RUSKA 7250, 7250i, 7250xi & 7250LP Pressure Controller/Calibrator Users Manual PN 3952213 November 2010 © 2010 Fluke Corporation. All rights reserved. Printed in USA. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days.
7250 – Change Language Hold mode key for 5 seconds enter gkn001.
Table of Contents Chapter 1 Title Page General Information ............................................................................ 1-1 Introduction........................................................................................................ How to Contact Fluke ........................................................................................ Safety Information ............................................................................................. Safety Summary .............
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Standard Equipment and Options ...................................................................... 1-5 2 Theory of Operation ............................................................................ 2-1 Introduction........................................................................................................ Power Supply..................................................................................................... Electronics Module ...
Contents (continued) Vacuum Sensor—Option............................................................................... 3-5 4 Local Operation ................................................................................... 4-1 Introduction........................................................................................................ Numeric Keypad............................................................................................ Function Keys..........................................
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Remote/Local Operation.................................................................................... Configuration ..................................................................................................... Device Messages................................................................................................ SCPI Command Format ................................................................................ SCPI Response Format.......
Contents (continued) Cleaning ............................................................................................................. 6-19 7 Preparation for Storage & Shipping .................................................. 7-1 Introduction........................................................................................................ Disconnecting the RUSKA 7250 ....................................................................... Packing Instructions...................................
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List of Tables Table 1-1. 1-2. 2-1. 2-2. 3-1. 6-1. 6-2. 6-3. Title Symbols.................................................................................................................. RUSKA 7250 Options List .................................................................................... Conversion Factors................................................................................................. Solenoid Valves States .........................................................................
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List of Figures Figure 2-1. 2-2. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. 2-8. 3-1. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 4-10. 4-11. 4-12. 4-13. 4-14. 4-15. 4-16. 4-17. 4-18. 4-19. 4-20. 4-21. 4-22. 4-23. 4-24. Title Calibrator Block Diagram ...................................................................................... RUSKA 7250 Gauge Pneumatics Diagram............................................................ Model 7250 DPC Gauge Pneumatics Diagram, 5 to 2500 psig (34 kPa to 17.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 4-25. 4-26. 4-27. 4-28. 4-29. 6-1. 6-2. 6-3. 6-4. 6-5. 6-6. 6-7. 6-8. 6-9. 6-10. 6-11. 6-12. 7-1. Menu | Test | Sweep - Menu................................................................................... Menu | Test | Remote - GPIB Menu & Serial1 Menu ............................................ Menu | Test | Shop1 - Menu ................................................................................... Menu | Test | Controller - Menu ..................
Chapter 1 General Information Introduction This manual contains operation and routine and preventive maintenance instructions for the RUSKA 7250, 7250i, 7250xi and 7250LP Pressure Controller/Calibrator (Calibrator) manufactured by Fluke. The manual will refer to all model numbers of the instrument listed above generically as the Calibrator.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 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.
General Information General Information 1 Table 1-1. Symbols Symbol Description P This equipment meets the requirements of all relevant European safety directives. The equipment carries the CE mark. ! This symbol, on the instrument, indicates that the user should refer to the user manual. J W X ~ Earth Ground Important Information: refer to manual Shock Hazard Do not dispose of this product as unsorted municipal waste. Go to Fluke’s website for recycling information.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Universal Power Supply The Calibrators’s universal power supply accepts AC voltages between 100 – 120 VAC and 220 – 240 VAC. To “reconfigure” the Calibrator for use in another country, the user simply changes the power cord. Measure While Control The Calibrator simultaneously digitally displays the commanded pressure, the actual pressure, and the difference between the two.
General Information Standard Equipment and Options 1 Automatic Head Correction The Calibrator automatically corrects for head pressure between the Calibrator 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 Calibrator is not sensitive to the type of gas used within the system, the user can select either instrumentation air or nitrogen, allowing the Calibrator to automatically make pressure head corrections.
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Chapter 2 Theory of Operation Introduction The Calibrator’s power supply, electronics, pneumatics, and sensor combine to form a complete, stand-alone, measure and control instrument. This Chapter of the manual describes the Calibrator’s component modules and provides a general discussion of each.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Electronics Module Back-Plane Board The Back-plane Board is used to interconnect all of the plug-in electronic boards and distribute power. The Microprocessor Board, the Digital Control Board, and the IEEE-488 Interface all plug into the Back-plane Board. The Front Panel communicates with the Microprocessor Board via cables. The Sensor Board communicates with the Microprocessor board through an internal RS-485 serial communication bus.
Theory of Operation Electronics Module 2 Table 2-1. Conversion Factors Symbol Description Conversion Factor InHg inches of mercury (0°C) = kPa x 0.2952998 InHg inches of mercury (60 °F) = kPa x 0.296134 KPa KiloPascals = kPa x 1.0 Bar Bars = kPa x 0.01 Psi pounds per square inch = kPa x 0.1450377 cmH20 Centimeters of water (4°C) = kPa x 10.19744 inH20 4°C inches of water (4°C) = kPa x 4.014742 inH20 20°C inches of water (20°C) = kPa x 4.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Pneumatics Module The Calibrator’s Pneumatics Module varies depending on whether the Calibrator is a Gauge mode, Absolute mode, or a Simulated Absolute mode instrument. Gauge mode Calibrator’s reference their measurements to atmospheric pressure, whereas Absolute mode Calibrator measurements are made with respect to sealed vacuum. A Simulated Absolute mode Calibrator has a barometric sensor in addition to a gauge Bourdon tube sensor.
Theory of Operation Pneumatics Module REFERENCE PORT TEST PORT SUPPLY PRESSURE PORT 2 EXHAUST PORT BACKPANEL APPLY ISOLATION RELEASE ZERO INNER LOOP CONTROL SENSOR Control Section PRIMARY SENSOR V VACUUM SENSOR Option Figure 2-3. RUSKA 7250 Absolute Pneumatics Diagram to 50 PSIA (340 kPa) FS REFERENCE PORT TEST PORT SUPPLY PRESSURE PORT gkn004.eps EXHAUST PORT APPLY RELEASE VENT INNER LOOP CONTROL SENSOR Control Section PRIMARY SENSOR Figure 2-4.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Measure Mode Pneumatics Figures 2-2, 2-3 and 2-4 summarize the Pneumatics of the RUSKA 7250. 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 the Calibrator’s Measure and Control modes.
Theory of Operation Control Strategy 2 Vent Procedure The vent mode is implemented with a fast multi-step procedure. For gauge instruments, the Calibrator controls pressure at the maximum rate towards zero psig. When the primary sensor reads that the pressure is within 1% FS pressure of zero psig, the controller is turned off and the reference zeroing solenoid is opened, which vents the remaining test port pressure to atmosphere.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual The outer loop is a lower frequency response, analog-digital loop. The outer loop uses a calibrated, forced-balanced sensor. This sensor is used to monitor the pressure of the system. The results are used for the displayed pressure. The outer loop is responsible for adjusting the signal sent to the inner loop to compensate for temperature and time drifts associated with the inner loop sensor.
Theory of Operation 2 Pressure Transducer Module 0 5 10 15 20 25 Time - seconds Figure 2-5. Pressure Control gkn054.eps Transducer Module Quartz Bourdon Tube Sensor (Transducer01) 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 2-6. A rigid beam is attached transverse to the axis of the helical tube. Attached to both ends of this beam are electromagnetic coils.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual FUSED QUARTZ BOURDON TUBE AXIS OF ROTATION MIRROR TORSION HINGE ELECTROMAGNETIC COIL FLEXURE PERMANENT MAGNET Figure 2-6. Shaft/Magnet Section gkn008.
Theory of Operation Software 2 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, RUSKA 7250’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.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual thermally stable by viewing the Menu | Display screen and verifying that the temperature is at 50 oC. In addition to the temperature, this screen will show the duty cycle of the oven. When operating the system in either a very cold or hot environment, if the oven in unable to maintain the temperature of the internal oven, the Calibrator will generate an Oven Control Failure error messages.
Theory of Operation Software HsZ Hardware zero correction. (0 to 4095, center is 2048). SsZ Zero corrections scaling factor. Ratio of High FSR to Low FSR. Used only when Case Effect Coefficient or Oven Temperature Coefficient are non-zero. 2 s=0 for high range sensor, s=1 for low range sensor.
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Chapter 3 Installation Introduction This section of the manual discusses initial installation for the RUSKA 7250. Installing the Calibrator involves connecting the supply and test pressure tubing, powering up the unit, and configuring the system through the front panel. Unpacking the Calibrator Carefully unpack all components, checking for obvious signs of damage.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Table 3-1. General Specifications and Parameters Parameter Value Model Operating Humidity 5–95%RH, noncondensing all Storage Humidity none* all Operating Temperature 18 – 36°C all Storage Temperature -20 to 70°C all Electrical Power 100 – 120/220 – 240 VAC all Power Consumption 150 W all Warm-up Period < 3 hrs all *If there is any condensation when storing the Calibrator, it must be thoroughly dried before power is applied.
Installation Observing the Calibrator’s Full Scale Rating 3 Observing the Calibrator’s Full Scale Rating To observe the Calibrator’s full scale rating, 1. Press Previous until the Main Menu appears. 2. Select Menu | Test | Electrical. The Calibrator’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. Pneumatic Connections Pneumatic connection to the Calibrator is straightforward.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 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. Instruments with a low full-scale pressure range require special handling to assure the performance of the instrument. These instruments are very sensitive to atmospheric pressure changes including disturbances in the atmospheric pressure.
Installation Pneumatic Connections 3 POWER 85-265 VAC 50/60 HZ 150VA SUPPLY EXHAUST TEST REF NOTICE: FAN IS NORMALLY OFF. SEE USER'S MANUAL TO TURN ON. Figure 3-1. RUSKA 7250 Back Panel gkn010.eps Vacuum Sensor—Option The RUSKA 7250 is also available with a vacuum sensor option. On a permanent absolute instrument, this sensor is used to zero the RUSKA quartz sensor at a high vacuum.
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Chapter 4 Local Operation Introduction This section of the manual describes operation of the RUSKA 7250 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. 7250 Figure 4-1. RUSKA 7250 Front Panel gkn011.eps Numeric Keypad This includes the number keys, the decimal point [.], and the change sign key [-].
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 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. The PREVIOUS key exits the current menu and returns to the previous menu.
Local Operation Tutorial 4 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. In the Main Menu screen, the [F2] key places the unit in Control mode, ENTER must be pressed to actually enter the Control mode. The [F3] key places the unit in Vent mode.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Figure 4-4. Units Menu gkn015.bmp 2. Use the rotary knob located to the right of the display to move the highlight bar to the desired unit. Note The highlighted curser initially shows the current unit of measure. When the rotary knob is moved, the current unit remains highlighted in a gray color, and the new unit is highlighted in a light blue color. 3.
Local Operation Tutorial 4 will appear below the scratch pad. Notice that the upper left corner still shows MEASURE. The Calibrator stays in Measure mode until the change is confirmed. Figure 4-6. Control Mode in Main Menu gkn017.bmp 7. Press ENTER to confirm the mode change. The upper left corner will change to CONTROL, and the pressure will start moving towards the set-point. 8. After the pressure is stabilized, assure that the word Step is highlighted in the Step/Jog [F5].
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Simulated Absolute Instruments This RUSKA 7250 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 Calibrator 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].
Local Operation Controlling Pressure Figure 4-8. Functions in Main Menu 4 gkn019.bmp Note For Calibrators with pressure ranges greater than 100 psi (700 kPa), the supply pressure port must be plugged or connected to a properly set pressure supply in order to measure pressure greater than 100 psi (700 kPa). Controlling Pressure The Control [F2] function key is used to place the Calibrator into the Control Mode.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Vent The Vent [F3] function is used to rapidly vent the pressure in the system to atmosphere. This system does not have a designated internal vent valve. Instead, the vent mode is implemented with a fast multi-step procedure. For gauge instruments, the Calibrator controls pressure at the maximum rate towards zero psig.
Local Operation Menu Figure 4-9. Configurations in Menu 4 gkn020.bmp 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. Figure 4-10. Menu l Setup - Menu gkn040.bmp 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.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Figure 4-11. Menu l Setup l Limits - Menu gkn021.bmp 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 Calibrator will then prevent the pressure from exceeding the high limit.
Local Operation Menu 4 the system due to thermal effects. However these thermal effects will stabilize over time. Once the system has thermally stabilized, pressure measurements can be made in the system without any “pressure noise” injected into the system as a result of having an Active controller in the system. The result would be that the controller would not add any additional uncertainty to the pressure measurement since it would be inactive during the measurement process.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 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 Calibrator will change from the control mode to the measure mode and it will generate an error message to the operator. Access The test access password allows the user to protect access to the RUSKA 7250’s configuration and programs.
Local Operation Menu 4 Ready Tolerance A Ready indication is generated when in control mode and the measured pressure is reading within this ready tolerance value. When running an internal program, the ready indicator is shown when the measured pressure is within the tolerance stored in the program. Gas Head Pressure Correction The term “head height” refers to the vertical distance between the sensing element in the device under test and the Calibrator’s pressure reference plane.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Key Click The RUSKA 7250 can be configured to emit a “clicking” sound each time a key is pressed. 1. The key “click” is set from the Menu | Setup | User. From the Main Menu (press Previous until the Main Menu appears), press Menu [F6] | Setup [F2] | 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.
Local Operation Menu Figure 4-14. Menu | Setup | Units | Edit Name - Menu 4 gkn024.bmp Use the < [F4] or > [F5] key to highlight the desired character in the matrix. a. Use the rotary knob to change the character. b. Repeat steps a and b until the desired name is entered. Press the Clear key to start over. c. 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.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 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 RUSKA 7250 will emulate the RUSKA 7010 and 7215 Series Controllers.
Local Operation Menu 4 Menu | Calibrate The Menu | Calibrate command is used to perform the calibrations on all of the sensors utilized by the RUSKA 7250. The RUSKA 7250 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.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual vacuum sensors tend to increase at higher vacuum levels, therefore, the uncertainty in the Calibrator 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. Refer to Chapter 6, Maintenance, of the manual for more detailed information regarding the zeroing procedure of the Calibrator.
Local Operation Menu 4 MaxTime The max time is the maximum time in seconds, including the dwell time, that the Calibrator can spend on one step of the program. After the max time elapses, the Calibrator will automatically proceed to the next set-point in the program, even if the current set-point has not been achieved. Thus, the max time selection limits the amount of time that the Calibrator can spend on any one set-point. Typically the max time should be set to a value greater than the dwell time.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Figure 4-18. Menu | Program | Edit - Menu gkn028.bmp 5. Using the numeric keypad, enter the values for Pressure, Tolerance, Dwell time, and Max time, pressing ENTER after each value. The rotary knob may be used to skip fields. 6. At the 0 step, enter the next pressure and the Calibrator will automatically insert a new pressure step. 7. Repeat steps 5 and 6 until the test sequence is complete.
Local Operation Menu Figure 4-19. Menu | Program | Edit | Auto - Menu 4 gkn029.bmp 6. Using the numeric keypad, enter the values for Start, Stop, Tolerance, Dwell time, Max time, number of pressure Points up, and number of pressure Points down, pressing ENTER after each value. The rotary knob may be used to skip fields. 7. Press Program [F1]. The program will be generated and the display will show the first step. 8. Press the Name [F6] key to edit the name of the program.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 5. Use the < [F4] and > [F5] keys to highlight a character. 6. Turn the rotary knob to select the character from the character set. 7. To correct a mistake, press Clear [F4] and return to step 5. 8. Repeat steps 5 and 6 until the name is complete. 9. Press Done [F6] to store the contents of the scratchpad as the new name of the program. Changing an Existing Program Instructions for changing an existing sequence are given below.
Local Operation Menu 4 3. Press Config [F3]. The configuration screen will appear. 4. Press Recall [F2]. The Calibrator will be set to the configuration stored with the program. Figure 4-22. Menu | Program | Config - Menu gkn032.bmp 5. Press PREVIOUS until the Main Menu appears. 6. Press Setup [F2] | Limits [F1]. Change the desired parameters using the normal procedures. 7. Return to the Main Menu by pressing PREVIOUS three times. 8. Press Menu [F6] | Program [F4]. 9.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Figure 4-23. Menu l Program l Run - Menu gkn033.bmp 4. Press Run [F2]. The configuration of the RUSKA 7250 stored with the program is restored, the pressure set-point is set to the pressure value in the first step, and the Calibrator is placed in Control mode. “Run” will now be highlighted and the program will proceed through its steps. 5. To pause the program, press Pause [F3].
Local Operation Menu 4 Menu | Test—Sweep Test The sweep function can be used to automatically exercise the elastic sensing element of the device under test prior to performing a calibration. For the RUSKA 7250 to perform the sweep test, input the high and low set-point pressures, the pressure control tolerance, the dwell time at set-point, and the number of cycles to perform. 1. Ensure that the units, limits, and control parameters are set to their desired values. 2.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 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.
Local Operation Menu Figure 4-28. Menu | Test | Controller - Menu 4 gkn038.bmp Menu | Display The Menu | Display is used to conveniently monitor most of the sensor output parameters. It is primarily used for troubleshooting. Figure 4-29. Menu l Display - Menu gkn039.bmp Menu | Display—Blank Menu | Display—Blank is used as a screen saver in the 7250.
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Chapter 5 Remote Operation Capabilities The RUSKA 7250 can be operated remotely by a computer. Two interfaces are supported: IEEE-488 and RS-232. Both interfaces support SCPI (Standard Commands for Programmable Instruments). The IEEE-488 interface additionally supports emulation of a RUSKA Single Channel Interface Panel (Models 6005-701 and 6005-761). The IEEE488 interface conforms to the following standards: ANSI/IEEE Std 488.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual RS-232 The RS-232 interface supports standard serial operation from a computer to a single RUSKA 7250. RS-232 supports the IEEE-488.2 and SCPI commands. The RUSKA 7250 allows the following port setups: Baud Rate Data Bits Parity Stop Bits Handshaking 1200, 2400, 9600, or 19200 7 or 8 Even, Odd, or None 1 or 2 XON/XOFF The RS-232 connection is a DB-9P connector found on the back panel of the RUSKA 7250. It is located on the processor board.
Remote Operation Device Messages 5 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] | Setup [F2] | 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. 4.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual ANSI/IEEE 488.
Remote Operation Device Messages 5 :DATE? Last zero date :TIME? Last zero time :PRESsure2 Case reference sensor :VALue Perform calibration point :DATA :POINts? Number of calibration constants :VALue? returns cal.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual :ON :OVERshoot ON|OFF|1|0 LIST :PRESsure [,] :POINts? :DWEL1[,] :POINts? :TOLerance[,] :POINts? :DIRection UP|DOWN :COUNt STATus :OPERation [:EVENT]? :CONDition? :ENABle :QUEStionable [:EVENT]? :CONDition? :ENABle :PRESet SYSTem :DATE ,, :ERRor? Set control on band Set Overshoot Mode Set List of Pressure Values Returns Number of Points Defined Specifies Dwell
Remote Operation Device Messages 5 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 STAT:OPER:COND? Wait Until Complete (Bit 0 = 0) SCPI Status Registers Three types of status registers are available: Condition, Event, and Enable. Condition registers always show the current status of the instrument.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Standard Event Status Register (ESR), Standard Event Status Enable Register (ESE) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Power-on. Set at power-up. Reserved 0. Command error. Error in command syntax. Execution error. Error in command execution. Device dependent error. Device error independent of commands. Query error. Output queue empty when request received. Reserved. 0. Operation complete. Set for *OPC command.
Remote Operation 6005 Interface Panel Emulation 5 6005 Interface Panel Emulation The RUSKA 7250 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 RUSKA 7250 emulation has the following differences: 1. The Calibrator is always in Remote mode (Byte 1, Bit 1). 2. All TI strip outputs must be written as OFF. 3. No special functions are implemented. 4.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual R0 R1,R2 S0,S1,S2,S3 T0 T1 U1 to U23 V W /0 to /11 *0 to *11 @0 @1 Unlock keyboard Lock keyboard Set pre-programmed units Turn off Tare mode Turn on tare mode to value set to B (B must be set first) Set S4 units (if S4 is selected this will change current units immediately) Set slew rate (sets low overshoot mode) Set In Limit wait time Set set-point as fraction of P value Set pre-programmed set-point Disable error reporting Enable error reporti
Remote Operation Sample Programs 5 Units Unit Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Unit Name RUSKA display units Pa kPa Mpa mbar bar kg/cm2 kg/m2 mmHg cmHg mHg mmH2O cmH2O mH2O torr atm psi lb/ft2 inHg "H2O04 'H2O04 SPEC'L "H2O20 'H2O20 kPa kPa kPa bar bar kg/cm2 kg/cm2 mmHg 0oC cmHg 0oC cmHg 0oC cmH2O 4oC cmH2O 4oC cmH2O 4oC mmHg 0oC bar psi psi inHg 0oC inH2O 4oC InH2O 4oC User Defined 1 inH2O 20oC inH2O 20oC Sample Programs Sample Program 1 - 7250 GPIB (IEEE-488) Con
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 4, /* GPIB Address of 7010 */ NO_SAD, /* No secondary addressing */ T1s, /* 1 Second Timeout */ 0, /* No automatic EOI for transmit */ REOS+LF); /* Terminate read on Line Feed */ if (ibsta & ERR) { printf ("GPIB Driver not installed.\n"); return; } /*-----------------------------------------------------------*/ /* Initialize 7250 Interface */ /* */ /* UNIT %FS Set units to percent of full scale */ /* PRES 20.0 Set control setpoint to 20 %FS */ /* PRES:TOL 0.
Remote Operation Sample Programs 5 /*---------------------------------*/ /* Check for GPIB Interface Errors */ /*---------------------------------*/ if (ibsta & ERR) { printf ("GPIB Status=%4X Error=%d\n"); return 1; } /*-----------------------*/ /* Check for 7250 Errors */ /*-----------------------*/ retval = 0; while (!kbhit ( )) { ibrsp (device, &status7); if ((status7 & 4) == 0) break; retval = 1; request_7000 ("SYST:ERR?\n"); printf (buffer); } return retval; /* Serial poll */ /* Check error bit */
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual device = ibdev (0, /* First GPIB Board */ 4, /* GPIB Address of 7250 */ NO_SAD, /* No secondary addressing */ T1s, /* 1 Second Timeout */ 0, /* No automatic EOI for transmit */ REOS+LF); /* Terminate read on Line Feed */ if (ibsta & ERR) { cprintf ("GPIB Driver not installed.
Remote Operation Sample Programs 5 gotoxy (20, 7); if (rstat == 0) cprintf ("Stable"); else if (rstat < 0) cprintf ("Out of Range"); else if (rstat > 0) cprintf ("Unstable (%2d seconds)", rstat); } while (pstat != 0 || tstat != 0 || rstat != 0); /*-------------------*/ /* Start Zero Adjust */ /* CAL:ZERO:RUN */ /*-------------------*/ write_7000 ("CAL:ZERO:RUN\n"); /*---------------------------*/ /* Wait for zero to complete */ /* STAT:OPER:COND? */ /*---------------------------*/ do { request_7000 ("STAT
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual ibwrt (device, s, strlen (s)); } /*--------------------------------------------------------------------*/ /* request_7000 : write a query command and read the response */ /*--------------------------------------------------------------------*/ void request_7000 (char *s) { ibwrt (device, s, strlen (s)); ibrd (device, buffer, sizeof (buffer)); } /*--------------------------------------------------------------------*/ Sample Program 3 - 7250 Serial (RS-232) C
Remote Operation Sample Programs 5 /* PRES:TOL 0.001 Set control tolerance to 0.001 %FS */ /* OUTP:MODE CONTROL Enter control mode */ /*-----------------------------------------------------------*/ write_7000_serial ("UNIT %FS;:PRES 20.0;TOL 0.001;:OUTP:MODE CONTROL\n"); if (check_errors ( )) { serial_close ( ); return; } /*-------------------------------------------------*/ /* Read pressure status until setpoint is reached.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual } /*--------------------------------------------------------------------*/ /* serial_int : receive interrupt for serial port */ /*--------------------------------------------------------------------*/ void interrupt serial_int ( ) { char ch; if ((inportb (portbase + 2) & 0x07) == 0x04) { ch = inportb (portbase); if (ch == XON) transmit_enabled = TRUE; else if (ch == XOFF) transmit_enabled = FALSE; else { inqueue[inq_in++] = ch; if (inq_in == QUEUE_SIZE) inq_i
Remote Operation Sample Programs 5 ; outportb (portbase, ch); } /*--------------------------------------------------------------------*/ /* write_7000_serial : write a string to the correct 7250 */ /*--------------------------------------------------------------------*/ void write_7000_serial (char *s) { if (address == -1) serial_write (CLEAR); /* Disable Addressing */ else { serial_write (DLE); /* Enable Addressing */ serial_write (address + 0x20); /* Address */ } while (*s) /* Write string */ serial_wri
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 5-20
Chapter 6 Maintenance Introduction Very little maintenance is required for the RUSKA 7250. This section of the manual discusses suggested maintenance procedures. Observing the Software Version Number Follow the steps below to observe the RUSKA 7250’s software version number. 1. If necessary, press PREVIOUS] several times to return the display to the Main Menu. 2. Select Menu | Setup | System. The software version number will appear on the screen. 3. Press PREVIOUS to return to the previous screen.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 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. Table 6-1.
Maintenance Calibration 6 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 switch. When the vacuum pump is turned on, the solenoid valve is energized and closes allowing the pump to operate normally.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Note The uncertainty of the final calibration must include the uncertainty of the pressure standard being used. Preparation 1. Verify that the Calibrator’s Reference Port is open to atmosphere for gauge calibrations and that the calibration standard is connected to the Test Port. 2.
Maintenance Calibration 6 Step 1 1. The zero procedure will start when the reading is in-range and stable or when OK [F6] is pressed. Press OK [F6] only if the zeroing conditions are stable. The zero calibration will not be accurate if OK [F6] is pressed when conditions are unstable. 2. Wait until the zero procedure finishes. This may take several minutes. When the Calibrator completes step 1, the calibration screen will appear.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 3. Using your calibration standard, generate the pressure shown in the Apply column. When the measured pressure stabilizes, use the Calibrator’s numeric keypad to enter the actual pressure applied by the calibration standard and then press ENTER. Do not enter the measured pressure reported by the Calibrator. If necessary, use the CLEAR key to correct a mistake in the edit field.
Maintenance Calibration 6 Vacuum (Negative Gauge) Calibrations Vacuum mode is an available option. The following configuration should be used when calibrating in the Vacuum mode. METERING VALVE CUTOFF VALVE TEST REFERENCE DEADWEIGHT GAUGE DPC PRESSURE CONTROLLER REF VACUUM INLET EXHAUST SYSTEM PRESSURE AND VACUUM Figure 6-3. Vacuum Calibration gkn042.eps To calibrate in Vacuum mode with the configuration shown in Figure 6-3, the following actions should be taken.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 3. If desired, change the Calibrator’s units of measure (see Chapter 4) to match those of the calibration standard. 4. To access the Calibration screen, from the Main Menu, select MENU | CALIBRATE. 5. Select the atmospheric sensor by pressing the Sensor [F6] key until the words Atmospheric Sensor are displayed above the calibration coefficients. 6. To begin the calibration process, press CALIBRATE.
Maintenance Calibration 6 7. You will use the calibration standard to apply the two vacuum points on the vacuum sensor. 8. 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 50 to 350 mtorr absolute. The selected pressures should be spaced as far apart as possible within the allowable range. 9. Generate the first pressure.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 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 RUSKA 7250’s 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.
Maintenance Calibration Figure 6-4. Zeroing Menu 6 gkn043.bmp 4. Do not disturb the instrument while zeroing is in process. 5. Wait for the zeroing procedure to finish. Figure 6-5. Zero Set gkn044.bmp 6. Press PREVIOUS to return to the Main Menu. Permanent Absolute Instruments This section details how to set up Permanent Absolute Instruments or Absolute with Evacuated Reference option. A vacuum pump must be connected to the reference port.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 3. Select Zero [F1]. Do NOT press the Calibrate button. When initiating the zeroing command in the Calibrator, 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.
Maintenance Sensor Photocell Zeroing 6 3. Enter the Zeroing screen by selecting MENU | CALIBRATE. 4. Select the Primary sensor by pressing the Sensor [F6] key until the word Primary is displayed above the calibration coefficients. 5. Select Zero [F1]. Do NOT press the Calibrate button. 6. Select the Mechanical Zero [F1] key. Figure 6-6. Photocell Zeroing Menu gkn045.bmp 7.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Figure 6-8. Correct Adjustment of Photocell Centering Bar gkn047.bmp 9. Tighten the Allen screw. 10. Often, when the Allen screw is tightened, the zero will move. Review the width of the yellow line, again loosen the Allen screw, and now offset the yellow bar the same width that you observed it moving from tightening the Allen screw, and now offset it in the opposite direction by this same width. 11. Again, tighten the Allen screw.
Maintenance Optimizing Control 6 Optimizing Control The performance of the controller may be optimized for certain environments or performance criteria by adjusting the values available in the Control screen. The Control screen is available from the Main Menu by pressing Menu [F6] | Test [F5] | Control [F6]. The Control screen is shown below. Figure 6-10. Menu | Test | Control - Menu gkn050.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Note Prior to performing any Auto-Tune functions in an effort to improve the controller performance, confirm that the system is a leak free system and the volume attached to the test port is within the recommended range (see Appendix A). Additionally, assure that the system has adequate pressure and vacuum supply (when required).
Maintenance System Software Update Procedure 6 should indicate a sensor temperature of 50 oC 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 (>90%) 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.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual RUSKA 7250 Controller Software Upgrade In addition to the main code, the RUSKA 7250 includes code for the pressure controller. The controller software version can be viewed by pressing the MENU | TEST | REMOTE | SERIAL2 keys. The controller software version is displayed next to “Ctrl”. This code can be upgraded through the RS-232 port on most units. Press the MENU | TEST | CONTROL key and check for “Download Yes”. If “Download...
Maintenance Cleaning 6 Table 6-3.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual 6-20
Chapter 7 Preparation for Storage & Shipping Introduction W Caution The procedures given in this Chapter must be strictly adhered to in order to prevent damage to the instrument. Failure to follow these procedures will likely result in damage to the RUSKA 7250 during shipment. This damage is not covered by the carrier’s insurance. Disconnecting the RUSKA 7250 1. Relieve all pneumatic pressure from the Calibrator. 2. Turn the Calibrator power switch to the Off position. 3.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Fluke has found that corrugated cardboard boxes provide the best packaging exterior. The box must have an impact rating of 275 lb and be of double-walled construction. This type of box will sustain most types of damages incurred during the shipping and handling process, but ensures that the contents remain intact and damage-free.
Preparation for Storage & Shipping Packing Instructions 7 8. Label the carton with the following labels: THIS SIDE UP, HANDLE WITH CARE, DO NOT DROP, and FRAGILE. (If the original Fluke shipping carton is utilized for this shipment, the above markings are preprinted on the carton.) Figure 7-1. Packing the RUSKA 7250 gkn049.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Shipping Instructions Fluke recommends using air freight for transportation. Surface transportation subjects the shipment to more frequent handling and much more intense shock. In most cases, if surface transportation is the mode of transport employed, handling damage is likely. Again, it is essential that the procedures mentioned in this Chapter be strictly adhered to in order to prevent any shipping and handling damage to the instrument.
Appendix A Summary of Specifications Uncertainty Analysis To perform an Uncertainty Analysis on a measurement device, you must be able to identify all of the parameters that influence the measurement. You must be able to quantify the magnitude of the potential error source and combine these into an overall uncertainty statement. To determine the expanded uncertainty on any manufacturers pressure Transfer Standard (TS), you must identify the following four primary influences; 1.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Long Term Stability Long term stability defines how the instrument drifts with time. This specification can be utilized to define the calibration interval for the standard. Some manufacturers will provide more than one stability specification for their instrument based on different calibration time intervals.
Summary of Specifications Uncertainty Analysis A Combining the Uncertainty Components Combining the Uncertainty Components into an Expanded Uncertainty Statement means that once all of the uncertainty components are identified, they can be combined into an overall Expanded Uncertainty Statement for the instrument.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual The following two tables are uncertainty analysis examples for a RUSKA 7250xi based on a three month and a yearly calibration. Table A-1. Uncertainty Analysis for RUSKA 7250xi—Three Month Analysis Uncertainty Analysis – 3 Month Calibration Interval Uncertainty RUSKA 7250xi from 25 to 100% of Range (2 sigma) A. Performance – (Linearity, Hysteresis, Repeatability and Temperature) 0.005% of Reading B. Stability – (3 months) 0.
Summary of Specifications Uncertainty Analysis A The following two tables are uncertainty analysis examples for a single range RUSKA 7250 based on a three month and a yearly calibration. Table A-3. Uncertainty Analysis for RUSKA 7250—Three Month Analysis Uncertainty Analysis – 3 Month Calibration Interval Uncertainty RUSKA Model 7250 (2 sigma) A. Performance – (Linearity, Hysteresis, Repeatability and Temperature) 0.003% of Full Scale B. Stability – (3 months) 0.0019% of Reading per 90 days C.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Specifications General Specifications Pressure Range: Minimum; 0 to 5 (0 to 700 mbar) Maximum; 0 to 3000 psi (0 to 200 bar) Display: 6.
Summary of Specifications Specifications A Performance Table A-5. Performance Specifications: RUSKA 7250 Pressure Range 5–1000 psi 1000–2500 psi 15–50 psi 3000 psi (0.34–68.9 bar) (68.9–172 bar) (1–3.45 bar) (210 bar) Gauge Gauge Absolute Gauge Mode Precision2 0.003% FS 0.003% FS 0.003% FS 0.01% FS Stability Over 3 Months: 0.0019% RDG/ 3 months Over 1 Year: 0.0075% RDG/year 0.01% FS Zero Drift4 <0.004%FS / 24hrs <0.004%FS / 24hrs <0.004%FS / 24hrs <0.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual MODEL RUSKA 7250i RUSKA 7250xi MODE GAUGE GAUGE Precision1 From 25% to 100% FS: 0.005% RDG From 5% to 100%FS: 0.005% RDG Below 25%FS: 0.005% of 25%FS Below 5%FS: 0.005% of 5%FS Greater of 0.005% of 25%FS or 0.0075 psi (0.05 kPa) Greater of 0.005% of 5%FS or 0.00075 psi (0.005 kPa) Over 3 Months: 0.0019% RDG/ 3 months 0.0019% RDG/ 3 months Over 1 Year: 0.0075% RDG/year 0.0075% RDG/year Zero Drift2 <0.002%FS / 24hrs <0.001%FS / 24hrs 0.
Appendix B Summary of Error Messages Summary of Error Messages Negative error numbers are from the Standard Commands for Programmable Instruments (Version 1991.0). Table B-1. Summary of Error Messages Value 0 Description and Corrective Action No Error. -103 Invalid Separator. Check punctuation in the SCPI command. -104 Data Type. The type of parameter data is incorrect. -109 Missing Parameter. No valid parameter was found for the SCPI command. -110 Command Header. The command name is not valid.
RUSKA 7250, 7250i, 7250xi & 7250LP Users Manual Summary of Error Messages, cont. B-2 -315 Configuration Data Lost. The configuration data has been lost. Check all parameters to be sure they are correct. -330 Self-Test Failed. Check the display for the test that failed. -350 Queue Overflow. The error queue was full and messages were lost. -400 Query Error. A read request was received when there was nothing to read. 500 Controller Malfunction. Internal control failure. 501 High Limit Exceeded.
