Agilent E1422A User’s and SCPI Programming Manual

Download

HP E1422A Remote Channel

HP 75000 Series C

Multi-function DAC Module

with

HP E1529A 32ch Remote Strain Conditioning Unit and HP E1539A Remote Channel Signal Conditioning Plug-on

User’s and SCPI Programming Manual

Where to Find it - Online and Printed Information:

System installation (hardware/software)............VXIbus Configuration Guide*

HP VIC (VXI installation software)* Getting Started with VXI Guide**

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

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

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

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

VXIplug&play programm ing ............................VXIplug&play Online Help

VXIplug&play example prog ra ms.....................VXIplug&play Online Help

VXIplug&play functio n refere nce................ ... ..VXIplug&play Online Help

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

VISA language information...............................HP VISA User’s Guide

HP VEE programming information ...................HP VEE User’s Manual

*Supplied with HP Command Modules , Embedded Control le rs, and VXLink

** Supplied with HP VXI Mainframes and on WEB at www.tmo.hp.com then search for “getting started with vxi”. Search result will be “Getting Started With VXI Guide

”, click on this to download .PDF file.



Manual Part Number: E1422-90003

Printed in U.S . A . E0400

HEWLETT-PACKARD WARRANTY STATEMENT

HP PRODUCT: HP E1422A Remote Channel Multi-func tio n DAC Modu le with DURATION OF WARRANTY: 3 years

HP E1529A Remote Strain Conditioning Module and DURATION OF WARRANTY: 3 years

1. HP warrants HP hardware, accessori es and supplies against defects in mat erials and workmanship for the perio d specified above. If HP receives notice o f such defects during the warranty period, HP wi ll, at its option, either repair or replace products which prove to be defective. Replacement products may be either new or like-new.

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

3. HP does not warrant that the operation of HP products will be interrupted or error free. If HP 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. HP products may con tain remanufactured parts equivalent to new in performance or m a y 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 HP. If customer schedules or delays HP 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) software, interfacing, parts or supplies not supplied by HP, (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 HP SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OR CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, AND FITNESS FOR A PARTICULAR PURPOSE.

8. HP 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, an d 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 HP 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 HP OR ITS SUPPLIERS BE LIABLE FOR LOSS OF DATA OR FOR DIRECT, SP ECIAL, 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 LAW FULLY PERM ITTED, DO NOT EXCLUDE, RESTRICT OR MODIFY AND AR E IN ADDITION TO THE MANDATORY STATUTORY RIGHTS APPLICABLE TO THE SALE OF THIS PRODUCT TO YOU.

HP E1539A Remote Channel Signal Conditioning Plug-on and all other applicable Signal Conditioning Plug-ons DURATION OF WARRANTY: 3 years

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 i n FAR 2.101(a), or as "R estricted computer software" as define d 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 t he applicable FAR or DFARS clause or the HP st andard software agreement for the product involved.

HP E1422A Remote Channel DAC Unit User's Manual and SCPI Programming Guide

Edition 4

Documentation History

All Editions and Updates of t his manu al and th eir creati on da te are list ed belo w. The first Edition of the m anual is Ed ition 1. The Edition number increments by 1 whenever the manual is revised. Updates, which are issued between Editions, contain replacement pages to correct or add additional information to the current Edition of the manual. Whenever a new Edition is created, it will contain all of the Update information for the previous E dition. Each new Edition or Update also inc ludes a revised c opy of this do cumentation history page.

Edition 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .May 1999

Edition 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .July 1999

Edition 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .September 1999

Edition 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . February 2000

Safety Symbols

product. Indicates that the user must refer to the manual for specific WARNING or CAUTION information to av oid personal injury or damage to the product.

Indicates the field wiring te rminal that must be connected to earth ground be fore

operating the equipmentÅprotects against electrical shock in case of fault.

Frame or chassis ground terminal— typically connects t o the e quipmen t's me tal

WARNING

CAUTION

Alternating current (AC)Instruction manual symbol affixed to

Direct current (DC).

Indicates hazardous voltages.

Calls attention to a procedure, practice, or condition that could cause bodily injury or death.

Calls attention to a procedure, practice, or condition that could possibly cause damage to equipment or perm anent loss of data.

WARNINGS

The following general safety precauti ons 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. Hewlett-Packard Com pany 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 sw itche d off. To av oid danger ous ele ctric al sh ock, DO NOT perfor m pro cedure s inv olving cover or shi eld remova l unles s you are qualified to do so.

DO NOT operate damaged equipmen t: 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, REMO VE POWER and do not use the product until safe operation can be verified by service-trained personnel. If necessary, return the product to a Hewlett-Packard Sales and Service Office for service and repair 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: Becaus e of th e dang er of introd ucing addition al haz ards, do not i nstall subst itute pa rts or perform any unauthorized modification to the product. Return the product to a Hewlett-Packard Sales and Service Office for service and repair to ensure that safety features are maintained.

Operating Location: Sheltered loc a tio n whe re air tempera tu re and hu m idit y are co ntro lled within thi s pro duc t’s specifica tio ns and the product is protected against direct exposur e to clim at ic cond itio ns such as direc t sunli ght, wind , rain, snow, sleet, and icing, water spray or splash, hoarfrost or dew. (Typically, indoor.) Pollution envir onment for which this product may be operated is IEC 664 Pollution d egree

2. 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.

Declaration of Conformity

according to ISO/IEC Guide 22 and EN 45014

Manufacturer’s Name: Hewlett-Packard Company

Loveland Manufacturing Center

Manufacturer’s Address: 815 14th Street S.W.

Loveland, Colorado 80537

declares, that the product: Product Names: Remote Channel Multi-function DAC Module

Remote Channel Signal Conditioning Plug-on 32-ch Remote Strain Conditioning Unit

Model Numbers: HP E1422A

HP E1539A HP E1529A

Product Options: All options and all other applicable Signal Conditioning Plug-ons conforms to the following Product Specifications: Safety: IEC 1010-1 (1990) Incl. Amend 2 (1996)/EN61010-1 (1993)

CSA C22.2 #1010.1 (1992) UL 3111-1 (1994)

EMC: CISPR 11:1990/EN55011 (1991): Group 1 Class A

EN61000-3-2:1995 Class A EN61000-3-3:1995 EN50082-1:1992

IEC 1000-4-2:1995: 4kVCD, 8kVAD IEC 1000-4-3:1995: 3 V/m IEC 1000-4-4:1995: 1kV Power Line 0.5kV Signal Lines ENV50141:1993/prEN50082-1 (1995): 3 Vrms EN 61000-4-5:1995 1kV CM, 0.5kV DM EN61000-4-8:1993/prEN50082-1 (1995): 3 A/M EN61000-4-11:1994/prEN50082-1 (1995): 30%, 10mS 60%, 100mS

Supplementary Information: The product herewith complies with the requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC (inclusive 93/68/EEC) and carries the "CE" mark accordingly.

May 3, 1999 Jim White, QA Manager

For Compliance In f ormation ONLY, contact:

Australia Contact

Victoria 3130, Australia

: Product Regulations Manager, Hewlett-Packard Australia Ltd., 31-41 Joseph Street, Blackburn,

European Contact:

Standards Europe, Herrenberger Straβe 130, D-71034 Boblingen (FAX: +49- 7031-14-3143)

USA Contact:

80537

Your local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Department HQ-TRE,

Product Regulations Manager, Hewlett-Packard Company, P.O. Box 301, Mail Stop BU212, Loveland, CO

Notes:

ease fold and tape for ma

ili

Reader Comment Sheet

HP E1422A Remote Channel Multifunction DAC Module User’s Manual

Edition 4

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Content s

HP E1422A Remote Channel Multifunction DAC Module (Edition 3)

HEWLETT-PACKARD WARRANTY STATEMENT. . . . . . . . . . . . . . . . . . . . . 3

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

WARNINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Reader Comment Sheet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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

Chapter 1

Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

About this Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Configuring the HP E1422. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Setting the Logical Address Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Installing Signal Conditioning Plug-ons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Disabling the Input Protect Feature (optional) . . . . . . . . . . . . . . . . . . . . . . . 27

Disabling Flash Memory Access (optio nal) . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Installing the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Instrument Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

About Example Programs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Verifying a Successful Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Chapter 2

Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Planning Your Wiring Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

SCP Positions and Channel Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Sense SCPs and Output SCPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Planning for Thermocouple Measurements . . . . . . . . . . . . . . . . . . . . . . . . . 36

Faceplate Connector Pin-Signal Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Optional Terminal and Connector Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

The SCPs and Terminal Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Terminal Module Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

The RJ-45 Connector Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Spring Terminal Module Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Screw Terminal Module Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Reference Temperature Sensing with the HP E1422 . . . . . . . . . . . . . . . . . . . . . . 42

Preferred Measurement Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Contents 9

Connecting the On-board Thermistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Wiring and Attaching the Terminal Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Removing the HP E1422 Terminal Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Attaching and Removing the HP E1422 RJ-45 Module. . . . . . . . . . . . . . . . . . . . 51

Adding Components to the Terminal Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Spring and Screw Terminal Module Wiring Maps . . . . . . . . . . . . . . . . . . . . . . . 53

Chapter 3

Programming the HP E1422A & HP E1529A for Remote Strain Measurement . 55

About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Instrument Setup for Remote Strain Measurements . . . . . . . . . . . . . . . . . . . . . . 56

Preparing the HP E1422A for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Preparing the HP E1529A for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Installing User Selected 1/4 Bridge Resistors (optional) . . . . . . . . . . . . . . . . 57

Connecting HP E1529As to the HP E1422A . . . . . . . . . . . . . . . . . . . . . . . . . 60

Two Interconnect Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Connecting Excitation Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Connecting the HP E1529A to Strain Gages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Channel Connector Pin-to-Signal Relationship . . . . . . . . . . . . . . . . . . . . . . 66

HP E1529A Bridge Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Connecting to the HP E1529A’s Dynamic Strain Ports. . . . . . . . . . . . . . . . . . . . 70

Extending the Dynamic Strain Connection . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Dynamic Strain Port Offset Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Remote Strain Channel Addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Runtime Remote Scan Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Programming for Remote Strain Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . 75

Description of Strain Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Verifying Correct Bridge Completion (Shunt Cal) . . . . . . . . . . . . . . . . . . . . . . . 87

Built-in Strain Conversion Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Chapter 4

Programming the HP E1422A for

Data Acquisition and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

About This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Overview of the HP E1422A Multifunction DAC Module. . . . . . . . . . . . . . . . . . 92

Multifunction DAC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Operational Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Detailed Instrument Operation Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Executing the Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Power-on and *RST Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Setting up Analog Input and Output Channels . . . . . . . . . . . . . . . . . . . . . . . . . 103

10 Contents

Configuring Programmable Analog SCP Parameters . . . . . . . . . . . . . . . . 103

Linking Input Channels to EU Conversion . . . . . . . . . . . . . . . . . . . . . . . . . 105

Linking Output Channels to Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Setting up Digital Input and Output Channels. . . . . . . . . . . . . . . . . . . . . . . . . . 113

Setting up Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Setting up Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Performing Channel Calibration (Important!). . . . . . . . . . . . . . . . . . . . . . . . . . 117

Calibrationg the HP E1422A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Calibrating Remote Signal Conditioning Units . . . . . . . . . . . . . . . . . . . . . . 118

Defining an Analog Input Scan List (ROUT:SEQ:DEF). . . . . . . . . . . . . . . . . . 119

Defining C Language Algorithms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Global variable definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Algorithm definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Pre-setting Algorithm Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Defining Data Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Specifying th e

Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Selecting the

FIFO Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Setting up the Trigger System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Arm and Trigger Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Programming the Trigger Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Setting the Trigger Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Sending Trigger Signals to

Other Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

INITiating the Module/Starting Scanning and Algorithms. . . . . . . . . . . . . . . . 126

Starting Scanning and/or Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

The Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Reading Running Algorithm Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Modifying Running Algorithm Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Updating the Algorithm Variables and Coefficients . . . . . . . . . . . . . . . . . . 132

Enabling and Disabling Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Setting Algorithm Execution Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Example SCPI Command Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Example VXIplug&play Driver Function Sequence . . . . . . . . . . . . . . . . . . . . . 135

Using the Status System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Enabling Events to be Reported in the Status Byte . . . . . . . . . . . . . . . . . . 140

Reading the Status Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Clearing the Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

The Status Byte Group’s Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Reading Status Groups Directly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

HP E1422 Background Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Updating the Status System and VXIbus Interrupts . . . . . . . . . . . . . . . . . . . . . 143

Creating and Loading Custom EU Conversion Tables . . . . . . . . . . . . . . . . . . . 145

Contents 11

Compensating for System Offsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Special Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Detecting Open Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

More On Auto Ranging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Settling Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Checking for Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Fixing the Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Chapter 5

Creating and Running Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

Overview of the Algorithm Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

Example Language Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

The Algorithm Execution Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

The Main Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

How Your Algorithms Fit In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Accessing the E1422’s Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Accessing I/O Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Accessing Remote Scan Status Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Runtime Remote Scan Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Defining and Accessing Global Variables . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Determining

First Execution (First_loop) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Initializing Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Sending Data to the CVT and FIFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Setting a VXIbus Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

Determining Your Algorithm’s Identity (ALG_NUM) . . . . . . . . . . . . . . . . 166

Calling User Defined Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

Operating Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Overall Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Algorithm Execution Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

12 Contents

Defining Algorithms (ALG:DEF). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

ALG:DEFINE in the Programming Sequence . . . . . . . . . . . . . . . . . . . . . . 170

ALG:DEFINE’s Thre e Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Changing an Algorithm While

it’s Running . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

A Very Simple First Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Writing the Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Running the Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Modifying an Example PID Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

PIDA with digital On-Off Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Algorithm to Algorithm Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Communication Using Channel Identifiers . . . . . . . . . . . . . . . . . . . . . . . . . 175

Communication Using Global Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Non-Control Algorithms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Process Monitoring Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Implementing Setpoint Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Algorithm Language Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Standard Reserved Keywords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Special HP E1422 Reserved Keywords . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Identifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Special Identifiers for Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Special Identifiers for Remote Scan Status . . . . . . . . . . . . . . . . . . . . . . . . . 182

Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Intrinsic Functions and Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Program Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

Data Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Bitfield Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Language Syntax Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Program Structure and Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Declaring Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Assigning Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

The Operations Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Conditional Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

Comment Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

Overall Program Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Chapter 6

HP E1422 Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Using This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Overall Command Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Command Fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Common Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

SCPI Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Linking Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

SCPI Command Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

ABORt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

ALGorithm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

ALGorithm[:EXPLicit]:ARRay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

ALGorithm[:EXPLicit]:ARRay? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

ALGorithm[:EXPLicit]:DEFine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212

ALGorithm[:EXPLicit]:SCALar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

ALGorithm[:EXPLicit]:SCALar? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

ALGorithm[:EXPLicit]:SCAN:RATio . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

ALGorithm[:EXPLicit]:SCAN:RATio? . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

ALGorithm[:EXPLicit]:SIZE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

ALGorithm[:EXPLicit][:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219

ALGorithm[:EXPLicit][:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

ALGorithm[:EXPLicit]:TIME? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

Contents 13

ALGorithm:FUNCtion:DEFine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

ALGorithm:OUTPut:DELay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

ALGorithm:OUTPut:DELay? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

ALGorithm:UPDate[:IMMediate] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224

ALGorithm:UPDate:CHANnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

ALGorithm:UPDate:WINDow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

ALGOrithm:UPDate:WINDow? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227

ARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228

ARM[:IMMediate] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

ARM:SOURce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

ARM:SOURce? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230

CALibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231

CALibration:CONFigure:RESistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232

CALibration:CONFigure:VOLTage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233

CALibration:REMote? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234

CALibration:REMote:DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

CALibration:REMote:DATA? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

CALibration:REMote:STORe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

CALibration:SETup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

CALibration:SETup? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

CALibration:STORe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

CALibration:TARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238

CALibration:TARE:RESet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

CALibration:TARE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

CALibration:VALue:RESistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242

CALibration:VALue:VOLTage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242

CALibration:ZERO? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243

DIAGnostic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

DIAGnostic:CALibration:SETup[:MODE] . . . . . . . . . . . . . . . . . . . . . . . . 245

DIAGnostic:CALibration:SETup[:MODE]? . . . . . . . . . . . . . . . . . . . . . . . 246

DIAGnostic:CALibration:TARE[:OTDetect]:MODE . . . . . . . . . . . . . . . . 246

DIAGnostic:CALibration:TARE[:OTDetect]:MODE? . . . . . . . . . . . . . . . 247

DIAGnostic:CHECksum? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

DIAGnostic:CONNect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

DIAGnostic:CUSTom:MXB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

DIAGnostic:CUSTom:PIECewise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

DIAGnostic:CUSTom:REFerence:TEMPerature . . . . . . . . . . . . . . . . . . . 251

DIAGnostic:IEEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251

DIAGnostic:IEEE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252

DIAGnostic:INTerrupt[:LINe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252

DIAGnostic:INTerrupt[:LINe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252

DIAGnostic:OTDetect[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252

DIAGnostic:OTDetect[:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

DIAGnostic:QUERy:SCPREAD? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254

DIAGnostic:REMote:USER:DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254

DIAGnostic:REMote:USER:DATA? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

14 Contents

DIAGnostic:TEST:REMote:NUMber? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

DIAGnostic:TEST:REMote:SELFtest? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256

DIAGnostic:VERSion? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

FETCh?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259

FORMat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261

FORMat[:DATA] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261

FORMat[:DATA]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263

INITiate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

INITiate[:IMMediate] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

INPut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

INPut:FILTer[:LPASs]:FREQuency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

INPut:FILTer[:LPASs]:FREQuency? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

INPut:FILTer[:LPASs][:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

INPut:FILTer[:LPASs][:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

INPut:GAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268

INPut:GAIN? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268

INPut:LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

INPut:LOW? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270

INPut:POLarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270

INPut:POLarity? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271

MEASure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

MEASure:VOLTage:EXCitation? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

MEASure:VOLTage:UNSTrained? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

MEMory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276

MEMory:VME:ADDRess . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276

MEMory:VME:ADDRess? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

MEMory:VME:SIZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

MEMory:VME:SIZE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

MEMory:VME:STATe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

MEMory:VME:STATe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

OUTPut. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280

OUTPut:CURRent:AMPLitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280

OUTPut:CURRent:AMPLitude? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

OUTPut:CURRent[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

OUTPut:CURRent[:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

OUTPut:POLarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

OUTPut:POLarity? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

OUTPut:SHUNt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284

OUTPut:SHUNt? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284

OUTPut:SHUNt:SOURce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285

OUTPut:SHUNt:SOURce? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286

OUTPut:TTLTrg:SOURce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286

OUTPut:TTLTrg:SOURce? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

OUTPut:TTLTrg<n>[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

OUTPut:TTLTrg<n>[:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288

OUTPut:TYPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288

Contents 15

OUTPut:TYPE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

OUTPut:VOLTage:AMPLitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

OUTPut:VOLTage:AMPLitude? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290

ROUTe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

ROUTe:SEQuence:DEFine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

ROUTe:SEQuence:DEFine? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

ROUTe:SEQuence:POINts? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294

SAMPle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

SAMPle:TIMer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

SAMPle:TIMer? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

[SENSe]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298

[SENSe:]CHANnel:SETTling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

[SENSe:]CHANnel:SETTling? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300

[SENSe:]DATA:CVTable? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300

[SENSe:]DATA:CVTable:RESet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

[SENSe:]DATA:FIFO[:ALL]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302

[SENSe:]DATA:FIFO:COUNt? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303

[SENSe:]DATA:FIFO:COUNt:HALF? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303

[SENSe:]DATA:FIFO:HALF? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303

[SENSe:]DATA:FIFO:MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304

[SENSe:]DATA:FIFO:MODE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305

[SENSe:]DATA:FIFO:PART? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305

[SENSe:]DATA:FIFO:RESet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306

[SENSe:]FREQuency:APERture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306

[SENSe:]FREQuency:APERture? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307

[SENSe:]FUNCtion:CONDition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307

[SENSe:]FUNCtion:CUSTom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

[SENSe:]FUNCtion:CUSTom:REFerence . . . . . . . . . . . . . . . . . . . . . . . . . . 309

[SENSe:]FUNCtion:CUSTom:TCouple . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

[SENSe:]FUNCtion:FREQuency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311

[SENSe:]FUNCtion:RESistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312

[SENSe:]FUNCtion:STRain:FBENding . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

[SENSe:]FUNCtion:STRain:FBPoisson . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

[SENSe:]FUNCtion:STRain:FPOisson . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

[SENSe:]FUNCtion:STRain:HBENding . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

[SENSe:]FUNCtion:STRain:HPOisson . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

[SENSe:]FUNCtion:STRain[:QUARter] . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

[SENSe:]FUNCtion:STRain:Q120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

[SENSe:]FUNCtion:STRain:Q350 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

[SENSe:]FUNCtion:STRain:USER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

[SENSe:]FUNCtion:TEMPerature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315

[SENSe:]FUNCtion:TOTalize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

[SENSe:]FUNCtion:VOLTage[:DC] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

[SENSe:]REFerence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318

[SENSe:]REFerence:CHANnels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320

[SENSe:]REFerence:TEMPerature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320

[SENSe:]STRain:BRIDge[:TYPE] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321

16 Contents

[SENSe:]STRain:BRIDge:[TYPE]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322

[SENSe:]STRain:CONNect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322

[SENSe:]STRain:CONNect? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323

[SENSe:]STRain:EXCitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323

[SENSe:]STRain:EXCitation? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324

[SENSe:]STRain:EXCitation:STATe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324

[SENSe:]STRain:EXCitation:STATe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325

[SENSe:]STRain:GFACtor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325

[SENSe:]STRain:GFACtor? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326

[SENSe:]STRain:POISson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326

[SENSe:]STRain:POISson? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327

[SENSe:]STRain:UNSTrained . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327

[SENSe:]STRain:UNSTrained? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

[SENSe:]TOTalize:RESet:MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329

[SENSe:]TOTalize:RESet:MODE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329

SOURce. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330

SOURce:FM[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330

SOURce:FM:STATe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331

SOURce:FUNCtion[:SHAPe]:CONDition . . . . . . . . . . . . . . . . . . . . . . . . . . 331

SOURce:FUNCtion[:SHAPe]:PULSe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

SOURce:FUNCtion[:SHAPe]:SQUare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

SOURce:PULM[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

SOURce:PULM:STATe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333

SOURce:PULSe:PERiod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333

SOURce:PULSe:PERiod? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334

SOURce:PULSe:WIDTh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334

SOURce:PULSe:WIDTh? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335

SOURce:VOLTage[:AMPLitude] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335

STATus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

The Operation Status Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

STATus:OPERation:CONDition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

STATus:OPERation:ENABle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340

STATus:OPERation:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

STATus:OPERation[:EVENt]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

STATus:OPERation:NTRansition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

STATus:OPERation:NTRansition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342

STATus:OPERation:PTRansition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342

STATus:OPERation:PTRansition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343

STATus:PRESet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344

The Questionable Data Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344

STATus:QUEStionable:CONDition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344

STATus:QUEStionable:ENABle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345

STATus:QUEStionable:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346

STATus:QUEStionable[:EVENt]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346

STATus:QUEStionable:NTRansition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346

STATus:QUEStionable:NTRansition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

STATus:QUEStionable:PTRansition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

STATus:QUEStionable:PTRansition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348

Contents 17

SYSTem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349

SYSTem:CTYPe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349

SYSTem:ERRor? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349

SYSTem:VERSion? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350

TRIGger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351

TRIGger:COUNt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353

TRIGger:COUNt? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353

TRIGger[:IMMediate] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

TRIGger:SOURce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

TRIGger:SOURce? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355

TRIGger:TIMer[:PERiod] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355

TRIGger:TIMer[:PERiod]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356

IEEE-488.2 Common Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357

*CAL? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357

*CLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

*DMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

*EMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

*EMC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

*ESE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359

*ESE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359

*ESR? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359

*GMC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359

*IDN? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359

*LMC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360

*OPC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360

*OPC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360

*PMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361

*RMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361

*RST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361

*SRE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362

*SRE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362

*STB? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362

*TRG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363

*TST? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363

*WAI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366

18 Contents

Command Quick Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367

Appendix A

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

HP E1422 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

HP E1529A Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404

Appendix B

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407

Appendix C

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417

Appendix D

Wiring and Noise Reduction Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421

Separating Digital and Analog SCP Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421

Recommended Wiring and Noise Reduction Techniques . . . . . . . . . . . . . . . . . 422

Wiring Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422

HP E1422 Guard Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423

Common Mode Voltage Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423

When to Make Shield Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423

Noise Due to Inadequate Card Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423

HP E1422 Noise Rejection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424

Normal Mode Noise (Enm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424

Common Mode Noise (Ecm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424

Keeping Common Mode Noise out of the Amplifier . . . . . . . . . . . . . . . . . . 424

Appendix E

Generating User Defined Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425

Haversine Example.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426

Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 428

Appendix F

Example PID Algorithm Listings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429

PIDA Algorithm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429

PIDB Algorithm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431

PIDC Algorithm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445

Contents 19

20 Contents

About this Chapter

This chapter will expl ain hardware configuration before installation in a VXIbus mainframe. By attending to each of the se configuration it ems, your HP E1422 won’t have to be removed from its mainframe later. Chapter contents include:

• Configuring the HP E1422 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

• Instrument Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

• About Example Programs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

• Verifying a Successful Configuration. . . . . . . . . . . . . . . . . . . . . . . 30

Configuring the HP E1422

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

Chapter 1

Getting Started

• Setting the Logical Address Switch . . . . . . . . . . . . . . . . . . . . . . . . 22

• Installing Signal Conditioning Plug-ons. . . . . . . . . . . . . . . . . . . . . 23

• Disabling the Input Protect Feature (optional) . . . . . . . . . . . . . . . . 27

• Disabling Flash Memory Access (optional) . . . . . . . . . . . . . . . . . . 27

For most applications you will only need to change the Logical Address switch 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 HP E1422 uses a default VXIbus

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

Getting Started 21Chapter 1

Setting the Logical

Address Switch

Follow the next figure and ignore any switch numbering printed on the Logical Address switch. W hen installing more than one HP E1422 in a single VXIbus Mainframe, set each instrument to a different Logical Address.

Setting the Logical Address Switch

22 Getting Started Chapter 1

Installing Signal

Conditioning

The following illustrations show the steps you’ll use to install Signal Conditioning Modules. Before you install your SCPs, you should read the "Separating Digital and Analog SCP Signals" in Appendix D page 421.

Plug-ons

Caution Use approved Static Discharge Safe handling procedures

anytime you have the covers removed from the HP E1422 or are handling SCPs.

Installing SCPs: Step 1, Removing the Cover HP E1422

Remove the SCP

Retaining Screws

Remove 2 screws ( #10 Torx);

lift front and sli de out tabs

E1520 REMVLEFT

Getting Started 23Chapter 1

Installing SCPs: Step 2, Mounting an SCP

CAUTION

Use approved Static

Discharge handling

procedures when handling

the HP E1413 Scanning

A/D Module and the SCP s.

E1520 INSLSCP

Align the SCP Connectors with the Module Connec to rs

and then Push in

SCP

Tighten the SCP

Retaining Screws

24 Getting Started Chapter 1

Installing SCPs: Step 3, Reinstalling the Cover HP E1422

Line up the 3 Tabs

with the 3 Slots;

then lower cov er

onto the Modul e

E1520 INSTLEFT

Tighten

2Screws

Getting Started 25Chapter 1

Installing SCPs: Step 4, Labeling

Peel off c orrec t

Label from Card and

Stick on the

appropriate place on

the Co ver

Term in al Module

(Connect to A/D

Module L ater)

Stick-onLabel furnished with the SCP

(HP part number: E15xx-84304)

Peel off Lab el from

Card and Stick on

the Terminal

Module to be

Connected to the

A/D Module

26 Getting Started Chapter 1

Disabling the

Input Protect

Feature

(optional)

Disabling the Input Protect feature voids the HP E1422’s warranty. The Input Protect feature allows the HP E1422 to open all channel input relays if any input’s voltage exceeds ±19 volts (±6 volts for digital I/O SCPs). This fe ature will help to protect the card’s Signal Conditioning Plug-ons, input multiplexer, ranging amplifier, and A/D from destructive voltage le vels. The le vel 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 your

application the importance of completing a measurement run outweighs the added risk of damage to your HP E1422, you may choose to disable the Input Protect feature.

Voids Waranty! Disabling the Input Protection Feature voids the HP E1422’s warranty.

To disable the Input Prote ction feature, locat e and cut JM2202. Make a singl e cut in the jumper and bend the adjace nt ends ap art. Se e foll owing i llust ration for locat ion of JM2202.

Disabling

Flash Memory

Access

(optional)

The Flash Memory Protect Jumper (JM2201) is shipped in the “PROG” position. We recommend that you leave the jumper in this position so that all of the calibration commands can function. Changing the jumper to the protect position will mean you won't be able to execute:

•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” po sition, you ca n completely ca librate one or mor e HP E1422s without removing them from the application system. An HP E1422 calibrated in its working environment will in general be better calibrated than if it were calibrated separate from its application system.

The multimeter you use dur ing the per i odi c ca li bra ti on c ycl e should be considered your calibration transfer standard. Have your Calibration Organization control unauthorized access to its calib ration cons tants. See the HP E1422 Service Manual for complete information on HP E1422 periodic calibration.

If you must limit access to the HP E1422's calibration constants, you can place JM2201 in the protected position and cover the shield retaining screws with calibration stickers. See following illustration for location of JM2201.

Getting Started 27Chapter 1

Accessing and Locating JM2201 and JM2202 HP E1422

Flash MemoryProtect Jumper

Default = PROG (recommended)

JM2201

E1413 FIG1-3

JM2202

1 Locate

2Cut

3 Bend

Input Protect Jump er

Warning: Cutting this Jumpe r

Voids Your Warranty!

28 Getting Started Chapter 1

Installing the Module

Installation of the HP E1422 VXI module is covered in your HP Mainframe manual.

WARNING All instruments within the VXI mainframe are gr ounded thro ugh

the mainframe chassis. During insta llation, 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 HP Universal Drivers CD that comes with your Instrument. There is a VXIpl ug&pl ay driver which includes a front panel program and help file. In addition there is also a down-loadable driver for the HP E1406A Command Module. Follow the instructions that are presented by the CD setup program. Also view the readme .txt file pro vided wit h the VXIplug&pl ay 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

HP Universal Drivers CD supplied with your HP E1422. Again see the readme.txt file for the specific file locations of these examples.

Example

Command

Sequences

Typical Example

program

Where programming concept s ar e discussed in this manual, the commands to send to the HP E1422 are shown in the form of command sequences. These are not example programs because t hey are not written in a ny computer language. Th ey are meant to show the HP E1422 SCPI commands in th e sequ ence the y shoul d be se nt. Where necessary th ese sequences include comments to describ e program flow and

control such as loop - end loop, and if - end if. See “Example SCPI Command Sequence” on page 134. for an example. For VXIplug&play users, there is an “Example VXIplug&play Driver Function Sequence” on page 135.

The Verify program (file name ve rif.cpp) is printed below to show a typical VXIplug&play program for the HP E1422.

Getting Started 29Chapter 1

Verifying a Successful Configuration

An example ’C’ progra m source is s hown on th e fol lowing p ages. T his pr ogram is included on your HP Universal Drivers CD that comes with your HP E1422A (file name verif.cpp). The program uses the *IDN? query command to verify the HP E1422 is operational and r esponding t o commands. The program also has an error checking function ( check( )). It is important to include an instrument error checking routine in your programs, particularly your first trial programs so you get instant feedback while you are learning about the HP E1422. Compile this program according to the plug&play help file (hpe1422.hlp) topics "Introduction to Programming" 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.

This program should be compiled in the ’large’ memory model.

→"Compiling and Linking Programs Using Integrated

link with the hpe1422_32.lib - library file *******************************************************************************

*/ #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];

/* Set the session and status variables */ #if defined(__BORLANDC__) && !defined(__WIN32__) _InitEasyWin(); #endif

30 Getting Started Chapter 1

/* 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); 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); }

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

Getting Started 31Chapter 1

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

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; }

32 Getting Started Chapter 1

About This Chapter

This chapter shows how to pla n and connect fiel d wiring to the HP E1422’s Terminal Module. The ch apter expl ains proper connection of analog signals to the HP E1422, both two-wire voltage type and four-wire resistance type measurements. Connections for ot her measu rement t ypes (e .g., str ain usi ng the Bridge Completion SCPs) refer to the specific SCP ma nual. Chapter contents include:

Chapter 2

Field Wiring

• Planning Your Wiring Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

• Faceplate Connector Pin-Signal Lists. . . . . . . . . . . . . . . . . . . . . . . 37

• Optional Terminal and Connector Modules . . . . . . . . . . . . . . . . . . 38

• Reference Temperature Sensing with the HP E1422 . . . . . . . . . . . 42

• Preferre d Measurement Connections . . . . . . . . . . . . . . . . . . . . . . . 44

• Connecting the On-board Thermistor. . . . . . . . . . . . . . . . . . . . . . . 47

• Wiring and Attaching the Terminal Module . . . . . . . . . . . . . . . . . . 48

• Removing the HP E1422 Terminal Modules . . . . . . . . . . . . . . . . . 50

• Adding Components to the Terminal Module. . . . . . . . . . . . . . . . . 52

• Spring and Screw Terminal Module Wiring Maps . . . . . . . . . . . . . 53

Planning Your Wiring Layout

The first point to understand is that the HP E1422 makes no assumptions about the relations hip between S ignal Conditioni ng Plug-on (SCP) f unction and the position in the HPE1422 that it can occupy. You can put any type of SCP into any SCP position. There are, however, some fac tors you should consider when planning what mix of SCPs should be installed in e ach of your HP E1422s. The following discussions will help you understand these factors.

SCP Positions and

Channel Numbers

The HP E1422 has a fixed r elationship between Signa l Conditioning Plug-on positions and the channels the y connect to. Each of the eig ht SCP positi ons can connect to eight channe ls. Figure 2-1 sh ows the channel number to SCP relationship.

Field Wiring 33Chapter 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

34 Field Wiring Chapter 2

Sense SCPs and

Output SCPs

Some SCPs provide input signal conditionin g (sense SCPs such as filters and amplifiers) while others provide stimulus to your measurement circuit (output SCPs such as curr ent sources and strain bridge completion). In general, channels at output SCP positions are not used for external signal sensing but are paired wit h channels of a sense SCP. Two points to r emember about mixing output and sense SCPs:

1. Paired SCPs (an output and a sense SCP) may reside in separate HP E1422s. SCP outputs are adjusted by *CAL? to be within a specific limit. The Engineeri ng Unit (EU) conversio n used for a sense channel will assum e the calibrated value for the output channel.

2. Output SCPs while providing st imulus to your measurement circuit reduce the number of external sense channels available to your HP E1422.

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

Figure 2-2. Pairing Output and Sense SCP Channels

Field Wiring 35Chapter 2

Planning for

Thermocouple

Measurements

Note The isothermal reference temperature measurement made by an HP E1422

Note To make good low-noise measurements you must us e shielded wiring from

Using either the Screw Ter minal or Sprin g Terminal Modules y ou can wir e your thermocouples and your ther mocouple refe rence temper ature sens or to any of the HP E1422’s channels. When you execute your scan list, you only have to make sure that the reference temper ature sensor is specified in the channel sequence before any of the associated thermocouple channels.

External wiring and connect ions to the HP E1422 are made using Ter minal Modules (see Figures 2-4 through 2-6).

applies only to thermocouple measurements made by that instrument. In systems with multiple HP E1422s, each instrument must make its own reference measurements. The reference measurement made by one HP E1422 can not be used to compensate thermocouple measurements made by another HP E1422.

the device under test to the Terminal Module at the HP E1422. 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 421.

36 Field Wiring Chapter 2

Faceplate Connector Pin-Signal Lists

Figure 2-3 shows the Fac eplate Connector Pi n Signal List for t he HP E1422.

Figure 2-3. HP E1422A Faceplate Connector Pin Signals

Field Wiring 37Chapter 2

Optional Terminal and Connector Modules

The HP E1422 is comprised of the main A/D module and optionally, a Connector or Terminal Modul e. The Option 001 Connector Module provides 16 RJ-45 jacks to allow easy connect ion of the HP E1422A to Remote Signal Conditioning Units (RSCUs) li ke the HP E1529A 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 HP Remote Signal

Conditioning Units (RSCUs).

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 plu gged int o the Connec tor Mo dule.

•Note: Since the RJ-45 Con nector Modul e was des igned for connect ion

to RSCUs, it doesn’t provide an on-board isothermal reference thermistor or conne cti on to the HP E1422A’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 la bels to map that SCP's cha nnels to the Terminal Module's terminal blocks. See “Installing SCPs: Step 4, Labeling” on page 26.

Figures 2-4 through 2 -6 show the layout and feature locat ion of the Terminal Modules available for the HP E1422A.

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 30VACRMS or 60VDC.

38 Field Wiring Chapter 2

The RJ-45

Connector Module

RJ-45 Connector Module Pinout

for Std SCP I/O (even chs 0,2,4,6)

Ch0

Shield Gnd

RJ-45 Connector Module Pinout

for Std SCP I/O (odd chs 1,3,5,7)

Ch1

Shield Gnd

Ch2

12345678

Ch3

12345678

Ch4

Ch5

Ch2

Ch6

Shield Gnd

Ch3

Ch7

Shield Gnd

Figure 2-4 shows the HP E1422A Option 001 RJ-45 Connector Module with connector pin numbering.

+=Hi

-=Lo

+=Hi

-=Lo

R elease

ead M

anual for R

elease Instructions

elease

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 HP E1422A 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 5mm strip back of insulation to prevent the possibility of shorting to other wiring on adjacent terminals.

Field Wiring 39Chapter 2

Sockets for Guard to Ground Connections

Termi nal Block f or

Input Connections

Jumper to select for

On-board or Remote

Temperat ure Sensing

On-board Thermisto r

for Temperat ure Sensi n

Terminal Bloc k with Remote Tem perature S ensing , Trigger, and other Connections

Figure 2-5. HP E1422A Spring Terminal Module

40 Field Wiring Chapter 2

Screw Terminal

Module Layout

Figure 2-6 shows the HP E1422A Option 011 Screw Terminal Module features and jumper locations.

Figure 2-6. HP E1422A Screw Terminal Module

Field Wiring 41Chapter 2

Reference Temperature Sensing with the HP E1422

The Screw Terminal and Spring Terminal Modules provides an on -board thermistor for sensing isother mal ref erence temper ature of the t erm inal b locks. Also prov ided is a jumper set (J1 in Figures 2-7 and 2-8) to route the HP E1422’s on-board current source to a thermistor or RTD on a remote isothermal reference block. Figure 2-7 and Figure 2-8 show connect ions for both local and remote sensing. See “Connect ing

the On-board Thermistor” on page 47. for location of J1.

E1415 Terminal Module Field Wiring

HTI

LTI

HTS

LTS

Hnn

Lnn

On-Board Current Source

REM

Any Sense

Channel

BOARD

Figure 2-7. On-Board Thermistor Connection

E1415 Terminal Module Field Wiring

HTI

LTI

REM

BOARD

On-Board Current Source

Any Sense

Channel

HTS

LTS

Hnn

Lnn

Figure 2-8. Remote Thermistor or RTD Connections

42 Field Wiring Chapter 2

Terminal Module

Considerations for

TC Measurements

The isothermal characteristics of the HP E1422 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 HP E1422 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 te mper ature gradient betwe en the HP E1422 module and the Terminal Module.

4. The VXI mainframe cooling fan fil ters 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 HP E1422 at a uniform temperature. If there is no front door, try opening the back door.

6. HP recommends that the cooling fan switch on the back of the of an HP E1401 Mainframe is in the "High" position. The normal variable speed cooling fan control can make the internal HP E1422 module temperature cycle up and down, which affects the amplifiers with these uV level signals.

Field Wiring 43Chapter 2

Preferred Measurement Connections

IMPORTANT!

For any A/D Module t o scan channels a t high speeds, it must use a very short sample period (<10µsecond for the HP E1422). If significant normal mode noise is

presented to its inputs, that noise will be part of the measurement. To make quiet, accurate measurements in ele ct ri cal ly nois y environments, use properly connected shielded wiring between the A/D and the device under test. Figure 2-9 shows recommended connecti ons for p owered tr ansducers , thermocou ples, and resis tance transducers. (See Appendix D page 421 for more information on Wiring Techniques).

Notes 1. Try to install A nalog SCPs r elative to Digital I/O as shown in "S eparating

Digital and Analog Signals" in Appendix .

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 Fi gure 2-10 for schematic of Guard to Ground circuitry on the Terminal Module).

4. The Terminal Module is shipped with the Ground-Guard (GND-GRD) shorting jumper installed for each channel. These may be left inst alled or removed (see Figure 2-1 1 t o remove the jumpe r), depende nt on the fol lowing conditions:

a. Grounded Transducer with shield connected to ground at the

transducer: Low frequency ground loops (DC and/or 50/60Hz) 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).

b. Floating Transducer with shield connected to the transducer at the

source: In this case, the best performance will mos t like ly be ac hieved by leaving the GND-GRD jumper in place (Figure 2-9 B/D).

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

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

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

6. In general, don’t connect Hi or Lo to Guard or Ground at the HP E1422.

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

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

9. Since each system is different, don’t be afraid to experiment using the suggestions presented here until you find an acceptable noise level.

44 Field Wiring Chapter 2

Device

Under Test

Device

Under Test

pressure

P V

power

ShieldShield

Example for Powered Transducers

Shield

Hi Lo

Guard

RemoveJumperto break Ground Loop (shield connected to ground at transducer)

Guard

Leave Jumper in Place (transducer floating)

Device

Under Test

Device

Under Test

Shield

Example for Thermocouples

Shield

Example for Resistive Transducers

Guard

RemoveJumperto break Ground Loop (shield connected to ground at transducer)

Leave Jumper in Place (transducer floating)

Jumper may be left in place, since CurrentLo( + ) is at E1415 GND Potential

Current Hi ( - ) Current Lo ( + )

Figure 2-9. Preferred Signal Connections

Field Wiring 45Chapter 2

External Connections

TerminalModule

1KΩ

For each

SCP Position

.1 µF

GND to GRD Jumper (removable)

1KΩ

GND to GRD Jumper (removable)

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

Removing Guard to

Ground on Channel 00

10 KΩ

Figure 2-11. Grounding the Guard Terminals

46 Field Wiring Chapter 2

Connecting the On-board Thermistor

The following figures show how to use the HP E1422 to make temperature measurements using the on-board Thermi stor 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 HP E1422A’s Spring Terminal Module, Figure 2-6 shows the configuration for the Screw Terminal Module. See “Reference Tempe rature Sens ing with the HPE1422” on page 42. for a schematic diagram of the reference connections.

UnderCover

Place both J1 jumpers here to connect current source to on-board thermistor RT1. Sense RT1 by connecting any sense channels to terminals HTS and LTS.

Place both J1 jumpers here to route current source to terminals HTI a nd LTI. Connec t these terminals to remote thermistor or RTD. Sense with any sense channel.

ON BOARD

REMote

See Figure 2-13 on page 48 to remove the cover

Figure 2-12. Temperature Sensing for the Terminal Module

Field Wiring 47Chapter 2

Wiring and Attaching the Terminal Module

Figures 2-13 and 2-14 show how to open, wire, and attach the terminal module to an HP E1422.

Remove Clear Cover.

A. Release screws. B. Press tab forward

and release.

Tab

Make Connec tions (Spring Clamp)

Depress terminal lever(s). Insert

wire(s) into terminal(s). Re lease levers.

Use wire size 20-26 AWG

5mm

0.2"

Special tool HP P/N 8710-2127

(Shipped with Terminal Module)

Remove and Retain Wi rin g Exi t Pan el

(Screw Type)

Remove 1 of the 3

wire exit panels.

Use wire

size 16-26

AWG

5mm

0.2"

VW1 Flammability

Rating

Insert wire into terminal. Tighten screw.

Route Wiring4

Tighten wraps to

secure wires.

Figure 2-13. Opening and Wiring the E1422’s Terminal Module

48 Field Wiring Chapter 2

Figure 2-14. Closing and Attaching the HP E1422 Terminal Module

Field Wiring 49Chapter 2

Removing the HP E1422 Terminal Modules

Figure 2-15 shows how to remov e the Spring Terminal and Screw Terminal Modules from the HP E1422A.

Release the two extr ac tio n

levers and push bo th levers out simultane ous ly

Extraction L ever

Use a small screwdriver

to pry and release the

two extraction levers

Free and remove th e Terminal

Module from the A/D Module

Extraction Lever

HP E1415

Extraction L ever

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

50 Field Wiring Chapter 2

Attaching and Removing the HP E1422 RJ-45 Module

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

Install on HP E1422A

Push in the Extraction Levers to Lock the Terminal Module onto the HP E1422A

Extraction

Levers

Releasing the Extraction Levers to Remove the Termi nal Module

Screwdriver

With 1/8"

Blade

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

Field Wiring 51Chapter 2

Adding Components to the Terminal Module

The back of the terminal module P.C. board provid es surface mount pads which y ou can use 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 teminal module P.C. board). Figu re 2-18 shows some usage example schematics.

Figure 2-17. Additional Component Location

Figure 2-18. Series & Parallel Component Examples

52 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 GND 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 b lock

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 53Chapter 2

Figure 2-20 shows the Screw Terminal Module wiring map

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

54 Field Wiring Chapter 2

Chapter 3

Programming the HP E1422A & HP E1529A

for Remote Strain Measurement

About This Chapter

This chapter describes using the HP E1422A in combination with the HP E1539A Remote Channel SCP and HP E1529A Remote Strain Conditioning Units to make large channel count strain measuremen ts. We show the system used in a strictly data acquisition mode where after configuration it is driven by a channel list you define (the Scan List), and

sends the measurements to the unit’s FIFO buffer and Current Value Table (CVT) for transfer to your computer. Of course you can also create control algorithms that execute concurrently with the Scan List driven data acquisition operation. Chapter 4 and Chapter 5 cover general data acquisition and contr ol programming with algo rithms. This chapter a ssumes that you are the expert when it comes to making strain measurements so we’re simply going to show you how to make your strain measureme nts with the HP Remote Strain Measuring System (HP E1422A, HP E1539As, and HP E1529As). The chapter will cover:

• Instrument Setup for Remote Strain Measurements. . . . . . . . . . . . 56

-- Preparing the HP E1422A for Installation . . . . . . . . . . . . . . . . . 56

-- Installing User Selected 1/4 Bridge Resistors (optional) . . . . . . 57

-- Connecting HP E1529As to the HP E1422A . . . . . . . . . . . . . . . 60

-- Connecting Excitation Supplies . . . . . . . . . . . . . . . . . . . . . . . . . 65

• Connecting the HP E1529A to Strain Gages . . . . . . . . . . . . . . . . . 66

-- Channel Connector Pin-to-Signal Relationship . . . . . . . . . . . . . 66

-- HP E1529A Bridge Configurations . . . . . . . . . . . . . . . . . . . . . . 67

• Connecting to the HP E1529A’s Dynamic Strain Ports . . . . . . . . . 70

-- Dynamic Strain Port Offset Control . . . . . . . . . . . . . . . . . . . . . . 72

• Remote Strain Channel Addressing . . . . . . . . . . . . . . . . . . . . . . . . 73

-- Runtime Remote Scan Verification. . . . . . . . . . . . . . . . . . . . . . . 73

• Programming for Remote Strain Measurement . . . . . . . . . . . . . . . 75

-- Description of Strain Measurement . . . . . . . . . . . . . . . . . . . . . . 75

Measure Strain Using Built-in Strain EU Conversion . . . . . . 76

Measure Strain Using User Specified EU Conversion . . . . . . 80

Measure Bridge Voltages and Convert to Strain. . . . . . . . . . . 83

• Verifying Correct Bridge Completion (Shunt Cal). . . . . . . . . . . . . 87

• Built-in Strain Conversion Equations. . . . . . . . . . . . . . . . . . . . . . . 89

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 55Chapter 3

Instrument Setup for Remote Strain Measurements

This section involves:

•Preparing the HP E1422A for installation into a VXIbus Mainframe

•Preparing the HP E1429A for use

•Connecting the HP E1422A to HP E1529A Remote Stra in Completion

units.

•Connecting Excitation power supplies to the HP E1529A

•Connecting strain bridges to the HP E1529A

Preparing the

HP E1422A for

Installation

Overview Before we get into the s pecifics of co nfiguring a Re mote Strain Measuring

Each HP E1422A With HP E1539A SCPs

And HP E1529A Remote Strain Units

Can Support Up-To 512 Strain Gages

HP E1539A

SCP (Up-To 8)

The HP E1422A needs HP E1539A SCPs to control Remote Signal Conditioning Units like the HP E1529A Remote Strain Conditioning Unit.

Chapter 1 “Getting Started” covers everything you need to do before you install your HP E1422A in its Mai nframe. Thi s include s switch settings and SCP installation. After performing the operations in Chapter 1, return here for Remote Strain specific op erations.

System, it might help you to see what we are going to set-up. Figure 3-1 shows the components and c onnections of a remote strain measuring system. The circled letters identify connections that will be referred to in later sections.

Up-to 4 Excitation Supplies

HP E1529A

1529A E

p-to 16 H U

HP E1529A

HP E1422A Multif unction DAC Module Shown With

An Option 001 RJ-45

Connector Module

Up-to 32 Strain

Gages

Up-to 4 Excitation Supplies

Up-to 32 Strain

Gages

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

56 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Preparing the

HP E1529A for Use

WARNING Ground the equipment: The Safety earth ground for the

WARNING The power cord is the only way to disconnect the HP E1529A

For most applications, the HP E1529A is ready for installation as delivered. It is designed to be easily rack mounted in a system cabinet by its built-in front panel extensio ns. All user connecti on are acce ssible on th e front p anel with the exception o f the li ne-cord j ack whi ch is on the re ar of the un it. The only pre-installat ion opera ti on you migh t need to consider is installa ti on of user supplied quarter -bridge completion resistors. If your application

requires these, s ee “Installing Use r Selected 1/4 Bridge Resistors ( optional)” in the following section.

HP E1529A is supplied through the ground conductor of the

power cable. Make sure your installation’s AC line supply connectors provide a suita ble earth ground.

from AC power. Therefore, the power cord must be accessible to the operator at all times. When the HP E1529A 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 (opt ional)

Perform this operatio n only if you require o ne or more HP E1529A channels to provide 1/4 Bridge completion of other than 120 with experience solder ing components on printed circuit boards should attempt this installation. The HP E1529A provides locations on its printed circuit board to install your own 1/4 bridge completion resistors. Bridge configuration commands then can switch your resistors into the bridge

completion circuits where you’ve installed custom value resistors.

Ω or 350Ω . Only those

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 you ar e qualified to do so.

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

specified resisto rs will be instal led. Notice that both a surface-mount as well as a through-hole position is provided for each channel.

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 57Chapter 3

Tab

Unlatch Cover from Bottom Cover Tab on Each Side

Detail "A"

Figure 3-2. Removing the HP E1529A Top Cover

Loosen

Top Cover

Screw

Remove Top Cover

PC Board

See Detail "A"

58 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Locating Resistors Figure 3-3 provides the relationship b etween P.C. board loc ation and bridg e

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

"Rxx" Indicates the

Channel Number

Through-Hole

-U 01-U

OROR

Resistor Positions

00-U

01-U

S 3-U

02-U

16-U

17-U

25-U

24-U

20-U

21-U

29-U

28-U

Surface-Mount

04-U

05-U

S 7-U

06-U

Resistor Positions

09-U

08-U

P401

P402

403 P

13-U

12-U

S 1-U

10-U

S 5-U

14-U

19-U

18-U

23-U

22-U

26-U

27-U

30-U

31-U

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

Installing Resistors Figure 3-4 shows a typical us er selected 1/4 bri dge resistor instal lation. Note

that resistor inst allations can be accomplished from the top of the board without further disas sembly. If you are inst alling through-hol e resistors, you must be very careful to observe the specifie d maximum safe resistor lead length to avoid shorti ng the resistor to the chassis.

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 59Chapter 3

0.1"

2.54mm

PC Board

Chassis

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

Connecting

HP E1529As to the

HP E1422A

The cable between an HP E1422A and each HP E1529A (connection "A" i n Figure 3-1) is a standard type of cable used in computer Local Area Networks (LANs). The HP E1529A can be any distance up-to 1000 feet from the HP E1422A, and the interconnec t cable can be ea sily custom mad e to fit the ins tallation. In fact, if your firm has an Information Technolog y department, they may already be making or having made this same type of cable assembly.

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 HP E1422A will be able to make accurate measurements from an HP E1529 A over the maximum cable length of 1000 feet (305 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) 1586A Non-Plenum Type: (PVC Jacket and polyolefin insulation) 1584A

Tables 3-1 and 3-2 show part numbers for supplies that will allow you to quickly custom make high qua li ty cables for your installation. If you op t t o have a third party build your cables, make certain they supply you with cables that comply with the TIA/EIA-568 Category 5 standard and 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 st andards for wiring (f lammabil ity etc.) may apply t o your installation and you should check applicable codes and standards in your area and select the proper type of cable accordingly (plenum vs. non-plenum types etc.).

Table 3-1.

Cable Part Numbers for Belden Wire & Cable Company

‡DuPont trademark

Table 3-2.

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) 5-569550-4 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

60 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

569875-X

Two Interconnect

Methods

Depending on which Termina l Module you or dered with yo ur HP E1422A, there are two methods of interc onnecting an HP E1529A to the HP E1422A (connection "A" in Figure 3-1).

The Option 001 RJ-45

Connector Module

HP E1422A Option 001

The RJ-45 Connector Module is used when mos t or all of HP E1422A SCP positions contain an HP E1539A Remote Channel SCP. For RSCUs, you

just plug one end int o t he HP E1422A, and the other into the HP E1529A’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 39 for on-board SCP chann el connect ion throu gh the RJ-45 connector module.

HP E1529A

Length up-to 1000 feet

ShieldShield

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

1 2 3 4 5 6 7 8

Figure 3-5. Connecting HP E1529As to the RJ-45 Connector Module

TIA/EIA 568A Wiring Diagram

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 61Chapter 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

SCP Position 3 Addresses 12400 to 12531

1 Analog+ (wht-green) HI 00 HI 01 2 Analog- (green) LO 00 LO 01 3 Cal+ (wht-orange) HI 02 HI 03 4 RS-485+ (blue) HI 04 HI 05 5 RS-485- (wht-blue) LO 0 4 LO 05 6 Cal- (orange) LO 02 LO 03 7 Trigger+ (wht-brown) HI 06 HI 07 8 Trigger- (brown) LO 06 LO 07 1 Analog+ (wht-green) HI 08 HI 09 2 Analog- (green) LO 08 LO 09 3 Cal+ (wht-orange) HI 10 HI 11 4 RS-485+ (blue) HI 12 HI 13 5 RS-485- (wht-blue) LO 1 2 LO 13 6 Cal- (orange) LO 10 LO 11 7 Trigger+ (wht-brown) HI 14 HI 15 8 Trigger- (brown) LO 14 LO 16 1 Analog+ (wht-green) HI 16 HI 17 2 Analog- (green) LO 16 LO 17 3 Cal+ (wht-orange) HI 18 HI 19 4 RS-485+ (blue) HI 20 HI 21 5 RS-485- (wht-blue) LO 2 0 LO 21 6 Cal- (orange) LO 18 LO 19 7 Trigger+ (wht-brown) HI 22 HI 23 8 Trigger- (brown) LO 22 LO 23 1 Analog+ (wht-green) HI 24 HI 25 2 Analog- (green) LO 24 LO 25 3 Cal+ (wht-orange) HI 26 HI 27 4 RS-485+ (blue) HI 28 HI 29 5 RS-485- (wht-blue) LO 2 8 LO 29 6 Cal- (orange) LO 26 LO 27 7 Trigger+ (wht-brown) HI 30 HI 31 8 Trigger- (brown) LO 30 LO 31

For mixed on-board SCP channels and RSCU operation, you can use the spring type, or screw type terminal modules. For standard SCP channel

connections see Chapt er 2 “Fi el d Wir in g ” on p age 33. For remote channels you connect the individual wires from each HP E1529A’s data interface cable to the ap propriate terminals for remote channel operation. The HP E1539A SCP is supplied with signal locator labels fo r 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 HP E1439A signal name and associated terminal name as printed on the Terminal Module.

Table 3-3.

SCP Signal Names - to - Terminal Names

HP E1539A Signal Name

(with EIA/TIA-568A

wire color-code)

Ter minal Name on

Terminal Module

(SCP’s low channel)

Terminal Name on

Terminal Module

(SCP’s High Channel)

62 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

SCP Position Plug

Pin#

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 32 HI 33 2 Analog- (green) LO 32 LO 33 3 Cal+ (wht-orange) HI 34 HI 35 4 RS-485+ (blue) HI 36 HI 37 5 RS-485- (wht-blue) LO 3 6 LO 37 6 Cal- (orange) LO 34 LO 35 7 Trigger+ (wht-brown) HI 38 HI 39 8 Trigger- (brown) LO 38 LO 39 1 Analog+ (wht-green) HI 40 HI 41 2 Analog- (green) LO 40 LO 41 3 Cal+ (wht-orange) HI 42 HI 43 4 RS-485+ (blue) HI 44 HI 45 5 RS-485- (wht-blue) LO 4 4 LO 45 6 Cal- (orange) LO 42 LO 43 7 Trigger+ (wht-brown) HI 46 HI 47 8 Trigger- (brown) LO 46 LO 47 1 Analog+ (wht-green) HI 48 HI 49 2 Analog- (green) LO 48 LO 49 3 Cal+ (wht-orange) HI 50 HI 51 4 RS-485+ (blue) HI 52 HI 53 5 RS-485- (wht-blue) LO 5 2 LO 53 6 Cal- (orange) LO 50 LO 51 7 Trigger+ (wht-brown) HI 54 HI 55 8 Trigger- (brown) LO 54 LO 55 1 Analog+ (wht-green) HI 56 HI 57 2 Analog- (green) LO 56 LO 57 3 Cal+ (wht-orange) HI 58 HI 59 4 RS-485+ (blue) HI 60 HI 61 5 RS-485- (wht-blue) LO 6 0 LO 61 6 Cal- (orange) LO 58 LO 59 7 Trigger+ (wht-brown) HI 62 HI 63 8 Trigger- (brown) LO 62 LO 63

Table 3-3.

SCP Signal Names - to - Terminal Names

HP E1539A Signal Name

(with EIA/TIA-568A

wire color-code)

Ter minal Name on

Terminal Module

(SCP’s low channel)

Terminal Name on

Terminal Module

(SCP’s High Channel)

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 63Chapter 3

Example Terminal

Module to HP E1529A

Connection

Figure 3-6 shows a typi cal c onnect ion to an HP E1529A through one of the optional terminal modules . In this case, the con nection is to the l ow channel on the HP E1539A in SCP position number 6 (chan nels 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.

in 2 P

rom F

in 1 P

m ro

in 6 P

rom F

in 3 P

rom F

in 5 P

rom F

in 4 P

rom F

in 7

rom

rom F

wht-grn

green

wht-org

blue

wht-blu

orange

wht-brn

brown

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

SCP Pos. * 8 + wht-grn

green wht-org orange blue wht-blu wht-brn brown

1Hi

1 3

Hi Lo

Hi5 Lo

5 7Hi

Figure 3-6. Connecting an HP E1529A to an Optional Terminal Module

64 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Connecting

Excitation Supplies

Notes 1. The maximum excitation voltage the HP E1422A can sense through

This connection is shown as "B" in Figure 3-1. The HP E1529A uses external excitatio n suppl i es. The re ar e fo ur pa ir s of in put pins (and Gnd) at the "Bridge Excitation" connector for up-to four individual excitation supplies. Each of these four inputs powers eight channels through a programmable switch. You can of course parallel-wire multiple excitation inputs to a single power supply.

the HP E1529A’s excitation sense path is 16 volts (

±8VDC centered

about the Gnd terminal). If you supply higher excitation voltage through the HP E1529A, don’t con n ec t t he exc it at ion se nse te rmin al s.

2. Make sure that the power supply you choose can supply the current requirement o f all of the bridges it can be sw itched to. It wi ll be connected to all bridges you are going to measure before a measurement scan is star ted. The supply switches can not be programmatically re-configured while a measurement scan is under way. You must halt a measurement scan to programmatically re-configure the excitation supply switches.

Power

Supply 1

Power

Supply 4

Power Supplies

and Cabling

Inside

HP E1529A

Chs 0-7

-P

Chs 24-31

Gnd

Ch 0-7

+ -

Ch 8-15

+ -

+ - + -

Ch 16-23 Ch 24-31

Figure 3-7. Excitation Supply Connections

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 65Chapter 3

Connecting the HP E1529A to Strain Gages

The following discuss ion relates t o the connection marked "C" in Fig ure 3-1

on page 56. We’ll show you how to connect your strain gages to the RJ-45 telecom connectors. 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 an example gage connection.

RJ-45 Modular Connector (Shielded)

(Example Half-Bri dge Connection)

8-Conductor Twisted-Pair, Overall-Shielded

(Probably Stranded for Flexability)

Figure 3-8. HP E1422 to Strain Gage Connection

Channel Connector

Pin-to-Signal

Relationship

Figure 3-9 shows the pin-to-signal relationship for each HP E1529 strain gage connector. You will find these same signal names on the following strain bridge configuration illustrations too.

Pinout for Upper Connector Row

Shield Gnd

Excitation Sense

Sense

Excitation

Shield Gnd

R Cal

321 45678

Shield Gnd

Excitation

Sense

SenseSense

Excitation Sense

Shield Gnd

Pinout for Lower Connector Row

Figure 3-9. Pin-out for Strain Gage Connectors

66 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

HP E1529A Bridge Configurations

The Quarter Bridge

configuration

8-pin telcom

connector (RJ-45)

Pin 1

Strain

Bridge

RJ-45 Pin#

12345678

Pin 8

Pin 6 Pin 3

Pin 7

Pin 2

+Excitation

+Excitation Sense

+Sense

-Sense Wagner

Voltage enable

off for full bridge

-Excitation Sense

-Excitation

350

120

customer

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 sett ings for a quarter bridge channel.

Quarter Bridge

10K

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 HP E1422A (E1539A 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

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

HP E1422A’s DSP chip (Digital Signal Processor) to reflect the actual value at the user input termi nal . The onl y time you need t o cons ide r gai n is when the input voltag e times the gain woul d 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 0.5V would cause an overload reading even on the highest A/D range (16V).

-R Cal

+R Cal

External customer

shunt cal resistor

terminals

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 67Chapter 3

The Half Bridge

configuration

Figure 3-11 shows the co nnections to the 8- pin tele com connect or for a h alf bridge configuration. It also shows a simplified schematic of the bridge completion settings for a half bridge channel.

Strain

Bridge

8-pin telcom

connector (RJ-45)

RJ-45 Pin#

12345678

Pin 1 Pin 8

Pin 6 Pin 3

Pin 7

Pin 2

Pin 5 Pin 4

+Excitation

+Excitation Sense

+Sense

-Sense Wagner

Voltage enable

off for full bridge

-Excitation Sense

-Excitation

350 120

customer

-R Cal

+R Cal

Remote Rcal

Enable

10K

Half Bridge

CAL:REMote?

10K

SENS:FUNC:STRAIN:<br_type>

SENS:STR:BRIDge:TYPE

Local Rcal

Enable

Int/Ext Rcal

OUTP:SHUNT:SOUR INT | EXTOUTP:SHUNT ON | OFF

Select

(channel 0 shown)

Cal-Cal+

50K

Internal

Rcal

Excitation

to CHs 1-7

Current

Limit

Instrument.

Amplifier

X16

+Excitation Sense

-Excitation Sense

Excitation Sense

from CHs 1-31

enable excitation

Optional

Filter

2,10,100Hz

CH00 CH01

32:1 Mux

CH31

SENS:STR:EXC:STATE

+ Excitation

Excitation

CHs 0-7

Buffer

CH00 CH01

32:1 Mux

CH31

SENS:STR:CONNect BRID | EXC

Bridge Sense

from CHs 1-31

Dynamic Strain

INP:FILT:FREQ

INP:FILT:STATe

Buffer

Output

To HP E1422A

(E1539A SCP)

RJ-45

2:1

Mux

Cal+ Cal-

-R Cal

+R Cal

External customer

shunt cal resistor

terminals

Figure 3-11. Bridge Completion for a Half 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

68 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

The Full Bridge

configuration

Figure 3-12 shows the conne ction s to th e 8-pin telec om con nector for a f ull bridge configuration. It also shows a simplified schematic of the bridge completion se ttings for a full bridge chann el.

Strain Bridge

8-pin telcom

connector (RJ-45)

Pin 1 Pin 8

Pin 6 Pin 3

Pin 7

Pin 2

RJ-45 Pin#

12345678

Pin 5 Pin 4

+Excitation

+Excitation Sense

+Sense

-Sense Wagner

Voltage enable

off for full bridge

-Excitation Sense

-Excitation

350 120

customer

-R Cal

+R Cal

Remote Rcal

Enable

10K

Full Bridge

CAL:REMote?

10K

SENS:FUNC:STRAIN:<br_type>

SENS:STR:BRIDge:TYPE

Local Rcal

Enable

Int/Ext Rcal

OUTP:SHUNT:SOUR INT | EXTOUTP:SHUNT ON | OFF

Select

(channel 0 shown)

Cal-Cal+

50K

Internal

Rcal

Excitation

to CHs 1-7

Current

Limit

Instrument.

Amplifier

X16

+Excitation Sense

-Excitation Sense

Excitation Sense

from CHs 1-31

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

Bridge Sense

from CHs 1-31

Buffer

External customer

shunt cal resistor

Dynamic Strain

Output

To HP E1422A

(E1539A SCP)

2:1

Mux

Cal+ Cal-

-R Cal

+R Cal

terminals

RJ-45

Figure 3-12. Bridge Completion for a Full 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

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 69Chapter 3

Connecting to the HP E1529A’s Dynamic Strain Ports

The HP E1429A has two 37-pin connectors that provide wideband amplified outputs from eac h strain bridge signal . This allows you to connec t to a high-speed ADC-per-channel instrument like the HP E1432A or HP E1433A to capture dynamic strain events .

While an instrument like the HP E1432A or HP E1433A can measure signals from the HP E1529A, an HP E1422A is still required to control the

HP E1529A’s bridge configuration, calibration, and self-test functions. One HP E1422A can control up-to 16 HP E1529As. Figure 3- 13 s hows the

general interconnect ion layout for an HP E1432A. The cable shown is the HP E1529A Option 001. This cable is 10 feet long.

Two HP E1432As Are

16-Channel HP E1432A

Required to Monitor All 32 HP E1529A Channels

HP E1422A Provides Control

32-Channel HP E1529A

Figure 3-13. HP E1432A to HP E1529A Connection

Extending the

Dynamic Strain

Connection

If you need additional length, build or have built, an extender cable with a male 37-pin D connector o n one end and a femal e 37-pin D connecto r on the other. The extender cable must provide 16 twisted pair conductors and be overall shielded. See “Dyna mic Strain Extend er Cable Pin-Out” on page 71.

Note The spacing between the two "Buffered Output" connectors is narrow

(0.625 in.) and requires narrow connector shells. We have found two manufacturers’ parts that work well here. They are: L-COM (distributor catalog cat# SDRS37HOT) Cinch DC24660 (Newark Cat# - 45F988)

70 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

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

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 71Chapter 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 E1432A to measure t he channel u sing a more se nsitive ran ge. See Figure 3-14 for the offset DAC arrangement.

Instrument.

Amplifier

X16

Channel Buffer

8-bit offset

DAC

CH00 CH01

Optional

Filter

2,10,100Hz

Figure 3-14. Dynamic Strain Offset DAC

32:1 Mux

CH31

Buffer

Dynamic Strain

Buffered Output

SOURce:VOLTage

To HP E1422A

(E1539A SCP)

RJ-45

2:1

Mux

Cal+ Cal-

To reduce the offset voltage at each dynamic strain "Buffered Output" channel:

1. Measure an unstrained Buffered Output channel with an E1432/33

and place the value in a variable we’ll call offset_v.

2. Send minus offset_v to that channel with the SOUR:VOL T command. For example: SOUR:VOLT -offset_v,(@10000)

Note With a 13mV resolution the offset DAC can reduce the Buffered Output

channel offset to within a few millivolts of zero.

72 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Remote Strain Channel Addressing

Figure 3-15 shows the relationship between SCP positions and Remote Channel Addressing through the HP E1539A SCP (see Figure 2-1 on page 34 to compare with On-Board Channel Addressing). Not all SCP positions need to contain HP E1539As. You can if you need, mix HP E1539As and other analog sense, source, and digital I/O SCPs.

Channels measured through Remote Signal Conditioning Units like the HP E1529A Remote Strain Conditioning Unit are addressed with 5 digit

channels specifiers rather than the traditional on-board channel’s 3 digit specifier. Both 3 and 5 digit specifier star t with a "1". This is the SCPI "card number" digit and is ret ained in the HP E1422A for SCPI compatibi lity. The next 2 digits complet e the s pecif icati on of a n on-bo ard channel . When use d in a 5 digit remote multip lexed cha nne l specif ier, t he firs t 3 digits mean the same as in the on-board specifier. Digits 2 and 3 specify the HP E1539A 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 HP E1539A Remote Channel SCP. So, digits 2 and 3 will specify channels 00, 01, 08, 09, 16, 17, 24, 25, 32, 33, 40, 41, 48, 49, 56, or 57. This allows the HP E1422A to address up-to 16 HP E1529As. Digits 4 and 5 specify one of 32 channels on the RSCU and can range from 00 to 31.

Example channel addre sses (sho wn in SCPI channe l list s yntax), se e Figure 3-15 also:

Runtime Remote

Scan Verification

chan 0 on E1529A connected to on-board chan 0 (E1539A in SCP position 0).

(@10000)

chan 0 on E1529A connected to on-board chan 1 (E1539A in SCP position 0).

(@10100)

chan 24 on E1529A connected to on-board chan 48 (E1539A 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 E1529As connected to on-board channels 0 and 1 (E1539A in SCP position 0). This is 64 Chs

(@10000:10131)

channels 0 to 15 on the E1529A connected t o on-board channel 24 (E1539A in SCP position 3).

(@12400:12415)

combined previous two examples into a single scan list to show combinin g ranges.

(@10000:10131,12400:12415)

The HP E1422A provides a method to verify that remote channels in the scan list you define in algorithms or with the ROUTe:SEQuence DEFine command are succesfully scanned in each RSCU. See “Runtime Remote Scan Verification” on page 94, “The Operating Se quence” on page 127, and “Runtime Remote Scan Verification” on page 161

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 73Chapter 3

HP 1539A SCP

Position 0

(on-board addresses 00-01)

Terminal

Module

HP E1529A Remote Strain 32 Addresses 0000 - 0031

HP E1529A 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

HP 1539A SCP

Position 1

(on-board addresses 08-09)

HP 1539A SCP

Position 2

(on-board addresses 16-17)

HP 1539A SCP

Position 3

(on-board addresses 24-25)

HP 1539A SCP

Position 4

(on-board addresses 32-33)

Terminal

Module

HP E1529A Remote Strain 32 Addresses 0800 - 0831

HP E1529A Remote Strain 32 Addresses 0900 - 0931

HP E1529A Remote Strain 32 Addresses 1600 - 1631

HP E1529A Remote Strain 32 Addresses 1700 - 1731

HP E1529A Remote Strain 32 Addresses 2400 - 2431

HP E1529A Remote Strain 32 Addresses 2500 - 2531

HP E1529A Remote Strain 32 Addresses 3200 - 3231

HP E1529A Remote Strain 32 Addresses 3300 - 3331

HP 1539A SCP

Position 5

(on-board addresses 40-41)

HP 1539A SCP

Position 6

(on-board addresses 48-49)

HP 1539A SCP

Position 7

(on-board addresses 56-57)

HP E1529A Remote Strain 32 Addresses 4000 - 4031

HP E1529A Remote Strain 32 Addresses 4100 - 4131

HP E1529A Remote Strain 32 Addresses 4800 - 4831

HP E1529A Remote Strain 32 Addresses 4900 - 4931

HP E1529A Remote Strain 32 Addresses 5600 - 5631

HP E1529A Remote Strain 32 Addresses 5700 - 5731

Figure 3-15. Remote Strain Channel Addressing

74 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Programming for Remote Strain Measurement

This programming section is focused exclusively on programming the HP E1422A and HP E1529A for remote strain measurement. For more

general HP E1422A programing see Chapter 4 “Programming the HP E1422A 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 a *RST command. Where these default settings coincide with the configuration settings you require, you do not 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.

•HP E1529A input filters:

-- INPut:FILTer:FREQuency 10 ,(@<all cha nnels>)

-- 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 msec)

•FORMat ASC,7 (ASCII)

•SENSe:DATA:FIFO:MODE BLOCking

•The Defaults for the STRain Subsys tem when SENS:FUNC:STRain i s

selected will be:

-- Unstrained volta ge for all strain channels is assumed to be zero

-- Gage factor for all strain channels is assumed to be 2.

-- Excitation voltage for all st rain channels is assumed to be 1.0E6 (must be changed to the actual value to make reasonable measurements).

Description of

Strain Measurement

CALibration First To make proper measurements, *CAL? and CAL:REMote? should have

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 75Chapter 3

•The default for the HP E1529A strain configuration switches is:

-- Full Bridge (FBEN) on all 32 Channels (SENS:STR:B RID FBEN

-- Bridge output sensed.

This section describes the three ways to make stra in measurement s with the HP E1529A. It includes references to SCPI commands a s 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 375 depend on recent *CAL? and CAL:REMote? operations.

Measure Strain Using

Built-in Strain EU

Conversion

This method lets the HP E1422A convert the str ain bri dge rea dings to units of strain (∈) befor e they ar e stor ed in the CVT and/ or FIFO, or a ccesse d by algorithms. There i s no speed penalt y allowing the HP E1422A to make the Engineering Unit conv ersion to strain. In fact this is considered the "normal" HP E1422A measurement method.

When the command SENSe:FUNC:STRain:<bridge_type> is sent, the specified bridge type is configured by switches in each HP E1529A, the channel inputs are connec ted to the br idge output s (see Figu re 3-10 thro ugh Figure 3-12 starti ng on page67), and when the INIT command is se nt, bridge voltage readings are automatically converted to strain before being stored into the FIFO buffer and/or CVT (current value table).

Before the E1422 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.

You provide the above information to the E1422; 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.

2. The unstrained refere nce voltag e default val ue is 0.0 on eac h channel. There are two ways to change any channel’s value.

and there is significa nt convenience in

a. Use the MEAS:VOLTage:UNSTrained? command

(recommended), which will take an average of 3 2 voltage read ings on each specified channel and save the values internally for later use by the strain EU convers ion proc ess. Whe n using t his meth od, any loaded algorithms are not executed to avoid putting extraneous readings into th e FIFO buf fer. The voltage readings are also sent to the FIFO buffer in case you want to review them.

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 in above must be sent back to the E1422A’s EU conversion routine by using the command: SENS:STRain:UNST <voltage value>,channel list

76 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Note If an algorithm is loaded whil e 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 E1422.

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. You MUST change this value to get reasonable reading values. There are two

ways to change any channel’s value.

a. Use the MEAS:VOL Tage:EXCitation? command (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 in case you want to review them.

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 E1422A’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 additi on to th e unstr ained vo ltage readi ngs. It i s up to the user to obtain the correct data and input it into the E1422.

Figure 3-16 shows the sequence of commands to measure remote strain

channels using the built-in strain Engineering Unit Conversion routines.

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 77Chapter 3

Periodic Calibration

*CAL? and CALibration:REMote?

To convert readings to

Engineering Units of strain

Set Input Filter on HP E1529A INPut:FILTer:FREQuency, and INPut:FILTer:STATe

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 Trigger System to scan

strain bridge channels

Set up Sample Timer for best

channel-to-channel scan rate

SENSe:FUNCtion:STRain:<bridge_type>. Also sets bridge config switches and turns on excitation V

SENSe:STRain:GFACtor

MEASure:VOLTage:EXCitation?

MEASure:VOLTage:UNSTrained?

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

INITiate[:IMMediate]

TRIG[:IMM], *TRG (if TRIG:SOUR HOLD), EXTernal trig, TTLTRGn signal, or TRIG:TIMer

SENSe:DATA:FIFO:..., SENSe:DATA:CVTable?

Figure 3-16. Sequence for Built-in Strain EU Conversion

Built-in EU Conversion

Command Sequence

Here is an example VXIplug &play command sequenc e. Note that this i n not

executable, it’s been simplif ied for easi er reading. The C++ example sour ce file (euseq.cpp) is on the CD supplied with your 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)");

78 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

/* optionally set HP E1529A input filters (2, 10, or 100Hz) */ errStatus = hpe1422_cmd(sessn,"input:filter:frequency 10,(@10000:10007)"); /* optionally enable HP E1529A input filters (approx 100 KHz when OFF) */ errStatus = hpe1422_cmd(sessn,"input:filter:state ON,(@10000:10007)");

/* send gage factors to channel EU converaion 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 aquisition, 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);

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 79Chapter 3

Measure Strain Using

User Specifi ed EU

Conversion

The HP E1422 measures voltage, and then applies a conversion routine (linear) supplied by the user. The user must supply the M (slope) and B (offset) of a linear M*volt + B conversion.

The DIAGnostic:CUSTom:MXB <slope>,< offset>,(@<ch_list>) command is used to supply the sl ope and offs et for the strain co nversion. To select t he custom linear conversion to be used, the command SENSe:FUNCtion:CUSTom [<range>,](@<ch_list>) must be sent before starting mea surements wi th the INIT comma nd.

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 ohms), Q350 (quarter bridge, 350 Ohms) 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 command: [SENSe:]STRain:CONNect BRIDge,(@<ch_list>) 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 mentione d above. The user must supply M and B, which both are functions of the excitation voltage, the unstrained reference and the gage factor.

5. The E1422 must be told to use the custom conversion when taking measurements. This is done by sending the command: SENSe:FUNC:CUSTom [<range>,](@<ch_list>)

Figure 3-17 shows the sequence of commands to convert remote

measurements according to the user’s own down-loaded EU conversion method..

80 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Set bridge configuration switches

SENSe:STRain:BRIDge[:TYPE]

Set Input Filter on HP E1529A 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

Figure 3-17. Sequence for User’s Custom EU Conversion

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 81Chapter 3

SAMPle:TIMer

INITiate[:IMMediate]

TRIG[:IMM], *TRG (if TRIG:SOUR HOLD), EXTernal trig, TTLTRGn signal, or TRIG:TIMer

SENSe:DATA:FIFO:..., SENSe:DATA:CVTable?

Custom EU Conversion

Command Sequence

Here is an example VXIplug &play command sequenc e. Note that this i n not

executable, it’s been simplif ied for easi er reading. The C++ example sour ce file (mxbseq.cpp) is on the CD supplied with your 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)");

/* enable excitation voltage to strain bridges. Note that excitation is switched in banks of channels. So "E1529A 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 */

82 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 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 you want to use this method, you will make volt age measu reme nts at t he strain bridges while unstrained, then again while under strain. You will also measure the excitatio n volta ge at eac h bridg e. Using th is dat a as well as the gage factor, you calculate strain conversion equations in your computer.

1. Set the measurement function to voltage with the [SENSe:]FUNC:VOLT <range>,(@<ch_list>)

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 ohms), Q350 (quarter bridge, 350 Ohms) 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 command: [SENSe:]STRain:CONNect BRIDge,(@<ch_list>) The power on and reset setting is BRIDge.

4. Use the MEAS:STR:UNSTrained? (@<ch_list>) command 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, any loaded algorithms are not executed to avoid putting extraneous readings into the FIFO buffer.

5. Use the MEAS:STR:EXCitation? (@<ch_list>) command 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 t his method, a ny loaded al gorithm(s) ar e not executed to avoid putting extraneous values into the FIFO buffer.

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 83Chapter 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 t o measure the out put voltage at eac h strain brid ge. 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. Now you ret rieve the readings and ca l culate 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 po st-processing.

84 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Readings returned in voltage

SENSe:FUNCtion:VOLTage

Set bridge configuration switches

Set Input Filter on HP E1529A 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

Set up the analog input Scan List

Set up Trigger System to scan

strain bridge channels

Set up Sample Timer for best channel-to-channel scan rate

SENSe:STRain:BRIDge[:TYPE]

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

Here is an example VXIplug &play command sequenc e. Note that this i n not

executable, it’s been simplif ied for easi er reading. The C++ example sour ce file (voltseq.cpp) is on the CD supplied with your instrument. View the readme.txt file provided with the VXIplug&play driver for example program file location.

/* set channel function for voltage readings (autorange) */

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 85Chapter 3

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 HP E1529A input filters (2, 10, or 100Hz) */

errStatus = hpe1422_cmd(sessn,"input:filter:frequency 10,(@10000:10007)"); /* optionally enable HP E1529A 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 foactor * * and calculate individual strain values for each channel using * * your own equations. * * * *********************************************************************/

86 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Verifying Correct Bridge Completion (Shunt Cal)

You’re probably familiar with verifying your bridge configurations and connections by inserting a known resistance (shunt cal resistor) in parallel with one leg of the bridge to imbalance it by a predictable amount. The HP E1529A provides a single internal 50KΩ shunt cal resistor that can be programmatically con nected t o each of the 32 channels , 1 channe l at a time. The HP E1529A 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.

Figure 3-19. User Shunt Cal Resistor Connection

For the following discu ssion, r efer to Figur e 3-10 t hrough Fi gure 3- 12. The OUTPut:SHUNt:SOURce INT | EXT,(@<ch_list>) selects either the INTernal (built-in) or EXTernal (user supplied) shunt cal resistor. Use the OUTput:SHUNt ON | OFF,(@<ch_list>) command to actua ll y 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 HP E1529A. This is because a single resistor is use d to shunt each of an HP E1529As 32 channels. When the command is sent to connect another channel, the previously closed channel is opened. T o perform shu nt cal on multip le channels, your 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 you only need to send OUTP:SHUN OFF to open the last channel closed on a particular HP E1529A.For quarter bri dge completion, the shunt cal resistor is connected locally (on-board the HP E1529A). For both half and full bridge completion, th e shunt cal resistor is connected remot ely via th e -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 your instrument. View the readme.txt file provided with the VXIplug&play driver for example program file location.

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 87Chapter 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 channel

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?

88 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Built-in Strain Conv ersion Equations

When you use the HP E1422A’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 )

This equation is used by th e HP E1422A to convert bridge measur ements 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

excitation

unstrained

= measured voltage value

= excitation voltage

= unstrained voltage

×()⁄=

excitation

gFactor = gage factor

This equation is used by th e HP E1422A to convert bridge measur ements 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 excitation unstrained

= measured voltage value

= excitation voltage

= unstrained voltage

×()⁄×=

excitation

gFactor = gage factor

Quarter Bridge Equation

(bridge_type=Q120,

Q350, or USER)

Programming the HP E1422A & HP E1529A for Remote Strain Measurement 89Chapter 3

This second-order equati on is the used by the HP E1422A to convert bridge measurements to Engineering Units of Strain for on-board strain SCP channels only. Because HPE1529As can expand the HP E1422As strain channel count to 512, use of this non-linear strain conversion equation would require too much HP E1422A memory. Instead, a linear approximation of this equa tion is used. See below. For the following equations, V

and V

= bridge output whil e strain ed, Vu = bridge output unst rained,

= excitation volta ge at the bridge.

Quarter Bridge Equation for Strain SCPs only

Strain

4V–

-------------------------------

= WhereV

GF 12V

+()

ViVu–

---------------- -

Quarter Bridge Equation for HP E1529A only

Strain a2V

++=

a1Via

4 V

-------------------------------- -

VeV

+()

GF V

Where a

-------------------- -

GF V

, a

44VuV

-------------------------------- -

GF V

+()–

, a

===

Error Analysis

Figure 3-21 compares the non-linear quar ter bridge equati on used for strai n SCPs with the linear appr oximat ion u sed wi th t he HP E1529A. 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

1000

-100000 -80000 -60000 -40000 -20000 0 20000 40000 60000 80000 100000

GF=1 GF=2 GF=5

-1000

Delta Strain in Micro Strain

Figure 3-21. Error of Quarter Bridge Linear Approximation

90 Programming the HP E1422A & HP E1529A for Remote Strain Measurement Chapter 3

Chapter 4

Programming the HP E1422A for

Dat a Acquisition and Control

About This Chapter The focus in this chapter is to show the HP E1422’s general programming

model. The programming model is basically the sequence of SCPI commands your applica tion program will send to the HP E1422 to configure it to execute the de fined Scan List and/or algorithms. This chapt er cont ains:

• Overview of the HP E1422A Multifunction DAC Module . . . . . . 92

Multifunction DAC? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Flexible Signal Conditioning for Input and Output . . . . . . . . 93

Remote Multiplexing and Signal Conditioning . . . . . . . . . . . 93

Programmable Signal Conditioning and EU Conversion. . . . 94

Scan List and/or ’C’ Language Control Programming. . . . . . 94

Runtime Remote Scan Verification. . . . . . . . . . . . . . . . . . . . . 94

Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

• Executing the Programming Model . . . . . . . . . . . . . . . . . . . . . . . . 99

Programming Overview Diagram. . . . . . . . . . . . . . . . . . . . . . . 102

-- Setting up Analog Input and Output Channels. . . . . . . . . . . . . 103

Configuring Programmable Analog SCP Parameters. . . . . . 103

Linking Input Channels to EU Conversion. . . . . . . . . . . . . . 105

Linking Output Channels to Functions . . . . . . . . . . . . . . . . . 113

-- Setting up Digital Input and Output Channels . . . . . . . . . . . . . 113

Setting up Digital Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Setting up Digital Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . 114

-- Performing Channel Calibration (Important!) . . . . . . . . . . . . . 117

Calibrationg the HP E1422A . . . . . . . . . . . . . . . . . . . . . . . . 117

Calibrating Remote Signal Conditioning Units . . . . . . . . . . 118

-- Defining an Analog Input Scan List (ROUT:SEQ:DEF) . . . . . 119

-- Defining C Language Algorithms. . . . . . . . . . . . . . . . . . . . . . . 120

Global variable definition . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Algorithm definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Pre-setting Algorithm Variables . . . . . . . . . . . . . . . . . . . . . . 121

-- Defining Data Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Specifying the Data Format . . . . . . . . . . . . . . . . . . . . . . . . . 122

Selecting the FIFO Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

-- Setting up the Trigger System. . . . . . . . . . . . . . . . . . . . . . . . . . 123

Arm and Trigger Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Programming the Trigger Timer. . . . . . . . . . . . . . . . . . . . . . 125

-- INITiating the Module/Starting Scanning and Algorithms. . . . 126

The Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

-- Reading Running Algorithm Values. . . . . . . . . . . . . . . . . . . . . 128

Reading CVT Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Reading FIFO Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Which FIFO Mode? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Programming the HP E1422A for Data Acquisition and Control 91Chapter 4

Reading Algorithm Variables Directly . . . . . . . . . . . . . . . . . 132

-- Modifying Running Algorithm Variables. . . . . . . . . . . . . . . . . 132

Updating the Algorithm Variables and Coefficients. . . . . . . 132

Enabling and Disabling Algorithms . . . . . . . . . . . . . . . . . . . 133

Setting Algorithm Execution Frequency. . . . . . . . . . . . . . . . 134

• Example SCPI Command Sequence. . . . . . . . . . . . . . . . . . . . . . . 134

• Example VXIplug&play Driver Function Sequence . . . . . . . . . . 135

• Using the Status System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

• HP E1422 Background Operation. . . . . . . . . . . . . . . . . . . . . . . . . 143

• Updating the Status System and VXIbus Interrupts . . . . . . . . . . . 143

• Creating and Loading Custom EU Conversion Tables. . . . . . . . . 145

• Compensating for System Offsets. . . . . . . . . . . . . . . . . . . . . . . . . 148

• Detecting Open Transducers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

• More On Auto Ranging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

• Settling Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Overview of the HP E1422A Multifunction DAC Module

This section describe s how the HP E1422 gath ers input dat a, executes it s 'C' algorithms, and sends its output data. Figure 4-1 shows a simplified

92 Programming the HP E1422A for Data Acquisition and Control Chapter 4

functional block diagram.

Figure 4-1. Simplified Functional Block Diagram

Multifunction DAC? The HP E1422 is a complete data acqusition and control sys tem on a s ingle

VXI card. It is multifunction because it uses the Signal Conditioning Plug-on(SCP) concept whereby you can mix and match your analog input/output and digital input/output channels to meet various application needs. It can be self-contained because it has local intelligence to permit the card to run s t and-alone with very little interaction required from the supervisory computer.

Flexible Signal

Conditioning for Input

and Output

Remote Multiplexing and

Signal Conditioning

The HP E1422 has eight SCP positions with each SCP position capable of addressing up to 8 channels of input or 8 cha nnels of out put for a total of 64 channels. These 64 c hannels are k now as th e on-board channels. The 8 SCP slots can be used for any of the twenty-plus analog/digital SCP’s available for the E1422 which cover most data acquisition and control needs.

In addition, each SCP slot that contains an HP E1539A SCP can operate two Remote Signal Conditio ning Units (RSCUs) that each externally multiplexes up-to 32 channels. These channels are known as remote channels because they are multiplexed remotely to the HP E1422. So, with 32 channels per RSCU and 16 RSCUs, the HP E1422 can make analog

Programming the HP E1422A for Data Acquisition and Control 93Chapter 4

measurements on 512 remote channels. The upper left corner of Figure 4-1shows how Remote Signal Conditioning Units fit in.

Programmable Signal

Conditioning and EU

Conversion

Scan List and/or ’C’

Language Control

Programming

Runtime Remote Scan

Verification

You configure the input and output SCP’s with the SCPI and/or VXIplug&play programming. Analo g SCP’s are measured with the E1422’s A/D. Configuring the analog SCP’s includes specifying what type of Engineering Unit (EU) conversion you want for eac h analog input ch annel. For example, one channel may require a type T thermocouple conversion and another may be a resistance measuremen t. The on-bo ard Digit al Sign al Processor(DSP) converts the voltage read across the analog input channel and applies a high-speed conversion which results in temperature, resistance, etc. Digi tal input SCP’s perform their own conversions as configured by the SCPI language.

The HP E1422 can be used as ei ther a conventi onal Scan List con trolled data acquisition unit with analog measurements automatically buffered and available to the su pervisory compute r, or the HP E1422 can execut e its own

internal ’C’ language algorithms which can perform data acquisition and control and pass values to the supervisory computor 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 need ed to pe rhaps moni tor s ome of the data po ints a nd make control decisions.

The HP E1422A provides a method to verify that remote channels in the scan list you define in algorithms or with the ROUTe:SEQuence DEFine command are succesfully scanned in each RSCU. Special algorithm variables are available to check the operating status of each HP E1539A main channel. This allows you to guard against an RSCU failing to scan remote channels because of a signal cable disconnect or a power failure at the RSCU.

Operational

Overview

When the Trigger System is co nfigur ed and ei ther g enerat es it s own tri gger or accepts a trigger from an external source, an instrument operation cycle begins. A simplified description of cycle follows.

Acquire Input Values All digital input SCP's latch their current input state and the A/D st arts

scanning the analog channels specified in the Scan List with the ROUTe:SEQuence:DEFine command or ana log channels referenced by a ny ’C’ algorithms. All measurement data as seen by the ’C’ algorithms is represente d as 32-bit real numbers even if the inp ut channel is inherently integer (digital byte/word). The EU-conver ted numbers such as temper ature, strain, resistance, volts, state, frequency, etc. when from Scan List channels (ROUT:SEQ:D EF) is stored b y default in the Current Value Table (CVT), and the FIFO reading b uffer. Values fro m analog channels re ferenced by ’C’ algorithms are stored in an Input Buffer and later accessed by those 'C' algorithms executing on the E1422 card.

Analog input values from channels in the Scan List, stored in the FIFO and/or CVT can be read from the HP E1422 without creating or r unning any ’C’ algorithms . This makes for e asy tradition al analog data acq usition where no control aspect is required.

94 Programming the HP E1422A for Data Acquisition and Control Chapter 4

Start Algorithms Approximately 2000 lines of user-written ’C’ code can be downloaded into

the E1422’s memory and can be split among up to 32 algorithms. HP refers to these as algorithms because an algorithm is a step-by-step procedure for solving some problem or accomplishing some end. Though the documentation continues to refer to the ’C’ code as algorithms, you may think in traditiona l te rms a s ea ch al gor it hm re pre se n ti ng a ’C’ function with a main() program which calls them.

The user-written ’C’ algorithms execute after all analog/digital inputs have been stored in the Input Buffer . The ’C’ code accesses the measureme nt data like constants with the names of I100-I163 (for on-board channels) and I10000-I15731 (for remote channels) representing the 32-bit real EU-converted numbers. As seen in Figure 3-1, the algorit hms have access to both local and global variables and arrays. The I-variables are inherently global and accessible by any algorithm. Local variables are only visible to the particular algori thm (just like in ’C’ functions). Declared global variables can be shared by any algorithm.

Communicating with

Algorithms

Algorithms Control

Output Values

Your application program can read or write any local or global variable in any algorithm by using SCPI syntax that actually identifies the variable by name, but a more efficient means of reading data is available through the E1422’s FIFO and Current Value Table(CVT). As seen in Figure 3-1, any algorithm can write any expression or constant to the FIFO/CVT. Your application can then read the FIFO/CVT to characterize what’s happening inside the E1422 and to provide an operator view of any input/output channel, variable, or constant.

Output SCP’s derive their channel values from O-variables that are written by the algorithms. O100-O163 are read/write global variables that are read after all algorithms have finished executing. The 32-bit real values are converted to the appropriate units as defined by the SCPI configuration commands and written to the va rious output SCP’s by channel number.

Figure 4-2. Instrument Operation Cycle Phases

Programming the HP E1422A for Data Acquisition and Control 95Chapter 4

Detailed Instrument

Operation Cycle

Figure 4-2 illustrates the timing of all these operations and describes the E1422’s input-update-execute algorithms-output phases. This cycle-based design is desirable b ecause it results in d eterministic opera tion of the E1422. That is, the input channels are always scanned, and the output channels are always written at pre-defined intervals. Note too that any number of input channels or output channels are accessible by any of up to 32 user-written algorithms. The algorithms are named ALG1-ALG32 and execute in numerical order.

In Phase 1, all input channels specified in the ROUTe:SEQuence:DEFine command and/or referenced in downloaded algorithms are sc anned.

Phase 1A is for Runtime Remote Scan Verification and is optional. When one or more special scan status variables (S1xx) are included in an algorithm, this time is required to evalua te the scan status of each HP E1539A SCP channel reference by a status variable. The time required

µS + 40µS * (number of S1xx vars referenced). If no status variables

is 230 are referenced in any algorithms, then Phase 1A is not executed.

Notice the Update Window (Phase 2) illustr ated in Figure 4-2. This window has a user-specified le ngt h and is used to acce pt and make chan ges to loc al and global variables from the supervisory computer. Up to 512 scalar or array changes can be made while executing algorithms. Special care was taken to make sure all changes take place at the same time so that any particular algorithm or group of algorithms all operate on the new changes at a user-specifi ed time. This does not mea n that all scal ar and array change s have to be received during one cycle to become effective at the next cycle. On the contrary, it may take a number of cycles to download new values, especially when trying to re-write 1024 element arrays and especia lly when the trigger cy cle time is very short.

There are multiple times between the base triggers where scalar and array changes can be accep ted fr om the su pervis ory compu ter, a nd thes e change s are kept in a holding buffer until the supervisory computer instructs the changes to take effect. These changes then take place during the Update window and take effect BEFORE algorithms start executing. The "do-update-now" sig nal can be sent by command( ALG:UPD) or by a change in a digital input state(ALG:UPD:CHAN). In either case, the programmer has control over when the new changes take effect.

The E1422’s ability to execute programs directly on the card and its fast execution speed give the programmer real-time response to changing conditions. And, programming the card has been made very easy to understand. HP chose C as the language used to write user programs since that language is already considered the industry standard. Choosing C allows you to write algorithms on PC’s or UNIX workstations that have C compilers, so you can debug algorithms before execution on the card. The E1422 also provides good debugging tools that permit you to determine worst-case execution speed, monitor variables while running, and selectively enable/disable any of the E1422’s 32 algorithms.

HP created a limited and simplified version of C since most applications need only basic oper ation s: add, subtra ct, mult iply , divide , scal ar var iable s, arrays, and programming constructs. The programming constructs are

96 Programming the HP E1422A for Data Acquisition and Control Chapter 4

limited to if-then-el se to al low condi tiona l eval uation and resp onse to inpu t changes. Since all algorithms have an opportunity to execute after each time-base trigger, the if-then-else construc ts pe rm i t conditional skipping of cycle intervals so that some code segments or algorithms can execute at multiples of the cycle time instead of every cycle.

Looping constructs such as for or while are purposely left out of the language so that user programs are deterministic. Note that looping is not really needed for most applications since the cycle interval execution (via the trigger syste m) of e ver y algorithm has inherent repeat loopin g. W ith n o language looping construc ts, the HP E1422’s C compiler can perform a worst-case branch analysis of user programs and return the execution time for determining the minimum time-base interval. Making this timing query available allows the programmer to know exactly how much time may be required to execute any/all phases before attempting to set up physical test conditions.

Note the darker shaded portion at the end of the Execute Algorithms Phase in Figure 4-2. The condit ional execut ion of code can cause the len gth of this phase to move back and fort h like an acc ordion. This ca n cause undesi rabl e output jitter when t he beginning of th e output phase starts immediat ely after the last user algorithm executes. The HP E1422’s design allows the user to specify when output signals begin relative to the start of the trigger cycle. Outputs then always occur at the same time, every time.

The programming task is furt her made e asy wit h this d esign b ecause all t he difficult structure of handling input and output channels is done automatically. Thi s is not true o f many other pr oducts that may ha ve several ways to acquire meas urement data or wr ite result s to its I/O cha nnels. When the E1422’s user-written C algorithms are compiled, input channe ls and output channels are detected in the algorithms and are automatically grouped and configured for the Input and Output phases as seen in Figure 4-2. Each algorithm simply acc ess es input cha nnel s as var iab le s and wr it es to output channels as variables. The rest is handled and optimized by the Input and Output phases. You’re left to think of solving your application in terms of input and output values variables rather than worrying about how to deal with each SCP’s differences.

Programming the HP E1422A for Data Acquisition and Control 97Chapter 4

Programming Model

You configure, start, stop, and communicate with the HP E1422 using its SCPI commands and/or VXIplug&pl ay driver functions. The modul e can be in one of two states; either the "idle" state, or the "running" state. The INITiate[:IMMediate] command moves the module from the "idle" state to the "running" state. We will call these two states "before INIT", and "after INIT". See Figure 4-3 for the following discussion.

Before INIT the module is in the Trigger Id le State and its DSP chip (the on-board control processor) is ready to accept virtually any of its SCPI or Common commands. At this point, you will send it commands that configure SCPs, link input channels to EU conversions, configure Remote Signal Conditioning Units, configure digital input and output channels, define a Scan List, conf igure the trigger system, and define control algorithms.

After INIT (and with trigge r events occurring), the DSP is busy measur ing input channels, executin g algorithm code, sending int ernal algorithm val ues to the CVT, and updating control outputs. To insulate the DSP from commands that would inter rupt its meas urem ent sca nning and/ or algori th m

execution, the HP E1422’s driver disallows execution of most SCPI commands and VXIplug&play functions after INIT. The driver does allow certain commands that make sense while the module is scanning and running algorithms. These are the commands that read and update algorithm variables, retrieve data aquisition values from the CVT and FIFO, and return Status System values. The Command Reference Section (Chapter 6) specifies whether a command is accepted before or after INIT.

The next section in this chapter ("Executing the Programming Model") shows the programming se quence that should be followed when setting up the HP E1422 to make measurement scans and/or run algorithms.

98 Programming the HP E1422A for Data Acquisition and Control Chapter 4

Before INIT

Commands Accepted: All commands exept:

*TRG, TRIGGER, and ALG:UPD:CHAN

Power-On

Trigger Idle

State

INITiate[:IMM]

After INIT

Commands Accepted: *RST

ABORT Most of ALG subsystem ARM[:IMM] FETCH? FORMAT SENSe:DATA... STATus ... SYSTem ... *TRG & TRIGger[:IMMediate] (if TRIG:SOUR is HOLD)

Waiting for

Trigger State

TIMerorother

trigger event

Input,

Execute Algs,

Output

Figure 4-3. Module States

Executing the Programming Model

This section shows the sequen ce of programming steps that should be used for the HP E1422. Within each step, most of the available choices are shown using command sequence examples, with further details available in the Command Reference Chapter 6.

*RST or ABORT?

yes

Trig Count

Exhausted?

yes

IMPORTANT! Most programming difficulties can be resolved by you if you know what’s

wrong. It is very important while developing your application that you execute the SYSTem:ERRor? c ommand after each progr amming command. This is the only way you will know if there is a programming error. SYST:ERR? returns an error number and description (or +0, "No Error").

Programming the HP E1422A for Data Acquisition and Control 99Chapter 4

Power-on and *RST

Default Settings

•No algorithms defined

•No channels defined in channel lists

•Programmable SCPs configured to their Power-on defaults

(see individual SCP User’s Manuals)

•All analog input channels linked to EU conversion for voltage

•All analog output channels ready to take values from an algorithm

•All digital I/O channels set to input static digital state

•ARM:SOURce IMMediate

•SAMPle:TIMer 40E-6 (40µsec)

•TRIGger:SOURce TIMer

•TRIGger:COUNt 1 (note that this defa ult was chosen to

make testing data aquisition scan list easier. For algorithm operation, you will probably want to change the count to INFinite.)

•TRIGer:TIMer .010 (10 msec)

•FORMat ASC,7 (ASCII)

•SENSe:DATA:FIFO:MODE BLOCking

Figure 4-4 provides a quick reference to the Programming model. Refer to

this, together with the “Programming Overview Diagram” to keep an overview of the HP E1422 SCPI programming sequence. Again, where default settings ar e what you want, you can skip that configuration step

100 Programming the HP E1422A for Data Acquisition and Control Chapter 4

Agilent E1422A User’s and SCPI Programming Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

HEWLETT-PACKARD WARRANTY STATEMENT

Safety Symbols

WARNINGS

Declaration of Conformity

Reader Comment Sheet

Content s

About this Chapter

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 Your Wiring Layout

Faceplate Connector Pin-Signal Lists

Optional Terminal and Connector Modules

Preferred Measurement Connections

Connecting the On-board Thermistor

Wiring and Attaching the Terminal Module

Removing the HP E1422 Terminal Modules

Attaching and Removing the HP E1422 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 we get into the s pecifics of co nfiguring a Re mote 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 b etween P.C. board loc ation and bridg e

Installing Resistors Figure 3-4 shows a typical us er selected 1/4 bri dge resistor instal lation. Note

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 Conv ersion Equations

About This Chapter The focus in this chapter is to show the HP E1422’s general programming

Multifunction DAC? The HP E1422 is a complete data acqusition and control sys tem on a s ingle

Acquire Input Values All digital input SCP's latch their current input state and the A/D st arts

Start Algorithms Approximately 2000 lines of user-written ’C’ code can be downloaded into

Programming Model

Executing the Programming Model