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Fluke RUSKA 7252 User Manual

Fluke RUSKA 7252 User Manual

Dual channel digital pressure controller/calibrator
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RUSKA 7252
Dual Channel Digital Pressure Controller/Calibrator
Users Manual
PN 3952304
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.

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  • Page 1 RUSKA 7252 Dual Channel Digital Pressure Controller/Calibrator Users Manual PN 3952304 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.
  • Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.
  • Page 3 7252 –Change Language mode Hold key for 5 seconds enter...
  • Page 5 Chapter Title Page General Information ................1-1 Introduction.................... 1-1 How to Contact Fluke ................1-1 Safety Information ................. 1-1 Safety Summary ................1-1 Keep Away From Live Circuits ............1-2 Do Not Service or Adjust Alone ............1-2 Resuscitation ..................1-2 Electro Static Discharge Sensitive Parts ...........

  • Page 6: Table Of Contents

    RUSKA 7252 Users Manual Standard Equipment & Options ............. 1-5 Rack Mount Kit .................. 1-5 Additional Power Cords ..............1-5 Theory of Operation ................2-1 Introduction.................... 2-1 Power Supply ..................2-2 Electronics Module ................2-2 Back-Plane Board................2-2 Microprocessor Board ............... 2-2 Digital Control Board .................
  • Page 7 Contents (continued) Single Test Port Operation - Option ..........3-4 Reference Port .................. 3-4 Vacuum Sensor Option ..............3-5 Local Operation ................... 4-1 Local Operation ..................4-1 Numeric Keypad ................4-1 Function Keys..................4-1 Rotary knob ..................4-3 Cancel, Previous ................4-3 Dual Control Screen ................
  • Page 8 — Zero Sequence ................5-13 Sample Program 3 — RUSKA 7252 Serial (RS-232) — Controls Pressure to 20.000 %FS ..........5-16 Sample Program 4 — QBASIC Example for RUSKA 7252....5-20 Maintenance..................6-1 Introduction.................... 6-1 Observing the Software Version Number ..........6-1 Preventive Maintenance ................
  • Page 9 Contents (continued) Cleaning ....................6-21 Preparation for Storage and Shipment..........7-1 Introduction.................... 7-1 Disconnecting the Calibrator ..............7-1 Packing Instructions ................7-1 Shipping Instructions ................7-3 Appendices A Summary of Specifications .............. A-1 B Summary of Error Messages............B-1...
  • Page 10 RUSKA 7252 Users Manual...
  • Page 11 2-1. Conversion Factors ................... 2-3 2-2. Solenoid Valves States ................2-5 3-1. General Specifications and Parameters............ 3-2 6-1. Electronics Self Test.................. 6-2 6-2. RUSKA 7252 Calibrator - Parts List ............6-20 6-3. RUSKA 7252 Calibrator - Replacement Parts List ........6-21...
  • Page 12 RUSKA 7252 Users Manual viii...
  • Page 13 Title Page 2-1. DPC Block Diagram .................. 2-1 2-2. RUSKA 7252 Calibrator Gauge Pneumatics Diagram 0.36 to 2500 psig (2.5 kPa to 17.2 MPa) Full Scale Ranges ..........2-4 2-3. RUSKA 7252 Calibrator Absolute Pneumatics Diagram to 50 PSIA (340 kPa) FS ..................... 2-5 2-4.
  • Page 14 RUSKA 7252 Users Manual 4-27. Channel A: Menu | Test | Remote - GPIB Menu ........4-30 4-28. Channel A: Menu | Test | Shop1 - Menu ........... 4-30 4-29. Channel A: Menu | Test | Controller - Menu ..........4-31 4-30.
  • Page 15 Fluke. This section of the manual provides general information about the Calibrator and presents its features and options. How to Contact Fluke To order accessories, receive operating assistance, or get the location of the nearest Fluke distributor or Service Center, call: •...
  • Page 16 RUSKA 7252 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.
  • Page 17 It is also used to monitor barometric pressures, vacuum systems, and differential pressure devices. The RUSKA 7252 has two full scale pressure ranges and two pressure controllers integrated into one instrument. Features The following features are available on all RUSKA 7252 Calibrators.
  • Page 18 RUSKA 7252 Users Manual Universal Power Supply The Calibrator’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.

  • Page 19: Standard Equipment & Options

    Additional Power Cords Additional power cords are available for most countries. All options are summarized in Table 1-2. To order these items, please contact Fluke in the U.S. at (713) 975-0547. Table 1-2. RUSKA 7252 Calibrator - Options List Option...
  • Page 20 RUSKA 7252 Users Manual...

  • Page 21: Theory Of Operation

    This section of the manual describes the Calibrator’s component modules and provides a general discussion of each. The RUSKA 7252 has two pneumatic control and two primary transducer modules. Primary Transducer Module 2 Pneumatics Module 2...

  • Page 22: Power Supply

    RUSKA 7252 Users Manual Power Supply The Calibrator’s universal power supply accepts AC voltages from 100 – 120 VAC / 220 – 240 VAC at 50/60 Hz. This quad-output supply produces +5 VDC, +/-12 VDC, and 24 VDC which are distributed to the Control and Backplane Boards.

  • Page 23: Digital Control Board

    Theory of Operation Electronics Module Unless specified otherwise, conversion factors are based on ANSI 268-1982. 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 KiloPascals = kPa x 1.0 Bars...

  • Page 24: Pneumatics Module

    Control Section PRIMARY SENSOR VACUUM SENSOR Option glb03.eps Figure 2-2. RUSKA 7252 Calibrator Gauge Pneumatics Diagram 0.36 to 2500 psig (2.5 kPa to 17.2 MPa) Full Scale Ranges Note This diagram depicts only one of the two RUSKA 7252 channels.

  • Page 25: Measure Mode Pneumatics

    PRIMARY SENSOR VACUUM SENSOR Option glb04.eps Figure 2-3. RUSKA 7252 Calibrator Absolute Pneumatics Diagram to 50 PSIA (340 kPa) FS Note This diagram depicts only one of the two RUSKA 7252 channels. Table 2-2. Solenoid Valves States Valve Measure Mode...
  • Page 26 This sensor provides the barometric offset that allows the Gauge mode Calibrator to function in an Absolute system. A RUSKA 7252 must have a minimum full scale pressure range of 14.7 psig (101 kPa) in order to be configured to operate in the simulated absolute mode using the barometric reference sensor.

  • Page 27: Vent Procedure

    Pneumatics Module Single Test Port Operation - Option Some versions of the RUSKA 7252 allow the instrument to be set-up where the test port of both controllers are connected together. This can be permanently set at the factory or on units ordered with this option, a user selectable flag set in [MENU] Menu | Setup | System | Config, allows the system to operate in this mode.

  • Page 28: Pressure Control

    RUSKA 7252 Users Manual In Gauge mode, if the Calibrator will not be used to control pressures at or very near atmospheric pressure, then the Exhaust Port should simply be left open to atmosphere. Likewise, in Absolute mode, if the Calibrator will not be used to control pressures at or below atmospheric pressure, the same rule would apply.

  • Page 29: Alignment Of Inner Loop With Outer Loop

    This can cause control problems such as overshoot. This can be realigned using the Auto-Tune feature. See Chapter 6, Maintenance, for details on the Auto-Tune functions of the RUSKA 7252. PID Control The outer loop pressure controller is a form of PID control executed every 100 milliseconds (10 times per second).

  • Page 30: Transducer Module

    RUSKA 7252 Users Manual 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 2-5.

  • Page 31: Sensor Board

    Therefore, for the RUSKA 7252, a 5 point calibration is performed and for the RUSKA 7252i, a 9 point calibration is performed to fully characterize the RUSKA quartz sensors.

  • Page 32: Case Reference Vacuum Sensor - Option

    Menu | Menu | Display | Temp. With an exception of the 3000 psi (20.7 MPa) version RUSKA 7252, the high accuracy quartz sensor is housed in a temperature controlled oven. There is a 3 hour warm-up time required prior to the Calibrator operating at its optimum precision.

  • Page 33: Pressure Reading And Correction

    Theory of Operation Software 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%.

  • Page 34: Range Coefficients

    RUSKA 7252 Users Manual Range Coefficients 0=Range Unused 4=Valid High FSR Range 5=Valid Low FSR Range Kn0, Kn1, Kn2 Calibration constants for range Where is the zero corrected counts (7,381,975 = full scale of current range) is the calibrated counts (7,381,975 = full scale of current sensor) Zero corrected counts for upper limit of range.

  • Page 35: Installation

    Chapter 3 Installation Introduction This section of the manual discusses initial installation for the RUSKA 7252 Calibrator. Installing the Calibrator involves connecting the supply and test pressure tubing, powering up the unit, and configuring the system through the front panel.

  • Page 36: Cautions

    RUSKA 7252 Users Manual Table 3-1. General Specifications and Parameters Parameter Value Model Operating Humidity 5 % – 95 % RH, noncondensing Storage Humidity None Operating Temperature 18°C – 36 °C Storage Temperature -20 °C to 70°C Electrical Power 100 – 120 / 220 – 240 VAC...

  • Page 37: Observing The Calibrator's Full Scale Rating

    Make sure that you connect the proper pressure supply to the correct pressure channel. The pressure range for each channel is identified on the front panel of the RUSKA 7252. This is depicted using the letter A and B for the two channels and the pressure associated with these ranges.

  • Page 38: Test Port

    Single Test Port Operation - Option Some versions of the RUSKA 7252 allow the instrument to be set-up where the test port of both controllers are connected together. This can be permanently set at the factory or on units ordered with this option; a user selectable flag set in [MENU] Menu | Setup | System | Config allows the system to operate in this mode.

  • Page 39: Vacuum Sensor Option

    When operating in the absolute mode, sealing the reference port from atmosphere will improve the stability of the Calibrator. glb09.bmp Figure 3-1. RUSKA 7252 Back Panel Vacuum Sensor Option The Calibrator 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.
  • Page 40 RUSKA 7252 Users Manual...

  • Page 41: Local Operation

    Chapter 4 Local Operation Local Operation This section of the manual describes operation of the Calibrator 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.
  • Page 42 RUSKA 7252 Users Manual E n te r M e n u S ta te M e n u E n te r S e tu p M e n u S e tup C h a n g e b e tw e e n g a u g e a n d a b so lu te m o d e s o f o p e ra tio n M o d e S e t h ig h , lo w &...

  • Page 43: Rotary Knob

    Local Operation Dual Control Screen Rotary knob The rotary knob select a field for editing and are used for small pressure changes (pressure jog) at the main menu of the single display mode. 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.

  • Page 44: Tutorial

    RUSKA 7252 Users Manual Tutorial To begin the tutorial, first verify that the Calibrator is powered-up and that the pneumatic connections have been completed. The Calibrator should display a screen similar to the one shown above. (The right hand side of the display should show the options). At power up, there may be errors relating to the default settings.
  • Page 45 Local Operation Tutorial glb17.bmp & glb16.bmp Figure 4-5. Units - Menu 2. Use the rotary knob located to the right of the display to move the highlight bar to the desired unit. Note The highlighted curser initially shows the current unit of measure. When the rotary knob is moved, the current unit remains highlighted in a gray color, and the new unit is highlighted in a light blue color.

  • Page 46: Selecting Language

    Measure mode. No confirmation is necessary to leave Control mode. Selecting Language The RUSKA 7252 Calibrator can operate in a variety of different languages. To select a different language, press and hold the MODE key for 5 seconds. The current language will be highlighted.

  • Page 47: Barometric Reference Option

    (Gauge or Absolute). The Main Menu can always be reached by repeatedly pressing Previous. The RUSKA 7252 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.

  • Page 48: Controlling Pressure

    This function is not available on permanent absolute versions of the RUSKA 7252.

  • Page 49: Step/Jog

    Local Operation Step/Jog Step/Jog This feature is only available when operating in the single channel mode. In addition to entering the pressure set-point through the key-pad, the pressure set-point can be changed using either the step or the jog functions. The Step function is used primarily when the operator is taking pressure steps in equal pressure increments.

  • Page 50: Menu | Setup

    Setup is used to configure the system. It includes setting all of the limits, user parameters, user-defined units of measure, remote interface and system setup. On the RUSKA 7252, the User and Limits screens are separate for each channel and must be set up independently.

  • Page 51: Menu | Setup - Limits

    Local Operation Menu 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. All limits are defined separately for each channel. Press the Mode key to switch between two pressure channels.

  • Page 52: Control Band

    RUSKA 7252 Users Manual Control Band There are two common pressure control approaches that are available with the RUSKA 7252 Calibrator. One of the most common control styles is an Active controller where the controller remains operative and holds the pressure at a commanded set-point. This allows the system to hold the pressure at a set-point within the control stability specification (See Appendix A).

  • Page 53: Slew Rate

    Local Operation Menu Slew Rate User defined maximum pressure rate of change. The Calibrator is designed to control with minimum overshoot into a wide variety of external volumes at its highest slew rate. Therefore, in most applications it is recommended that the slew rate be set at its maximum rate value.
  • Page 54 6. Press Position [F4] to select if the position of the Device Under Test is either “Above”or “Below” the RUSKA 7252. The selected units will be highlighted and appear in the Gas Head description. 7. Use the rotary knob to highlight the label “Gas Head”.

  • Page 55: Menu | Setup - Units

    Local Operation Menu Atmosphere The nominal barometric pressure value for the location that the Calibrator 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 Calibrator and the DUT.
  • Page 56 RUSKA 7252 Users Manual glb26.bmp Figure 4-14. Channel A: 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] | Setup [F2] | Units [F3].
  • Page 57 The Protocol defines which protocol should be used by the remote interface. The options are Standard Communication for Programmable Instruments (SCPI) which is the only interface available for the RUSKA 7252. Serial Interface Set-Up The operator can set-up the Baud Rate, Data Bits, Parity, and Stop Bits for the Serial Interface.

  • Page 58: Menu | Setup - System

    RUSKA 7252 Users Manual Menu | Setup — System The System Menu identifies the Software release version that is being operated in the Calibrator. It also stores and allows the operator to edit the Date and Time. glb29.bmp Figure 4-17. Channel A: Menu | Setup | System - Menu Date/Time The Calibrator’s system clock is continuously updated.

  • Page 59: Menu | Calibrate

    (press Previous until the Main Menu appears), press Menu [F6] | Calibrate [F3]. 2. Press the Access [F4] key. If there is a password in the system other than 0, then you must enter the current valid password into the RUSKA 7252 before it will allow you to modify the password.

  • Page 60: Menu | Program - Storing A Sequence In Memory

    RUSKA 7252 Users Manual On permanent absolute instruments, a vacuum pump and vacuum gauge is required to zero the instrument. The optional vacuum gauge sensor is installed in a port that is located internally to the Calibrator very near to the RUSKA quartz sensor. 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.

  • Page 61: Entering A New Program

    Local Operation Menu Set-point Pressure and Tolerance Each set-point in the program requires both a pressure and a tolerance in the current units of measure. For example, one set-point might require a tolerance as low as 0.05 psi (0.35 kPa), whereas another set-point in the same program could be satisfied with a tolerance as high as 5 psi (0.35 kPa).
  • Page 62 RUSKA 7252 Users Manual 2. The program is entered from the Program Menu. From the Main Menu (press PREVIOUS until the Main Menu appears), press Menu [F6] | Program [F4]. glb30.bmp Figure 4-18. Channel A: Menu | Program - Menu 3.

  • Page 63: Automatically Generating A Program

    Local Operation Menu 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. The Tolerance, Dwell time, and Max time will default to the value programmed in the first program step, and only need to be changed if a different value is desired for a particular step.

  • Page 64: Changing The Name Of A Program

    RUSKA 7252 Users Manual 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.

  • Page 65: Changing An Existing Program

    Local Operation Menu Changing an Existing Program Instructions for changing an existing sequence are given below. Both manually and automatically generated programs may be edited. 1. Programs are changed from the Program Menu. From the Main Menu (press Previous until the Main Menu appears), press Menu [F6] | Program [F4]. 2.

  • Page 66: Changing The Configuration Stored With A Program

    RUSKA 7252 Users Manual Changing the Configuration Stored with a Program 1. Programs are configured from the Program Menu. From the Main Menu (press PREVIOUS until the Main Menu appears), press Menu [F6] | Program [F4]. 2. Use the rotary knob to highlight the name of the program.

  • Page 67: Running A Program

    Local Operation Menu Running a Program 1. Programs are run from the Program Menu. From the Main Menu (press PREVIOUS until the Main Menu appears), press Menu [F6] | Program [F4]. 2. Use the rotary knob to highlight the name of the program. 3.

  • Page 68: Menu | Test

    The Menu | Test section of the system is used to perform a number of the diagnostic and tuning functions that are available with the RUSKA 7252. The Sweep and Control test operate on the current selected channel. The other screens are independent of the selected channel.

  • Page 69: Menu | Test - Self Test

    Local Operation Menu glb38.bmp Figure 4-26. Channel A: Menu | Test | Sweep - Menu 4. Press Run [F2] to initiate the test. 5. To pause the program, press Pause [F3]. Pause will now be highlighted and the Calibrator will continue controlling to the current set-point. The Calibrator will maintain control of the current set-point until further instructions from the user.

  • Page 70: Menu | Test - Shop1

    RUSKA 7252 Users Manual 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. glb39.bmp Figure 4-27. Channel A: Menu | Test | Remote - GPIB Menu Menu | Test —...

  • Page 71: Menu | Test - Control

    It is primarily used for troubleshooting. This display screen shows all available sensor readings from both channels. glb42.bmp Figure 4-30. Channel A: Menu | Display - Menu Menu | Display — Blank This is used as a screen saver in the RUSKA 7252. 4-31...
  • Page 72 RUSKA 7252 Users Manual 4-32...

  • Page 73: Remote Operation

    Chapter 5 Remote Operation Capabilities The Calibrator 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 IEEE-488 interface conforms to the following standards: ANSI/IEEE Std 488.1-1987 IEEE Standard Digital Interface for Programmable...

  • Page 74: Remote/Local Operation

    RUSKA 7252 Users Manual RS-232 The RS-232 interface supports standard serial operation from a computer to a single Calibrator. RS-232 supports the IEEE-488.2 and SCPI commands. The Calibrator allows the following port setups: Baud Rate: 1200, 2400, 9600, or 19200...

  • Page 75: Configuration

    Remote Operation Configuration Configuration The remote interface must be configured before it is connected. The remote interface is configured using the local interface. The parameters needed vary with the interface used. IEEE-488 Address, Protocol RS-232 Baud Rate, Data Bits, Parity, Stop Bits To configure the remote interface: 1.

  • Page 76: Ansi/Ieee 488.2-1987 Command Summary

    MEAS:PRES would be sent to read the channel A pressure. To read the channel B pressure, the command MEAS:PRES11 would be used. When the RUSKA 7252 are configured as a “Single Test Port” instrument, the test ports of each channel are tied together. The instrument acts as a single range instrument to the operator since it internally switches between the two channels when controlling pressure.
  • Page 77 Remote Operation Device Messages :TEMPerature? A Gas Temperature :TEMPerature2? A Sensor Temperature :TEMPerature11? B Gas Temperature :TEMPerature12? B Sensor Temperature CALCulate [:PRESsure] :TARE :VALUE <number> get/set tare value :STATe ON|OFF set tare state using current press. :LIMit :LOWer <number> low pressure limit :SLEW <number>...
  • Page 78 RUSKA 7252 Users Manual :DATA :POINts? return number of calibration constants :VALue<n>? returns label,value (C0,0.123) :VALue<n> <number> sets calibration constant :CALibration :VALue<n>? return nominal calibration point :POINts? return number of calibration points :ZERO <number> Zero sensor :PRESsure3? RPT Sensor Same as PRESsure2 above...
  • Page 79 Remote Operation Device Messages :NAME <program name> select current program :STATe RUN|PAUSe|STOP|CONTinue change program state :CONFigure :RECall load program configuration :SAVE save current configuration into program SENSE [:PRESSure] [:RESolution] <number> sets pressure display resolution :AUTO ONCE returns to default resolution :MODE ABSolute|DIFFerential|GAUGE|TARE :RANGE [:UPPer]?
  • Page 80 RUSKA 7252 Users Manual :DWELl <number> [,<number>] specifies dwell times :POINts? number of dwell times :TOLerance <number> [,<number>] specifies tolerances :POINts? number of tolerances :DIRection UP|DOWN direction to go through list :COUNt <number> number of times to go through list...

  • Page 81: Example Scpi Commands

    Remote Operation Device Messages Example SCPI Commands To request the current pressure reading, all of the following commands are equivalent: :MEASURE:PRESSURE? :measure:pressure? :MeAsUrE:pReSsUrE? :meas:pres? :measure? :meas? MEAS? To set the control pressure setpoint to 50, all of the following commands are equivalent: SOURCE:PRESSURE:LEVEL:IMMEDIATE:AMPLITUDE 50 SOUR:PRES:LEV:IMM:AMPL 50.0 PRESSURE +50...
  • Page 82 RUSKA 7252 Users Manual 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.

  • Page 83: Serial Operation

    When addressing is disabled, the unit will respond to commands without being addressed. Sample Programs Sample Program 1 — RUSKA 7252 GPIB (IEEE-488) — Controls Pressure to 20.000 /*--------------------------------------------------------------------*/ Sample Program 1 - RUSKA 7252 GPIB (IEEE-488) Controls pressure to 20.000 %FS...
  • Page 84 /* Reset RUSKA 7252 to Measure mode OUTP:MODE MEASURE Enter Measure mode */ /*-------------------------------------------*/ write_7000 ("OUTP:MODE MEASURE\n"); check_errors ( ); /*----------------------*/ /* Reset GPIB Interface */ /*----------------------*/ ibonl (device, 0); /*--------------------------------------------------------------------*/ /* check_errors : display all GPIB and RUSKA 7252 error messages 5-12...

  • Page 85: Sample Program 2 - Ruska 7252 Gpib (Ieee-488) - Zero Sequence

    /*--------------------------------------------------------------------*/ void request_7000 (char *s) ibwrt (device, s, strlen (s)); ibrd (device, buffer, sizeof (buffer)); /*--------------------------------------------------------------------*/ Sample Program 2 — RUSKA 7252 GPIB (IEEE-488) — Zero Sequence /*--------------------------------------------------------------------*/ Sample Program 2 - RUSKA 7252 GPIB (IEEE-488) Zero Sequence /*--------------------------------------------------------------------*/ #include <stdio.h>...
  • Page 86 /*----------------------*/ /* Reset GPIB Interface */ /*----------------------*/ ibonl (device, 0); /*--------------------------------------------------------------------*/ /* Zero : perform zero adjust of RUSKA 7252 /*--------------------------------------------------------------------*/ int zero (void) int cstat, pstat, tstat, rstat; clrscr ( ); cprintf ("Zeroing"); gotoxy (1, 5); cprintf ("Pressure Reading");...
  • Page 87 ((status & 1) != 0); gotoxy (1, 9); cprintf ("Zero Complete"); return 1; /*--------------------------------------------------------------------*/ /* check_errors : display all GPIB and RUSKA 7252 error messages return TRUE if any errors were found /*--------------------------------------------------------------------*/ int check_errors (void) unsigned char status7;...

  • Page 88: Sample Program 3 - Ruska 7252 Serial (Rs-232)

    (char *s) ibwrt (device, s, strlen (s)); ibrd (device, buffer, sizeof (buffer)); /*--------------------------------------------------------------------*/ Sample Program 3 — RUSKA 7252 Serial (RS-232) — Controls Pressure to 20.000 /*--------------------------------------------------------------------*/ Sample Program 3 - RUSKA 7252 Serial (RS-232) Controls pressure to 20.000 %FS /*--------------------------------------------------------------------*/ #include <stdio.h>...
  • Page 89 ( ); /*------------------------*/ /* Reset Serial Interface */ /*------------------------*/ serial_close ( ); /*--------------------------------------------------------------------*/ /* check_errors : display all RUSKA 7252 error messages return TRUE if any errors were found /*--------------------------------------------------------------------*/ int check_errors (void) unsigned char status7; int retval; /*-----------------------*/...
  • Page 90 RUSKA 7252 Users Manual if ((status7 & 4) == 0) /* Check error bit */ break; retval = 1; request_7000_serial ("SYST:ERR?\n"); /* Get error message printf (buffer); return retval; /*--------------------------------------------------------------------*/ /* serial_int : receive interrupt for serial port /*--------------------------------------------------------------------*/ void interrupt serial_int ( ) char ch;...
  • Page 91 (char ch) while (!transmit_enabled) while ((inportb (portbase + 5) & 0x20) == 0) outportb (portbase, ch); /*--------------------------------------------------------------------*/ /* write_7000_serial : write a string to the correct RUSKA 7252 /*--------------------------------------------------------------------*/ void write_7000_serial (char *s) if (address == -1) serial_write (CLEAR);...

  • Page 92: Sample Program 4 - Qbasic Example For Ruska 7252

    RUSKA 7252 Users Manual Sample Program 4 — QBASIC Example for RUSKA 7252 REM $INCLUDE: 'C:\GPIB-PC\QBDECL.BAS' DIM READING AS STRING*30 CALL IBDEV(0,4,0,12,1,&H40A,R7010%) CALL IBCLR(R7010%) CALL IBWRT(R7010%,"MEAS?" + chr$(&H0A)) CALL IBRD(R7010%,READING$) PRINT READING$ CALL IBONL(R7010%,0) Note EOM & EOS are linefeed...

  • Page 93: Maintenance

    Chapter 6 Maintenance Introduction Very little maintenance is required for the Calibrator. This section of the manual discusses suggested maintenance procedures. Observing the Software Version Number Follow the steps below to observe the Calibrator’s software version number. 1. If necessary, press PREVIOUS several times to return the display to the Main Menu.

  • Page 94: Removing The Calibrator's Cover

    RUSKA 7252 Users Manual 3. Press Electrical [F1]. The electronics self test will run and display the results. The electronics test runs eight sets of tests on various parts of the electronic modules. Table 6-1 describes these tests and the possible actions needed if a test fails. The pneumatics test runs nine tests on the pneumatics module.

  • Page 95: Vacuum Pumps

    (Chapter 6, RPT Calibration – Simulated Absolutes)). Calibration Instructions To calibrate the RUSKA 7252, the user connects a calibration standard such as the RUSKA Instrument Model 2465 (or 2470 for high pressure ranges) Gas Piston Gauge to the Calibrator’s test port, then follows the multi-step calibration procedure on the Calibrator’s display.

  • Page 96: Preparation

    The sensors coefficients are then shown below the sensor label. On the RUSKA 7252, there are two primary sensors. The first sensor that is shown is the primary measuring sensor A. This is indicated by the word A Primary displayed in the top of the display.
  • Page 97 Calibrator. The number of pressure points required to calibrate the Calibrator will vary based on whether the Calibrator is a RUSKA 7252 or 7252i and if it has a vacuum (negative gauge) option. The screen will display a table noting the following information;...

  • Page 98: Storing The Coefficients

    RUSKA 7252 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.

  • Page 99: Vacuum (Negative Gauge) Calibrations

    Maintenance Calibration Vacuum (Negative Gauge) Calibrations Vacuum mode is an available option. The following configuration should be used when calibrating in the Vacuum mode. METERING VALVE REFERENCE TEST DEADWEIGH GAUGE PRESSURE CONTROLLER INLET REF VACUUM EXHAUST SYSTEM PRESSURE & VACUUM glb11.eps Figure 6-3.

  • Page 100: Rpt Calibration - Simulated Absolute

    The first calibration screen will appear. 7. You will use the calibration standard to apply the various pressures that will be requested by the RUSKA 7252. The screen will display a table noting the following information;...

  • Page 101: Vacuum Sensor Calibration - Optional Case Reference Sensor

    Note On the RUSKA 7252 each sensor will have its own independent vacuum sensor. 3. If desired, change the Calibrator’s units of measure (see Chapter 4) to match those of the calibration standard.

  • Page 102: Editing The Calibration Coefficients

    RUSKA 7252 Users Manual Editing the Calibration Coefficients If the Calibrator’s memory is erased but the calibration coefficients are known, the user can restore the coefficients to the Calibrator by following the directions below. W Caution Never randomly adjust the calibration coefficients. Only qualified personnel with valid backup data should be allowed to edit the coefficients.

  • Page 103: Zeroing

    Maintenance Calibration 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 procedure is to guarantee that there is not a pressure differential between the sensor’s test port and case reference.

  • Page 104: Absolute Instruments

    RUSKA 7252 Users Manual glb46.bmp Figure 6-5. Zeroing in Progress 6. Press PREVIOUS to return to the Main Menu. Absolute Instruments A high capacity vacuum pump must be connected to the rear reference port connector. Units that were purchased with the Vacuum Sensor option, have an internal vacuum sensor mounted internal to the primary sensor housing that monitors the vacuum level when the instrument is being zeroed in the absolute mode.

  • Page 105: Rpt - Instruments With The Barometric Reference Option

    Maintenance Sensor Photocell Zeroing RPT — Instruments with the Barometric Reference Option 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] MENU | CALIBRATE. 3.
  • Page 106 RUSKA 7252 Users Manual glb47.bmp Figure 6-6. ZeroSet Menu 7. Referring to Figure 6-9. slightly loosen the Allen screw on the back of the sensor bracket, making sure to maintain a snug fit on the screw. Using the T-shaped Photocell Centering Tool (part number 7250-111), adjust the photocells by placing the tool in the hole in the back of the sensor and turning the tool slightly.
  • Page 107 Maintenance Sensor Photocell Zeroing 7. 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. glb49.bmp Figure 6-8. Adjustment Bar Screen 8.

  • Page 108: Optimizing Control

    RUSKA 7252 Users Manual 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].
  • Page 109 There are three options available to the operator. Full This fully characterizes the control function of the RUSKA 7252. It automatically adjust the control valve biases and aligns the inner loop high control pressure sensor to the high accuracy quartz sensor. This should be performed any time major components are replaced in the controller such as the control valves or the high-speed inner loop control sensor.

  • Page 110: Fan Operation

    Auto-Tune should be run to characterize the new hardware. Fan Operation The fan in the RUSKA 7252 can be turned on or off. It is recommended to keep the fan ON since this will extend the life of the power supply.

  • Page 111: System Software Update Procedure

    Complete. RUSKA 7252 Controller Software Upgrade In addition to the main code, the RUSKA 7252 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.

  • Page 112: Replacement Parts

    RUSKA 7252. Replacement Parts The following is a list of the common replacement parts used in the RUSKA 7252 Calibrator. Table 6-2. RUSKA 7252 Calibrator - Parts List...

  • Page 113: Cleaning

    Maintenance Cleaning Table 6-3. RUSKA 7252 Calibrator - Replacement Parts List Part Number Description 3879016 TFT Display & Inverter 2135249 Battery 3911212 IEEE Board 3879645 CPU Board 3876760 Sensor LED Lamp Assembly 3908093 Sensor Photocell 3878975 Photocell Adjustment Tool 3879554...
  • Page 114 RUSKA 7252 Users Manual 6-22...

  • Page 115: Preparation For Storage And Shipment

    The governing discipline in ensuring a damage-free shipment is to ensure that the possibility of handling shocks to the Calibrator is minimized and/or prevented during transit. Fluke accomplishes this task by cradling the Calibrator within two foam cradles that are encapsulated within a double-walled, corrugated box. The Calibrator is restrained and supported, but still has resilience.
  • Page 116 The Calibrator must be prepared for shipment in the following manner: 1. Fluke has an RMA procedure in place. Please contact the Customer Service Center to obtain an RMA number prior to returning any equipment to Fluke. Have the following information available when contacting Fluke: •...

  • Page 117: Shipping Instructions

    HOUSTON, TX 77042 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.) glb53.bmp...
  • Page 118 RUSKA 7252 Users Manual...

  • Page 119: A Summary Of Specifications

    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.
  • Page 120 RUSKA 7252 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.
  • Page 121 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 Fluke publishes are at the 2 sigma level which would be at a 95% confidence level. Some manufacturers may state their uncertainty at different confidence level and therefore, you would need to be able to convert from one to the other in order to compare the two devices.
  • Page 122 0.009% of Reading per year The following two tables are uncertainty analysis examples for a single range RUSKA 7252 based on a three month and a yearly calibration. Table A-3. Uncertainty Analysis for RUSKA 7252 — Three Month Analysis Uncertainty Analysis — 3 Month Calibration Interval...
  • Page 123 Summary of Specifications Uncertainty Analysis Table A-4. Uncertainty Analysis for RUSKA 7252 — One Year Analysis Uncertainty Analysis – One Year Calibration Interval Uncertainty RUSKA 7252 (2 sigma) A. Performance — (Linearity, Hysteresis, Repeatability and Temperature) 0.003% of Full Scale B.
  • Page 124 Pressure Safety: Pressure Equipment Directive 97/23/EC-class, Sound Engineering Practice (SEP) Interface: IEEE 488 and RS232 Performance Table A-5. Performance Specifications: RUSKA 7252 Pressure Range 5 psi – 1000 psi 1000 psi – 2500 psi 15 psi – 50 psi 3000 psi (0.34 bar –...
  • Page 125 Summary of Specifications Uncertainty Analysis Table A-6. Performance Specifications: RUSKA 7252i MODEL RUSKA 7252i MODE GAUGE Precision From 25% to 100% FS: 0.005% RDG Below 25%FS: 0.005% of 25%FS Neg. Gauge Greater of 0.005% of 25%FS or 0.0075 psi (0.05 kPa) Precision (opt.) Stability Over 3 Months:...
  • Page 126 RUSKA 7252 Users Manual Gas Specifications Pressure Source Medium: Clean Dry Air or Nitrogen* ≤50 microns Pressure Source Particle Size Contamination: Pressure Source Max. Moisture Content: -50 °C dew point Pressure Source Max. Hydrocarbon Content: 30 ppm Vacuum Requirements Supply Vacuum:...

  • Page 127: B Summary Of Error Messages

    Appendix B Summary of Error Messages Summary of Error Messages Negative error numbers are from the Standard Commands for Programmable Instruments (Version 1991.0). Value Description and Corrective Action No Error. -103 Invalid Separator. Check punctuation in the SCPI command. -104 Data Type.
  • Page 128 Sensor Calibration Lost. The 7215xi sensor has lost its calibration and must be recalibrated. Factory Data Lost. Internal factory constants have been lost. Contact Fluke for more information. Calibration Mode. The Calibrate button must be pressed before SCPI calibration commands can be executed.

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