YOKOGAWA WE7231 User Manual
User’s
Manual
30-CH Fast Digital
Thermometer Module
Yokogawa Electric Corporation
IM 707231-01E
1st Edition
Foreword
Notes
Thank you for purchasing the WE7231 30-CH Fast Digital Thermometer Module, a PCbased 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.
• 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 YOKOGAWA representative 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
Disk No. WE16
1st Edition: Norbember 2001 (YK)
All Rights Reserved, Copyright © 2001 Yokogawa Electric Corporation
IM 707231-01E
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Checking the Contents of the Package
MODEL
NO.
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
2
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
1 Functions Describes the system configuration and functions.
2 Hardware Preparation Explains how to install the module into the measuring
3Troubleshooting and Explains the procedures for troubleshooting and self-
Maintenance testing.
4 Specifications Outlines the specifications of the module.
Index An alphabetical index.
Conventions Used in This Manual
• Units
k Denotes 1000. (For example, 100 kHz)
K Denotes 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.
station, and how to connect the input.
• 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
CAUTION
Note
Describes precautions that should be observed to prevent injury or
death to the user.
Describes precautions that should be observed to prevent minor or
moderate injury to the user, or damage to the instrument.
Provides information that is important for proper operation of the
instrument.
IM 707231-01E
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IM 707231-01E
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
1
2
3
4
Index
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
IM 707231-01E
5
Chapter 1 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.
1
Functions
Block Diagram
CH1
CH2
CH3
CH4
CH15
CH15c
G
Measuring station
Scan signal
RJC
Optical
interface
modules
Optical fiber cable
DUT
DC
Connecting cable
WE7231
30-CH Scanner
Box (sold separ
separately)
-
+
ATT
0/40dB
Amplifier
circuit
-
Voltage control circuit
+
Optical interface card
Power
supply
WE7231 30-CH Fast Digital
Thermometer Module
A/D
Acquisition
control circuit
Input signal processing
circuit for CH1-CH15
PC
Internal bus
CPU
32bits RISC
DPRAM
Memory
WE bus interface
CH16
CH30
CH30c
30-CH Scanner Box
Input signal processing
circuit for CH16-CH30
Module control
program
(flash memory)
WE bus
IM 707231-01E
1-1
1.1 System Configuration and Block Diagram
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 (A TT) and amplifier circuits then undergoes A/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.
1-2
IM 707231-01E
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
Select the measurement function
Select the measuring range/type of thermocouple
Alarm occurrence
status indication
Select to put the alarm occurrence status indication on hold
1
Functions
Start/stop measurement
Turn the waveform monitor
ON and OFF
Select the reference channel
(for difference between channels
calculation)
Select the sampling interval
Execute NULL measurement
on channels set to use the null value
Display the Table Entry
window (see next page)
Display settings for
channels 16-30
Execute burn out detection
Select for automatic burn out detection
Burn out detection indicator
Click to release alarm occurrence status indication hold
Other Settings
Select to use the moving average as the measured values
Select the measurement channel
Set the number of samples for the moving average
Select to calculate the difference from the reference channel
Select to use the NULL value
Set alarm detection by group
Toggle the reference junction compensation (RJC)
between Internal and External
Input the reference junction temperature for
external reference junction compensation (RJC)
IM 707231-01E
Select the units of temperature
Select the time base
Select to enable fast scan mode
Set alarms for the measurement channels
1-3
1.2 Operation Panel
Table Entry W indow
Select the Label
Select the measurement function
Select the type of thermocouple and resistance temperature
detector, and the measuring range
Select to use the NULL value
Select to calculate the difference from the reference channel
Select to average the measured values
Set the number of samples used for averaging
Enter the alarm output settings
Select the
reference channel
Select to enable fast scan mode
Select to hide alarm output and reference channel settings
Paste settings
Copy settings
Select items to be copied
Displaying Alarm Status and Burn out by Channel
Select groups for alarm status display or burn out
Grey indicator: channels in the measured group currently not being measured
Black indicator: channels not set to output alarms
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.
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.
1-4
IM 707231-01E
1.3 Setting Measurement Conditions
Selecting the Measurement Function
Choose from TC (thermocouple), DCV (DC voltage), RTD (resistance temperature
detector), and OHM (resistance). RTD (resistance temperature detector) and OHM
(resistance) can only be selected for the odd-numbered channels between CH1 and
CH15, or the even-numbered channels between CH16 and CH30. Also, if at least one
channel among CH1-CH15 or CH16-CH30 is set to RTD (resistance temperature
detector) or OHM (resistance), measurement on the even-numbered channels from CH1
to CH15 or the odd-numbered channels from CH16 to CH30 will no longer be possible.
Hence, you will not be able to enter measurement function settings on those channels.
Selecting the T ype of Thermocouple and Resistance Temperature Detector and the Range
The following is a breakdown by measurement function of the type, range, and
measurement range that can be selected.
Thermocouple (TC)
Type Measurement Range Resolution
K –200.0 to 1300.0°C 0.1°C
E –200.0 to 800.0°C 0.1°C
J –200.0 to 1100.0°C 0.1°C
T –200.0 to 400.0°C 0.1°C
1
Functions
NULL
IM 707231-01E
Resistance Temperature Detector (RTD)
Type Measurement Range Resolution*
Pt100 –200.0 to 650.0°C 0.01°C (0.1°C)
* The resolution in parentheses is for an integral time of 1 ms or 4 ms.
DC Voltage Input (DCV)
Range Measurement Range Resolution*
20 mV ±19.9999 mV 100 nV (1 µV)
200 mV ±199.999 mV 1 µV (10 µV)
2 V ±1.99999 V 10 µV (10 µV)
20 V ±19.9999 V 100 µV (1 mV)
*The resolution in parentheses is for an integral time of 1 ms or 4 ms.
Resistance (OHM)
Range Measurement Range Resolution*
20 OHM 0.0 to 19.9999 Ω 100 µΩ (1mΩ)
200 OHM 0.0 to 199.9999 Ω 1 µΩ (10 mΩ)
2 kOHM 0.0 to 1.99999 Ω 10 mΩ (100 mΩ)
20 kOHM 0.0 to 19.99999 kΩ 100 mΩ (1 Ω)
200 kOHM 0.0 to 199.99999 kΩ 1Ω (10 Ω)
2 MOHM 0.0 to 1.9999 MΩ 10 Ω (100Ω)
*The resolution in parentheses is for an integral time of 1 ms or 4 ms.
For each channel, you can set whether the null value is applied to measurement values.
When the NULL check box is selected, the measured value is equal to the actual value
minus the null value. Using the NULL value, the residual voltage can be cancelled, for
example when measuring in microvolts.
If the NULL check box is selected during measurement, the value measured immediately
thereafter is used as the null value. If the NULL check box is selected while
measurement is stopped, the value measured immediately after measurement starts is
used as the null value.
If you click the NULL Meas button, the null values of the channels whose NULL check
boxes are selected are measured again.
1-5
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