VXI VT1422A, VT1529A-B User Manual

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VT1422A Remote Channel Multi-Function DAC Module

with VT1529A/B 32 Ch Remote Strain Conditioning Unit and VT1539A Remote Channel Signal Conditioning Plug-On

User’s and SCPI Programming Manual

Where to Find it - Online and Printed Information

Module configuration and wiring....................... This Manual

SCPI programming.............................................This Manual

SCPI example programs.....................................This Manual, Driver Disc

SCPI command reference ..................................This Manual

VXIplug&play programming ............................VXIplug&play Online Help

VXIplug&play example programs........... ..........VXIplug&play Online Help

VXIplug&play function reference ........... ... .......VXIplug&play Online Help

Soft Front Panel information..............................VXIplug&play Online Help

VISA language information...............................VISA User's Guide

VEE programming information ......................... VEE User's Manual

Manual Part Number: 82-0076-000 Printed in U.S.A. August 15, 2005

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VXI TECHNOLOGY WARRANTY STATEMENT

PRODUCT: VT1422A Remote Channel Multi-function DAC Module, DURATION OF WARRANTY: 3 years

1. VXI Technology warrants VXI Technology hardware, accessories, and supplies against defects in materials and workmanship for the period specified above. If VXI Technology receives notice of such defects during the warranty period, VXI Technology will, at its option, either repair or replace products which prove to be defective. Replacement products may be either new or like-new.

2. VXI Technology warrants that VXI Technology software will not fail to execute its programming instructions, for the period specified above, due to defects in material and workmanship when properly installed and used. If VXI Technology receives notice of such defects during the warranty period, VXI Technology will replace software media which does not execute its programming instructions due to such defects.

3. VXI Technology does not warrant that the operation of VXI Technology products will be interrupted or error free. If VXI Technology is unable, within a reasonable time, to repair or replace any product to a condition as warranted, customer will be entitled to a refund of the purchase price upon prompt return of the product.

4. VXI Technology products may contain remanufactured parts equivalent to new in performance or may have been subject to incidental use.

5. The warranty period begins on the date of delivery or on the date of installation if installed by VXI Technology. If customer schedules or delays VXI Technology installation more than 30 days after delivery, warranty begins on the 31st day from delivery.

6. Warranty does not apply to defects resulting from (a) improper or inadequate maintenance or calibration, (b) sof tware, interfacing, parts or supplies not supplied by VXI Technology, (c) unauthorized modification or misuse, (d) operation outside of the published environmental specifications for the product, or (e) improper site preparation or maintenance.

7. TO THE EXTENT ALLOWED BY LOCAL LAW, THE ABOVE WARRANTIES ARE EXCLUSIVE AND NO OTHER WARRANTY OR CONDITION, WHETHER WRITTEN OR ORAL, IS EXPRESSED OR IMPLIED AND VXI TECHNOLOGY SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OR CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, AND FITNESS FOR A PARTICULAR PURPOSE.

8. VXI Technology will be liable for damage to tangible property per incident up to the greater of $300,000 or the actual amount paid for the product that is the subject of the claim and for damages for bodily injury or death, to the extent that all such damages are determined by a court of competent jurisdiction to have been directly caused by a defective VXI Technology product.

9. TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES IN THIS WARRANTY STATEMENT ARE CUSTOMER’S SOLE AND EXLUSIVE REMEDIES. EXCEPT AS INDICATED ABOVE, IN NO EVENT WILL VXI TECHNOLOGY OR ITS SUPPLIERS BE LIABLE FOR LOSS OF DATA OR FOR DIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL (INCLUDING LOST PROFIT OR DATA), OR OTHER DAMAGE, WHETHER BASED IN CONTRACT, TORT, OR OTHERWISE.

FOR CONSUMER TRANSACTIONS IN AUSTRALIA AND NEW ZEALAND: THE WARRANTY TERMS CONTAINED IN THIS STATEMENT, EXCEPT TO THE EXTENT LAWFULLY PERMITTED, DO NOT EXCLUDE, RESTRICT OR MODIFY AND ARE IN ADDITION TO THE MANDATORY STATUTORY RIGHTS APPLICABLE TO THE SALE OF THIS PRODUCT TO YOU.

VT1529A/B Remote Strain Conditioning Module, VT1539A Remote Channel Signal Conditioning Plug-on, and all other applicable Signal Conditioning Plug-ons

U.S. Government Restricted Rights

The Software and Documentation have been developed entirely at private expense. They are delivered and licensed as "commercial computer software" as defined in DFARS 252.227- 7013 (Oct 1988), DFARS 252.211-7015 (May 1991), or DFARS 252.227-7014 (Jun 1995), as a "commercial item" as defined in FAR 2.101(a) or as "Restricted computer software" as defined in FAR 52.227-19 (Jun 1987) (or any equivalent agency regulation or contract clause), whichever is applicable. You have only those rights provided for such Software and Documentation by the applicable FAR or DFARS clause or th e

VT1422A Remote Channel Multi-Function DAC Module User's and SCPI Programming Manual

VXI Technology standard software agreement for the product involved.

Safety Symbols

product. Indicates that the user must refer to

Alternating current (ac)Instruction manual symbol affixed to

the manual for specific WARNING or CAUTION information to avoid personal

Direct current (dc).

injury or damage to the product.

Indicates hazardous voltages. Indicates the field wiring terminal that must be connected to earth ground before operating the equipment—protects against electrical shock in case of fault.

WARNING

Calls attention to a procedure, practice,

or condition that could cause bodily injury

or death.

Calls attention to a procedure, practice or

Frame or chassis ground terminal— typically connects to the equipment's metal

CAUTION

condition that could possibly cause damage

to equipment or permanent loss of data.

WARNINGS

The following general safety precautions must be observed during all phases of operation, service, and repair of this product. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the product. VXI Technology assumes no liability for the customer's failure to comply with these requirements.

Ground the equipment: For Safety Class 1 equipment (equipment having a protective earth terminal), an uninterruptible safety earth ground must be provided from the mains power source to the product input wiring terminals or supplied power cable.

DO NOT operate the product in an explosive atmosphere or in the presence of flammable gases or fumes.

For continued protection against fire, replace the line fuse(s) only with fuse(s) of the same voltage and current rating and type. DO NOT use repaired fuses or short-circuited fuse holders.

Keep away from live circuits: Operating personnel must not remove equipment covers or shields. Procedures involving the removal of covers or shields are for use by service-trained personnel only. Under certain conditions, dangerous voltages may exist even with the equipment switched off. To avoid dangerous electrical shock, DO NOT perform procedures involving cover or shield removal unless you are qualified to do so.

DO NOT operate damaged equipment: Whenever it is possible that the safety protection features built into this product have been impaired, either through physical damage, excessive moisture or any other reason, REMOVE POWER and do not use the product until safe operation can be verified by service-trained personnel. If necessary, return the product to to ensure that safety features are maintained.

DO NOT service or adjust alone: Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.

DO NOT substitute parts or modify equipment: Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the product. Return the product to VXI Technology for service and repair to ensure that safety features are maintained.

Operating Location: Sheltered location where air temperature and humidity are controlled within th is product’s specifications and the product is protected against direct exposure to climatic conditions such as direct sunlight, wind, rain, snow, sleet and icing, water spray or splash, hoarfrost or dew (typically, indoor). Pollution environment for which this product may be operated is IEC 664 Pollution degree 2.

VXI Technology for service and repair

Cleaning the front panel and top/bottom Shields: Clean the outside surfaces of this module with a cloth slightly dampened with water . Do not attempt to clean the interior of this module.

Note for European Customers

If this symbol appears on your product, it indicates that it was manufactured after August 13, 2005. This mark is placed in accordance with EN 50419, Marking of electrical and electronic equipment in accordance with Article 11(2) of directive 2002/96/EC (WEEE). End-of-life product can be returned to VTI by obtaining an RMA number. Fees for recycling will apply if not prohibited by national law. SCP cards for use with the VT1422A have this mark placed on their packaging due to the densely populated nature of these cards.

DECLARATION OF CONFORMITY

According to ISO/IEC Guide 22 and CEN/CENELEC EN 45014

Manufacturer’s Name: VXI Technology, Inc. Manufacturer’s Address: 2031 Main Street

Irvine, California 92614 USA

Declares, that the product

Product Name: Remote Channel Multi-function DAC Module Model Number: VT1422A Product Options: This declaration covers all options of the above product(s).

Conforms with the following European Directives:

The product herewith complies with the requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC (including 93/68/EEC) and carries the CE Marking accordingly.

Conforms with the following product standards:

EMC Standard Limit

Safety

IEC 61326-1:1997+A1:1998 / EN 61326-1:1997+A1:1998 CISPR 11:1990 / EN 55011:1991 IEC 61000-4-2:1995+A1:1998 / EN 61000-4-2:1995 IEC 61000-4-3:1995 / EN 61000-4-3:1995 IEC 61000-4-4:1995 / EN 61000-4-4:1995 IEC 61000-4-5:1995 / EN 61000-4-5:1995 IEC 61000-4-6:1996 / EN 61000-4-6:1996 IEC 61000-4-11:1994 / EN 61000-4-11:1994

Canada: ICES-001:1998 Australia/New Zealand: AS/NZS 2064.1

The product was tested in a typical configuration with VXI Technology test systems. IEC 61010-1:1990+A1:1992+A2:1995 / EN 61010-1:1993+A2:1995

Canada: CSA C22.2 No. 1010.1:1992 UL 3111-1: 1994

Group 1 Class A

4kV CD, 8kV AD

3 V/m, 80-1000 MHz

0.5kV signal lines, 1kV power lines

0.5 kV line-line, 1 kV line-ground

3V, 0.15-80 MHz

Dips: 30% 10ms; 60% 100 ms

Interrupt > 95%@5000 ms

15 March 2002 Date

Steve Mauga Quality Assurance Manager

DECLARATION OF CONFORMITY

According to ISO/IEC Guide 22 and CEN/CENELEC EN 45014

Manufacturer’s Name: VXI Technology, Inc. Manufacturer’s Address: 2031 Main Street

Irvine, California 92614 USA

Declares, that the product

Product Name: Remote Strain Conditioning Unit Model Number: VT1529A, VT1529B Product Options: This declaration covers all options of the above product(s).

Conforms with the following European Directives:

The product herewith complies with the requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC (including 93/68/EEC) and carries the CE Marking accordingly.

Conforms with the following product standards:

EMC Standard Limit

Safety

Canada ICES-001 Australia AS/NZS/2064 Russia GOST 23450-79 Czech Republic CSN EN55011 Hungary MSZ EN55011

The product was tested in a typical configuration with VXI Technology test systems. IEC 61010-1:1990+A1:1992+A2:1995 / EN 61010-1:1993+A2:1995

Canada: CSA C22.2 No. 1010.1:1992 UL 3111-1

Group 1 Class A

4kV CD, 8kV AD

3 V/m, 80-1000 MHz

0.5kV signal lines, 1kV power lines

0.5 kV line-line, 1 kV line-ground

3V, 0.15-80 MHz I cycle, 100%

Dips: 30% 10 ms; 60% 100 ms

Interrupt > 95%@5000 ms

15 March 2002 Date

Steve Mauga Quality Assurance Manager

DECLARATION OF CONFORMITY

According to ISO/IEC Guide 22 and CEN/CENELEC EN 45014

Manufacturer’s Name: VXI Technology, Inc. Manufacturer’s Address: 2031 Main Street

Irvine, California 92614 USA

Declares, that the product

Product Name: Remote Channel Signal Conditioning Plug-on Model Number: VT1539A Product Options: This declaration covers all options of the above product(s).

Conforms with the following European Directives:

The product herewith complies with the requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC (including 93/68/EEC) and carries the CE Marking accordingly.

Conforms with the following product standards:

EMC Standard Limit

IEC 61326-1:1997+A1:1998 / EN 61326-1:1997+A1:1998

Canada ICES-001:1998 Australia/New Zealand AS/NZS/2064.1 Russia GOST 23450-79 Czech Republic CSN EN 55011 Hungary MSZ EN 55011

The product was tested in a typical configuration with VXI Technology test systems.

Safety

IEC 61010-1:1990+A1:1992+A2:1995 / EN 61010-1:1993+A2:1995 Canada: CSA C22.2 No. 1010.1:1992 UL 3111-1: 1994

30 July 2001 Date

Steve Mauga Quality Assurance Manager

Notes:

VT1422A Remote Channel Multi-function DAC Module

Warranty Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

U.S. Government Restricted Rights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Support Resources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Chapter 1

Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

About this Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Configuring the VT1422A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Setting the Logical Address Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Installing Signal Conditioning Plug-Ons . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Disabling the Input Protect Feature (Optional) . . . . . . . . . . . . . . . . . . . . . . 29

Disabling Flash Memory Access (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Installing the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Instrument Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

About Example Programs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Verifying a Successful Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Chapter 2

Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Planning the Wiring Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

SCP Positions and Channel Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Sense SCPs and Output SCPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Planning for Thermocouple Measurements . . . . . . . . . . . . . . . . . . . . . . . . . 38

Faceplate Connector Pin-Signal Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Optional Terminal and Connector Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

The SCPs and Terminal Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Terminal Module Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

The RJ-45 Connector Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Spring Terminal Module Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Screw Terminal Module Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Reference Temperature Sensing with the VT1422A . . . . . . . . . . . . . . . . . . . . . . 44

Preferred Measurement Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Connecting the On-Board Thermistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Wiring and Attaching the Terminal Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Removing the VT1422A Terminal Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Contents 9

Attaching and Removing the VT1422A RJ-45 Module . . . . . . . . . . . . . . . . . . . . 53

Adding Components to the Terminal Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Spring and Screw Terminal Module Wiring Maps . . . . . . . . . . . . . . . . . . . . . . . 55

Chapter 3

Programming the VT1422A & VT1529A/B for Remote Strain Measurement . . . 57

About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Instrument Setup for Remote Strain Measurements . . . . . . . . . . . . . . . . . . . . . . 58

Preparing the VT1422A for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Preparing the VT1529A/B for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Installing User Selected 1/4 Bridge Resistors (Optional) . . . . . . . . . . . . . . . 59

Connecting VT1529A/Bs to the VT1422A . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Two Interconnect Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Connecting Excitation Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Connecting the VT1529A/B to Strain Gages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Channel Connector Pin-to-Signal Relationship . . . . . . . . . . . . . . . . . . . . . . 69

VT1529A/B Bridge Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Connecting to the VT1529A/Bs Dynamic Strain Ports . . . . . . . . . . . . . . . . . . . . 73

Extending the Dynamic Strain Connection . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Dynamic Strain Port Offset Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Remote Strain Channel Addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Runtime Remote Scan Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Programming for Remote Strain Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . 78

Description of Strain Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Verifying Correct Bridge Completion (Shunt Cal) . . . . . . . . . . . . . . . . . . . . . . . 90

Built-in Strain Conversion Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Chapter 4

Programming the VT1422A for

Data Acquisition and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

About This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Overview of the VT1422A Multifunction DAC Module . . . . . . . . . . . . . . . . . . . 96

Multifunction DAC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Operational Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Detailed Instrument Operation Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Executing the Programming Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Power-on and *RST Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Setting up Analog Input and Output Channels . . . . . . . . . . . . . . . . . . . . . . . . . 107

Configuring Programmable Analog SCP Parameters . . . . . . . . . . . . . . . . 107

Linking Input Channels to EU Conversion . . . . . . . . . . . . . . . . . . . . . . . . . 109

Linking Output Channels to Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Setting Up Digital Input and Output Channels . . . . . . . . . . . . . . . . . . . . . . . . . 118

Setting Up Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Setting Up Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

10 Contents

Performing Channel Calibration (Important!). . . . . . . . . . . . . . . . . . . . . . . . . . 122

Calibrating the VT1422A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Calibrating Remote Signal Conditioning Units . . . . . . . . . . . . . . . . . . . . . . 123

Defining an Analog Input Scan List (ROUT:SEQ:DEF). . . . . . . . . . . . . . . . . . 123

Defining C Language Algorithms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Global Variable Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Algorithm Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Pre-setting Algorithm Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Defining Data Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Specifying the Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Selecting the FIFO Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Setting up the Trigger System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Arm and Trigger Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Programming the Trigger Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Setting the Trigger Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Sending Trigger Signals to Other Instruments . . . . . . . . . . . . . . . . . . . . . . 131

INITiating the Module/Starting Scanning and Algorithms. . . . . . . . . . . . . . . . 132

Starting Scanning and/or Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

The Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Reading Running Algorithm Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Modifying Running Algorithm Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Updating Algorithm Variables and Coefficients . . . . . . . . . . . . . . . . . . . . . 138

Enabling and Disabling Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Setting Algorithm Execution Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Example SCPI Command Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Example VXIplug&play Driver Function Sequence . . . . . . . . . . . . . . . . . . . . . 140

Using the Status System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Enabling Events to be Reported in the Status Byte . . . . . . . . . . . . . . . . . . 145

Reading the Status Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Clearing the Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

The Status Byte Group’s Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . 147

Reading Status Groups Directly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

VT1422A Background Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Updating the Status System and VXIbus Interrupts . . . . . . . . . . . . . . . . . . . . . 149

Creating and Loading Custom EU Conversion Tables . . . . . . . . . . . . . . . . . . . 150

Compensating for System Offsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Special Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

Detecting Open Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

More On Auto Ranging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

Settling Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Checking for Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Fixing the Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Contents 11

Chapter 5

Advanced Programming with the VT1529B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Additional Capabilities of the VT1529B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Changes to the Use Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Engineering Units Conversion Done in VXIplug&play Driver . . . . . . . . . 162

Must Count writefifo Calls in Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . 163

New SCPI Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Strain Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Field Wiring for Excitation Measurements . . . . . . . . . . . . . . . . . . . . . . . . . 165

Strain Measurement Command Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Strain Conversion Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Alternate Method of Computing Strain . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Temperature Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Connecting the VT1586A to the VT1529B . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Field Wiring of the VT1586A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

Temperature Measurement Command Sequence . . . . . . . . . . . . . . . . . . . . 174

Temperature Conversion Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Voltage Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Field Wiring for dc Voltage Measurements . . . . . . . . . . . . . . . . . . . . . . . . . 176

DCV Measurement Command Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

DCV Measurement Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Settling Time Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Chapter 6

Creating and Running Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Overview of the Algorithm Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Example Language Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

The Algorithm Execution Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

The Main Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

How User Algorithms Fit In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

Accessing the VT1422A's Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Accessing I/O Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Accessing Remote Scan Status Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Runtime Remote Scan Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Defining and Accessing Global Variables . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Determining First Execution (First_loop) . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Initializing Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Sending Data to the CVT and FIFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Setting a VXIbus Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

Determining An Algorithm's Identity (ALG_NUM) . . . . . . . . . . . . . . . . . 193

Calling User Defined Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

Operating Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Overall Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Algorithm Execution Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

12 Contents

Defining Algorithms (ALG:DEF). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

ALG:DEFINE in the Programming Sequence . . . . . . . . . . . . . . . . . . . . . . 196

ALG:DEFINE's Three Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

Changing a Running Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197

A Very Simple First Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Writing the Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Running the Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Modifying an Example PID Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

PIDA with Digital On-Off Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Algorithm to Algorithm Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Communication Using Channel Identifiers . . . . . . . . . . . . . . . . . . . . . . . . . 201

Communication Using Global Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Non-Control Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

Process Monitoring Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

Implementing Setpoint Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

Algorithm Language Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Standard Reserved Keywords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Special VT1422A Reserved Keywords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Identifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Special Identifiers for Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

Special Identifiers for Remote Scan Status . . . . . . . . . . . . . . . . . . . . . . . . . 208

Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

Intrinsic Functions and Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

Program Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

Data Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

Bitfield Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212

Language Syntax Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

Program Structure and Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

Declaring Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

Assigning Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

The Operations Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

Conditional Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

Comment Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

Overall Program Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

Chapter 7

VT1422A Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

Using This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

Overall Command Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

Command Fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

Common Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

SCPI Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

Linking Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234

Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

SCPI Command Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

ABORt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

Contents 13

ALGorithm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

ALGorithm[:EXPLicit]:ARRay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

ALGorithm[:EXPLicit]:ARRay? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

ALGorithm[:EXPLicit]:DEFine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

ALGorithm[:EXPLicit]:SCALar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244

ALGorithm[:EXPLicit]:SCALar? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

ALGorithm[:EXPLicit]:SCAN:RATio . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

ALGorithm[:EXPLicit]:SCAN:RATio? . . . . . . . . . . . . . . . . . . . . . . . . . . . 246

ALGorithm[:EXPLicit]:SIZE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246

ALGorithm[:EXPLicit][:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

ALGorithm[:EXPLicit][:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

ALGorithm[:EXPLicit]:TIME? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

ALGorithm:FUNCtion:DEFine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

ALGorithm:OUTPut:DELay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

ALGorithm:OUTPut:DELay? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251

ALGorithm:UPDate[:IMMediate] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252

ALGorithm:UPDate:CHANnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

ALGorithm:UPDate:WINDow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254

ALGOrithm:UPDate:WINDow? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

ARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256

ARM[:IMMediate] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

ARM:SOURce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

ARM:SOURce? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

CALCulate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259

CALCulate:TEMPerature:THERmistor? . . . . . . . . . . . . . . . . . . . . . . . . . . 259

CALCulate:TEMPerature:TCouple? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

CALibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

CALibration:CONFigure:RESistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263

CALibration:CONFigure:VOLTage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

CALibration:REMote? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

CALibration:REMote:DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

CALibration:REMote:DATA? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

CALibration:REMote:STORe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

CALibration:SETup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268

CALibration:SETup? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268

CALibration:STORe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

CALibration:TARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270

CALibration:TARE:RESet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

CALibration:TARE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

CALibration:VALue:RESistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

CALibration:VALue:VOLTage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

CALibration:ZERO? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

DIAGnostic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276

DIAGnostic:CALibration:SETup[:MODE] . . . . . . . . . . . . . . . . . . . . . . . . 277

DIAGnostic:CALibration:SETup[:MODE]? . . . . . . . . . . . . . . . . . . . . . . . 277

DIAGnostic:CALibration:TARE[:OTDetect]:MODE . . . . . . . . . . . . . . . . 278

DIAGnostic:CALibration:TARE[:OTDetect]:MODE? . . . . . . . . . . . . . . . 278

DIAGnostic:CHECksum? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

DIAGnostic:CONNect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

DIAGnostic:CUSTom:MXB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280

14 Contents

DIAGnostic:CUSTom:PIECewise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

DIAGnostic:CUSTom:REFerence:TEMPerature . . . . . . . . . . . . . . . . . . . 282

DIAGnostic:IEEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

DIAGnostic:IEEE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

DIAGnostic:INTerrupt[:LINe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

DIAGnostic:INTerrupt[:LINe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

DIAGnostic:OTDetect[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284

DIAGnostic:OTDetect[:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285

DIAGnostic:QUERy:SCPREAD? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285

DIAGnostic:REMote:USER:DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286

DIAGnostic:REMote:USER:DATA? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286

DIAGnostic:TEST:REMote:NUMber? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

DIAGnostic:TEST:REMote:SELFtest? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288

DIAGnostic:VERSion? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290

FETCh?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

FORMat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

FORMat[:DATA] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

FORMat[:DATA]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295

INITiate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

INITiate[:IMMediate] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

INPut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

INPut:FILTer[:LPASs]:FREQuency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

INPut:FILTer[:LPASs]:FREQuency? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298

INPut:FILTer[:LPASs][:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

INPut:FILTer[:LPASs][:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

INPut:GAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300

INPut:GAIN? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

INPut:LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

INPut:LOW? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302

INPut:POLarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302

INPut:POLarity? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303

MEASure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304

MEASure:VOLTage:EXCitation? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304

MEASure:VOLTage:UNSTrained? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306

MEMory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

MEMory:VME:ADDRess . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309

MEMory:VME:ADDRess? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309

MEMory:VME:SIZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

MEMory:VME:SIZE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

MEMory:VME:STATe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311

MEMory:VME:STATe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311

OUTPut. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312

OUTPut:CURRent:AMPLitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312

OUTPut:CURRent:AMPLitude? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

OUTPut:CURRent[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314

OUTPut:CURRent[:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315

OUTPut:POLarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315

OUTPut:POLarity? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316

OUTPut:SHUNt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316

OUTPut:SHUNt? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

Contents 15

OUTPut:SHUNt:SOURce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

OUTPut:SHUNt:SOURce? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318

OUTPut:TTLTrg:SOURce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319

OUTPut:TTLTrg:SOURce? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319

OUTPut:TTLTrg<n>[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320

OUTPut:TTLTrg<n>[:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320

OUTPut:TYPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321

OUTPut:TYPE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321

OUTPut:VOLTage:AMPLitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322

OUTPut:VOLTage:AMPLitude? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322

ROUTe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323

ROUTe:SEQuence:DEFine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323

ROUTe:SEQuence:DEFine? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325

ROUTe:SEQuence:POINts? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326

SAMPle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

SAMPle:TIMer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

SAMPle:TIMer? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329

[SENSe]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330

[SENSe:]DATA:CVTable? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331

[SENSe:]DATA:CVTable:RESet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333

[SENSe:]DATA:FIFO[:ALL]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333

[SENSe:]DATA:FIFO:COUNt? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334

[SENSe:]DATA:FIFO:COUNt:HALF? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334

[SENSe:]DATA:FIFO:HALF? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335

[SENSe:]DATA:FIFO:MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336

[SENSe:]DATA:FIFO:MODE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336

[SENSe:]DATA:FIFO:PART? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

[SENSe:]DATA:FIFO:RESet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338

[SENSe:]FREQuency:APERture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338

[SENSe:]FREQuency:APERture? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

[SENSe:]FUNCtion:CONDition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

[SENSe:]FUNCtion:CUSTom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340

[SENSe:]FUNCtion:CUSTom:HVOLtage . . . . . . . . . . . . . . . . . . . . . . . . . . 341

[SENSe:]FUNCtion:CUSTom:REFerence . . . . . . . . . . . . . . . . . . . . . . . . . . 342

[SENSe:]FUNCtion:CUSTom:TCouple . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343

[SENSe:]FUNCtion:FREQuency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344

[SENSe:]FUNCtion:HVOLtage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345

[SENSe:]FUNCtion:RESistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346

[SENSe:]FUNCtion:STRain:FBENding . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

[SENSe:]FUNCtion:STRain:FBPoisson . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

[SENSe:]FUNCtion:STRain:FPOisson . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

[SENSe:]FUNCtion:STRain:HBENding . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

[SENSe:]FUNCtion:STRain:HPOisson . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

[SENSe:]FUNCtion:STRain[:QUARter] . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

[SENSe:]FUNCtion:STRain:Q120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

[SENSe:]FUNCtion:STRain:Q350 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

[SENSe:]FUNCtion:STRain:USER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

[SENSe:]FUNCtion:STRain:FBENding:POST . . . . . . . . . . . . . . . . . . . . . . 349

[SENSe:]FUNCtion:STRain:FBPoisson:POST . . . . . . . . . . . . . . . . . . . . . . 349

[SENSe:]FUNCtion:STRain:FPOisson:POST . . . . . . . . . . . . . . . . . . . . . . 349

16 Contents

[SENSe:]FUNCtion:STRain:HBENding:POST . . . . . . . . . . . . . . . . . . . . . 349

[SENSe:]FUNCtion:STRain:HPOisson:POST . . . . . . . . . . . . . . . . . . . . . . 349

[SENSe:]FUNCtion:STRain[:QUARter]:POST . . . . . . . . . . . . . . . . . . . . . 349

[SENSe:]FUNCtion:STRain:Q120:POST . . . . . . . . . . . . . . . . . . . . . . . . . . 349

[SENSe:]FUNCtion:STRain:Q350:POST . . . . . . . . . . . . . . . . . . . . . . . . . . 349

[SENSe:]FUNCtion:STRain:USER:POST . . . . . . . . . . . . . . . . . . . . . . . . . 349

[SENSe:]FUNCtion:TEMPerature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351

[SENSe:]FUNCtion:TEMPerature:POST . . . . . . . . . . . . . . . . . . . . . . . . . . 353

[SENSe:]FUNCtion:TOTalize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

[SENSe:]FUNCtion:VOLTage[:DC] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

[SENSe:]REFerence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355

[SENSe:]REFerence:POST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357

[SENSe:]REFerence:CHANnels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

[SENSe:]REFerence:CHANnels:POST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

[SENSe:]REFerence:TEMPerature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359

[SENSe:]REFerence:TEMPerature:POST . . . . . . . . . . . . . . . . . . . . . . . . . 360

[SENSe:]REFerence:THERmistor:RESistance:POST . . . . . . . . . . . . . . . . 361

[SENSe:]REFerence:THERmistor:RESistance:POST? . . . . . . . . . . . . . . . 362

[SENSe:]STRain:BRIDge[:TYPE] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362

[SENSe:]STRain:BRIDge:[TYPE]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363

[SENSe:]STRain:CONNect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363

[SENSe:]STRain:CONNect? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364

[SENSe:]STRain:EXCitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364

[SENSe:]STRain:EXCitation? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365

[SENSe:]STRain:EXCitation:STATe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366

[SENSe:]STRain:EXCitation:STATe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366

[SENSe:]STRain:GFACtor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367

[SENSe:]STRain:GFACtor? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367

[SENSe:]STRain:POISson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368

[SENSe:]STRain:POISson? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368

[SENSe:]STRain:UNSTrained . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369

[SENSe:]STRain:UNSTrained? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369

[SENSe:]TOTalize:RESet:MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370

[SENSe:]TOTalize:RESet:MODE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371

SOURce. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372

SOURce:FM[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372

SOURce:FM:STATe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373

SOURce:FUNCtion[:SHAPe]:CONDition . . . . . . . . . . . . . . . . . . . . . . . . . . 373

SOURce:FUNCtion[:SHAPe]:PULSe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374

SOURce:FUNCtion[:SHAPe]:SQUare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374

SOURce:PULM[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374

SOURce:PULM:STATe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

SOURce:PULSe:PERiod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

SOURce:PULSe:PERiod? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376

SOURce:PULSe:WIDTh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376

SOURce:PULSe:WIDTh? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377

SOURce:VOLTage[:AMPLitude] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377

STATus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379

The Operation Status Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381

STATus:OPERation:CONDition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381

STATus:OPERation:ENABle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382

Contents 17

STATus:OPERation:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383

STATus:OPERation[:EVENt]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383

STATus:OPERation:NTRansition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384

STATus:OPERation:NTRansition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384

STATus:OPERation:PTRansition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385

STATus:OPERation:PTRansition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385

STATus:PRESet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386

The Questionable Data Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386

STATus:QUEStionable:CONDition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

STATus:QUEStionable:ENABle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

STATus:QUEStionable:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388

STATus:QUEStionable[:EVENt]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388

STATus:QUEStionable:NTRansition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389

STATus:QUEStionable:NTRansition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389

STATus:QUEStionable:PTRansition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390

STATus:QUEStionable:PTRansition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390

SYSTem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391

SYSTem:CTYPe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391

SYSTem:CTYPe:REMote? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391

SYSTem:ERRor? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392

SYSTem:VERSion? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392

TRIGger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393

TRIGger:COUNt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

TRIGger:COUNt? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

TRIGger[:IMMediate] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396

TRIGger:SOURce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396

TRIGger:SOURce? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397

TRIGger:TIMer[:PERiod] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397

TRIGger:TIMer[:PERiod]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 398

IEEE-488.2 Common Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399

*CAL? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399

*CLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400

*DMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400

*EMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400

*EMC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400

*ESE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401

*ESE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401

*ESR? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401

*GMC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401

*IDN? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402

*LMC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402

*OPC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402

*OPC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403

*PMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403

*RMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403

*RST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403

*SRE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404

*SRE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404

*STB? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405

*TRG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405

*TST? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405

*WAI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408

18 Contents

Command Quick Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409

Appendix A

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419

VT1422A Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419

VT1529A/B Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449

Appendix B

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453

Appendix C

VT1529A/B Verification & Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463

Recommended Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463

Dummy Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463

Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 464

Verification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 464

Test V-1: Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465

Test V-2: Cal Remote . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465

Test V-3: Sense Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 466

Test V-4: Bridge Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467

Test V-5: Dynamic Strain Output Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469

Test V-6: Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471

Test V-7: Shunt Cal Resistor Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 474

Test V-8: Internal Shunt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477

Appendix D

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479

Appendix E

Wiring and Noise Reduction Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483

Separating Digital and Analog SCP Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483

Recommended Wiring and Noise Reduction Techniques . . . . . . . . . . . . . . . . . 484

Wiring Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484

VT1422A Guard Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485

Common Mode Voltage Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485

When to Make Shield Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485

Noise Due to Inadequate Card Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485

VT1422A Noise Rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486

Normal Mode Noise (Enm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486

Common Mode Noise (Ecm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486

Keeping Common Mode Noise out of the Amplifier . . . . . . . . . . . . . . . . . . 486

Contents 19

Appendix F

Generating User Defined Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487

Haversine Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 488

Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 490

Appendix G

Example PID Algorithm Listings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491

PIDA Algorithm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491

PIDB Algorithm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493

PIDC Algorithm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 505

20 Contents

Support Resources

Support resources for this product are available on the Internet and at VXI Technology customer support centers.

VXI Technology World Headquarters

VXI Technology, Inc. 2031 Main Street Irvine, CA 92614-6509

Phone: (949) 955-1894 Fax: (949) 955-3041

VXI Technology Cleveland Instrument Division

VXI Technology, Inc. 7525 Granger Road, Unit 7 Valley View, OH 44125

Phone: (216) 447-8950 Fax: (216) 447-8951

VXI Technology Lake Stevens Instrument Division

VXI Technology, Inc. 1924 - 203 Bickford Snohomish, WA 98290

Phone: (425) 212-2285 Fax: (425) 212-2289

Technical Support

Phone: (949) 955-1894 Fax: (949) 955-3041 E-mail: support@vxitech.com

Visit http://vxitech.com for worldwide support sites and service plan information.

Support 21

22 Support

About this Chapter

This chapter will explain hardware configuration before installation in a VXIbus mainframe. By attending to each of these configuration items, the VT1422A won't have to be removed from its mainframe later. Chapter contents include:

• Configuring the VT1422A . . . . . . . . . . . . . . . . . . . . . . . . . . . page 23

• Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 31

• Instrument Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 31

• About Example Programs. . . . . . . . . . . . . . . . . . . . . . . . . . . . page 31

• Verifying a Successful Configuration. . . . . . . . . . . . . . . . . . . page 32

Configuring the VT1422A

There are several aspects to configuring the module before installing it in a VXIbus mainframe. They are:

Chapter 1

Getting Started

• Setting the Logical Address Switch . . . . . . . . . . . . . . . . . . . . page 24

• Installing Signal Conditioning Plug-Ons . . . . . . . . . . . . . . . . page 25

• Disabling the Input Protect Feature (Optional). . . . . . . . . . . . page 29

• Disabling Flash Memory Access (Optional). . . . . . . . . . . . . . page 29

For most applications, only the Logical Address switch needs to be changed prior to installation. The other settings can be used as delivered.

Switch/Jumper Setting

Logical Address Switch 208 Input Protect Jumper Protected Flash Memory Protect Jumper PROG

Note Setting the VXIbus Interrupt Level: The VT1422A uses a default VXIbus

interrupt level of 1. The default setting is made at power-on and after an *RST command. The interrupt level can be changed by executing the DIAGnostic:INTerrupt[:LINe] command in the application program.

Getting Started 23Chapter 1

Setting the Logical

Address Switch

Follow the next figure and ignore any switch numbering printed on the Logical Address switch. When installing more than one VT1422A in a single VXIbus Mainframe, set each instrument to a different Logical Address.

Setting the Logical Address Switch

Default Switch Setting

Logical Address = 208

24 Getting Started Chapter 1

Installing Signal

Conditioning

Plug-Ons

The following illustrations show the steps used to install Signal Conditioning Plug-ons (SCPs). Before installing an SCPs, reading the "Separating Digital and Analog SCP Signals" in Appendix E page 483 is recommended.

Caution Use approved Static Discharge Safe handling procedures

anytime the covers are removed from the VT1422A or when handling the SCPs.

Installing SCPs: Step 1, Removing the Cover VT1422A

Remove the SCP

Retaining Screws

Remove2screws(#10Torx);

lift front and slide out tabs

Getting Started 25Chapter 1

Installing SCPs: Step 2, Mounting an SCP

CAUTION

Use approved Static

Discharge handling

procedures when handling the

VT1422A Multifunction DAC

Modules and the SCPs

Align the SCP

connectors with the

Module connectors

and then

ush in

SCP

Tighten the SCP

Retaining Screws

26 Getting Started Chapter 1

Installing SCPs: Step 3, Reinstalling the Cover VT1422A

Line up the 3 Tabs

with the 3 Slots;

then lower cover

onto the Module

Tighten

2Screws

Getting Started 27Chapter 1

Installing SCPs: Step 4, Labeling

Peel off correct

Label from Card and

Stick on the

appropriate place on

the Cover

Terminal Module

(Connect t o A/D

Module Later)

Stick-on Label furnished with the SCP

(Part Number: 43-0133-xxx)

Peel off Label from

Card and Stick on

the Terminal

Moduletobe

Connected to the

A/D Mo dule

28 Getting Started Chapter 1

Disabling the

Input Protect

Feature

(Optional)

Voids Warranty! Disabling the Input Protection Feature voids the VT1422A's warranty.

Disabling the Input Protect feature voids the VT1422A's warranty. The Input Protect feature allows the VT1422A to open all channel input relays if any input's voltage exceeds ±19 volts (±6 volts for digital I/O SCPs). This feature will help to protect the card's Signal Conditioning Plug-ons, input multiplexer, ranging amplifier and A/D from destructive voltage levels. The level that trips the protection function has been set to provide a high probability of protection. The voltage level that is certain to cause damage is somewhat higher. If, in an application, the

importance of completing a measurement run outweighs the added risk of damage to the VT1422A, the input protect feature may be disabled.

To disable the Input Protection feature, locate and cut JM2202. Make a single cut in the jumper and bend the adjacent ends apart. See following illustration for location of JM2202.

Disabling

Flash Memory

Access

(Optional)

The Flash Memory Protect Jumper (JM2201) is shipped in the “PROG” position. It is recommended that the jumper be left in this position so that all of the calibration commands can function. Changing the jumper to the protect position prevents the following from being executed:

•The SCPI calibration command CAL:STORE ADC | TARE

•The register-based calibration commands STORECAL and STORETAR

•Any application that installs firmware-updates or makes any other

modification to Flash Memory through the A24 window.

With the jumper in the “PROG” position, one or more VT1422As can be completely calibrated without removing them from the application system. A VT1422A calibrated in its working environment will, in general, be better calibrated than if it were calibrated separate from its application system.

The multimeter used during the periodic calibration cycle should be considered the calibration transfer standard. Allow Calibration Organization control unauthorized access to the calibration constants.

If access must be limited to the VT1422A's calibration constants, place JM2201 in the protected position and cover the shield retaining screws with calibration stickers. See the following illustration for location of JM2201.

Getting Started 29Chapter 1

Accessing and Locating JM2201 and JM2202 VT1422A

Flash Memory Protect Jumper

Default = PROG (recommended)

JM2201

JM2202

1 Locate

2Cut

3 Bend

Input Protect Jumper

Warning: Cutting this Jumper

VoidsYour Warranty!

30 Getting Started Chapter 1

Installing the Module

Installation of the VT1422A VXI module is covered in the mainframe manual.

WARNING All instruments within the VXI mainframe are grounded through

the mainframe chassis. During installation, tighten the instrument's retaining screws to secure the instrument to the mainframe and to make the ground connection.

WARNING SHOCK HAZARD. Only qualified, service-trained personnel who

are aware of the hazards involved should install, configure, or remove the VXI Module. Disconnect all power sources from the mainframe, the Terminal Modules and installed modules before installing or removing a module.

Instrument Drivers

Two driver types are supplied on the VXIplug&play Drivers & Product Manuals CD that comes with the VT1422A. There is a VXIplug&play driver which includes a front panel program and help file. In addition, there is also a downloadable driver for the Agilent/HP E1406A Command Module. View the readme.txt file provided with the VXIplug&play driver for possible update information.

About Example Programs

Examples on CD All example programs mentioned by file name in this manual are available on the

VXIplug&play Drivers & Product Manuals CD supplied with the VT1422A. Again, see the readme.txt file for the specific file locations of these examples.

Example

Command

Sequences

Typical Example

program

Where programming concepts are discussed in this manual, the commands to send to the VT1422A are shown in the form of command sequences. These are not example programs because they are not written in any computer language. They are meant to show the VT1422A SCPI commands in the sequence they should be sent. Where necessary these sequences include comments to describe program flow and control such as loop - end loop and if - end if. See “Example SCPI Command Sequence” on page 139. for an example. For VXIplug&play users, there is an “Example VXIplug&play Driver Function Sequence” on page 140.

The Verify program (file name verif.cpp) is printed below to show a typical VXIplug&play program for the VT1422A.

Getting Started 31Chapter 1

Verifying a Successful Configuration

An example C program source is shown on the following pages. This program is included on the VXI Technology VXIplug&play Drivers & Product Manuals CD that comes with the VT1422A (file name verif.cpp). The program uses the *IDN? query command to verify the VT1422A is operational and responding to commands. The program also has an error checking function (check()). It is important to include an instrument error checking routine in the programs created, particularly the initial trial programs, so that instant feedback can be attained while learning about the VT1422A. Compile this program acc ording to the plug&play help file (hpe1422.hlp) topics "Introduction to Programming" Programs Using Integrated Environments."

/******************************************************************************* verif.cpp

This example program verifies your instrument installation by reading the instrument IDs and then querying for and printing the SCP types found.

Use the "Copy Button" in the Help File's "Example" window to place this code into the clipboard, then paste this code text into your development tool's editor window. Similarly, "Copy" the actual example code from the help file's "Example" window and paste it into the location provided below.

link with the hpe1422_32.lib - library file

→ "Compiling and Linking

******************************************************************************* */

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <hpe1422.h> /* include the driver header file */

/* GPIB-VXI addressing (0 is the interface number, 208 is the */ /* instrument logical address, INSTR is a VISA resource type) */ #define INSTR_ADDRESS "GPIB-VXI0::208::INSTR"

ViSession addr; ViStatus errStatus;

/* Function Prototypes */ void main (void); /* Main function */ void rst_inst(void); /* Resets the instrument and sends a device clear */ void reads_instrument_id(void); /* reads instrument software revision */ void check (ViSession addr, ViStatus errStatus); /* checks module errors */

/*******************************************************************************/ void main (void) /* Main function */ { ViChar err_message[256];

/* open device session and reset the instrument; check if successful */ errStatus = hpe1422_init(INSTR_ADDRESS,0,0,&addr); if( VI_SUCCESS > errStatus) { hpe1422_error_message( addr, errStatus, err_message); printf("Unable to open %s\n", INSTR_ADDRESS); printf("hpe1422_init() returned error message %s\n", err_message);

32 Getting Started Chapter 1

return; }

rst_inst(); /* Resets the instrument and sends a device clear */ reads_instrument_id(); /* Reads instrument software revision */ /* close the device session */

hpe1422_close(addr); }

/****************************************************************************/ void rst_inst(void) /* Function to set the interface timeout period, resets the instrument, */ /* waits for completion of reset and sends a device clear to enable */ /* the instrument to receive a new command */ { ViInt32 result;

/* set timeout to allow completion of reset */ errStatus = hpe1422_timeOut(addr, 5000); check(addr, errStatus);

/* reset the instrument */ errStatus = hpe1422_reset(addr); check(addr, errStatus);

/* wait for completion of *RST */ errStatus = hpe1422_cmdInt32_Q(addr,"*OPC?",&result); check(addr, errStatus);

/* send a device clear to enable new commands to be sent to the instrument */ errStatus = hpe1422_dcl(addr); check(addr, errStatus);

/* enables automatic error checking after each driver call */ errStatus = hpe1422_errorQueryDetect( addr, VI_TRUE);

} /****************************************************************************/

void reads_instrument_id(void) /* Function uses a hpe1422__revision_query to read the software revision */ /* string. */ { ViChar driver_rev[256]; ViChar instr_rev[256];

/* Query the instrument for its firmware revision */ errStatus = hpe1422_revision_query(addr, driver_rev, instr_rev);

/* Print the results */ printf("The instrument driver's revision is %s\n", driver_rev); printf("The instrument's firmware revision is %s\n", instr_rev); }

/****************************************************************************/ /****************************************************************************/ /* error checking routine */ void check (ViSession addr, ViStatus errStatus) { ViInt32 err_code; ViChar err_message[256];

Getting Started 33Chapter 1

if(VI_SUCCESS > errStatus) { hpe1422_dcl(addr); /* send a device clear */ if(hpe1422_INSTR_ERROR_DETECTED == errStatus) { /* read instrument error until error queue is empty*/

{ hpe1422_error_query( addr, &err_code, err_message); if(err_code != 0) printf("Instrument Error : %ld, %s\n", err_code, err_message);

}

while(err_code != 0); } else { /* query the instrument */ hpe1422_error_message( addr, errStatus, err_message); /* display the error */ printf("Driver Error : %ld, %s\n", errStatus, err_message); } }

return; }

34 Getting Started Chapter 1

About This Chapter

This chapter shows how to plan and connect field wiring to the VT1422A's Terminal Module. The chapter explains proper connection of analog signals to the VT1422A, both two-wire voltage type and four-wire resistance type measurements. Connections for other measurement types (e.g. strain using the Bridge Completion SCPs) refer to the specific SCP manual. Chapter contents include:

Chapter 2

Field Wiring

• Planning the Wiring Layout . . . . . . . . . . . . . . . . . . . . . . . . . . page 35

• Faceplate Connector Pin-Signal Lists. . . . . . . . . . . . . . . . . . . page 39

• Optional Terminal and Connector Modules . . . . . . . . . . . . . . page 40

• Reference Temperature Sensing with the VT1422A . . . . . . . page 44

• Preferred Measurement Connections . . . . . . . . . . . . . . . . . . . page 46

• Connecting the On-Board Thermistor. . . . . . . . . . . . . . . . . . . page 49

• Wiring and Attaching the Terminal Module. . . . . . . . . . . . . . page 50

• Removing the VT1422A Terminal Modules. . . . . . . . . . . . . . page 52

• Attaching and Removing the VT1422A RJ-45 Module . . . . . page 53

• Adding Components to the Terminal Module. . . . . . . . . . . . . page 54

• Spring and Screw Terminal Module Wiring Maps. . . . . . . . . page 55

Planning the Wiring Layout

The first point to understand is that the VT1422A makes no assumptions about the relationship between Signal Conditioning Plug-on (SCP) function and the position in the VT1422A that it can occupy. Any type of SCP can be placed into any SCP position. There are, however, some factors which should be considered when planning what mix of SCPs should be installed in each of the VT1422As. The following discussions will help explain and clarify these factors.

SCP Positions and

Channel Numbers

The VT1422A has a fixed relationship between Signal Conditioning Plug-on positions and the channels they connect to. Each of the eight SCP positions can connect to eight channels. Figure 2-1 shows the channel number to SCP relationship.

Field Wiring 35Chapter 2

SCP

Position 0

(on-board addresses 00-07)

SCP

Position 1

(on-board addresses 08-15)

Terminal

Module

Note: Each channel line represents

Both a Hi and Lo signal line.

Range Amp

16-Bits

A/D

Converter

SCP

Position 2

(on-board addresses 16-23)

SCP

Position 3

(on-board addresses 24-31)

SCP

Position 4

(on-board addresses 32-39)

SCP

Position 5

(on-board addresses 40-47)

Terminal Module

SCP

(on-board addresses 48-55)

(on-board addresses 56-63)

Position 6

SCP

Position 7

Figure 2-1. Channel Numbers at SCP Positions

36 Field Wiring Chapter 2

Sense SCPs and

Output SCPs

Some SCPs provide input signal conditioning (sense SCPs such as filters and amplifiers) while others provide stimulus to the measurement circuit (output SCPs such as current sources and strain bridge completion). In general, channels at output SCP positions are not used for external signal sensing but are paired with channels of a sense SCP. Two points to remember about mixing output and sense SCPs:

1. Paired SCPs (an output and a sense SCP) may reside in separate VT1422As. SCP outputs are adjusted by *CAL? to be within a specific limit. The Engineering Unit (EU) conversion used for a sense channel will assume the calibrated value for the output channel.

2. Output SCPs, while providing stimulus to the measurement circuit, reduce the number of external sense channels available to the VT1422A.

Figure 2-2 illustrates an example of "pairing" output SCP channels with sense SCP channels (in this example, four-wire resistance measurements).

sense Hi

Note

Each channel line represents both a

Hi and Lo input

Input Multiplexer

SCP

(sense)

SCP

(output)

Terminal Module

sense Lo

Ch 24

Ch 31 Ch 32

Ch 39

Figure 2-2. Pairing Output and Sense SCP Channels

output Lo

output Hi

Field Wiring 37Chapter 2

Planning for

Thermocouple

Measurements

Note The isothermal reference temperature measurement made by a VT1422A

Note T o make good low-noise measurements, shielded wiring must be used from

Using either the Screw Terminal or Spring Terminal Modules, thermocouples and the thermocouple reference temperature sensor can be wired to any of the VT1422A's channels. When the scan list is executed, one must ensure that the reference temperature sensor is specified in the channel sequence before any of the associated thermocouple channels.

External wiring and connections to the VT1422A are made using Terminal Modules (see Figures 2-4 through 2-6).

applies only to thermocouple measurements made by that instrument. In systems with multiple VT1422As, each instrument must make its own reference measurements. The reference measurement made by one VT1422A cannot be used to compensate thermocouple measurements made by another VT1422A.

the device under test to the Terminal Module at the VT1422A. The shield must be continuous through any wiring panels or isothermal reference connector blocks and must be grounded at a single point to prevent ground loops. See "Preferred Measurement Connections" later in this section and “Wiring and Noise Reduction Methods” on page 483.

38 Field Wiring Chapter 2

Faceplate Connector Pin-Signal Lists

Figure 2-3 shows the Faceplate Connector Pin Signal List for the VT1422A.

Count

From

Top

GND

REMOTE CHANNEL MULTI-FUNCTION DAC MODULE

H L

CAL

BUS

H L G

GND

H08

L08

H11

L11

H14

L14

H17

L17

H20

L20

H23

L23

H27

L27

H30

L30

GND

HCAL

LCAL

GND

HOHM

LOHM

GND

H00 H01 H02 H03 H04 H05 H06 H07 H09 H10 H12 H13 H15 H16 H18 H19 H21 H22 H24 H25 H26 H28 H29 H31 G3 G3 GND HOHM HCAL GND H_I GND

HCAL LCAL GND HOHM LOHM GND

L00 L01 L02 L03 L04 L05 L06 L07 L09 L10 L12 L13 L15 L16 L18 L19 L21 L22 L24 L25 L26 L28 L29 L31 G3 G3 GND LOHM LCAL GND L_I GND

Count

From

Bottom

6 5 4 3 2 1

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

GND

VT1422A

GND

TST-A

GND

L33

H33

L36

H36

L40

H40

L43

H43

L46

H46

L49

H49

L52

H52

L55

H55

GND

TRG GND SYSF GND G4 G4 G4 H32 H34 H35 H37 H38 H39 H41 H42 H44 H45 H47 H48 H50 H51 H53 H54 H56 H57 H58 H59 H60 H61 H62 H63

GND GND GND GND GND G4 G4 G4 L32 L34 L35 L37 L38 L39 L41 L42 L44 L45 L47 L48 L50 L51 L53 L54 L56 L57 L58 L59 L60 L61 L62 L63

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Figure 2-3. VT1422A Faceplate Connector Pin Signals

Field Wiring 39Chapter 2

Optional Terminal and Connector Modules

The VT1422A is comprised of the main A/D module and optionally, a Connector or Terminal Module. The Option 001 Connector Module provides sixteen RJ-45 jacks to allow easy connection of the VT1422A to Remote Signal Conditioning Units (RSCUs) like the VT1529A/B Remote Strain Conditioning Unit. Optional conventional terminal modules include a Terminal Module with screw-clamped terminal blocks (Option 011) and another with spring-clamped terminal blocks (Option 013).

The Spring Terminal Module and Screw Terminal Module provide:

•Terminal connections to field wiring.

-- Allows a mix of direct field wiring with some connections to Remote Signal Conditioning Units

•Strain relief for the wiring bundle.

•Reference junction temperature sensing for thermocouple

measurements.

•Ground-to-Guard connections for each channel.

The RJ-45 Connector Module provides:

•Easy mass terminated plug-in connection to Remote Signal

Conditioning Units.

The SCPs and

Terminal Module

Layout

WARNING When handling user wiring connected to the Terminal Module,

•Allows some direct analog or digital field wiring to be connected to

RJ-45 modular plugs that are then plugged into the Connector Module.

•Note: Since the RJ-45 Connector Module was designed for connection

to RSCUs, it doesn’t provide an on-board isothermal reference thermistor or connection to the VT1422A’s on-board current source. This means that the RJ-45 Terminal Module is not suitable for direct connection to thermocouples.

Each SCP includes a set of labels to map that SCP's channels to the Terminal Module's terminal blocks. See “Installing SCPs: Step 4, Labeling” on page 28

Figures 2-4 through 2-6 show the layout and feature location of the Terminal Modules available for the VT1422A.

consider the highest voltage present accessible on any terminal. Use only wire with an insulation rating greater than the highest voltage which will be present on the Terminal Module. Do not touch any circuit element connected to the Terminal Module if any other connector to the Terminal Module is energized to more than 30 V ac rms or 60 V dc.

40 Field Wiring Chapter 2

The RJ-45

Connector Module

RJ-45 Connector Module Pinout

for Std SCP I/O

Ch2

Ch0

Shield G nd

RJ-45 Connector Module Pinout

for Std SCP I/O

Ch3

Ch1

Shield G nd

(even chs 0,2,4,6)

Ch4

12345678

(odd chs 1,3,5,7)

Ch5

12345678

Ch2

Ch6

Shield Gnd

Ch3

Ch7

Shield Gnd

Figure 2-4 shows the VT1422A Option 001 RJ-45 Connector Module with connector pin numbering.

+=Hi

-=Lo

+=Hi

-=Lo

R e

d M a

r R e

e I

SCP position 0, chs 0-6 and 1-7

SCP position 1, chs 8-14 and 9-15

SCP position 2, chs 16-22 and 17-23

SCP position 3, chs 24-30 and 25-31

SCP position 4, chs 32-38 and 33-39

SCP position 5, chs 40-46 and 41-47

SCP position 6, chs 48-54 and 49-55

SCP position 7, chs 56-62 and 67-63

Figure 2-4. RJ-45 Connector Module and Pin-out

Spring Terminal

Module Layout

Caution WIRING THE TERMINAL MODULES. When wiring to the

Figure 2-5 shows the VT1422A Option 013 Spring Terminal Module features and jumper locations.

terminal connectors on the screw clamp and spring clamp Terminal Module, be sure not to exceed a 5 mm strip back of insulation to prevent the possibility of shorting to other wiring on adjacent terminals.

Field Wiring 41Chapter 2

Sockets for Guard to Ground Connections

00 01

02 03

BOARD

Terminal B loc k for

Input Connections

Jumper to select for

On-board or Remote

Temperature Sensing

HCAL LOHM HDHM

On-board Thermistor

for Temperature Se nsi ng

REM

GND GND

LTS HTS

LTI

HTI

GND

TRIG

GND

LCAL

TerminalBlock with Remote Temperature Se nsing, Trigger, and ot her Connecti ons

Figure 2-5. VT1422A Spring Terminal Module

42 Field Wiring Chapter 2

Screw Terminal

Module Layout

On-Board Reference

Temperature Sensing

RT1

Figure 2-6 shows the VT1422A Option 011 Screw Terminal Module features and jumper locations.

JM1

ON BOARD

REM

RT1

Jumper Detail

JM1

ON BOARD

REM

Remote Reference

Temperature Sensing

Figure 2-6. VT1422A Screw Terminal Module

Field Wiring 43Chapter 2

Reference Temperature Sensing with the VT1422A

The Screw Terminal and Spring Terminal Modules provide an on-board thermistor for sensing isothermal reference temperature of the terminal blocks. Also provided is a jumper set (J1 in Figures 2-7 and 2-8) to route the VT1422A's on-board current source to a thermistor or RTD on a remote isothermal reference block. Figure 2-7 and Figure 2-8 show connections for both local and remote sensing. See “Connecting the On-Board Thermistor” on page 49 for location of J1.

VT1422A

On-Board Current Source

VT1422A

Terminal Module

REM

BOARD

Any Sense

Channel

Figure 2-7. On-Board Thermistor Connection

Terminal Module

Field Wiring

HTI

LTI

HTS

LTS

Hnn

Lnn

Field Wiring

HTI

On-Board Current Source

REM

Any Sense

Channel

BOARD

LTI

HTS

LTS

Hnn

Lnn

Figure 2-8. Remote Thermistor or RTD Connections

44 Field Wiring Chapter 2

Terminal Module

Considerations for

TC Measurements

The isothermal characteristics of the VT1422A Terminal Module are crucial for good TC readings and can be affected by any of the following factors:

1. The clear plastic cover must be on the Terminal Module.

2. The thin white mylar thermal barrier must be inserted over the Terminal Module connector. This prevents airflow from the VT1422A A/D Module into the Terminal Module.

3. The Terminal Module must also be in a fairly stable temperature environment and it is best to minimize the temperature gradient between the VT1422A module and the Terminal Module.

4. The VXI mainframe cooling fan filters must be clean and there should be as much clear space in front of the fan intakes as possible.

5. Recirculating warm air inside a closed rack cabinet can cause a problem if the Terminal Module is suspended into ambient air that is significantly warmer or cooler. If the mainframe recess is mounted in a rack with both front and rear doors, closing both doors helps keep the entire VT1422A at a uniform temperature. If there is no front door, try opening the back door.

6. VXI Technology recommends that the cooling fan switch on the back of the of the CT-400 Mainframe be in the "High" position. The normal variable speed cooling fan control can make the internal VT1422A module temperature cycle up and down, which affects the amplifiers with these microvolt-level signals.

Field Wiring 45Chapter 2

Preferred Measurement Connections

For any A/D Module to scan channels at high speeds, it must use a very short sample

IMPORTANT!

Notes 1. Try to install Analog SCPs relative to Digital I/O as shown in "Separating

period (< 10 its inputs, that noise will be part of the measurement. To make quiet, accurate measurements in electrically noisy environments, use properly connected shielded wiring between the A/D and the device under test. Figure 2-9 shows recommended connections for powered transducers, thermocouples, and resistance transducers. (See Appendix E page 483 for more information on Wiring Techniques.)

Digital and Analog Signals" in Appendix E.

2. Use individually shielded, twisted-pair wiring for each channel.

3. Connect the shield of each wiring pair to the corresponding Guard (G) terminal on the Terminal Module (see Figure 2-10 for schematic of Guard to Ground circuitry on the Terminal Module).

4. The Terminal Module is shipped with the Ground-to-Guard (GND-GRD) shorting jumper installed for each channel. These may be left installed or removed (see Figure 2-11 to remove the jumper), dependent on the following conditions:

a. Grounded Transducer with shield connected to ground at

b. Floating Transducer with shield connected to the transducer at

5. In general, the GND-GRD jumper can be left in place unless it is necessary to remove to break low frequency (below 1 kHz) ground loops.

6. Use good quality foil or braided shield signal cable.

7. Route signal leads as far as possible from the sources of greatest noise.

8. In general, don't connect Hi or Lo to Guard or Ground at the VT1422A.

9. It is best if there is a dc path somewhere in the system from Hi or Lo to Guard/Ground.

10.The impedance from Hi to Guard/Ground should be the same as from Lo to Guard/Ground (balanced).

11. Since each system is different, don't be afraid to experiment using the suggestions presented here until an acceptable noise level is found.

s for the VT1422A). If significant normal mode noise is presented to

the transducer: Low frequency ground loops (dc and/or 50/60 Hz) can result if the shield is also grounded at the Terminal Module end. To prevent this, remove the GND-GRD jumper for that channel (Figure 2-9 A/C).

the source: In this case, the best performance will most likely be achieved by leaving the GND-GRD jumper in place (Figure 2-9 B/D).

46 Field Wiring Chapter 2

Device

Under Test

pressure

P to V

power

Shield

Hi Lo

Device

Under Test

Device

Under Test

Device

Under Test

pressure

- power

+ power

P to V

- power

Shield

Example for

Thermocouples

Shield

Example for

Powered

Transducers

Shield

Example for

Powered

Transducers

Guard

Hi Lo

Guard

Remove Jumper to break Ground Loop (shield connected to ground at transducer)

Leave Jumper in Place (transducer floating)

Shield

Example for

Resistive

Transducers

Guard

Current Hi ( + ) Current Lo ( – )

Figure 2-9. Preferred Signal Connections

Leave Jumper in Place (transducer floating)

Jumper may be left in place as Current Lo (+) is at VT1422A GND Potential

Field Wiring 47Chapter 2

External Connections

For each

SCP Position

Terminal Module

0.1 Fµ

1 k

GND to GRD Jumper (removable)

1 k

10 k

0.1 Fµ

GND to GRD Jumper (removable)

Figure 2-10. GRD/GND Circuitry on Terminal Module

Remov ing G uard to

Ground on Channel 00

10 k

Figure 2-11. Grounding the Guard Terminals

48 Field Wiring Chapter 2

Connecting the On-Board Thermistor

The following figures show how to use the VT1422A to make temperature measurements using the on-board Thermistor or a remote reference sensor. The Thermistor is used for reference junction temperature sensing for thermocouple measurements. Figure 2-12 shows the configuration for the VT1422A’s Spring Terminal Module, Figure 2-6 shows the configuration for the Screw Terminal Module. See “Reference Temperature Sensing with the VT1422A” on page 44 for a schematic diagram of the reference connections.

ON BOARD

UnderCove

ON BOARD

PlacebothJ1jumpershereto connect current so urce to on-board thermistor RT1. Sense RT1 by connecting any sense channels to terminalsHTS and LTS.

REM

ON BOARD

REM

REMote

Place both J1jumpers here to route curre nt source to terminals HTI and LTI. Connect these terminals to remote thermistor o RTD.Sense with any sense channel.

ON BOARD

SCP 0

SCP 1

REM

SCP 7

SCP 2

SCP 3

SCP 5 SCP 6

SCP 4

See Figure 2-13 on page 50 to remove the cover

Figure 2-12. Temperature Sensing for the Terminal Module

Field Wiring 49Chapter 2

Wiring and Attaching the Terminal Module

Figures 2-13 and 2-14 show how to open, wire and attach the terminal module to a VT1422A.

Remove Clear Cover.

A. Release screws. B. Press tab forward

and release.

Tab

Make Connections (Spring Clamp)

Depress terminal lever(s). Insert

wire(s) into terminal(s). Release levers.

Use wire size 20-26 AWG

5 mm

0.2"

Special tool P/N 8710-2127

(Shipped with Terminal Module)

Remove and Retain Wiring Exit Panel

(Screw Ty pe)

Remove 1 of the 3

wire exit panels.

Use wire

size 16-26

AWG

5 mm

0.2"

VW1 Flammability

Rating

Insert wire into terminal. Tighten screw.

Route Wiring

Tighten wraps to

secure wires.

Figure 2-13. Opening and Wiring the VT1422A’s Terminal Module

50 Field Wiring Chapter 2

Replace Wiring Exit Panel

Replace Clear Co ver

A. Hook in the top cover tabs onto the fixture

B. Press down and tighten screws

Cut required

holes in panels

for wire exit

Install the Terminal

Module

Install Mylar Thermal Barrier

on Terminal Module

connectors

Keep wiring exit panel hole as small as possible

Push in the Extraction Levers to Lock the

Terminal Module onto the VT1422A

Extraction

Levers

VT1422A

Module

Figure 2-14. Closing and Attaching the VT1422A Terminal Module

Field Wiring 51Chapter 2

Removing the VT1422A Terminal Modules

Figure 2-15 shows how to remove the Spring Terminal and Screw Terminal Modules from the VT1422A.

Releasethetwoextraction

levers and push both levers out simultaneo usly

Extraction Lever

Use a small screwdriver

to pry and release the

twoextractionlevers

Free and remove the Terminal

Module from the A/D Module

Extraction Lever

VT1422A

Extraction Lever

Figure 2-15. Removing the Screw and Spring Terminal Modules

52 Field Wiring Chapter 2

Attaching and Removing the VT1422A RJ-45 Module

Figure 2-16 shows how to remove the RJ-45 Terminal Module.

Install on VT1422A

Push in the Extraction Levers to Lock the Terminal Module onto the VT1422A

Extraction

Levers

Releasing the Extraction Levers to Remove the Terminal Module

Screwdriver

With 1/8"

Blade

Figure 2-16. Removing the RJ-45 Terminal Module

Field Wiring 53Chapter 2

Adding Components to the Terminal Module

The back of the terminal module PCB (printed circuit board) provides surface mount pads which can be used to add serial and parallel components to any channel's signal path. Figure 2-17 shows additional component locator information (see the schematic and pad layout information on the back of the terminal module PCB). Figure 2-18 shows some usage example schematics.

TO USER WIRING

Upper layout also applies here

Lower layout also applies here Lower layout also applies here

SCHEMATIC OF MODIFIABLE PARTS

HI HI

COMP

LOCATOR

TO VT1413C/VT1415A

LOCATOR

COMP

Figure 2-17. Additional Component Location

0 ohms

PHL

TO VT1422A

10 kohms

0.1 Fµ

PHL

TO VT1422A

Normal Mode Low-Pass Filter Circuit

±16 volts unless attenuated with a VT1513A SCP)

TO USER WIRING

Default Circuit

PHL

0 ohms

250 ohmsor200 ohms

TO VT1422A

4-20 mA NOTE: input must not exceed common mode limits (usually

4 to 20 mA Sense 5 V full scale with 250 ohm (must use 16 volt range) 4 V full scale with 200 ohm (can use 4 volt range for better resolution)

Figure 2-18. Series & Parallel Component Examples

54 Field Wiring Chapter 2

Spring and Screw Terminal Module Wiring Maps

Figure 2-19 shows the Spring Terminal Module wiring map.

Top

All wiring entering Terminal

Module passes under this

strain relief bar

H24

L24 G24 H25

L25 G25 H26

L26 G26 H27

L27 G27 H28

L28 G28 H29

L29 G29

H30

L30 G30 H31

L31 G31

H16

L16 G16 H17

L17 G17 H18

L18 G18 H19

L19 G19 H20

L20 G20 H21

L21 G21

H22

L22 G22 H23

L23 G23

H08

L08 G08 H09

L09 G09 H10

L10 G10

H11

L11 G11 H12 L12 G12 H13 L13 G13 H14

L14 G14 H15

L15 G15

GND GND GND GND

LTS

HTS

LTI

HTI

GND

TRIG

GND LCAL HCAL

LOHM HOHM

GND

H00

L00 G00 H01

L01 G01 H02

L02 G02

H03

L03

G03

H04

L04

G04

H05

L05

G05

H06

L06 G06 H07

L07 G07

Heavy line indicates the

side of the terminal block

that the wire enters

Figure 2-19. Spring Terminal Module Full-Size Wring Map

G32

L32 H32 G33

L33 H33 G34

L34 H34 G35

L35 H35 G36

L36 H36 G37

L37 H37

G38

L38 H38 G39

L39 H39

G40

L40 H40 G41

L41 H41 G42

L42 H42 G43

L43 H43 G44

L44 H44 G45

L45 H45

G46

L46 H46 G47

L47 H47

G48

L48 H48 G49

L49 H49 G50

L50 H50

G51

L51

H51

G52

L52

H52

G53

L53

H53

G54

L54 H54 G55

L55 H55

G56

L56 H56 G57

L57 H57 G58

L58 H58

G59

L59

H59

G60

L60

H60

G61

L61

H61

G62

L62 H62 G63

L63 H63

Field Wiring 55Chapter 2

Figure 2-20 shows the Screw Terminal Module wiring map.

heavy line indicates side of

terminal block wire enters

H08

L08

H09

L09

H10

L10

H24

L24

H25

L25

H26

L26

L37 H37

L38

H38

L39

H39

L53

H53

L54

H54

L55

H55

H11

L11

H12

L12 H13 L13 H27 L27

H28

L28 H29 L29

L34 H34

L35 H35 L36 H36

L50 H50 L51 H51 L52 H52

H14 H15

SCP 1

SCP 3

HOHM

LOHM

HCAL

LCAL

GND TRG

HT1

HTS

SCP 4 SCP 6

H32 H33

H48 H49

L14 L15

G1 G1

H30

L30

H31

L31

G3 G3

LT1

LTS

G4 G4

L32 L33

G6 G6

L48 L49

H00

L00

H01

L01

H02

L02

H03

L03

H04

L04

H16

L16

H17

L17

H18

L18

H19

L19

L44

H44

L45

H45

L46

H46

L47

H47

L59

H59

L60

H60

L61

H61

L62 H62 L63 H63

H05 H06

SCP 0

L06 H07

H20

L20 H21

L21 H22

SCP 2

L22 H23 L23

SCP 5

H40 H41 H42 H43

SCP 7

H56 H57 H58

L05

L07

G0 G0

G2 G2

G5 G5

L40 L41

L42 L43 G7

L56 L57 L58

Figure 2-20. Screw Terminal Module Full-Size Wiring Map

56 Field Wiring Chapter 2

Field Wiring 57Chapter 2

58 Field Wiring Chapter 2

Chapter 3

Programming the VT1422A & VT1529A/B

for Remote Strain Measurement

About This Chapter

This chapter describes using the VT1422A in combination with the VT1539A Remote Channel SCP and VT1529A/B Remote Strain Conditioning Units to make large channel count strain measurements. The system is shown being used strictly in a data acquisition mode where, after configuration, it is driven by a user-defined channel list (the Scan List) and sends the measurements to the unit’s FIFO buffer and Current Value Table (CVT) for transfer to the computer. Of course, control algorithms can also be created that execute concurrently with the Scan List driven data acquisition operation. Chapter 4 and Chapter 6 cover general data acquisition and control programming with algorithms. This chapter assumes that the user is an expert when it comes to making strain measurements, so this chapter simply illustrates how to make strain measurements with the VXI Technology Remote Strain Measuring System (VT1422A, VT1539A, and VT1529A/B). The chapter will cover:

• Instrument Setup for Remote Strain Measurements. . . . . . . . page 58

-- Preparing the VT1422A for Installation . . . . . . . . . . . . . . . page 58

-- Preparing the VT1529A/B for Use . . . . . . . . . . . . . . . . . . . page 59

-- Installing User Selected 1/4 Bridge Resistors (Optional). . page 59

-- Connecting VT1529A/Bs to the VT1422A. . . . . . . . . . . . . page 62

-- Connecting Excitation Supplies . . . . . . . . . . . . . . . . . . . . . page 67

• Connecting the VT1529A/B to Strain Gages . . . . . . . . . . . . . page 69

-- Channel Connector Pin-to-Signal Relationship . . . . . . . . . page 69

• VT1529A/B Bridge Configurations . . . . . . . . . . . . . . . . . . . . page 70

• Connecting to the VT1529A/Bs Dynamic Strain Ports . . . . . page 73

-- Dynamic Strain Port Offset Control . . . . . . . . . . . . . . . . . . page 75

• Remote Strain Channel Addressing . . . . . . . . . . . . . . . . . . . . page 76

-- Runtime Remote Scan Verification. . . . . . . . . . . . . . . . . . . page 76

• Programming for Remote Strain Measurement . . . . . . . . . . . page 78

-- Description of Strain Measurement . . . . . . . . . . . . . . . . . . page 78

Measure Strain Using Built-in Strain EU Conversion . . page 79 Measure Strain Using User Specified EU Conversion . . page 83

Measure Bridge Voltages and Convert to Strain. . . . . . . page 86

• Verifying Correct Bridge Completion (Shunt Cal) . . . . . . . . . page 90

• Built-in Strain Conversion Equations . . . . . . . . . . . . . . . . . . . page 92

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 57Chapter 3

Instrument Setup for Remote Strain Measurements

This section involves:

•Preparing the VT1422A for installation into a VXIbus Mainframe

•Preparing the VT1529A/B for use

•Connecting the VT1422A to VT1529A/B Remote Strain Completion

units.

•Connecting Excitation power supplies to the VT1529A/B

•Connecting strain bridges to the VT1529A/B

Preparing the

VT1422A for

Installation

The VT1422A requires VT1539A SCPs to control Remote Signal Conditioning Units like the VT1529A/B Remote Strain Conditioning Unit. Chapter 1 “Getting Started” covers everything which is needs to be done before installing the VT1422A in its mainframe. This includes switch settings and SCP installation. After performing the operations in Chapter 1, return here for Remote Strain specific operations.

Overview Before getting into the specifics of configuring a Remote Strain Measuring

System, it might be helpful to see the overall set up. Figure 3-1 shows the components and connections of a remote strain measuring system. The circled letters identify connections that will be referenced in later sections.

Up to 4 excitation supplies

Each VT1422A with VT1539A SCPs

and VT1529A/B Remote Strain Units

can support up to 512 strain gages

VT1539A

SCP (Up to 8)

VT1529A/B

Up to 32 strain

gages

Up to 16 VT1529A/Bs

VT1529A/B

VT1422A Multifunction

DAC Module shown with

an Option 001 RJ-45

Connector Module

Up to four excitation supplies

Up to 32 strain

gages

Figure 3-1. Components of the Remote Strain Measuring System

58 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Preparing the

VT1529A/B for Use

WARNING Ground the equipment: The safety Earth ground for the

WARNING The power cord is the only way to disconnect the VT1529A/B

For most applications, the VT1529A/B is ready for installation as delivered. It is designed to be easily rack mounted in a system cabinet by its built-in front panel extensions. All user connection are accessible on the front panel with the exception of the line-cord jack which is on the rear of the unit. The only pre-installation operation which may need to be considered is installation of the user supplied quarter-bridge completion resistors. If these are required by the application, see “Installing User Selected 1/4 Bridge Resistors (Optional)” in the following section.

VT1529A/B is supplied through the ground conductor of the power cable. Make sure that the installation’s ac line supply connectors provide a suitable Earth ground.

from ac power. Therefore, the power cord must be accessible to the operator at all times. When the VT1529A/B is mounted in a system cabinet, the power cord need not be accessible since the cabinet must have its own disconnect device.

Installing User

Selected 1/4 Bridge

Resistors (Optional)

Perform this operation only if one or more VT1529A/B channels are required to provide 1/4 Bridge completion of other than 120 Only those with experience in soldering components on printed circuit boards should attempt this installation. The VT1529A/B provides locations on its printed circuit board for the user’s own 1/4 bridge completion resistors. Bridge configuration commands then can switch these resistors into the bridge completion circuits where the custom value resistors are installed.

Ω or 350 Ω.

WARNING Keep away from live circuits: Operating personnel must not

remove equipment covers or shields. Procedures involving the removal of covers or shields are for use by service-trained personnel only. Under certain conditions, dangerous voltages may exist even with the equipment switched off. To avoid dangerous electrical shock, DO NOT perform procedures involving cover or shield removal unless qualified to do so.

Removing the Top Cover Figure 3-2 shows how to access the printed circuit board where the user

specified resistors will be installed. Notice that both a surface-mount as well as a through-hole position is provided for each channel.

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 59Chapter 3

Tab

Unlatch Cover from Bottom Cover Tab on Each Side

Detail "A"

Figure 3-2. Removing the VT1529A/B Top Cover

Loosen

Top Cover

Screw

Remove Top Cover

PC Board

See Detail "A"

60 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Locating Resistors Figure 3-3 provides the relationship between P.C. board location and bridge

”

resistor channel number. The surface mount pads nearest the through-hole locations are in parallel with them.

"Rxx" Indicates the

Channel Number

Through-Hole

OROR

Resistor Positions

R E S U

4 2 R

R E S U

5 2 R

Surface-Mount

Resistor Positions

P401

P402

4 P

Figure 3-3. Locating User 1/4 Bridge Resistor Positions

Installing Resistors Figure 3-4 shows a typical user selected 1/4 bridge resistor installation. Note

that resistor installations can be accomplished from the top of the board without further disassembly. If installing through-hole resistors, be very careful to observe the specified maximum safe resistor lead length to avoid shorting the resistor to the chassis.

PC Board

Chassis

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 61Chapter 3

0.1

2.54 m

Figure 3-4. Installing User 1/4 Bridge Resistors

Connecting

VT1529A/Bs to the

VT1422A

The cable between a VT1422A and each VT1529A/B (connection "A" in Figure 3-1) is a standard type of cable used in computer Local Area Networks (LANs). The VT1529A/B can be any distance up to 1000 feet (304.8 m) from the VT1422A and the interconnect cable can be easily custom made to fit the installation. This type of cable assembly can typically be found in the IT (Information Technology) department of most companies.

The cable assembly as a whole must comply with the TIA/EIA-568 Category 5 standard for LAN interconnecting cable. This is a performance based standard and will insure that the VT1422A will be able to make accurate measurements from a VT1529A/B over the maximum cable length of 1000 feet (304.8 meters). Additionally, the cable and connectors must be shielded.

Cabling Supplies

and Tools

Overall-Shielded Twisted Pair (STP) TIE/EIA-568 Category 5 (4 twisted pairs) Plenum Type: (Flame Retardant Jacket and FEP ‡Teflon insulation) 1624P Non-Plenum Type: (PVC Jacket and polyolefin insulation) 1624R

Tables 3-1 and 3-2 show part numbers for supplies which can facilitate the production of custom high quality cables for the installation. If a third party builds the cables, make certain they supply cables that comply with the TIA/EIA-568 Category 5 standard and are they are shielded

. The part numbers shown here are those of major suppliers in the industry. These numbers can be cross-referenced to other supplier’s equivalent products.

Please note that safety standards for wiring (flammability, etc.) may apply to the installation and that one should check applicable local codes and standards and select the proper type of cable accordingly (plenum vs. non-plenum types, etc.).

Table 3-1. Cable Part Numbers

Cable Part Numbers for Belden Wire & Cable Company

‡DuPont trademark

Table 3-2. Connector Part Numbers

Connector Part Numbers for AMP Incorporated

RJ-45 Plug: (for solid conductors and round shielded cable) 5-569530-4 RJ-45 Plug: (for stranded conductors and round shielded cable) 5-56 9550-4 Strain Relief 558527-1 Hooded Boot: (replace X with 0=Gry, 1=Blk, 2=Lt. Almond,

3=Red, 4=Grn, 5=Blu, 6=Yel, 7=Org, 8=Wht, 9=Vio) RJ-45: Plug Installation Tool with 8-position dies 2-231652-1

62 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

569875-X

Two Interconnect

Methods

Depending on the Terminal Module ordered with the VT1422A, there are two methods of interconnecting a VT1529A/B to the VT1422A (connection "A" in Figure 3-1).

The Option 001 RJ-45

Connector Module

VT1422A-001

The RJ-45 Connector Module is used when most or all of VT1422A SCP positions contain a VT1539A Remote Channel SCP. For RSCUs, simply plug one end into the VT1422A and the other into the VT1529A/B’s Data Interface connector. Figure 3-5 shows this connection and includes a schematic diagram of the RJ-45-to-RJ-45 cable. See Figure 2-4 on page 41 for on-board SCP channel connection through the RJ-45 connector module.

VT1529A/B

Length up to 100 feet (304.8 m)

Shield Shield

1 2 3 4 5 6 7 8

Wht/Grn Grn Wht/Org Blu Wht/Blu Org Wht/Brn Brn

Twisted Pair

Twisted Pair Twisted Pair

Twisted Pair

Figure 3-5. Connecting VT1529A/Bs to the RJ-45 Connector Module

1 2 3 4

TIA/EIA 568A Wiring Diagram

5 6 7 8

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 63Chapter 3

Spring and Screw Terminal Modules

SCP Position Plug

Pin#

SCP Position 0 Addresses 10000 to 10131

SCP Position 1 Addresses 10800 to 10931

SCP Position 2 Addresses 11600 to 11731

1 Analog+ (wht-green) HI 00 HI 01 2 Analog- (green) LO 00 LO 0 1 3 Cal+ (wht-orange) HI 02 HI 03 4 RS-485+ (blue) HI 04 HI 05 5 RS-485- (wht-blue) LO 04 LO 05 6 Cal- (orange) LO 02 LO 03 7 Trigger+ (wht-brown) HI 06 HI 07 8 Trigger- (brown) LO 06 LO 0 7 1 Analog+ (wht-green) HI 08 HI 09 2 Analog- (green) LO 08 LO 0 9 3 Cal+ (wht-orange) HI 10 HI 11 4 RS-485+ (blue) HI 12 HI 13 5 RS-485- (wht-blue) LO 12 LO 13 6 Cal- (orange) LO 10 LO 11 7 Trigger+ (wht-brown) HI 14 HI 15 8 Trigger- (brown) LO 14 LO 1 6 1 Analog+ (wht-green) HI 16 HI 17 2 Analog- (green) LO 16 LO 1 7 3 Cal+ (wht-orange) HI 18 HI 19 4 RS-485+ (blue) HI 20 HI 21 5 RS-485- (wht-blue) LO 20 LO 21 6 Cal- (orange) LO 18 LO 19 7 Trigger+ (wht-brown) HI 22 HI 23 8 Trigger- (brown) LO 22 LO 2 3

For mixed on-board SCP channels and RSCU operation, spring or screw type terminal modules can be used. For standard SCP channel connections, see Chapter 2 “Field Wiring” on page 35. For remote channels, connect the individual wires from each VT1529A/B’s data interface cable to the appropriate terminals for remote channel operation. The VT1539A SCP is supplied with signal locator labels for each SCP position on a Spring Terminal Module. No label is provided for the Screw terminal module. Instead, Table 3-3 provides the relationship between each VT1539A signal name and associated terminal name as printed on the Terminal Module.

Note: In the table below, color combinations may vary.

Table 3-3. VT1539A Signal Names

SCP Signal Names - to - Terminal Names

VT1539A Signal Name

(with EIA/TIA-568A

wire color-code)

Terminal Name on

Terminal Module

(SCP’s low channel)

Terminal Name on

Terminal Module

(SCP’s High Channel)

64 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

SCP Position Plug

Pin#

SCP Position 3 Addresses 12400 to 12531

SCP Position 4 Addresses 13200 to 13331

SCP Position 5 Addresses 14000 to 14131

SCP Position 6 Addresses 14800 to 14931

SCP Position 7 Addresses 156000 to 157131

1 Analog+ (wht-green) HI 24 HI 25 2 Analog- (green) LO 24 LO 2 5 3 Cal+ (wht-orange) HI 26 HI 27 4 RS-485+ (blue) HI 28 HI 29 5 RS-485- (wht-blue) LO 28 LO 29 6 Cal- (orange) LO 26 LO 27 7 Trigger+ (wht-brown) HI 30 HI 31 8 Trigger- (brown) LO 30 LO 3 1 1 Analog+ (wht-green) HI 32 HI 33 2 Analog- (green) LO 32 LO 3 3 3 Cal+ (wht-orange) HI 34 HI 35 4 RS-485+ (blue) HI 36 HI 37 5 RS-485- (wht-blue) LO 36 LO 37 6 Cal- (orange) LO 34 LO 35 7 Trigger+ (wht-brown) HI 38 HI 39 8 Trigger- (brown) LO 38 LO 3 9 1 Analog+ (wht-green) HI 40 HI 41 2 Analog- (green) LO 40 LO 4 1 3 Cal+ (wht-orange) HI 42 HI 43 4 RS-485+ (blue) HI 44 HI 45 5 RS-485- (wht-blue) LO 44 LO 45 6 Cal- (orange) LO 42 LO 43 7 Trigger+ (wht-brown) HI 46 HI 47 8 Trigger- (brown) LO 46 LO 4 7 1 Analog+ (wht-green) HI 48 HI 49 2 Analog- (green) LO 48 LO 4 9 3 Cal+ (wht-orange) HI 50 HI 51 4 RS-485+ (blue) HI 52 HI 53 5 RS-485- (wht-blue) LO 52 LO 53 6 Cal- (orange) LO 50 LO 51 7 Trigger+ (wht-brown) HI 54 HI 55 8 Trigger- (brown) LO 54 LO 5 5 1 Analog+ (wht-green) HI 56 HI 57 2 Analog- (green) LO 56 LO 5 7 3 Cal+ (wht-orange) HI 58 HI 59 4 RS-485+ (blue) HI 60 HI 61 5 RS-485- (wht-blue) LO 60 LO 61 6 Cal- (orange) LO 58 LO 59 7 Trigger+ (wht-brown) HI 62 HI 63 8 Trigger- (brown) LO 62 LO 6 3

Table 3-3. VT1539A Signal Names

SCP Signal Names - to - Terminal Names

VT1539A Signal Name

(with EIA/TIA-568A

wire color-code)

Terminal Name on

Terminal Module

(SCP’s low channel)

Terminal Name on

Terminal Module

(SCP’s High Channel)

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 65Chapter 3

Example Terminal

Module to VT1529A/B

Connection

Figure 3-6 shows a typical connection to a VT1529A/B through one of the optional terminal modules. In this case, the connection is to the low channel on the VT1539A in SCP position number 6 (channels 14800 -

14831). For connection to other SCP positions, use the "Terminal Module Connection Formula" from Figure 3-6 or the data from Table 3-3 .

56 59 636261605857

GLHGLHGLHGL HGLHGLHGLHGLH

2 n

51 555453525049

wht-grn

green

wht-org

4 5 6 7 8

blue wht-blu orange wht-brn brown

(Note: color combinations

may vary)

Terminal Module Connection Formula

SCP Low Channel SCP High Channel

SCP Pos. * 8 + wht-grn

green wht-org orange blue wht-blu wht-brn brown

0Hi 0Lo 2Hi 2Lo 4Hi 4Lo 6Hi 6Lo

Figure 3-6. Connecting a VT1529A/B to an Optional Terminal Module

SCP Pos. * 8 + wht-grn

green wht-org orange blue wht-blu wht-brn brown

1Hi

Hi5 Lo

5 7Hi

66 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Connecting

Excitation Supplies

Notes 1. The excitation supply must have a balanced output with respect

This connection is shown as "B" in Figure 3-1. The VT1529A/B uses external excitation supplies. There are four pairs of input pins (and Gnd) at the "Bridge Excitation" connector for up to four individual excitation supplies. Each of these four inputs power eight channels through a programmable switch. Multiple excitation inputs can be parallel-wired to a single power supply.

to ground. That is, the output must be centered about ground. For example, if the supply voltage is 5 V, then the positive lead should be +2.5 V and the negative lead at -2.5 V . Use of an unbalance d excitation supply causes longer than normal settling times in the VT1529A/B, which will cause errors during the measurement of the excitation voltage and the next few channels.

2. The maximum excitation voltage the VT1422A can sense through the VT1529A/B’s excitation sense path is 16 V (±8 V dc centered about the Gnd terminal). If a higher excitation voltage is supplied through the VT1529A/B, do not connect the excitation sense terminals.

3. Make sure that the power supply chosen can supply the current requirement of all of the bridges it can be switched to. It will be connected to all bridges to be measured before a measurement scan is started. The supply switches cannot be programmatically re-configured while a measurement scan is under way. The measurement scan must be halted to programmatically re-configure the excitation supply switches.

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 67Chapter 3

Power Supplies

and Cabling

Inside

VT1529A/B

Power

Supply 1

Power

Supply 4

Ch 0-7

-P

Gnd

-P

Chs 0-7

Chs 24-31

Gnd

Ch 8-15

+ -

+ - + -

Ch 16-23 Ch 24-31

+ -

Figure 3-7. Excitation Supply Connections

68 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Connecting the VT1529A/B to Strain Gages

The following discussion relates to the connection marked "C" in Figure 3-1 on page 58. Connecting the strain gages to the RJ-45 telecom connectors is illustrated below. These connections can be made with the same type of cable and crimp-on connectors used for Data Interface connection (connection "A" in Figure 3-1). See Figure 3-8 for a gage connection example.

RJ-45 Modular Connector (Shielded)

(Example Half-Bridge Connection)

8-Conductor Twisted-Pair, Overall-Shielded

(Probably Stranded for Flexability)

Figure 3-8. VT1422A to Strain Gage Connection

Channel Connector

Pin-to-Signal

Relationship

Figure 3-9 shows the pin-to-signal relationship for each VT1529A/B strain gage connector. The same signal names are found on the following stra in bridge configuration illustrations as well.

Pinout for Upper Connector Row

Shield Gnd

Excitation Sense

Sense

Excitation

Shield Gnd

R Cal

32145678

Shield Gnd

Excitation

Sense

SenseSense

Excitation Sense

Shield Gnd

Pinout for Lower Connector Row

Figure 3-9. Pin-out for Strain Gage Connectors

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 69Chapter 3

VT1529A/B Bridge Configurations

)

om CHs

Strain Bridge

The Quarter Bridge

configuration

8-pin telcom

connector (RJ-45)

Pin 1

+Excitation

Pin 8

+Excitation Sense

Pin 6

+Sense

Pin 3

-Sense Wagner

Voltage enable

off for full bridge

350

120

customer

RJ-45 Pin#

12345678

Pin 7

Pin 2

-Excitation Sense

-Excitation

Figure 3-10 shows the connections to the 8-pin telecom connector for a quarter bridge configuration. It also shows a simplified schematic of the bridge completion settings for a quarter bridge channel.

uarter Bridge

10k

SENS:FUNC:STRAIN:<br_type>

Local Rcal

Enable

CAL:REMote?

SENS:STR:BRIDge:TYPE

(channel 0 shown)

Cal-Cal+

50k

Internal

Rcal

Excitation

to CHs 1-7

Current

Limit

Instrument.

Amplifier

X16

+Excitation Sense

-Excitation Sense

enable excitation

Optional

Filter

2,10,100Hz

CH00 CH01

32:1 Mux

CH31

SENS:STR:EXC:STATE

+ Excitation

Excitation

CHs 0-7

Buffer

INP:FILT:FREQ

CH00

INP:FILT:STATe

CH01

32:1 Mux

CH31

SENS:STR:CONNect BRID | EXC

Buffer

Dynamic Strain

(VT1539A SCP

Output

To VT1422A

RJ-45

2:1

Mux

Cal+ Cal-

Pin 5 Pin 4

-R Cal

+R Cal

Remote Rcal

Enable

Int/Ext Rcal

OUTP:SHUNT:SOUR INT | EXTOUTP:SHUNT ON | OFF

Select

Excitation Sense

1-31

Bridge Sense

1-31

Figure 3-10. Bridge Completion for a Quarter Bridge Channel

Note While the diagram above shows amplifier gain in the measurement path,

the measurement values returned by these channels are corrected by the VT1422A’s DSP (Digital Signal Processor) chip to reflect the actual value at the user input terminal. The only time gain must be considered is when the input voltage times the gain would overload the A/D range chosen with a SENS:FUNC:... <range>,(<ch_list>) command. For example, with a gain of 32, any input voltage greater than 0.5 V would cause an overload reading even on the highest A/D range (16 V).

-R Cal

+R Cal

External customer

shunt cal resistor

terminals

70 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Strain

Half Brid

)

Bridge

The Half Bridge

configuration

8-pin telcom

connector (RJ-45)

Pin 1

+Excitation

Pin 8

+Excitation Sense

Pin 6

+Sense

Pin 3

-Sense

Pin 7

-Excitation Sense

Pin 2

-Excitation

RJ-45 Pin#

12345678

customer

10k

Wagner

Voltage enable

off for full bridge

10k

350

120

Figure 3-11 shows the connections to the 8-pin telecom connector for a half bridge configuration. It also shows a simplified schematic of the bridge completion settings for a half bridge channel.

CAL:REMote?

10k

SENS:FUNC:STRAIN:<br_type>

SENS:STR:BRIDge:TYPE

Local Rcal

Enable

(channel 0 shown)

Cal-Cal+

50k

Internal

Rcal

Excitation

to CHs 1-7

Current

Limit

Instrument.

Amplifier

X16

+Excitation Sense

-Excitation Sense

enable excitation

Optional

Filter

2,10,100Hz

CH00 CH01

32:1 Mux

CH31

SENS:STR:EXC:STATE

+ Excitation

Excitation

CHs 0-7

Buffer

INP:FILT:FREQ

CH00

INP:FILT:STATe

CH01

32:1 Mux

CH31

SENS:STR:CONNect BRID | EXC

Buffer

Dynamic Strain

Output

To VT1422A

(VT1539A SCP

2:1

Mux

Cal+ Cal-

RJ-45

Pin 5 Pin 4

-R Cal +R Cal

Remote Rcal

Enable

OUTP:SHUNT:SOUR INT | EXTOUTP:SHUNT ON | OFF

Int/Ext Rcal

Select

Excitation Sense

from CHs 1-31

Bridge Sense

from CHs 1-31

External customer

shunt cal resistor

Figure 3-11. Bridge Completion for a Half Bridge Channel

Note While the diagram above shows amplifier gain in the measurement path,

-R Cal

+R Cal

terminals

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 71Chapter 3

Strain

Full Brid

Bridge

The Full Bridge

configuration

8-pin telcom

connector (RJ-45)

Pin 1

+Excitation

Pin 8

+Excitation Sense

Pin 6

+Sense

Pin 3

-Sense

Pin 7

-Excitation Sense

Pin 2

-Excitation

RJ-45 Pin#

12345678

customer

10k

Wagner

Voltage enable

off for full bridge

10k

350 120

Figure 3-12 shows the connections to the 8-pin telecom connector for a full bridge configuration. It also shows a simplified schematic of the bridge completion settings for a full bridge channel.

CAL:REMote?

10k

SENS:FUNC:STRAIN:<br_type>

SENS:STR:BRIDge:TYPE

Local Rcal

Enable

(channel 0 shown)

Cal-Cal+

50k

Internal

Rcal

Excitation

to CHs 1-7

Current

Limit

Instrument.

Amplifier

X16

+Excitation Sense

-Excitation Sense

enable excitation

Optional

Filter

2,10,100Hz

CH00 CH01

32:1 Mux

CH31

CHs 0-7

Buffer

SENS:STR:EXC:STATE

+ Excitation

Excitation

Dynamic Strain

Output

INP:FILT:FREQ

CH00

INP:FILT:STATe

CH01

32:1 Mux

CH31

SENS:STR:CONNect BRID | EXC

Buffer

To VT1422A

(VT1539A SCP)

RJ-45

2:1

Mux

Cal+ Cal-

Pin 5 Pin 4

-R Cal

+R Cal

Remote Rcal

Enable

OUTP:SHUNT:SOUR INT | EXTOUTP:SHUNT ON | OFF

Int/Ext Rcal

Select

Excitation Sense

from CHs 1-31

Bridge Sense

from CHs 1-31

External customer

shunt cal resistor

Figure 3-12. Bridge Completion for a Full Bridge Channel

Note While the diagram above shows amplifier gain in the measurement path,

-R Cal

+R Cal

terminals

72 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Connecting to the VT1529A/Bs Dynamic Strain Ports

The VT1529A/B has two, 37-pin connectors that provide wideband amplified outputs from each strain bridge signal. This allows for connection to a high-speed ADC-per-channel instrument like the VT1432A or VT1433B to capture dynamic strain events.

While an instrument like the VT1432A or VT1433B can measure signals from the VT1529A/B, a VT1422A is still required to control the VT1529A/B’s bridge configuration, calibration and self-test functions.

One VT1422A can control up to sixteen VT1529A/Bs. Figure 3-13 shows the general interconnection layout for a VT1432A. The cable shown is the VT1529A/B Option 001. This cable is 10 feet (3.05 meters) long.

Two VT1432As Are

16-Channel VT1432A

Required to Monitor All 32 VT1529A/B Channels

VT1422A Provides Control

32-Channel VT1529A/B

Extending the

Dynamic Strain

Connection

Note The spacing between the two "Buffered Output" connectors is narrow

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 73Chapter 3

Figure 3-13. VT1432A to VT1529A/B Connection

If additional length is required, build or have an extender cable built with a male, 37-pin D-connector on one end and a female, 37-pin D-connector on the other. The extender cable must provide sixteen twisted pair conductors and be overall shielded. See “Dynamic Strain Extender Cable Pin-Out” on page 74.

(0.625 in./15.875 mm) and requires narrow connector shells. The following two manufacturers’ parts work well:

L-COM (distributor catalog Cat# SDRS37HOT) Cinch DC24660 (Newark Cat# - 45F988)

Table 3-4. Dynamic Strain Extender Cable Pin-Out

Female 37-Pin Connector

Pin Number

1 Buffered Output 0+/16+ 1 20 Buffered Output 0-/16- 20 2 Buffered Output 1+/17+ 2 21 Buffered Output 1-/17- 21 3 Buffered Output 2+/18+ 3 22 Buffered Output 2-/18- 22 4 Buffered Output 3+/19+ 4 23 Buffered Output 3-/19- 23 5 Buffered Output 4+/20+ 5 24 Buffered Output 4-/20- 24 6 Buffered Output 5+/21+ 6 25 Buffered Output 5-/21- 25 7 Buffered Output 6+/22+ 7 26 Buffered Output 6-/22- 26 8 Buffered Output 7+/23+ 8 27 Buffered Output 7-/23- 27 9 Buffered Output 8+/24+ 9 28 Buffered Output 8-/24- 28 10 Buffered Output 9+/25+ 10 29 Buffered Output 9-/25- 29 11 Buffered Output 10+/26+ 11 30 Buffered Output 10-/26- 30 12 Buffered Output 11+/27+ 12 31 Buffered Output 11-/27- 31 13 Buffered Output 12+/28+ 13 32 Buffered Output 12-/28- 32 14 Buffered Output 13+/29+ 14 33 Buffered Output 13-/29- 33 15 Buffered Output 14+/30+ 15 34 Buffered Output 14-/30- 34 16 Buffered Output 15+/31+ 16 35 Buffered Output 15-/31- 35 17, 18, 19, 36, 37 Shield (drain wire) 17, 18, 19, 36, 37

Signal Name Male 37-Pin Connector

Pin Number

74 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Dynamic Strain Port

Offset Control

Each buffered dynamic strain channel includes an offset adjusting DAC controlled by the command

SOURce:VOLTage[:AMPLitude] <-offset_v>,(@<ch_list>)

Reducing the unstrained bridge offset voltage at the dynamic strain port channel can allow the VT1432A to measure the channel using a more sensitive range. See Figure 3-14 for the offset DAC arrangement.

Dynamic

Buffered Output

SOURce:VOLTage

To VT1422A

(VT1539A SCP)

2:1

Mux

train

RJ-45

Cal+ Cal-

Instrument.

Amplifier

X16

hannel Buffer

8-bit offset

DAC

CH00 CH01

Optional

Filter

2,10,100Hz

Figure 3-14. Dynamic Strain Offset DAC

32:1 Mux

CH31

Buffer

To reduce the offset voltage at each dynamic strain "Buffered Output" channel:

1. Measure an unstrained Buffered Output channel with a VT1432A/33B and place the value in a variable arbitrarily called <offset_v>.

2. Send minus <offset_v> to that channel with the SOUR:VOLT command. For example: SOUR:VOLT <-offset_v>,(@10000)

Note With a 13 mV resolution, the offset DAC can reduce the Buffered Output

channel offset to within a few millivolts of zero.

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 75Chapter 3

Remote Strain Channel Addressing

Figure 3-15 shows the relationship between SCP positions and Remote Channel Addressing through the VT1539A SCP (see Figure 2-1 on page 36 to compare with On-Board Channel Addressing). Not all SCP positions need to contain VT1539As. If needed, VT1539As can be mixed with other analog sense, source, and digital I/O SCPs.

Channels measured through Remote Signal Conditioning Units like the VT1529A/B Remote Strain Conditioning Unit are addressed with five digit channels specifiers rather than the traditional on-board channel’s three digit specifier. Both three and five digit specifier start with a "1." This is the SCPI "card number" digit and is retained in the VT1422A for SCPI compatibility. The next two digits complete the specification of an on-board channel. When used in a five digit remote multiplexed channel specifier, the first three digits mean the same as in the on-board specifier. Digits two and three specify the VT1539A SCP sense channel that is connected to a particular Remote Strain Conditioning Unit. Only the first two on-board channels are ever specified with the VT1539A Remote Channel SCP. So, digits two and three will specify channels 00, 01, 08, 09, 16, 17, 24, 25, 32, 33, 40, 41, 48, 49, 56, or 57. This allows the VT1422A to address up to sixteen VT1529A/Bs. Digits four and five specify one of 32 channels on the RSCU and can range from 00 to 31.

Example channel addresses (shown in SCPI channel list syntax), see Figure 3-15 also:

Runtime Remote

Scan Verification

Ch 0 on VT1529A/B connected to on-board chan 0 (VT1539A in SCP posit ion 0).

(@10000)

Ch 0 on VT1529A/B connected to on-board chan 1 (VT1539A in SCP posit ion 0).

(@10100)

Ch 24 on VT1529A/B connected to on-board chan 48 (VT1539A in SCP position 6).

(@14824)

Of course, in the Scan List, the channel list syntax allows a range of channels to be specified. Here are some examples:

channels 0 to 31 on each of the two VT1529A/Bs connected to on-board channels 0 and 1 (VT1539A in SCP position 0). This is 64 Chs.

(@10000:10131)

channels 0 to 15 on the VT1529A/B connected to on-board channel 24 (VT1539A in SCP position 3).

(@12400:12415)

combined previous two examples into a single scan list to show combining ranges.

(@10000:10131,12400:12415)

The VT1422A provides a method to verify that remote channels in the scan list defined in algorithms or with the ROUTe:SEQuence DEFine command are successfully scanned in each RSCU. See “Runtime Remote Scan Verification” on page 98, “The Operating Sequence” on page 133 and “Runtime Remote Scan Verification” on page 187.

76 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

VT1539A SCP

Position 0

(on-board addresses 00-01)

ermina

Module

VT1529A/B Remote Strain

32 Addresses 0000 - 0031

VT1529A/B Remote Strain

32 Addresses 0100 - 0131

Note: Each channel line represents

Both a Hi and Lo signal line.

Range Amp

16-Bits

A/D

Converter

VT1539A SCP

Position 1

(on-board addresses 08-09)

VT1539A SCP

Position 2

(on-board addresses 16-17)

VT1539A SCP

Position 3

(on-board addresses 24-25)

VT1539A SCP

Position 4

(on-board addresses 32-33)

Module

Terminal

VT1529A/B Remote Strain

32 Addresses 0800 - 0831

VT1529A/B Remote Strain

32 Addresses 0900 - 0931

VT1529A/B Remote Strain

32 Addresses 1600 - 1631

VT1529A/B Remote Strain

32 Addresses 1700 - 1731

VT1529A/B Remote Strain

32 Addresses 2400 - 2431

VT1529A/B Remote Strain

32 Addresses 2500 - 2531

VT1529A/B Remote Strain

32 Addresses 3200 - 3231

VT1529A/B Remote Strain

32 Addresses 3300 - 3331

VT1539A SCP

Position 5

(on-board addresses 40-41)

VT1539A SCP

Position 6

(on-board addresses 48-49)

VT1539A SCP

Position 7

(on-board addresses 56-57)

Figure 3-15. Remote Strain Channel Addressing

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 77Chapter 3

VT1529A/B Remote Strain

32 Addresses 4000 - 4031

VT1529A/B Remote Strain

32 Addresses 4100 - 4131

VT1529A/B Remote Strain

32 Addresses 4800 - 4831

VT1529A/B Remote Strain

32 Addresses 4900 - 4931

VT1529A/B Remote Strain

32 Addresses 5600 - 5631

VT1529A/B Remote Strain

32 Addresses 5700 - 5731

Programming for Remote Strain Measurement

This programming section is focused exclusively on programming the VT1422A and VT1529A/B for remote strain measurement. For more general VT1422A programing see Chapter 4 “Programming the VT1422A for Data Acquisition and Control”.

Power-on and *RST

Configuration

Some of the programming operations that follow may already be set after Power-on or after an *RST command. Where these default settings coincide with the configuration settings required, there is no need to execute a command to set them. These are the default settings:

•No channels defined in scan list.

•Programmable SCPs configured to their Power-on defaults.

•VT1529A/B input filters:

-- INPut:FILTer:FREQuency 10,(@<all channels>)

-- INPut:FILTer:STATe ON,(@<all channels>)

•All analog input channels linked to the EU conversion for voltage.

•ARM:SOURce IMMediate

•TRIGger:SOURce TIMer

•TRIGger:COUNt 1

•TRIGer:TIMer .010 (10 ms)

•FORMat ASC,7 (ASCII)

•SENSe:DATA:FIFO:MODE BLOCking

•The defaults for the STRain Subsystem when SENS:FUNC:STRain is

selected will be:

-- Unstrained voltage for all strain channels is assumed to be zero.

-- Gage factor for all strain channels is assumed to be 2.

-- Excitation voltage for all strain channels is assumed to be 1.0E6 (must be changed to actual value to make reasonable measurements).

•The default for the VT1529A/B strain configuration switches is:

-- Full Bridge (FBEN) on all 32 Channels (SENS:STR:BRID FBEN).

-- Bridge output sensed.

Description of

Strain Measurement

CALibration First To make proper measurements, *CAL? and CAL:REMote? should have

78 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

This section describes the three ways to make strain measurements with the VT1529A/B. It includes references to SCPI commands as well as command sequences to perform the strain measurements described.

been done first. Perform *CAL? and CAL:REMote? before making important measurement runs or if the temperature of the instrument’s environment has changed significantly. Remember, the accuracy specifications given in Appendix A on page 419 depend on recent *CAL? and CAL:REMote? operations.

Measure Strain Using

Built-in Strain EU

Conversion

This method lets the VT1422A convert the strain bridge readings to units of strain (∈) before they are stored in the CVT and/or FIFO or accessed by algorithms. There is no speed penalty allowing the VT1422A to make the Engineering Unit conversion to strain. In fact, this is considered the "normal" VT1422A measurement method.

When the command SENSe:FUNC:STRain:<bridge_type> is sent, the specified bridge type is configured by switches in each VT1529A/B, the channel inputs are connected to the bridge outputs (see Figure 3-10 through Figure 3-12 starting on page 70) and when the INIT command is sent, bridge voltage readings are automatically converted to strain before being stored into the FIFO buffer and/or CVT (current value table).

Before the VT1422A can convert a channel’s bridge output voltage reading to strain, the gage factor, the excitation voltage and the unstrained reference voltage for that channel must be known.

The user provides the above information to the VT1422A and below are the methods/commands to do so:

1. The gage factor default is 2.00 for each channel. To change any channel’s gage factor value, use the SENSe:STRain:GFACtor command.

and there is significant convenience in

2. The unstrained reference voltage default value is 0.0 on each channel. There are two ways to change any channel’s value.

a. Use the MEAS:VOLTage:UNSTrained? query (recommended)

which will take an average of 32 voltage readings on each specified channel and save the values internally for use later by the strain EU conversion process. When using this method, loaded algorithms are not executed to avoid putting extraneous readings into the FIFO buffer. The voltage readings are also sent to the FIFO buffer for review.

b. Measure the voltage directly using the following series of

commands:

ROUTe:SEQ:DEFine (input the list of channels to measure) SENSe:FUNC:VOLT (set measurement to voltage) INIT (take the measurement) SENS:DATA:FIFO? (read the data)

Next, the unstrained voltage values read above must be sent back to the VT1422A’s EU conversion routine by using the command: SENS:STRain:UNST <voltage value>,channel list

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 79Chapter 3

Note If an algorithm is loaded while method "b" is used, the FIFO may contain

more than just the unstrained voltage readings. It is up to the user to obtain the correct data and input it into the VT1422A.

3. The power-on and *RST excitation voltage value is 1.0E6; this value was chosen purposely so that obviously bad readings would result if this value was not changed to the true excitation voltage. This value MUST be changed to obtain reasonable reading values. There are two ways to change any channel’s value:

a. Use the MEAS:VOLTage:EXCitation? query (recommended)

which will take an average of 32 voltage readings on each specified channel(s) and save the value(s) internally for later use by the strain EU conversion process. When using this method, any loaded algorithm(s) are not executed to avoid putting extraneous values into the FIFO buffer. The voltage readings are also sent to the FIFO buffer for review later if desire.

b. Measure the voltage directly using the following series of

commands:

ROUTe:SEQ:DEFine (input the list of channels to measure) SENSe:FUNC:VOLT (sets measurement to voltage) INIT (assuming trigger system defaults, starts single scan) SENS:DATA:FIFO? (reads the data)

Next, the excitation voltage values read in above must be sent back to the VT1422A’s EU conversion routine by using the command: SENS:STRain:EXC <voltage value>,(@<channel>)

Note If an algorithm is loaded while method "b" is used, it will execute and may

place values in the FIFO in addition to the unstrained voltage readings. It is up to the user to obtain the correct data and input it into the VT1422A.

Figure 3-16 shows the sequence of commands to measure remote strain channels using the built-in strain Engineering Unit Conversion routines.

80 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Periodic Calibration

*CAL? and CALibration:REMote?

To convert readings to

Engineering Units of strain

Set Input Filter on VT1529A/B

Send gage factors to

channel EU routines

Measure bridge excitation

voltages and send to EU routines

Measure unstrained bridge output

voltages and send to EU routines

Set up the analog input Scan List

Set up Trigge r System to scan

strain bridge channels

Set up Sample Timer for best channel-to-channel scan rate

SENSe:FUNCtion:STRain: . Also sets<bridge_type> bridge config switches and turns on excitation V

INPut:FILTer:FREQuency and INPut:FILTer:STATe

SENSe:STRain:GFACtor

MEASure:VOLTage:EXCitation?

MEASure:VOLTage:UNSTrained?

ROUTe:SEQuence:DEFine

TRIG:SOURce, TRIG:COUNt, ARM:SOURce TRIG:TIMer

SAMPle:TIMer

Initiate Trigge r System

Trigger event for each pass

through Scan List

Retrieve readings from

FIFO and/or CVT

Figure 3-16. Sequence for Built-in Strain EU Conversion

INITiate[:IMMediate]

TRIG[:IMM], *TRG (if TRIG:SOUR HOLD), EXTernal trig, TTLTRGn signal, or TR IG:TIMer

SENSe:DATA:FIFO:..., SENSe:DATA:CVTable?

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 81Chapter 3

Built-in EU Conversion

Command Sequence

Below is an example VXIplug&play command sequence. Note that this is not executable; it has been simplified for easier reading. The C++ example source file (euseq.cpp) is on the CD supplied with the instrument. View the readme.txt file provided with the VXIplug&play driver for example program file location.

/* set Engineering Units (function) to strain */ errStatus=hpe1422_cmd(sessn,"sens:func:str:hben auto,(@10000:10003)"); errStatus=hpe1422_cmd(sessn,"sens:func:str:fben auto,(@10004:10007)");

/* optionally set VT1529A/B input filters (2, 10 or 100Hz) */ errStatus = hpe1422_cmd(sessn,"input:filter:frequency 10,(@10000:10007)"); /* optionally enable VT1529A/B input filters (approx 100 kHz when OFF) */ errStatus = hpe1422_cmd(sessn,"input:filter:state ON,(@10000:10007)");

/* send gage factors to channel EU conversion routines */ errStatus=hpe1422_cmd(sessn,"sense:strain:gfactor 2,(@10000:10003)"); errStatus=hpe1422_cmd(sessn,"sense:strain:gfactor 2.5,(@10004:10007)");

/* measure the excitation voltage at each bridge. The values go to the channel EU conversion as well as the FIFO. We'll clear the FIFO */ errStatus=hpe1422_cmdInt16_Q(sessn,"meas:volt:excitation? (@10000:10007)", &result16); errStatus=hpe1422_cmd(sessn,"sense:data:fifo:reset"); /* throw away exc readings */

/* measure the unstrained bridge voltage at each bridge. The values go to the channel EU conversion as well as the FIFO. We'll clear the FIFO */ errStatus=hpe1422_cmdInt16_Q(sessn,"meas:volt:unstrained? (@10000:10007)", &result16); errStatus=hpe1422_cmd(sessn,"sense:data:fifo:reset"); /* throw away exc readings */

/* set up the scan list to include the strain channels to measure */ errStatus=hpe1422_cmd(sessn,"route:sequence:define (@10000:10007)");

/* set up the trigger system to make one scan for each trigger. Note that the default is one scan per trigger and trigger source is TIMer, so we only have to INITiate the trigger system to take readings. */ errStatus=hpe1422_cmd(sessn,"trigger:count 1"); /* *RST default */ errStatus=hpe1422_cmd(sessn,"trigger:source TIMer"); /* *RST default */ errStatus=hpe1422_cmd(sessn,"arm:source IMMediate"); /* *RST default */

/* set up the sample timer. This controls the channel to channel scan rate and can be important when channels need more than the default 40 microsecond sample time. */ errStatus=hpe1422_cmd(sessn,"sample:timer 40E-6"); /* *RST default */

/* set the data FIFO format from a command module to 64-bit */ errStatus=hpe1422_cmd(sessn,"FORM PACK,64");

/* INITiate the trigger system to execute a measurement scan */ errStatus=hpe1422_cmd(sessn,"INIT:IMMediate");

/* retrieve readings from FIFO. Notice that for each scan, we read the number of values in the FIFO (sens:data:fifo:count?), then apply that value to control the number of readings we read with the hpe1422_readFifo_Q() function. For continuous data acquisition, see Chapter 4 of the manual under "Reading Fifo Data." */ errStatus=hpe1422_cmd(sessn,"INIT:IMMediate");

/* find the number of readings present in the FIFO */ errStatus=hpe1422_cmdInt32_Q(sessn,"sense:data:fifo:count?",&result32);

/* read the values from the FIFO. count returns number actually read */ errStatus=hpe1422_readFifo_Q(sessn, result32, 65024, f64_array, &count);

82 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Measure Strain Using

User Specified EU

Conversion

The VT1422A measures voltage and then applies a conversion routine (linear) supplied by the user. The user must supply the slope (M) and offset (B) of a linear M*volt + B conversion.

The DIAGnostic:CUSTom:MXB <slope>,<offset>,(@<ch_list>) command is used to supply the slope and offset for the strain conversion. To select the custom linear conversion to be used, the command SENSe:FUNCtion:CUSTom [<range>,](@<ch_list>) must be sent before starting measurements with the INIT command.

Before taking a measurement the following must be done:

1. The type of bridge connection must be specified using the [SENSe:]STRain:BRIDge[:TYPE] <select>,(@<ch_list>) command. The allowable values for <select> are: FBEN, HBEN, Q120 (quarter bridge, 120 Ω), Q350 (quarter bridge, 350 Ω) or USER (quarter bridge, with the user supplied resistor). The power-on and *RST default setting is FBEN.

2. Configure channels to measure their strain bridge outputs rather than their excitation supply. This is done by sending the [SENSe:]STRain:CONNect BRIDge,(@<ch_list>) command. The power on and reset setting is BRIDge.

3. Turn on excitation voltage to the strain bridges with the SENSe:STRain:EXCitation:STATe ON,(@<ch_list>) command.

4. The linear conversion slope and offset (M and B) must be input via the DIAG:CUST:MXB command as mentioned above. The user must supply M and B, both of which are functions of the excitation voltage, the unstrained reference and the gage factor.

5. The VT1422A must be told to use the custom conversion when taking measurements. This is done by sending the SENSe:FUNC:CUSTom [<range>,](@<ch_list>) command.

Figure 3-17 shows the sequence of commands to convert remote measurements according to the user’s own downloaded EU conversion method.

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 83Chapter 3

Set bridge configuration switches

SENSe:STRain:BRIDge[:TYPE]

Set Input Filter on VT1529A/B INPut:FILTer:FREQuency and INPut:FILTer:STATe

Enable excitation voltage

to the strain bridges

Measure bridge excitation

voltages and retrieve from FIFO

Measure unstrained bridge output

voltages and retrieve from FIFO

M(slope)=<your equation>

B(offset)=<your equation>

Download your linear EU conversion

Convert readings using your custom

EU conversion

Set up the analog input Scan List

Set up Trigger System to scan

strain bridge channels

SENSe:STRain:EXCitation:STATe

MEASure:VOLTage:EXCitation? SENS:DATA:FIFO:PART?

MEASure:VOLTage:UNSTrained? SENSE:DATA:FIFO:PART?

solve your equation for M and B as a function of V

unstrained

and V

excitation

and Gage Factor

DIAGnostic:CUSTom:MXB , ,(@ )<M> <B> <ch_list>

SENS:FUNC:CUST <range>,(@ )<ch_list>

ROUTe:SEQuence:DEFine

TRIG:SOURce, TRIG:COUNt, ARM:SOURce TRIG:TIMer

Set up Sample Timer for best

channel-to-channel scan rate

Initiate Trigger System

Trigger event for each pass

through Scan List

Retrieve readings from

FIFO and/or CVT

SAMPle:TIMer

INITiate[:IMMediate]

TRIG[:IMM], *TRG (if TRIG:SOUR HOLD), EXTernal trig, TTLTRGn signal, or TRIG:TIMer

SENSe:DATA:FIFO:..., SENSe:DATA:CVTable?

Figure 3-17. Sequence for User’s Custom EU Conversion

84 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Custom EU Conversion

Command Sequence

Below is an example VXIplug&play command sequence. Note that this is not executable; it has been simplified for easier reading. The C++ example source file (mxbseq.cpp) is on the CD supplied with the instrument. View the readme.txt file provided with the VXIplug&play driver for example program file location.

/* set bridge configuration switches */ errStatus=hpe1422_cmd(sessn,"sens:str:bridge fben,(@10000:10007)");

/* optionally set VT1529A/B input filters (2, 10 or 100 Hz) */ errStatus = hpe1422_cmd(sessn,"input:filter:frequency 10,(@10000:10007)"); /* optionally enable VT1529A/B input filters (approx 100 kHz when OFF) */ errStatus = hpe1422_cmd(sessn,"input:filter:state ON,(@10000:10007)");

/* enable excitation voltage to strain bridges. Note that excitation is switched in banks of channels. So "VT1529A/B relative" channels to switch are 0, 8, 16 and 24. The channel-range shown works too and is easier. */ errStatus=hpe1422_cmd(sessn,"sense:strain:excitation:state ON,(@10000:10007)");

/* set the data FIFO format for the command module to 64-bit */ errStatus=hpe1422_cmd(sessn,"FORM PACK,64");

/* measure the excitation voltage at each bridge. The values go to the FIFO. We'll put them in their own array */ errStatus=hpe1422_cmdInt16_Q(sessn,"meas:volt:excitation? (@10000:10007)", &result16);

/* read the values from the FIFO. count returns number actually read */ errStatus=hpe1422_readFifo_Q(sessn, 0, 512, exc_array, &count);

/* read the values from the FIFO. count returns number actually read */ errStatus=hpe1422_readFifo_Q(sessn, 0, 512, uns_array, &count);

/************************ Custom EU Pre-processing *************************** * * * Solve your custom equation for M (slope) and B (offset) as a function * * of channel Vexcitation (exc_array), Vunstrained (uns_array) and * * gage factor. * * For this example, we'll just fix M and B at 2 and 0 respectively. * * * * **************************************************************************

M=2; B=0;

/* download your derived Ms and Bs. We show downloading the same M and B to all 8 channels. For highest accuracy, you would generate M and B for each channel to account for the channel-to-channel variability of the unstrained and excitation values measured. */

/* create scpi command string with M, B and channel list */ sprintf( cmd_str, "diag:cust:mxb %f, %f,(@%s)", M, B, "10000:10007");

errStatus=hpe1422_cmd(sessn,cmd_str); /* link your derived linear EU conversion(s) to the required channels */

errStatus=hpe1422_cmd(sessn,"sens:func:custom (@10000:10007)"); /* set up the scan list to include the strain channels to measure bridge outputs */

errStatus=hpe1422_cmd(sessn,"route:sequence:define (@10000:10007)"); /* set up the trigger system to make one scan for each trigger.

Note that the default is one scan per trigger and trigger source is TIMer, so we only have to INITiate the trigger system to take readings. */ errStatus=hpe1422_cmd(sessn,"trigger:count 1"); /* *RST default */ errStatus=hpe1422_cmd(sessn,"trigger:source TIMer"); /* *RST default */ errStatus=hpe1422_cmd(sessn,"arm:source IMMediate"); /* *RST default */

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 85Chapter 3

/* INITiate the trigger system to execute a measurement scan */ errStatus=hpe1422_cmd(sessn,"INIT:IMMediate");

/* find the number of readings present in the FIFO */ errStatus=hpe1422_cmdInt32_Q(sessn,"sense:data:fifo:count?",&result32);

/* read the values from the FIFO. count returns number actually read */ errStatus=hpe1422_readFifo_Q(sessn, result32, 512, brdg_array, &count);

Measure Bridge Voltages

and Convert to Strain

If this method is desired, voltage measurements will be made at the strain bridges while unstrained, then again while under strain. The excitation voltage will also be measured at each bridge. Using this data as well as the gage factor, strain conversion equations can be calculated in the computer.

1. Set the measurement function to voltage with the [SENSe:]FUNC:VOLT <range>,(@<ch_list>) command.

2. The type of bridge connection must be specified using the [SENSe:]STRain:BRIDge[:TYPE] <select>,(@<ch_list>) command. The allowable values for <select> are: FBEN, HBEN, Q120 (quarter bridge, 120 Ω), Q350 (quarter bridge, 350 Ω) or USER (quarter bridge, with the user supplied resistor). The power-on and *RST default setting is FBEN.

3. Configure channels to measure their strain bridge outputs rather than their excitation supply. This is done by sending the [SENSe:]STRain:CONNect BRIDge,(@<ch_list>) command. The power on and reset setting is BRIDge.

4. Use the MEAS:STR:UNSTrained? (@<ch_list>) query to read the voltage on each specified channels while the bridges are unstrained. This command which will take an average of 32 voltage readings on each channel and save the values to the FIFO buffer. The command returns the number of readings in the FIFO. When using this method, loaded algorithms are not executed to avoid putting extraneous readings into the FIFO buffer.

5. Use the MEAS:STR:EXCitation? (@<ch_list>) query to sense the excitation at each of the specified bridges. This command will take an average of 32 voltage readings on each channel and save the values to the FIFO buffer. The command returns the number of values in the FIFO. When using this method, loaded algorithm(s) are not executed to avoid putting extraneous values into the FIFO buffer.

86 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

6. Turn on excitation voltage to the strain bridges with the SENSe:STRain:EXCitation:STATe ON,(@<ch_list>) command.

7. Use the ROUTe:SEQuence:DEFine (@<ch_list>) command to define the scan list to measure the output voltage at each strain bridge. The <ch_list> specified here must match the <ch_list> specified in the two previous steps (measuring unstrained and excitation voltages).

8. Start the measurement scan with the INIT command. The default trigger system settings will execute a single measurement scan. During the scan, each channel reading is sent to the FIFO and CVT. The readings are then retrieved and used to calculate the strain for each channel using the excitation, unstrained, and strained voltage values.

Figure 3-18 shows the sequence of commands to convert bridge voltage measurements to strain by post-processing.

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 87Chapter 3

Readings returned in voltage

SENSe:FUNCtion:VOLTage

Set bridge configuration switches

Set Input Filter on VT1529A/B

Enable excitation voltage

to the strain bridges

Measure bridge excitation

voltages and retrieve from FIFO

Measure unstrained bridge output

voltages and retrieve from FIFO

Set up the analog input Scan List

Set up Trigger System to scan

strain bridge channels

Set up Sample T imer for best channel-to-channel scan rate

SENSe:STRain:BRIDge[:TYPE]

INPut:FILTer:FREQuency and INPut:FILTer:STAT

SENSe:STRain:EXCitation:STATe

MEASure:VOLTage:EXCitation? SENS:DATA:FIFO:PART?

MEASure:VOLTage:UNSTrained? SENSE:DATA:FIFO:PART?

ROUTe:SEQuence:DEFine

TRIG:SOURce, TRIG:COUNt, ARM:SOURce TRIG:TIMer

SAMPle:TIMer

Initiate Trigger System

Trigger event for each pass

through Scan List

Retrieve readings from

FIFO and/or CVT

Post-process unstrained, excitation,

gage factor, and strained values

to calculate strain

INITiate[:IMMediate]

TRIG[:IMM], *TRG (if TRIG:SOUR HOLD), EXTernal trig, TTLTRGn signal, or TRIG:TIMer

SENSe:DATA:FIFO:..., SENSe:DATA:CVTable?

Figure 3-18. Converting Bridge Voltage Measurements to Strain

Voltage Conversion

Command Sequence

Below is an example VXIplug&play command sequence. Note that this is not executable; it has been simplified for easier reading. The C++ example source file (voltseq.cpp) is on the CD supplied with the instrument. View the readme.txt file provided with the VXIplug&play driver for example program file location.

88 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

/* set channel function for voltage readings (autorange) */ errStatus=hpe1422_cmd(sessn,"sens:func:voltage auto,(@10000:10007)");

/* set bridge configuration switches */ errStatus=hpe1422_cmd(sessn,"sens:str:bridge fben,(@10000:10007)");

/* optionally set VT1529A/B input filters (2, 10 or 100 Hz) */ errStatus = hpe1422_cmd(sessn,"input:filter:frequency 10,(@10000:10007)"); /* optionally enable VT1529A/B input filters (approx 100 kHz when OFF) */ errStatus = hpe1422_cmd(sessn,"input:filter:state ON,(@10000:10007)");

/* set the data FIFO format for the command module to 64-bit */ errStatus=hpe1422_cmd(sessn,"FORM PACK,64");

/* read the values from the FIFO. count returns number actually read */ errStatus=hpe1422_readFifo_Q(sessn, 0, 512, exc_array, &count);

/* measure the unstrained bridge voltage at each bridge. The values go to the FIFO. We'll put them in their own array */ errStatus=hpe1422_cmdInt16_Q(sessn,"meas:volt:unstrained? (@10000:10007)", &result16);

/* read the values from the FIFO. count returns number actually read */ errStatus=hpe1422_readFifo_Q(sessn, 0, 512, uns_array, &count);

/* set up the scan list to include the strain channels to measure bridge outputs */ errStatus=hpe1422_cmd(sessn,"route:sequence:define (@10000:10007)");

/* INITiate the trigger system to execute a measurement scan */ errStatus=hpe1422_cmd(sessn,"INIT:IMMediate");

/* find the number of readings present in the FIFO */ errStatus=hpe1422_cmdInt32_Q(sessn,"sense:data:fifo:count?",&result32);

/* read the values from the FIFO. count returns number actually read */ errStatus=hpe1422_readFifo_Q(sessn, result32, 512, brdg_array, &count);

/********************** Strain post-processing *********************** * * * here you take the values for excitation (exc_array), unstrained * * (uns_array), bridge output values (brdg_array) and gage factor * * and calculate individual strain values for each channel using * * your own equations. * * * *********************************************************************/

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 89Chapter 3

Verifying Correct Bridge Completion (Shunt Cal)

Verifying bridge configurations and connections is accomplished by inserting a known resistance (shunt cal resistor) in parallel with one leg of the bridge to imbalance it by a predictable amount. The VT1529A/B provides a single, internal 50 kΩ shunt cal resistor that can be programmatically connected to each of the 32 channels, one channel at a time. The VT1529A/B also provides the same connection capability for an optional external user supplied shunt cal resistor. The user’s shunt cal resistor can be connected via the front panel "Shunt Cal Resistor" terminal block. See Figure 3-19.

Shunt

Cal

Resistor

Figure 3-19. User Shunt Cal Resistor Connection

For the following discussion, refer to Figure 3-10 through Figure 3-12. The OUTPut:SHUNt:SOURce INT | EXT,(@<ch_list>) command selects either the INTernal (built-in) or EXTernal (user supplied) shunt cal resistor. Use the OUTput:SHUNt ON | OFF,(@<ch_list>) command to actually connect the shunt cal resistor to the bridge to be tested. For OUTP:SHUN, <ch_list> may specify only a single channel on any one VT1529A/B. This is because a single resistor is used to shunt each of a VT1529A/B’s 32 channels. When the command is sent to connect another channel, the previously closed channel is opened.

T o perform shunt cal on mult iple channels, the program will have to enter a loop to connect the shunt cal resistor to sequential channels and read the result from the shunted channel. Generally, only OUTP:SHUN OFF needs to be sent to open the last channel closed on a particular VT1529A/B. For quarter bridge completion, the shunt cal resistor is connected locally (on-board the VT1529A/B). For both half and full bridge completion, the shunt cal resistor is connected remotely via the -Real and +Real terminals. The switches that route Real are automatically controlled by the bridge configuration commands [SENSe:]FUNCtion:Q120, [SENSe:]FUNCtion:Q350, [SENSe:]FUNCtion:USER, [SENSe:]FUNCtion:HBEN, [SENSe:]FUNCtion:FBEN, and [SENSe:]STRain:BRIDge[:TYPE].

See Figure 3-20 for a general shunt cal programming sequence. A C++ example source file (shuntcal.cpp) is available in the VXIplug&play help file and on the CD supplied with the instrument. View the readme.txt file provided with the VXIplug&play driver for example program file location.

90 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Measure bridge excitation

voltages and get from FIFO

MEASure:VOLTage:EXCitation?/SENSe:DATA:FIFO?

Measure unstrained bridge output

voltages and get from FIFO

Send gage factors to

channel EU routines

To convert readings to

Engineering Units of strain

Measure unstrained bridge output

voltages and send to EU routines

Set up Trigger System to scan

strain bridge channel

Set up the analog input Scan List to

measure un-shunted channels

Initiate Trigger System

Retrieve un-shunted strain

readings from FIFO

MEASure:VOLTage:UNSTrained?/SENSe:DATA:FIFO?

SENSe:STRain:GFACtor

SENSe:FUNCtion:STRain:<bridge_type>. Also sets bridge config switches and turns on excitation V

MEASure:VOLTage:UNSTrained?

TRIG:SOURce IMM

ROUTe:SEQuence:DEFine (@ )<ch_list>

INITiate[:IMMediate]

SENSe:DATA:FIFO?

Select INTernal or EXTernal

shunt resistor

Set up the analog input Scan List to

measure single shunted channel

Turn on shunt resistor

to slected channe l

Initiate Trigger System

(measure shunted strain channel)

Retrieve shunted strain

reading from FIFO

Figure 3-20. Performing Shunt Calibration

OUTPut:SHUNt:SOURce

ROUTe:SEQuence:DEFine (@ )<shunt_channel>

OUTPut:SHUNt:STATe ON (@ )<shunt_channel>

INITiate[:IMMediate]

SENSe:DATA:FIFO?

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 91Chapter 3

Built-in Strain Conversion Equations

When using the VT1422A’s built-in strain conversion (SENSe:FUNCtion:STRain:<bridge_type> <range>,(@<ch_list>)), the following equations are used to convert voltage to strain.

Full Bridge Equation

(bridge_type=FBEN)

Half Bridge Equation

(bridge_type=HBEN)

Quarter Bridge Equation

(bridge_type=Q120, Q350

or USER)

This equation is used by the VT1422A to convert bridge measurements to Engineering Units of Strain for channels specified in the command SENSe:FUNCtion:STRain:FBEN <range>,(@<ch_list>).

Strain V

measuredVunstrained

where: V

–()gFactor V

= measured voltage value

measured

V V

= excitation voltage

excitation

= unstrained voltage

unstrained

×()⁄=

excitation

gFactor = gage factor

This equation is used by the VT1422A to convert bridge measurements to Engineering Units of Strain for channels specified in the command SENSe:FUNCtion:STRain:HBEN <range>,(@<ch_list>).

Strain 2 V

measuredVunstrained

where: V

V V

–()gFactor V

= measured voltage value

measured

= excitation voltage

excitation

= unstrained voltage

unstrained

×()⁄×=

excitation

gFactor = gage factor

This second-order equation is used by the VT1422A to convert bridge measurements to Engineering Units of Strain for on-board strain SCP channels only. Because VT1529A/Bs can expand the VT1422As strain channel count to 512, use of this non-linear strain conversion equation would require too much VT1422A memory. Instead, a quadratic approximation of this equation is used. See below. For the following equations, V

and V

= bridge output while strained, Vu = bridge output unstrained

= excitation voltage at the bridge.

Quarter Bridge Equation for Strain SCPs only

Strain

-------------------------------

= WhereV

GF 12V

–()

ViVu–

---------------- -

Quarter Bridge Equation for VT1529A/B only

a1Via

Strain a

Where a

92 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

2Vi

-------------------- -

GF V

++=

, a

44VuVe–()–

--------------------------------

GF V

42V

, a

------------------------------------

===

VeV

–()

GF V

Error Analysis

Figure 3-21 compares the non-linear quarter bridge equation used for strain SCPs with the linear approximation used with the VT1529A/B. Notice that while the error is independent of excitation voltage and unstrained voltage, error is quite sensitive to gage factor.

Error vs Delta Strain

6000

5000

4000

3000

2000

Error in microstrain (µε)

1000

-100000 -80000 -60000 -40000 -20000 0 20000 40000 60000 80000 100000

GF=1

GF=2

GF=5

-1000

Delta S tra in in m icros train (µε)

Figure 3-21. Error of Quarter Bridge Linear Approximation

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 93Chapter 3

94 Programming the VT1422A & VT1529A/B for Remote Strain Measurement Chapter 3

Chapter 4

Programming the VT1422A for

Data Acquisition and Control

About This Chapter The focus in this chapter is to show the VT1422A’s general programming

model. The programming model is basically the sequence of SCPI commands the application program will send to the VT1422A to configure it to execute the defined Scan List and/or algorithms. This chapter contains:

• Overview of the VT1422A Multifunction DAC Module . . . . page 96

Multifunction DAC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 97

Flexible Signal Conditioning for Input and Output . . . . page 97

Remote Multiplexing and Signal Conditioning . . . . . . . page 97

Programmable Signal Conditioning and EU Conversion page 98 Scan List and/or C Language Control Programming . . . page 98

Runtime Remote Scan Verification. . . . . . . . . . . . . . . . . page 98

Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 102

• Executing the Programming Model . . . . . . . . . . . . . . . . . . . page 104

Programming Overview Diagram. . . . . . . . . . . . . . . . . . . page 106

-- Setting up Analog Input and Output Channels . . . . . . . . . page 107

Configuring Programmable Analog SCP Parameters. . page 107

Linking Input Channels to EU Conversion. . . . . . . . . . page 109

Linking Output Channels to Functions. . . . . . . . . . . . . . page 117

-- Setting Up Digital Input and Output Channels. . . . . . . . . . page 118

Setting Up Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . page 118

Setting Up Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . page 119

-- Performing Channel Calibration (Important!) . . . . . . . . . page 122

Calibrating the VT1422A . . . . . . . . . . . . . . . . . . . . . . . page 122

Calibrating Remote Signal Conditioning Units . . . . . . page 123

-- Defining an Analog Input Scan List (ROUT:SEQ:DEF) . page 123

-- Defining C Language Algorithms. . . . . . . . . . . . . . . . . . . page 125

Global Variable Definition . . . . . . . . . . . . . . . . . . . . . . page 126

Algorithm Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . page 126

Pre-setting Algorithm Variables . . . . . . . . . . . . . . . . . . page 126

-- Defining Data Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . page 127

Specifying the Data Format . . . . . . . . . . . . . . . . . . . . . page 127

Selecting the FIFO Mode . . . . . . . . . . . . . . . . . . . . . . . page 128

-- Setting up the Trigger System. . . . . . . . . . . . . . . . . . . . . . page 129

Arm and Trigger Sources . . . . . . . . . . . . . . . . . . . . . . . page 129

Programming the Trigger Timer . . . . . . . . . . . . . . . . . . page 131

-- INITiating the Module/Starting Scanning and Algorithms page 132

The Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . page 133

Programming the VT1422A for Data Acquisition and Control 95Chapter 4

-- Reading Running Algorithm Va lues . . . . . . . . . . . . . . . . . page 134

Reading CVT Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 134

Reading FIFO Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 135

Which FIFO Mode? . . . . . . . . . . . . . . . . . . . . . . . . . . . page 135

Reading Algorithm Variables Directly . . . . . . . . . . . . . page 137

-- Modifying Running Algorithm Variables . . . . . . . . . . . . . page 138

Updating Algorithm Variables and Coefficients . . . . . . page 138

Enabling and Disabling Algorithms . . . . . . . . . . . . . . . page 138

Setting Algorithm Execution Frequency. . . . . . . . . . . . page 139

• Example SCPI Command Sequence. . . . . . . . . . . . . . . . . . . page 139

• Example VXIplug&play Driver Function Sequence . . . . . . page 140

• Using the Status System . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 142

• VT1422A Background Operation. . . . . . . . . . . . . . . . . . . . . page 148

• Updating the Status System and VXIbus Interrupts . . . . . . . page 149

• Creating and Loading Custom EU Conversion Tables. . . . . page 150

• Compensating for System Offsets. . . . . . . . . . . . . . . . . . . . . page 153

• Detecting Open Transducers. . . . . . . . . . . . . . . . . . . . . . . . . page 155

• More On Auto Ranging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 156

• Settling Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 157

Overview of the VT1422A Multifunction DAC Module

This section describes how the VT1422A gathers input data, executes its 'C' algorithms and sends its output data. Figure 4-1 shows a simplified functional block diagram.

96 Programming the VT1422A for Data Acquisition and Control Chapter 4

Remote Sig. Cond. Unit

(like VT1529A)

Trigger T im er

Remote

Channels

VT1539A

Voltage

Temperature

Resistance

Strain

Sample/Hold

Digital State

Frequency

Totalize

Digital Signal Processor (DSP)

Analog Input S CPs

Digital Input SC Ps

Analog Multiplex er

A/D

Main Program

C Algorithm Code

Global Data

Trigger System

EU Conversion

Input Buffer

(I100-I163)

A24 Program/Data Memory

static float profile[ 100 ]; main() {

if ( State_1 ) alg1();

}

alg1() {

static float in_val, j; in_val = I100 - 5.3;

O108 = in_val * profile[j]; writecvt( inval, 10 ); writefifo( O101 );

}

Output

System

Output Buffer (O100-O163)

Voltage

Current

Digital Output SCP sAnalog Output SCPs

Static States

Pulse per Trigger

Pulse Width Mod

Frequency Mod.

A16

Command

Current

Value Table

(CVT)

VXIbus

FIFO

Buffer

Figure 4-1. Simplified Functional Block Diagram

Multifunction DAC? The VT1422A is a complete data acquisition and control system on a single

VXI card. It is multifunction because it uses the Signal Conditioning Plug-on (SCP) concept whereby analog input/output and digital input/output channels can be mixed and matched to meet various application needs. It can be self-contained because it has local intelligence to permit the card to run stand-alone with very little interaction required from the supervisory computer.

Flexible Signal

Conditioning for Input

and Output

Remote Multiplexing and

Signal Conditioning

The VT1422A has eight SCP positions with each SCP position capable of addressing up to eight channels of input or eight channels of output for a total of 64 channels. These 64 channels are known as the on-board channels. The eight SCP slots can be used for any of the analog/digital SCPs available for the VT1422A which cover most data acquisition and control needs.

In addition, each SCP slot that contains a VT1539A SCP can operate two Remote Signal Conditioning Units (RSCUs) that externally multiplex up to 32 channels each. These channels are known as remote channels because they are multiplexed remotely to the VT1422A. So, with 32 channels per RSCU and 16 RSCUs, the VT1422A can make analog measurements on 512 remote channels. The upper left corner of Figure 4-1 shows how Remote Signal Conditioning Units fit in.

Programming the VT1422A for Data Acquisition and Control 97Chapter 4

Programmable Signal

Conditioning and EU

Conversion

The input and output SCPs are configured with the SCPI and/or VXIplug&play programming. Analog SCPs are measured with the VT1422A’s A/D. Configuring the analog SCPs include specifying what type of Engineering Unit (EU) conversions are desired for each analog input channel. For example, one channel may require a type T thermocouple conversion and another may be a resistance measurement. The on-board Digital Signal Processor (DSP) converts the voltage read across the analog input channel and applies a high-speed conversion which results in temperature, resistance, etc. Digital input SCPs perform their own conversions as configured by the SCPI language.

Scan List and/or

C Language Control

Programming

Runtime Remote

Scan Verification

Operational

Overview

The VT1422A can be used as either a conventional Scan List controlled data acquisition unit with analog measurements automatically buffered and available to the supervisory computer or the VT1422A can execute its own internal ’C’ language algorithms which can perform data acquisition and control and pass values to the supervisory computer when required. Of course, both modes can be used for example when many analog data acquisition channels need to be measured using the Scan List and one or more algorithms are needed to perhaps monitor some of the data points and make control decisions.

The VT1422A provides a method to verify that remote channels in the scan list defined in algorithms or with the ROUTe:SEQuence DEFine command are successfully scanned in each RSCU. Special algorithm variables are available to check the operating status of each VT1539A main channel. This provides protection against an RSCU failing to scan remote channels due to a signal cable disconnect or a power failure at the RSCU.

When the Trigger System is configured and either generates its own trigger or accepts a trigger from an external source, an instrument operation cycle begins. A simplified description of the cycle follows.

Acquire Input Values All digital input SCP's latch their current input state and the A/D starts

scanning the analog channels specified in the Scan List with the ROUTe:SEQuence:DEFine command or analog channels referenced by any ’C’ algorithms. All measurement data as seen by the ’C’ algorithms is represented as 32-bit real numbers even if the input channel is inherently integer (digital byte/word). The EU-converted numbers such as temperature, strain, resistance, volts, state, frequency, etc. from Scan List channels (ROUT:SEQ:DEF) are stored by default in the Current Value Table (CVT) and the FIFO reading buffer. Values from analog channels referenced by ’C’ algorithms are stored in an Input Buffer and later accessed by the ’C’ algorithms executing on the VT1422A card.

Analog input values from channels in the Scan List, stored in the FIFO and/or CVT can be read from the VT1422A without creating or running any ’C’ algorithms. This makes for easy traditional analog data acquisition where no control aspect is required.

98 Programming the VT1422A for Data Acquisition and Control Chapter 4

VXI VT1422A, VT1529A-B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

VXI TECHNOLOGY WARRANTY STATEMENT

U.S. Government Restricted Rights

Safety Symbols

WARNINGS

Note for European Customers

Contents

Support Resources

About this Chapter

Configuring the VT1422A

Setting the Logical Address Switch

Installing the Module

Instrument Drivers

About Example Programs

Examples on CD All example programs mentioned by file name in this manual are available on the

Verifying a Successful Configuration

About This Chapter

Planning the Wiring Layout

Faceplate Connector Pin-Signal Lists

Optional Terminal and Connector Modules

Reference Temperature Sensing with the VT1422A

Preferred Measurement Connections

Connecting the On-Board Thermistor

Wiring and Attaching the Terminal Module

Removing the VT1422A Terminal Modules

Attaching and Removing the VT1422A RJ-45 Module

Adding Components to the Terminal Module

Spring and Screw Terminal Module Wiring Maps

About This Chapter

Instrument Setup for Remote Strain Measurements

Overview Before getting into the specifics of configuring a Remote Strain Measuring

Removing the Top Cover Figure 3-2 shows how to access the printed circuit board where the user

Locating Resistors Figure 3-3 provides the relationship between P.C. board location and bridge

Installing Resistors Figure 3-4 shows a typical user selected 1/4 bridge resistor installation. Note

Spring and Screw Terminal Modules

Connecting the VT1529A/B to Strain Gages

VT1529A/B Bridge Configurations

Connecting to the VT1529A/Bs Dynamic Strain Ports

Remote Strain Channel Addressing

Programming for Remote Strain Measurement

CALibration First To make proper measurements, *CAL? and CAL:REMote? should have

Verifying Correct Bridge Completion (Shunt Cal)

Built-in Strain Conversion Equations

About This Chapter The focus in this chapter is to show the VT1422A’s general programming

Overview of the VT1422A Multifunction DAC Module

Multifunction DAC? The VT1422A is a complete data acquisition and control system on a single

Acquire Input Values All digital input SCP's latch their current input state and the A/D starts