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RUSKA 7750i

1. A 1 RUSKA 7750i Users Manual Long Term Stability Long Term Stability defines how the instrument drifts with time This specification can be utilized to define the calibration interval for the standard Some manufacturers will provide more than one stability specification for their instrument based on different calibration time intervals It is important to understand that you should not arbitrarily vary the manufacturer s stability specification based on time without knowing the characteristics of their device Some manufacturers identify that their stability specification 1s proportional with time Therefore if the calibration interval were reduced in half the magnitude of the stability specification would also be halved This can be a powerful tool when you are trying to improve the measurement performance of a standard By reducing the calibration interval the expanded uncertainty would also reduce On the other hand some manufacturers do not claim that their stability specification is proportional with time This would be the case for instance if the instrument naturally drifted in a sinusoidal fashion This would suggest that the sensor could drift to its maximum stability limit at any time and therefore reducing the calibration interval would not improve the expanded uncertainty of the device Short Term Stability Short Term Stability relates to the zero drift characteristics of the instrument This generally is classified as
2. v id serial close J unsigned v o outportb portbase 1 outportb portbase 4 v inportb 0x21 els Tes Intro outportb 0x21 v setvect intnum 8 old vector CH EEN serial write write a single character to serial port EE EE EE EE EE void serial write char ch while transmit enabled while inportb portbase 5 Ox20 0 outportb portbase ch 5 16 Remote Operation 5 Sample Programs write 7000 serial write a string to the correct 7750 a a eae Ea A A HH void write 7000 serial char s if address 1 serial write CLEAR Disable Addressing else serial write DLE Enable Addressing serial write address 0x20 Address while s Write string serial write s EE request 7000 serial write a commmand and read the response En cue cu cm M LA Mm int request 7000 serial cbar s int 1i char ch clock_t start current write_7000_serial s Write Command i 0 while i lt QUEUE SIZE 1 start clock while inq in inq out Wait for a characte current clock if current lt start current CLK TCK 86400 if current start gt TIMEOUT Check for timeout buffer i 0 return FALSE ch inqueue ing out Put character in buffer if inq out QUEUE SIZE ing out 05 if ch 0x0A Line Feed End of respons buffer i 0 ret
3. iaa E eil Pn IA ibonl device 0 wii os a o ee M en PES LP IS LO Ee e Ac IP i Ip a e ois E ides Lp o PO Ip eden adis odes ees e check errors display all GPIB and 7750 error messages return TRUE if any errors were found EE int check errors void unsigned char status7 int retval A E NR E E E NN EEE Check for GPIB Interface Errors M es Be See ey ee eyes ea if ibsta amp ERR printf GPIB Status 4X Error d n return 1 EE EECH Check for 7750 Errors CN MEME ME MES CES EN EES retval 0 while kbhit ibrsp device amp status7 Serial poll if status7 amp 4 0 Check error bit break retval 1 request_7000 SYST ERR n Get error message printf buffer j return retval write 7000 write a command to the 7250 St void write 7000 char s j ibwrt device s strlen s 9 5 11 RUSKA 7750i Users Manual muc ettet LL SELLE o o eee request 7000 write a query command and read the response A E void request 7000 char s ibwrt device s strlen s ibrd device buffe
4. Es Za Ee a ra En Sn Ses Sr en E d Ze nn Ge oe an o Zeng Ge a a Dn e ri Zen At d Za e d Za 5 15 RUSKA 7750i Users Manual vold interrupt serial inte f char ch if inportb portbase 2 amp 0x07 0x04 ch inportb portbase if ch XON transmit_enabled TRUE else if ch XOFF transmit_enabled FALSE else inqueue ing in ch if inq in QUEUE SIZE ing in E j outportb 0x20 0x20 DA Sk hs his Sh ty SS Sy eS hr Sr Sra Sra Sra ora Sta ors St or Stare a serial initialize initialize serial port Si A Se Ss oe oe ewe cE Se ee es Se AN eee Be ee AAA void serial initialize char msg 10 Int divisor unsigned v portbase Ox3F8 COMI Ox3F8 COM2 Ox2F8 intnum 4 COM1 4 COM2 3 outportb portbase 3 0x80 outportb portbase 1 0 outportb portbase Ox0C 9600 Baud outportb portbase 3 3 8 Databits No Parity 1 Stopbit d old vector getvect intnum 8 Save old interrupt vector setvect intnum 8 serial int Set new interrupt vector v inportb 0x21 Enable interrupt V amp 1 lt lt intnum oubportb 0x21 v outportb portbase 1 0x01 Enable receive interrupt outportb portbase 4 0x0B Enable Interrupt DTR RTS serial write CLEAR EE A COS FORCES OA E ye FS serial close turn off serial receive interrupt Fe EE A A EE EE EE
5. 240 VAC 50 50 Hz 150 W max 18 C to 36 C 20 C to 70 C 5 to 95 relative humidity non condensing Nominal Control Volume 5 to 60 in 80 to 1000 cm 7inHx 16 5 in W x 19 in D 17 8 cm x 41 9 cm x 48 3 cm 45 lb 20 kg Engineering Units inHg at 0 C and 60 F kPa bar psi inH5O at 4 C and 25 C kg cm2 mmHg at 0 C cmHg at 0 C and cmH5O at 4 C amp two user defined linear units of measure Aeronautical Units feet meters knots km h Mach 1 4 inch NPT female with AN4 amp ANO adapters supplied Test Port 120 of Maximum Scaled Quartz Sensor Range 60 psi 5 psi 4 bar 0 5 bar Minimum 50 liters per minute with auto vent feature Ultimate vacuum less than 1 mtorr IP 20 Indoor use Altitude 2000 in EN 61326 EN 61010 Pressure Equipment Directive 97 23 EC class Sound Engineering Practice SEP IEEE 488 and RS232 Summary of Specifications A Specifications Gas Specifications Pressure Source Medium Clean Dry Air or Industrial Grade Nitrogen 99 5 pure lt 50 microns 50 C dew point Pressure Source Particle Size Contamination Pressure Source Max Moisture Content Pressure Source Max Hydrocarbon Content 30 ppm Table A 5 Specifications RUSKA 77501 From 25 to 100 of FS 0 00596 of Reading Below 25 FS 0 005 of 25 FS Stability Over 3 Months Over 1 Year 10 mtorr at 100 mtorr 1096 RDG at gt 100 mtorr 5 to 60 in 80 1000 cm 0 001995
6. VALue lt n gt lt number gt DATA POINts VALue n VALue lt n gt lt number gt CALibration VALue lt n gt POINtS DATE TIME ZERO DATE TIME VALue number VACuum number INITiate INITLSUE RUN STOP WAIT lt minutes gt lt seconds gt PRESSure11 VALue n number DATA POINts VALue n VALue n number CAbibration VALue lt n gt POINtS DATE Remote Operation 5 Device Messages Maximum Altitude limit Maximum Airspeed limit Maximum Mach limit Maximum Ps pressure limit Maximum Qc pressure limit Maximum Pt pressure limit Maximum Altitude rate limit Maximum Airspeed rate limit Maximum Mach rate limit Maximum Ps Pressure rate limit Maximum Qc Pressure rate limit Maximum Pt Pressure rate limit Minimum Altitude limit Minimum Airspeed limit Minimum Mach limit Minimum Ps pressure limit Minimum Qc pressure limit Minimum Pt pressure limit Calibration enabled Request calibration mode access code Ps Abort dry mode Ps Initiate dry mode Set maximum vacuum UNIT VAC Start Ps and Qc zero abort zero calibration Set minimum zero wait time perform Ps calibration point number of Ps calibration constants label value C0 0 123 Set calibration constant Ps nominal calibration point Ps number of calibration points Ps last calibration date Ps last calibration time Ps last zero date Ps last zero time Ps sets vacuum
7. AvionT Eq SR ei eh eh ef We Test with full trust WwwyLavionteq com Calibration RUSKA 77501 Air Data Test Set Users Manual PN 3963351 November 2010 O 2010 Fluke Corporation All rights reserved Printed in USA Specifications are subject to change without notice All product names are trademarks of their respective companies LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service The warranty period is one year and begins on the date of shipment Parts product repairs and services are warranted for 90 days This warranty extends only to the original buyer or end user customer of a Fluke authorized reseller and does not apply to fuses disposable batteries or to any product which in Fluke s opinion has been misused altered neglected contaminated or damaged by accident or abnormal conditions of operation or handling Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Fluke does not warrant that software will be error free or operate without interruption Fluke authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Fluke Warranty support is available only if pr
8. IIIS cuina 4 14 4 13 Menu Menu Setup Units Edit Name 4 15 4 14 Menu Menu Setup Remote rrr nen nena edo Fara 4 15 Menu Menu Setup SYSt loma UU T UU T 4 16 4 16 BEIDE TC nica 4 18 4 17 Menu Menu Test Remote GPIB ccc ccccccccccccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeees 4 19 4 18 Menu Menu Test SBODl eiie sette tte etn et Ehe ete RENS etn ett pred ea 4 19 4 19 Menu Menu Test Controller cuina eei medir ini ees 4 20 4 20 Meno Menu Display eg geb ite bee daa 4 20 Deck Menu Menu Test Self aiii 6 1 6 2 Menu Menu Calibration Calibration essen 6 4 D Menu Menu EENEG ai 6 8 D OCROHIS EE 6 8 O29 LOS CE E o ta tadeanseestedeasteaetnises 6 10 6 6 Mechanical Zeroing SCLGell eee eee gege sette dad 6 10 64 Adjusting the Elterendeel 6 11 6 5 Photocell Localo EE 6 11 6 0 Menu Kiem Test Controls iia 6 12 RUSKA 7750i Users Manual O I0 JAuto Iufe A ER Pole Packing the AD RK vili Chapter 1 General Information Introduction This manual contains operation routine and preventive maintenance instructions for the RUSKA 77501 Air Data Test Set ADTS manufactured by Fluke This section of the manual provides general information about the ADTS and presents its features and options How to Contact Fluke To order accessories receive operating assistance or get the location of the nearest Fluke distributor or Service Ce
9. Status register from unit int address int portbase int intnum volatile int transmit enabled TRUE char inqueue QUEUE SIZE iDt ng I8 int ang out void interrupt old vector J int check errors void void serial initialize void void write 7000 serial char s void serial_close void int request 7000 serial char s void serial write char ch void main void char p Initialize Serial Interface 2 oe eS HM S address 4 serial initialize Jg Q T S Initialize 7750 Interface pe E UNIT FS Set units to percent of full scale PRES 20 0 Set control setpoint to 20 FS PRES TOL 0 001 Set control tolerance to 0 001 FS OUTP MODE CONTROL Enter control mode A a T write 7000 serial UNIT FS PRES 20 0 TOL 0 001 0UTP MODE CONTROL n 5 14 Remote Operation 5 Sample Programs Lf check errors serial close return LllLlmlalcnclclollllllll2laLllllilnal2l2l22222222225 Read pressure status until setpoint is reached d d MEAS Read pressure STAT OPER COND Read status setpoint Ge Sen a a da e ave a ja las SE E
10. The RS 232 connection is a DB 9P connector found on the back panel of the ADTS It is located on the processor board The following pins are used all other pins are reserved Pin Direction signal 2 In RXDReceive Data 3 Out TXD Transmit Data 5 GNDGround 7 Out RTS Request to Send Remote Local Operation In Local mode the ADTS is operated manually through the front panel Chapter 4 covers local operation The ADTS always powers up in the Local mode In Remote mode the ADTS is operated by a computer connected to an interface Most functions that can be performed in Local mode can also be performed remotely Remote mode does not automatically disable local operation The remote interface may be active while local operations are being done In cases where full remote control is required the following methods may be used 1 Issue a Local Lockout LLO interface message via the IEEE 488 interface The ADTS will disable the local keyboard until the Go To Local GTL interface message 1s received or the REN Remote Enable line is unasserted This method cannot be used on the serial interface 2 Issue the SCPI command SYSTEM KLOCK ON to lock the local keyboard The ADTS will disable the local keyboard until the command SYSTEM KLOCK OFF is received 3 Issue the SCPI command DISPLAY ENABLE OFF or DISPLAY TEXT lt string gt These commands will disable the local display in addition to locking the keyboard The com
11. gme37 bmp Figure 6 10 Auto Tune Screen If any control valves or the high speed inner loop pressure sensor has been replaced the Auto Tune should be run to characterize the new hardware Fan Operation When operating the system within the ambient conditions listed in the specification the fan defaults to the on condition when the instrument is powered up It has a direct impact on the chassis temperature and an indirect effect on the sensor oven temperature System Software Update Procedure Note Calibration and other stored constants are not affected by program updates The update procedure requires a PC connected to the RS 232 port on the RUSKA 77501 6 13 RUSKA 7750i Users Manual 9 pin to 9 pin null modem cable minimum pinout 2 3 3 2 5 5 l St de d Zi When appropriate the latest version of the software for upgrading instruments can be e mailed from the factory or downloaded from the website www gesensing com The e mail will have a zip file attached contains two files UPDATE7 EXE and version IMG Unzip these files into a directory on the PC Set the RUSKA 77501 to 9600 baud 8 databits no parity 1 stopbit Run the program Update7 Follow the prompts to select the communications port and the image file When the upgrade is finished Update7 running on the PC and the RUSKA 77501 should both display Complete RUSKA 7750i Controller Software Upgrade In addition to the main code the RUSKA 77501 i
12. when Case Effect Coefficient or Oven Temperature Coefficient are non zero s 0 for high range sensor s 1 for low range sensor Range Coefficients KnF 0 Range Unused 4 Valid High FSR Range 5 Valid Low FSR Range Kn0 Knl Kn2 Calibration constants for range KEE Ho A Ky Where A is the zero corrected counts 7 381 975 full scale of current range and B is the calibrated counts 7 381 975 full scale of current sensor KnH Zero corrected counts for upper limit of range When the zero corrected counts from the A D exceed this value the next higher range will be used if possible 7 381 975 full scale of current range KnL Zero corrected counts for lower limit of range When the zero corrected counts from the A D are below this value the next lower range will be used if possible 7 381 975 full scale of current range n Range number 1 4 for high range sensor 5 8 for low range sensor RUSKA 7750i Users Manual Chapter 3 Installation Introduction This section of the manual discusses initial installation for the RUSKA 77501 ADTS Installing the ADTS involves connecting the supply and test pressure tubing powering up the unit and configuring the system through the front panel Unpacking the ADTS Carefully unpack all components checking for obvious signs of damage The shipment contains the following items l 2 3 4 5 RUSKA 77501 ADTS Power cord and fittings kit Users
13. 20 000 inHg Abs The upper left corner shows the current mode of the ADTS MEASURE CONTROL or VENT The right side of the screen shows a bar graph displaying the current pressure relative to a user configurable full scale value Below the pressure is the pressure control set point below this is the difference between the set point and the actual value Below this 1s a numeric scratchpad for entering a new set point value The highlighted label on the right hand side of the screen displays the current assignments of the function keys F1 through F6 that are located beside the display Local Operation 4 Tutorial Changing Units of Measure 1 Change the pressure units The units are changed by selecting the UNITS key on the keypad US lt psi cmHg C cmH 4 inHsQ 45 C atm feet hPa gme12 bmp Figure 4 5 Units Menu 2 Use the rotary knob located to the right of the display to move the highlight bar to the desired unit Note The highlighted curser initially shows the current unit of measure When the rotary knob is moved the current unit remains highlighted in a gray color and the new unit is highlighted in a light blue color 3 When the unit desired is highlighted press the ENTER key on the far right side of the front panel under the numeric keypad The display will return to the MAIN screen with the current units Note A different Unit of Measure can be selected for each channel of the ADTS Sele
14. Integer responses are returned as one or more digits Boolean values ON and OFF values are always returned as numbers with zero for OFF and one for ON Floating point values are returned in the format d ddddddddE dd 5 9 RUSKA 7750i Users Manual ANSI IEEE 488 2 1987 Command Summary CLS ESE ESE number ESR IDN OPC OPC RST SRE SRE lt number gt STB TST WAI SCPI Command Summary Clear Status Event Status Enable Query Event Status Enable Event Status Register Identification Operation Complete Query Returns 1 Operation Complete Reset Service Request Enable Query Service Request Enable Status Byte Query Self Test Query Wait No operation The current value associated with a SCPI command may be read by appending a question mark to the command For example CALC LIM UPP will return the current upper pressure limit MEASure PRESsure PRESsure 11 PRESsure 4 PRESsure 14 Ps Qc Ps Qc Channel Channel Control Control Pressure Pressure sensor Sensor PRESsure ALT PRESsure CAS PRESsure MACH PRESsure PS PRESsure QC PRESsure PT RATE ALT RATE CAS RATE MACH RATE PS RATE QC RATE PT TEMPerature2 TEMPerature12 TRATE ALT TRATE CAS TRATE MACH TRATE PS TRATE QC TRATE PT VACuum ma FH FH FH FH FH FH FH FH r3 CALCulate PRESsure TARE VALue number ST
15. O G H D o LL o o lt 0 1000 ft Airspeed Knots gme17 eps Figure 4 10 Airspeed Knots Slew Rate User defined maximum pressure rate of change The ADTS allows the operator to set the rate for both channels of the ADTS Slew Limit The slew limit is used by the system to assure that the slew rate is not exceeded If the slew rate 1s exceeded the ADTS will change from the control mode to the measure mode and it will generate an error message to the operator Negative Qc Limit The Negative Qc limit is the maximum allowable negative differential pressure and negative airspeed allowed When in control mode and this limit is exceeded the ADTS will change from the control mode to the measure mode and it will generate an error message to the operator This limit only exists in the Qc limit screen Press MODE key to toggle between the Ps and the Qc channels RUSKA 7750i Users Manual Access The test access password allows the user to protect access to ADTS configuration and programs If the test access password is set to any number other than zero factory default it 1s required before the user is allowed to change the limits control parameters or programs The access key is only shown on the Ps channel Press MODE key to toggle between the Ps and the Qc channels Note It is recommended that the access password be recorded and filed in a secure location Menu Setup User The Menu
16. Personal Protective PBopment uk OST ASES ee Symbols Used in this Manual aaa EE e gt aiio EE Fused Quartz Bourdon Tube Technology NIST ke ERR mmm Universal Power SUpply ett Measure While C Ont EE e ET Adjustable Pressure Display aria Base OP Operation iaa Eegeregie Modular RE WEE Attractive Desktop Packaging ecc Power On sel estaran aid Pase of Cali MON Automatic Zero AQUSL asia M Automatic Head RTE e vevecwnssoscwosnsiensupsatinnseidenncetinnatintch anvoscwenntiedadeondoxsuloanes Choice E toa coa etarras Choice of Display Units cacon alados reeL e Standard Equipment amp Options cssccssinssunsssascasevevacsvacersvareserieuaiensenaevadaesencanaeenees 2 Theory of OCT AO Nara RUSKA 7750i Users Manual Dao u 0 Oia A oe I le EROTIC S LOCO EE BacksPlane DOMO E NMUCTOPrOCESSOT EE Digital Control Board HEBES EE eege Prot ere Pneumatics Module EEN Measure Mode Emtee Aessen SEENEN VAN A O OO o e A PR ay dete oe sasecnc ae eataccaui anasaresecemiecomeateos Go to Ground or Vent Procedure ooccccncccnnccnnnccnnncconocnnnccnnncconaccnnncnonicinoss Befreier Pressute Supply Pofl ep Vacuum Supply Exhaust Port Pressure e DEEN E eu E E Inner vs Outer lOODS cie AA EEN Quartz Bourdon Tube SOllSOE usiiutesmemesie ibas e diia EE EE METIS APA on Kn EE SONN EE Software safety Controls eege Preventing Operator Errors occcccccccnnnnnnnnnnnnnnnnnnnnnonnnnnnnonnnnnnnonononnnnnnnnnss as A A eist
17. SHIFTING LIGHT SPOT SHOWN AT NULL POSITIC BETWEEN PHOTOCELL PHOTOCESIGENERATE VOLTAGE ACORDING TC ILLUMINATION e e PHOTOCELLS ERROR SIGNAL TO CONTF AMPLIFIER IS ZERO WHE PHOTOCELLS ARE EQUAL ILLUMINATED POTENTIOMETER FOR ZKHBIUST CALIBRATION OF THE QBT GAU Figure 2 4 Photocell Light Spot FUSED QUARTZ BOURDON TUBE ASSEMBLY MIRROR BEAM OF LIGHT REFLECTED BY PIVOTING MIRROR LED LIGHT SOURCE gme05 eps Theory of Operation 2 Software Sensor Board The Sensor Board monitor the quartz Bourdon tube pressure sensor reference vacuum sensor Ps channel and oven temperature sensor The vacuum and temperature sensors are aligned at the factory and are utilized by the firmware The sensor board 1s also used to control and maintain the sensor housing at 50 C Linearization Term As described in the previous section the relationship between the pressure being measured and the current required to keep the quartz Bourdon tube in its zero position is the main principle behind the operation of the ADTS s sensing element Ideally this pressure current relationship would be a linear equation of the form I kP where is current k is a constant of proportionality and P is pressure However due to certain mechanical characteristics of the helical tube and its supporting structure this pressure current relationship 1s slightly nonlinear The nonlinear portion of this pressure current relationship closel
18. 2 Select MENU MENU TEST SELF 6000 pS Setpoint 0 000 Difference 110 000 Electrical gme28 bmp Figure 6 1 Menu Menu Test Self 6 1 RUSKA 7750i Users Manual 3 Press ELECTRICAL F1 The electronics self test will run and display the results The electronics test runs eight sets of tests on various parts of the electronic modules Table 6 1 describes these tests and the possible actions needed if a test fails Table 6 1 Electronics Self Test Tests the Ps amp Qc controller boards Contact factory Removing the ADTS s Cover The ADTS should be kept clean and completely assembled at all times Operating the ADTS without its cover affects the ADTS s thermal gradients and therefore may reduce precision If it becomes necessary to remove the ADTS s cover follow the instructions below A A Warning The ADTS should only be opened by qualified electrical mechanical service technicians Lethal voltages are present and exposed in the power supply and display 1 Turn off the ADTS and disconnect the power cord from the ADTS 2 Locate and unscrew the four screws that secure the cover to the back panel Place your hands near the middle of the cover and slide the cover towards the ADTS s back panel 4 Lift up on the cover With the cover removed use typical electronic cleaning tools to remove any accumulated dust from inside the instrument 5 Replace the cover before resuming operation
19. 6 Vacuum Reference A6 Vacuum Reference Zeroing Sensor Sensor RSS 0 005596 RDG amp RSS 0 009196 RDG amp A 7 Two Sigma Expanded Uncertainty 0 0009 inHg 0 0009 inHg inHg inHg Table A 3 Uncertainty Analysis for a RUSKA 7750i 3 month and Yearly Calibration 90 Day Uncertainty 1 year Uncertainty 32 inHg Qc Sensor 32 inHg Qc Sensor 2 sigma 2 sigma Uncertainty Analysis RUSKA 7750i A 1 Performance Linearity Hysteresis Greater of 0 005 of RDG Greater of 0 005 of RDG Repeatability and Temperature or 0 0004 inHg or 0 0004 inHg A 2 Span D TE 0 001996 of RDG 90 days 0 007596 of RDG year A 3 Zero A3 Zero Stability re zero at 8 hours re zero at 8 hours 0 0004 inHg 0 0004 inHg A 4 Calibration Standard Greater of 0 0010 RDG or 0 00002 Greater of 0 0010 RDG or RUSKA 2465 or 2468 DWG inHg 0 00002 inHg C RN Temperature Included in A 1 0 00096 of RDG 0 00096 of RDG A 6 Vacuum Reference A6 Vacuum Reference Zeroing Sensor Sensor A 7 Two Sigma Expanded Uncertainty RSS 0 005596 RDG amp RSS 0 009196 RDG amp 0 0007 0 0007 inHg inHg A 4 Summary of Specifications A Uncertainty Analysis Table A 4 Uncertainty Analysis for a RUSKA 7750i 3 month and Yearly Calibration 90 Day Uncertainty 1 year Uncertainty 68 inHg Qc Sensor 68 inHg Qc Sensor 2 sigma 2 sigma A 1 Performance Linearity Hysteresis Greater of 0 005 of RDG Greater of 0 00596 of RDG Repeatability and
20. Access code is common and is used for both channels gme16 bmp Figure 4 9 Menu Menu Setup Limits 4 9 RUSKA 7750i Users Manual High Limit User defined Maximum pressure limit This is often set just over the full scale pressure of the device under test DUT in order to protect the DUT The ADTS will then prevent the pressure from exceeding the high limit Limits can be set in both engineering and aeronautical units of measure If the user enters a value greater than the user defined limit the unit will not accept the value and it will generate an error code informing the user that they have entered a set point that is greater than the high pressure limit In control mode if for any reason the pressure exceeds the user defined limit it will change into the measure mode and again display an error message to the operator informing them of the error that occurred This value can be edited using the rotary knob to highlight the High Limit Then enter the new value using the keypad This will show up in the scratch pad on the lower portion of the screen Press the Enter key and the value for the high limit will be updated to the value that was typed into the scratchpad Low Limit User defined Minimum pressure limit This 1s the same as the high limit except it is to protect the DUT from low pressure limits Auto Vent User defined maximum pressure that the ADTS can reach prior to venting the test port to atmosphere The auto
21. Control Qc function key a second time and that channel will be switched back into the measure mode This will leave only one channel in the control mode A pressure set point should be entered into the ADTS prior to placing the unit into the control mode This is to assure that the operator is aware of the set point valve prior to entering into the control mode Setting the Pressure Set Point The pressure set point is the destination of the pressure control algorithm It should be set before entering Control mode The pressure set point is set to zero at power up or whenever a pressure error occurs l The pressure set point can be set from the dual display menu or the Main Menu of the single channel mode On the dual channel display mode use the rotary knob to select which channels set point is being edited Use the numeric keypad to enter the new pressure set point in the current pressure units Press ENTER to accept the entry or press CLEAR to clear the numeric scratchpad Note The set point can also be changed using either the Step or the Jog function Please see Chapter 4 Step Jog Entering Exiting Control Mode l Vent The Control mode is set from either the dual channel or the single channel display screens For the Dual channel press PREVIOUS until the Main Menu appears For the single channel press the MENU key and then press the MODE key to toggle between the two different channels In the dual display mode pressi
22. PRESSURE LEVEL IMMEDIATE AMPLITUDE 50 SOUR PRES LEV IMM AMPL 50 0 PRESSURE 50 PRES 50 To zero the unit via the remote interface use the following sequence CAL ZERO INIT Enter Zero Mode CAL ZERO INIT Read Status Mode Pressure Temperature Reference and Wait Until Stable CAL ZERO RUN Start Zero Adjust Sequence STAT OPER COND Wait Until Complete Bit O 0 SCPI Status Registers 5 8 Three type of status registers are available Condition Event and Enable Condition registers always show the current status of the instrument Bits may turn on and back off between reads The status read is the status of instrument at the moment of the read Condition registers include STB Status Byte Register ESR Standard Event Status Register STAT OPER COND Operation Status Condition Register STAT QUES COND Questionable status Condition Register Event registers do not show the current state but flag the bits in the condition registers that have changed since the last time the event register was read When an event register is read it is reset to zero STAT OPER EVENT Operation Status Event Register STAT QUES EVENT Questionable Status Event Register Enable registers are set by the user to create summary bits If the user sets a bit in the enable register when the instrument sets the corresponding bit in the event register a summary bit in the Status Byte Register is set ESE STAT OPER ENAB STAT QUES ENAB The Servic
23. RDG 3 months 0 0075 RDG year Total Uncertainty Aeronautical Units Total Uncertainty Engineering Units 32 inHg a Sea Level 2 ft 30 000 x 2 ft 60 000 7 ft 32 inHg a 5 0 0008 inHg 15 0 0013 inHg 30 0 0025 inHg 32 0 0030 inHg 40 inHg a Sea Level 2 ft 30 000 x 3 ft 60 000 8 ft 40 inHg a 5 0 0009 inHg 15 0 0014 inHg 30 0 0026 inHg 40 x 0 0037 inHg 0 to 6 000 ft min 100 inHg a Sea Level x 3 ft 30 000 4 ft 60 000 x 15 ft 100 inHg a 5 0 0016 inHg 15 0 0019 inHg 30 0 0028 inHg 50 0 0046 inHg 100 x 0 0092 inHg Rate of Cimb OA MR O Rate of Climb Tolerance 19e of commanded rate for altitudes up to 50 000 ft 5 of Commanded Rate for altitudes from 50 000 ft to 70 000 ft 1 Precision is defined as the combined effect of linearity repeatability and hysteresis throughout the operating temperature range Some manufacturers use the word Accuracy in place of Precision however the meaning is identical Requires vacuum pump to control O psig or the vent mode can be used to obtain O psig Zero drift typically improves with sensor age Total Uncertainty is defined as the two sigma combined uncertainty of linearity hysteresis repeatability thermal effects one year drift stability and the uncertainty in the Fluke primary standard which include the uncertainty from NIST The controller will control rates greater than 6000 ft min but its abil
24. Remote Operation Capabilities IEEE 488 Remote Local Operation Configuration erregt SCPI Command Format SCPI Response Format ANSI IEEE 488 2 1987 Command Summary SCPI Command Summary Example SCPI Commands SCPI Status Registers Serial Operation sample Programs sample Program 1 RUSKA 77501 GPIB IEEE 488 Controls Pressure to 20 000 FS Sample Program 2 RUSKA 77501 GPIB IEEE 488 Zero Sequence sample Program 3 RUSKA 77501 Serial RS 232 Controls Pressure to 20 000 FS sample Program 4 QBASIC Example for RUSKA 77501 Maintenance hate re een EE Observing the Software Version Number Preventive Maintenance Contents continued DS DNS DS DS DS YO HU LU KW OC NO EN DN DN DN D DN DN D O iS DS DS C IO DS DS DS DS DS DS ben K RUSKA 7750i Users Manual Initiating the ADTS S Self Test ssp Removing the ADTS s Cover Particle ELITS aaa dia esti Vacuum PUMPS AT EET o A a NE e APPO Po e o RIFAVIN Ed UDoINGEdU0ODS IGI N Callbration MS WICH ONS eege EE sime o MISI Slorine the COS LIC IC ESL rien Vacuum Sensor Calibration Ps Zeroing Vacuum Sensor Editing the Calibration Coefficient n eeae QA MENT m T T M Ps Absolute Sensor VAC Level Sensor Photocell Zeroing eebe Seeerei daras AE oo EE System Software Update Procedure esee RUSKA 77501 Controller S
25. Temperature or 0 00085 inHg or 0 00085 inHg A 2 Span Stability 0 001996 of RDG 90 days 0 007596 of RDG year A 3 Zero Stability re zero at 8 hours 0 0009 inHg 0 0009 inHg AA Calibration Standard Greater of 0 0010 RDG or 0 00002 Greater of 0 001096 RDG or RUSKA 2465 or 2468 DWG inHg 0 00002 inHg Uncertainty Analysis RUSKA 7750i Temperature Included in A 1 0 000 of RDG Head Pressure 0 25 in 0 0007 of RDG Control in Passive Control 0 000 of RDG A 6 Vacuum Reference Zeroing Sensor 0 000 inHg A 7 Two Sigma Expanded Uncertainty RSS 0 0055 RDG amp RSS 0 0091 RDG 4 0 0012 0 0012 inHg inHg AS Environmental ee A 5 RUSKA 7750i Users Manual Specifications General Specifications A 6 Pressure Range Internal Volume Custom Ranges Display Display Resolution Electrical Power Operating Temperature storage Temperature Humidity Dimensions Weight Standard Pressure Units Pneumatic Ports Relief Valves Supply Pressure Supply Vacuum Ingress Protection EMC Electrical Safety Pressure Safety Interface Standard available ranges Ps 32 inHg Abs 0 to 1085 mbar Abs or 40 inHg Abs 0 to 1355 mbar Abs Qc 32 inHg Diff 0 to 1085 mbar Diff or 68 inHg Diff 0 to 2300 mbar Diff Ps 24 in Qc 1 8 0 3 in Consult Factory 6 4 inch TFT Active Matrix Color ft 0 1 m 0 1 km h 0 1 knots 0 00001 Mach 100 120 VAC 220
26. are then shown below the sensor label On the RUSKA 77501 there are two primary sensors The first sensor that is shown is the Ps sensor To switch to the Qc sensor press the Sensor F6 function key Ensure that the correct screen is displayed labeled Ps Primary or Qc Primary depending on which channel is being calibrated To begin the calibration process press the Calibrate F2 button If the calibration access code 1s enabled enter it at the prompt The first calibration screen will appear Note To exit the calibration procedure before the calibration coefficients have been changed press CANCEL any time during the procedure Canceling restores all previous calibration values Step 1 I The first step automatically performs the sensor zeroing routing Please read the chapter in the manual regarding zeroing the sensors It is critical that a good zero is set in the calibration process The Ps sensor must be evacuated to less than 100 mtorr as read by the internal vacuum sensor and stable before proceeding with a zero It is recommended to start evacuating the Ps sensor during the warm up period Wait until the zero procedure finishes This may take several minutes When the ADTS completes step 1 the calibration screen will appear Maintenance 6 Calibration Step 2 1 To begin step 2 use the calibration standard to apply the various pressures that will be requested by the RUSKA 77501 The screen will display a table no
27. be modified by rotating the rotary knob clockwise to increase pressure and counterclockwise to decrease pressure Each increment or decrement will change the pressure in the least significant digit Continually rotating the rotary knob the pressure will continue to change until the rotation 1s stopped Menu 4 8 The menu key is used to access the less commonly accessed configuration type functions This accesses the Setup Calibration Test and Display functions gme14 bmp Figure 4 7 Menu Menu Local Operation 4 Menu Menu Setup Setup is used to configure the system It includes setting all of the limits user parameters user defined units of measure remote interface and system setup On the RUSKA 77501 the User and Limits screens are separate for each channel and must be set up independently The Units Remote and System screens are identical in each channel Any changes made in one channel immediate affects the other channel Note Units of measure are selected for each independent channel The Setup Units is used to set up the user defined units of measure gme15 bmp Figure 4 8 Menu Menu Setup Menu Setup Limits The Menu Menu Setup Limits menu is used to setup all of the limits in the system The pressure limits can be used to protect the device under test DUT from overpressure All limits are defined separately for each channel Press the Mode key to switch between two pressure channels The
28. changes between units of measure e Previous exits the current menu and returns to the previous menu 4 1 RUSKA 7750i Users Manual 4 2 4 Rotary Knob selects a field for editing and is used for small pressure changes pressure jog at the main menu of the single display mode Control Ps Go to Ground Leak Test Control Qc Dual Channel Dis play Mode Places Ps and Qc in Control mode press again to place Ps back to Measure Controls both channels safely back to ground Performs Leak Test Places Ps and Qc in Control mode press again to place Qc back to Measure Goes to single channel display mode Single Channel Dis play Mode press MODE key to toggle channels Control Ps Places Ps or Qc in Control mode depending on selected channel Vent Ps Places Ps or Qc in Vent mode depending on s elected channel StepNog Steps or jogs pressure Enter Menu state Enter S etup menu Limits Set high low amp slew limits control mode control band and access code User Set step size head correction filter and display digits Units Define user defined units of measure Remote Set baud parity data bits stop bits GPIB address System S et date and time reset machine view software version Calibrate Enter Calibrate menu Zero Zero sensor Calibrate Enter calibration adjustment menu Zero All Zero s both quartz sensors Sensor Selects
29. in trouble shooting potential problems Please refer to Chapter 6 Maintenance for more details Menu Test Remote Test The Menu Menu Test Remote section of the system 1s used to perform a number of the diagnostic functions on the remote interface It can be used to display the transmitted and received messages that are sent across the interface This can be a powerful tool to assist in identifying the source of communication problems The Menu Menu Test Remote menu displays information from the IEEE 488 interface Pressing the Serial 1 F2 or Serial 2 F3 keys will display information from the serial ports 4 18 Local Operation 4 Menu gme24 bmp Figure 4 17 Menu Menu Test Remote GPIB Menu Test Shop1 The Menu Menu Test Shopl menu of the system is used to display the current status of the various valve positions in the system This menu is primarily used for diagnostics and will be discussed further in Chapter 6 Maintenance Test Closed Zero Closed Low Closed gme25 bmp Figure 4 18 Menu Menu Test Shop1 4 19 RUSKA 7750i Users Manual Menu Test Control The Menu Menu Test Control menu of the system 1s used to tune the controller On new instruments the controller is tuned at the factory and therefore the user should not need to access or make any adjustments to the controller using this menu This menu is user accessible in order to provide a mean
30. of Uncertainty in Measurement This statistical approach combines all of the uncertainty components in quadrature RSS In this approach it 1s important to define the level of confidence that all of the uncertainty components are defined For instance all of the uncertainty specifications that Fluke publishes are at the 2 sigma level which would be at a 95 confidence level Some manufacturers may state their uncertainty at different confidence level and therefore you would need to be able to convert from one to the other in order to compare the two devices For instance if a manufacturer states that they have an uncertainty of 0 005 FS and that the uncertainty is expressed at the 1 sigma level then it would be doubled to express it at the 2 sigma level 1 e 1t would be an 0 01 FS device at a 2 sigma or 95 confidence level Controller Specification When the system 1s in control mode the control noise is defined as how close the controller can maintain the control pressure to the commanded set point In the active control mode the RUSKA 77501 has a control noise specification of 0 001 of Full Scale In the Passive control mode since the controller shuts off when it reaches a user defined band about the commanded set point the uncertainty of the pressure measurement is not influenced by the controller The following tables are uncertainty analysis examples for a RUSKA 77501 based on a three month and a yearly calibration Tab
31. port The commands can be terminated by a carriage return hexadecimal 0D or a line feed hexadecimal 0A The responses are always terminated by a carriage return followed by a line feed The serial port also supports XON XOFF When the XOFF hexadecimal 13 command is received the ADTS will stop transmitting Transmission is restarted when the XON hexadecimal 11 command 1s received When only one unit is attached the Control C hexadecimal 03 command will clear the transmit and receive buffers and disable addressing When addressing 1s disabled the unit will respond to commands without being addressed Sample Programs Sample Program 1 RUSKA 7750i GPIB IEEE 488 Controls Pressure to 20 000 FS A E ee Sample Program 1 7750 GPIB IEEE 488 d Controls pressure to 20 000 FS E Hinclude lt stdio h gt Hinclude lt stdlib h gt include lt string h gt Hinclude lt conio h gt include decl Hh C MTS int device GPIB Device descriptor char buffer 256 buffer for input output strings double pressure Pressure read from unit int status Status register from unit int check errors void void write 7000 char s void request 7000 char s void main void char p I EE Initialize GPIB Interface Leech EE Mum Mum eue ue S or device ibdev 0 First GPIB Board 4 GPIB Address of 7010 NO SAD No secondary addr
32. procedure a b C Control Ps to close to Atmosphere and Qc to zero at the current rate Measure actual atmospheric pressure Control Ps to measured atmosphere Open Ps Vent and Pt Equalize valves Theory of Operation 2 Control Strategy Control Mode Pneumatics Pressure Supply Port The Pressure Supply Port connects the user s regulated gas supply to the Pneumatics Module Please refer to Appendix A for gas specifications and supply pressure limits The supply pressure is connected to the right hand port of the rear chassis This regulated pressure should be set to the full scale Pt range 10 psi 0 7 bar Internally this pressure is regulated down further to supply the Ps control manifold Vacuum Supply Exhaust Port The system can be operated with a single vacuum pump Select a vacuum pump with the test port volumes and system slew rates in consideration A high capacity vacuum pump is required to allow the unit to be zeroed The minimum requirements are noted in Appendix A The vacuum pump must be fitted with an auto vent solenoid valve that vents the vacuum to atmosphere if the power to the pump is interrupted Pressure Control Pressure control is performed by a dual loop control system The inner loop is a digital loop using a high frequency response silicon strain gauge sensor a digital controller and two pulse width modulated solenoids The two solenoids either add gas to the test port or remove it The oute
33. scale as a pressure supply The pressure supply must be regulated and meet all of the criteria stated in Appendix A of this manual Never apply more than 110 of the ADTS s full scale to the test port Never try to control while a pressure source is connected to the test port Do not expose the instrument to thermal and mechanical shock or vibration This may affect performance and require re zeroing see Chapter 1 Safety Information Powering Up the ADTS Plug the power cord supplied with the ADTS into the power connector on the back panel first A Caution Grounding for the ADTS is provided through the power cord Then plug the power cord into a receptacle rated for any AC voltage between 90 and 260 volts If a different power cord 1s necessary for your receptacle consult Table 1 2 for available power cords Finally turn on the ADTS by toggling the power switch on the back panel When the MEASURE screen appears on the display the front panel will be fully operational 3 2 Installation 3 Pneumatic Connections Observing the ADTS s Full Scale Rating The full scale pressure range of each channel of the ADTS is noted on a label on the front panel of the instrument The label denotes the pressure range for Ps and for the Qc channel Pneumatic Connections The following sections discuss each port All ports are 1 4 inch NPT pipe fittings See Figure 3 1 Remove all plastic shipping plugs from the back panel pneumatic port
34. short term drift since the instrument can be re zeroed without performing a full calibration as required to correct for long term span drifts The magnitude of zero drift can be assessed based on the length of time between re zeroing the instrument Uncertainty of the Standard Uncertainty of the Standard 1s used to calibrate the transfer standard This is the expanded uncertainty of the calibration standard that was used by the manufacturer to calibrate the digital transfer standard This should be the expanded uncertainty of the calibration standard and include all sources of uncertainty that would influence the calibration standard including the uncertainty from the National Standards Laboratory that the standard is traceable It should also be noted that when the instrument is re calibrated the uncertainty of the device is influenced by the uncertainty of the calibration standard that will be used to perform the re calibration Therefore the uncertainty analysis should be evaluated following each re calibration If the instrument is re calibrated using a different calibration service provider than the manufacturer the uncertainty of the standard that the calibration service provider used to perform the calibration would need to be substituted for the manufacturers calibration uncertainty that was used in the original uncertainty analysis Environmental or Installation Influences Environmental or installation influences that could cause err
35. vent controls the pressure to atmosphere at then vents the pressure to atmosphere Control Band 4 10 There are two common pressure control approaches that are available with the RUSKA 77501 ADTS One of the most common control styles is an Active controller where the controller remains operative and holds the pressure at a commanded set point This allows the system to hold the pressure at a set point within the control stability specification See Appendix A In addition to possible leaks in a system following a pressure step the pressure in the system changes due to temperature effects When operating an Active control system the controller continuously monitors any pressure variances in the system and compensates for these effects to hold the pressure at the set point The benefit of the Active control 1s that it can maintain the pressure at the commanded set point even when there are slight leaks in the system or the system is not thermally stable The second approach is to control the pressure in the system to a set point and then to shut off the Active controller This 1s known as Passive control mode Following a pressure step and the controller becomes passive the pressure will continue to change in the system due to thermal effects However these thermal effects will stabilize over time Once the system has thermally stabilized pressure measurements can be made in the system without any pressure noise injected into the system as
36. 488 Interface The ADTS s IEEE 488 GPIB interface card which plugs directly into the Back plane Board provides the ADTS with an IEEE 488 interface This interface allows the user to automate the measurement and control processes Front Panel The Front Panel contains the active matrix TFT color display rotary knob and rubberized keys used to operate the ADTS Pneumatics Module The ADTS s pneumatics module includes an absolute mode pneumatic module for the Ps channel and a differential pneumatic module for the Qc channel The output of the Ps channel controls the pressure to the reference of the Qc differential channel The Total Pressure Pt value is derived from the addition of the Ps and Qc sensor values 2 3 RUSKA 7750i Users Manual The valves and transducers that make up the pneumatics module are shown in Figure 2 2 In the sections that follow the Zero Isolation Apply and Release valves are all 24 volt DC solenoid valves that are either open or closed depending on the ADTS s operational mode Their behavior is summarized in Table 2 2 Table 2 2 Solenoid Valves States awe essence vont Lagu ze Measure Mode Pneumatics Figures 2 2 and 2 3 summarize the Pneumatics of the ADTS Qc Reference The Reference side of the true differential Qc sensor is internally tied to the test port of the Ps sensor The Reference side of the Qc sensor is isolated from the Pt Test Port by a solenoid valve that is closed
37. ATe ON OFF LIMit LOWer number SLEW number UPPer number VENT number PRESsurell LIMit LOWer number SLEW number UPPer number VENT number Altitude Airspeed Mach Ps Pressure Qc Pressure Pt Pressure Altitude instant rate Airspeed instant rate Mach instant rate Ps instant rate Qc instant rate Pt instant rate Ps Sensor Temperature Qc Sensor Temperature Altitude timed rate Airspeed timed rate Mach timed rate Ps timed rate Qc timed rate Pt timed rate Ps Vacuum Tare Ps Sensor Tare State Ps low pressure limit Ps slew rate limit Ps high pressure limit Ps auto vent limit Qc low pressure limit Qc slew rate limit Oc high pressure limit Qc auto vent limit LIMit MAXimum PRESsure ALT lt number gt PRESsure CAS lt number gt PRESsure MACH lt number gt PRESsure PS lt number gt PRESsure QC number PRESsure PT lt number gt RATE ALT lt number gt RATE CAS lt number gt RATE MACH number RATE PS number RATE QC number RATE PT number MINimum PRESsure ALT lt number gt PRESsure CAS lt number gt PRESsure MACH lt number gt PRESsure PS lt number gt PRESsure QC lt number gt PRESsure PT lt number gt CALibration MODE MODE number DRY ABORt INITiate PRESsure ZERO ALL VACuum number INITiate STOP WAIT lt minutes gt lt seconds gt PRESsure
38. D E Oven Be E EE Pressure Reading and Correction oooooooonononcnnnononononononnnnnonononononononnnonnnonoss 3 INSTALO ERES SS eeneg NR A RE RE e EE Powerine Wy 1S ADI Sesa Observing the ADTS s Full Scale Rating Pneumatic Connectonsg dier Sida E E E aTe EE SrUEE aN Pressute e GE Supply Vacuum POR WE Ps PE Test E b E epi ICA EE 4 Local CDGM AE OM anki E Local E AA PP Dual Channel Display SCUeeti ecce pe brun tret p E EUR XRn ER ERREUR saE Pris pO FPUR eK pPHE Control Psand Control QG 5s sire cedadacecutccereseraiachabstonsesetedadeonteomtecesasesaagsacascias EN o E I wg single Channel Display Screen Lorie dieat tiran on o Changing Units of eet dees degen eege Selecting EE Controlling EE Setting the Pressure Set Point Entering Exiting Control Mode wr Aa Stepping Setting Step Size Menu Setup Menu Setup Limits Menu Setup User Menu Setup Units Menu Setup Remote Menu Setup System Menu Calibrate Calibration Password Zeroing Menu Test Menu Test Self Test Menu Test Remote Test Menu Test Shopl Menu Test Control esos eir Port btIeEPRH eR ERIP ERIS EPRP ie FERPPRIPEPPM TRE tai IVS nTWEEIc uM Menu Display Temperature Menu Display Nacuum nnn nnn nnn nnn nana nns Menu Display Blank
39. E Gen ewe ee EE la while kbhit if request 7000 serial MEAS STAT OPER COND Mn printf Timeout Wn continue pressure strLod buffer amp p status ator GR 15 check errors 3 continue if status amp 0x10 printf Pressure 9 31fMn pressure if status amp 2 0 break E AS Se E A ee eee e Reset 7750 to Measure mode 7 OUTP MODE MEASURE Enter Measure mode AAA ee A AA A a E write 7000 serial OUTP MODE MEASURE n check errors earn Me unm Mn Reset Serial Interface E ME E CNET EM EMT a ey ey SS Sees Se Se E E eS e da EE GE ana a E da a E eee ee eee Se E Se check errors display all 7750 error messages return TRUE if any errors were found eene aes Ee Ss rn see ss oS ese ee SSeS Sse se e erg Ve e e ease a ese int check errors void unsigned char status7 int retval ya ye ee es ee ee ee ee a Check for 7750 Errors I retval 0 while kbhit if request 7000 serial STB n printf Timeout Wn return TRUE j status7 atoi buffer if status7 4 0 Check error bit break retval 1 request_7000_serial SYST ERR n Get error message 7 printf buffer j return retval Lig nud ad sce fs es eor ase ud ve e ries Ans as ad ie EE serial int receive interrupt for serial port
40. L BOARD2 MICROPROCESSOR Electronic Module Figure 2 1 ADTS Block Diagram BOARD IEEE 488 gme02 eps RUSKA 7750i Users Manual Power Supply The ADTS s universal power supply accepts AC voltages from 100 120 VAC and 220 240 VAC at 50 60Hz This quad output supply produces 5 VDC 12 VDC and 24 VDC which are distributed to the Control and Backplane Boards Electronics Module Back Plane Board The Back plane Board is used to interconnect all of the plug in electronic boards and distribute power The Microprocessor Board the Digital Control Board and the IEEE 488 Interface all plug into the Back plane Board The Front Panel communicates with the Microprocessor Board via cables The Sensor Board communicates with the Microprocessor board through an internal RS 485 serial communication bus Microprocessor Board All of the ADTS s software resides in nonvolatile programmable read only memory Flash EPROM on the Microprocessor Board which plugs directly into the Back plane Board This software contains all of the instructions that operate the ADTS as well as the conversion factors that the ADTS uses to translate the internal pressure unit of measure of kPa into the units selected by the user These factors are given in Table 2 1 Data that is subject to change after the ADTS leaves the factory is held in electrically erasable programmable read only memory EEPROM This includes the current units of meas
41. Menu Setup User menu is used to setup all of the user specific configurations This includes setting the control step size range of bar graph pressure gas head display pressure filter display resolution digits and audible key click The step size bar graph max ready tolerance and gas head are defined separately for each channel All other entries are common for both channels Press MODE key to toggle between the Ps and the Qc channels le Bargraph Max nHg d d Ready Tolerance ing Jin above CDU MEET a inHg Las Head Di ee above Hey Glick gme18 bmp Figure 4 11 Menu Menu Setup User Step Size In addition to entering the pressure set point by the key pad the pressure set point can be changed using the step function The step function is used primarily when the operator is taking pressure steps in equal pressure increments The size of the pressure step is user defined From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 Menu F6 Setup F2 and then User F2 Using the rotary knob move the cursor to highlight Step Size Enter the desired step size in the current pressure units and press ENTER Bar Graph Maximum The bar graph on the Main Menu screen can be scaled to match the device under test by setting the full scale value of the bar graph Local Operation 4 Menu Ready Tolerance A Ready indication is generated when in control mode and the measured pressu
42. OB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA ARISING FROM ANY CAUSE OR THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court or other decision maker of competent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Fluke Europe B V P O Box 9090 P O Box 1186 Everett WA 98206 9090 5602 BD Eindhoven U S A The Netherlands 11 99 To register your product online visit register fluke com 7750i Change Language Hold D key for 5 seconds Table of Contents Chapter Title 1 General Information ainia Io ducado End How to EE Mid m eege ee os ee SIC o Keep Away From Live CITCUITS oococcccccccnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnss Do Not Service or Adjust AIOne ccccccccccccccccccccececcccceccccccnecccccccecececenees TEE e Electro Static Discharge Sensitive Parts EE
43. Particle Filters Refer to Appendix A for air supply quality requirements During normal operation the ADTS transfers gas both into and out of the device under test DUT When necessary the user 1s expected to use and maintain an in line disposable particle filter to protect the ADTS s pneumatics from any contamination that may exist in the DUT Vacuum Pumps 6 2 Periodic checks of the user s vacuum pumps for oil levels It is very highly recommended that a power down vacuum venting valve is installed onto the vacuum pump to ensure minimal chances of oil contamination from the vacuum sources These are normally open solenoid valves that are powered through the vacuum pump power switch When the vacuum pump is turned on the solenoid valve is energized and closes allowing the pump to operate normally When the pump is turned off power is removed from the solenoid and the vacuum is vented to atmosphere Periodic changing of vacuum pump oil should also be done as recommended by the vacuum pump manufacturer Maintenance 6 Calibration Processor Battery The processor board uses a lithium battery to maintain time and date information This battery has a varying life If the instrument is left on 24 hours a day it may last 5 to 10 years If the instrument is stored it may only last one year Annual replacement is recommended To replace the battery 1 Turn off power and remove the instrument cover See Chapter 6 Removing the ADTS s Co
44. Photocell Zeroing Ps Absolute Sensor VAC Level A high capacity vacuum pump must be connected to the rear vacuum port The RUSKA 77501 has a Vacuum Sensor mounted internal to the primary sensor housing that monitors the vacuum level of the Ps sensor when the sensor is being zeroed This sensor reading will display a value of 350 mtorr when the vacuum level is at or greater than 350 mtorr l pe xe ot do XM select the desired vacuum units using the UNITS key You can change both the unit of measure that the ADTS is displaying Pressure and the unit of measure for the vacuum sensor It is not required to have the ADTS displaying pressure in the same unit of measure as the vacuum sensor To change the unit of measure for the Vacuum sensor press the UNIT key and then the Vacuum F2 key Enter the Calibration screen by selecting MENU MENU CALIBRATE Select Zero F1 DO NOT press the Calibrate button When initiating the zeroing command in the ADTS it will cycle the internal valves allowing the external vacuum pump to pull a hard vacuum on the RUSKA sensor It is recommended that the sensor be pulled down to a vacuum of less than 100 mtorr preferably less than 60 mtorr in order to obtain a proper zero The ADTS can be zeroed at higher vacuum levels however the uncertainty of vacuum sensors tend to increase at higher vacuum levels therefore the uncertainty in the ADTS would also increase if zeroed at higher vacuum levels Wait f
45. S The IEEE 488 interface conforms to the following standards ANSI IEEE Std 488 1 1987 IEEE Standard Digital Interface for Programmable Instrumentation ANSI IEEE Std 488 2 1987 IEEE Standard Codes Formats Protocols and Common Commands SCPI 1991 0 Standard Commands for Programmable Instruments IEEE 488 The following identification codes define the interface capabilities of the ADTS Identification codes are described in the IEEE 488 standard SHI Source Handshake Complete Capability AH1 Acceptor Handshake Complete Capability T5 Talker L3 Listener SR1 Service Request Complete Capability RL1 Remote Local Complete Capability PPO Parallel Poll No Capability DC Device Clear Complete Capability DTO Device Trigger No Capability CO Controller No Capability The IEEE 488 interface is installed next to the processor board The interface is identified by the IEEE 488 standard connector on the back panel of the unit Note Do not change any jumpers or switch settings on the IEEE 488 interface board The IEEE 488 address is set by the MENU SETUP REMOTE Screen 5 1 RUSKA 7750i Users Manual RS 232 The RS 232 interface supports standard serial operation from a computer to a single ADTS RS 232 supports the IEEE 488 2 and SCPI commands The ADTS allows the following port setups Baud Rate 1200 2400 9600 or 19200 Data Bits 7 or 8 Parity Even Odd or None Stop Bits 1 or 2 Handshaking XON XOFF
46. Standard Commands for Programmable Instruments Version 1991 0 Table B 1 Summary of Error Messages Co fem Remote Required 221 Settings Conflict The command could not be executed due to the current state of the ADTS Some commands cannot be executed while a program self test or calibration is in progress 286 Program Runtime Error An error occurred while running the program Usually the set point is out of range Calibration Data Lost The calibration data has been lost and the unit must be recalibrated 315 Configuration Data Lost The configuration data has been lost Check all parameters to be sure they are correct RUSKA 7750i Users Manual Table B 2 Summary of Error Messages continued Value Description and Corrective Action 330 Self Test Failed Check the display for the test that failed 350 Queue Overflow The error queue was full and messages were lost 400 Query error A read request was received when there was nothing to read 500 Controller Malfunction Internal control failure 501 High Limit Exceeded The pressure was greater than the high limit 502 Low Limit Exceeded The pressure was less than the low limit 503 Slew Limit Exceeded The pressure changed faster than the slew limit allowed 504 Negative Qc Limit Exceeded 505 ARINC Limits Exceeded 521 Pressure Over Range The pressure reading is outside the range of the DPC 531 Oven Temp Over Range Either the transistor that drives
47. Zero F1 Do NOT press the Calibrate button 6 Select the Mechanical Zero F1 key Pressure 0 Out of Range Temperature 0 00 Stable Reference 0 000 Stable gme32 bmp Figure 6 5 ZeroSet Screen 7 Referring to Figure 6 8 slightly loosen the Allen screw on the back of the sensor bracket making sure to maintain a snug fit on the screw Using the T shaped Photocell Centering Tool part number 7750 111 adjust the photocells by placing the tool in the hole in the back of the sensor and turning the tool slightly The screen will show a number of horizontal lines The top yellow bar represents the current zero setting The bottom portion of the bar has a green bar in the center and two red bars on either end If the top yellow bar is over the red bar then mechanical zeroing is required If the yellow bar is over the green bar then no adjustment is required gme33 bmp Figure 6 6 Mechanical Zeroing Screen 6 10 Maintenance 6 Sensor Photocell Zeroing 8 Adjusting the photocell will cause the yellow bar to reduce in width It should be adjusted until the yellow line is as thin as possible over the green bar gme34 bmp Figure 6 7 Adjusting the Photocell 9 Tighten the Allen screw 10 Often when the Allen screw is tightened the zero will move Review the width of the yellow line again loosen the Allen screw and now offset the yellow bar the same width that you observed it moving from tightening the Allen scr
48. a result of having an Active controller in the system The result would be that the controller would not add any additional uncertainty to the pressure measurement since it would be inactive during the measurement process For this method pressure will not be at a cardinal set point When the Control Off Band is set to zero the ADTS operates in the Active control mode Setting a Control On and Off Band places the ADTS in the Passive control mode In Passive mode if the pressure is within the Control Off Band of the pressure set point the controller is turned off If the pressure changes to outside the Control Off Band the controller is turned back on Local Operation 4 Menu ARINC 565 Operating Limits The ADTS can be set to the ARINC 565 operating limits When this is selected as YES the ADTS ignores the user defined minimum and maximum airspeed and altitude limits and enables the ARINC limits These limits are defined in the Limits Screen shown in Figure 4 9 Supply Correction If the supply pressure is set at a value less than the value recommended in A 2 of Appendix A then the control performance may be affected In this case the Supply Correction can be set to yes and the ADTS will adjust its internal control parameters to compensate for the lack of supply pressure For best performance it is recommended to supply the ADTS with the full recommended supply pressure and to have the Supply Correction set to no A G o
49. apable of rendering aid and resuscitation is present Resuscitation Personnel working with or near dangerous voltages shall be familiar with modern methods of resuscitation Such information may be obtained from your local American Medical Association Electro Static Discharge Sensitive Parts A Caution Electrostatic discharge sensitive ESDS is applied to low power solid state parts which could be damaged or destroyed when exposed to discharges of static electricity Maintenance personnel are often not aware that an ESDS part has been damaged or destroyed because electrostatic discharges at levels less than 4 000 volts cannot be seen felt or heard Compressed Gas Use of compressed gas can create an environment of propelled foreign matter Pressure system safety precautions apply to all ranges of pressure Care must be taken during testing to ensure that all pneumatic connections are properly and tightly made prior to applying pressure Personnel must wear eye protection to prevent injury Personal Protective Equipment Wear eye protection approved for the materials and tools being used Inert Gases Operation of pressure equipment may be accompanied by the discharge of inert gases to the atmosphere The result is a reduction of oxygen concentration Therefore it 18 strongly suggested that exhaust gases not be trapped in the work area A Warning If the equipment is used in a manner not specified by the manufacturer the protecti
50. cal tube as shown in Figure 2 4 The mirror reflects the light back through the window and strikes two matching photodiodes When there is zero pressure differential across the helical tube the photodiode assembly is mechanically adjusted so that the light spot is centered between each photocell In this zero position the outputs of the two photodiodes provide energy used to maintain the quartz assembly in its zero position thus a force balance is created 2 7 RUSKA 7750i Users Manual As pressure 1s applied in the helical tube the entire apparatus attempts to rotate This causes the mirror to move the reflected light spot to shine more on one photodiode than the other The Sensor Board see Chapter 2 Sensor Board section then responds by changing the current to the electromagnetic coils that through interaction with the permanent magnets force the helical tube to return to its zero position The amount of current required to do this 1s proportional to the pressure applied across the helical tube Thus the pressure is determined by the amount of current required to return the helical tube to its zero position On the Absolute Ps sensor the process is similar except that the Bourdon tube is permanently evacuated and sealed at the factory and the test pressure 1s applied to the sensor case With this configuration all test pressures are measured with respect to Vacuum TORSION HINGE ELECTROMAGNETIC PERMANENT MAGNET
51. ct the unit of measure for the Ps channel and then press the MODE key or the F6 Function key toggle to the Qc channel and change its unit of measure The second part of this tutorial uses the ADTS to generate pressure Both pressure and vacuum supplies must be connected and the test port must be connected to a closed volume in accordance with Chapter 3 Pneumatic Connections of this manual 4 From the Main Menu use the numeric keypad to enter the starting pressure The pressure 1s entered in the units set in the previous exercise As the pressure 1s entered each digit will be displayed in the numeric scratchpad the highlighted box in the lower section of the display If a mistake is made press the CLEAR key found in the numeric keypad and the numeric scratchpad will be cleared RUSKA 7750i Users Manual 9 10 gme13 bmp Figure 4 6 Single Channel Display Main Menu When the entry is correct press the ENTER key The scratchpad will be cleared and the value will appear as the new set point Now that the starting pressure is entered enter Control mode Press Control F2 The CONTROL label will be highlight and the message Press Enter to Confirm will appear below the scratch pad Notice that the upper left corner still Shows MEASURE The ADTS stays in Measure mode until the change is confirmed Press ENTER to confirm the mode change The upper left corner will change to CONTROL and the pressure will start movin
52. dout with a wide viewing angle During normal operation the measured pressure is easily visible from a distance of 10 feet 3 meters Adjustable Pressure Display The pressure display may be adjusted to show one decimal greater than or less than the default resolution Ease of Operation An intuitive menu driven interface makes the ADTS easy to use Frequently used selections such as the units of measure are restored to memory each time the ADTS powers up Easily Programmable The ADTS s powerful microprocessor provides the basis for smart electronics With a few simple keystrokes the user can set limits on the system pressure create unique units of measure and more Modular Design The sensing element pneumatics electronics and user interface are separated into modules making maintenance faster and easier Attractive Desktop Packaging A sturdy aluminum case houses all of the ADTS s pneumatics electronics and user controls With the optional rack mount kit this standard 19 EIA chassis fits easily into a rack mount system Power On Self Test Upon power up the ADTS quickly tests its hardware and software After the ADTS completes this test the user can select more extensive self tests for the pneumatics and electronics Ease of Calibration Calibration may be performed either remotely or entirely from the front panel No disassembly is required and there are no potentiometers to tune Only a five point calibration is requir
53. during the ADTS s Measure and Control modes When the user commands the ADTS to perform the zeroing process the solenoid automatically opens and the pressures on the Reference and Test Ports of the Qc sensor become equal On the permanent absolute Ps sensor the Ps zeroing valve allows a vacuum to be pulled onto the Ps test port allowing the instrument to zero at a low vacuum level Test Port 2 4 The Test Port connects the DUT to the Pneumatics Module The RUSKA 77501 has two test ports one for the Ps and for the Pt channel The Test Port is isolated from the DUT by a normally closed solenoid valve that is open during the ADTS s Measure Control and Vent modes and closed during the zeroing process Each Test Port is protected by a relief valve Theory of Operation 2 Pneumatics Module CONTROL SENSOR CONTROL SENSOR SENSOR RELIEF PRESSURE REGULATOR PRIMARY Qc SENSOR ZERO VALVE PRIMARY Ps SENSOR gme03 eps Figure 2 2 RUSKA 7750i ADTS Pneumatics Model 2 5 RUSKA 7750i Users Manual Ps PRIMARY SENSOR SENSOR Ps APPLY CONTROL SENSOR SS Pt EQUALIZE PRESSURE REGULATOR OY CONTROL SENSOR OY Ps RELEASE amp Pt APPLY 3M Pt TEST Ps TEST Ps TEST PORT PLTEST PORT PRESSURE SUPPLY VACUUM SUPPLY gme04 eps Figure 2 3 RUSKA 7750i ADTS Pneumatics Schematic Diagram Go to Ground or Vent Procedure The Go To Ground is implemented as a multi step
54. e PS number PRESsure PT lt number gt PRESsure QC number PRESsure number CONTrol OFF number ON number SLEW number TOLerance number PRESsurell1 number CONTEO OFF number ON lt number gt SLEW number TOLerance number RATE ALT lt number gt RATE CAS lt number gt RATE PS lt number gt RATE PT lt number gt RATE QC number STATus OPERation EVENT CONDition ENABle number QUEStionable EVENT CONDition ENABle Soyo Lem BEEPer lt freq gt lt length gt DATE lt year gt lt month gt lt day gt CERRO Error KLOCk ON JOFF 1 0 TIME lt hour gt lt minute gt lt sec gt VERSion LANGuage COMP 6610 SCPI PRESet COMMunicate SERial RECeive TRANsmit BAUD number PARITY EVEN ODD NONE BITS 7 8 SBITs 1 2 GPIB ADDRess number TEST ELECtronic STOP UNIT AERonautical FTKNTS AERonautical FTMPH AERonautical MKPH AERonautical MKPH M min AERonautical MKPH M s AERonautical MKPH hM min DEFine lt n gt lt name gt lt number gt DISPlay lt name gt DISPlayll lt name gt Mach limit disable Altitude Setpoint Airspeed setpoint Mach Setpoint Ps Pressure setpoint Pt Pressure setpoint Qc Pressure setpoint Ps pressure control setpoint Ps Control Off band Ps Control On band Ps slew rate Ps output tolerance Qc pressure control setpo
55. e Request Enable Register SRE is used to generate service requests on the IEEE 488 bus If a user sets a bit in this register when the instruments sets the corresponding bit in the Status Byte Register STB a service request is generated SRE status Byte STB Bit7 Operation Summary Bit6 Service Request Bit5 Event Summary Bit4 Message Available Bit3 Questionable Summary Bit 2 Error Available Bit reserved BitO reserved Event Status Register ESR Bit 7 Power lost Bit6 reserved Bit5 Command error Bit4 Execution error Bit3 Device error Bit2 Query error Bit reserved Bit 0 Operation Complete Operation Status Register STAT OPER Bit 14 Program running Bit 13 reserved Bit 12 reserved Bit 11 reserved Bit 10 reserved Bit9 reserved Bit8 Self Test running Bit7 reserved Bit6 reserved Bit5 reserved Bit4 Measuring Bit3 reserved Bit2 Qc Settling Bit Pe Settling BitO Calibrating Questionable Status Register STAT QUES Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Command Warning reserved reserved reserved reserved reserved Pressure reading questionable Pressure not calibrated reserved reserved reserved Oven temperature questionable Time not set reserved Supply voltages questionable Remote Operation Device Messages 9 5 9 RUSKA 7750i Users Manual Serial Operation The RS 232 port accepts the same SCPI commands as the IEEE 488
56. ed to fully characterize the Ps range and a seven point calibration for the Qc range Automatic Zero Adjust At the user s request the ADTS s software automatically performs the zero adjustment with no potentiometers to tune Automatic Head Correction The ADTS automatically corrects for head pressure between the ADTS and the device under test DUT taking into account the density of the test gas e g air or nitrogen Choice of Medium Although the ADTS is not sensitive to the type of gas used within the system the user can select either instrumentation air or nitrogen allowing the ADTS to automatically make pressure head corrections General Information 1 Standard Equipment amp Options Choice of Display Units Standard units include inHg at 0 C and 60 F kilopascals bar psi 1nH5O at 4 C 20 C and 25 C kilograms per square centimeter mmHg cmHg at 0 C and cmH5O at 4 C Altitude and airspeed units include feet meters mach knots and kilometers per hour In addition to these predefined units two user defined units are programmable Communications Interface The ADTS includes standard RS 232 serial and IEEE 488 interfaces The user s computer communicates with the ADTS through the Standard Commands for Programmable Instruments SCPI protocol Standard Equipment amp Options A standard ADTS includes this manual and a power cord The following options are also available Rack Mount Kit This 6 969 k
57. essing TIS 1 Second Timeout 0 No automatic EOI for transmit REOS LF Terminate read on Line Feed if ibsta amp ERR printf GPIB Driver not installed n return m O C O L Q Initialize 7750 Interface pe a7 UNIT FS Set units to percent of full scale PRES 20 0 Set control setpoint to 20 FS PRES TOL 0 001 Set control tolerance to 0 001 FS OUTP MODE CONTROL Enter control mode EE write 7000 UNIT FS PRES 20 0 TOL 0 001 OUTP MODE CONTROL An it check errors Ll 29 ibonl device 0 return Remote Operation Sample Programs II IMMINENTE E EE Read pressure status until setpoint is reached p p E ui MEAS Read pressure STAT OPER COND Read status setpoint PP clc Bose Se Se Ee while kbhit request 7000 MEAS STAT OPER COND Mn pressure strtod buffer amp p status atoi p Lr check errors t continue if status amp 0x10 printf Pressure 9 3lfAn pressure if status amp 2 0 break c net ety nca c A E Reset 7750 to Measure mode ds el OUTP MODE MEASURE Enter Measure mode AAA AO Leet ae ee Re irl A Ee write 7000 OUTP MODE MEASURE n check errors mcam n a ML ES au SS Reset GPIB Interface
58. et GPIB Interface ee GG Cr Zero perform zero adjust of 7750 npn int zero void int cstat pstat tstat rstat Remote Operation Sample Programs clrecr 4 y cprintf Zeroing gotoxy 1 5 cprintf Pressure Reading gotoxy 1 6 cprintf Sensor Temperature gotoxy 1 7 cprintf Reference Pressure asi ex ect a ej eni fa rci ed es aet en itl ciet aetas Enter Zero Mode CAL ZERO INIT POEPEN EIEE EIEEE EEEE tet write 7000 CAL ZERO ALL INITMn NES d o EE A A EE E Wait for zero to complete STAT OPER COND Een n Ee E Ee EE ae ee do request 7000 STAT OPER COND Wn sscant buffer d amp status if check errors return 03 gotoxy KI 9 cprintf Zeroing j while status 1 0 goboxy 1 9 7 cprintf Zero Complete return 1 Hs EE sl a a check errors display all GPIB and 7750 error messages return TRUE if any errors were found HR ee ag se a ee ee a A E C MEC EM eae Int check errors void unsigned char status7 int retval T a ps fg a ae gee E ge a ge ee yee Check for GPIB Interface Errors dHO G if ibsta amp ERR cprintf GPIB Status 4X Error d r n ibsta iberr return 1 A EM EAE ELENA EN EE Check
59. eview the temperature and duty cycle of the oven by pressing the MENU MENU DISPLAY TEMP keys The unit must have been warmed up for a minimum of 3 hours prior to determining the condition of the oven temperature control The temperature of the sensor should be controlled to 50 C The Duty Cycle indicates the amount of time in units of percentage that the oven control is turned on in order to maintain the oven at the proper set point of 50 C A unit that is operating properly after it has fully warmed up should indicate a sensor temperature of 50 C and a duty cycle between 10 to 90 gme06 bmp Figure 2 5 Menu Display Menu Pressure Reading and Correction 2 10 The sensor s analog output is processed by an analog to digital circuit This output is corrected for the applied effects listed below The output is linearized and the resulting pressure value is corrected for the variations in head pressure vacuum case effect and oven temperature effects The following equations are used to adjust and correct the pressure signal Theory of Operation 2 Software Zero Coefficients CsH Zero correction for High FSR Full Scale Resistors Value is in counts 7 381 975 full scale of current sensor CsL Zero correction for Low FSR Value is in counts 7 381 975 full scale of low FSR HsZ Hardware zero correction 0 to 4095 center is 2048 SsZ Zero corrections scaling factor Ratio of High FSR to Low FSR Used only
60. ew and now offset it in the opposite direction by this same width 11 Again tighten the Allen screw Now the width of the yellow line should be minimized 12 Tap on the bracket with a screwdriver handle to relieve mechanical stress Continue to tap on the bracket until the counts stop changing 13 If the zero moved significantly as a result from tapping the bracket repeat this procedure as necessary 14 Reinstall plastic zeroing plug 15 After the unit has become thermally stabilized perform a normal instrument zeroing procedure Refer to Chapter 6 Sensor Photocell Zeroing INSERT PHOTOCELL CENTERING TOOL HERE ALLEN SCREW gme35 bmp Figure 6 8 Photocell Location RUSKA 7750i Users Manual Optimizing Control 6 12 The performance of the controller may be optimized for certain environments or performance criteria by adjusting the values available in the Control screen The Control screen is available from the Main Menu by pressing Menu F6 Test F5 Control F6 The Control screen is shown below gme36 bmp Figure 6 9 Menu Menu Test Control Note Be sure the Control Band parameter is set to zero Chapter 4 Menu Menu Setup Menu Setup Limits Auto Vent If the controller does not control optimally it would be recommended to first assure that the system is free of leaks and is operating within the external volume specifications see Appendix A You should verify that the instr
61. exceeded the ADTS 1s returned to Measure mode shuts off the apply and exhaust control valves and an error message is generated Additionally a vent limit may be set The ADTS will go to Vent mode when the pressure exceeds this limit Shut Offs Measure mode can be entered at any time by pressing the Measure key on the main keypad with no further acknowledgment required The ADTS will turn off the controller 2 9 RUSKA 7750i Users Manual Oven Control The oven temperature 1s controlled via a pulse width modulated signal The time the heater is on can be varied from 0 to 100 The pulse width at startup is initialized to the previous value that was stored in battery backed CMOS RAM The oven control is a PID controller updated approximately every 7 seconds The sensor readings are accessed by pressing MENU MENU DISPLAY TEMP The high accuracy quartz sensor is housed in a temperature controlled oven There is a 3 hour warm up time required prior to the ADTS operating at its optimum precision The user can verify when the instrument is thermally stable by viewing the MENU DISPLAY screen and verifying that the temperature is at 50 C In addition to the temperature this screen will show the duty cycle of the oven When operating the system in either a very cold or hot environment if the oven in unable to maintain the temperature of the internal oven the ADTS will generate an Oven Control Failure error messages The operator can r
62. eypad the pressure set point can be changed using either the step or the jog functions The Step function is used primarily when the operator is controlling pressure steps in equal pressure increments The size of the pressure step 1s user defined The Jog function is most often used when calibrating mechanical gauges and the operator wishes to change the pressure until the mechanical gauge indicates a cardinal point The operator can then read the higher resolution ADTS to determine the actual pressure value when the mechanical gauge is indicating a cardinal point The Step Jog the F5 key toggles between Step and Jog to switch between these modes press the function key 5 F5 Stepping Ensure that the word Step is highlighted in the Step Jog the F5 key Using the rotary knob rotate the knob clock wise to increase the set point or counter clock wise to decrease the controller set point The scratchpad will be updated to a new set point The step size defaults to 10 of full scale Press ENTER to accept the new set point Setting Step Size From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 Menu F6 Setup F2 and then User F2 Using the rotary knob move the cursor to highlight Step Size Enter the desired step size in the current pressure units and press ENTER Jogging Assure that the word Jog is highlighted in the Step Jog the F5 key From the Single Display Menu the pressure set point can
63. f the Device Under Test is either Above or Below the RUSKA 77501 The selected units will be highlighted and appear in the Gas Head description 6 Use the rotary knob to highlight the label Gas Head 7 Use the numeric keypad to enter the height in the selected unit 8 Press ENTER to accept the entry Atmosphere The nominal barometric pressure value for the location that the ADTS is utilized should be entered for atmosphere This number is used to calculate the density of the test port pressure medium and to correct for head pressure variances between the reference port of the ADTS and the DUT Pressure Filter Pressure Filter is used to adjust the degree to which the front display pressure value is filtered A value of four 4 1s the default value As the value increases the filtering level increases however the display update rate reduces Typical filter values would range between 1 to 10 For pressure sensors with full scale ranges of 1 psi 7 kPa or less a filter value up to 30 1s typically recommended 4 13 RUSKA 7750i Users Manual Changing the Number of Decimals Each unit has a default number of decimal places used for pressure display This may be adjusted up or down by one decimal place 1 The decimal digits are set from the Menu Menu Setup User From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 Menu F6 then Setup F2 and then User F2 Press the MODE key t
64. face Set Up The operator can set up the Baud Rate Data Bits Parity and Stop Bits for the Serial Interface Menu Setup System The System Menu identifies the Software release version that is being operated in the ADTS It also stores and allows the operator to edit the Date and Time elef 250x Ruska Instrument i Ps Software Version 2002 09 06 10 49 32 ORO3 2002 09 11 565 15 M M bee gme22 bmp Figure 4 15 Menu Menu Setup System Date Time The ADTS s system clock is continuously updated If the date or time requires editing the following applies 1 The date and time are set from the Menu Menu Setup System From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 Menu F6 then Setup F2 and then System F5 2 Tosetthe system date turn the rotary knob until Date is highlighted Use the numeric keypad to enter the current four digit year month and day yyyymmdd All digits must be entered Press ENTER to accept 3 To set the system time turn the rotary knob until Time is highlighted Use the numeric keypad to enter the current hour minute and second hhmmss All digits must be entered Press ENTER to accept Reset The Reset F1 command is used to re boot the ADTS To reset the system from the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 Menu F6 then Setup F2 then System F5 and then Reset F1 4 16 Local Ope
65. for 7750 Errors m ER retval 0 while kbhit ibrsp device amp status7 Serial poll if status7 amp 4 0 Check error bit break retval 1 request_7000 SYST ERR n Get error message cprintf buffer j return retval write 7000 write a command to the 7250 void write 7000 char s ibwrt device s strlen s 9 5 13 RUSKA 7750i Users Manual request 7000 write a query command and read the response Lum cu i void request 7000 char s ibwrt device s strlen s ibrd device buffer sizeof buffer Sample Program 3 RUSKA 7750i Serial RS 232 Controls Pressure to 20 000 AFS T E ig e E f Sample Program 3 7750 Serial RS 232 Ee x Controls pressure to 20 000 FS EE Hinclude lt stdio h gt include lt stdlib h gt Finclude lt conio h gt include dos h include lt time h gt Hdefine TRUE 1 Hdefine FALSE 0 define TIMEOUT CLK TCK 5 5 second timeout define XON 0x11 define XOFF 0x13 define CLEAR 0x03 define DLE 0x10 define QUEUE SIZE 1024 char buffer QUEUE SIZE butter for input output strings double pressure Pressure read from unit int status
66. g towards the set point After the pressure is stabilized assure that the word Step is highlighted in the Step Jog the F5 key The Step Jog the F5 key toggles between Step and Jog to switch between these modes press the function key 5 F5 In addition to using the keypad to enter a pressure set point the step function can also be used Using the rotary knob rotate the knob clock wise to increase the set point or counter clock wise to decrease the controller set point The scratchpad will be updated with a new set point The step size defaults to 1096 of full scale This step size is user defined and can be changed in the Menu Men Setup User menu Press ENTER to accept the new set point The ADTS will move to the new set point Press Measure located on the keypad The ADTS will change to Measure mode No confirmation is necessary to leave Control mode Selecting Language The RUSKA 77501 ADTS operates in a variety of different languages To select a different language press and hold the MODE key for 5 seconds The current language will be highlighted 4 6 Use the rotary knob to highlight a new language and press the ENTER key to select that language Local Operation 4 Controlling Pressure Controlling Pressure Pressing either the Control Ps or Control Qc function key places both channels of the ADTS into the Control Mode If it 1s desired to have only one channel in the control mode press either the Control Ps or
67. greater than 1 8 inch 3 mm ka e S ej LU H O u e B Ps Vent Pt Msximum a CH SUB e Pressure PtF S 10 psi 0 410 psi Ps Qc Li xe _ eem ge ev gme07 bmp Figure 3 1 RUSKA 7750i Back Panel Vacuum Sensor The ADTS has a vacuum sensor connected to the Ps sensor This sensor is used to zero the Ps channel 3 3 RUSKA 7750i Users Manual 3 4 Chapter 4 Local Operation Local Operation This section of the manual describes operation of the ADTS using the front panel local interface Abs Difference 0 min d BE Qc Measure Difference Ps Measure m SS 10000 feet Goto Setpoint 2000 Rate Set e 200 lt gt U Figure 4 1 RUSKA 7750i Front Panel 1 Color TFT display shows the system status and menu options 200 0knots aij 20999 gme08 eps 2 Function keys the label shown in the display identifies their function which will change based on the screen of operation Referred to in this manual as F1 through F6 top key considered to be F1 bottom to be F6 3 Numeric keypad comprises e Number keys with decimal point and change sign keys e Enter accepts the entered number or confirms a command e Clear clears the numeric entry field e Measure places both channels in measure mode e Mode switches to single display mode and toggles between the two channels when in single display mode e Units
68. gt lt seconds gt WAIT lt minutes gt lt seconds gt Oc last calibration time Oc last zero date Oc last zero time Oc enter zero mode Qc status for cal press temp ref Qc start zero calibration abort zero calibration perform calibration point number of calibration constants label value C0 0 123 set calibration constant nominal calibration point number of calibration points Zero sensor Ps Vacuum Vacuum Qc Ps Sensor Temperature Qc Sensor Temperature turns front panel display on off display message on front panel set Ps bar graph maximum set Qc bar graph maximum Ps mode Ps off MEASure on CONTrol Qc mode Qc off MEASure on CONTrol Ps Full scale value in units calibrated Ps Low cal point Ps gas head height Ps gas head medium Ps Pressure display resolution Returns to default resolution Qc Full scale value in units calibrated Qc Low cal point Qc gas head height Qc gas head medium Qc Pressure display resolution Returns to default resolution OFF WAITING TIMING TIMED Cancel rate timing Start rate timing Time Period for rate timing Wait Period for rate timing SOURCe GTGRound GTGRound LIMit ARINC ON OFF 1 0 Remote Operation 5 Device Messages Go to ground Returns 1 if safe at ground ARINC limit checking AIRCraft STANDARD MAX ARINC MACH ON OFF 1 0 PRESsure ALT lt number gt PRESsure CAS lt number gt PRESsure MACH lt number gt PRESsur
69. h accuracy quarts sensor This is achieved by running the Calibrate Auto Tune function Maintenance 6 Fan Operation Note Prior to performing any Auto Tune functions in an effort to improve the controller performance confirm that the system is a leak free system and the volume attached to the test port is within the recommended range see Appendix A Additionally assure that the system has adequate pressure and vacuum supply when required To perform these Auto Tune functions the instrument must be connected to a pressure supply with the pressure supply set to the proper supply pressure please refer to the specifications in Appendix A On absolute instruments a vacuum pump must be connected to the exhaust port Disconnect any device under test from the test port The test port must be connected to a sealed volume of 5 to 15 cubic inches 80 to 240 cc s Use the Rotary knob to select which Auto Tune procedure is to be performed and then press the enter key Select Full to perform the complete Auto Tune sequence If selected you are not required to run any of the other Auto Tune functions Press the enter key The ADTS with go through a sequence of controlling to various pressures and automatically adjusting the control parameters of the valves The ADTS will display a message indicating when it is complete with the Auto Tune procedure The time required to complete the Auto tune procedure can range anywhere from 1 to 2 hours
70. he pressure reading 1s the current unit of measure and mode Gauge Differential or Absolute The RUSKA 77501 is designed such that all of the commonly used functions are accessible by a direct key on the key pad or from a top level function keys Less commonly used set up type functions are accessible through the menu function keys gme11 bmp Figure 4 4 Single Channel Display Main Menu Tutorial 4 4 To begin the tutorial first verify that the ADTS is powered up and that the pneumatic connections have been completed It is generally easier to first operate the system in the Single Channel Display Screen as opposed to the Dual Screen Press the Menu function key to go to the Ps Channel screen Press the Mode key to toggle between the Ps Channel and the Qc Channel screens Ps Channel is recognizable by the dark blue background color and Qc Channel has a lighter background color Select Ps Channel to proceed with the tutorial The ADTS should display a screen similar to the one shown above The right hand side of the display shows the options At power up there may be errors relating to the default settings If an error message 1s displayed in red at the bottom of the screen press F6 then press PREVIOUS If multiple errors exist the F6 key must be pressed multiple times to clear all of the errors Figure 4 6 shows the Ps Channel Main Menu The double sized numbers in the top center of the display shows the current measured pressure
71. his 1s accomplished by supporting the ADTS between two foam cradles that are encapsulated within a double walled corrugated box The ADTS is restrained and supported but still has resilience The materials used in the packaging operation are foams that have a minimum impact rating of not less than N 95 A Caution Styrofoam poured foam in place mixtures and other rigid foams are not recommended If polyfoam or rubber foam other than that used in the original packaging 1s to be used cut it into strips so that it will not present a large rigid surface to the ADTS Fluke has found that corrugated cardboard boxes provide the best packaging exterior The box must have an impact rating of 275 lb and be of double walled construction This type of box will sustain most types of damage incurred during the shipping and handling process but ensures that the contents remain intact and damage free The foam cradle ensures that a minimum of 3 inches of foam separates the inner surface of the box and any portion of the ADTS 7 1 RUSKA 7750i Users Manual A Caution Wood or metal boxes do not absorb shock when dropped and therefore are not recommended If the original packaging and shipping materials have been retained use them for packing the ADTS If the ADTS is being packed for long term storage more than 30 days place a desiccant bag inside the box The ADTS must be prepared for shipment in the following manner 1 Fluke has an RMA
72. int Qc Control Off band Qc Control On band Qc slew rate Qc output tolerance Altitude rate setpoint Airspeed rate setpoint Ps rate setpoint Pt rate setpoint Qc rate setpoint read clear operation event register read operation condition register set operation enable mask read clear questionable event register read questionable condition register set questionable enable mask PRESet clear enable masks Freq ignored System date returns lt error descr info gt or 0 No keyboard lock System time SCPI protocol version returns 1991 0 set interface emulation reset pressure control Run Elec Self Test amp Return Result Abort Pneu Volume or Leak Feet Knots Feet Miles hour Meters Kilometers hour Meters Meters minute Meters Meters second Meters Hectometers minute Create Unit Ps Units on Display Qc Units on Display RUSKA 7750i Users Manual LENGth MM IN set length units head height PRESsure lt name gt Set pressure units TEMPerature C CEL F FAR K set temperature units VACuum MICRON MTORR PA lt name gt set vacuum units Units for this command are set by UNIT AER Example SCPI Commands To request the current pressure reading all of the following commands are equivalent MEASURE PRESSURE measure pressure MeAsUrE pReSsUrE meas pres measure meas MEAS To set the control pressure setpoint to 50 all of the following commands are equivalent SOURCE
73. it meets ANSI EIA requirements for a 4U 19 rack mount kit Lines and Fittings Kit This kit contains the pressure and vacuum lines and fittings to connect the RUSKA 77501 to the optional Fluke vacuum pump and to a gas bottle regulated with 1 4 NPT fittings Additionally this kit contains two flexible hose assemblies one for the Ps terminating to a female AN6 fitting and one for the Qc pressure port terminating to a female ANA fitting Additional Power Cords Additional power cords are available for most countries All options are summarized in Table 1 1 To order these items please contact Fluke Calibration in the U S at 713 975 0547 Table 1 2 RUSKA 7750i ADTS Options List A ra 1 5 RUSKA 7750i Users Manual 1 6 Introduction Chapter 2 Theory of Operation The ADTS s power supply electronics pneumatics and sensor combine to form a complete stand alone measure and control instrument This Chapter of the manual describes the ADTS s component modules Figure 2 1 and provides a general discussion of each The RUSKA 77501 has two pneumatic control and two primary transducer modules Vacuum Supply Ps Test Port Supply Pressure Port Exhaust Port Primary Transducer Ps Module Photo Sensor SENSOR Pneumatics Qc Module Pt Test Port Supply Pressure Port Exhaust Port SUPPLY PNEUMATICS INNER LOOP SENSOR BACKPLANE BOARD DIGITAL CONTROL BOARD 1 SENSOR SENSOR BOARD DIGITAL CONTRO
74. ity to do so is not covered by the Rate of Climb Tolerance specification A 7 RUSKA 7750i Users Manual Table A 6 Specifications RUSKA 77501 Mode Differential Precision From 25 to 100 of FS 0 005 of Reading Below 25 FS 0 005 of 25 FS Stability Over 3 Months 0 0019 RDG 3 months Over 1 Year 0 0075 RDG year 5 to 60 in 80 1000 cm Total Uncertainty 32 inHg D 68 inHg D Aeronautical Units 50 0 1 knots 50 0 2 knots 100 0 05 knots 250 0 04 knots 290 0 02 knots 500 0 02 knots 1000 0 02 knots Total Uncertainty 32 inHg D 68 inHg D Engineering Units 0 5 0 0005 inHg 0 5 0 001 inHg 16 0 0013 inHg 16 0 0016 inHg 32 0 0026 inHg 32 0 0027 inHg 68 0 0055 inHg 1 Precision is defined as the combined effect of linearity repeatability and hysteresis throughout the operating temperature range Some manufacturers use the word Accuracy in place of Precision however the meaning is identical Requires vacuum pump to control O psig or the vent mode can be used to obtain O psig Zero drift typically improves with sensor age Total Uncertainty is defined as the two sigma combined uncertainty of linearity hysteresis repeatability thermal effects one year drift stability and the uncertainty in the Fluke primary standard which include the uncertainty from NIST Appendix B Summary of Error Messages Summary of Error Messages Negative error numbers are from the
75. le A 1 Uncertainty Analysis for a RUSKA 7750i 3 month and Yearly Calibration 90 Day Uncertainty 1 year Uncertainty 32 inHg Ps Sensor 32 inHg Ps Sensor 2 sigma 2 sigma Uncertainty Analysis RUSKA 7750i A 1 Performance Linearity Hysteresis Greater of 0 005 of RDG Greater of 0 005 of RDG Repeatability and Temperature or 0 0004 inHg or 0 0004 inHg A 2 Span Stability 0 0019 of RDG 90 days 0 0075 of RDG year A 3 Zero Stability re zero at 8 hours 0 0004 inHg 0 0004 inHg A 4 Calibration Standard Abs Mode 0 001 RDG amp 0 00039 inHg 0 001 RDG amp 0 00039 inHg RUSKA 2465 or 2468 DWG openen A 7 Two Sigma Expanded Uncertainty RSS 0 0055 RDG amp RSS 0 0091 RDG amp 0 0008 inHg 0 0008 inHg A 3 RUSKA 7750i Users Manual Table A 2 Uncertainty Analysis for a RUSKA 7750i 3 month and Yearly Calibration 90 Day Uncertainty 1 year Uncertainty 40 inHg Ps Sensor 40 inHg Ps Sensor 2 sigma 2 sigma Uncertainty Analysis RUSKA 7750i A 1 Performance Linearity Hysteresis Greater of 0 005 of RDG Greater of 0 005 of RDG Repeatability and Temperature or 0 0005 inHg or 0 0005 inHg A 2 Span Stability 0 0019 of RDG 90 days 0 0075 of RDG year A 3 Zero Stability re zero at 8 hours 0 0005 inHg 0 0005 inHg AA Calibration Standard Abs Mode 0 001 RDG amp 0 00039 inHg 0 001 RDG amp 0 00039 inHg RUSKA 2465 or 2468 DWG een 0 000 of RDG 0 000 of RDG A
76. mand DISPLAY ENABLE ON will restore the local display and keyboard operation Local operation may also be restored by turning the ADTS off and back on Remote Operation 5 Configuration Configuration The remote interface must be configured before it is connected The remote interface is configured using the local interface The parameters needed vary with the interface used IEEE 488 Address Protocol RS 232 Baud Rate Data Bits Parity Stop Bits To configure the remote interface 1 The remote interface is configured from the Setup Remote Menu From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 then Setup F2 and finally Remote F4 2 Usethe rotary knob to highlight the desired parameter Use the numeric keypad to enter the address use the rotary knob to change the other parameters The ENTER key must be pressed after entering the address 4 Repeat steps 2 and 3 to set all parameters needed Device Messages SCPI Command Format SCPI mnemonics have two forms long and short The short form is all in capital letters The long form is the entire mnemonic Commands may use either the short form or the entire long form No other forms are accepted SCPI ignores case uppercase and lowercase are equivalent A SCPI command is made by following the command tree as presented in the command summary Each level adds a mnemonic to the command separated by colons Mnemonics enclosed in s
77. manual Calibration report User specified instrument options If necessary report any shipping damage to the freight agency Remove all shipping and packing materials including the shipping plugs from all components If possible save the packing materials for future shipping needs Finally install the ADTS in a location that meets the requirements listed in Table 3 1 Note The ADTS should be handled in such a way as to minimize mechanical shocks or vibration during installation or use It should be mounted on a rigid bench or in a sturdy 19 wide rack cabinets 18 to 24 deep An optional Rack Mounting Kit is available Part Number 7250 903 Although the zeroing process will compensate for a slightly unlevel mounting the ADTS should be mounted to within 5 of level 3 1 RUSKA 7750i Users Manual Table 3 1 General Specifications and Parameters 5 9595 RH non condensing If there is any condensation when storing the ADTS it must be thoroughly dried before power is applied It is also recommended to connect the reference port to the test port and evacuating these simultaneously to remove any moisture from the sensor Cautions The following cautions should be heeded at all times to ensure safe operation of the ADTS A A Warning Never operate the ADTS with the cover removed The power supply has internal voltages near 400 volts For each channel never apply more than 120 of the ADTS s channel full
78. n key to go to the Ps ONLY CHANNEL screen 4 Press the Mode key to toggle between Ps ONLY CHANNEL and Qc ONLY CHANNEL screens Go to Ground Go to Ground F2 function is used to control the pressure in the system to the atmospheric pressure at ground level Once at ground level the ADTS physically vents the test port to atmosphere This allows the operator to return all of the equipment connected to the ADTS back to atmospheric pressure so they can be safely disconnected from the ADTS Leak Test Leak Test F3 function is used to perform a leak test on the system This is a timed leak test that allows the operator to enter a wait time and a run time The operator would control the system to the desired leak test set point Using the rotary knob the wait time and the run time can be entered When initiated once the wait time has expired the ADTS would display the current leak rate This value continuously updates until the run time expires and this displayed value stops updating to document the leak rate over the timed interval 4 3 RUSKA 7750i Users Manual Single Channel Display Screen 1 Pressing the Menu key from the Main Menu places the unit in a single channel display mode This mode is generally preferred when operating only a single channel of the ADTS 2 Press the Mode key to then toggle between the Ps ONLY CHANNEL and the Qc ONLY CHANNEL screens The ADTS displays the measured pressure in double sized numbers Below t
79. nclude code for the pressure controller The controller software version can be viewed by pressing the MENU TEST REMOTE SERIAL2 keys The controller software version is displayed next to Ctrl This code can be upgraded through the RS 232 port on most units Press the MENU TEST CONTROL key and check for Download Yes The digit in front of the R increases with revision levels and the last two digits will increment upwards as the revision level increases e g OR99 is older code than 1RO1 which is older than 1 R08 etc l 2 p ddp dee uum Connect a PC to the RS 232 port on the RUSKA 77501 using a null modem cable The zip file labeled RUSKA 7750iControl XR XX contains files UPDATE7 EXE and version IMG Unzip these files into a directory Set the RUSKA 77501 to 9600 baud 8 databits no parity 1 stopbit Run the program Update7 Follow the prompts to select the communications port and the image file Update 7 should display Complete Note When updating the controller code the RUSKA 77301 will display various error messages This is expected The front display will freeze on the RUSKA 7750i when the controller code is being downloaded It will operate properly once the download is complete Finally the main software only reads the software versions on power up So following the controller code upgrade pressing the MENU TEST REMOTE SERIAL2 keys will only show the new revision level of the controller code after power i
80. ng either the Control Ps or Control Qc function key places both channels of the ADTS into the Control Mode If it is desired to have only one channel in the control mode press either the Control Ps or Control Qc function key a second time and that channel will be switched back into the measure mode This will leave only one channel in the control mode ENTER must be pressed to confirm entry into Control mode Note An entry in the numeric scratchpad will also be taken as the new pressure set point From the single display screen press the Ps Control F2 or Qc Control depending on which channel is operating to place the selected channel in control mode ENTER must be pressed to confirm entry into Control mode Press MEASURE key found in the keypad to exit Control mode No confirmation is necessary This will place both channels in the measure mode Note In the dual display mode if both channels are in control mode pressing either F1 or F4 keys will place only the selected channel into measure mode The Vent F3 function is used to control pressure in the selected channel to atmosphere Once at atmospheric pressure the ADTS physically vents the test port to atmosphere RUSKA 7750i Users Manual Step Jog This feature is only available when operating in the single display mode To place the ADTS in the single display mode from the dual display screen press the MENU key In addition to entering the pressure set point through the k
81. nter call e Technical Support USA 1 800 99 FLUKE 1 800 993 5853 e Calibration Repair USA 1 888 99 FLUKE 1 888 993 5853 e Canada 1 800 36 FLUKE 1 800 363 5853 e Europe 31 402 675 200 e China 86 400 8 10 3435 e Japan 81 3 3434 0181 e Singapore 65 738 5655 e Anywhere in the world 1 425 446 5500 Or visit Fluke s website at www fluke com To register your product visit http register fluke com To view print or download the latest manual supplement visit http us fluke com usen support manuals Safety Information Safety Summary The following are general safety precautions that are not related to any specific procedures and do not appear elsewhere in this publication These are recommended precautions that personnel must understand and apply during equipment operation and maintenance to ensure safety and health and protection of property Keep Away From Live Circuits Operating personnel must at all times observe safety regulations Do not replace components or make adjustments inside the equipment with the voltage supply connected Under certain conditions dangerous potentials may exist when the power control 1s in the off position due to charges retained by capacitors To avoid injuries always remove power from discharge and ground a circuit before touching it 1 1 RUSKA 7750i Users Manual 1 2 Do Not Service or Adjust Alone Do not attempt internal service or adjustment unless another person c
82. o toggle between the Ps and the Qc channels 2 Turn the rotary knob until the label Display digits is highlighted Turn the rotary knob further until the desired number of digits from the default resolution is highlighted 1 0 1 and then press the ENTER key to select Key Click The ADTS can be configured to emit a clicking sound each time a key is pressed 1 The key click is set from the Menu Menu Setup User From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 Menu F6 then Setup F2 and then User F2 2 Turn the rotary knob to highlight Key click and then highlight either on or off 3 Press the ENTER key to select Menu Setup Units In addition to the standard units of measure provided by the ADTS two user defined units are available To create a user defined unit the user enters a name that 1s one to ten characters long and a conversion factor that is a multiple of kiloPascals kPa For example using the information from Table 2 1 the conversion factor for millitorr or one micron of mercury at 0 C is calculated as follows 1000mTorr 1 Torr 1mm Hg 0 0 1450377psi mTorr kPa x ImmHg0 0 0193377psi kPa Thus the conversion factor simplifies to mTorr kPa x 7500 6180 user 01450377 Ci 0009692 mbar 10 gme19 bmp Figure 4 12 Menu Menu Setup Units l Local Operation 4 Menu The pressure units are defined from
83. oduct is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price Fluke reserves the right to invoice Buyer for importation costs of repair replacement parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contamination alteration accident or abnormal condition of operation or handling including overvoltage failures caused by use outside the product s specified rating or normal wear and tear of mechanical components Fluke will provide an estimate of repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges F
84. oftware Upgrade Replacement Pall S eerren tirrin iTA R O Ei 7 Preparation for Storage and Shipment Preparation for Storage amp Shpmment ener Discomncctins Mo ADS eege Eeer Packing Kee rte stand dns Shipping bai Te Appendices A Summary of Specifications ooocccccccnnncnnnnnnnnnnnnnonononnnnnonononononnnnnnnnnonnnnnnnnnnss Ge B Summary ol Error EE Table List of Tables Title Page EE oie ee 13 RUSKA 7750i ADTS Options List ECH Conversi n Tee usarios iii idos ES Solenoid EE 2 4 General Specifications and Parameter nennen 3 2 Pl ctonics KE ET 6 2 RUSKA 77501 ADTS Replacement Parts ist 6 15 RUSKA 7750i Users Manual yi List of Figures Figure Title ek ADIS Block Ereegnes 2 2 RUSKA 77501 ADTS Pneumatics Model 2 3 RUSKA 77501 ADTS Pneumatics Schematic Diagram P ME to oe YA 2 5 Menmu Display Mie atada iamen 3 1 RUSKA 7750i Back Panel 3 3 4 1 RUSKA 7750i Front Panel 4 1 A A o swan saaneoaninan see ya ceseeoutncuassamuntavonnacnaderosasdve mss 4 2 4 3 Dual Channel Control e essai drei puso cons aite a a aS 4 3 4 4 Single Channel Display Main Men 4 4 e MES LUE 4 5 4 6 Single Channel Display Main Men 4 6 Ala FH Matt coge 4 8 428 Meno Menu SCD era 4 9 4 9 Menu Menu Setup Limits secos berto akt GEES 4 9 4 10 Airspeed IK MOS MAA 4 11 4 1 T Menu Menu Setup USE atacadas 4 12 4 12 Menu Menu Setup
85. on provided by the equipment may be impaired The AC plug switch and power cord shall remain readily accessible for the operation Symbols Used in this Manual In this manual a Warning identifies conditions and actions that pose a hazard to the user A Caution identifies conditions and actions that may damage the ADTS or the equipment under test Symbols used on the RUSKA 77501 Air Data Test Set ADTS and in this manual are explained in Table 1 1 General Information 1 General Information Table 1 1 Symbols Do not dispose of this product as unsorted municipal waste Go to Fluke s website for recycling information This equipment meets the requirements of all relevant European safety directives The equipment carries the CE mark General Information The RUSKA 77501 ADTS uses force balanced fused quartz Bourdon tube technology to provide the precise measurement of pressure During normal operation the ADTS performs in either Measure mode or Control mode In Control mode the ADTS simultaneously measures and controls pressure Control mode is commonly used in the calibration and testing of air data computers altimeters airspeed indicators rate of climb indicators pressure gauges transducers pressure switches and production pressure instruments In measure mode the ADTS measures pressure It can be used to monitor barometric pressures vacuum systems and differential pressure devices The RUSKA 77501 has
86. or the vacuum level to stabilize as read by the internal vacuum sensor Generally the stability should to be better than 5 mtorr per minute Verify that the primary sensor pressure and temperature are stable Press OK F6 when stable Do not disturb the instrument while zeroing is in process Wait for the zeroing procedure to finish Press PREVIOUS to return to the Main Menu Sensor Photocell Zeroing If the error message Mechanical Zeroing Needed is displayed the sensor photocell must be zeroed The following steps describe this process Press the MODE key to select the desired channel AA Warning The ADTS should only be opened by qualified electrical mechanical service technicians Lethal voltages are present and exposed in the power supply and display Note The Qc sensor MUST have zero differential pressure between the Test Pt port and Reference Ps port The Ps sensor requires a vacuum of 200 mtorr Remove the ADTS s top cover the Ps sensor 1s located on the right and the Qc is on the left when viewed from the front of the unit Locate and remove the plastic zeroing plug located in the side of the sensor oven assembly Enter the Zeroing screen by selecting MENU MENU CALIBRATE 6 9 RUSKA 7750i Users Manual 4 Select the Primary sensor by pressing the Sensor F6 key until the words Ps Primary or Qc Primary depending on the desired sensor is displayed above the calibration coefficients 5 Select
87. ors in the transfer standard This includes influences such as ambient temperature line pressure head pressure time response and controller effects It may include other influences that are very specific to one manufacturer s instrument It is recommended that the intended application is reviewed to assure that the environmental does not impact the instruments performance or that the impact from the environment is accounted for in the uncertainty analysis For instance if an instrument has a 0 001 FS per C temperature effect from a calibrated temperature of 20 C and the instrument is to be used in an environment where the temperature will vary from 15 C to 25 C then a 0 005 of full scale uncertainty should be included in the uncertainty analysis for ambient temperature effects Absolute Zeroing Reference Sensor A 2 The two sigma expanded uncertainty of the vacuum sensor is used to zero the absolute Ps sensor is estimated to be less than or equal to 10 mtorr 1 33 Pa per year Summary of Specifications A Uncertainty Analysis Combining the Uncertainty Components into an Expanded Uncertainty Statement Once all of the uncertainty components are identified they can be combined into an overall Expanded Uncertainty Statement for the instrument The vast majority of the measurement community has adopted a statistical approach to uncertainty analysis such as the International Organization for Standards ISO Guild to the Expression
88. procedure in place Please contact the Customer Service Center to obtain an RMA number prior to returning any equipment Have the following information available when contacting Fluke a the part number b the serial number the purchase order number 2 d the billing and ship to address and e the buyer s name and telephone number This information plus the RMA number must be attached to the unit when it 1s shipped to Fluke Calibration There will be a minimal charge for inspection and or evaluation of returned goods 2 Enclose the ADTS in plastic or any good water barrier material Antistatic material is recommended 3 Ifthe original shipping carton is not usable or available use a double walled corrugated carton with a 275 Ib rating The recommended carton size is 25 1 2 x 19 1 2 x 12 3 8 inches 4 Insert one foam cradle from the original shipment onto the floor of the box The original foam cradles are of the same type of construction and are completely interchangeable If the foam cradles are not available cover the bottom and sides with no less than 3 inches of N 95 foam strips Arrange the strips in the configuration illustrated in Figure 7 1 5 Before sealing the carton include the following a Statement of the problem or service needed Be specific Include the name and telephone number of a knowledgeable technician for consultation b The part number serial number return address and purchase order n
89. quare brackets are optional and may be omitted Some mnemonics are followed by an optional numeric suffix If omitted the suffix defaults to 1 Multiple commands may be placed in a single message separated by semicolons Each command starts at the same level of tree where the last command stopped unless the command starts with a colon The first command in a message and any commands starting with a colon start at the root of the command tree IEEE 488 2 commands may occur between SCPI commands without affecting the tree level Command parameters are separated from the command name by one or more spaces Multiple parameters are separated by commas SCPI accepts numeric parameters with optional sign decimal point and exponent OFF is equivalent to zero and ON 1s equivalent to one Floating point numbers are rounded to the nearest integer for commands accepting integer values only A message 1s terminated by a line feed hexadecimal 0A Carriage returns tabs and other control characters are ignored SCPI Response Format Most values can be queried by appending a question mark to a command and not specifying any parameters Commands ending with a question mark in the command summary cannot be set only queried Multiple values from a single command are separated by commas Responses from different commands in the same message are separated by semicolons The response message is terminated by a line feed hexadecimal 0A
90. r sizeof buffer RS ee o o o EE a o a e e EE EEEE PEEN PEEN e PEEN PEEN EEEE DERNE Sample Program 2 RUSKA 7750i GPIB IEEE 488 Zero Sequence EE Sample Program 2 7750 GPIB IEEE 488 L wi Zero Sequence O 5 12 include lt stdio h gt Fine ude lt stdlib h gt include lt string h gt include eonao h Hinclude decl h P int device GPIB Device descriptor char buffer 256 buffer for input output strings double pressure Pressure read from unit inc status Status register from unit int check errors void int zero void void write 7000 char s void request 7000 char s void main void chal p EE EE EE e a M ep e De eM e e Initialize GPIB Interface Soa eae eee ee MURS device ibdev 0 First GPIB Board 4 GPIB Address of 7750 NO SAD No secondary addressing Tis 1 Second Timeout O No automatic EOI for transmit REOS LF Terminate read on Line Feed if ibsta amp ERR cprintf GPIB Driver not installed n return if zero JJ ibonl device 0 return Res
91. r absolute Enter the actual value of the applied pressure generated by the standard and press ENTER Generate the second pressure Enter the actual value of the applied pressure generated by the standard and press ENTER The Vacuum sensor is now linearly compensated Once the calibration procedure is complete the user should verify several pressure readings against the pressure standard If there are variances beyond the stated precision then an error was probably made in generating one of the calibration pressures and the calibration procedure should be repeated Remove the vacuum standard from the instrument 10 Reinstall the cover onto the RUSKA 77501 Maintenance 6 Calibration Editing the Calibration Coefficients If the ADTS s memory is erased but the calibration coefficients are known the user can restore the coefficients to the ADTS by following the directions below 10 Zeroing A Caution Never randomly adjust the calibration coefficients Only qualified personnel with valid backup data should be allowed to edit the coefficients If the backup coefficients are questionable perform the calibration procedure in its entirety Verify that the ADTS is in Measure mode Chapter 4 Enter the Calibration screen by selecting MENU MENU CALIBRATE CALIBRATE When first entering the Calibration menu the top line of the display will indicate which sensor is being the viewed The sensors coefficients are then shown belo
92. r loop provides closed loop control based on feedback from the quartz Bourdon tube and an analog output setting which provides the desired set point for the inner loop Control Strategy Inner vs Outer loops The inner loop accepts a signal from the outer loop and uses this signal as the pressure set point The inner loop uses a high frequency response strain gauge sensor as its reference The frequency response of this transducer allows for high speed modulation of the solenoids This sensor is aligned to the high accuracy quartz sensor when the system is Auto tuned The outer loop is a lower frequency response analog digital loop The outer loop uses a calibrated forced balanced sensor This sensor is used to monitor the pressure of the system The results are used for the displayed pressure The outer loop is responsible for adjusting the signal sent to the inner loop to compensate for temperature and time drifts associated with the inner loop sensor Transducer Module Quartz Bourdon Tube Sensor The quartz Bourdon tube sensor is mounted in a machined aluminum housing The sensor consists of a helical quartz tube with a mirror affixed to one end as shown in Figure 2 4 A rigid beam is attached transverse to the axis of the helical tube Attached to both ends of this beam are electromagnetic coils Mounted beneath the coils are permanent magnets A lamp assembly directs light through a quartz window onto the mirror affixed to the heli
93. ration 4 Menu Menu Calibrate The Menu Calibrate command is used to perform the calibrations on all of the sensors utilized by the ADTS The RUSKA 77501 can be completely calibrated using the front panel interface It does not require any external computer or software in order to perform a successful calibration It also has the capability of being calibrated remotely through either the RS232 or IEEE 488 interface The RUSKA 77501 will guide the operator through a menu driven calibration procedure identifying the pressures that should be supplied by a standard Following the calibration procedure the RUSKA 77501 calculates and saves its own coefficients The calibration coefficients are date stamped so the user can easily identify the last time the instrument went through a full calibration when the coefficients were last edited or when the ADTS was re zeroed The calibration section in the ADTS can be password protected to prevent any unauthorized entry into the calibration section of the system Please refer to Chapter 6 Maintenance of the manual for more detailed information regarding the calibration of the ADTS The calibration menu is identical in both channels Press the Sensor function key to select the correct sensor from either channel Calibration Password The calibration password allows the user to protect access to ADTS calibration constants and the calibration procedure If the calibration password is set to any number other
94. re are no potentiometers to tune Note The uncertainty of the final calibration must include the uncertainty of the pressure standard being used Preparation 1 When calibrating the Qc channel verify that the Ps Test Port is open to atmosphere and that the calibration standard is connected to the Pt Test Port When calibrating the Ps channel verify that the calibration standard is connected to the Ps test port 2 Verify that the ADTS has been at stable environmental temperature and that the oven temperature MENU MENU DISPLAY TEMPERATURE has been stable for at least three hours Verify that the ADTS is in Measure mode Chapter 4 4 If desired change the ADTS s engineering units of measure Chapter 4 to match those of the calibration standard 6 3 RUSKA 7750i Users Manual 6 4 5 Set the gas head to 0 for both channels Select MENU MENU SETUP USER Press the MODE key to toggle between the Ps and the Qc channels and verify that they are both set to 0 To access the calibration screen select MENU MENU CALIBRATION CALIBRATION Ps Primary 32 000 7 16 000 40 0001 inHg Calibrate PEE Holz z K1F Ki K11 K 12 Last Zero IE 17 00 44 Last Calibrate 198001419 08 32 17 gme29 bmp Figure 6 2 Menu Menu Calibration Calibration 7 When first entering the Calibration menu the top left hand side of the display will indicate which sensor is being the viewed The sensors coefficients
95. re is reading within this ready tolerance value When running an internal program the ready indicator is shown when the measured pressure is within the tolerance stored in the program It is recommended that the Ready tolerance be set to a value greater than the Control Stability Specification defined in Appendix A Gas Head Pressure Correction The term head height refers to the vertical distance between the sensing element in the device under test and the ADTS s pressure reference plane Once the user inputs the head height and selects air or nitrogen the ADTS automatically corrects for head pressure 1 The Pressure Reference Line on the ADTS is defined as the bottom of the color display where the display and the front panel join This provides the reference plane against which the device under test DUT pressure is measured Determine the vertical distance between the ADTS Pressure Reference Line and the reference plane of the device under test 2 Press the Unit key found in the keypad and press in mm F1 to select either inches in or millimeters mm for the head height entry 3 The head height is set from the Menu Menu Setup User From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 press Menu F6 then Setup F2 and then User F2 4 Press Medium F3 to select either Air or Nitrogen The selected units will be highlighted 5 Press Position F4 to select if the position o
96. rformed to correct for system zero shift and does not require a full calibration The most important requirement for performing a valid zeroing procedure is to guarantee that there is not a pressure differential between the sensor s test port and case reference If during the zeroing procedure the message Mechanical Zeroing Needed appears the sensor photocell may need to be zeroed See Chapter 6 Sensor Photocell Zeroing for more information The zeroing screen presents several pieces of information 6 7 RUSKA 7750i Users Manual The screen will display the current status of the pressure sensor Stability and Temperature If any of the above are unstable then the system will delay until stability is achieved Pressing OK F6 will bypass this wait period Note Bypassing this wait period can have a negative effect on the zeroing procedure Qc Channel l Verify that the Ps and Qc sensors are close to atmospheric pressure 2 Enter the Calibration screen by selecting MENU MENU CALIBRATION 3 Select Zero F1 Do NOT press the Calibrate button Pressure 0 Out of Range Temperature 0 00 Stable Reference 0 000 Stable gme30 bmp Figure 6 3 Menu Menu Calibration 4 Do not disturb the instrument while zeroing is in process 5 Wait for the zeroing procedure to finish Performing Zero Adjust gme31 bmp Figure 6 4 Zeroing Screen 6 Press PREVIOUS to return to the Main Menu 6 8 Maintenance 6 Sensor
97. s Pressure Supply Port A single regulated pressure supply source of clean dry nitrogen or air should be supplied to the instrument Shop air should not be used Refer to Appendix A for supply port gas purity and pressure regulation requirements Tubing must be of at least 1 8 inch 3 mm inside diameter and of a sufficient wall thickness for the pressure Supply Vacuum Port A single vacuum pump is required to operate the ADTS Supply vacuum lines must have minimum restrictions Tubing should have a minimum I D of 1 4 inch It is highly recommended to have vacuum lines with outside dimensions of 1 2 to 3 4 inch Additionally the length of the vacuum hose should be minimized for optimum performance It is also very important to install an auto vent valve to the vacuum pump to vent the vacuum to atmosphere when the pump is turned off To zero the Ps channel a vacuum pump capable of producing a vacuum level of 200mTorr or less at the sensor reference port is required See Appendix A for vacuum pump requirements Ps amp Pt Test Ports The device s under test is connected to the test port The ADTS controller is designed to operate within its specification limits into load volumes from 5 in to 60 in 80 to 1000 cc Excessive leaks in the test volume will cause measurement errors in the device under test and may possibly affect control stability Tubing connected from the test port to the load volume should have an internal diameter
98. s cycled on the RUSKA 775301 Replacement Parts The following is a list of the common replacement parts used in the RUSKA 77501 ADTS Table 6 2 RUSKA 77501 ADTS Parts List Ps Test Valve 3961365 3915780 Maintenance 6 Replacement Parts Ps Vent Valve 3961365 3915780 Ps Apply Valve 3961352 3915780 Ps Release Valve 3961352 3915780 Ps Zero Valve 3961376 With Coil Pt Test Valve 3961365 Table 6 3 RUSKA 7750i ADTS Replacement Parts List 6 15 RUSKA 7750i Users Manual 6 16 Chapter 7 Preparation for Storage and Shipment Preparation for Storage amp Shipment A Caution The procedures given in this Chapter must be strictly adhered to in order to prevent damage to the instrument Failure to follow these procedures will likely result in damage to the ADTS during shipment This damage is not covered by the carrier s insurance Disconnecting the ADTS 1 Relieve all pneumatic pressure from the ADTS Turn the ADTS power switch to the off position Disconnect the power cable from the ADTS power receptacle Disconnect all pneumatic lines from the ADTS s back panel Si we M Dui Plug all ports Packing Instructions To prevent shipping and handling damage to the instrument adhere to and strictly follow the instructions below The governing discipline in ensuring a damage free shipment is to ensure that the possibility of handling shocks to the ADTS is minimized and or prevented during transit T
99. s to set up the controller when control valves are replaced or to perform maintenance on the controller The menu is primarily used for diagnostics and repair shown in Figure 4 19 and will be discussed further in Chapter 6 Maintenance Full Vales gme26 bmp Figure 4 19 Menu Menu Test Controller Menu Display The Menu Menu Display is used to conveniently monitor most of the sensor output parameters It is primarily used for troubleshooting This display screen shows all available sensor readings from both channels gme27 bmp Figure 4 20 Menu Menu Display 4 20 Local Operation Menu Display Temperature This displays the current temperature of each sensor and the oven control duty cycle Menu Display Vacuum This displays the current reading from the vacuum sensor that is used to zero the Ps sensor When railed to a high value it indicates 350 mtorr When the vacuum level present in the Ps sensor 1s less than 350 mtorr this sensor indicates the actual vacuum level Menu Display Blank This is used as a screen saver in the RUSKA 77501 Menu 4 4 21 RUSKA 7750i Users Manual 4 22 Chapter 5 Remote Operation Capabilities The ADTS can be operated remotely by a computer Two interfaces are supported IEEE 488 and RS 232 Both interfaces support SCPI Standard Commands for Programmable Instruments The IEEE 488 interface additionally supports emulation of a RUSKA 6610 ADT
100. sensor for calibration Ps Qc E nter Test menu Self Perform self test Remote Dis play remote status Shop 1 Dis play s olenoid valve s tatus Control Tune contol valve parameters Dis play Dis play transducer values To move to a lower menu press the function key with the correct label Temp Dis play quartz s ensor temperature Vacuum Dis play Ps sensor zeroing reference vacuum Blank Screen saver Figure 4 2 Menu Tree main menu press the PREVIOUS key gme09 eps To move towards the Local Operation 4 Local Operation Dual Channel Display Screen The ADTS displays a screen similar to the one shown below at power up This is the top of the menu tree The rotary knob may be used to highlight a set point to edit Then enter the new value using the keypad This will show up in the scratch pad on the lower portion of the screen Press the Enter key and the highlighted value will be updated gme10 bmp Figure 4 3 Dual Channel Control Screen Control Ps and Control Qc 1 Pressing the Control Ps or Control Qc function key places both channels of the ADTS into Control Mode If only one channel is required in control mode press either Control Ps or Control Qc function key and that channel will be switched back into the measure mode 2 Press Enter to confirm the change The display can be changed such that it only displays a single channel Press the Menu functio
101. sor The zeroing command will cycle the internal valves allowing the external vacuum pump to pull a hard vacuum on the quartz sensor The sensor should be pulled down to a vacuum of less than 100 mtorr in order to obtain a proper zero Note for the highest measurement performance it is recommended to zero the RUSKA 77501 at a vacuum level of 60 mtorr or less This is typically achievable within 30 minutes however in high humidity situations the drying time can extend to 45 minutes It is also important that the vacuum level be stable to at least 5 mtorr per minute Once the vacuum level 1s stable the user initiates the zeroing procedure Please refer to 4 17 RUSKA 7750i Users Manual Chapter 6 Maintenance of the manual for more detailed information regarding the zeroing procedure of the ADTS The ADTS can be zeroed at higher vacuum levels however the uncertainty of vacuum sensors tend to increase at higher vacuum levels therefore the uncertainty in the ADTS would also increase if zeroed at higher vacuum levels Menu Test The Menu Test section of the system is used to perform a number of the diagnostic and tuning functions that are available with the RUSKA 77501 The Sweep and Control test operate on the current selected channel The other screens are independent of the selected channel gme23 bmp Figure 4 16 Menu Menu Test Menu Test Self Test The ADTS can perform electrical and pneumatic self test to assist
102. te in Pt Mode The Qc sensor cannot be calibrated in Pt Absolute mode It must be calibrated in Qc Differential mode 800 Solenoid Over Temperature The control solenoids have over heated Wait until they have cooled before entering Control mode Summary of Error Messages Summary of Error Messages Table B 3 Summary of Error Messages continued Description and Corrective Action Error Reading Barometric RPT Pressure Sensor Control Sensor Out of Range Controller Communication Error Auto Tune Failed B RUSKA 7750i Users Manual B 4
103. than zero it is required before the user is allowed to calibrate the ADTS or manually change the calibration constants Note It is recommended that the access password be recorded and filed in a secure location 1 The calibration password is set from the Calibration Menu From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 Menu F6 then Calibrate F3 2 Press the Access F4 key If there is a password in the system other than 0 then the current valid password must be entered into the RUSKA 77501 before password modification will be allowed 3 Use the numeric keypad to enter the new calibration password Setting the calibration password to zero allows free access to ADTS calibration and constants Press ENTER 4 Press Yes F4 to acknowledge changing the calibration password Press No F5 to reject changing the calibration password Zeroing The ADTS should be zeroed once a day to maintain optimal performance The zero drift specification is defined in Appendix A under General Specifications Refer to Chapter 6 Zeroing for the zeroing procedure On the differential Qc sensor the zeroing procedure automatically ties both test and reference ports of the quartz sensor together and performs the zeroing routine On the permanent absolute Ps sensor a high capacity vacuum pump is required to zero the instrument A vacuum gauge sensor is installed internally to the Ps sensor very near to the quartz sen
104. the Menu Menu Setup Units From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 Menu F6 then Setup F2 then Units F3 Use the rotary knob to highlight the desired user defined unit and then select the Edit Name F1 function key The following sequence is used to change the name of the selected unit a Use the F4 or gt F5 key to highlight the desired character in the matrix b Use the rotary knob to change the character D Repeat steps a and b until the desired name is entered Press the Clear key to start over ge Press the Done F6 key when the name change is completed gme20 bmp Figure 4 13 Menu Menu Setup Units Edit Name Use the rotary knob to highlight the desired user defined unit that has just been renamed Use the numeric keypad to enter the conversion factor and press ENTER to accept Press PREVIOUS three times to return to the Main Menu The new unit definition may now be selected using the Units key Menu Setup Remote The Menu Setup Remote screen is where the remote communication interface is set up gme21 bmp Figure 4 14 Menu Menu Setup Remote 4 15 RUSKA 7750i Users Manual GPIB Address Sets the IEEE 488 interface address Protocol The Protocol defines which protocol should be used by the remote interface The options are Standard Communication for Programmable Instruments SCPI and RUSKA 6610 emulation Serial Inter
105. the heater for the quartz bourdon tube sensor or the oven temperature sensor itself is malfunctioning To observe the oven temperature select OK the select MENU DISP Check the transistor and sensor for malfunction requesting service if necessary 532 Vacuum Sensor Over Range 533 Case Pressure Over Range Select OK then reduce the pressure at the case reference port to 30 psia or lower 538 Automatic Vent 540 Mechanical Zeroing Needed The zero point of the quartz bourdon tube sensor is beyond the range of the compensation circuit The zero is adjusted by the software but should be manually adjusted for complete accuracy 542 Oven Control Failure The temperature controller is unable to keep the sensor at the proper temperature 545 Sensor Communication Error Unable to communicate with sensor 546 Sensor Calibration Lost The sensor has lost its calibration and must be recalibrated 550 Zero Aborted Zeroing has been aborted by local or remote Factory Data Lost Internal factory constants have been lost Contact Fluke for more information 601 Calibration Mode The calibrate button must be pressed before SCPI calibration commands can be executed 602 Model Changed Clear Memory The downloaded update does not match the installed software DO NOT CLEAR this error Download the correct software 603 Waiting for Calibration The previous calibration point has not completed 707 Pressure Too High 708 Cannot Calibra
106. ting the following information Step The pressure step in the calibration sequence Apply The pressure that the standard is to generate to the ADTS Tolerance The tolerance about the apply value that can be generated by the standard and still accepted by the ADTS Actual The actual pressure value that was generated by the standard when the point was accepted Adj FS Depicts the amount that the ADTS corrected its output to align to the standard This is used as a trouble shooting tool If one point has a significantly higher adjustment required than other points in the calibration this may indicate that there was an error in that specific calibration point The operator can re check this pressure point prior to completing and accepting the full calibration 2 The Step 1 actual value will be highlight This is your first pressure point in the calibration procedure 3 Using your calibration standard generate the pressure shown in the Apply column When the measured pressure stabilizes use the ADTS s numeric keypad to enter the actual pressure applied by the calibration standard and then press ENTER Do not enter the measured pressure reported by the ADTS If necessary use the CLEAR key to correct a mistake in the edit field If the actual pressure applied 1s within the indicated tolerance the unit will accept that point and the highlighted curser will automatically scroll down to the next calibration step Note If the actual press
107. tions of the TS 2 Long term Stability of TS 3 Uncertainty of the standard used to calibrate the TS 4 Environmental or installation influences that could cause errors in the TS Performance Specifications Performance Specifications are the short term measurement properties of the device These traditionally include linearity hysteresis and repeatability properties of the transfer standard There often is considerable confusion with the performance specification because different manufacturers use different terms to describe the performance characteristics of their instruments The two most common terms used are Accuracy and Precision In both cases as a minimum the manufacturers define these terms to be the combined effects of linearity hysteresis and repeatability Since the manufacturer defined the terms they used this should not be a problem However it is common that the user s definition of these terms differ from the manufacturer s and therefore cause considerable confusion For instance the user may believe that the term Accuracy includes all sources of uncertainty This would include items 1 through 4 listed above which would be an all encompassing specification The manufacturer may define Accuracy as the performance specification which consists only of item 1 above The result would be that the instrument would not be capable of meeting the user s application because it would not meet the user s definition of Accuracy
108. ts to the ADTS s memory the user is advised to separately record the calibration coefficients and store this backup in a safe place Step 5 l Ze Press PREVIOUS to return to the Main Menu Once the calibration procedure is complete the user should verify several pressure readings against the pressure standard If there are variances beyond the stated precision then an error was probably made in generating one of the calibration pressures and the calibration procedure should be repeated Vacuum Sensor Calibration Ps Zeroing Vacuum Sensor A span correction can be applied to the vacuum sensor This correction is done using the ADTS software and can be performed without removing the vacuum sensor from the ADTS chassis l Ze 9 Place the ADTS in Measure mode Remove all pressure sources from the system Connect a vacuum standard to the Ps Port on the rear of the unit Pump the instrument down for at least 12 hours If desired change the ADTS s units of measure see Chapter 4 to match those of the calibration standard To access the Calibration screen from the Main Menu select MENU MENU CALIBRATE SENSOR SENSOR CALIBRATE To begin the calibration process press CALIBRATE If the calibration access code is enabled enter it at the prompt The first Calibration screen will appear Use the pressure standard to generate the first of two pressure points The two pressure points are typically 100 and 200 mtor
109. two full scale pressure ranges and two pressure controllers integrated into one instrument Features The following features are available on all RUSKA 77501 ADTSs Fused Quartz Bourdon Tube Technology RUSKA s force balanced fused quartz Bourdon tube sensor makes use of the stability high elasticity low hysteresis and excellent fatigue strength of fused quartz This time proven technology eliminates the need for gear trains bearings shafts and other moving parts that can wear out or introduce hysteresis or dead band into the process NIST Traceability All ADTS s are calibrated using RUSKA s deadweight gauges that are directly traceable to the National Institute of Standards and Technology NIST NVLAP Accredited calibration reports are provided standard with the instrument Universal Power Supply The ADTS s universal power supply accepts AC voltages between 100 120 VAC and 220 240 VAC To reconfigure the ADTS for use in another country the user simply changes the power cord 1 3 RUSKA 7750i Users Manual 1 4 Measure While Control The ADTS simultaneously digitally displays the commanded pressure the actual pressure and the difference between the two A bar graph indicates how close the actual pressure is to the commanded pressure as well as how close the commanded pressure 1s to the ADTS s full scale pressure Friendly Display The ADTS s color active matrix TFT display combines a bright low glare rea
110. umber 6 Sealthe carton using gummed tape Address the carton to FLUKE CALIBRATION 10311 WESTPARK DRIVE HOUSTON TX 77042 USA 8 Labelthe carton with the following labels THIS SIDE UP HANDLE WITH CARE DO NOT DROP and FRAGILE If the original shipping carton is utilized for this shipment the above markings are preprinted on the carton 7 2 Preparation for Storage and Shipment Shipping Instructions gme38 bmp Figure 7 1 Packing the ADTS Shipping Instructions Fluke recommends using air freight for transportation Surface transportation subjects the shipment to more frequent handling and much more intense shock In most cases if surface transportation is the mode of transport employed handling damage 1s likely Again it is essential that the procedures mentioned in this Chapter be strictly adhered to in order to prevent any shipping and handling damage to the instrument 7 3 RUSKA 7750i Users Manual 7 4 Appendix A Summary of Specifications Uncertainty Analysis To perform an Uncertainty Analysis on a measurement device you must be able to identify all of the parameters that influence the measurement You must be able to quantify the magnitude of the potential error source and combine these into an overall uncertainty statement To determine the expanded uncertainty on any manufacturers pressure Transfer Standard TS you must identify the following four primary influences 1 Performance specifica
111. ument is fitted with the proper sized pressure lines to minimize flow restrictions see Chapter 3 Pneumatic Connections Verify that the control band is set as intended see Chapter 4 Auto Vent For active control when testing the controller the Control Band Off and Control Band On values should be set to zero Finally verify that the control is set to Normal to minimum overshoot see Chapter 4 Menu Menu Setup Control Band If the system continues to control improperly you can perform the Auto tune You will need to press the MODE key to select either the Ps or the Qc channel There are two options available to the operator Full This fully characterizes the control function of the RUSKA 77501 It automatically adjust the control valve biases and aligns the inner loop high control pressure sensor to the high accuracy quartz sensor This should be performed any time major components are replaced in the controller such as the control valves or the high speed inner loop control sensor Additionally if the controller is not functioning properly a full Auto tune can be performed to optimize the control Calibrate This automatically aligns the inner loop high control pressure sensor to the high accuracy quartz sensor If in the Normal control mode as opposed to the fast control mode the controller overshoots the commanded pressure valve this could be an indication that the inner loop control sensor needs to be realigned with the hig
112. ure the coefficients from the zeroing process the current pressure medium calibration coefficients and the conversion factors for the four user defined units of measure When the ADTS powers up its software is loaded into random access memory RAM also on the Microprocessor Board At the same time the values stored in EEPROM Board are restored to memory Another important component on the Microprocessor Board 1s the lithium battery The battery continuously updates the ADTS s date and time even when the unit is powered down This battery has a varying life If the instrument is left on 24 hours a day it will last 5 to 10 years If the instrument is stored it may only last one year The Microprocessor Board also supports the RS 232 serial interface that allows the user s computer to communicate with the ADTS Unless specified otherwise conversion factors are based on ANSI 268 1982 2 2 Theory of Operation 2 Pneumatics Module Table 2 1 Conversion Factors inches of mercury 60 C m weseensmom Wax mo Dus EELER Digital Control Board The Digital Control Board plugs directly into the Back plane Board This board reads a high speed silicon strain gauge pressure transducer PDCR connected to the pressure generation point A digital controller on the board drives two solenoids in the pneumatics section to form a high speed closed loop controller There are two digital control boards in the RUSKA 77501 ADTS IEEE
113. ure is outside of the tolerance for the requested mid point pressure Error 222 Data out of range will occur Acknowledge this error by selecting OK F6 then re enter the actual pressure repeating Step 2 number 1 if necessary step 3 1 Generate the next pressure calibration point requested by the ADTS Apply this pressure using calibration standard and follow the instructions in Step 2 number 3 entering the actual pressure applied 2 Repeat this procedure until all of the calibration steps are complete Review the Adj FS field to see if one point has a significantly higher adjustment required than other points in the calibration This may indicate that there was an error in that specific calibration point The operator can re check this pressure point prior to completing and accepting the full calibration To re enter a point use the rotary knob and move the highlighted curser to the actual pressure values in the step in question Generate the requested apply pressure using the standard and enter then new actual value when stabilized 6 5 RUSKA 7750i Users Manual 6 6 Storing the Coefficients step 4 l Calibration is complete To exit the calibration procedure without storing the calibration coefficients in memory press CANCEL To store the calibration coefficients in memory select the Done F1 key and the ADTS will calculate all of its new coefficients Note In additional to saving the calibration coefficien
114. urn TRUE else buffer i ch butter QUEUE SIZE 1 0 Buffer full return FALSE Tt Sample Program 4 QBASIC Example for RUSKA 7750i REM SINCLUDE C GPIB PC QBDECL BAS DIM READING AS STRING 30 CALL IBDEV 0 4 0 12 1 amp H40A R7010 CALL IBCLR R7010 CALL IBWRT R7010 MEAS chr amp H0A CALL IBRD R7010 READINGS PRINT READINGS CALL IBONL R7010 0 END Note EOM amp EOS are linefeed Ky r e 5 17 RUSKA 7750i Users Manual 5 18 Chapter 6 Maintenance Introduction Very little maintenance is required for the ADTS This section of the manual discusses suggested maintenance procedures Observing the Software Version Number Follow the steps below to observe the ADTS s software version number 1 Ifnecessary press PREVIOUS several times to return the display to the Main Dual Display Menu 2 Select MENU MENU SETUP SYSTEM The software version number will appear on the screen 3 Press PREVIOUS to return to the previous screen Preventive Maintenance Although the ADTS is designed to be nearly maintenance free occasional preventive maintenance is required to keep the ADTS s performance optimal Initiating the ADTS s Self Test To test the ADTS s hardware and software follow the steps below 1 Ifnecessary press PREVIOUS several times to return the display to the Main Dual Display Menu then press the MODE key to select the channel main menu
115. value UNIT VAC Ps set maximum vacuum UNIT VAC Ps enter zero mode Ps status for cal press temp ref Ps start zero calibration abort zero calibration Set minimum zero wait time perform Qc calibration point number of Qc calibration constants label value C0 0 123 Set calibration constant Qc nominal calibration point Qc number of calibration points Qc last calibration date RUSKA 7750i Users Manual TIME ZERO DATE TIME INITiate INITiate RUN STOP PRESsure4 Ps Control Sensor VALue n number DATA POINts VALue lt n gt VALue n number CALibration VALue lt n gt POINts ZERO number PRESsurel4 Qc Control Sensor Same as PRESsure4 VACuum Same as PRESsure4 VACuum11 Same as PRESsure4 TEMPerature2 Same as PRESsure4 TEMPeraturel2 Same as PRESsure4 above above above above above DISPlay ENABle ON OFF 1 0 TEXT zt xts PRESsure BGRaph lt number gt PRESsurell BGRaph lt number gt OUTPut PRESsure MODE MEASure CONTrol VENT STATe ON OFF 1 0 PRESsure11 MODE MEASure CONTrol VENT STATe ON OFF 1 0 SENSe PRESSure RANGE UPPer LOWer REFerence HEIGht number MEDium N2 AIR RESolution number AUTO ONCE PRESSurell RANGE UPPer LOWer REFerence HEIGht number MEDium N2 AIR RESolution number AUTO ONCE TRATe RESet STARt TIME lt minutes
116. ver 2 Remove the processor card by removing the screw and the bracket that locks the display cable in place and gently rock the card upward 3 Holding the processor card remove the battery the round silver object by carefully pulling on the battery 4 Plug in a new battery part number 4 725 Reinstall the processor card the bracket that locks the display cable in place and the screw Replace the instrument cover 6 The time and date may have to be re entered See Chapter 4 Menu Setup System Calibration To keep the ADTS operating within its specified precision the calibration procedure described below should be performed once every year If a higher level of overall performance is desired the user can calibrate more frequently Note The calibration procedure automatically generates coefficients that are stored in memory on the ADTS If these constants are lost for any reason the calibration procedure must be performed regardless of the last calibration date If the calibration coefficients have been recorded they may be restored to the ADTS at any time by editing the coefficients Chapter 6 Editing the Calibration Coefficients Calibration Instructions To calibrate the ADTS the user connects a calibration standard such as the RUSKA Model 2465 or 2468 Gas Piston Gauge to the ADTS s test port then follow the multi step calibration procedure on the ADTS s display No disassembly is required and the
117. w the sensor label The first sensor that is shown is the Ps sensor Press the Sensor F6 function key to cycle through the various sensors that exist in the system To edit the calibration coefficients press the EDIT button If the calibration access code is enabled enter it at the prompt The first calibration screen will appear Note To exit the calibration procedure before the calibration coefficients have been changed press CANCEL any time during the procedure Canceling restores all previous calibration values Use the rotary knob to highlight the coefficient to be edited The terms are coefficients of a linear regression analysis Use the numeric keypad and the ENTER key to enter a new value To correct a mistake in the edit field use the CLEAR key Repeat steps 4 and 5 until all coefficients are correct Note In addition to saving the calibration coefficients to the ADTS s memory separately record the calibration coefficients and store this backup ina safe place To exit the editing procedure without storing the calibration coefficients in memory press CANCEL To store the calibration coefficients in memory select DONE F6 Press PREVIOUS to return to the Main Menu Once the calibration coefficients are input the user should record several pressure readings If there are any variances beyond the stated precision at these points then the calibration procedure should be performed The zeroing procedure is pe
118. y follows the form of a second order polynomial or I 2 aP bP c where again P 1s pressure and a b and c are coefficients generated during the calibration procedure as discussed below When the user performs a three point calibration the ADTS s software creates the three coefficients based on the user s zero mid point and full scale adjustments From then on the nonlinear term given above is subtracted from the total pressure current curve to achieve the desired linear pressure current relationship On the RUSKA 77501 multiple quartz sensor ranges are used in order to provide the percent of reading specification In these instruments a total of three points per range with one point shared between two ranges 1s required Therefore a 5 point calibration is performed to fully characterize the quartz sensors Software The ADTS is a digital software based instrument The controlling software uses a PID algorithm and allows for user definable units and onboard programming The software control loop is a digital outer loop with a high speed inner loop Software Safety Controls Preventing Operator Errors The operator is required to verify a change to Control mode or Vent mode by pressing the Enter key Additionally the control set point is set to zero on power up or when any of the limit errors occur Pneumatic Errors The ADTS continually monitors the pressure for low high and slew rate of change limits When these limits are

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