
Enter Calibration Mode
4. Calibration
4.1 Enter Calibration Mode
1. Enter the calibration menu from the measurement or control menu by pressing F1 and F4
together.
2. The service PIN, if enabled protects both calibration and maintenance facilities from
unauthorized entry. If the service PIN is disabled, the display shows the main calibration
menu. To enable or change the service PIN, press the — key then enter the four digit PIN.
Enter 0000 to disable the PIN facility.
3. The date of the last main calibration will be shown for 5 seconds followed by the current date.
If the date is correct then press ENTER. If the date is incorrect then enter all 6 digits of the
current date. The format is shown as either:
i. “(MDY)” (mm/dd/yy)
ii. “(DMY)” (dd/mm/yy)
Press ENTER to accept the new date.
Note: “Unknown” will be shown if the last calibration is not known, after a software update
for example.
4. The following screen then displays:
5. Select the type of calibration to be carried out.
6. Select the pressure source:
7. Select the channel for calibration:
8. Carry out the appropriate procedure in the following paragraphs.
4.2 Calibration Check
The procedure for calibration check is identical to the main calibration procedure except that
[ACTUAL VALUE] is not available and [END CAL] is replaced by [Ps END] which closes a valve
to protect static (Ps). Pressures must be applied in ascending order.
Note: The pitot (Pt) channel is checked in absolute mode, with Auto Zero automatically disabled.
Differential Qc or airspeed accuracy may be checked in normal user mode. For optimum
differential accuracy during these tests, auto zero should be ON. This is particularly significant for
very low airspeed values.
Note: The tolerance quoted in the following tables may need to be adjusted to allow for
measurement uncertainties of the calibration standard in use. The limits stated relate to the
(CALIBRATION)
F1 Main Calibration
F2 Calibration Check
F3 Rate Calibration
Source
F1 Internal
F2 External
F1 Ps Calibration
F2 Pt Calibration
F3 Ps&Pt Calibration

Copyright 1996 Baker Hughes Company.
10 | ADTS 403/405 Calibration Manual–English
Chapter 4. Calibration
published, minimum specification for the equipment entering service. Acceptance limits may vary
at the user's discretion for specific applications.
4.3 Calibration Check of the Static Channel
Before starting this procedure carry out a leak test as detailed in Section 2 Set the unit to
measurement mode, calibration check, external pressure source and static (Ps) calibration as
detailed in Section 4.1.
1. Connect calibration pressure to the static output.
2. Adjust calibration pressure to the first pressure value in Table 4-1.
3. Compare the pressure value on the calibration standard to the value displayed and record
the difference. Press [ENTER] and display prompts for the next pressure value.
4. Repeat (2) and (3) for pressure No. 2 to 8 in Table 4-1.
5. If the recorded difference exceeds the allowable tolerance (a) carry out a calibration
adjustment detailed in Section 4.7.
6. Select F4 [END]. The display goes back to the channel select menu, select another channel
for calibration checking or exit the calibration menu.
7. Adjust calibration standard to atmospheric pressure. Disconnect calibration standard from
the static output.
8. If there is no further calibration or testing required, switch off the unit.
4.4 Calibration Check of the Pitot Channel
Before starting this procedure carry out a leak test as detailed in section 2. Set the unit to
measurement mode, calibration check, external pressure source and pitot (Pt) calibration as
detailed in Section 4.1.
1. Connect calibration standard to the pitot output.
2. Adjust calibration pressure to the first pressure value in Table 4-2.
3. Compare the pressure value on calibration standard to the value displayed and record the
difference. Press [ENTER] and display prompts for the next pressure value.
4. Repeat (2) and (3) for pressure No. 2 to 11 in Table 4-2; points 12 to 13 are used on the 1000
knot Pitot range sensor.
Table 4-1: Static Channel Calibration Pressures
Pressure No. Pressure (mbar) Tolerancea (± mbar)
a. The tolerance quoted in this table may need to be adjusted to allow for measurement uncertainties of the calibration
standard in use. The limits stated relate to the published, minimum specification for the equipment entering service.
Acceptance limits may vary at the user's discretion for specific applications.
1 27.62 0.1
2 72.00 0.1
3 189.00 0.1
4 466.00 0.1
5 697.00 0.1
6 843.00 0.1
7 1013.00 0.1
8 1355.00 0.1