YOKOGAWA WE7231 Manuale utente

User’s

Manual 30-CH Fast Digital

Thermometer Module

IM 707231-01E

1st Edition

IM 707231-01E

Disk No. WE16

1st Edition: Norbember 2001 (YK)

Foreword Thank you for purchasing the WE7231 30-CH Fast Digital Thermometer Module, a PC-

based measurement instrument for the WE7000.

This user’s manual contains useful information about the functions and operating

procedures of the WE7231 as well as precautions that should be observed during use.

This manual is written with the assumption that you will be using the WE7000 Control

Software that is included with the measuring station.

For general information about the WE7000, (primarily the operations of the measuring

station, the optical interface module, the optical interface card, and the WE7000 Control

Software) see the WE7000 User’s Manual (IM 707001-01E).

Manual Title Manual No.

WE7000 User’s Manual IM707001-01E

To ensure proper use of the instrument, please read this manual thoroughly before

beginning operation.

After reading the manual, keep it in a convenient location for quick reference in the event

a question arises.

Notes •This manual was written for version 4.2.0.0 of the WE7000 Control Software and

module firmware version 3.05. The operating procedures and screen contents

described in this manual may differ from those in other versions of the software.

•The contents of this manual are subject to change without prior notice as a result of

improvements in the instrument’s performance and functions.

•Every effort has been made in the preparation of this manual to ensure the accuracy

of its contents. However, should you have any questions or find any errors, please

contact your nearest YOKOGAWArepresentative listed on the back cover of this

manual.

•Copying or reproduction of all or any part of the contents of this manual without the

permission of Yokogawa Electric Corporation is strictly prohibited.

Trademarks •Microsoft, Windows, and Windows NT are trademarks or registered trademarks of

Microsoft Corporation in the United States and/or other countries.

• Adobe and Adobe Acrobat are trademarks of Adobe Systems incorporated.

• All other company and product names used in this manual are trademarks or

registered trademarks of their respective companies.

Revisions 1st Edition: November 2001

2IM 707231-01E

Checking the Contents of the Package

Unpack the box and check the contents before operating the instrument. If some items

are missing or otherwise inconsistent with the contents description, please contact the

dealer from which you purchased them.

Measurement Module

Check that the model name given on the name plate matches the one on your order

form.

Model

Model Suffix Code Description

707231 WE7231 30-CH Fast Digital Thermometer Module

707231 /HE English help message

NO. (Instrument Number)

When contacting the dealer from which you purchased the instrument, please give them

the instrument number.

MODEL

NO.

Made in Japan

Accessories The following standard accessories are supplied with the instrument. Make sure that all

items are present and undamaged.

One user’s manual (this document)

IM 707231-01E

Optional Accessories (Sold Separately)

Part Name Model Code Description

30-CH Scanner Box 707815 M4 screw terminal and 1 meter connecting cable

30-CH Scanner Box 707815/L3 M4 screw terminal and 3 meter connecting cable

Connecting cable

IM 707231-01E

How to Use This Manual

Structure of the Manual

This manual consists of four chapters and an index as shown below.

Chapter Title Description

1Functions Describes the system configuration and functions.

2Hardware Preparation Explains how to install the module into the measuring

station, and how to connect the input.

3Troubleshooting and Explains the procedures for troubleshooting and self-

Maintenance testing.

4Specifications Outlines the specifications of the module.

Index An alphabetical index.

Conventions Used in This Manual

•Units

kDenotes 1000. (For example, 100 kHz)

KDenotes 1024. (For example, 720 KB)

•Boldface Characters

Characters set in boldface usually refer to items on-screen or on the instrument (such

as knobs, windows and buttons) with which the user interacts.

•Symbols

The following symbols are used in this manual to alert you to important information.

This symbol is affixed to the instrument, and indicates that due to

possible danger to the user or instrument, the user’s manual should

be consulted. It is also printed on the corresponding reference

page in the user’s manual.

WARNING Describes precautions that should be observed to prevent injury or

death to the user.

CAUTION Describes precautions that should be observed to prevent minor or

moderate injury to the user, or damage to the instrument.

Note

Provides information that is important for proper operation of the

instrument.

4IM 707231-01E

IM 707231-01E

Index

Contents

Foreword .......................................................................................................................................... 1

Checking the Contents of the Package ............................................................................................. 2

How to Use This Manual...................................................................................................................... 3

Chapter 1 Functions

1.1 System Configuration and Block Diagram ..............................................................................1-1

1.2 Operation Panel......................................................................................................................1-3

1.3 Setting Measurement Conditions............................................................................................1-5

1.4 Setting the Alarm ....................................................................................................................1-8

1.5 Waveform Display, Automatic Saving of Measured Data, File Conversion,

and Other Functions .............................................................................................................1-10

1.6 Name and Functions of Each Part........................................................................................ 1-11

Chapter 2 Hardware Preparation

2.1 Mounting Modules in the Measurement Station .....................................................................2-1

2.2 Connecting the 30-CH Scanner Box and the Input Signal Wire ............................................. 2-3

Chapter 3 Troubleshooting and Maintenance

3.1 Troubleshooting ......................................................................................................................3-1

3.2 Self Test .................................................................................................................................. 3-2

3.3 Maintenance ...........................................................................................................................3-3

Chapter 4 Specifications

4.1 Performance Specifications .................................................................................................... 4-1

4.2 Factory Default Settings .........................................................................................................4-4

4.3 General Specifications ............................................................................................................4-5

4.4 Specifications for the 30-CH Scanner Box .............................................................................4-6

4.5 External Dimensions...............................................................................................................4-7

Index ................................................................................................................................ Index-1

1-1

IM 707231-01E

Functions

1.1 System Configuration and Block Diagram

System Configuration

The following is an example in which the 30-CH Fast Digital Thermometer WE7231 is

installed into the measuring station and the measuring station is connected to a PC with

the optical fiber cable.

DUT

Optical fiber cable

Measuring station

Optical

interface

modules

WE7231 PC

Optical interface card

30-CH Scanner

Box (sold separ

separately)

Block Diagram

CH1

CH2

CH3

CH4

CH15

CH16

A/D

Input signal processing

circuit for CH1-CH15

Input signal processing

circuit for CH16-CH30

DPRAM

CPU

32bits RISC

ATT

0/40dB

CH30

CH15c

CH30c 30-CH Scanner Box

Memory

Module control

program

(flash memory)

Scan signal

Internal bus

WE bus

Power

supply

Amplifier

circuit

Voltage control circuit

WE7231 30-CH Fast Digital

Thermometer Module

RJC

WE bus interface

Acquisition

control circuit

Connecting cable

Chapter 1 Functions

1-2 IM 707231-01E

Description of Operation

The 30-CH Scanner Box (sold separately) connects to the input connector of the 30-CH

Fast Digital Thermometer WE7231 using the connecting cable, and the devices under

measurement are connected to each terminal of the 30-CH Scanner Box. If the device

under measurement is a thermocouple or if you are measuring DC voltage, the input

terminals are connected using a 2-wire system. When measuring resistance or

resistance temperature detectors, a 4-wire system is used.

A scanning signal is sent through the connecting cable from the WE7231 to the 30-CH

Scanner Box, and the response from the device under measurement determines which

signals are selected for input to the WE7231.

With thermocouple or DC voltage input measurement, the input signal is modified in the

attenuator (ATT) and amplifier circuits then undergoesA/D conversion. When measuring

resistance such as in resistance temperature detectors, a constant current is given

through the connecting cable from the WE7231 to the device being measured, and in the

same manner as during thermocouple or DC voltage input measurement, the voltage

signal generated at both ends of the device being measured is input to the WE7231

where it undergoes A/D conversion. These converted digital signals are isolated in the

photocoupler and the digital data which represents the measured values is stored in

memory.

When measuring temperature, the reference junction temperature is measured using the

platinum resistance temperature detector inside the scanner box, and the CPU performs

reference junction compensation, or RJC, (this function can be turned ON/OFF) and

voltage-temperature conversion on the previously stored measurement data from the

thermocouple. These results are then re-stored. The data stored in memory can be

recalled from a PC through communications.

1.1 System Configuration and Block Diagram

1-3

IM 707231-01E

Functions

1.2 Operation Panel

The WE7000 Control Software installed in the PC is used to control the 30-CH Fast

Digital Thermometer WE7231. The WE7000 Control Software displays operation panels

similar to those shown in the figure below. This user’s manual does not explain the

operations of the operation panel or waveform monitor. For these operations, see the

WE7000 Control Software’s online help.

Basic Settings

Start/stop measurement

Select the sampling interval

Turn the waveform monitor

ON and OFF

Display theTable Entry

window (see next page)

Select for automatic burn out detection

Execute burn out detection

Display settings for

channels 16-30

Select the measurement function

Select the measuring range/type of thermocouple

Select the reference channel

(for difference between channels

calculation)

Execute NULL measurement

on channels set to use the null value

Alarm occurrence

status indication

Select to put the alarm occurrence status indication on hold

Click to release alarm occurrence status indication hold

Burn out detection indicator

Other Settings

Select the measurement channel

Select to calculate the difference from the reference channel

Select to use the NULL value

Toggle the reference junction compensation (RJC)

between Internal and External

Input the reference junction temperature for

external reference junction compensation (RJC)

Select the units of temperature

Select the time base

Select to enable fast scan mode

Select to use the moving average as the measured values

Set the number of samples for the moving average

Set alarm detection by group

Set alarms for the measurement channels

1-4 IM 707231-01E

Table Entry Window

Select the measurement function

Select to enable fast scan mode

Copy settings

Select the Label Select the type of thermocouple and resistance temperature

detector, and the measuring range

Select the

reference channel

Enter the alarm output settings

Select items to be copied

Select to hide alarm output and reference channel settings

Select to calculate the difference from the reference channel

Select to use the NULL value

Select to average the measured values

Set the number of samples used for averaging

Paste settings

Displaying Alarm Status and Burn out by Channel

Select groups for alarm status display or burn out

Green indicator: channels from the measured group set to output alarms

(When alarm occurs, color changes from green to red)

When displaying the Burn Out status, the indicators of the burned

out channels change from green to red.

Grey indicator: channels in the measured group currently not being measured

Black indicator: channels not set to output alarms

Note

When an alarm occurs frequently, the alarm status display overloads processing resources and

may make it impossible to perform panel operations such as setting changes. If this happens,

turn the Monitor setting OFF.

1.2 Operation Panel

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