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DIGITAL PRESSURE CONTROLLER MODEL 7050 MODEL 7050i
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1. 7 3 APPENDIX SUMMARY SPECIFICATIONS AT ACCURACY C Rr 1 92 5 A Ree deal tien Desa coq A 5 APPENDIX B SUMMARY OF ERROR MESSAGES B 1 INTRODUCTION FIGURE 2 1 FIGURE 2 2A FIGURE 2 2B FIGURE 2 2C FIGURE 2 3 FIGURE 2 4 FIGURE 2 5 FIGURE 2 6 FIGURE 3 1 FIGURE 4 1 FIGURE 4 2 FIGURE 6 4 FIGURE 6 5 FIGURE 7 1 TABLE 1 1 TABLE 2 1 TABLE 2 2 TABLE 3 1 TABLE 6 1 TABLE 6 2 TABLE A 1 LIST OF FIGURES PPEBEOCK DIACORANG claridad equo toas on nea ap oaa 2 1 MODEL 7050 PPI GAUGE PNEUMATICS DIAGRAM 2 4 MODEL 7050 PPI ABSOLUTE PNEUMATICS DIAGRAM 2 5 MODEL 7050 PPI ABSOLUTE PNEUMATICS 2 5 PRESSURE CONTROL PRECISION MODE ui 2 9 PRESSURE CONTROL FAST MODE pid 2 9 SHAFT MAGNET SECTION asar 2 7 PHOTOCELL LIGHT SRO T eA 2 7 MODEL 7050 BACK PANEL 46 ntitta Ini IEEE iniia i E 3 3 MODEL 7050 FRONT PANEL oe tent 4 MENU TREES nee reb Sh ette idc eie ats 4 2 VACUUM CALIBRATION tl 6 7 PHOTOCELL LOCATION a A 6 4 PACKAGING THE estas aesti EEE lia saos 7 3 LIST OF
2. 4 7 431222 Altriospliere cita 4 8 4 3 1 2 3 AA Sea 4 8 4 3 1 2 4 Changing the Number of Decimals 4 8 4 31 29 Key oerte perte er ette bte qi etd bees 4 8 4 3 1 3 Menu Setup DITS ioco ooa t 4 9 4 3 1 4 Menu Setup 4 2 4 10 453 1 41 PIB AGGIES dad 4 10 423 1422 Protocol nerit e eee 4 10 4 3 1 4 3 Serial Interface SU ia tenetis 4 10 4 3 1 5 Menu Setup System e See ges 4 10 4 3 ol Dale Miner oed ceia UN DIRE 4 11 An Sy 2 ade Eid 4 11 253852 MENO GAWMIB RATE 525 aucem 4 11 4 3 2 1 Calibration Passwerd iii 4 12 si ieu irte s irat ne BE RT UMEN 4 12 2 3 PEIN CHE SI eti dee rad Rat nete 4 13 4 3 4 1 Menu Test Self tete ore 4 13 4 3 4 2 Menu Test Remote 4 13 4 3 4 3 Menu Test Shop Lala 4 14 MENUT DISPLAY obtenta edat N 4 14 4 3 4 1 Menu Display Blank tue Feet ann 4 14 SECTION 5 0 REMOTE OPERATION S41 CAPABILITIES ci ERE a RO 5 viii INTRODUCTION 5 2 5 4 5 9 5 7 5 8 Dols E d di 5 1 SECTION 6 0 MAINTENANCE 6 1 6 2
3. i 1 SENSOR SENSOR i BOARD Section T 2 6 1 Section i 2 6 2 1 POWER BACKPLANE SUPPLY BOARD Section Section 2 3 1 22 AC FRONT IEEE MICROPROCESSOR POWER PANEL CARD BOARD Section Section Section Section 2 3 2 22 2 3 5 2 3 4 Electronic Module IEEE 488 FIGURE 2 1 PPI BLOCK DIAGRAM 2 2 POWER SUPPLY The PPI s universal power supply accepts AC voltages from 90 to 260 volts at 47 63 Hz and DC voltages from 100 to 370 volts This quad output supply produces 5 VDC 12 VDC and 24 VDC which are distributed to the Control and Backplane Boards 2 1 THEORY OF OPERATION 2 3 ELECTRONICS MODULE 2 3 1 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 2 3 2 MICROPROCESSOR BOARD All of the PPI 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 PPI as well as the conversion factors that the PPI uses to translate the internal pressure unit of measure of kPa into the units select
4. 1 Remove the PPl s top cover 2 Locate and remove the plastic zeroing plug located in the side of the sensor oven assembly 3 Enter the Zeroing screen by selecting MENU CALIBRATE 4 Select the Primary sensor by pressing the Sensor F6 key until the words Primary is displayed above the calibration coefficients 5 Select Zero F1 Do NOT press the Calibrate button 6 Select the Mechanical Zero F1 key 6 12 MAINTENANCE Pressure 0 Out of Range Temperature 0 00 Stable Reference 0 000 Stable 7 Referring to Figure 6 5 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 RIC 7250 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 Adjusting the photocell will cause the yellow bar to reduce in width You want to adjust the photocell until the yellow line is as thin as possible over the green bar Tighten the Allen screw Often when the Allen screw is tightened the zero will move Review the wid
5. 1 and then press the ENTER key to select 4 3 1 2 5 Key Click The PPI can be configured to emit a clicking sound each time a key is pressed 1 The key click is set from the Setup User Menu From the Main Menu press PREVIOUS until the Main Menu appears press 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 4 8 LOCAL OPERATION 4 3 1 3 Menu Setup Units In addition to the standard units of measure provided by the PPI four user defined units are available To create a user defined unit the user enters a name that is 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 O C is calculated as follows mTorr kPa x 1000 mTorr x 1 Torr x 1 mmHg O0 C x 0 1450377 psi 1 Torr 1l mmHg0 C 0 0193377 psi 1 kPa thus the conversion factor simplifies to mTorr kPa x 7500 6180 Edit Name kPa 7500 61800 0 0 0098692 10 MENU SETUP UNITS MENU 1 The pressure units are defined from the Units Define Menu From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 then Setup F2 then Units F3 2 Use the rotary knob to highlight the desired user defined unit and then select the Edit Name F1 function
6. 1 Out of Range 0 Stable gt 0 Time until stable Start Zero Calibration Last zero date Last zero time Perform calibration point Number of calibration constants returns cal constant label value Set calibration constant Number of calibration points Nominal calibration point Zero sensor to value Gas Temperature High Sensor Temperature Low Sensor Temperature return if calibration edit enabled Request calibration edit Turns Front Panel Display On Off Displays Message on Front Panel BGRaph lt number gt Sets Bar Graph Maximum SENSE PRESSure RESolution lt number gt AUTO lt boolean gt ONCE MODE MODE ABSolute GAUGe RANGE UPPer LOWer HEIGht number 5 5 Set Pressure Display Resolution Return to Default Resolution Returns ABSOLUTE or GAUGE Turns On or Off Simulated Absolute Returns PPI Full Scale Value in Units Returns Lowest Calibrated Value Set Gas Head Height REMOTE OPERATION MEDium N2 AIR STATus OPERation EVENT CONDition ENABle lt number gt QUEStionable EVENT CONDition lt number gt PRESet SYSTem DATE lt year gt lt month gt lt day gt KLOCK 1 0 TIME lt hour gt lt minute gt lt second gt VERSion LANGuage 6000 SCPI 500 PRESet TEST ELECtronic 5 UNIT DEFine lt n gt lt name gt lt number gt LENGth MMIIN PRESsure lt
7. Storage Temperature Humidity Dimensions Weight Standard Pressure Units Pneumatic Ports Relief Valves Minimum O to 5 0 to 700 mbar Maximum O to 3000 psi 0 to 200 bar 6 4 inch TFT Active Matrix Color User selectable up to 1 1 000 000 90 260 VAC 47 63 Hz 50 400 Hz for i models 150 W 18 36 20 70 5 95 relative humidity non condensing 7 Hx16 5 Wx 19 D 17 8 cm x 41 9 cm x 48 3 cm 7250i 16 Ib 7 25 kg inHg at 0 C and 60 F kPa bar psi inH O at 4 C 20 and 25 C kg cm mmHg at 0 C cmHg at 0 C and cmH O at 4 C 1 inch NPT female Test Port 12096 of Maximum Scaled Quartz Sensor Range Reference 10 Psig where applicable A 5 APPENDIX A PERFORMANCE TABLE A 1 PERFORMANCE SPECIFICATIONS 7050 70501 7050LP Precision 0 00396 FS From 2596 to 10096 FS 0 00596 RDG 0 005 of each Below 25 FS 0 005 of 25 FS Range Stability 0 0019 RDG 3 months or 0 0075 RDG year Zero Drift 0 004 FS 24hrs 0 002 FS 24hrs 0 004 FS 24hrs Options Neg Gauge 0 003 of max Greater of 0 005 of 25 FS or 520750 a mar Ta Predsionil postive FS 0 0005 psi 3 5 Pa Optional 0 005 of each range Barometric 0 002 psi year 0 002 psi year N A Reference 14 Pa year 14 Pa year Vacuum 0 0002 psi year 0 0002 psi year N A Reference 1 33 Pa year 1 33 Pa year Precision is defined as the combined effect of linearity
8. F6 key until the words Atmospheric Sensor is displayed above the calibration coefficients 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 You will use the calibration standard to apply the various pressures that will be requested by the 7050 The screen will display a table noting the following information a Step the pressure step in the calibration sequence b Apply The pressure that the standard is to generate to the PPI Actual The actual pressure value that was generated by the standard when the point was accepted The Actual value will be highlighted This is your first pressure point in the calibration procedure This calibration requires the generation of two pressures within the range of 700 to 1100 mbar absolute The selected pressures should be spaced as far apart as possible within the allowable range Generate the first pressure 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 RPT 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 gen
9. 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 2 10 THEORY OF OPERATION SECTION 3 0 INSTALLATION 3 1 INTRODUCTION This section of the manual discusses initial installation for the Model 7050 PPI Installing the PPI involves connecting the supply and test pressure tubing powering up the unit and configuring the system through the front panel 3 2 UNPACKING THE PPI Carefully unpack all components checking for obvious signs of damage The shipment contains the following items Model 7050 or 7050 power cord user s manual Be ee Se calibration report 5 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 PPI in a location that meets the requirements listed in Table 3 1 N
10. 0000 kPa 0 0000 58 4233 INTRODUCTION 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 is 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 DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person capable 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 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 bee
11. Instrument Corporation publishes are at the 2 sigma level which would be at a 9596 confidence level Some manvfacturers 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 00596 FS and that the uncertainty is expressed at the 1 sigma level then A 2 APPENDIX A it would be doubled to express it at the 2 sigma level i e it would be an 0 0196 FS device at a 2 sigma or 9596 confidence level The following two tables are uncertainty analysis examples for a 7250i based on a three month and a yearly calibration Uncertainty Analysis 3 Month Calibration Interval Uncertainty Ruska Model 7050i from 25 to 100 of Range 2 sigma A Performance Linearity Hysteresis Repeatability 0 00596 of Reading and Temperature B Stability 3 months 0 001996 of Reading per 90 days C Calibration Standard Ruska Model 2465 DWG 0 001096 of Reading Bement Temperature Included in A above 0 00096 of Reading 2 sigma Expanded Uncertainty RSS 0 005596 of Reading per 90 days Uncertainty Analysis One Year Calibration Interval Uncertainty Ruska Model 7050i from 25 to 100 of Range 2 sigma A Performance Linearity Hysteresis Repeatability 0 00596 of Reading and Temperature B Stability 1 year 0 007596 of Reading year C Calibration Stan
12. NOTE The calibration procedure automatically generates coefficients that are stored in memory on the PPl s 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 PPI at any time by editing the coefficients Section 6 4 3 6 4 1 CALIBRATION INSTRUCTIONS To calibrate the PPI the user connects a calibration standard such as the Ruska Instrument Model 2465 or 2470 for high pressure ranges Gas Piston Gauge to the PPI s test port then follows the multi step calibration procedure on the PPl s display standard PPI requires a positive pressure calibration A vacuum negative gauge option is available and requires special calibration per Section 6 4 2 disassembly is required and there are no potentiometers to tune NOTE The uncertainty of the final calibration must include the uncertainty of the pressure standard being used 6 4 1 1 Preparation 1 Verify that the PPI s Reference Port is open to atmosphere for gauge calibrations and that the calibration standard is connected to the Test Port 6 3 MAINTENANCE 2 Verify that the PPI has been at stable environmental temperature and that the oven temperature MENU DISPLAY has been stable for at least three hours 3 Verify that the PPI is in Measure mode Section 4 0 4 If desired change the PPl s units o
13. STD 859A User kPa x user defined User2 kPa x user defined user defined Pascals kPa x 1000 0 2 3 3 IEEE 488 INTERFACE The PPI s IEEE 488 GPIB interface card which plugs directly into the Back plane Board provides the PPI with an IEEE 488 interface This interface allows the user to automate the measurement and control processes 2 3 4 FRONT PANEL The Front Panel contains the active matrix TFT color display rotary knob and rubberized keys used to operate the PPI 2 4 PNEUMATICS MODULE The 5 Pneumatics Module varies depending on whether the PPI is a Gauge mode or Absolute mode instrument Gauge mode 5 reference their measurements to 2 3 THEORY OF OPERATION atmospheric pressure whereas Absolute mode measurements are made with respect to sealed vacuum A Simulated Absolute mode PPI has a barometric sensor in addition to a gauge Bourdon tube sensor The PPI adds the barometric reading to the Bourdon tube reading to obtain a Simulated Absolute value t can operate as a Gauge mode instrument if the user selects to not add the reference pressure The 7050 can also be supplied with an optional vacuum reference sensor n this configuration the 7050 can operate in the absolute mode by connecting a high capacity vacuum pump to the reference pump of the 7050 and evacuating the reference Therefore both the barometric and the vacuum reference option allow the 7050 to operate in the absolute
14. TABLES OPTIONS LIST FOR THE MODEL 7090 eiii 1 3 CONVERSION FACTORS c Patto 2 3 SOLENOID VALVE STATES zu cadet eti e Re Cei e i ea oe 2 6 GENERAL SPECIFICATIONS GENERAL 5 3 ELECTRONICS SELF TEST vascas et pae pi 6 2 PNEUMATICS SELF TEST nal a kv da ero e sth eno taa 6 2 PERFORMANCE Fee tte A 6 INTRODUCTION SECTION 1 0 GENERAL INFORMATION 1 1 INTRODUCTION This manual contains operation and routine and preventive maintenance instructions for the Model 7050 Precision Pressure Indicator PPI manufactured by Ruska Instrument Corporation Houston Texas This section of the manual provides general information about the PPI and presents its features and options 1 2 GENERAL INFORMATION The Ruska Model 7050 PPI uses force balanced fused quartz Bourdon tube technology to provide the precise measurement of pressure In Measure mode the PPI measures pressure Typically Measure mode applications are found in research laboratories wind tunnel testing power plant testing and bubbler tank volume accountancy systems It is also used to monitor barometric pressures vacuum systems and differential pressure devices 1 3 FEATURES The following features are available on all Model 7050 PPI s Fused Quartz Bourdon Tube Technology 5 2500 psi full
15. VALue ZERO VALUE lt number gt For example CALC LIM UPP will return the current Returns Current Pressure Reading Returns Oven Temperature Returns Oven 2 Temperature 7250xi only Return Case Pressure Return Barometric Reference Pressure Returns Pressure Slew Rate units sec Get Set Low Pressure Limit Get Set Slew Rate Limit Get Set High Pressure Limit Get Set Tare Value Set Tare state using current pressure Perform calibration point Number of calibration constants returns cal constant label value Set calibration constant Number of calibration points Nominal calibration point Last calibration date Last calibration time Performs Zero Calibration Sets Vacuum Value 5 4 REMOTE OPERATION INITiate INITiate RUN DATE TIME PRESsure2 Case reference sensor VALue lt n gt number DATA POINts VALue lt n gt VALue lt n gt lt number gt CALibration POINts VALue ZERO lt number gt PRESsure3 Reference sensor Same as PRESsure2 above PRESsure4 PDCR sensor Same as PRESsure2 above VACuum Same as PRESsure2 above TEMPerature Same as PRESsure2 above TEMPerature2 Same as PRESsure2 above TEMPerature3 Same as PRESsure2 above MODE MODE access code DISP ENABle ON OFF 1 0 TEXT lt string gt Enter Zero Calibration Mode Status for Cal Pressure Temp Reference Cal 0 Not Zeroing 1 Local Zero 2 Remote Zero Pressure Temperature Reference
16. 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 square 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 is equivalent to one Floating point numbers are rounded to the nearest integer for commands accepting integer values only A message is terminated by a line feed hexadecimal OA Carriage returns tabs and other control characters are ignored 5 4 22 SCPI RESPONSE FORMAT Most values can be queried by appending a question mark 2 to a command and not specifying any parameters Commands ending with a question mark in the command summary cannot be s
17. cord supplied with the PPI into the power connector on the PPl s back panel CAUTION Grounding for the PPI is provided through the power cord Next plug the power cord into a receptacle rated for any AC voltage between 90 and 260 volts If a different power cord is necessary for your receptacle consult Table 1 1 for available power cords Finally turn on the PPI 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 4 1 OBSERVING THE PPI S FULL SCALE RATING To observe the PPI s full scale rating 1 Press PREVIOUS until the main menu appears 2 Select MENU CALIBRATE The PPI s full scale pressure rating FS will appear on the screen in the currently selected units of measure 3 To return to the main menu press PREVIOUS 3 5 PNEUMATIC CONNECTIONS Pneumatic connection to the PPI is straightforward The following sections discuss each port All ports are 4 inch NPT pipe fittings See Figure 3 1 Remove all plastic shipping plugs from the back panel pneumatic ports 3 5 1 TEST PORT The device s under test is connected to the test port Excessive leaks in the test volume will cause measurement errors in the device under test Tubing connected from the test port to the load volume should have an internal diameter greater than 1 8 inches 3 mm Tubing should be shorter than 15 feet 5 meters when minimum diameter tubing is used 3
18. drifted in a sinusoidal fashion This would suggest that the sensor 1 APPENDIX A 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 Uncertainty of the Standard 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 that could cause errors in the transfer standard This includes influences such as ambient temper
19. key 3 The following sequence is used to change the name of the selected unit MENU SETUP UNITS EDIT NAME MENU 4 9 LOCAL OPERATION 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 c Repeat steps a and b until the desired name is entered Press the Clear key to start over d Press the Done F6 key when the name change is completed 4 Use the rotary knob to highlight the desired user defined unit that has just been renamed 5 Use the numeric keypad to enter the conversion factor and press ENTER to accept 6 Press PREVIOUS three times to return to the Main Menu The new unit definition may now be selected using the units key 4 3 1 4 Menu Setup Remote The Menu Setup Remote screen is where the remote communication interface is set up 4 Protocol 6000 510 Baudrate 1200 2400 19200 Data Bits 7 Parity 7106 6 Stop Bits 1p Menu Setup Remote Menu 4 3 1 4 1 GPIB Address Sets the IEEE 488 interface address 4 3 1 4 2 Protocol The Protocol defines which protocol should be used by the remote interface The options are Standard Communication for Programmable Instruments SCPI which is the standard interface 6000 to emulate the Ruska Series 6000 pressure controller and 510 to emulate the Druck model 510 pressure controller When using the SCPI interface the model 7050 will emulate the Ruska 70
20. off position Disconnect the power cable from the PPI power receptacle Disconnect all pneumatic lines from the PPI s back panel SD Een eo Plug all ports 7 2 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 PPI is minimized and or prevented during transit Ruska accomplishes this task by cradling the PPI within two foam cradles that are encapsulated within a double walled corrugated box The PPI 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 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 is to be used cut it into strips so that it will not present a large rigid surface to the PPI Ruska has found that corrugated cardboard boxes provide the best packaging exterior The box must have an impact rating of 275 Ib and be of double walled construction This type of box will sustain most types of damages 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 th
21. 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 As pressure is 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 Section 2 5 2 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 is 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 Absolute Models the process is similar except that the Bourdon tube is permanently evacuated to less than 0 1 mtorr and sealed at the factory and the test pressure is applied to the sensor case With this configuration all test pressures are measured with respect to vacuum 2 6 THEORY OF OPERATION FIGURE 2 5 SHAFT MAGNET SECTION rie FIGURE 2 6 PHOTOCELL LIGHT SPOT 2 5 2 SENSOR BOARD A temperature sensor and the quartz Bourdon tube pressure sensor are monitored by the Sensor Board The Sens
22. 10 and 7215 series controllers 4 3 1 4 3 Serial Interface Set Up The operator can set up the Baud Rate Data Bits Parity and Stop Bits for the Serial Interface 4 3 1 5 Menu Setup System The System Menu identifies the Software release version that is being operated in the PPI It also stores and allows the operator to edit the Date and Time 4 10 LOCAL OPERATION nt nt Ruska Instrument Model 7250x Software Version 2002 09 06 10 49 32 2002 09 11 Time 15 56 56 MENU SETUP SYSTEM MENU 4 3 1 5 1 Date Time The PPI 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 Setup System Menu From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 then Setup F2 and then System F5 2 To set the 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 4 3 1 5 2 Reset The Reset F1 command is used to re boot the PPI 1 To reset the system from the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 then Setup
23. 2 INSTALLATION 3 5 2 REFERENCE PORT The reference port is open to atmosphere for gauge measurements or it can be connected to the Reference Port of the Device Under Test For true absolute only systems or systems with the vacuum reference option a vacuum pump capable of producing a vacuum level of 200 mTorr or less at the sensor reference port is required used to zero the sensor POWER 85 265 VAC 50 60 HZ Ce SUPPLY EXHAUST TEST NOTICE FAN IS NORMALLY OFF SEE USER S MANUAL TO TURN ON FIGURE 3 1 MODEL 7050 BACK PANEL 3 3 INSTALLATION THIS PAGE INTENTIONALLY LEFT BLANK 3 4 INSTALLATION SECTION 4 0 LOCAL OPERATION This section of the manual describes operation of the PPI using the front panel The local interface front panel consists of a color TFT display a rotary knob and a set of keys The display shows the system status and menu options The keys are grouped according to function JC 5 YX 000 OO00 FIGURE 4 1 MODEL 7050 FRONT PANEL Numeric Keypad This includes the number keys the decimal point and the change sign key The UNITS key changes between units of measure MODE changes between modes of operation such as gauge and absolute MEASURE is used to place the unit into measure mode CLEAR key will clear the numeric entry field The ENTER ke
24. 6 3 6 4 6 5 6 6 5 1327 E A dubie Re kale RT O AEE E EE 5 1 REMOTE LOCAL OPERATION ies oai o ERR osas 5 2 CONAGURATON aii co 5 2 DEVICE MESSAGES ae ion 5 3 5 4 1 5 3 5 4 2 SCPI RESPONSE FORMAT vestida 5 3 5 4 3 ANSI IEEE 488 2 1987 COMMAND SUMMARY 5 4 5 4 4 SCPI COMMAND SUMMARY Caida 5 4 5 4 5 EXAMPLE ON Eder 5 6 5 4767 SCPI STATUS REGISTERS lia 5 7 6005 INTERFACE PANEL EMULATIO I idu pt d ierant vd 5 8 SERIAL OPERATION rata 5 9 DRUCK DPI 510 EMULATION COMMAND SUMMARY 5 9 5 7 1 SUPPORTED COMMANDS POR Qt C Rog 5 9 5 7 2 RESPONSE FORMA I idees a hist e i aident 5 10 5 7 3 RESET CONDITIONS titanic 5 10 57A KEYBOARD ENTR oa 5 10 TAST N OI ES E ias 5 10 SAMPLE PROGRAM S iM teu eree EE ca m sa oes C 5 11 5 8 1 SAMPLE PROGRAM 1 7050 GPIB IEEE 488 CONTROLS PRESSURE TO 20 000 FS ai debe ea du S ced be BLU OE 5 11 INTRODUCTION oreet se een as ro Ee rede a t tor ed tto 6 1 OBSERVING THE SOFTWARE VERSION NUMBER 6 1 PREVENTIVEMAINTENAN CE 6 1 6 3 1 INITIATING THE PPI S
25. COPYRIGHT NOTICE Copyright 2003 by Ruska Instrument Corporation All rights reserved This document may not be reproduced in part or in whole without the express written consent of Ruska Instrument Corporation DISCLAIMER No representations or warranties are made with respect to the contents of this user s manual Further Ruska Instrument Corporation reserves the right to revise this manual and to make changes from time to time in the content hereof without obligation to notify any person of such revision TRADEMARK NOTICE KRUSKA is a registered trademark of Ruska Instrument Corporation Trademarks or tradenames are subject to state and federal laws concerning their unauthorized use or other infringements The fact that the product marks or names in this manual do not bear a trademark symbol DOES NOT mean that the product name or mark is not registered as a trademark or tradename Any queries concerning the ownership or existence of any trademarks or tradenames mentioned in this manual should be independently confirmed with the manufacturer or distributor of the product li INTRODUCTION REVISION NOTICE RELEASE REV DATEOF DESCRIPTION NUMBER RELEASE 7050 1D01 A 06 09 03 Original release 111 INTRODUCTION REVISION HISTORY RELEASE 7050 1D01 Revision A 06 09 03 Original release iv INTRODUCTION 7050 Change Language English Japanese Deutch Espa ol 0
26. DIGITAL PRESSURE CONTROLLER MODEL 7050 MODEL 7050 MODEL 7050LP USER S MANUAL RUSKA INSTRUMENT CORPORATION 10311 WESTPARK DR HOUSTON TEXAS 77042 713 975 0547 FAX 713 975 6338 e mail ruska ruska com E http www Ruska com Release 7050 1D01 Revision A Date 06 09 02 1 INTRODUCTION WARRANTY Ruska Instrument Corporation warrants its products to conform to or exceed the specifications as set forth in its catalogs in use at the time of sale and reserves the right at its own discretion without notice and without making similar changes in articles previously manufactured to make changes in materials designs finish or specifications Ruska Instrument Corporation warrants products of its own factory against defects of material or workmanship for a period of one year from date of shipment Liability of Ruska Instrument Corporation under this warranty shall be limited to replacing free of charge FOB Houston Texas any such parts proving defective within the period of this warranty but will not be responsible for transportation charges or consequential damages This warranty is not made for products manufactured by others which are illustrated and described in Ruska catalogs or incorporated in Ruska products in essentially the same form as supplied by the original manufacturer However Ruska Instrument Corporation agrees to use its best efforts to have original suppliers make good their warranties 1 INTRODUCTION
27. Differential or Absolute The Main Menu can always be reached by repeatedly pressing PREVIOUS The model 7050 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 key Less commonly used set up type functions are accessible through the menu function key MAIN MENU 4 3 MENU The menu key is used to access the less commonly accessed configuration type functions This accesses the Setup Calibration Program Test and Display functions MENU 4 5 LOCAL OPERATION 4 3 1 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 MENU SETUP MENU 4 3 1 1 Menu Setup Limits The 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 MENU SETUP LIMITS MENU 4 3 1 1 1 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 PPI will then prevent the pressure from exceeding the high limit 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 pressu
28. ER Do not enter the measured pressure reported by the PPI If necessary use the CLEAR key to correct a mistake in the edit field If the actual pressure applied is within the indicated tolerance the unit will accept that point and the highlighted curser will automatically scroll down to the next calibration step If the actual pressure 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 1 if 3 2 Generate the next pressure calibration point requested by the PPI Apply this pressure using calibration standard and follow the instructions in Step 2 3 entering the actual pressure applied 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 4 1 2 Storing the Coefficients Step 4 4 1 Calibration is complete To exit the calibrati
29. ESE occurs Bit4 Message available Set when a response is ready to be sent Bit3 Questionable status summary Set when an event enabled in QUES ENABLE occurs Bit2 Error event queue not empty Bitl Reserved 0 BitO Reserved 0 Standard Event Status Register ESR Standard Event Status Enable Register ESE Bit 7 Power on Set at power up Bit6 Reserved 0 Bit5 Command error Error in command syntax Bit4 Execution error Error in command execution Device dependent error Device error independent of commands Bit2 Query error Output queue empty when request received 5 7 REMOTE OPERATION Bitl Reserved 0 0 Operation complete Set for OPC command Operation Status OPER EVENT OPER CONDITION OPER ENABLE BitO Calibrating Currently performing a calibration Bit 1 Settling Control setpoint has not been reached Pressure tolerance set by SOUR PRES TOL Bit2 Reserved 0 Bit3 Reserved 0 Bit4 Measuring The instrument is actively measuring Bit5 Reserved 0 Bit 7 Reserved 0 Bit8 Self test in progress Bit9 Reserved Bit 10 Reserved 0 Bit 11 Reserved 0 Bit 12 Reserved 0 Bit 13 Reserved 0 Bit 14 Program running 15 Reserved 0 Questionable Status QUES EVENT QUES CONDITION QUES ENABLE 5 5 0 gt Reserved Bitl Reserved 0 Bit2 Time is questionable Set when clock has not been set Bit3 Temperature is questionable Sets when oven temperature is
30. F2 then System F5 and then Reset F1 4 3 2 MENU CALIBRATE The Menu Calibrate command is used to perform the calibrations on all of the sensors utilized by the PPI The 7050 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 7050 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 7050 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 PPI was re zeroed 4 11 LOCAL OPERATION The calibration section in the PPI can be password protected to prevent any unauthorized entry into the calibration section of the system Please refer to the Maintenance Section Section 6 0 of the manual for more detailed information regarding the calibration of the 4 3 2 1 Calibration Password The calibration password allows the user to protect access to PPI calibration constants and the calibration procedure If the calibration password is set to any number other than zero it is required before the user is allowed to calibrate the
31. ION 1 0 GENERAL INFORMATION Wed INTRODUCTION S rre ch nubes C 1 1 1 2 GENERAL INFORMATION st a be bes 1 1 1 3 REATURES eee ta uota Le NL er Le 1 1 1 4 STANDARD EQUIPMENT 8 1 2 SECTION 2 0 THEORY OF OPERATION 2d dNTRODEUCTIONL 2 2 1 Dae POMP SUR PE Sate REIN 2 1 2 3 ELECTRONICS MODULE cco aka doe otra ito e eee rra peo ai 2 2 2 3 1 BOARD 4a a e da tet tee dipe iet 2 2 2 3 2 MICROPROCESSOR 00000 2 2 2 3 3 IEEE 488 INTERFACE a een 2 3 2 04 FRONT PAN BL si 2 3 2 4 PNEUMATICS MODULE 3d a Ea ta 2 3 2 4 1 MEASURE 5 2 2 00 0 0 02 0 2 2 5 2 4 1 1 Reference Porti c eui een oo et eo eee Eee 2 5 2 4 1 1 1 Barometric Sensor eee 2 5 254 4152 Test on a edt b ata o Beo e 2 6 2 5 TRANSDUCER MODULE 54 o Ebr beo debet eo e oaks 2 6 2 5 1 QUARTZ BOURDON TUBE SENSOR TRANSDUCERO1 2 6 2 5 2 SENSORBOARD d it a 2 7 22335 LINEARIZATION TERM RR ie at 2 7 2 5 4 AUXILIARY SENSORS vaca nd 2 8 2 5 4 1 Case Reference Vacuum 2 8 245 SOFTWARE OUR EL 2 8 2 6 1 SAFETY CONSIDERATI
32. NU DISPLAY screen and verifying that the temperature is at 50 In addition to the temperature this screen will show the duty cycle of the oven 2 8 THEORY OF OPERATION 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 PPI will generate an Oven Control Failure error messages The operator can review the temperature and duty cycle of the oven by pressing the MENU DISPLAY keys The unit must be 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 If operating the instrument in a very cold environment and the oven duty cycle is at a high percentage gt 9096 you will need to turn the fan off If you are operating in a warm environment or when multiple systems are housed in consoles without adequate ventilation the system may become too hot and generate the oven control failure error message lf operating the instrument in a warm environment and the oven duty cycle is at a low percentage gt 1096 you will need to turn the
33. ONS sobs Oe ete 2 8 AA AN ED 2 8 2 6 1 2 Pressure Reading and Cortes 2 9 SECTION 3 0 INSTALLATION INTRODUC TIO WN aa T 3 1 352 UNPACKING TRE e erae e eod 321 NEED NI OI MANET RS 3 2 3 4 POWERING UP THE guae dist unde 3 2 vii INTRODUCTION 3 4 1 OBSERVING THE PPI S FULL SCALE RATING 3 2 3 5 PNEUMATIC CONNECTIONS ic ctu cot ine rte E deg asi 3 2 2 94 TESEBORISGA aos Cnr eR 3 2 3 5 2 REFERENCE PORT aodio Rad tan epe bo ed celica het te besides 3 3 SECTION 4 0 LOCAL OPERATION A ETE det es cde 4 3 4 1 1 SELECTING LANGUAGE curar atre UR SS OO 4 4 4 1 2 SELECTING MODE OF OPERATION cusco 4 4 4 1 2 1 Simulated Absolute Instr ments 4 ete 4 4 4 1 2 2 True Absolute with Vacuum Reference Option 4 5 42 A o EH en CO te tm a 4 5 2 3 2 OA Ere tree DILE HG OS Us Ee AU ue oat ek 4 5 MENU SETUP auch ee wes v durer eite 4 6 4 3 1 1 Menu Setup Elles cer a ee tia 4 6 24 35 45 tere re S RR ER EG 4 6 253 dz E DRE ve tote 4 7 EA A te eR 4 7 4 3 1 1 4 COS certa is rerba 4 7 43512 Menu Setup USC oco t Stands iret petas 4 7 4 3 1 2 1 Gas Head Pressure Correction
34. OTE The PPI 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 rack Although the zeroing process will compensate for a slightly unlevel mounting the PPI should be mounted to within 5 of level TABLE 3 1 GENERAL SPECIFICATIONS GENERAL PARAMETERS Parameter Vduwe 2 all all all all all all there is any condensation when storing the PPI 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 3 1 INSTALLATION 3 3 CAUTIONS The following cautions should be heeded at all times to ensure safe operation of the PPI 1 Never operate the PPI with the cover removed The power supply has internal voltages near 400 volts 2 Never apply more than 120 of the PPI s full scale as a pressure supply Pressure supply must be regulated and meet all criteria as stated in Appendix A of this manual 3 Never apply more than 110 of the PPI s full scale to the test port Never try to control while a pressure source is connected to the test port 4 Do not expose the instrument to thermal and mechanical shock or vibration This may affect performance and require rezeroing 5 See the safety summary in the introduction 3 4 POWERING UP THE PPI First plug the power
35. SELF TEST M hai 6 1 632 MOISTURE FILTER ars 6 2 6 3 3 PARTICLE hoes tette 6 2 6 9 4 VACUUM PUMPS vt rece yeu eder a edat 6 2 0 9 9 PROCESSOR DATE EAR DR Aa o Rid 6 3 GALIBRATIO Ni cats toes Dea esu cole nods tern ERU UNSER 6 3 6 4 1 CALIBRATION INSTRUCTIONS nr e Rene Ro ho anne 6 3 Preparations etos 6 3 6 4 1 2 Storing the s 6 6 6 4 2 VACUUM NEGATIVE GAUGE CALIBRATIONS 6 7 6 4 3 RPT CALIBRATION SIMULATED ABSOLUTE 6 8 6 4 4 EDITING THE CALIBRATION COEFFICIENTS 6 8 Db S ZEROING S cds eis cO 6 9 6 4 5 1 Gauge and Vacuum Negative Gauge Instruments 6 10 6 4 5 2 Absolute Instruments 2 2 6 11 6 4 5 3 RPT Simulated Absolute Instruments 6 12 SENSOR PHOTOCELL ZEROING eis e tla OR xa ds 6 12 FAN OPERATION S poen uere ia 6 15 ix INTRODUCTION 6 7 SYSTEM SOFTWARE UPDATE PROCEDURE tte tdt tn hri 6 15 6 8 REPLACEMENT PARTS s ico toa ore A A 6 16 SECTION 7 0 PREPARATION FOR STORAGE amp SHIPMENT Fl DISCONNECTING THE PP inre iE ec e EL et ero treten 7 1 7 2 PACKING INSTRUCTIONS oie weet tl e ateos 7 1 723
36. TY 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 specifications 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 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 ihe users definition of these terms differ from the manufacturers and therefore cause considerable confusion For instance the user may b
37. U SETUP SYSTEM The software version number will appear on the screen 3 Press PREVIOUS to return to the previous screen 6 3 PREVENTIVE MAINTENANCE Although the PPI is designed to be nearly maintenance free occasional preventive maintenance is required to keep the PPI s performance optimal 6 3 1 INITIATING THE PPI S SELF TEST To test the PPI s hardware software and pneumatics follow the steps below 1 If necessary press PREVIOUS several times to return the display to the Main Menu 2 Select MENU TEST SELF Electrical Pneumatic MENU TEST SELF MENU 3 Press ELECTRICAL F1 The electronics self test will run and display the results 4 Press PREVIOUS to return to the previous screen 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 The pneumatics test runs nine tests on the pneumatics module 6 1 MAINTENANCE TABLE 6 1 ELECTRONICS SELF TEST RIC Part Tests the processor chip Replace processor 7215 586 3 board Tests the real time clock Replace processor 7215 586 3 board Tests the 10 ms interval timer Replace processor 7215 586 3 board board oven Allow oven to warm up CAUTION The PPI should only be opened by qualified electrical mechanical service technicians Lethal voltages are present and exposed in the power supply and display 1 Turn
38. ations This includes setting the control step size range of bar graph pressure gas head display pressure filter display resolution digits and audible key click 100 000 psi Gas Head Atmosphere Pressure Filter Display Digits Key Click Menu Setup User Menu 4 3 1 2 1 Gas Head Pressure Correction The term head height refers to the vertical distance between the sensing element in the device under test and the PPI s pressure reference plane Once the user inputs the head height and selects air or nitrogen the PPI automatically corrects for head pressure 1 The Pressure Reference Line on the PPI 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 4 7 LOCAL OPERATION 2 Determine the vertical distance between the PPI Pressure Reference Line and the reference plane of the device under test 3 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 4 The head height is set from the Setup User Menu From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 then Setup F2 and then User F2 5 Press Medium F3 to select either Air or Nitrogen The selected units will be highlighted Press Position F4 to select if the position of the Device Under Test is e
39. ature line pressure head pressure time response and controller effects It may include other influences that are very specific to one manufacturers instrument t 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 degree Celsius temperature effect from a calibrated temperature of 20 degrees Celsius and the instrument is to be used in an environment where the temperature will vary from 15 to 25 degree Celsius then a 0 005 of full scale uncertainty should be included in the uncertainty analysis for ambient temperature effects 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 of Uncertainty in Measurement This statistical approach combines all of the uncertainty components in quadrature RSS In this approach it is important to define the level of confidence that all of the uncertainty components are defined For instance all of the uncertainty specifications that Ruska
40. be pressed before SCPI calibration 01 02 03 04 B 2 APPENDIX B
41. ble 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 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 number Seal the carton using gummed tape Address the carton to RUSKA INSTRUMENT CORPORATION 10311 WESTPARK DRIVE HOUSTON TX 77042 USA Label the carton with the following labels THIS SIDE UP HANDLE WITH CARE DO NOT DROP and FRAGILE If the original Ruska shipping carton is utilized for this shipment the above markings are preprinted on the carton 7 2 STORAGE amp SHIPMENT FIGURE 7 1 PACKING THE PPI 7 3 SHIPPING INSTRUCTIONS Ruska 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 is likely Again it is essential that the procedures mentioned in sections 7 1 through 7 3 be strictly adhered to in order to prevent any shipping and handling damage to the instrument 7 3 STORAGE amp SHIPMENT NOTES 7 4 STORAGE amp SHIPMENT APPENDIX A SUMMARY OF SPECIFICATIONS UNCERTAIN
42. by a relief valve 2 4 1 1 1 Barometric Sensor For all Simulated Absolute instruments the Reference Port is monitored by a precision barometric sensor Figure 2 2A This sensor provides the barometric offset that allows the Gauge mode PPI to function in a simulated Absolute system 2 4 1 1 2 For instruments that have the vacuum reference option a vacuum gauge is connected to the reference port The operator can connect a vacuum pump to the reference port of the 7050 and evacuate its reference The vacuum sensor is then used to zero the 7050 in the absolute mode and to track any vacuum changes that occur in the reference ports 2 5 THEORY OF OPERATION 2 4 1 2 Test Port The Test Port connects the DUT to the Pneumatics Module The Test Port is protected by a relief valve 2 5 TRANSDUCER MODULE 2 5 1 QUARTZ BOURDON TUBE SENSOR TRANSDUCERO1 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 5 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 or sapphire window onto the mirror affixed to the helical tube as shown in Figure 2 6 The mirror reflects the light back through the window and strikes two matching photodiodes When there is zero
43. dard Ruska Model 2465 DWG 0 001096 of Reading Lc t Temperature Included in A above 0 00096 of Reading 2 sigma Expanded Uncertainty RSS 0 009 of Reading per year A 3 APPENDIX A The following two tables are uncertainty analysis examples for a single range 7250 based on a three month and a yearly calibration Uncertainty Analysis 3 Month Calibration Interval Uncertainty Ruska Model 7050 2 sigma A Performance Linearity Hysteresis Repeatability 0 00396 of Full Scale and Temperature B Stability 3 months 0 001996 of Reading per 90 days C Calibration Standard Ruska Model 2465 DWG 0 001096 of Reading Lc ctm aa Temperature Included in A above 0 00096 of Reading 2 sigma Expanded Uncertainty RSS 0 003 of Full Scale RSS with 0 002496 of Reading per 3 months Uncertainty Analysis One Year Calibration Interval Uncertainty Ruska Model 7050 2 sigma A Performance Linearity Hysteresis Repeatability 0 00396 of Full Scale and Temperature B Stability 1 year 0 0075 of Reading year C Calibration Standard Ruska Model 2465 DWG 0 0010 of Reading Lc cs Temperature Included in A above 0 00096 of Reading 2 sigma Expanded Uncertainty RSS 0 003 of Full Scale RSS with 0 0076 of Reading per year A 4 APPENDIX A A 2 SPECIFICATIONS GENERAL SPECIFICATIONS Pressure Range Display Display Resolution Electrical Power Operating Temperature
44. e IEEE 488 2 and SCPI commands The PPI allows the following port setups Baud Rate 1200 2400 9600 or 19200 Data Bits 7 or 8 Parity Even Odd or None Stop Bits 2 Handshaking XON XOFF 5 1 REMOTE OPERATION The RS 232 connection is a DB 9P connector found on the back panel of the PPI It is located on the processor board The following pins are used all other pins are reserved Pin Direction Signal 2 In RXD Receive Data 3 Out TXD Transmit Data 5 GND Ground 7 Out RTS Request to Send 5 2 REMOTE LOCAL OPERATION In Local mode the PPI is operated manually through the front panel Section 4 0 covers local operation The PPI always powers up in the Local mode In Remote mode the PPI 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 PPI will disable the local keyboard until the Go To Local GTL interface message is received or the REN Remote Enable line is unasserted This method cannot be used on the serial interface 2 Issue the 5 command SYSTEM KLOCK ON to lock the local keyboard The PPI will disable the local keyboard unti
45. e box and any portion of the 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 PPI If the PPI is being packed for long term storage more than 30 days place a desiccant bag inside the box 7 1 STORAGE amp SHIPMENT The PPI must be prepared for shipment in the following manner l Ruska Instrument has an RMA procedure in place Please contact the Customer Service Center to obtain an RMA number prior to returning any equipment to Ruska Have the following information available when contacting Ruska the part number the serial number the purchase order number the billing and ship to address and the buyer s name and telephone number This information plus the number must be attached to the unit when it is shipped to Ruska Instrument There will be a minimal charge for inspection and or evaluation of returned goods Enclose the PPI in plastic or any good water barrier material Antistatic material is recommended If the original shipping carton is not usable or available use a double walled corrugated carton with a 275 rating The recommended carton size is 25 1 2 x 19 1 2x 12 3 8 inches 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 interchangea
46. e periodic zeroing The primary sensor is zeroed according to the instructions in Section 6 4 5 1 or 6 4 5 2 The barometric sensor is zeroed according to the following instructions 1 Verify that the Reference Port is open to atmosphere 2 Enter the Calibration screen by selecting MENU CALIBRATE 3 Select the Atmospheric Sensor by pressing the Sensor F6 key until the words Atmospheric Sensor is displayed above the calibration coefficients 4 To begin the zeroing process press ZERO If the calibration access code is enabled enter it at the prompt The zeroing screen will appear NOTE The next step requires the use of a properly calibrated standard This zeroing process does contribute directly to the overall accuracy of the system since the pressure applied to the sensor is a non zero differential pressure 5 Enter the current barometric pressure Press ENTER 6 5 SENSOR PHOTOCELL ZEROING If the error message Mechanical Zeroing Needed is displayed the sensor photocell must be zeroed The following steps describe this process CAUTION The PPI should only be opened by qualified electrical mechanical service technicians Lethal voltages are present and exposed in the power supply and display NOTE The sensor MUST have zero differential between the Test port and Reference port For Gauge PPls apply atmospheric pressure to the Reference port For Absolute PPIs apply a vacuum to the Reference port 200 uHg
47. ected to the exhaust port 4 3 3 2 Menu Test Remote Test The Menu Test Remote section of the system is 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 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 13 LOCAL OPERATION Serial 1 Xmt Rec GPIB Not Installed Msgs 0 6 Overruns Xmt Ins 0 SPoll00 Status 00 00 Framing Breaks MENU TEST REMOTE GPIB MENU MENU TEST REMOTE SERIAL 1 MEMU 4 3 3 3 Menu Test Shop The Menu Test Shop1 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 the Maintenance Section 6 0 4 3 4 MENU DISPLAY The Menu Display is used to conveniently monitor most of the sensor output parameters It is primarily used for troubleshooting MENU DISPLAY MENU 4 3 4 1 Menu Display Blank This is used as a screen saver in the 7050 4 14 LOCAL OPERATION SECTION 5 0 REMOTE OPERATION 5 1 CAPABILITIES The PPI can be operated remotely by a computer Two interfaces are su
48. ed by the user These factors are given in Table 2 1 Data that is subject to change after the PPI leaves the factory are held in electrically erasable programmable read only memory EEPROM This includes the current units of measure 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 PPI 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 is the lithium battery The battery continuously updates the PPl 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 may 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 PPI 2 2 THEORY OF OPERATION TABLE 2 1 CONVERSION FACTORS Unless specified otherwise conversion factors are based on ANSI 268 1982 kPa x 02952998 cmo x 1019744 kPa x 4 014742 E x 0 0101972 mmHg Millimeters of mercury 0 C kPa x 7 500605 cmHg Centimeters of mercury 0 C kPa x 0 7500605 knots NASA TN D 822 Feet MIL STD 859A meters per MIL
49. elieve 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 consist only of item 1 above The result would be that the instrument would not be capable of meeting the users application because it would not meet the users definition of Accuracy Long Term Stability defines how the instrument drifts with time This specification can be utilized to define the calibration interval for the standard Some manvfacturers 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 manufacturers stability specification based on time without knowing the characteristics of their device Some manufacturers identify that their stability specification is 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
50. erating one of the calibration pressures and the calibration procedure should be repeated Remove the pressure source from the Reference Port EDITING THE CALIBRATION COEFFICIENTS If the PPl s memory is erased but the calibration coefficients are known the user can restore the coefficients to the PPI by following the directions below 6 8 MAINTENANCE 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 1 Verify that the PPI is in Measure mode Section 4 0 2 Enter the Calibration screen by selecting MENU CALIBRATE 3 When you first enter the Calibration menu the top line of the display will indicate which sensor is being the viewed The sensors coefficients are then shown below the sensor label The first sensor that is shown is the primary measuring sensor This is indicated by the word Primary displayed in the top of the display To cycle through the various sensors that exist in the system you would press the Sensor F6 function key The two common sensors that would be calibrated would be the Ruska sensor which would be labeled as Primary and if the unit has the optional Barometric Reference sensor this would be labeled as Atmospheric Sensor 4 To edit the calibration coefficients press the EDIT button If the calibration acc
51. ere must be a cutoff valve located between the Vacuum pump and the bell jar Close the Cut off valve to isolate the DUT test port from the bell jar Open the Vacuum Pump Valve to pull a hard vacuum on the bell jar to seal the bell jar and to float the masses Once the masses have risen in response to evacuation of the bell jar close the reference vacuum pump cutoff valve Use the metering valve on the bell jar to adjust vent the bell jar vacuum towards atmosphere until the masses begin to float Close the metering valve as soon as the masses begin to float Open the bell jar cutoff valve to the test port of the DUT close the exhaust Vent valve and use the pressure adjuster handwheel to adjust float position of the deadweight gauge to float the piston at mid float position 6 7 MAINTENANCE 6 4 3 RPT CALIBRATION SIMULATED ABSOLUTE A span correction can be applied to the RPT barometric sensor This correction is done using the PPI software and can be performed without removing the RPT from the PPI chassis l 2 3 10 11 12 6 4 4 Place the Measure mode Remove all pressure sources from the system Connect a pressure standard to the Reference Port of the PPI If desired change the PPI s units of measure see Section 4 to match those of the calibration standard To access the Calibration screen from the Main Menu select MENU CALIBRATE Select the atmospheric sensor by pressing the Sensor
52. ess 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 5 Use the rotary knob to highlight the coefficient to be edited The terms are coefficients of a linear regression analysis 6 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 7 Repeat steps 4 and 5 until all coefficients are correct NOTE In addition to saving the calibration coefficients to the 5 memory separately record the calibration coefficients and store this backup in a safe place 8 To exit the editing procedure without storing the calibration coefficients in memory press CANCEL To store the calibration coefficients in memory select DONE F6 9 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 6 4 5 ZEROING The zeroing procedure is performed to correct for system zero shift and does not require a full calibration The most important requirement for performing a valid zeroing 6 9 MAINTENANCE procedure is to guarantee that there is
53. et 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 OA 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 3 REMOTE OPERATION 5 4 3 ANSI IEEE 488 2 1987 COMMAND SUMMARY CLS ESE ESE number ESR2 IDN2 OPC OPC RST SRE SRE number STB TST WAI 5 4 4 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 upper pressure limit MEASure PRESsure TEMPerature2 TEMPerature3 PRESsure2 PRESsure3 SSLEW CALCulate LIMit LOWer lt number gt SSLEW lt number gt UPPer lt number gt TARE VALUE lt number gt STATe ON OFF CALibration PRESsure VALue lt n gt number DATA POINts VALue lt n gt VALue lt n gt lt number gt CALibration POINts
54. f measure Section 4 0 to match those of the calibration standard 5 Set the gas head to 0 Select MENU SETUP USER 6 To access the calibration screen select MENU CALIBRATION Primary 110 00 psi 272 Calibrate COL 288 HOZ 280 507 0 0000176 K1F 12870 K10 328 K11 0 0000200 K12 344 Last Zero 0000 00 00 00 00 00 Last Calibrate 0000 00 00 00 00 00 Sensor 7 When you first enter the Calibration menu the top left hand side of the display will indicate which sensor is being the viewed The sensors coefficients are then shown below the sensor label The first sensor that is shown is the primary measuring sensor This is indicated by the word Primary displayed in the top of the display To cycle through the various sensors that exist in the system you would press the Sensor F6 function key Assure that you are in the screen that is labeled as Primary 8 To begin the calibration process press the Calibrate F2 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 Step 1 1 1 begin step 1 of the calibration process select Zeroset F1 The zero procedure will start when the reading is in range and stable or when OK F6 is pressed Press OK F6 onl
55. fan on See Section 6 6 for fan operation When the operator changes the status of the fan it will remain in that condition until the operator changes the setting MENU DISPLY MENU 2 6 1 2 Pressure Reading and Correction The sensor s analog output is processed by an analog to digital circuit that results in an output referred to as counts This output is corrected for the applied effects listed below The counts are 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 by the control algorithm to adjust and correct the pressure signal 2 9 THEORY OF OPERATION Zero Coefficients CsH CsL HsZ SsZ Zero correction for High FSR Full Scale Resistors Value is in counts 7 381 975 full scale of current sensor Zero correction for Low FSR Value is in counts 7 381 975 full scale of low FSR Hardware zero correction 0 to 4095 center is 2048 Zero corrections scaling factor Ratio of High FSR to Low FSR Used only 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 O Range Unused 4 Valid High FSR Range 5 Valid Low FSR Range KnO Kn1 Kn2 Calibration constants for range Ku 2 B 4 docu y Where A is the zero corrected counts 7 381 975 full scale of current
56. ftware version Cal Enter calibrate menu Zero p Zero Sensor Test Enter Test menu Self Perform self test Remote Display remote status Shop1 Display solenoid valve status Disp Display transducer values Blank Screen Saver ELE E FIGURE 4 2 MENU TREE 4 2 LOCAL OPERATION 4 1 TUTORIAL To begin the tutorial first verify that the PPI is powered up and that the pneumatic connections have been completed The PPI should display a screen similar to the one shown below The right hand side of the display should show the options At power up there may be errors relating to the default settings If an error message is displayed in red at the bottom of the screen press F6 then press PREVIOUS If multiple errors exist you will need to press the F6 key multiple times to clear all of the errors MAIN MENU This is the Main Menu It is at the top level of the menu tree see Figure 4 2 and all descriptions in this manual start from this point The double sized numbers in the top center of the display shows the current measured pressure 0 00 psi diff The right side of the screen shows a bar graph displaying the current pressure relative to a user configurable full scale 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 Step 1 Change the pressure units T
57. h 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 6 2 MAINTENANCE solenoid and the vacuum is vented to atmosphere Periodic changing of vacuum pump oil as recommended by the vacuum pump manufacturer should also be done 6 3 5 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 f 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 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 RIC 4 725 5 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 Section 4 3 1 5 1 6 4 CALIBRATION To keep the PPI 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
58. he units are changed by selecting the UNITS key on the keypad Vacuum micron kPa 5 0 kgf cm mmHg 0 C inHg 0 C inHg 60 F 0 4 C MOLEC 20 inH2O 25 C user user2 atm mbar FS feet meters knots km hr Pa hPa MPa kgf cm mmHg 0 C cmHg 0 C inHg 0 C inHg 60 F 0 4 C inH20 4 C 20 inH2O 25 C user user2 atm mbar FS feet meters knots km hr Pa hPa MPa UNITS MENU 4 3 LOCAL OPERATION Step 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 Step 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 4 1 1 SELECTING LANGUAGE The 7050 PPI can operate in a variety of different languages To select a different language press the Mode key two times MODE MODE The current language will be highlighted Use the rotary knob to highlight a new language and hit the ENTER key to select that language 4 1 2 SELECTING MODE OF OPERATION The 7050 PPI is offered in three different modes These are gauge only absolute only simulated absolute which operates in b
59. ime 0 to 11 Set setpoint as fraction of P value 0 to 11 Set pre programmed setpoint 0 Disable error reporting Enable error reporting 5 7 2 RESPONSE FORMATS NO Pressure or Setpoint gt lt REM LOC gt RnSnDn nn 1 Pressure or Setpoint gt Onn 2 REM LOC RnSnDnCnlnFn lt In Limit Status nn NA nEnJnVnnnnUaaaa NOTE Secondary addressing is not supported 5 7 3 RESET CONDITIONS NO DO FO IO 91 50 W002 5 7 4 KEYBOARD ENTRY MENU SETUP REMOTE 510EMUL Termination CR LF EOI CR EIO LF EOI or EOI Zero Delay Delay for zero stabilization F1 F2 F3 Rates Specify rates used by JO J1 J2 MENU SETUP REMOTE 510EMUL F1UNIT MENU SETUP REMOTE 510EMUL F2UNIT MENU SETUP REMOTE 510EMUL F3UNIT Select units for SO S1 S2 MENU SETUP REMOTE 510EMUL RATIOS Specify ratios used by to 11 MENU SETUP REMOTE 510EMUL PRESETS Specify presets used by 0 to 11 5 7 5 NOTES Format Upper and lower case are equivalent Spaces and equal signs are ignored before numeric values Spaces commas semi colons and colons are ignored before and after commands 5 10 REMOTE OPERATION Zeroing The Ruska sensor takes longer to zero This time can be set from the front panel The default is 5 seconds but this may need to be increased especially for absolute units When the zero command is received the zeroing valve is opened the system waits the zero delay time and then the sensor is zeroed Rate If the ra
60. int The operator can re check this pressure point prior to completing and accepting the full calibration 2 2 Step 1 actual value will be highlight This is your first pressure point in the calibration procedure NOTE the PPI has the Vacuum Negative Gauge Option or the Barometric reference the first two points in the procedure will show the negative pressures that should be generated to calibrate the sensor in the negative gauge direction You are not required to perform both the negative and the positive gauge calibrations every time the unit is calibrated If you want to calibrate only the positive pressures using the rotary knob move the highlighted curser down to the first positive pressure step and generate all of the positive pressures in the procedure When you are complete with the positive points hit the Done key the unit will maintain the older coefficients for the negative gauge portion of the sensor and calculate new coefficients for the positive gauge ranges Conversely you can calibrate just the negative gauge section if desired However you must complete all of the positive or negative gauge steps in the procedure to complete a valid calibration 2 3 Using your calibration standard generate the pressure shown in the Apply column When the measured pressure stabilizes use the PPl s numeric keypad to enter the actual pressure applied by the calibration standard and 6 5 MAINTENANCE NOTE then press ENT
61. interface are separated into modules making maintenance faster and easier 1 1 INTRODUCTION Attractive Desktop Packaging A sturdy aluminum case houses all of the PPl 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 PPI quickly tests its hardware and software After the PPI 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 On single sensor units only a three point calibration is required to fully characterize the instrument On instruments that integrate multiple ranges such as the 7050i and 7050LP additional calibration points are required Automatic Zero Adjust At the user s request the PPI s software automatically performs the zero adjustment with no potentiometers to tune Automatic Head Correction The PPI automatically corrects for head pressure between the PPI 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 PPI is not sensitive to the type of gas used within the system the user can select either instrumentation air or nitrogen allowing the PPI to automatically make pressure head correct
62. ion data has been lost Check all parameters to be sure they are correct 35 3 z 500 50 502 503 531 Oven Temp Overrange Either the transistor that drives the heater for the quartz Bourdon tube sensor section 2 or the oven temperature sensor itself is malfunctioning To observe the oven temperature select OK then select MENU DISP Check the transistor and sensor for malfunction requesting service section 7 if necessary 0 50 Le Lu Lm FS Lu Bast EN a0 00 EM E EN E E B 1 APPENDIX B Case Pressure Overrange Select OK then reduce the pressure at the case reference port to 30 psia or lower Mechanical Zeroing Needed The zero point of the quartz Bourdon sensor is beyond the range of the compensation circuit The zero is adjusted by the software but should be manually adjusted for complete accuracy Oven Control Failure The temperature controller is unable to keep the sensor at the proper temperature Sensor Communication Error Unable to Communicate with 7215xi Sensor Sensor Calibration Lost The 7215xi sensor has lost its calibration and must be recalibrated Factory Data Lost Internal factory constants have been lost Contact Ruska for more information commands can be executed 800 Solenoid Over Temperature The control solenoids have over heated Wait until they have cooled before entering Control mode 33 40 42 45 Calibration Mode The Calibrate button must
63. ions Choice of Display Units Standard units include inHg at 09 and 60 F kiloPascals bars psi inH O at 4 C 20 C and 25 C kilograms per square centimeter mmHg cmHg at 0 C and cmH O at 4 C Altitude and airspeed units include feet meters knots and kilometers per hour In addition to these predefined units four user defined units are programmable Communications Interface The PPI includes standard RS 232 serial and IEEE 488 interfaces The user s computer communicates with the PPI through the Standard Commands for Programmable Instruments SCPI protocol The 7050 shares the same protocol as the Ruska 7010 7215 7215i and 7215xi therefore it can operate from software written for any of these products The PPI can also be configured to accept existing software written for the Ruska Series 6000 Digital Pressure Gauge Controller or the Druck model 510 1 4 STANDARD EQUIPMENT amp OPTIONS A standard PPI includes this manual and a power cord Although the standard PPI is fully functional with just these items and the appropriate pressure and vacuum supplies the following options are also available NVLAP Accredited Calibrations Ruska received formal accreditation from the National Voluntary Laboratory Accreditation Program NVLAP which is administrated by the National Institute of Standards and Technology NIST NVLAP has assigned Ruska laboratory code 200491 0 to indicate that our accredited calibration services are in co
64. ither Above or Below the 7050 The selected units will be highlighted and appear in the Gas Head description 7 Use the rotary knob to highlight the label Gas Head 8 Use the numeric keypad to enter the height in the selected unit 9 Press ENTER to accept the entry 4 3 1 2 2 Atmosphere The nominal barometric pressure value for the location that the PPI is utilized should be entered for atmosphere On gauge mode instruments 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 PPI and the DUT 4 3 1 2 3 Pressure Filter is used to adjust the degree to which the front display pressure value is filtered A value of four 4 is 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 4 3 1 2 4 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 Setup User Menu From the Main Menu press PREVIOUS until the Main Menu appears press Menu F6 then Setup F2 and then User F2 2 Turn the rotary knob until the label Display digits is highlighted 3 Turn the rotary knob further until the desired number of digits from the default resolution is highlighted 1 0
65. l the command SYSTEM KLOCK OFF is received 3 Issue the 5 command DISPLAY ENABLE OFF or DISPLAY TEXT lt string gt These commands will disable the local display in addition to locking the keyboard The command DISPLAY ENABLE ON will restore the local display and keyboard operation Local operation may also be restored by turning the PPI off and back on 5 3 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 Use the rotary knob to highlight the desired parameter 3 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 5 2 REMOTE OPERATION 4 Repeat steps 2 and 3 to set all parameters needed 5 4 DEVICE MESSAGES 5 4 1 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
66. lled to 50 C The Duty cycle indicates the percentage of time that the oven control is turned on in order to maintain the oven at 6 14 MAINTENANCE 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 9096 If operating the instrument in a very cold environment and the oven duty cycle is at a high percentage gt 9096 you will need to turn the fan off If you are operating in a warm environment or when multiple systems are housed in consoles without adequate ventilation the system may become too hot and generate the oven control failure error message lf operating the instrument in a warm environment and the oven duty cycle is at a low percentage gt 1096 you will need to turn the fan on When the operator changes the status of the fan it will default to that condition until it is changed by the operator Test Closed Zero Closed Low Closed MENU TEST SHOP 1 MENU To turn the fan on or off press Menu F6 from the Main Menu then Test F5 then Shop F5 Use the rotary knob to highlight either fan Off or On Press ENTER to select 6 7 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 7XXX 9 pin to 9 pin null modem cable minimum pinout 2 3 3 2 5 5 1 When ap
67. mode in addition to gauge mode The difference between these two options are that the barometric option would not require an external vacuum pump to measure absolute pressures The vacuum reference option would provide a more accurate absolute measurement however it would require and external vacuum pump evacuating the reference port to measure absolute pressures The valves filters and transducers that make up the pneumatics module of a Gauge mode or Simulated Absolute PPI are shown in Figures 2 2a The schematics for the Absolute mode PPI is shown in Figure 2 2b REFERENCE PORT BAROMETRIC REFERENCE SENSOR SIMULATED ABSOLUTE OPTION PRIMARY SENSOR OPTIONAL VACUUM SENSOR FIGURE 2 2A MODEL 7050 PPI GAUGE PNEUMATICS DIAGRAM 5 to 2500 psig 34 kPa to 17 2 MPa Full Scale Ranges 2 4 THEORY OF OPERATION REFERENCE PORT VACUUM SENSOR FIGURE 2 2B MODEL 7050 PPI ABSOLUTE PNEUMATICS DIAGRAM TO 50 PSIA 340 kPa FS 2 4 1 MEASURE MODE PNEUMATICS Figures 2 2A through 2 2C summarizes the Pneumatics of the PPI 2 4 1 1 Reference Port For gauge measurements the Reference Port is left open to atmosphere The Reference Port is isolated from the Test Port by a solenoid valve that is closed during ihe PPl s Measure mode When the user commands the PPI to perform the zeroing process the solenoid automatically opens and the pressures on the Reference Port and Test Port become equal The Reference Port is protected
68. mpliance with all relevant requirements of ISO IEC 17025 1999 and ISO 9002 1994 Ruska s calibration laboratory can provide an optional accredited pressure calibration The NVLAP calibration certifications are optional and must be requested at time of order 1 2 INTRODUCTION Rack Mount Kit This 6 969 kit meets ANSI EIA requirements for a 4U 19 rack mount kit 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 Ruska Instrument Sales in the U S at 713 975 0547 TABLE 1 1 OPTIONS LIST FOR THE MODEL 7050 PPI Ruska Instrument Corp Part Number RIC LabView Driver National Instruments Downloadable from World Wide Web Rack Mount Kit Cabinets 18 24 inches deep 7250 903 Vacuum Pump 115 VAC 50 60 Hz 99877 800 230 VAC 50 60 Hz 99877 860 Power Cord USA Canada Central Europe 16 81 16 81 16 86 Power Cord India Japan Israel 16 96 16 93 16 97 Power Cord Australia New Zealand 16 95 1 3 INTRODUCTION NOTES 1 4 INTRODUCTION SECTION 2 0 THEORY OF OPERATION 2 1 INTRODUCTION The PPI s power supply electronics pneumatics and sensor combine to form a complete stand alone instrument This section of the manual describes the PPI s component modules Figure 2 1 and provides a general discussion of each m mei uei Lom hurt m Primary Transducer Module 1
69. n 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 is strongly suggested that exhaust gases not be trapped in the work area vi INTRODUCTION TABLE OF CONTENTS WARRANTY eoo teret anu UM ii 2 52522 lt eo ut iii REVISION NOTICE 5 tnmen Peter a deca iv REVISION HISTORY eae ada ned v RS 4 4 2 020 02 vi SAFETY SUMMARY 22252504061 A vi TABLE OF CONTENTS uc freie ls ir kate ipa clad Gate aped vii SECT
70. 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 Section 6 5 for more information The zeroing screen presents several pieces of information 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 6 4 5 1 Gauge and Vacuum Negative Gauge Instruments 1 Verify that the Reference Port is open to atmosphere 2 Enter the Calibration screen by selecting 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 4 Do not disturb the instrument while zeroing is in process 5 Wait for the zeroing procedure to finish 6 Press PREVIOUS to return to the Main Menu 6 10 MAINTENANCE Performing Zero Adjust 6 4 5 2 Absolute Instruments A vacuum pump must be connected to the reference port A vacuum gauge should be installed for measuring the case reference pressure This gauge should be installed as close to the sensor as possible There is an 1 8 inch NPT fitting available for this installation inside the PPI near the se
71. not within range Bit4 Reserved 0 Bit5 Reserved 0 Bit6 Reserved 0 Bit 7 Calibration is questionable Set when the unit has not been calibrated Bit 8 Pressure is questionable Set when the pressure is overranged Bit9 Reserved 0 Bit 10 Reserved 0 Bit 11 Reserved 0 Bit 12 Reserved 0 Bit 13 Reserved 0 Bit 14 Command warning Set whenever a command ignores a parameter Bit 15 Reserved 0 6005 INTERFACE PANEL EMULATION The PPI may be configured to emulate the IEEE 488 command set of the Ruska Single Channel Interface Panel Models 6005 701 and 6005 761 See the Interface Panel User s Manual for a description of the protocol The PPI emulation has the following differences l The PPI is always in Remote mode Byte 1 Bit 1 2 All TI strip outputs must be written as OFF 3 4 Any message written to the PPI that starts with a colon as the first character is No special functions are implemented interpreted as a SCPI command 5 8 REMOTE OPERATION To change from SCPI to Interface Panel Emulation via the remote interface send the following message SYSTem LANGuage 6000 To change from Interface Panel Emulation to SCPI via the remote interface send the following message SYSTem LANGuage SCPI 5 6 SERIAL OPERATION The RS 232 port accepts the same SCPI commands as the IEEE 488 port The commands can be terminated by a carriage return hexadecimal OD or a line feed hexadecimal OA The resp
72. nsor 1 aS Select the desired pressure units using the UNITS key You can change both the unit of measure that the PPI is displaying Pressure and the unit of measure for the vacuum sensor It is not required to have the PPI 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 CALIBRATE Select Zero F1 Do NOT press the Calibrate button When initiating the zeroing command in the PPI it will cycle the internal valves allowing the external vacuum pump to pull a hard vacuum on the Ruska sensor It is recommend that the sensor be pulled down to a vacuum of less than 200 mTorr preferably less than 100 mTorr in order to obtain a proper zero The PPI 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 PPI would also increase if zeroed at higher vacuum levels Wait for the vacuum level on the test port to stabilize Enter the vacuum level as read by the external vacuum gauge and press OK F6 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 6 11 MAINTENANCE 6 4 5 3 Simulated Absolute Instruments Simulated absolute PPI s contain two sensors that requir
73. nt 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 Service 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 Register STB Service Request Enable Register SRE Bit 7 Operation status summary Set when an event enabled in OPER ENABLE occurs Bit6 Service request Set when an event enabled in SRE occurs This bit is not used in SRE Bit5 EBS Event status bit Set when an event enabled in
74. off the PPI and disconnect the power cord from the PPI 2 Locate and unscrew the four screws that secure the cover to the back panel 3 Place your hands near the middle of the cover and slide the cover towards the PPI 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 6 3 2 MOISTURE FILTER The Bourdon tube sensor is hydroscopic An external desiccant filter prevents introduction of moisture and is strongly recommended for high humidity areas The filter should be replaced annually The moisture filter is used with the reference port only absolute only instruments do not need a moisture filter 6 3 3 PARTICLE FILTERS Refer to Appendix A for air supply quality requirements During normal operation the PPI transfers gas both into and out of the device under test DUT When necessary the user is expected to use and maintain an in line disposable particle filter to protect the PPI s pneumatics from any contamination that may exist in the DUT 6 3 4 VACUUM PUMPS 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 pumps 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 switc
75. on procedure without storing the calibration coefficients in memory press CANCEL To store the calibration coefficients in memory select the Done F6 key and the PPI will calculate all of its new coefficients NOTE In additional to saving the calibration coefficients to the 5 memory the user is advised to separately record the calibration coefficients and store this backup in a safe place Step 5 5 1 5 2 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 6 6 MAINTENANCE 6 4 2 VACUUM NEGATIVE GAUGE CALIBRATIONS Vacuum mode is an available option The following configuration should be used when calibrating in the Vacuum mode 2 PRESSURE Tr CONTROLLER FIGURE 6 4 VACUUM CALIBRATION To calibrate in Vacuum mode with the configuration shown in Figure 6 4 the following actions should be taken The system pressure and vacuum inlet valve should remain closed The bottom side of the piston must be open vented to atmosphere and connected to the reference port of the DUT The test port of the DUT must be connected to the bell jar with a cutoff valve to isolate it from the DUT Additionally th
76. onses 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 PPI will stop transmitting Transmission is restarted when the XON hexadecimal 11 command is 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 is disabled the unit will respond to commands without being addressed DRUCK DPI 510 EMULATION COMMAND SUMMARY SUPPORTED COMMANDS B value Set Tare amount CO Go to MEASURE mode Cl Go to CONTROL mode DO D2 Transmit Pressure Reading DI Transmit Setpoint Fxx Ignored IO Disable SRQ SRQ on In Limit D SRQ on Error I3 SRQ on In Limit and Error 14 SRQ on End of Conversion I5 SRQ on Error and End of Conversion I6 SRQ on In Limit and End of Conversion I7 SRQ on In Limit Error and End of Conversion JO J1 J2 Set Pre programmed rate M Unlock keyboard N0 N1 N2 N3 N4 Set talk mode notation Ol Zero P lt value gt Set pressure Setpoint RO Unlock keyboard R1 R2 Lock keyboard 50 51 52 53 Set pre programmed units TO Turn off Tare mode T1 Turn on tare mode to value set to B B must be set first U1 to U23 Set S4 units if S4 is selected this will change current units 5 9 REMOTE OPERATION immediately V lt value gt Set slew rate sets low overshoot mode W lt value gt Set In Limit wait t
77. or board is also used to control and maintain the sensor housing at 50 C 2 5 3 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 PPI s sensing element Ideally this pressure current relationship would be a linear equation of the form I kP 2 7 THEORY OF OPERATION where l 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 is slightly nonlinear The nonlinear portion of this pressure current relationship closely follows the form of a second order polynomial or I aP bP where again P is 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 PPI 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 7050i and 7050LP 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
78. or manually change the calibration constants IMPORTANT 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 then Calibrate F3 2 Press the Access F4 key If there is a password in the system other than O then you must enter the current valid password into the 7050 before it will allow you to modify the password 3 Use the numeric keypad to enter the new calibration password Setting the calibration password to zero allows free access to PPI calibration and constants Press ENTER 4 Press Yes F4 to acknowledge changing the calibration password Press No F5 to reject changing the calibration password 4 3 2 2 Zeroing Ruska recommends that the PPI be zeroed once a day to maintain optimal performance The zero drift specification is defined in Appendix A under General Specifications Refer to Section 6 4 5 for the zeroing procedure On gauge mode instruments the zeroing procedure automatically ties both test and reference ports of the Ruska quartz sensor together and performs the zeroing routine On permanent absolute instruments a vacuum pump and vacuum gauge is required to zero the instrument The optional vacuum gauge sensor should be installed in a port that is located internally to the PPI very near to the Ruska quartz sensor When ini
79. oth gauge and absolute modes Using a barometric reference or true absolute using the vacuum reference option which allows both gauge and absolute modes 4 1 2 1 Simulated Absolute Instruments This 7050 PPI is a Gauge and Vacuum Negative Gauge instrument with a barometric reference sensor The summation of the pressure reading from the measurement sensor in the 7050 and the pressure reading from the barometric sensor provides for the simulated absolute pressure display To change mode from the keypad press Mode then select either Absolute F1 or Gauge F2 or Tare F3 Please note that the available selection may vary from unit to unit For instance on a permanent absolute instrument the Gauge option would not be available but the simulated gauge is via the Tare function Absolute MODE MENU 4 4 LOCAL OPERATION 4 1 2 2 True Absolute with Vacuum Reference Option This 7050 PPI is a gauge and optionally negative gauge mode instrument which also has a vacuum reference sensor connected to internal reference of the primary sensor An external vacuum pump can be used to evacuate the reference port of the 7050 The vacuum sensor is then used to zero the 7050 in the absolute mode and to track any variations that occur to the vacuum when operating in the absolute mode 4 2 MAIN MENU The Main Menu displays the measured pressure in double sized numbers Below the pressure reading is the current unit of measure and mode Gauge
80. peru Td CPC A UPC E UE 5 Check for 7250 Errors n ee ee retval 0 while kbhit ibrsp device amp status7 t Serral poll yy if status7 amp 4 0 Check error bit break retval 1 request 7000 SYST ERR n Get error message cprintf buffer return retval NE RERO ara apar a i ara a aa a a aa write 7000 write a command to the 7250 TOTEM EPDIDOEMEP CEN GN DCN COMETE void write 7000 char s ibwrt device s strlen s eet ahr oe ey et es ea ee ey a et a er ey a et oa ee ee ee oe ee a ee ae ee et as ee ee request 7000 write a query command and read the response A De ges cT UT RP TM um TUS ee ee void request 7000 char s ibwrt device s strlen s ibrd device buffer sizeof buffer 5 15 REMOTE OPERATION THIS PAGE INTENTIONALLY LEFT BLANK 5 16 REMOTE OPERATION SECTION 6 0 MAINTENANCE 6 1 INTRODUCTION Very little maintenance is required for the PPI This section of the manual discusses suggested maintenance procedures 6 2 OBSERVING THE SOFTWARE VERSION NUMBER Follow the steps below to observe the PPI s software version number 1 If necessary press PREVIOUS several times to return the display to the Main Menu 2 Select MEN
81. point shared between two ranges is required Therefore for the 7050i a 5 point calibration is performed and for the 7050LP a 9 point calibration is performed to fully characterize the Ruska quartz sensors 2 5 4 AUXILIARY SENSORS Auxiliary sensors are sensors such as the oven temperature sensor These are reference sensors aligned at the factory and are utilized by the firmware 2 5 4 1 Case Reference Vacuum Sensor The case reference vacuum sensor is an optional sensor The user needs this sensor to zero an Absolute PPI Please note that the uncertainty of the vacuum sensor used to zero the PPI must be considered in the overall uncertainty analysis of the PPI 2 6 SOFTWARE The PPI is a digital software based instrument 2 6 1 SOFTWARE SAFETY CONTROLS 2 6 1 1 Oven Control The oven temperature is 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 which 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 DISPLAY With an exception of the 3000 psi 20 7 MPa version 7050 the high accuracy quartz sensor is housed in a temperature controlled oven There is a 3 hour warm up time required prior to the PPI operating at its optimum precision The user can verify when the instrument is thermally stable by viewing the ME
82. pported IEEE 488 and RS 232 Both interfaces support SCPI Standard Commands for Programmable Instruments The IEEE 488 interface additionally supports emulation of a Ruska Single Channel Interface Panel Models 6005 701 and 6005 761 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 CommonCommands SCPI 1991 0 Standard Commands for Programmable Instruments 5 1 1 IEEE 488 The following identification codes define the interface capabilities of the PPI Identification codes are described in the IEEE 488 standard SH1 Source Handshake Complete Capability Handshake Complete Capability T5 Talker L3 Listener SRI Service Request Complete Capability RL1 Remote Local Complete Capability PPO Parallel Poll No Capability 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 2 RS 232 The RS 232 interface supports standard serial operation from a computer to a single PPI RS 232 supports th
83. propriate Ruska can e mail the latest version of the software for upgrading instruments The e mail will have a zip file attached contains two files UPDATE7 EXE and version Unzip these files into a directory on the PC Set the 7XXX 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 7XXX should both display Complete ot ax Dam 6 15 MAINTENANCE 6 8 REPLACEMENT PARTS The following is a list of the common replacement parts used in the Model 7050 PPI Part Number Description 88 1055 Zeroing Valve 11 763 TFT Display 11 764 Display Inverter Electronic Board 7000 70 Sensor LED Lamp Assembly 7000 71 Sensor Photocell 7250 111 Photocell Adjustment Tool 62 293 Power Supply 23 906 Fan 7250 100 005 Rotary Encoder 7215 PCA KEY Front Panel Keyboard Electronic Card 6 16 MAINTENANCE SECTION 7 0 PREPARATION FOR STORAGE amp SHIPMENT NOTE The procedures given in sections 7 1 through 7 3 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 PPI during shipment This damage is not covered by the carrier s insurance 7 1 DISCONNECTING THE PPI Relieve all pneumatic pressure from the PPI Turn the PPI power switch to the
84. re 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 4 6 LOCAL OPERATION 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 4 3 1 1 2 Low Limit User defined Minimum pressure limit This is the same as the high limit except it is to protect the DUT from low pressure limits 4 3 1 1 3 Slew Limit The slew limit is used by the system to assure that the slew rate is not exceeded If the slew rate is exceeded the PPI will change from the control mode to the measure mode and it will generate an error message to the operator 4 3 1 1 4 Access The test access password allows the user to protect access to configuration and programs If the test access password is set to any number other than zero factory default it is required before the user is allowed to change the limits control parameters or programs IMPORTANT It is recommended that the access password be recorded and filed in a secure location 4 3 1 2 Menu Setup User The Menu Setup User menu is used to setup all of the user specific configur
85. repeatability and hysteresis throughout the operating temperature range Some manufacturers use the word Accuracy in place of Precision however the meaning is identical Zero drift improves with sensor age 3 Additional Uncertainty when operating a gauge mode 7050 or 7050i in the absolute mode This uncertainty component would be combined RSS with the gauge mode uncertainty of the instrument A 6 APPENDIX A APPENDIX B SUMMARY OF ERROR MESSAGES Negative error numbers are from the Standard Commands for Programmable Instruments Version 1991 0 103 104 2109 2110 113 Al 221 Settings Conflict The command could not be executed due to the current state of the PPI Some commands cannot be executed while a program self test or calibration is in progress 222 Out of Range The value is not within the valid range For pressures check high and low limits 281 Cannot create program Program memory is full 282 Illegal Program Name The name specified is not valid or does not exist 284 Program Currently Running The command cannot be executed while a program 15 running 285 Program Syntax Error The syntax of the program definition is not correct 286 Program Runtime Error An error occurred while running the program Usually the setpoint is out of range 313 Calibration Data Lost The calibration data has been lost and the unit must be recalibrated 315 Configuration Data Lost The configurat
86. scale ranges 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 deadband into the process Mercury Free All components in the PPI are mercury free NIST Traceability All PPI s are calibrated per ANSI NCSL Z 540 1 1994 using Ruska deadweight gauges that are directly traceable to the National Institute of Standards and Technology NIST Universal Power Supply The PPl s universal power supply accepts AC voltages between 90 and 260 volts and DC voltages between 100 and 370 volts To reconfigure the PPI for use in another country the user simply changes the power cord Friendly Display The PPI s color active matrix TFT display combines a bright low glare readout 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 PPI easy to use Frequently used selections such as the units of measure are restored to memory each time the PPI powers up Modular Design The sensing element pneumatics electronics and user
87. stat 0 cprintf Out of Range ys else if pstat gt 0 cprintf Unstable 2d seconds pstat gotoxy 20 6 if tstat 0 cprintf Stable else if tstat 0 cprintf Out of Range else if tstat 0 cprintf Unstable 2d minutes tstat gotoxy 20 7 if rstat 0 cprintf Stable 5 13 REMOTE OPERATION else if rstat 0 cprintf Out of Range rstat else if rstat 0 cprintf Unstable 2d seconds while pstat 0 tstat 0 rstat 0 Sto iia i Le Pu Start Zero Adjust CAL ZERO RUN AA AA ee EAE write 7000 CAL ZERO RUN n A PA CERE UPS ea RUP Wait for zero to complete En STAT OPER COND i Lec ueeI IIIA f LAIT do request 7000 STAT OPER COND Nn sscanf buffer Sd amp status if check errors return 0 gotoxy 1 9 cprintf Zeroing while status amp 1 0 gotoxy 1 9 cprintf Zero Complete return 1 PRU a UNE Ra a e S a check errors display all GPIB and 7250 error messages return TRUE if any errors were found a a A a Ae A TCU TUNES LE A A e rnt check errors void unsigned char status7 int retval A la E E ee ee x Check for GPIB Interface Errors Vacca pue isdem aE OR x if ibsta amp ERR 5 14 REMOTE OPERATION cprintf GPIB Status 4X Error d r n ibsta iberr return 1
88. te is positive it will be used at the maximum rate with the overshoot set to low If the rate is zero then the maximum rote will be used with the overshoot set to low If the rate is negative the maximum rate will be used with the overshoot set to normal Units Unit Number Unit Name Ruska display units 1 Pa kPa 2 kPa kPa 3 Mpa kPa 4 mbar bar 5 bar bar 6 kg cm2 kg cm 7 kg m2 kg cm 8 mmHg mmHg 0 C 9 cmHg cmHg 0 C 10 mHg cmHg 0 C 11 mmH20 cmH5O 4 C 12 cmH20 cmH5O 4 C 13 mH20 cmH5 O 4 C 14 torr mmHg 0 C 15 atm bar 16 psi psi 17 Ib ft2 psi 18 inHg inHg 0 C 19 H2004 inH O 4 C 20 H2004 inH O 4 C 21 SPEC L User Defined 1 22 H2020 inH O 20 C 23 H2020 inH O 20 C 5 8 SAMPLE PROGRAMS 5 8 1 SAMPLE PROGRAM 2 7050 GPIB IEEE 488 ZERO SEQUENCE p wc x Sample Program 2 7050 GPIB IEEE 488 7 Ef Zero Sequenc Ey D AEN ROLE PNEU NEL 3 ROUES RO ERES x include lt stdio h gt include lt stdlib h gt include lt string h gt include lt conio h gt REMOTE OPERATION include decl h A III A 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 int zero void void write 7000 char s void request 7000 char s void main
89. th of the yellow line again loosen the Allen screw and now offset the yellow bar the 6 13 MAINTENANCE 14 15 6 6 same width that you observed it moving from tightening the Allen screw and now offset it in the opposite direction by this same width Again tighten the Allen screw Now the width of the yellow line should be minimized Tap on the bracket with a screwdriver handle to relieve mechanical stress Continue to tap on the bracket until the counts stop changing If the zero moved significantly as a result from tapping the bracket repeat this procedure as necessary Reinstall plastic zeroing plug After the unit has become thermally stabilized perform a normal instrument zeroing procedure Refer to Section 6 4 5 FIGURE 6 5 PHOTOCELL LOCATION FAN OPERATION The fan in the 7050 can be turned on or off It is recommended to keep the fan ON since this will extend the life of the power supply When operating the system in either a very cold or hot environment if the oven is unable to maintain the temperature of the internal oven it will generate error Oven Control Failure Error messages The operator can review the temperature and duty cycle of the oven by pressing the MENU DISPLAY keys The unit must have been warmed up for a minimum of 2 hours prior to determining the condition of the oven temperature control The temperature of the sensor should be contro
90. tiating the zeroing command in the PPI 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 200 mTorr preferably less than 100 mTorr in order to obtain a proper zero The PPI 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 PPI would also increase if zeroed at higher vacuum levels Once the vacuum level is stable the user enters the vacuum level as indicated by the vacuum gauge and then the zeroing procedure completes Please refer to the Maintenance Section Section 6 0 of the manual for more detailed information regarding the zeroing procedure of the PPI 4 12 LOCAL OPERATION 4 3 3 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 7050 Remote MENU TEST MENU MENU TEST SWEEP MENU 4 3 3 1 Menu Test Self Test The PPI can perform electrical and pneumatic self test to assist in trouble shooting potential problems Please refer to the Maintenance Section 6 0 for more details NOTE In order to perform a pneumatic self test the supply port must be connected to a properly set supply pressure and the test port not open to atmosphere For absolute units a vacuum supply must also be conn
91. unit name gt 5 4 5 EXAMPLE 5 COMMANDS Set Gas Medium 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 Reset Condition Flags Set System Date Returns lt error descr info gt Or 0 No Error Lock Keyboard Set System Time Returns 1991 0 Set Interface Protocol to 6000 or SCPI or Druck DPI 500 Reset System Perform Electronic Self Test Abort Pneumatic Self Test Define a Unit Set Length Units for Head Height Set Pressure Units Valid unit names are KPA BAR PSI KG CM2 INHGOC INHG60F CMH204C INH2O20C INH2O25C FT M KNOT KM HR MPA PA 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 zero the unit via the remote interface use the following sequence CAL ZERO INIT CAL ZERO INIT Enter Zero Mode Read Status Mode Pressure Temperature Reference and Wait Until Stable CAL ZERO RUN Start Zero Adjust Sequence REMOTE OPERATION STAT OPER COND Wait Until Complete Bit O 0 5 4 6 5 STATUS REGISTERS Three type of status registers are available Condition Event and Enable Condition registers always show the current status of the instrume
92. void char p le rm x Initialize GPIB Interface Pe eee A a x device ibdev 0 First GPIB Board 2 GPIB Address of 7250 NO SAD No secondary addressing TIS 1 Second Timeout 05 No automatic for transmit REOS LF Terminate read on Line Feed if ibsta amp ERR cprintf GPIB Driver not installed n return UNCTIO EPOR Zero 7010 HEN if zero ibonl device 0 return eco ee P OI SCOPE POI OT Reset GPIB Interface HL ae ise tas ibonl device 0 5 12 REMOTE OPERATION int zero void int cstat pstat tstat rstat yg cprintf Zeroing gotoxy 1 5 cprintf Pressure Reading gotoxy 1 6 cprintf Sensor Temperature gotoxy 1 7 cprintf Reference Pressure A a OPNS UD Enter Zero Mode 594 CAL ZERO INIT mU TM ECCE TO T MP MEE write 7000 CAL ZERO INIT n Se See 2203s Bas A eee A ES A a e P A ee Wait for calibration values to be within limits he CAL ZERO INIT ay A A A E LUE RII EI do if kbhit getch break request 7000 CAL ZERO INIT n sscanf buffer d d d d amp cstat amp pstat amp tstat amp rstat If check errors 77 return 0 gotoxy 20 5 if pstat 0 cprintf Stable ns else if p
93. y accepts the entered number or confirms a command Function Keys These are the six keys that run vertically beside the display The label shown in the display beside each key identifies their function These functions will change based on which screen you are operating For ease of communication throughout the manual we refer to these keys as F1 through F6 We consider the top key to be F1 and the bottom Rotary knob The rotary knob select a field for editing CANCEL PREVIOUS These keys are used to stop undo or exit the current operation The CANCEL key returns all edited fields on the current entry screen to their original values It also stops the current program sequence or calibration process PREVIOUS key exits the current menu and returns to the previous menu Figure 4 2 is a menu tree showing the relationship between all the menus in the system Refer to it for selections available under the menu To move to a lower menu press the function key with the correct label To move towards the main menu press the PREVIOUS key 4 1 LOCAL OPERATION Menu Enter Menu State Setup Enter Setup 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 Set date and time reset machine view so
94. y if the zeroing conditions are stable The zero calibration will not be accurate if OK F6 is pressed when conditions are unstable 1 2 Wait until the zero procedure finishes This may take several minutes When the PPI completes step 1 the calibration screen will appear 6 4 MAINTENANCE Wey 2 4 On High Pressure Models pressure must be removed from the test ro 47 port If zeroing an Absolute unit then the Test Port must be isolated S Step 2 2 1 To begin step 2 use the calibration standard to apply the various pressures that will be requested by the 7050 The number of pressure points required to calibrate the PPI will vary based on whether the PPI is a 7050 7050 7050LP and if it has a vacuum negative gauge option The screen will display a table noting the following information Step The pressure step in the calibration sequence Apply The pressure that the standard is to generate to the PPI Tolerance The tolerance about the apply value that can be generated by the standard and still accepted by the PPI Actual The actual pressure value that was generated by the standard when the point was accepted Adj FS Depicts the amount that the PPI 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 po
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