Fluke RUSKA 7050, RUSKA 7050i, RUSKA 7050LP User Manual

RUSKA 7050, 7050i &

7050LP

Precision Pressure Indicator

Users Manual

PN 3952343
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. This warranty extends only to the original buyer or end-user customer of
a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in
Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal
conditions of operation or handling. Fluke warrants that software will operate substantially in accordance
with its functional specifications for 90 days and that it has been properly recorded on non-defective media.
Fluke does not warrant that software will be error free or operate without interruption.

Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers
only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is
available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the
applicable international price. Fluke reserves the right to invoice Buyer for importation costs of
repair/replacement parts when product purchased in one country is submitted for repair in another country.

Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair,
or replacement of a defective product which is returned to a Fluke authorized service center within the
warranty period.

To obtain warranty service, contact your nearest Fluke authorized service center to obtain return
authorization information, then send the product to that service center, with a description of the difficulty,
postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following
warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke
determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside the product’s
specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair
costs and obtain authorization before commencing the work. Following repair, the product will be returned to
the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges
(FOB Shipping Point).

THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.

Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or
limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other
provision.

Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.

Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands

11/99

To register your product online, visit register.fluke.com

7050 – Change Language

Hold key for 5 seconds

mode

enter

Table of Contents

Chapter Title Page

1 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 ........................................... 1-2

Compressed Gas............................................................................... 1-2

Personal Protective Equipment ......................................................... 1-2

Inert Gases ........................................................................................ 1-2

Symbols Used in this Manual ................................................................ 1-2

General Information............................................................................... 1-3

Features ................................................................................................ 1-3

Fused-Quartz Bourdon Tube Technology ......................................... 1-3

Mercury-Free ..................................................................................... 1-3

NIST Traceability ............................................................................... 1-3

Universal Power Supply .................................................................... 1-3

Friendly Display ................................................................................. 1-4

Adjustable Pressure Display.............................................................. 1-4

Ease of Operation.............................................................................. 1-4

Modular Design ................................................................................. 1-4

Attractive Desktop Packaging............................................................ 1-4

Power-On Self Test ........................................................................... 1-4

Ease of Calibration ............................................................................ 1-4

Automatic Zero Adjust ....................................................................... 1-4

Automatic Head Correction ............................................................... 1-4

Choice of Medium.............................................................................. 1-4

Choice of Display Units ..................................................................... 1-4

Communications Interface................................................................. 1-5

Standard Equipment and Options ......................................................... 1-5

2 Theory of Operation ............................................................................ 2-1

i

RUSKA 7050, 7050i & 7050LP

Users Manual

Introduction............................................................................................ 2-1

Power Supply ........................................................................................ 2-1

Electronics Module ................................................................................ 2-2

Back-Plane Board.............................................................................. 2-2

Microprocessor Board ....................................................................... 2-2

IEEE-488 Interface ............................................................................ 2-3

Front Panel ........................................................................................ 2-3

Pneumatics Module............................................................................... 2-3

Measure Mode Pneumatics............................................................... 2-5

Reference Port .............................................................................. 2-5

Test Port ........................................................................................ 2-5

Transducer Module ............................................................................... 2-6

Quartz Bourdon Tube Sensor............................................................ 2-6

Sensor Board..................................................................................... 2-7

Linearization Term............................................................................. 2-7

Auxiliary Sensors............................................................................... 2-7

Case Reference Vacuum Sensor ...................................................... 2-8

Software ................................................................................................ 2-8

Software Safety Controls................................................................... 2-8

Oven Control ..................................................................................... 2-8

Pressure Reading and Correction ..................................................... 2-9

Zero Coefficients ........................................................................... 2-9

Range Coefficients ........................................................................ 2-9

3 Installation ........................................................................................... 3-1

Introduction............................................................................................ 3-1

Unpacking the PPI................................................................................. 3-1

Cautions ................................................................................................ 3-2

Powering Up the PPI ............................................................................. 3-2

Observing the PPI’s Full Scale Rating................................................... 3-3

Pneumatic Connections ........................................................................ 3-3

Test Port ............................................................................................ 3-3

Reference Port .................................................................................. 3-3

4 Local Operation ................................................................................... 4-1

Introduction............................................................................................ 4-1

Numeric Keypad ................................................................................ 4-1

Function Keys.................................................................................... 4-1

Rotary Knob....................................................................................... 4-1

Cancel, Previous ............................................................................... 4-2

Tutorial .................................................................................................. 4-3

Selecting Language........................................................................... 4-4

Selecting Mode of Operation ............................................................. 4-4

Instruments with the Barometric Reference Option....................... 4-4

True Absolute with Vacuum Reference Option ............................. 4-5

Main Menu............................................................................................. 4-5

Menu ..................................................................................................... 4-5

Menu | Setup ..................................................................................... 4-6

Menu | Setup — Limits .................................................................. 4-6

Menu | Setup — User .................................................................... 4-7

Menu | Setup — Units.................................................................... 4-9

Menu | Setup — Remote ............................................................... 4-10

Menu | Setup — System................................................................ 4-10

Menu | Calibrate ................................................................................ 4-12

ii

Contents (continued)

Calibration Password..................................................................... 4-12

Zeroing .......................................................................................... 4-12

Menu | Test........................................................................................ 4-13

Menu | Test — Self Test................................................................ 4-13

Menu | Test — Remote Test.......................................................... 4-13

Menu | Test — Shop1.................................................................... 4-14

Menu | Display................................................................................... 4-14

Menu | Display — Blank .................................................................... 4-14

5 Remote Operation ............................................................................... 5-1

Capabilities............................................................................................ 5-1

IEEE-488 ........................................................................................... 5-1

RS-232 .............................................................................................. 5-2

Remote/Local Operation ....................................................................... 5-2

Configuration ......................................................................................... 5-2

Device Messages .................................................................................. 5-3

SCPI Command Format .................................................................... 5-3

SCPI Response Format..................................................................... 5-3

ANSI/IEEE 488.2-1987 Command Summary.................................... 5-4

SCPI Command Summary ................................................................ 5-4

Example SCPI Commands................................................................ 5-6

SCPI Status Registers....................................................................... 5-6

6005 Interface Panel Emulation ............................................................ 5-8

Serial Operation .................................................................................... 5-8

Druck DPI-510 Emulation Command Summary .................................... 5-8

Supported Commands....................................................................... 5-8

Response Formats ............................................................................ 5-9

Reset Conditions ............................................................................... 5-9

Keyboard Entry.................................................................................. 5-9

Notes ................................................................................................. 5-10

Format ........................................................................................... 5-10

Zeroing .......................................................................................... 5-10

Rate ............................................................................................... 5-10

Units .............................................................................................. 5-10

Sample Program ................................................................................... 5-11

6 Maintenance......................................................................................... 6-1

Introduction............................................................................................ 6-1

Observing the Software Version Number .............................................. 6-1

Preventive Maintenance........................................................................ 6-1

Initiating the PPI’s Self Test............................................................... 6-1

Removing the PPI’s Cover ................................................................ 6-2

Moisture Filter.................................................................................... 6-3

Particle Filters.................................................................................... 6-3

Vacuum Pumps ................................................................................. 6-3

Processor Battery .............................................................................. 6-3

Calibration ............................................................................................. 6-3

Calibration Instructions...................................................................... 6-4

Preparation .................................................................................... 6-4

Storing the Coefficients ................................................................. 6-7

Vacuum (Negative Gauge) Calibrations ............................................ 6-7

RPT Calibration — Simulated Absolute............................................. 6-8

Editing the Calibration Coefficients.................................................... 6-9

Zeroing .............................................................................................. 6-10

iii

RUSKA 7050, 7050i & 7050LP

Users Manual

Gauge and Vacuum (Negative Gauge) Instruments ..................... 6-10

Absolute Instruments..................................................................... 6-11

RPT — Simulated Absolute Instruments ....................................... 6-12

Sensor Photocell Zeroing ...................................................................... 6-12

Fan Operation ....................................................................................... 6-15

System Software Update Procedure ..................................................... 6-16

Replacement Parts................................................................................ 6-16

7 Preparation for Storage & Shipment ................................................. 7-1

Introduction............................................................................................ 7-1

Disconnecting the PPI ........................................................................... 7-1

Packing Instructions .............................................................................. 7-1

Shipping Instructions ............................................................................. 7-3

Appendices

A Summary of Specifications .............................................................. A-1

B Summary of Error Messages........................................................... B-1

iv

List of Tables

Table Title Page

1-1. Symbols..................................................................................................... 1-3

1-2. RUSKA 7050 PPI - Options List ................................................................ 1-5

2-1. Conversion Factors ................................................................................... 2-3

3-1. General Specifications and Parameters.................................................... 3-2

6-1. Electronics Self Test.................................................................................. 6-2

6-2. RUSKA 7050 PPI - Parts List .................................................................... 6-16

v

RUSKA 7050, 7050i & 7050LP

Users Manual

vi

List of Figures

Figure Title Page

2-1. PPI Block Diagram .................................................................................... 2-1

2-2. RUSKA 7050 PPI Gauge Pneumatics Diagram 5 to 2500 psig

(34 kPa to 17.2 MPa) Full Scale Ranges .................................................. 2-4

2-3. RUSKA 7050 PPI Absolute Pneumatics Diagram to 50 PSIA

(340 kPa) FS ............................................................................................. 2-5

2-4. Shaft/Magnet Section ................................................................................ 2-6

2-5. Photocell/Light Spot .................................................................................. 2-7

2-6. Menu | Display-Menu ................................................................................ 2-9

3-1. RUSKA 7050 Back Panel.......................................................................... 3-3

4-1. RUSKA 7050 Front Panel ......................................................................... 4-1

4-2. Menu Tree ................................................................................................. 4-2

4-3. Main Menu................................................................................................. 4-3

4-4. Units Menu ................................................................................................ 4-3

4-5. Mode Menu ............................................................................................... 4-4

4-6. Main Menu Screen .................................................................................... 4-5

4-7. Menu Key - Functions ............................................................................... 4-5

4-8. Menu | Setup - Menu ................................................................................. 4-6

4-9. Menu | Setup | Limits - Menu..................................................................... 4-6

4-10. Menu | Setup | User - Menu ...................................................................... 4-7

4-11. Menu | Setup | Units - Menu...................................................................... 4-9

4-12. Menu | Setup | Units | Edit Name - Menu .................................................. 4-9

4-13. Menu | Setup | Remote - Menu ................................................................. 4-10

4-14. Menu | Setup | System - Menu .................................................................. 4-11

4-15. Menu | Test - Menu ................................................................................... 4-13

4-16. Menu | Test | Remote - GPIB Menu & Serial1 Menu................................. 4-14

4-17. Menu l Display - Menu............................................................................... 4-14

6-1. Menu | Test | Self - Menu .......................................................................... 6-2

6-2. Menu | Calibration ..................................................................................... 6-4

6-3. Vacuum Calibration ................................................................................... 6-7

6-4. Zeroing Menu ............................................................................................ 6-10

6-5. Zero Set..................................................................................................... 6-11

6-7. Centering the Photocell ............................................................................. 6-13

6-8. Correct Adjustment of Photocell Centering Bar......................................... 6-13

6-9. Photocell Location ..................................................................................... 6-14

6-10. Menu | Test | Shop 1 - Menu ..................................................................... 6-15

vii

RUSKA 7050, 7050i & 7050LP

Users Manual

7-1. Packing the PPI......................................................................................... 7-3

viii

Introduction

This manual contains operation and routine and preventive maintenance instructions for
the RUSKA 7050, RUSKA 7050i and RUSKA 7050LP Precision Pressure Indicator (PPI)
manufactured by Fluke. This section of the manual provides general information about
the PPI 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:

Chapter 1

General Information

• Technical Support USA: 1-800-99-FLUKE (1-800-993-5853)

• Calibration/Repair USA: 1-888-99-FLUKE (1-888-993-5853)

• Canada: 1-800-36-FLUKE (1-800-363-5853)

• Europe: [phone]

• China: [phone]

• Japan: [phone]

• Singapore: [phone]

• Anywhere in the world: [phone]

Or, visit Fluke's website at www.fluke.com

To register your product, visit http://register.fluke.com

To view, print, or download the latest manual supplement, visit

http://us.fluke.com/usen/support/manuals

Safety Information

Safety Summary

The following are general safety precautions that are not related to any specific
procedures and do not appear elsewhere in this publication. These are recommended
precautions that personnel must understand and apply during equipment operation and
maintenance to ensure safety and health and protection of property.

.

.

.

1-1

RUSKA 7050, 7050i & 7050LP

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.

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

Electrostatic discharge sensitive (ESDS) is applied to low
power, solid-state parts which could be damaged or destroyed
when exposed to discharges of static electricity. Maintenance
personnel are often not aware that an ESDS part has been
damaged or destroyed because electrostatic discharges at
levels less than 4,000 volts cannot be seen, felt, or heard.

W Caution

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.

Symbols Used in this Manual

In this manual, a Warning identifies conditions and actions that pose a hazard to the user.
A Caution identifies conditions and actions that may damage the Precision Pressure
Indicator (PPI).

Symbols used on the Precision Pressure Indicator (PPI) and in this manual are explained
in Table 1-1.

1-2

General Information

General Information 1

Table 1-1. Symbols

Symbol Description

J
W Important Information: refer to manual
X Shock Hazard

~

P

General Information

If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be
impaired.

The AC main plug, switch and power cord shall remain readily
accessible for the operation.

The RUSKA 7050 Precision Pressure Indicator uses force-balanced, fused-quartz
Bourdon tube technology to provide the precise measurement of pressure.

Earth Ground

Do not dispose of this product as unsorted
municipal waste. Go to Fluke’s website for
recycling information.

This equipment meets the requirements
of all relevant European safety directives.
The equipment carries the CE mark.

W Warning

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.

Features

The following features are available on all RUSKA 7050 PPIs.

Fused-Quartz Bourdon Tube Technology

(5 - 2500 psi full 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 PPIs 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 PPI’s universal power supply accepts AC voltages between 100-120 VAC and
220-240 VAC. To “reconfigure” the PPI for use in another country, the user simply
changes the power cord.

1-3

RUSKA 7050, 7050i & 7050LP

Users Manual

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 interface are separated into
modules, making maintenance faster and easier.

Attractive Desktop Packaging

A sturdy aluminum case houses all of the PPI’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 corrections.

Choice of Display Units

Standard units include inHg at 0 °C and 60 °F, kiloPascals, bars, psi, inH
20 °C, and 25 °C, kilograms per square centimeter, mmHg, cmHg at 0 °C, and cmH
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.

O at 4 °C,

2

O at

2

1-4

General Information

Standard Equipment and Options 1

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.

NVLAP Accredited Calibrations

Fluke 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 Fluke laboratory code
200491-0 to indicate that our accredited calibration services are in compliance with all
relevant requirements of ISO/IEC 17025:2005. Accredited calibration certifications are
now provided standard by Fluke Calibration.

Standard Equipment and 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.

Additional Power Cords: Additional power cords are available for most countries.

All options are summarized in 1-2. To order these items, please contact Fluke Calibration
Sales in the U.S. at [phone].

Table 1-2. RUSKA 7050 PPI - Options List

Option Part Number

LabView Driver (National Instruments) Downloadable from World Wide Web

Rack Mount Kit - Cabinets 18-24 inches deep 3879677

Vacuum Pump, 115/230 VAC 50/60 Hz 3917819

Power Cord, USA and Canada 284174

Power Cord, Central Europe 769422

Power Cord, India 782771

Power Cord, Japan 3898323

Power Cord, Australia/New Zealand 658641

1-5

RUSKA 7050, 7050i & 7050LP

Users Manual

1-6

Introduction

The PPI’s power supply, electronics, pneumatics, and sensor combine to form a complete,
stand-alone, measure and control instrument. This section of the manual describes the
PPI’s component modules and provides a general discussion of each.

Chapter 2

Theory of Operation

Primary Transducer Module

POWER

SUPPLY

AC

POWER

Power Supply

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

CASE

TUBE

BACKPLANE

BOARD

FRONT
PANEL

Electronic Module

IEEE

CARD

Figure 2-1. PPI Block Diagram

SENSOR

Photo

Sensor

MICROPROCESSOR

BOARD

SENSOR

BOARD

RS -232

IEEE-488

glc02.eps

2-1

RUSKA 7050, 7050i & 7050LP

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.

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 selected 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 PPI’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

Pneumatics 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 inches of water (4 °C) = kPa x 4.014742

kg/cm2 kilograms per square centimeter = kPa x 0.0101972

mmHg Millimeters of mercury (0 °C) = kPa x 7.500605

cmHg Centimeters of mercury (0 °C) = kPa x 0.7500605

knots indicated airspeed per NASA TN D-822

km/hr kilometers per hour = knots x 1.852

Feet feet of altitude per MIL–STD–859A

meters meters of altitude per MIL–STD–859A

User1 user defined = kPa x user defined

User2 user defined = kPa x user defined

Pa user defined (Pascals) = kPa x 1000.0

hPa user defined (hectoPascals) = kPa x 10.0

%FS percent of full scale

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.

Front Panel

The Front Panel contains the active matrix TFT color display, rotary knob and rubberized
keys used to operate the PPI.

Pneumatics Module

The PPI's Pneumatics Module varies depending on whether the PPI is a Gauge mode or
Absolute mode instrument. Gauge mode PPI's reference their measurements to
atmospheric pressure, whereas Absolute mode PPI 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. It can operate as a Gauge mode instrument if the user selects
to not add the reference pressure.

2-3

RUSKA 7050, 7050i & 7050LP

Users Manual

The 7050 can also be supplied with an optional vacuum reference sensor. In 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 mode in addition to gauge mode. The difference between these
two options is 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 Figure 2-2. The schematics for the Absolute
mode PPI is shown in Figure 2-3.

BAROMETRIC

REFERENCE

SENSOR

(SIMULATED

ABSOLUTE

OPTION)

REFERENCE

PORT

ZERO

PRIMARY SENSOR

VACUUM SENSOR

OPTI ONAL

TEST
PORT

glc03.eps

Figure 2-2. RUSKA 7050 PPI Gauge Pneumatics Diagram 5 to 2500 psig (34 kPa to 17.2 MPa) Full

Scale Ranges

2-4

Theory of Operation

Pneumatics Module 2

REFERENCE

PORT

ZERO

PRIMARY SENSOR

VACUUM SENSOR

Figure 2-3. RUSKA 7050 PPI Absolute Pneumatics Diagram to 50 PSIA (340 kPa) FS

TEST

PORT

glc04.eps

Measure Mode Pneumatics

Figures 2-2 and 2-3 summarize the Pneumatics of the PPI.

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 PPI’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 by a relief valve.

Barometric Sensor

For all Simulated Absolute instruments, the Reference Port is monitored by a precision
barometric sensor (Figure 2-2). This sensor provides the barometric offset that allows the
Gauge mode PPI to function in a simulated Absolute system.

Vacuum Reference Option

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.

Test Port

The Test Port connects the DUT to the Pneumatics Module.

The Test Port is protected by a relief valve.

2-5

RUSKA 7050, 7050i & 7050LP

Users Manual

Transducer Module

Quartz Bourdon Tube Sensor

The quartz Bourdon tube sensor is mounted in a machined aluminum housing. The sensor
consists of a helical quartz tube with a mirror affixed to one end, as shown in Figure 2-4.

A rigid beam is attached transverse to the axis of the helical tube. Attached to both ends
of this beam are electromagnetic coils. Mounted beneath the coils are permanent magnets.
A lamp assembly directs light through a quartz or sapphire window onto the mirror
affixed to the helical tube, as shown in Figure 2-5. The mirror reflects the light back
through the window and strikes two matching photodiodes. When there is zero pressure
differential across the helical tube, the photodiode assembly is mechanically adjusted so
that the light spot is centered between each photocell. In this “zero position,” the outputs
of the two photodiodes provide energy used to maintain the quartz assembly in its zero
position; thus, a force balance is created.

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 next section, Chapter 2, Sensor Board) 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.

L

U

O

T

S

B

A

L

O

E

D

ELECTROMAGNETIC
COIL

On Absolute Models, the process is similar, except that the Bourdon

E

tube is permanently evacuated to less than 0.1 mtorr and sealed at the

M

factory, and the test pressure is applied to the sensor case. With this
configuration, all test pressures are measured with respect to vacuum.

FUSED QUARTZ
BOURDON TUBE

AXIS OF ROTATION

MIRROR

TORSION
HINGE

PERMANENT
MAGNET

Figure 2-4. Shaft/Magnet Section

FLEXURE

glc05.eps

2-6

Theory of Operation

Transducer Module 2

PHOTOCELLS

LEFTHAND RIGHTHAND

SHIFTING SPOT OF
LIGHT, SHOWN AT
NULL POSITION
BETWEEN PHOTOCELLS

PHOTOCELLS GENERATE VOLTAGE
ACCORDING TO ILLUMINATION

Sensor Board

A temperature sensor, the quartz Bourdon tube pressure sensor and vacuum sensor are
monitored by the Sensor Board. The Sensor board is also used to control and maintain the
sensor housing at 50 °C.

Linearization Term

As described in the previous section, the relationship between the pressure being
measured and the current required to keep the quartz Bourdon tube in its zero position is
the main principle behind the operation of the PPI’s sensing element.

Ideally this pressure-current relationship would be a linear equation of the form

where I 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

BEAM OF LIGHT
REFLECTED FROM
ROTATING MIRROR

MIRROR

ROTATING AXIS

Figure 2-5. Photocell/Light Spot

1 cbPaP ++=

POTENTIOMETER FOR ZERO-ADJUST
CALIBRATION OF THE QBT GAGE

ERROR SIGNAL TO CONTROL AMPLIFIER IS
ZERO WHEN PHOTOCELLS ARE EQUALLY
ILLUMINATED

glc06.eps

KPl =

,

1

2

1

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 point shared between two ranges is required. Therefore, for the 7050i, a 5 point
calibration is performed and for the 7250LP, a 9 point calibration is performed to fully
characterize the RUSKA quartz sensors.

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.

2-7

RUSKA 7050, 7050i & 7050LP

Users Manual

Case Reference Vacuum Sensor

The case reference vacuum sensor is a user installed option. 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.

Software

The PPI is a digital, software-based instrument.

Software Safety Controls

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 the 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 MENU | DISPLAY screen and verifying that the temperature is at 50
addition to the temperature, this screen will show the duty cycle of the oven.

o

C. In

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 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
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

o

C. A unit that is operating properly, after

it has fully warmed up, should indicate a sensor temperature of 50

o

C. The Duty Cycle indicates the

o

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 (>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. If operating the instrument in a warm environment and the oven duty cycle is at
a low percentage (>10%) you will need to turn the fan on. See Chapter 6, Fan Operation.

When the operator changes the status of the fan, it will remain in that condition until the
operator changes the setting.

2-8

Theory of Operation

Software 2

Figure 2-6. Menu | Display-Menu

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.

Zero Coefficients

CsH Zero correction for High FSR (Full-Scale Resistors) Value is in counts

(7,381,975 = full scale of current sensor).

CsL Zero correction for Low FSR. Value is in counts (7,381,975 = full scale

of low FSR)

HsZ Hardware zero correction. (0 to 4095, center is 2048).

SsZ Zero corrections scaling factor. Ratio of High FSR to Low FSR. Used only when

Case Effect Coefficient or Oven Temperature Coefficient are non-zero.

s=0 for high range sensor, s=1 for low range sensor.

Range Coefficients

KnF 0=Range Unused

4=Valid High FSR Range
5=Valid Low FSR Range

2-6.bmp

Kn0, Kn1, Kn2 Calibration constants for range

Where A is the zero corrected counts (7,381,975 = full scale of current range) and
B is the calibrated counts (7,381,975 = full scale of current sensor)

B ++=

K

K

2

2

*

A

48

2

1

nn

*

24

2

KA

0

n

2-9

RUSKA 7050, 7050i & 7050LP

Users Manual

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

Introduction

This section of the manual discusses initial installation for the RUSKA 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.

Unpacking the PPI

Carefully unpack all components, checking for obvious signs of damage. The shipment
contains the following items:

• RUSKA 7050 or 7050i PPI,

• power cord,

• user’s manual,

• calibration report,

• user-specified instrument options.

Chapter 3

Installation

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.

Note

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.

3-1

RUSKA 7050, 7050i & 7050LP

Users Manual

Operating Humidity 5–95%RH, noncondensing all

Storage Humidity none* all

Operating Temperature 18 °C – 36 °C all

Storage Temperature -20 °C to 70 °C all

Table 3-1. General Specifications and Parameters

Parameter Value Model

*If 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.

Cautions

The following cautions should be heeded at all times to ensure safe operation of the PPI.

Never operate the PPI with the cover removed. The power
supply has internal voltages near 400 volts.

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.

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.

Do not expose the instrument to thermal and mechanical shock,
or vibration. This may affect performance and require
re-zeroing.

Electrical Power 100 – 120 VAC and

220 – 240 VAC

Power Consumption 150 W all

Warm-up Period < 3 hrs all

all

WX Warning

W Caution

See Chapter 1, Safety Information.

Powering Up the PPI

1. First, plug the power cord supplied with the PPI into the power connector on the

PPI’s back panel.

Grounding for the PPI is provided through the power cord.

2. 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.

3. 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.

3-2

W Caution

Installation

Observing the PPI’s Full Scale Rating 3

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.

Pneumatic Connections

Pneumatic connection to the PPI is straightforward. The following sections discuss each
port. All ports are ¼-inch NPT pipe fittings. See 3-1. Remove all plastic shipping plugs
from the back panel pneumatic ports.

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.

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).

NOTICE :

FAN I S NO R MALL Y OFF.
S EE USER' S MANUA L T O
TURN ON .

PO WER

85-26 5 V AC

50/60 HZ

150V A

S UPPLY

Figure 3-1. RUSKA 7050 Back Panel

EX HAUS T TES T R E F

glc08.eps

3-3

RUSKA 7050, 7050i & 7050LP

Users Manual

3-4

Introduction

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.

Chapter 4

Local Operation

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 key 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 F6.

Rotary Knob

The rotary knob selects a field for editing.

Figure 4-1. RUSKA 7050 Front Panel

glc09.eps

4-1

RUSKA 7050, 7050i & 7050LP

En ter S etup M en u

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.

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.

Menu

Setup

Enter Menu State

Limits

User

Set high, low & slew limits, control mode, control band and
access code

Set step size, head correction, filter and display digits

Units

Define user-defined units of measure

Remote

Se t ba ud , pa rity, d ata bits, sto p b its, G P IB ad dre ss

System

Set date and time, reset machine, view software version

Cal.

Enter calibrate menu

Zero

Zero Sensor

Test

En ter T est m enu

Self

Perform self test

Remote

Display remote status

Shop1

Display solenoid valve status

Disp.

Display transducer values

Blank

Figure 4-2. Menu Tree

Screen Saver

glc38.eps

4-2

Local Operation

Tutorial 4

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.

Figure 4-3. Main Menu

4-3.bmp

Figure 4-3 shows 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. The upper left corner
shows the current mode of the PPI. 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.

1. Change the pressure units. The units are changed by selecting the UNITS key on the

keypad.

Figure 4-4. Units Menu

glc11.bmp & glc12.bmp

4-3

RUSKA 7050, 7050i & 7050LP

Users Manual

2. Use the rotary knob located to the right of the display to move the highlight bar to the

desired unit.

The highlighted curser initially shows the current unit of measure. When
the rotary knob is moved, the current unit remains highlighted in a gray
color, and the new unit is highlighted in a light blue color.

3. When the unit desired is highlighted, press the ENTER key on the far right side of the

front panel, under the numeric keypad. The display will return to the MAIN screen
with the current units.

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.

Selecting Mode of Operation

The 7050 PPI is offered in three different modes. These are gauge only, absolute only,
and simulated absolute which operates in both gauge and absolute modes. Using a
barometric reference, or true absolute, the vacuum reference option allows for both gauge
and absolute modes.

Note

Instruments with the Barometric Reference Option

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.

Figure 4-5. Mode Menu

4-5.bmp

4-4

Local Operation

Main Menu 4

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.

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, Differential or
Absolute). The Main Menu can always be reached by repeatedly pressing PREVIOUS.
The RUSKA 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.

Menu

Figure 4-6. Main Menu Screen

4-6.bmp

The menu key is used to access the less commonly accessed configuration type functions.
The menu key accesses the Setup, Calibration, Program, Test, and Display functions.

Figure 4-7. Menu Key - Functions

4-7.bmp

4-5

RUSKA 7050, 7050i & 7050LP

Users Manual

Menu | Setup

Setup is used to configure the system. This function includes setting all of the limits, user
parameters, user-defined units of measure, remote interface and system setup.

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.

Figure 4-8. Menu | Setup - Menu

Figure 4-9. Menu | Setup | Limits - Menu

4-8.bmp

glc17.bmp

High Limit

The High Limit — User Defined Maximum Pressure Limit 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 pressure limit. In control mode, if for any reason the pressure exceeds the
user-defined limit, it will change into the measure mode and again display an error
message to the operator informing them that the error occurred.

4-6

Local Operation

Menu 4

This value can be edited using the rotary knob to highlight the High Limit. Then enter the
new value using the keypad. This will show up in the scratch pad on the lower portion of
the screen. Press the Enter key and the value for the high limit will be updated to the
value that was typed into the scratchpad.

Low Limit

The Low Limit — User Defined Minimum Pressure Limit is the same as the high limit
except it is to protect the DUT from low pressure limits.

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.

Access

The test access password allows the user to protect access to PPI 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.

Note

It is recommended that the access password be recorded and filed in a
secure location.

Menu | Setup — User

The Menu | Setup | User menu is used to setup all of the user specific configurations. This
includes setting the control step size, range of bar-graph, pressure gas head, display
pressure filter, display resolution digits, and audible key click.

Figure 4-10. Menu | Setup | User - Menu

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.

glc18.bmp

1. The Pressure Reference Line on the PPI is defined as the bottom

where the display and the front panel join. This provides the reference plane against
which the device under test (DUT) pressure is measured.

of the color display

4-7

RUSKA 7050, 7050i & 7050LP

Users Manual

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] | Setup [F2] | User [F2].

5. Press Medium [F3] to select either “Air” or “Nitrogen”. The selected units will be

highlighted.

6. Press Position [F4] to select if the position of the Device Under Test is either

“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.

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.

Pressure Filter

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
from 1 to 10.

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] | Setup [F2] | 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, +1), and then press the ENTER key to select.

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] | 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.

4-8

Local Operation

Menu 4

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 0 °C is calculated as follows.

mTorr

1000 °

=

xkPamTorr

Torr

1

x

1

Torr

x

CmmHg

01

°

0193377.0

CmmHg

01

1450377.0

x

psi

1

kPa

thus the conversion factor simplifies to 6180.7500xkPamTorr =

Figure 4-11. Menu | Setup | Units - Menu

4-11.bmp

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].

psi

2. Use the rotary knob to highlight the desired user-defined unit, and then select the

Edit Name [F1] function key.

3. The following sequence is used to change the name of the selected unit.

Figure 4-12. Menu | Setup | Units | Edit Name - Menu

4-12.bmp

4-9

RUSKA 7050, 7050i & 7050LP

Users Manual

a. Use the < [F4] or > [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.

Menu | Setup — Remote

The Menu | Setup | Remote screen is where the remote communication interface is set-up.

GPIB Address

Sets the IEEE-488 interface address.

Protocol

The Protocol defines which protocol should be used by the remote interface. The options
are Standard Communication for Programmable Instruments (SCPI) which is the standard
interface, 6000 to emulate the RUSKA Series 6000 Pressure Controller, and 510 to
emulate the Druck 510 Pressure Controller. When using the SCPI interface, the
RUSKA 7050 will emulate the RUSKA 7010 and 7215 Series Controllers.

Serial Interface Set-Up

The operator can set-up the Baud Rate, Data Bits, Parity, and Stop Bits for the Serial
Interface.

Menu | Setup — System

The System Menu identifies the Software release version that is being operated in the PPI.
It also stores and allows the operator to edit the Date and Time.

Figure 4-13. Menu | Setup | Remote - Menu

4-13.bmp

4-10

Local Operation

Menu 4

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

2. To set the system date, turn the rotary knob until Date is highlighted. Use the numeric

3. To set the system time, turn the rotary knob until Time is highlighted. Use the

Reset

The Reset [F1] command is used to re-boot the PPI.

To reset the system, from the Main Menu (press PREVIOUS until the Main Menu
appears), press Menu [F6] | Setup [F2] | System [F5] | Reset [F1].

Figure 4-14. Menu | Setup | System - Menu

4-14.bmp

(press PREVIOUS until the Main Menu appears), press Menu [F6] | Setup [F2] |
System [F5].

keypad to enter the current four-digit year, month, and day (yyyymmdd). All digits
must be entered. Press ENTER to accept.

numeric keypad to enter the current hour, minute, and second (hhmmss). All digits
must be entered. Press ENTER to accept.

4-11

RUSKA 7050, 7050i & 7050LP

Users Manual

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 the 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.

The calibration section in the PPI can be password protected to prevent any unauthorized
entry into the calibration section of the system. Refer to Chapter 6, Maintenance, for
more detailed information regarding the calibration of the PPI.

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 PPI or manually change the
calibration constants.

Zeroing

Note

It is recommended that the access password be recorded and filed in a
secure location.

1. The calibration password is set from the Calibration Menu. From the Main Menu

(press PREVIOUS until the Main Menu appears), press Menu [F6] | 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 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.

Fluke 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 Chapter 6, Zeroing, 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.

4-12

Local Operation

Menu 4

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 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 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. Refer to
Chapter 6, Maintenance, of the manual for more detailed information regarding the
zeroing procedure of the PPI.

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 7050.

Menu | Test — Self Test

The PPI can perform an electrical self test to assist in trouble shooting potential problems.
Refer to Chapter 6, Maintenance, for more details.

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.

Figure 4-15. Menu | Test - Menu

4-15.bmp

4-13

RUSKA 7050, 7050i & 7050LP

Users Manual

Figure 4-16. Menu | Test | Remote - GPIB Menu & Serial1 Menu

Menu | Test — Shop1

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 Chapter 6, Maintenance.

Menu | Display

The Menu | Display is used to conveniently monitor most of the sensor output parameters.
It is primarily used for troubleshooting.

Glc24.bmp & glc25.bmp

Menu | Display — Blank

Menu | Display — Blank is used as a screen saver in the 7050.

4-14

Figure 4-17. Menu l Display - Menu

glc26.bmp

Capabilities

The PPI 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

ANSI/IEEE Std 488.2-1987 IEEE Standard Codes, Formats, Protocols, and

Chapter 5

Remote Operation

Instrumentation

CommonCommands

SCPI 1991.0 Standard Commands for Programmable Instruments

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
AH1 Acceptor Handshake, Complete Capability
T5 Talker
L3 Listener
SR1 Service Request, Complete Capability
RL1 Remote-Local, Complete Capability
PP0 Parallel Poll, No Capability
DC1 Device Clear, Complete Capability
DT0 Device Trigger, 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.

C0 Controller, No Capability

Note

Do not change any jumpers or switch settings on the IEEE-488 interface
board. The IEEE-488 address is set by the Menu /Setup/Remote screen.

5-1

RUSKA 7050, 7050i & 7050LP

Users Manual

RS-232

The RS-232 interface supports standard serial operation from a computer to a single PPI.
RS-232 supports the 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 1 or 2
Handshaking XON/XOFF

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

Remote/Local Operation

In Local mode, the PPI is operated manually through the front panel. Chapter 4 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 SCPI command “SYSTEM:KLOCK” on to lock the local keyboard. The

PPI will disable the local keyboard until the command “SYSTEM:KLOCK OFF” is
received.

3. Issue the SCPI command “DISPLAY:ENABLE OFF” or

“DISPLAY:TEXT <string>.” 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.

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

5-2

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. Repeat steps 2 and 3 to set all parameters needed.

Device Messages

SCPI Command Format

SCPI mnemonics have two forms: long and short. The short form is all in capital letters.
The long form is the entire mnemonic. Commands may use either the short form or the
entire long form. No other forms are accepted. SCPI ignores case: uppercase and
lowercase are equivalent.

A SCPI command is made by following the command tree as presented in the command
summary. Each level adds a mnemonic to the command separated by colons (:).
Mnemonics enclosed in 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 0A). Carriage returns, tabs, and
other control characters are ignored.

SCPI Response Format

Most values can be queried by appending a question mark (?) to a command and not
specifying any parameters. Commands ending with a question mark (?) in the command
summary cannot be set only queried. Multiple values from a single command are
separated by commas. Responses from different commands in the same message are
separated by semicolons (;). The response message is terminated by a line feed
(hexadecimal 0A).

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

RUSKA 7050, 7050i & 7050LP

Users Manual

ANSI/IEEE 488.2-1987 Command Summary

*CLS Clear Status
*ESE? Event Status Enable Query
*ESE <number> Event Status Enable
*ESR? Event Status Register
*IDN? Identification
*OPC? Operation Complete Query (Returns 1)
*OPC Operation Complete
*RST Reset
*SRE? Service Request Enable Query
*SRE <number> Service Request Enable
*STB? Status Byte Query
*TST? Self-Test Query
*WAI Wait (No operation)

SCPI Command Summary

The current value associated with a SCPI command may be read by appending a question
mark to the command. For example CALC:LIM:UPP? will return the current upper
pressure limit.

MEASure
[:PRESsure]? Returns Current Pressure Reading
:TEMPerature2? Returns Oven Temperature
:TEMPerature3? Returns Oven 2 Temperature (7050xi only)
:PRESsure2? Return Case Pressure
:PRESsure3? Return Barometric Reference Pressure
:SLEW? Returns Pressure Slew Rate (units/sec)
CALCulate
:LIMit
:LOWer <number> Get/Set Low Pressure Limit
:SLEW <number> Get/Set Slew Rate Limit
:UPPer <number> Get/Set High Pressure Limit

:TARE

:VALUE <number> Get/Set Tare Value
:STATe ON/OFF Set Tare state using current pressure
CALibration
[:PRESsure]
:VALue<n> <number> Perform calibration point
:DATA
:POINts? Number of calibration constants
:VALue<n>? returns cal. constant label, value
:VALue<n> <number> Set calibration constant
:CALibration
:POINts? Number of calibration points
:VALue? Nominal calibration point
:DATE? Last calibration date
:TIME? Last calibration time

:ZERO Performs Zero Calibration

:VALUE<number> Sets Vacuum Value
:INITiate Enter Zero Calibration Mode
:INITiate? Status for Cal, Pressure, Temp., Reference
Cal: 0=Not Zeroing,
1=Local Zero,
2=Remote Zero
Pressure, Temperature, Reference:

-1=Out of Range

>0=Time until stable
:RUN Start Zero Calibration
:DATE? Last zero date
:TIME? Last zero time
:PRESsure2 Case reference sensor
:VALue<n> <number> Perform calibration point
:DATA
:POINts? Number of calibration constants
:VALue<n>? returns cal. constant label, value
:VALue<n> <number> Set calibration constant

5-4

0=Stable

Remote Operation

Device Messages 5

:CALibration
:POINts? Number of calibration points
:VALue? Nominal calibration point
:ZERO <number> Zero sensor to value
:PRESsure3 Reference sensor

Same as PRESsure2 above

:PRESsure4PDCR sensor

Same as PRESsure2 above

:VACuum

Same as PRESsure2 above

:TEMPerature Gas Temperature

Same as PRESsure2 above

:TEMPerature2 High Sensor Temperature

Same as PRESsure2 above

:TEMPerature3 Low Sensor Temperature

Same as PRESsure2 above

:MODE? return 1 if calibration edit enabled
:MODE <access code> Request calibration edit
DISP
:ENABle ON|OFF|1|0 Turns Front Panel Display On/Off
TEXT <string> Displays Message on Front Panel
:BGRaph<number> Sets Bar Graph Maximum
SENSE
[:PRESSure]
[:RESolution] <number> Set Pressure Display Resolution
:AUTO<boolean>|ONCE Return to Default Resolution
:MODE? Returns ABSOLUTE or GAUGE
:MODE ABSolute|GAUGe Turns On or Off Simulated Absolute
:RANGE
[:UPPer]? Returns PPI Full Scale Value in Units
:LOWer? Returns Lowest Calibrated Value
:REFerence
[:HEIGht] <number> Set Gas Head Height

STATus

:MEDium N2|AIR Set Gas Medium

:OPERation
[:EVENT]? Read/Clear Operation Event Register
:CONDition? Read Operation Condition Register
:ENABle<number> Set Operation Enable Mask
:QUEStionable
[:EVENT]? Read/Clear Questionable Event Register
:CONDition? Read Questionable Condition Register
:ENABle <number> Set Questionable Enable Mask
:PRESet Reset Condition Flags
SYSTem
:DATE <year>,<month>,<day> Set System Date
:ERRor? Returns <error#,”descr;info”>
Or 0,”No Error”
:KLOCk ON|OFF|1|0 Lock Keyboard
:TIME <hour>,<minute>,<second> Set System Time
:VERSion? Returns 1991.0
:LANGuage “6000”|”SCPI”|"500" Set Interface Protocol to 6000 or SCPI, or

:PRESet Reset System
TEST
:ELECtronic? Perform Electronic Self-Test
STOP Abort Pneumatic Self-Test
UNIT
:DEFine<n> <name>,<number> Define a Unit
:LENGth MM|IN Set Length Units for Head Height
[:PRESsure] <unit name> Set Pressure Units. Valid unit names are
KPA, BAR, PSI, KG/CM2, MMHG0C,
CMHG0C, INHG0C, INHG60F
CMH204C, INH2020C, INH2025C, %FS

FT, M, KNOT, KM/HR, MPA, PA

Druck DPI-500

5-5

RUSKA 7050, 7050i & 7050LP

Users Manual

Example SCPI Commands

To request the current pressure reading, all of the following commands are equivalent:

:MEASURE:PRESSURE?

To zero the unit via the remote interface use the following sequence:

CAL:ZERO:INIT Enter Zero Mode
CAL:ZERO:INIT? Read Status (Mode, Pressure, Temperature, Reference)
and Wait Until Stable.

CAL:ZERO:RUN Start Zero Adjust Sequence
STAT:OPER:COND? Wait Until Complete (Bit 0 = 0)

SCPI Status Registers

Three types of status registers are available: Condition, Event, and Enable.

:measure:pressure?
:MeAsUrE:pReSsUrE?
:meas:pres?
:measure?
:meas?
MEAS?

Condition registers always show the current status of the instrument. Bits may turn on
and back off between reads. The status read is the status of instrument at the moment of
the read. Condition registers include:

*STB? Status Byte Register
*ESR? Standard Event Status Register
STAT:OPER:COND? Operation Status Condition Register
STAT:QUES:COND? Questionable Status Condition Register

Event registers do not show the current state but flag the bits in the condition registers
that have changed since the last time the event register was read. When an event register
is read it is reset to zero.

STAT:OPER:EVENT? Operation Status Event Register
STAT:QUES:EVENT? Questionable Status Event Register

Enable registers are set by the user to create summary bits. If the user sets a bit in the
enable register, when the instrument sets the corresponding bit in the event register a
summary bit in the Status Byte Register is set.

*ESE
STAT:OPER:ENAB
STAT:QUES:ENAB

The 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.

Bit 6 Service request. Set when an event enabled in SRE occurs. (This bit is not

used in SRE.)
Bit 5 EBS - Event status bit. Set when an event enabled in ESE occurs.
Bit 4 MAV - Message available. Set when a response is ready to be sent.

5-6

Remote Operation

Device Messages 5

Bit 3 Questionable status summary. Set when an event enabled in

QUES:ENABLE occurs.
Bit 2 Error/event queue not empty.
Bit 1 Reserved. 0.
Bit 0 Reserved. 0.

Standard Event Status Register (ESR), Standard Event Status Enable Register (ESE)

Bit 7 Power-on. Set at power-up.
Bit 6 Reserved 0.
Bit 5 Command error. Error in command syntax.
Bit 4 Execution error. Error in command execution.
Bit 3 Device dependent error. Device error independent of commands.
Bit 2 Query error. Output queue empty when request received.
Bit 1 Reserved. 0.
Bit 0 Operation complete. Set for *OPC command.

Operation Status (OPER:EVENT, OPER:CONDITION, OPER:ENABLE)

Bit 0 Calibrating. Currently performing a calibration.
Bit 1 Settling. Control setpoint has not been reached. Pressure tolerance set by
SOUR:PRES:TOL
Bit 2 Reserved. 0.
Bit 3 Reserved. 0.
Bit 4 Measuring. The instrument is actively measuring.
Bit 5 Reserved. 0.
Bit 7 Reserved. 0.
Bit 8 Self-test in progress.
Bit 9 Reserved.
Bit 10 Reserved. 0.
Bit 11 Reserved. 0.
Bit 12 Reserved. 0.
Bit 13 Reserved. 0.
Bit 14 Program running.
Bit 15 Reserved. 0.

Questionable Status (QUES:EVENT, QUES:CONDITION, QUES:ENABLE)

Bit 0 Reserved.
Bit 1 Reserved. 0.
Bit 2 Time is questionable. Set when the clock has not been set.
Bit 3 Temperature is questionable. Sets when oven temperature is not within

range.
Bit 4 Reserved. 0.
Bit 5 Reserved. 0.
Bit 6 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.
Bit 9 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.

5-7

RUSKA 7050, 7050i & 7050LP

Users Manual

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:

1. The PPI 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. Any message written to the PPI that starts with a colon as the first character is

interpreted as a SCPI command.

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”.

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 0D) or a line feed (hexadecimal 0A).
The responses are always terminated by a carriage return followed by a line feed.

5-8

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
C0 Go to MEASURE mode.
C1 Go to CONTROL mode.
D0, D2 Transmit Pressure Reading
D1 Transmit Set-point
Fxx (Ignored)
I0 Disable SRQ
I1 SRQ on In Limit
I2 SRQ on Error
I3 SRQ on In Limit and Error
I4 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
J0,J1,J2 Set Pre-programmed rate.
M Unlock keyboard
N0,N1,N2,N3,N4 Set talk mode notation
O1 Zero
P<value> Set pressure Set-point
R0 Unlock keyboard

Remote Operation

Druck DPI-510 Emulation Command Summary 5

R1,R2 Lock keyboard
S0,S1,S2,S3 Set pre-programmed units
T0 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

immediately)

V<value> Set slew rate (sets low overshoot mode)
W<value> Set In Limit wait time
/0 to /11 Set set-point as fraction of P value
*0 to *11 Set pre-programmed set-point
@0 Disable error reporting
@1 Enable error reporting

Response Formats

N0 <Pressure or Setpoint><REM|LOC>RnSnDn[@nn]

N1 <Pressure or Setpoint>[@nn]

N2 <REM|LOC>RnSnDnCnInFn

N3 <In Limit Status>[@nn]

N4 @nEnJnVnnnnUaaaa

Note

Secondary addressing is not supported.

Reset Conditions

N0 D0 F0 I0 @1 R0 S0 W002

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 J0, J1, J2

MENU/SETUP/REMOTE/510EMUL/F1UNIT

MENU/SETUP/REMOTE/510EMUL/F2UNIT

MENU/SETUP/REMOTE/510EMUL/F3UNIT

Select units for S0, S1, S2

MENU/SETUP/REMOTE/510EMUL/RATIOS

Specify ratios used by /0 to /11

MENU/SETUP/REMOTE/510EMUL/PRESETS

Specify presets used by *0 to *11

5-9

RUSKA 7050, 7050i & 7050LP

Users Manual

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.

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 rate is positive it will be used at the maximum rate with the overshoot set to low. If
the rate is zero then the maximum rate 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
9 cmHg cmHg 0
10 mHg cmHg 0
11 mmH2O cmH
12 cmH2O cmH
13 mH2O cmH
14 torr mmHg 0
15 atm bar
16 psi psi
17 lb/ft2 psi
18 inHg inHg 0
19 "H2O04 inH
20 'H2O04 InH
21 SPEC'L User Defined 1
22 "H2O20 inH
23 'H2O20 inH

2

2

o

o

C

o

C

O 4oC

2

O 4oC

2

O 4oC

2

o

o

C

O 4oC

2

O 4oC

2

O 20oC

2

O 20oC

2

C

C

5-10

Remote Operation

Sample Program 5

Sample Program

Sample Program - 7050 GPIB (IEEE-488) - Zero Sequence

/*------------------------------------------------------------*/
/* Sample Program 2 - 7050 GPIB (IEEE-488) */
/* */
/* Zero Sequence */
/*------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>

#include "decl.h"

/*------------------------------------------------------------*/

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 (void)
{
char *p;

/*---------------------------*/
/* Initialize GPIB Interface */
/*---------------------------*/
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.\n");
return;
}

/*-----------*/
/* Zero 7010 */
/*-----------*/
if (!zero ( ))
{ ibonl (device, 0);
return;
}
/*----------------------*/
/* Reset GPIB Interface */
/*----------------------*/
ibonl (device, 0);
}

/*------------------------------------------------------------*/
/* Zero : perform zero adjust of 7250 */
/*------------------------------------------------------------*/
int zero (void)
{
int cstat, pstat, tstat, rstat;

clrscr ( );
cprintf ("Zeroing");

gotoxy (1, 5); cprintf ("Pressure Reading");
gotoxy (1, 6); cprintf ("Sensor Temperature");
gotoxy (1, 7); cprintf ("Reference Pressure");

5-11

RUSKA 7050, 7050i & 7050LP

Users Manual

/*-------------------*/
/* Enter Zero Mode */
/* CAL:ZERO:INIT */
/*-------------------*/
write_7000 ("CAL:ZERO:INIT\n");

/*-------------------------------------------------*/
/* Wait for calibration values to be within limits */
/* CAL:ZERO:INIT? */
/*-------------------------------------------------*/
do
{ if (kbhit ( ))
{ getch ( );
break;
}

request_7000 ("CAL:ZERO:INIT?\n");
sscanf (buffer, "%d,%d,%d,%d", &cstat, &pstat, &tstat, &rstat);

if (check_errors ( ))
return 0;

gotoxy (20, 5);
if (pstat == 0) cprintf ("Stable ");
else if (pstat < 0) cprintf ("Out of Range ");
else if (pstat > 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");
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:OPER:COND?\n");
sscanf (buffer, "%d", &status);

if (check_errors ( ))
return 0;

gotoxy (1, 9);
cprintf ("Zeroing");
}
while ((status & 1) != 0);

gotoxy (1, 9);
cprintf ("Zero Complete");
return 1;
}

/*------------------------------------------------------------*/
/* check_errors : display all GPIB and 7250 error messages */
/* return TRUE if any errors were found */
/*------------------------------------------------------------*/

int check_errors (void)

5-12

Remote Operation

Sample Program 5

{
unsigned char status7;
int retval;

/*---------------------------------*/
/* Check for GPIB Interface Errors */
/*---------------------------------*/
if (ibsta & ERR)
{ cprintf ("GPIB Status=%4X Error=%d\r\n", ibsta, iberr);
return 1;
}

/*-----------------------*/
/* Check for 7250 Errors */
/*-----------------------*/
retval = 0;
while (!kbhit ( ))
{ ibrsp (device, &status7); /* Serial poll */
if ((status7 & 4) == 0) /* Check error bit */
break;
retval = 1;
request_7000 ("SYST:ERR?\n"); /* Get error message */
cprintf (buffer);
}
return retval;
}

/*------------------------------------------------------------*/
/* write_7000 : write a command to the 7250 */
/*------------------------------------------------------------*/
void write_7000 (char *s)
{
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));
}
/*------------------------------------------------------------*/

5-13

RUSKA 7050, 7050i & 7050LP

Users Manual

5-14

Introduction

Very little maintenance is required for the PPI. This section of the manual discusses
suggested maintenance procedures.

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 MENU | SETUP | SYSTEM. The software version number will appear on the

screen.

Chapter 6

Maintenance

3. Press PREVIOUS to return to the previous screen.

Preventive Maintenance

Although the PPI is designed to be nearly maintenance free, occasional preventive
maintenance is required to keep the PPI’s performance optimal.

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

6-1

RUSKA 7050, 7050 & 7050LP

Users Manual

Figure 6-1. 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.

Table 6-1. Electronics Self Test

Test Description Action on failure

Processor Tests the processor chip Replace processor board.

Clock Tests the real time clock Replace processor board.

Timer Tests 10 ms interval timer Replace processor board

EEPROM Tests the nonvolatile memory Replace processor board

Oven Tests operation of the sensor oven Replace sensor assy. Allow oven to

warm up.

Removing the PPI’s Cover

WX Warning

The PPI should only be opened by qualified
electrical/mechanical service technicians. Lethal voltages are
present and exposed in the power supply and display.

glc27.bmp

1. Turn 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.

6-2

Maintenance

Calibration 6

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).

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.

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. When the pump is turned off, power is removed from the solenoid
and the vacuum is vented to atmosphere. Periodic changing of vacuum pump oil should
also be done as recommended by the vacuum pump manufacturer.

Processor Battery

The processor board uses a lithium battery to maintain time and date information. This
battery has a varying life. If the instrument is left on 24 hours a day, it may last 5 to 10
years. If the instrument is stored, it may only last one year. Annual replacement is
recommended. To replace the battery:

1. Turn off power and remove the instrument cover.

2. Remove the processor card by removing the screw and the bracket that locks the

display cable in place and gently rock the card upward.

3. Holding the processor card, remove the battery (the round silver object), by carefully

pulling on the battery.

4. Plug in a new battery (part number 4-725).

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 Chapter 4, Menu; Menu ⎢Setup;
Menu ⎢Setup – System; Date/Time.

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.

The calibration procedure automatically generates coefficients that are
stored in memory on the PPI. 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.” (See
Chapter 6, Barometric Reference Calibration — Simulated Absolute.)

Note

6-3

RUSKA 7050, 7050 & 7050LP

Users Manual

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 follow the multi-step calibration procedure on the PPI’s display. The
standard PPI requires a positive pressure calibration. A vacuum (negative gauge) option
is available and requires special calibration; see Chapter 6, Vacuum (Negative Gauge)
Calibrations. No disassembly is required and there are no potentiometers to tune.

The uncertainty of the final calibration must include the uncertainty of the
pressure standard being used.

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.

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 (Chapter 4).

4. If desired, change the PPI’s units of measure (Chapter 4) to match those of the
calibration standard.

Note

5. Set the gas head to 0. Select MENU | SETUP | USER.

6. To access the calibration screen, select MENU | CALIBRATION.

Figure 6-2. Menu | Calibration

glc28.bmp

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.

6-4

Maintenance

Calibration 6

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. To begin Step 1 of the calibration process, select the Zeroset [F1] button. 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 PPI
completes Step 1, the calibration screen will appear.

On High Pressure Models, pressure must be removed from the test port. If zeroing
an Absolute unit then the Test Port must be isolated.

Step 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, 7050i or 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 point. The operator can re-check this pressure point prior to
completing and accepting the full calibration.

6-5

RUSKA 7050, 7050 & 7050LP

Users Manual

2. The Step 1, actual value will be highlight. This is your first pressure point in the
calibration procedure.

If 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.

3. Using your calibration standard, generate the pressure shown in the Apply column.
When the measured pressure stabilizes, use the PPI’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 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.

Note

Step 3

Note

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, number 1, if necessary.

1. Generate the next pressure calibration point requested by the PPI. Apply this pressure
using calibration standard and follow the instructions in Step 2, number 3, entering
the actual pressure applied.

2. Repeat this procedure until all of the calibration steps are complete. Review the Adj.
%FS field to see if one point has a significantly higher adjustment required than other
points in the calibration. This may indicate that there was an error in that specific
calibration point. The operator can re-check this pressure point prior to completing
and accepting the full calibration. To re-enter a point, use the rotary knob and move
the highlighted curser to the actual pressure values in the step in question. Generate
the requested apply pressure using the standard and enter then new actual value when
stabilized.

6-6

Maintenance

Calibration 6

Storing the Coefficients

Step 4

Calibration is complete. To exit the calibration procedure without storing the calibration
coefficients in memory, press CANCEL. To store the calibration coefficients in memory,
select the Done [F6] key and the PPI will calculate all of its new coefficients.

Note

In additional to saving the calibration coefficients to the PPI's memory, the
user is advised to separately record the calibration coefficients and store
this "backup" in a safe place.

Step 5

1. Press PREVIOUS to return to the Main Menu.

2. Once the calibration procedure is complete, the user should verify several pressure
readings against the pressure standard. If there are variances beyond the stated
precision, then an error was probably made in generating one of the calibration
pressures, and the calibration procedure should be repeated.

Vacuum (Negative Gauge) Calibrations

Vacuum mode is an available option. The following configuration should be used when
calibrating in the Vacuum mode.

METERING
VALV E

CUTOFF VALVE

DEADWEIGHT GAUGE

REF VACUUM

SYSTEM

PRESSURE & VACUUM

INLET

Figure 6-3. Vacuum Calibration

TEST REFERENCE

DPC

PRESSURE

CONTROLLER

EXHAUST

glc29.eps

6-7

RUSKA 7050, 7050 & 7050LP

Users Manual

To calibrate in Vacuum mode with the configuration shown in Figure 6-3, 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, there 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.

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.

1. Place the PPI in Measure mode. Remove all pressure sources from the system.

2. Connect a pressure standard to the Reference Port of the PPI.

3. If desired, change the PPI’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. If the calibration access code is
enabled, enter it at the prompt. The first Calibration screen will appear.

7. 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;

Step The pressure step in the calibration sequence.

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.

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 700 to 1100 mbar absolute. The selected pressures should be spaced as
far apart as possible within the allowable range.

9. Generate the first pressure. Enter the actual value of the applied pressure generated
by the standard and press ENTER.

10. Generate the second pressure. Enter the actual value of the applied pressure generated
by the standard and press ENTER.

6-8

Maintenance

Calibration 6

11. 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 generating one of the calibration pressures, and the calibration
procedure should be repeated.

12. Remove the pressure source from the Reference Port.

Editing the Calibration Coefficients

If the PPI’s memory is erased but the calibration coefficients are known, the user can
restore the coefficients to the PPI 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. If the backup coefficients are questionable,
perform the calibration procedure in its entirety.

1. Verify that the PPI is in Measure mode (Chapter 4).

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 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.

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 PPI’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. 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.

6-9

RUSKA 7050, 7050 & 7050LP

Users Manual

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.

If during the zeroing procedure, the message “Mechanical Zeroing Needed” appears, the
sensor photocell may need to be zeroed. See Chapter 6, Sensor Photocell Zeroing, for
more information.

The zeroing screen presents several pieces of information.

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.

By-passing this wait period can have a negative effect on the zeroing
procedure.

Gauge and Vacuum (Negative Gauge) Instruments

1. Verify that the Reference Port is open to atmosphere.

Note

2. Enter the Calibration screen by selecting MENU | CALIBRATION.

3. Select Zero [F1]. Do NOT press the Calibrate button.

Figure 6-4. Zeroing Menu

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.

6-4.bmp

6-10

Maintenance

Calibration 6

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 sensor

1. 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.

2. Enter the Calibration screen by selecting MENU | CALIBRATE.

3. 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 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.

Figure 6-5. Zero Set

6-5.bmp

4. Wait for the vacuum level on the test port to stabilize.

5. Press OK [F6].

6. Do not disturb the instrument while zeroing is in process.

7. Wait for the zeroing procedure to finish.

8. Press PREVIOUS to return to the Main Menu.

6-11

RUSKA 7050, 7050 & 7050LP

Users Manual

RPT — Simulated Absolute Instruments

Simulated absolute PPI’s contain two sensors that require periodic zeroing. The primary
sensor is zeroed according to the instructions in Chapter 6, Gauge and Vacuum (Negative
Gauge) Instruments, or Chapter 6, Absolute Instruments. 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 are 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.

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.

Note

Sensor Photocell Zeroing

If the error message “Mechanical Zeroing Needed” is displayed, the sensor photocell
must be zeroed. The following steps describe this process.

WX Warning

The PPI should only be opened by qualified
electrical/mechanical service technicians. Lethal voltages are
present and exposed in the power supply and display.

The sensor MUST have zero differential between the Test port and
Reference port. For Gauge PPIs, apply atmospheric pressure to the
Reference port. For Absolute PPIs, apply a vacuum to the Reference port

μ

(<200

1. Remove the PPI’s top cover.

2. Locate and remove the plastic zeroing plug located on 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 word Primary is
displayed above the calibration coefficients.

5. Select Zero [F1]. Do NOT press the Calibrate button.

Hg.)

Note

6. Select the Mechanical Zero [F1] key.

6-12

Maintenance

Sensor Photocell Zeroing 6

Figure 6-6. Photocell Zeroing Menu

7. Referring to Figure 6-6, 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 # 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.

6-6.bmp

8. 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.

Figure 6-8. Correct Adjustment of Photocell Centering Bar

Figure 6-7. Centering the Photocell

glc33.bmp

glc34.bmp

6-13

RUSKA 7050, 7050 & 7050LP

Users Manual

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. Now the width of the yellow line should be
minimized.

12. Tap on the bracket with a screwdriver handle to relieve mechanical stress. Continue
to tap on the bracket until the counts stop changing.

13. If the zero moved significantly as a result from tapping the bracket, repeat this
procedure as necessary.

14. Reinstall plastic zeroing plug.

15. After the unit has become thermally stabilized, perform a normal instrument zeroing
procedure. See Chapter 6, Editing The Calibration Coefficients.

ALLEN SCREW

INSERT PHOTOCELL

CENTERING TOOL HERE

6-14

Figure 6-9. Photocell Location

glc35.eps

Maintenance

Fan Operation 6

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 controlled to 50
percentage of time that the oven control is turned on in order to maintain the oven at the
proper set-point of 50
should indicate a sensor temperature of 50

o

C. A unit that is operating properly, after it has fully warmed up,

o

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 (>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. If operating the instrument in a warm environment and the oven duty cycle is at
a low percentage (>10%) 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.

o

C. The Duty cycle indicates the

To turn the fan on or off, press Menu [F6] from Main Menu, then Test [F5] | Shop1 [F5].

Use the rotary knob to highlight either fan Off or On. Press ENTER to select.

System Software Update Procedure

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 appropriate, 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>.IMG. Unzip these files into a directory on the PC.

2. Set the 7XXX to 9600 baud, 8 databits, no parity, 1 stopbit.

Figure 6-10. Menu | Test | Shop 1 - Menu

Note

6-10.bmp

6-15

RUSKA 7050, 7050 & 7050LP

Users Manual

3. Run the program Update7.

4. Follow the prompts to select the communications port and the image file.

5. When the upgrade is finished, Update7 running on the PC and the 7XXX should both
display Complete.

Replacement Parts

The following is a list of the common replacement parts used in the RUSKA 7050 PPI.

Table 6-2. RUSKA 7050 PPI - Parts List

Part Number Description

3915651 Zeroing Valve

3879016 TFT Display & Inverter

3876760 Sensor LED Lamp Assembly

3908093 Sensor Photocell

3878975 Photocell Adjustment Tool

3962098 Fan Assembly

3878927 Rotary Encoder

3878543 Front Panel Keyboard Electronic Card

6-16

Preparation for Storage & Shipment

Introduction

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 PPI
during shipment. This damage is not covered by the carrier’s
insurance.

Disconnecting the PPI

1. Relieve all pneumatic pressure from the PPI.

Chapter 7

W Caution

2. Turn the PPI power switch to the off position.

3. Disconnect the power cable from the PPI power receptacle.

4. Disconnect all pneumatic lines and fittings from the PPI’s back panel.

5. Plug all ports.

Packing Instructions

To prevent shipping and handling damage to the instrument, adhere to and strictly follow
the instructions below.

The governing discipline in ensuring a damage-free shipment is to ensure that the
possibility of handling shocks to the PPI is minimized and/or prevented during transit.
Fluke 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.

W Caution

7-1

RUSKA 7050, 7050i & 7050LP

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. The foam cradle
ensures that a minimum of 3 inches of foam separates the inner surface of the box and
any portion of the PPI.

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.

The PPI must be prepared for shipment in the following manner:

1. Fluke Calibration 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:

• the part number,

• the serial number,

• the purchase order number,

• the billing and ship to address, and

• the buyer’s name and telephone number.

W Caution

This information plus the RMA number must be attached to the unit when it is shipped to
Fluke Calibration. There will be a minimal charge for inspection and/or evaluation of
returned goods.

2. Enclose the PPI in plastic or any good water barrier material. Antistatic material is
recommended.

3. If the original shipping carton is not usable or available, use a double-walled
corrugated carton with a 275-lb rating. The recommended carton size is
25 1/2 x 19 1/2 x 12 3/8 inches.

4. Insert one foam cradle from the original shipment onto the floor of the box. (The
original foam cradles are of the same type of construction and are completely
interchangeable.) If the foam cradles are not available, cover the bottom and sides
with no less than 3 inches of N–95 foam strips. Arrange the strips in the
configuration illustrated in 7-1.

5. Before sealing the carton, include the following:

• Statement of the problem or service needed. Be specific. Include the name and

telephone number of a knowledgeable technician for consultation.

• The part number, serial number, return address, and purchase order number.

6. Seal the carton using gummed tape.

7. Address the carton to:

FLUKE CALIBRATION

10311 WESTPARK DRIVE

HOUSTON, TX 77042

USA

7-2

Preparation for Storage & Shipment

Shipping 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.)

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.

Figure 7-1. Packing the PPI

glc37.bmp

7-3

RUSKA 7050, 7050i & 7050LP

Users Manual

7-4

Uncertainty Analysis

To perform an Uncertainty Analysis on a measurement device, you must be able to
identify all of the parameters that influence the measurement. You must be able to
quantify the magnitude of the potential error source and combine these into an overall
uncertainty statement.

To determine the expanded uncertainty on any manufacturers pressure Transfer Standard
(TS), you must identify the following four primary influences;

1. Performance specifications of the TS

Appendix A

Summary of Specifications

2. Long term Stability of TS

3. Uncertainty of the standard used to calibrate the TS

4. Environmental or installation influences that could cause errors in the TS

Performance Specifications

Performance specifications are the short-term measurement properties of the device.
These traditionally include linearity, hysteresis, and repeatability properties of the
transfer standard. There often is considerable confusion with the performance
specification because different manufacturers use different terms to describe the
performance characteristics of their instruments. The two most common terms used are
“Accuracy” and “Precision”. In both cases, as a minimum the manufacturers define these
terms to be the combined effects of linearity, hysteresis and repeatability. Since the
manufacturer defined the terms they used, this should not be a problem. However, it is
common that the users definition of these terms differ from the manufacturers and
therefore cause considerable confusion. For instance, the user may believe that the term
“Accuracy” includes all sources of uncertainty. This would include items 1 through 4
listed above which would be an all encompassing specification. The manufacturer may
define “Accuracy” as the performance specification which consists only of item 1 above.
The result would be that the instrument would not be capable of meeting the user’s
application because it would not meet the users definition of “Accuracy”.

Long Term Stability

Long term stability defines how the instrument drifts with time. This specification can be
utilized to define the calibration interval for the standard. Some manufacturers will
provide more than one stability specification for their instrument based on different
calibration time intervals. It is important to understand that you should not arbitrarily
vary the manufacturers stability specification based on time without knowing the

A-1

RUSKA 7050, 7050i & 7050LP

Users Manual

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 drifted in a sinusoidal fashion. This would suggest that the sensor
could drift to its maximum stability limit at any time and therefore, reducing the
calibration interval would not improve the expanded uncertainty of the device.

Uncertainty of the Standard

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 manufacturer’s calibration uncertainty that was used in the original uncertainty
analysis.

Environmental or Installation Influences

Environmental or Installation Influences that could cause errors in the transfer standard
includes influences such as ambient temperature, line pressure, head pressure, time
response, and controller effects. (It may include other influences that are very specific to
one manufacturer’s instrument.) It is recommended that the intended application is
reviewed to assure that the environmental does not impact the instruments performance,
or that the impact from the environment is accounted for in the uncertainty analysis. For
instance, if an instrument has a 0.001%FS per 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

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. 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).

A-2

Summary of Specifications

Uncertainty Analysis A

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 Calibration publishes are at the 2 sigma level which would be at a 95%
confidence level. Some manufacturers may state their uncertainty at different confidence
level and therefore, you would need to be able to convert from one to the other in order to
compare the two devices. For instance, if a manufacturer states that they have an
uncertainty of 0.005% FS and that the uncertainty is expressed at the 1 sigma level, then
it would be doubled to express it at the 2 sigma level (i.e. it would be an 0.01% FS device
at a 2 sigma or 95% confidence level.)

The following two tables are uncertainty analysis examples for a 7050i based on a three
month and a yearly calibration.

Table A-1. Uncertainty Analysis for 7050i—Three Month Analysis

Uncertainty Analysis – 3 Month Calibration Interval

RUSKA 7050i from 25 to 100% of Range

A. Performance – (Linearity, Hysteresis, Repeatability and Temperature) 0.005% of Reading

B. Stability – (3 months) 0.0019% of Reading per 90 days

C. Calibration Standard – (RUSKA 2465 DWG) 0.0010% of Reading

D. Environmental –

Temperature (Included in A. above) 0.000% of Reading

Head Pressure 0.001% of Reading

2 sigma Expanded Uncertainty (RSS) 0.0055% of Reading per 90 days

Table A-2. Uncertainty Analysis for 7050i—One Year Analysis

Uncertainty Analysis – One Year

RUSKA 7050i from 5 to 100% of Range

A. Performance – (Linearity, Hysteresis, Repeatability and Temperature) 0.005% of Reading

B. Stability – (1 year) 0.0075% of Reading / year

C. Calibration Standard – (RUSKA 2465 DWG) 0.0010% of Reading

D. Environmental –

Calibration Interval

Uncertainty

(2 sigma)

Uncertainty

(2 sigma)

Temperature (Included in A. above) 0.000% of Reading

Head Pressure 0.001% of Reading

2 sigma Expanded Uncertainty (RSS) 0.009% of Reading per year

A-3

RUSKA 7050, 7050i & 7050LP

Users Manual

The following two tables are uncertainty analysis examples for a single range 7050 based
on a three month and a yearly calibration.

Table A-3. Uncertainty Analysis for 7050—Three Month Analysis

Uncertainty Analysis – 3 Month

RUSKA 7050

A. Performance – (Linearity, Hysteresis, Repeatability and Temperature) 0.003% of Full Scale

B. Stability – (3 months) 0.0019% of Reading per 90 days

C. Calibration Standard – (RUSKA 2465 DWG) 0.0010% of Reading

D. Environmental –

Temperature (Included in A. above) 0.000% of Reading

Head Pressure 0.001% of Reading

2 sigma Expanded Uncertainty (RSS) 0.003% of Full Scale RSS with

Table A-4. Uncertainty Analysis for 7050—One Year Analysis

Uncertainty Analysis – One Year

RUSKA 7050

A. Performance – (Linearity, Hysteresis, Repeatability and Temperature) 0.003% of Full Scale

B. Stability – (1 year) 0.0075% of Reading / year

Calibration Interval

Calibration Interval

Uncertainty

(2 sigma)

0.0024% of Reading per
3 months

Uncertainty

(2 sigma)

C. Calibration Standard – (RUSKA 2465 DWG) 0.0010% of Reading

D. Environmental –

Temperature (Included in A. above) 0.000% of Reading

Head Pressure 0.001% of Reading

2 sigma Expanded Uncertainty (RSS) 0.003% of Full Scale RSS with

0.0076% of Reading per year

A-4

Summary of Specifications

Specifications A

Specifications

General Specifications

Pressure Range: Minimum: 0 to 5 (0 to 700 mbar)
Maximum: 0 to 3000 psi (0 to 200 bar)

Display 6.4 inch, TFT Active Matrix Color

Display Resolution User-selectable up to 1:1,000,000

Electrical Power 100–120/220–240 VAC 50/60 Hz Single Phase, 150 W

Operating Temperature 18 °C – 36 °C

Storage Temperature –20 °C – 70 °C

Humidity 5% – 95% relative humidity, non-condensing

Dimensions: 7" H x 16.5" W x 19" D (17.8 cm x 41.9 cm x 48.3 cm)

Weight 7250i 16 lb (7.25 kg)

Standard Pressure Units inHg at 0 °C and 60 °F, kPa, bar, psi, inH

25 °C, kg/cm

Pneumatic Ports

1

/4-inch NPT female

2

, mmHg at 0 °C, cmHg at 0 °C, and cmH2O at 4 °C

O at 4 oC, 20, and

2

Relief Valves Test Port: 120% of Maximum Scaled Quartz Sensor Range
Reference: 10 Psig (where applicable)

Ingress Protection: IP-20, Indoor use, Altitude <2000 in

EMC: EN 61326

Electrical Safety: EN 61010

Pressure Safety: Pressure Equipment Directive 97/23/EC-class,
Sound Engineering Practice (SEP)

Interface: IEEE 488 and RS232

A-5

RUSKA 7050, 7050i & 7050LP

Users Manual

Performance

7050 7050i 7050LP

Table A-5. Performance Specifications

Precision1 0.003% FS From 25% to 100% FS: 0.005% RDG

0.005% of each Range

Below 25%FS: 0.005% of 25%FS

Stability 0.0019% RDG/ 3 months or 0.0075% RDG/year

Zero Drift2 <0.004%FS / 24hrs <0.002%FS / 24hrs <0.004%FS / 24hrs

Options

Neg. Gauge

Precison

0.003% of max

1

positive FS

Greater of 0.005% of 25%FS or

0.0005 psi (3.5 Pa)

0.005% of max FS

(Optional 0.005% of

each range)

Barometric
Reference

Vacuum

Reference

1

Precision is defined as the combined effect of linearity, repeatability, and hysteresis throughout the

0.002 psi / year

3

(14 Pa / year)

0.002 psi / year

3

(1.33 Pa / year)

0.002 psi / year

(14 Pa / year)

0.002 psi / year

(1.33 Pa / year)

N/A

N/A

operating temperature range. Some manufacturers use the word “Accuracy” in place of “Precision”,
however the meaning is identical.

2

Zero drift typically improves with sensor age.

3

Requires Additional Uncertainty when operating in 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

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 Description and Corrective Action

0 No Error.

-103 Invalid Separator. Check punctuation in the SCPI command.

Appendix B

-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.

-113 Command Unknown. The command specified does not exist.

-114 Header Suffix. The numeric suffix for the command name is out of range.

-221 Settings Conflict. The command could not be executed due to the current
state of the DPC. 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 is 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 set-point is out of range.

-313 Calibration Data Lost. The calibration data has been lost and the unit must
be recalibrated.

B-1

7050, 7050i & 7050LP

Users Manual

Summary of Error Messages, cont.

Value Description and Corrective Action

-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. The pressure was greater than the high limit.

502 Low Limit Exceeded. The pressure was less that the low limit.

503 Slew limit Exceeded. The pressure changed faster than the slew limit

allowed.

521 Pressure Overrange. The pressure reading is outside the range of the PPI.

531 Oven Temp Overrange. Either the transistor that drives the heater for the

quartz Bourdon tube sensor (Chapter 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 (Chapter 7) if necessary.

533 Case Pressure Overrange. Select OK, then reduce the pressure at the case

reference port to 30 psia or lower.

540 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.

542 Oven Control Failure. The temperature controller is unable to keep the

sensor at the proper temperature.

545 Sensor Communication Error. Unable to Communicate with 7215xi Sensor

546 Sensor Calibration Lost. The 7215xi sensor has lost its calibration and must

be recalibrated.

600 Factory Data Lost. Internal factory constants have been lost. Contact Fluke

for more information.

601 Calibration Mode. The Calibrate button must be pressed before SCPI

calibration commands can be executed.

800 Solenoid Over-Temperature. The control solenoids have over-heated. Wait

until they have cooled before entering Control mode.

801 Error reading Barometric RPT Pressure Sensor

802 Control Sensor out of range

803 Controller Communication Error

804 Autotune Failed

B-2