OPERATING INSTRUCTIONS - TetraTec Instruments GmbH
Contents
1. 12 Program Re zero Lockout 13 Specifications 14 F N 353 440 3 Apr 24 2000 KEYPAD FUNCTIONS ON OFF amp BACKSPACE KEY Turns the tester on and then turns it off from the Measure D ae Mode Also serves as a backspace key when editing in the Program Mode The backspace function takes the user out of a programmable register without changing the previous setting Pressing this key repeatedly will return the user to the Measure Mode and then shut off the tester LEAK amp UP ARROW KEY In the Measure Mode activates and deactivates the LEAK z function per FAR 91 411 guidelines After an aircraft s iJ static system is evacuated to desired level LEAK starts a 120 second settling time countdown reduce settling time in 30 sec increments by pressing LEAK again A 60 second leak test follows displaying starting altitude in upper right and current altitude in upper left Leak in FPM or MPM is displayed after test period Up arrow key is used to scroll through the programmable registers when the unit is in the Program Mode Once a programmable register is selected the up arrow can be used to edit that register R of C amp DOWN ARROW KEY In the Measure Mode activates and deactivates the Rate of Climb function R of C is displayed on top line with instantaneous altitude remaining on bottom The time period over which the R of C is calculated can be adju2. arrow key Top line reads HEADER NAME bottom line reads MERIAM INSTR cursor flashes at bottom left Displays a number between 0 and 9 a letter from A to Z ora blank space Cursor advances one space to right Corrected value is displayed Cursor flashes at bottom right Top line reads PROGRAM MODE bottom reads UNITS SELECT Returns to Measure Mode CONTRAST SELECT The Contrast Select register allows the user to adjust the character contrast of the LCD display to provide the best visibility for the ambient conditions If during the contrast adjustment an error is made pressing the backspace key returns the display to the previous contrast setting To adjust the contrast follow the keystrokes below Keystroke Display 1 From the Measure Mode Top line reads PROGRAM press the PRGM key MODE bottom reads UNITS SELECT 2 Press the up arrow key Bottom line reads CONTRAST three times SELECT 3 Press ENTER key right gt Top line reads CONTRAST arrow ADJUST bottom line shows a numeric value 4 Press up arrow to decrease LCD lightens or darkens contrast or down arrow to depending on value set increase the contrast 5 Press the PRGM key Accepts selected setting top line reads PROGRAM MODE bottom reads UNITS SELECT 6 Press backspace arrow key Returns to Measure Mode R oF C Rate SELECT T
3. ELEVATION VALUE bottom line shows old value Cursor flashes at first position while value is corrected then moves to right once right gt arrow key is pressed CHANGE YES changes to CHANGE NO and previously stored ELEV is accepted Top line reads previously stored TEMP bottom line reads CHANGE YES Top and bottom lines read similar to 4 a and 4 b above Top line reads SEA LEVEL VALUE bottom line reads previously stored value Re zero procedure is completed and display returns to Measure Mode FACTORY ZERO is displayed Upon use of right gt arrow key the factory zero is restored Display returns to Measure Mode REF TO ABS ZERO is displayed Upon use of right gt arrow key after complete vacuum is applied a new zero is taken 11 Accuracy RECERTIFICATION RECALIBRATION The Precision Altimeter Tester s accuracy can be recertified using a 0 0035 of reading absolute deadweight tester The tester should be checked at a minimum of four test points 25 50 75 and 100 of the units range 900 mm Hg Abs Before performing the evalua tion perform the re zeroing procedure see Page 10 using the most accurate corrected to sea level barometric pressure possible and consider the following information 1 Use the User Unit Select option in Program Mode to match the Precision Altimeter Tester units to the deadweight tester units Be sure t
4. key 2 Press up arrow key twice 3 Press ENTER key right gt arrow then up arrow key three times 4 Press ENTER key right gt arrow then the up or down Warrow keys until desired shut off time is shown 5 Press ENTER key right gt arrow 6 Press the backspace arrow key twice Display Top line reads PROGRAM MODE bottom line reads UNITS SELECT Top line reads PROGRAM MODE bottom line reads USER INFO SELECT Top line reads AUTO SHUT OFF bottom reads ENTER TO SELECT Top line reads AUTO SHUT OFF bottom line toggles to DISABLED 10 MINUTES 20 MINUTES 30 MINUTES 45 MINUTES and 60 MINUTES Desired Auto Shut Off time is selected top line reads AUTO SHUT OFF bottom reads ENTER TO SELECT Returns to Measure Mode UsER INFo SELECT The User Info Select register is designed to provide the user with information on the hardware and software in the tester This register stores information on the sensor s serial number software version date of last calibration Auto Shut Off status and the instrument Start Up Header This Header appears on the top display line when the tester is turned on The second line displays the Full Scale of the tester in the last engineering units selected The factory setting of the Header is MERIAM INSTR but can be edited to show a custom alpha nu
5. 0 seconds An incorrect code or timeout will return the unit to Measure Mode Any two digit numeric code can be programmed The factory Lockout Code of 00 disables the Lockout To set the Lockout Code follow the keystrokes listed below Keystroke From the Measure Mode press the PRGM key Ifthe Lockout is set enter the correct password when prompted 2 Press the up arrow key twice 3 Press ENTER key right gt arrow then the up arrow key four times 4 Press ENTER key right gt arrow then press the up or down arrow keys to change to the first digit Press the right gt arrow key to proceed 5 Press ENTER key right gt arrow when desired code is set Lockout is activated 6 Press the backspace arrow key twice Display Top line reads PROGRAM MODE bottom line reads UNITS SELECT Bottom line reads USER INFO SELECT Top line reads LOCKOUT CODE bottom line reads ENTER TO SELECT Bottom line shows old Lockout code Cursor flashes at first position while value is changed then moves to right position once right gt arrow key is pressed Top line reads LOCKOUT CODE bottom line reads ENTER TO SELECT Returns to Measure Mode 13 PRropbuct SPECIFICATIONS MODEL NUMBER AND RANGE 353 A10900 0 900 mm Hg Abs 2000 to 60000 feet ALTITUDE Exceeds FAR 43 Appendix E LEAK Test funct
6. 353 PRECISION ALTIMETER TESTER OPERATING INSTRUCTIONS The Model 353 provides Altitude Rate of Climb R of C and Leak testing at the stroke of a key It is microprocessor based and its accu racy is 0 02 of full scale includ ing all effects of linearity repeat ability hysteresis and tempera ture over the range of 23 F to 122 F Altitude can be displayed in feet or meters and R of C in fpm or mpm Resolution is to the nearest foot or meter Other display options include user selectable pressure A units of inches of Mercury mm of Mercury or millibars Included is a feature for leak testing of aircraft altimeter systems PRECISION ALTIMETER TESTER TABLE OF CONTENTS Subject Keypad functions Measure Mode Program Mode Units Select Damp Rate Select 4 Auto Shut Off 5 User Info Select Start up Header information Contrast Select R of C Rate Select Changing the battery Re zeroing Procedures Maintenance Recommendation 10 11 Accuracy Recertification Re calibration
7. e page 13 for details Keystroke 1 Turn unit on and allow 15 min warm up Vent pressure conn ection to atmosphere 2 Press up and down arrow keys simultaneously 3 Press right gt arrow key to select this ZERO SOURCE For other zeroing options see OPTIONS after Step 8 below Display Measure Mode activated Previously selected units and current value shown Top line reads ZEROING SOURCE bottom line reads SEA LEVEL PRESS Top line reads previously stored ELEV bottom line reads CHANGE YES 10 4 a To enter new ELEV press right gt arrow key Use up or down arrow keys to change the first position Use right gt arrow key Continue procedure until correct ELEV is shown 4 b To accept stored ELEV use up or down arrow key to toggle to NO and press right gt arrow key 5 Right gt arrow key completes ELEV screen 6 To enter new TEMP follow Step 4 a To accept the TEMP displayed follow Step 4 b 7 Right gt arrow key completes TEMP screen 8 To enter a new SEA LEVEL VALUE follow Step 4 a To accept displayed value use right gt arrow key to finish OPTIONS A At ZEROING SOURCE menu see Step 3 use up arrow key to move to FACTORY ZERO source B Use up arrow key to move to REF TO ABS ZERO Apply complete vacuum lt 10 microns Use right gt arrow key to finish Top line reads
8. he R of C Rate Select feature allows the user to customize the time period over which the Rate of Climb is calculated When testing for rapidly changing climb short time periods are desirable Longer periods yield the most stable display for calibrating climb indicators To change the R of C Rate follow the keystrokes listed below Keystroke Display 1 From the Measure Mode press the PRGM key 2 Press the up arrow key four times 3 Press ENTER key right gt arrow 4 Press up or down barrow 5 Press ENTER key right gt arrow key to select the desired Rate 6 Press backspace arrow key Top line reads PROGRAM MODE bottom reads UNITS SELECT Bottom line reads R of C RATE SELECT Top line reads R of C RATE SELECT bottom line reads value Bottom line shows R of C Rate in seconds Accepts new R of C Rate top line reads PROGRAM MODE bottom reads UNITS SELECT Returns to Measure Mode CHANGING THE BATTERY The tester is powered by a 9 volt alkaline or lithium battery When the output of the battery under load drops below 6 5 volts the display flashes LOW POWER DETECT and REPLACE BATTERY To replace the battery locate the battery compartment in the bottom rear of the tester Push down on the small rectangular area on the battery cover and slide the cover out the bottom of the unit Pull the battery connector off the battery term
9. inals Plug the new battery into the connector and install in the compartment Slide the battery cover on until the locking clip locks into the tester housing 9 RE ZEROING Procepure MAINTENANCE RECOMMENDATIONS To maintain the accuracy of the 353 Precision Altimeter Tester periodic re zeroing is recommended Zero shift can occur in the absolute pressure sensor While zero shift will not alter the calibration curve in any way shift of sufficient magnitude can cause the indicated accuracy to fall outside of factory specification Meriam recommends re zeroing the 353 every sixty 60 days during seasonal use or after twenty five 25 exposures to extreme temperature conditions below 23 F or above 104 F The maintenance procedure is given below Accurate values for elevation above sea level outside air temperature and corrected to sea level barometric pressure will be needed to complete the re zero procedure Most certified repair stations will know their elevation above sea level Temperature to 3 F is adequate The corrected to sea level barometric pressure should be obtained from the user s standard or from another reliable and accurate source Never use station uncorrected barometer in the re zero procedure To Re zero follow the procedure below If a Lockout is set perform ing step 2 below will result in a Lockout prompt The Lockout code will need to be input before access to the Re zero is permitted Se
10. ion per FAR 91 411 guidelines 1 a 120 second settling time display 2 for the next 60 seconds the display holds the initial altitude and displays the current altitude 3 the final display shows the 60 second leak rate in feet or meters per minute RATE OF CLIMB Display exceeds 6000 feet per minute NIST TRACEABLE ACCURACY 0 02 of FS FS 900 mm Hg Abs Equivalents 7 feet at sea level 24 feet at 35 000 feet 10 feet at 10 000 feet 77 feet at 60 000 feet Zero Stability twelve months 0 05 of FS TEMPERATURE Storage 40 to 140 F 40 to 60 C Operating 23 to 122 F 5 to 50 C PRESSURE LIMIT 4000 mm Hg Abs 5 atm POWER 9 volt Alkaline battery 9 volt Lithium batteries can also be used and are recommended below 32 F 0 C MEDIA COMPATIBILITY Fluids compatible with 3 16ss DISPLAY 5 significant digit LCD 0 25 high 2 line x 16 alphanumeric characters CONNECTIONS 1 8 female NPT 316ss ENCLOSURE 6 5 x 3 6 x 2 25 ABS plastic case WT 14 ozs 14
11. meric string as desired by the user To view or configure any Unit Info Select register follow the keystrokes listed below Keystroke 1 From the Measure Mode press the PRGM key 2 Press the up arrow key two times 3 Press the ENTER key gt 4 Press the up arrow key 5 Press the up arrow key 6 Press the up arrow key 7 Press the up arrow key Continued on next page Display Top line reads PROGRAM MODE Bottom line reads UNITS SELECT Bottom line changes to USER INFO SELECT Bottom line shows S N Software version number shown Manufacture date shown Top line reads AUTO SHUT OFF bottom reads ENTER TO SELECT See steps on page 5 Top line reads LOCKOUT CODE bottom reads ENTER TO SELECT See steps on page 13 8 To edit the Header press the up arrow key 9 Press the up or down arrow keys to set the alpha numeric value 10 Press ENTER key right gt arrow to accept the selected value 11 Repeat steps 11 and 12 until the desired Header is shown 12 If an error is made press the back arrow key until cursor is over the incorrect value Follow step 9 11 to correct Press the right gt arrow to advance the cursor without changing values 13 When Header is complete press the PRGM key to advance cursor to line end 14 Press ENTER key right gt arrow 15 Press the backspace
12. o match the temperature reference of the deadweight tester to the Precision Altimeter Tester temperature reference 0 C for inches Hg and mm Hg units Millibars has no temperature reference 2 Correct the deadweight tester readings for ambient temperature when it is different from the reference temperature The Precision Altimeter Tester does this automatically 3 The local gravity where the evaluation is being performed must be corrected for on the deadweight tester Standard gravity reference is 980 665 cm sec sec 45 north latitude at sea level 4 Make sure there are no leaks in the system The evaluation described will confirm if the 353 is operating within its accuracy specification over the operating temperature range An out of spec 353 should be returned to the factory for recalibration No field recalibration is possible Call your Meriam Instrument distributor or the factory for a Return Material Authorization RMA number Meriam Instrument Ph 216 281 1100 10920 Madison Ave Fax 216 281 0228 Cleveland OH 44102 All 353 Precision Altimeter Testers recalibrated at the factory are returned with certificates of NIST traceability 12 Lockout SELECT Enabling the Lockout feature prevents unauthorized users from mak ing changes to the configuration of the tester To enter Program Mode or to Re Zero the tester the user must first enter the password two digit Lockout Code when prompted within about 4
13. o the desired register Units SELECT The standard engineering units available on the Precision Altimeter Tester are the following 1 FEET 4 METERS 2 INCHES OF Hg 5 MILLIBARS 3 MM OF Hg To change engineering unit of measure the tester should be ON and in the Measure Mode Then use the following steps Keystroke Display 1 Press PRGM key Top line reads PROGRAM MODE and bottom line reads UNITS SELECT 2 Press ENTER key right gt Top line reads UNITS SELECT arrow and bottom shows current engineering unit 3 Press up or down Engineering units on bottom line arrow key until desired of display change engineering unit is displayed 4 Press ENTER key right gt Top line reads PROGRAM arrow to select engineering MODE and bottom line reads unit UNITS SELECT 5 Press the backspace arrow Display returns to Measure Mode key in new engineering unit Damp Rate SELECT Adjustable damping is available to steady the display when measuring pulsating altitude or pressure The Precision Altimeter Tester has damping rates of 0 1 0 2 0 5 1 2 and 5 seconds Damping is done by averaging new data from the pressure sensor against previously collected data The microprocessor collects data from the sensor every 0 1 seconds When set at 0 1 seconds the display updates every 0 5 seconds showing the current 0 1 second pressure reading When set at 5 sec
14. onds the display updates every 0 5 seconds showing the average of the previous 5 seconds readings Therefore at this setting it takes 5 seconds from the time pressure is changed until the tester displays the actual applied pressure To set the damp rate Keystroke Display 1 From the Measure Mode press the PRGM key Top line reads PROGRAM MODE bottom line reads UNITS SELECT 2 Press the up arrow Bottom line reads DAMP RATE key SELECT 3 Press ENTER key right gt arrow Top line reads DAMP RATE SELECT bottom line reads current damp rate 4 Press the up or down arrow keys to change to desired rate Bottom line shows new damp rate in seconds 5 Press ENTER key right gt arrow 6 Press the backspace arrow key Selects damp rate top line reads PROGRAM MODE bottom line reads UNITS SELECT Returns to Measure Mode Auto SHUT OFF Enabling the Auto Shut Off feature allows the tester to turn itself off after a user selected period of keypad inactivity Selectable options include DISABLED 10 Minutes 20 Minutes 30 Minutes 45 Minutes and 60 Minutes Disabling this feature limits the tester to being turned off by using the ON OFF key only Units are shipped from the factory with the Auto Shut Off set for 10 Minutes To change the auto shut off setting follow the steps below Keystroke 1 From the Measure Mode press the PRGM
15. sted to user preference through the Program Mode Down arrow key is used to scroll through programmable registers with the unit in the Program Mode Once a programmable register is selected the down arrow can be used to edit that register PRGM amp ENTER KEY Puts the tester into Program Mode with prompt for password if Lockout is set from Measure Mode When in the Program Mode pressing this key selects the programmable register to be edited After the register has been edited pressing the PRGM key enters the new setting into the tester s non volatile memory This key also acts as a forward space gt key when editing user input such as the header name Measure Mope The Measure Mode is the tester s start up mode Measured altitude or absolute pressure is displayed in user selected units PRoGRAM Mope The Program Mode is used to configure the tester for Measure Mode operation The configurable registers that are found in the Program Mode are Units Select Damp Rate Select User Info Select Contrast Select R of C Rate Select and Exit The tester can be put into the Program Mode at any time during Measure Mode operation by pressing the PRGM key if Lockout is set the correct code must be entered when prompted see page 13 for Lockout instructions The top line of the display will read PROGRAM MODE The bottom line will read UNITS SELECT Press the up or down arrow keys to scroll through the Program Mode t
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