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CM170407AMA

2. command an altitude value equal to ambient pressure;
3. reach the ambient pressure with controlled rates. Rate values are set as follows:

•

the   altitude   rate   is   set   from   the   Settings   Menu;   refer   to   the   Calibration   and
Adjustments manual for information;

•

the airspeed rate is set to the current maximum airspeed rate limit;

•

the AoA rate is set to the current maximum AoA rate limit.

When the ambient pressure is reached, the message: “Ambient pressure reached” will be
displayed, and the MPS49 will switch to “Ambient pressure reached” mode.

NOTE

the VENT/SEAL valve on the case, if present, must be in the “VENT” position. 

To interrupt the venting procedure, the Operator can press the  

MEAS

,  

CNTR

  or  

HALT

keys.
For more information about the “Ambient Pressure Reached” mode, refer to chapter 4.2.3.
The airspeed value for step 1. is zero knots by default. For more information, refer to the
MPS49 Calibration and Adjustment Manual.

7.4 PRECISION MEASUREMENTS

7.4.1 OPERATION ON LARGE OR VERY SMALL VOLUMES

A precision measurement can only be obtained when the test lines pressures are stabilized.
Even though the stability of the controlled values in the CONTROL mode are very good, the
MEASURE mode should be used whenever a very precise measurement is required.
The   MEASURE   mode  function   should   always   be   used   if   large   test   volumes   are   being
measured, such as with an older aircraft.
On the other hand, if the volumes are very small, the pressure changes could generate
thermal effects that may lead to long settling times.
The suggested procedure to follow in these cases is the following:

1. set the commanded values and wait for the MPS49 to reach them;
2. remain   in  CONTROL   mode  for  some  minutes,   to  allow   the  MPS49   to  “actively”

stabilize thermal effects and other transients;

3. enter MEASURE mode by pressing the 

MEAS

 key;

4. remain in MEASURE mode for some minutes, to allow further stabilization;
5. measure the values;
6. return to CONTROL mode, by pressing the 

CTNR

 key.

7.4.2 DIFFERENTIAL PRESSURE ZERO ADJUSTING AND ULTRA-LOW SPEED FUNCTION

For the most accurate low Airspeed and AoA measurements, it is recommended that the
MPS49   differential   pressure   readings   should   be   zeroed   at   the   start   of   each   new   test
sequence, where a precision airspeed measurement is required. Zeroing ensures the best
accuracy of low airspeed and AoA measurement.
The Altitude channel of the MPS49 is not affected.
Zeroing is accomplished by setting the pressure differential between the pitot and static
lines (or Ps2 and static lines) to zero at the ambient pressure.
The procedure will be activated only at the following conditions:

D.Marchiori Copyright

31

Содержание MPS49

Страница 1: ...a aero com Internet http www dma aero com This Document is the property of D Marchiori s r l and may not be copied or otherwise reproduced communicated in any way to third parties nor stored in any data processing system without the express written authority of D Marchiori s r l D Marchiori Copyright 1 MPS49 AIR DATA TEST SET OPERATING MANUAL ...

Страница 2: ...2 2 4 PRESSURE MEDIA 11 2 2 5 MEASURE UNITS 11 2 2 6 PHYSICAL SPECIFICATIONS 12 2 2 7 ENVIRONMENTAL LIMITS 12 2 2 8 CALIBRATION 12 2 2 9 START UP TIME 12 2 2 10 CONTROL CAPABILITY WITH INTERNAL PUMPS 12 2 2 11 PROTECTION 12 2 2 12 EXTERNAL SUPPLY PORTS 13 2 2 13 OPTIONAL MULTIPLE ISOLATOR FUNCTION 13 2 2 14 ADDITIONAL CONNECTIONS 13 SECTION 3 CONTROL KEYS AND TOUCH SCREEN 16 SECTION 4 CONTROLLED U...

Страница 3: ... OPTION 33 7 6 1 CONFIGURATION 34 7 6 2 DISPLAYING DATA COMING FROM THE ARINC 429 BUS 34 SECTION 8 CHANGING PRESET LIMITS 35 8 1 GENERAL 35 8 2 LOADING AND SAVING LIMITING VALUES 35 SECTION 9 SAFETY MANUAL OPERATION 36 9 1 MANUAL VENT 36 SECTION 10 SPECIAL FUNCTIONS 37 10 1 MACH NUMBER 37 10 2 SETTING DISPLAY BRIGHTNESS 37 10 3 BATTERY LEVEL 37 10 4 CENTER LINE CORRECTION 37 10 5 VALVES FINE TUNIN...

Страница 4: ...1 1 ETHERNET 48 12 1 2 GPIB 48 12 2 WIRELESS CONNECTIONS 48 12 2 1 BLUETOOTH 48 12 2 2 WI FI 49 SECTION 13 SPECIAL FUNCTIONS KEYS SUMARY 50 SECTION 14 CALIBRATION 51 14 1 GENERAL 51 14 2 CALIBRATION SERVICE 51 SECTION 15 ENCODING ALTIMETER CONNECTOR DETAIL 52 SECTION 16 MAINTENANCE RETURN AND DISPOSAL INFORMATION 53 D Marchiori Copyright 4 ...

Страница 5: ...EN 33 FIG 13 THE ENCODING ALTIMETER RESULTS SCREEN 33 FIG 14 THE ARINC SCREEN 34 FIG 15 SCHEMATIC OF THE MANUAL VENTING VALVES 36 FIG 16 STATUS SCREEN SHOWING MACH NUMBER 37 FIG 17 STATUS SCREEN SHOWING TRUE AIRSPEED 38 FIG 18 STATUS SCREEN SHOWING EPR 39 FIG 19 THE MULTIPLE ISOLATOR SCREEN 39 FIG 20 THE SPECIAL MULTIPLE ISOLATOR SCREEN 40 FIG 21 OSCILLATION PARAMETERS 41 FIG 22 THE PROFILE EDITIN...

Страница 6: ...ker Protection Directive EU 99 92 EC Contact DMA for details of the ATEX certification standards applicable to the MPS range of products The following warnings apply to the internal battery do not attempt to invert the connection of the battery do not disassemble crush or puncture the battery do not short circuit the battery if a short circuit is detected or even just suspected remove the battery ...

Страница 7: ... level where fuel vapor could be present for example during re fueling operations The total volume of the pneumatic circuit of the MPS49 is small When no pneumatic load is connected to the ADTS thermal effects could result in apparent leaks The final inspection and calibration procedures indicate rate values and stabilization times that must be followed in order to compensate for thermal effects 1...

Страница 8: ...031 1 9 6 VACUUM AND OVERPRESSURE GENERATION The MPS49 generates vacuum and pressure inside its internal reservoirs for controlling the Static Pitot and AoA lines The pumps only run when needed in order to save power and ensure a longer operational life 1 9 7 28V DC SUPPLY The MPS49 can be optionally powered from a 28V DC power supply option A0 Use only cables marked CBL110929GPA for powering the ...

Страница 9: ...re programmed limits Limiting values are password protected Test profiles can be programmed and automatically executed by the MPS49 The Unit Under Test UUT is safely isolated in the event of any power loss The MPS49 incorporates two internal pump units for pressure and vacuum supplies The pumps only run when required to save power and ensure a longer operating life 2 1 MAIN PARTS The MPS49 main pa...

Страница 10: ...set values the ADTS permits the simple setting of maximum values limits to which the unit can operate It is supplied at the time of delivery with the following default values set by the manufacturer Max altitude 50 000 feet Min altitude 1 500 feet Max airspeed 450 knots Max vertical speed 3 000 feet min Set airspeed rate 300 kt min Max Mach number 1 Max AoA 2 5 inHg Low battery mode allowing only ...

Страница 11: ...0 003 inHg 0 10 hPa Mach number Range from 0 to 6 limited by airspeed range Resolution 0 001 Accuracy 0 002 sea level 2 2 3 POWER 90 to 240 VAC and 50 to 400 Hz Maximum power consumption 120 W Optional 28V DC option A0 with cable CBL110929GPA An internal battery is included providing 2 hours operation Maximum current output from the Encoding Altimeter connector option B7 24V line pins 1 2 300 mA 5...

Страница 12: ...information Stability of the calibration is better than 80 ppm full scale over 2 years 2 2 9 START UP TIME The MPS49 goes through an automatic self test at each power on The equipment is ready for operation about 180 seconds after power on NOTE if the internal heater is installed the start up time could become longer depending on the ambient temperature 2 2 10 CONTROL CAPABILITY WITH INTERNAL PUMP...

Страница 13: ...NCTION The MPS49 can be provided with up to four Ps four Pt and four AoA connections The Multiple Isolator function enables the Operator to individually seal each port to allow advanced leak checking procedures and generation of different pressure levels 2 2 14 ADDITIONAL CONNECTIONS The MPS49 comes equipped with an RS232 port that enables communication with an external PC for remote control Refer...

Страница 14: ...r button 6 Drain valve 7 Drain button 8 Vacuum port 9 Battery compartment 10 Static line outputs 11 AoA line outputs 12 Pitot line outputs 13 Additional communication ports 14 RS232 port 15 Manual vent valves 16 Display 17 Keyboard FIG 2 KEYBOARD LAYOUT D Marchiori Copyright 14 1 2 3 4 5 7 8 6 9 10 11 12 13 15 16 17 14 ...

Страница 15: ...CM170407AMA FIG 3 MPSRC REMOTE CONTROL D Marchiori Copyright 15 ...

Страница 16: ...as targets This actions the stopping of a running test while keeping the control system enabled and actively compensating leaks MEAS sets the MPS49 into MEASURE mode The pressure control system is turned off leaving only the pressure measuring system active This function is used to achieve extra accuracy because it avoids any controller induced effects on the measured pressures CNTR sets the MPS49...

Страница 17: ...s respectively after the vent function has been activated The HALT key interrupts the procedure and returns the MPS49 to CONTROL mode The UP and DOWN triangle keys and are used to increase or decrease the selected parameters altitude airspeed rate etc by a selected value to navigate inside the menus in the Display Screen to adjust the display brightness refer to paragraph 10 2 Numerical keypad The...

Страница 18: ...en controlling pressures the Ps and Qc Pt rates are controlled The display settings are independent from the control mode For instance it is possible to display static pressure while controlling altitude rate The controlled and displayed units can be changed by touching the Eu Au button on the status screen FIG 5 FIG 5 THE STATUS SCREEN AERONAUTICAL UNITS To change the display mode select the alti...

Страница 19: ...he mode where only the pressure measuring system is active and the control system is turned off The unit under test UUT becomes completely isolated from the pressure generator and precise measurements can be obtained when the line pressures in the UUT under test are stabilized Whenever a precision measurement is required in particular when large volumes are involved the MEAS function should be use...

Страница 20: ...to thermal effects 4 2 4 LEAK MODE The LEAK mode initiates the automatic leak test and the internal timer stopwatch measurement feature of the MPS49 While in the LEAK mode the display shows the Leak Screen FIG 7 Entry to the LEAK mode is by pressing the LEAK key If pressed again the LEAK key restarts the leak measurement A leak test can be interrupted with the MEAS CNTR or HALT keys 4 2 5 MODE LIM...

Страница 21: ...ttery status A small diagram displays the battery charge level When the AC is connected the battery is displayed full with a black C up to three colored buttons Their function can vary with respect to the current operational mode The buttons can be activated either by touching them or pressing the SHIFT and one among the 7 8 and 9 keys FIG 6 OPERATIONAL MODE INDICATION WITH AND WITHOUT AOA LABEL 4...

Страница 22: ... FIG 8 which is opened by pressing sequentially the keys SHIFT 3 FIG 8 THE MAIN MENU The Operator can choose one of the displayed options by touching it or by using the and and ENTER keys To exit the menu the Operator can touch the orange button at the bottom of the screen or by pressing the SHIFT 7 keys 4 4 2 VALUE MENUS An example of value menu is the Limits Menu FIG 9 that can be accessed from ...

Страница 23: ... Back button always exits the menu 4 5 SELECTING MEASURE UNITS The MPS49 can display both simulated and commanded values in several measure units The measure units can be changed from any screen featuring the yellow Unit button e g the Status Screen When the Unit button is pressed a choice menu will appear displaying all the measure units for the selected quantity Refer to FIG 10 for an example FI...

Страница 24: ...Status Screen only shows four numbers at a time For example FIG 5 displays altitude airspeed and the corresponding rates As explained in paragraph 4 3 1 the SHIFT and negative keys open a menu that actions a change to visualization Other screens like the Leak Screen paragraph 4 3 2 and the Multiple Isolator Screen FIG 19 automatically enable or disable AoA visualization If the AoA is controlled bu...

Страница 25: ...e is greater than QFE 8 000 ft the following conditions will be automatically imposed the Commanded Altitude will be set to the value measured in the static line the Commanded Airspeed will be set to the value measured in the pitot line the Commanded Altitude Rate will be set at a fixed value normal default 3 000 ft min the Commanded AoA will be set to the value measured in the AoA line The Operat...

Страница 26: ... pressure and corresponding rates and AoA from the Status Screen FIG 5 To enter a Commanded value the corresponding area of the screen must be selected The values can be selected by touching them or with the keyboard and keys The selected commanded values can be changed in two ways entering the new value using the numerical keypad and pressing either ENTER or the or keys when finished to confirm t...

Страница 27: ...orced in Pt control mode 6 3 ACOUSTIC ALARM FUNCTION When the simulated actual values are almost at the commanded target values an acoustic alarm will start sounding beep beep to warn the operator that the MPS49 is approaching the target values The acoustic alarm function can be enabled or disabled from the Settings Menu or by pressing the SHIFT 2 keys The tolerance values are around 10 feet altit...

Страница 28: ... Qc Pt values All kinds of leak tests are enabled by pressing the LEAK key The Leak Screen paragraph 4 3 2 will appear NOTE The leak test can be performed either in aeronautical or pressure units FIG 7 is an example of the Leak Screen in aeronautical units NOTE The pneumatic circuit inside the MPS49 consists of a small volume 0 07 liter for Ps Pt and AoA For this reason any leak test conducted on ...

Страница 29: ...lled 4 list the ports that are leaking more than the pre programmed tolerances NOTE if the Multiple Isolator is not available the leak test will collect information about each line Ps Pt AoA as a whole During the automatic leak test if the Multiple Isolator is installed the lower right corner of the display lists all the ports in different colors Blue if the port was not yet tested Pink if the por...

Страница 30: ...150 knots Airspeed rate 300 knots Stab Time 10 sec Leak test aeronautical Leak stab time 10 sec Leak meas time 10 sec Max alt leak 15 feet min Max airsp leak 1 knots min 6 Touch the orange button Back 7 Touch the green button Save NOTE because the AoA is set to zero any AoA ports will be tested together with the Ps ports as the two lines are connected inside the ADTS To run this test after mountin...

Страница 31: ...ver a very precise measurement is required The MEASURE mode function should always be used if large test volumes are being measured such as with an older aircraft On the other hand if the volumes are very small the pressure changes could generate thermal effects that may lead to long settling times The suggested procedure to follow in these cases is the following 1 set the commanded values and wai...

Страница 32: ... the air speed resolution is increased as described in the following table and the Status Screen displays ULS in the lower left corner Normal Ultra low speed Minimum measured speed with 1 knot resolution 10 knots 2 knots Minimum measured speed with 0 1 knots resolution 20 knots 50 knots As soon as the altitude significantly changes or any other of the above conditions are no longer satisfied the M...

Страница 33: ...e orange button Tst Pw switches between the standard display FIG 12 and an alternate display in which the yellow and green button control the power supply to the encoder and vibrator of the connected altimeter FIG 13 THE ENCODING ALTIMETER RESULTS SCREEN The Encoding Altimeter Test records the following kinds of errors Invalid Gray code when the Gray code does not correspond to any altitude value ...

Страница 34: ...and Adjustment manual for more information 7 6 2 DISPLAYING DATA COMING FROM THE ARINC 429 BUS The function can be enabled by entering the Main Menu SHIFT 3 and selecting Functions and then ARINC 429 The display will show the ARINC Screen FIG 14 FIG 14 THE ARINC SCREEN Use the and keys to browse the list Touch the orange button Back to return to the Status Screen D Marchiori Copyright 34 ...

Страница 35: ... next chapter for more information Changes to the values inside the Limits Menu are immediately active All future operations will automatically utilize the new limits until power is turned off or the limits are changed again 8 2 LOADING AND SAVING LIMITING VALUES The MPS49 stores the limiting values and the choice of measure units inside test profiles When the equipment is powered up it loads the ...

Страница 36: ...tion of Cross Bleed Equalize needle valves can increase the Altitude Rate to excessive values The suggested procedure is the following 1 Slowly open the Ps Pt and Ps Ps2 cross bleed valves simultaneously If the altitude tends to go outside the safe working limits then slightly open the Pt vent valve 2 When both cross bleed valves are open slowly open the Pt vent valve until all lines return to amb...

Страница 37: ...tatus Screen always displays the battery level NOTE while the MPS49 is connected to the AC power the battery level will always be shown as 100 To obtain an accurate reading keep the power cable disconnected for one minute with the ADTS in MEASURE mode The current battery level may also change while the pumps are running 10 4 CENTER LINE CORRECTION If there is an altitude difference between the ADT...

Страница 38: ...anual 10 6 1 SAVING VARIABLE PARAMETERS The fine tuning parameters can be saved in the MPS49 non volatile memory The procedure is described in the MPS49 Calibration and Adjustment Manual 10 7 TRUE AIRSPEED The MPS49 can show both the default I A S Indicated Air Speed and T A S True Air Speed The Operator can input the temperature for the true airspeed calculation by either pressing SHIFT 5 or ente...

Страница 39: ...CKING ON INDIVIDUAL PORTS The basic use case of the multiple isolator consists of isolating single ports to identify the source of a leak when more than one pneumatic output is connected In fact the standard leak test function chapter 7 2 permits to detect the presence of a leak but does not enable to detect which part of the whole pneumatic circuit is leaking By closing each individual port the O...

Страница 40: ...in the upper part of the screen disappear Enter the new commanded values and press CNTR to enter CONTROL mode To close or open a pneumatic port press SHIFT 000 FIG 20 THE SPECIAL MULTIPLE ISOLATOR SCREEN At any time touch the orange button Vent or press the SHIFT LEAK keys to safely open all closed ports and return to ambient pressure NOTE when opening a port the MPS49 checks the difference betwee...

Страница 41: ...essure 10 10 ALTITUDE AND AIRSPEED OSCILLATION OPTION The MPS49 ADTS can be configured to generate oscillations on the Static and Pitot channels The function can be enabled by entering the Main Menu SHIFT 3 and selecting Functions Oscillation and the desired channel The Operator must enter the following parameters Offset the average altitude value Amplitude the amplitude of the oscillation Period ...

Страница 42: ... a set of limiting values and the selection of measure units For this reason test profiles can also be used to save and organize different sets of limiting values 11 1 1 PROFILES AND PROFILE RESULTS A test profile contains a sequence of test points that the MPS49 follows when the profile is run Each test point contains the following data altitude Ps altitude Ps rate upper and lower tolerance for t...

Страница 43: ...ching the Edit button on the Profiles Menu The MPS49 will show the Profile Selection Menu for selecting the memory location If the Operator selects an empty memory location a new profile will be created After pressing the Select button the display will show the Profile Editing Menu FIG 22 This menu allows the Operator to set name of the profile controlled units aeronautical or pressures AoA contro...

Страница 44: ... on the Profile Editing Menu FIG 22 and the MPS49 will ask whether to save the profile or not NOTE unsaved changes are immediately lost 11 3 RUNNING TEST PROFILES A test profile can be started by touching the Run button on the Profiles Menu The display will show the Profile Selection Menu for selecting the profile to run NOTE If the profile requires an altitude offset the Operator will be asked to...

Страница 45: ...e show intermediate results 11 4 PROFILE RESULTS As explained in chapter 11 1 1 the MPS49 can record the results of test profiles When a profile is completed the results can be saved into the non volatile memory of the ADTS Saved results can be reviewed on the MPS49 display copied into a USB pen drive or downloaded to a PC The MPS49 prompts the Operator to save the results as soon as the test prof...

Страница 46: ...1 From the Status Screen check that the measure units are feet and knots 2 Enter the Main Menu SHIFT 3 and select Functions Profiles Edit 3 Select an empty slot and touch the yellow button Select 4 Enter the following values remember to press ENTER after each entry a profile name for example test b units aeronautical c AoA control None d steps 5 5 Touch the yellow button Steps 6 Select step 1 and ...

Страница 47: ... step 1 will be copied into step 2 11 Change the only value that differ between the two steps a Altitude 0 12 Press the orange button Back 13 Select step 3 and touch the yellow button Edit 14 Copy the values from the previous step and edit them Repeat for steps 4 and 5 15 After entering all the data press the orange button Back to leave the profile editing menus 16 Confirm saving the profile D Mar...

Страница 48: ...232 port A USB port is available as option DMA provide a RS232 cable and also a USB RS232 cable for systems that do not feature a RS232 port The USB connection and the DMA USB RS232 cables are identified by the operating system as a USB RS232 converters 12 1 1 ETHERNET The MPS49 front panel can be fitted with an Ethernet port Communication to the ADTS is by means of a TCP IP connection IP address ...

Страница 49: ... over a TCP IP connection on a Wireless LAN 1 Connect the Wi Fi adapter wait for 5 seconds and select Wi Fi REMOTE mode 2 On the PC search for wireless networks The MPS49 will be detected as MPS49 S N xxxx where xxxx is the serial number of the unit 3 Use the password xxxx0 to connect to the Wi Fi network The password is the serial number of the unit followed by one zero The IP address of the PC w...

Страница 50: ...IFT 4 Enter the Remote Mode SHIFT 5 Shorthand for the Tas Ias menu SHIFT 7 Same as touching the orange square button if displayed SHIFT 8 Same as touching the yellow square button if displayed SHIFT 9 Same as touching the green square button if displayed SHIFT 0 Shorthand for the Settings Menu SHIFT 000 Activate the Multiple Isolator function SHIFT Select AoA display SHIFT DOT Only for Company Ser...

Страница 51: ...ration of the MPS49 are to be found in the MPS49 Calibration and Adjustments Manual 14 2 CALIBRATION SERVICE In Italy D Marchiori s r l maintain Accredia accredited calibration laboratory LAT No 106 guaranteeing low Uncertainties from the National Physical Laboratory for the Air Data pressure range D Marchiori s r l specialise in the service and calibration of Air Data Test Sets and other aerospac...

Страница 52: ...NECTOR DETAIL The following diagram enumerates the pin connections for the Encoding Altimeter interface plug socket located on the front panel of the MPS49 option H0 FIG 27 WIRE DIAGRAM OF THE ENCODING ALTIMETER CONNECTOR D Marchiori Copyright 52 ...

Страница 53: ...hey believe that any of such conditions applies and arrange the shipment of the equipment to Italy D Marchiori s r l will inspect and verify the equipment and then will contact the customer in order to arrange repair substitution or purchase as used product Only if the equipment cannot be repaired D Marchiori s r l will inform the customer and then dispose of the product according to current regul...

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