Yokogawa Yokogawa CA71 Manual

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User’s Manual

IM CA71-E

Model CA51, CA71 HANDY CAL (Calibrator)

5 Commonwealth Ave Woburn, MA 01801 Phone 781-665-1400

Free 1-800-517-8431

Toll

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Store this manual in an easily accessible place for quick reference.

10th Edition: Nov. 2018 (YMI)

IM CA71-E

Introduction

Thank you for purchasing the CA51/CA71 HANDY CAL Calibrator. This User’s Manual explains the functions of the CA51 and CA71, as well as the operating methods and handling precautions. Before using this product, thoroughly read this manual to understand how to use it properly.

■ List of Manuals

The following manuals, including this one, are provided as manuals for the CA51 and CA71. Please read all manuals.

Manual No. Description

IM CA71-E User's Manual (this manual) IM CA71-93Z2 Document for Korea

Contact information of Yokogawa ofces worldwide is provided on

the following sheet.

Document No. Description

PIM 113-01Z2 Inquiries List of worldwide contacts

10th Edition: November 2018 (YMI) All Rights Reserved. Copyright © 2002, Yokogawa M&C Corporation, 2014, Yokogawa Meters & Instruments Corporation, 2017, Yokogawa Test & Measurement Corporation Printed in Japan

IM CA71-E

Introduction

■ Notes

● This manual exclusively describes the CA71, which is more

multifunctional than the CA51. The CA51 has no temperature measurement and communication functions.

● The contents of this manual are subject to change without prior

notice for reasons of improvements in performance and/or functionality.

● Every effort has been made to ensure the accuracy of this manual.

If you notice any errors or have any questions, however, please contact the vender from which you purchased the instrument.

● The content of this manual may not be transcribed or reproduced,

in part or in whole, without prior permission.

■ Trademark Acknowledgments

● All other company and product names appearing in this document

are trademarks or registered trademarks of their respective holders.

■ Revision Information

February 2002: First Edition December 2006: 2nd Edition November 2007: 3rd Edition January 2012: 4th Edition July 2014: 5th Edition April 2015: 6th Edition April 2016: 7th Edition August 2017: 8th Edition October 2017: 9th Edition November 2018: 10th Edition

IM CA71-E

Checking Items in the Package

After opening the package, check the product as follows before use. If the delivered product is the wrong model, any item is missing, or there are visible defects, contact the vendor from which you purchased the product.

Main Unit

Check the model (specications) codes in the MODEL and SUFFIX elds of the nameplate at the back of the instrument to ensure that the instrument is exactly as specied in your purchase order.

• Model Codes

Model Specication

CA51 Basic model CA71 Provided with temperature measurement and

communication functions

• NO. (Serial Number) Refer to this serial number on the nameplate when contacting the vendor about the instrument.

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iii

Checking Items in the Package

Lead cables

Lead cables for

Carrying case

Terminal adapter

Standard Accessories

Make sure that the package contains all the accessories listed below and that they are all free from any damage. Standard accessories are not covered by warranty of this instrument.

for source

(98020)

(99021)

measurement

(RD031)

AA-size (LR6)

alkaline batteries

(four units)

(93016)

User’s manual

(IM CA71-E)

Optional Accessories

The products listed below are available as optional accessories. If you purchased some of the optional accessories, make sure the delivered package is complete with the ordered items and they are free from any damage. For technical and ordering inquiries concerning the accessories, contact the vendor from which you purchased the instrument.

IM CA71-E

Accessories case

RJ sensor Communication cable

Checking Items in the Package

Product Part Number Remarks

AC adapter 94012 For 100 VAC AC adapter 94013 For 120 VAC AC adapter 94016 For 220 to 240 VAC RJ sensor B9108WA For reference junction compensation Accessories case B9108XA Communication cable (RS232)

91017 (For CA71 only)

Power cord of AC adapter: 94016-F (VDE standard), 94016-S (BS stanndard)

Make sure that the attached power cord meets the designated standards of the country and area that you are using it in.

Optional Spare Parts

Product Part Number Remarks

Lead cable for source 98020 Lead cable for measurement Carrying case 93016 Terminal adapter 99021 Used for temperature measurement Fuse --- A1635EF (1 piece)

RD031

IM CA71-E

AC adapter

Precautions for Safe Use of the Instrument

This product is designed to be used by a person with specialized knowledge.When operating the instrument, be sure to observe the cautionary notes given below to ensure correct and safe use of the instrument. If you use the instrument in any way other than as instructed in this manual, the instrument’s protective measures may be impaired. This manual is an essential part of the product; keep it a safe place for future reference. YOKOGAWA is by no means liable for any damage resulting from use of the instrument in contradiction to these cautionary notes.

The following symbols are used on the instrument and in the User’s Manual to ensure safe use.

Danger! Handle with Care. This symbol indicates that the operator must refer to an explanation in the User’s Manual in order to avoid

the risk of injury or loss of life of personnel or damage to

the instrument. This symbol indicates DC voltage/current. This symbol indicates AC voltage/current. This symbol indicates AC or DC voltage/current.

WARNING

Indicates that there is a possibility of serious personal injury or loss of life if the operating procedure is not followed correctly and describes

the precautions for avoiding such injury or loss of life.

CAUTION

Indicates that there is a possibility of serious personal injury or damage to the instrument if the operating procedure is not followed correctly and

describes the precautions for avoiding such injury or damage.

IM CA71-E

Precautions for Safe Use of the Instrument

NOTE

Draws attention to information essential for understanding the operation and features.

TIP

Provides additional information to complement the present topic.

Damage to the instrument or personal injury or even loss of life may result from electrical shock or other factors. To avoid this, follow the precautions below.

WARNING

• Use the instrument Only for Its Intended Purpose

This instrument is for generating (sourcing)/measuring voltage or current. (This instrument is for generating and measuring resistance and generating and measuring temperature using resistance or thermocouples.) Do not use this instrument for other purpose.

• Check the Physical Appearance

Do not use the instrument if there is a problem with its physical appearance.

• Use in gases

Do not operate this instrument in areas where inammable or explosive gases or vapor exists. It is extremely hazardous to use the instrument under such environments.

• Defects in protective features

Do not operate this instrument if any defect seems to exist in such protective features as fuses. Before operating the instrument, make sure the protective features are free from any defect.

• External connection

When connecting the instrument to the object under test or an external control circuit, or if you need to touch any external circuit, cut off the power to the circuit and make sure no voltage is being supplied.

• Fuses

In order to prevent a possible re, use a fuse with ratings (current, voltage, and type) specied for the instrument. Do not short-circuit the fuse holder.

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vii

Precautions for Safe Use of the Instrument

WARNING

• Correct Use of Lead Cables

Use the lead cables supplied by YOKOGAWA with this instrument. Do not use lead cables that have deteriorated or are defective. Check lead cables continuity. Correctly use the lead cables for measurement (P/N: RD031) and source (P/N: 98020) without mistaking one for the other. For high-voltage measurement, always use the lead cable for measurement.

• Damaged Signal Cable

If the signal cable (lead cables) is torn and the inner metal is exposed or if a color different from the outer sheath appears, stop using the cable immediately.

• Do Not Remove the Casing or Disassemble

Only Yokogawa service personnel are authorized to remove the casing or disassemble or modify the instrument. Do not attempt to repair the instrument yourself, as doing so is extremely dangerous. Some parts inside the instrument are extremely dangerous because they use a high voltage. When the instrument needs an internal inspection or calibration, contact YOKOGAWA or the dealer from whom you purchased the instrument.

CAUTION

This product is for domestic use (Class B) and meets the electromagnetic compatiblity requirements.

viii

IM CA71-E

Precautions for Safe Use of the Instrument

For the safe use of the optional AC adapter, follow the precautions given below.

WARNING

• Make sure that the rated power supply voltage of the instrument matches the voltage of the power supply before turning on the power.

• To prevent the possibility electrical shock or re, be sure to use the AC adapter and the power cord supplied by YOKOGAWA.

Additionally, do not use the AC adapter and the power cord supplied with

this instrument with another instrument.

• Do not place anything on the AC adapter or power cord, and prevent heat sources from coming into contact with them.

• When unplugging the power cord from the outlet, be sure to hold the plug and never pull the actual cord.

• Do not throw (dispose of ) the AC adapter in re or apply heat to it.

• Do not use it, where the cord is bundled (bent).

• If the power cord is damaged, contact your dealer.

IM CA71-E

Introduction ..........................................i

Checking Items in the Package .........................iii

Precautions for Safe Use of the Instrument ...............vi

1. Functions .......................................1-1

2. Names and Functions of Parts .....................2-1

3. Before Starting Source/Measurement................3-1

4. Source .........................................4-1

4.1 Connecting Cables to Terminals.......................4-2

4.2 Sourcing DC Voltage, DC Current or

SINK Current Signal ................................4-3

4.2.1 Sourcing DC Voltage or DC Current Signal ........4-3

4.2.2 4-20 mA Function............................4-4

4.2.3 20 mA SINK Function.........................4-5

4.2.4 Using As 24-V Loop Power Supply ..............4-6

4.3 Sourcing Resistance or RTD Signal....................4-7

4.4 Sourcing Thermocouple (TC) Signals...................4-9

4.4.1 When RJ Sensor Is Used (Making Use of Reference Junction Compensation)

4.4.2 When No RJ Sensor Is Used..................4-12

4.5 Sourcing Pulse Signals.............................4-13

4.5.1 Sourcing a Continuous Pulse Train .............4-13

4.5.2 Sourcing the Preset Number of Pulses

(Pulse Cycle)..............................4-15

4.5.3 Using the Contact Output.....................4-17

4.6 Divided Output Function (n/m) .......................4-19

4.7 Sweep Function ..................................4-20

4.8 Auto Step Function................................4-20

4.9 Temperature Monitor Function .......................4-21

...4-9

IM CA71-E

Contents

5. Measurement ....................................5-1

5.1 Connecting Cables to Terminals.......................5-2

5.2 Measuring 300 V AC-range Voltage,

DC Voltage, AC Voltage or DC Current .................5-4

5.2.1 Measuring 300 V AC-range Voltage..............5-4

5.2.2 Measuring DC or AC Voltage...................5-5

5.2.3 Measuring DC Current........................5-5

5.3 Measuring Resistance or RTD (CA71 only) Signal.........5-6

5.4 Measuring Temperature with

Thermocouple (TC) - CA71 only -......................5-7

5.5 Measuring Frequency or Pulses.......................5-8

5.5.1 Operating the Calibrator for Frequency

Measurement...............................5-8

5.5.2 Operating the Calibrator for Measuring Number of

Pulses ....................................5-8

6. Memory Functions ...............................6-1

6.1 Saving Data into Memory ............................6-2

6.1.1 Saving Data in the Order of Memory Numbers .....6-2

6.1.2

Saving Data by Selecting Desired Memory Number

6.1.3 Overwriting Data in Memory....................6-4

6.2 Reading Data from Memory . . . . . . . . . . . . . . . . . . . . . . . . . .6-5

6.3 Clearing Data in Memory ............................6-6

6.3.1 Clearing Data by Selecting Desired

Memory Number ............................6-6

6.3.2 Clearing All In-Memory Data Globally ............6-7

6.4 Sending Out Data from Memory

- CA71 only -......................................6-7

7. Functions Provided by DIP Switch ..................7-1

7.1 Sweep Function ...................................7-2

7.2 Auto Step Function.................................7-4

7.3 Selecting the INT RJ Function ........................7-6

7.4 Selecting the IPTS-68 Function .......................7-7

7.5 Switch Not Used...................................7-7

7.6 Temp Switch ......................................7-7

7.7 Selecting the Contact In Function

(Contact Input for Pulse Measurement) .................7-7

...6-4

App

IM CA71-E

Contents

8. Communication Function - CA71 only - ..............8-1

8.1 Cables Connection and Interface Specications ..........8-1

8.2 Setting the Mode...................................8-2

8.3 Types of Mode ....................................8-2

8.4 Data Format ......................................8-3

8.5 Data Structure.....................................8-3

8.6 Commands .......................................8-4

8.7 Detailed Description of Commands ....................8-5

9. Troubleshooting and Calibration....................9-1

10. Method of Calibrator Adjustment ..................10-1

10.1 Calibration Standard Selection and

Environmental Requirements ........................10-1

10.2 Adjusting Source Functions .........................10-3

10.3 Adjusting Measurement Functions ....................10-6

10.3.1 Adjusting DC Voltage and DC Current Ranges ....10-6

10.3.2 Adjusting AC Voltage and Resistance

(400 Ω) Ranges ............................10-8

10.4 Notes on the Adjustment of

Temperature Ranges - CAL71 only - ..................10-9

10.5 Post-adjustment Verication .........................10-9

11. Using Accessories ..............................11-1

12. Specications ..................................12-1

13. Sales in Each Coutry or Region....................13-1

13.1 Disposing the Product..............................13-1

13.2 How to Replace and Dispose the Batteries .............13-1

13.3 Authorized Representative in the EEA . . . . . . . . . . . . . . . . .13-2

13.4 For the Pollution Control of Electronic and Electrical Products of the People's

Republic of China .................................13-3

Appendix 1 Reference Junction Compensation .......... App1-1

xii

IM CA71-E

1. Functions

Temperature

3Wire

AC adapter

MEASURE

■ Block Diagram

SOURCE

Pulse

source

Output on/off relay

D/A

converter

Multiplying

SOURCE Mode

Section

Reference

voltage

Overcurrent

detection

Current-to-voltage

conversion

Setting

Display

RJ INPUT

Temperature

A/D

converter

CPU

sensor

Communication

cable

DIP switch

Memory

Functions

IM CA71-E

A/D

MEASURE Mode

Section

detection

circuit

Input

voltage

selector &

Constant

current

source

converter

divider

sensor

Shunt resistor

FUSE mA

DC/DC

converter

Measurement mode

on/off switch

Power

supply

circuit

Batteries

Power-on/off switch

AC100V

1-1

1. Functions

■ Main Functions

• Source

The calibrator sources a voltage, current, resistance, thermocouple (TC), RTD, frequency or pulse signal at a preset level.

Function Description

DC voltage Sources a DC voltage signal in the 100 mV, 1 V, 10 V or

30 V range. DC current Sources a DC current signal in the 20 mA range. SINK current Draws a sink current from an external power source in

the 20 mA range. Resistance Sources a resistance signal in the 400 Ω range. Thermocouple (TC) Sources a thermoelectromotive force corresponding to

the temperature detected by a type-K, E, J, T, R, B, S, N, L

or U thermocouple. RTD Sources resistance corresponding to the temperature

detected by a Pt100 or JPt100 RTD. Frequency and

pulse

*1: The thermocouples comply with the Japanese Industrial Standard

JIS C1602 (ITS-90), except for the type-L and U thermocouples that comply with DIN.

Sources a continuous pulse train with frequency in

the 500 Hz, 1 kHz or 10 kHz range.

This function also sources the preset number of pulses

dened by the frequency mentioned above.

*2: The RTD comply with the Japanese Industrial Standard JIS C1604 (ITS-90). The internal DIP switch can be congured so that the detectors comply with

IPTS-68 instead.

1-2

IM CA71-E

1. Functions

• Measurement

Independent of the source function, the calibrator measures DC voltage, AC voltage, DC current and resistance signals, a temperature signal based on a thermocouple (TC) or RTD, as well as frequency and the number of pulses.

Function Description

DC voltage Measures a DC voltage signal in the 100 mV, 1 V, 10 V or

100 V range.

AC voltage Measures a DC voltage signal in the 1 V, 10 V, 100 V or

300 V range.

DC current Measures a DC current signal in the 20 mA or 100 mA

range. The current terminals are equipped with a built-in

overrange input protection fuse. Resistance Measures a resistance signal in the 400 Ω range. Thermocouple (TC) Measures temperature according to the type of

thermocouple – K, E, J, T, R, B, S, N, L or U. RTD Measures temperature according to the type of

RTD – Pt100 or JPt100. Frequency and

pulse

Measures frequency in the 100 Hz, 1 kHz or 10 kHz range.

For pulse signals, this function measures the number of

pulses as a CPM (count per minute) or CPH (count per

hour) reading.

(CA71 only)

Functions

You can also select and congure the following functions.

Function Description

Divided output function (n/m)

Memory Stores up to 50 sourced and measured values as a set. Sweep Changes the output signal in a linear manner. Auto step Automatically changes the value of n in a setpoint × n/m

IM CA71-E

Sources a “setpoint × (n/m)” output signal,

where the variables m and n are dened as

m = 1 to 19 and n = 0 to m.

output in a step-by-step manner.

1-3

1. Functions

• Power Supply

The calibrator operates on AA-size (LR6) alkaline batteries or the optional AC adapter.

1-4

IM CA71-E

2. Names and Functions of Parts

MEASURE

SOURCE

3 4

Names and Functions of Parts

1 98 17 1521116 14

181910

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2-1

2. Names and Functions of Parts

■ Front Panel

1) POWER Key Turns on/off the power supply.

2) LIGHT Key Turns on/off the backlight of the LCD.

MEASURE Mode – Functions for Measurement

3) DC Voltage, AC Voltage, Resistance and Pulse Input Terminals Serve as H (positive) and L (negative) input terminals when you measure DC voltage, AC voltage, resistance, and pulse signals.

4) DC Current Input Terminals Serve as H (positive) and L (negative) input terminals when you measure a DC current signal. Also serve as L’ terminals when you carry out 3-wire resistance measurement.

5) Three-wire Input T erminals

6) Function Selector Switch Selects a measurement function and its range.

7) RANGE DC/AC Key Used to further select from range options within the selected function.

• If you have selected the 1 V, 10 V or 100 V range, use this key to toggle between the DC and AC options.

• If you have selected the FREQ range, use this key to select the range of frequency measurement, as the key cycles through the 100 Hz, 1 kHz, 10 kHz, CPM and CPH options.

• If you have selected the mA range, use this key to select from the 20 mA and 100 mA ranges.

• If you have selected the 100 mV TC range, use this key to select the voltage range or the type of thermocouple, as the key cycles through the 100 mV, K, E, J, T, R, B, S, N, L and U options.

(CA71 only)

• If you have selected the Ω RTD range, use this key to select the resistance range or the type of RTD, as the key cycles through

the 400 Ω, Pt100 and JPt100 options. (CA71 only)

If you have selected the TC or RTD range in the source mode of

display, the TC or RTD type options on the SOURCE function side precede those on the MEASURE mode side.

2-2

IM CA71-E

2. Names and Functions of Parts

8) MEASURE OFF Key

Turns on/off the MEASURE mode. Turning off the mode causes the measured value shown on the LCD to disappear. If the MEASURE mode is not in use and therefore turned off, the power to the measurement circuit within the calibrator is also turned off. This strategy saves on battery power if the calibrator is running on batteries.

9) HOLD Key

Holds the measured value being displayed. Also used to start CPM or CPH measurement or communication.

10) MEM Key

Used to turn on/off the memory function.

SOURCE Mode – Functions for Generation

11) Output Terminals

These terminals are common to all of the source functions.

12) Function Selector Switch

Selects a source function and its range.

13) RANGE Key

Used to further select from range options within the selected function.

• If you have selected the 100 mV TC range, use this key to select the voltage output or the type of thermocouple, as the key cycles through the 100 mV, K, E, J, T, R, B, S, N, L and U options.

• If you have selected the 400 Ω RTD range, use this key to select the resistance range or the type of RTD, as the key cycles through

the 400 Ω, Pt100 and JPt100 options.

• If you have selected the PULSE range, use this key to select the frequency range, as the key cycles through the 500.0 Hz, 1000 Hz and 10 kHz options.

14) SOURCE ON Key Turns on/off the source output.

15) PULSE SET Key If you have selected the PULSE range, use this key to cycle through the frequency, amplitude and pulse count options for pulses being generated.

Names and Functions of Parts

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2-3

2. Names and Functions of Parts

16) TEMP Key Allows you to monitor temperature by selecting from the room

temperature (°C), reference junction temperature (°C),

thermocouple (mV) and RTD (Ω) options.

17) n/m Key Turns on/off the divided output function (n/m).

and Output Setting Keys

18) Set the output value of a source function.

Each pair of

and keys corresponds to each digit of

the reading, thus increasing/decreasing the digit in units of 1s. Increasing the digit from 9 or decreasing it from 0 causes the digit to overow or underow, allowing you to set the output value without interruption.

Holding down the question.

If your choice is the 4–20 mA function, see Section 4.2, “Sourcing DC Voltage, DC Current or SINK Current Signal,” for further details.

Note that

• The

and keys are also used in the following ways:

and keys labeled n and m serve as keys for setting

the variables n and m when you have selected the divided output function (n/m). (See Section 4.6, “Divided Output Function (n/m),” for further details.)

• The and keys labeled MEM NO., SAVE and READ serve as keys for working with the memory when you have selected

the memory function.

(See Chapter 6, “Memory Function,” for further details.)

19) CLEAR Key Initializes the output setpoint, causing the on-screen reading to revert to 0000 for functions other than PULSE and 20 mA SINK, though the number of digits depends on function selected. This key serves as a key for clearing the memory when the memory function is selected.

or key continuously changes the digit in

2-4

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i jg h

2. Names and Functions of Parts

■ Side and Rear Panels

20) FUSE A holder for housing a fuse that protects the input during DC current measurement.

21) R.J.INPUT

A connector to which the external reference junction compensation

sensor is connected.

22) AC Adapter Connection Jack

23) Battery Holder Opening the cover reveals the battery holder and DIP switch.

24) I/O Port Cover Open this cover to connect the RS232 communication cable (P/N: 91017). (CA71 only)

■ LCD Unit

Names and Functions of Parts

d e

a) Measured value b) Setpoint for source c) HOLD indicator

Indicates the on-screen measured value is in a hold state.

d) Contact input

Indicates the contact input is selected when your choice is pulse measurement.

e) ON/OFF indicators for output

ON: Indicates the output is on. OFF: Indicates the output is off.

f) SWEEP indicator for sweep function

Comes on when the sweep function is selected using the DIP switch.

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2-5

2. Names and Functions of Parts

g) MEM NO. indicator

Shows a memory number when the memory function is selected.

h) AUTO STEP indicator

Comes on when the auto step function is selected.

i) Divided output function (n/m) indicator

Comes on when the divided output function (n/m) is selected.

The most signicant two digits “18” denote the value of n, while the least signicant two digits “88” mean the value of m.

j) CAL mode selection indicator

The 0 and FS indicators below this indicator denote zero point and

full scale adjustments, respectively.

k) Battery replacement indicator (Remaining battery power indicator)

Shows the battery level in three steps according to the level of remaining electricity.

l) RJON indicator

Indicates reference junction compensation is active when

thermoelectromotive force is being sourced. The thermoelectromotive force output when this indicator is off represents the 0°C-based output.

2-6

IM CA71-E

3. Before Starting Source/Measurement

■ Operating Precautions

Precautions for Safe Use of the Instrument

● When using the instrument for the rst time, be sure to read the instructions given on pages vi to ix of the section, “Precautions for Safe Use of the Instrument.”

● Do not open the instrument’s case.

Opening the case is extremely hazardous, as the instrument contains high-voltage parts. Contact the vendor from which you purchased the instrument, for a service of inspecting or adjusting the internal assembly.

● In case of failure

Should the instrument begin to emit smoke, give off an unusual odor, or show any other anomaly, immediately turn off the POWER key. If you are using an AC adapter, disconnect the plug from the wall outlet. Also cut off power to the object under test that is connected to the input terminals. Then, contact the vendor from which you purchased the instrument.

General Handling Precautions

● Before carrying around the instrument turn off power to the object under test, and then the POWER key of the instrument. If you are using an AC adapter, disconnect the power cord from the wall outlet. Finally, detach all lead cables from the instrument. Use a dedicated carry case when transporting the instrument.

● Do not bring any electried object close to the input terminals, since the internal circuit may be destroyed.

● Do not apply any volatile chemical to the instrument’s case or operation panel. Do not leave the instrument in contact with any product made of rubber or vinyl for a prolonged period.

Be careful not to let a soldering iron or any other heat-emitting object

come into contact with the operation panel, as the panel is made of thermoplastic resin.

● Before cleaning the instrument’s case or operation panel disconnect the power cord plug from the wall outlet if you are using an AC adapter. Use a soft, clean cloth soaked in water and tightly squeezed to gently wipe the outer surfaces of the instrument. Ingress of water into the instrument can result in malfunction.

Before Starting Source/Measurement

IM CA71-E

3-1

3. Before Starting Source/Measurement

● If you are using an AC adapter with the instrument and will not use the instrument for a prolonged period, disconnect the power cord plug from the wall outlet.

● For handling precautions regarding the batteries, see “Installing or

Replacing the Batteries” on page 3-3.

● Never use the instrument with the cover of the battery holder opened.

Operating Environment and Conditions

This instrument complies with the EMC standard under specic

operating environment and operating conditions. If the installation, wiring, and so on are not appropriate, the compliance conditions of the EMC standard may not be met. In such cases, the user will be required to take appropriate measures.

■ Environmental Requirements

Use the instrument in locations that meet the following environmental requirements:

• Ambient temperature and humidity Ambient temperature range: 0 to 50°C Ambient humidity range: 20 to 80% RH. Use the instrument under non-condensing condition.

• Flat and level locations

• Indoors

• Operating altitude: 2000 m or less

3-2

Do not use the instrument in locations that are:

• Outdoors

• exposed to direct sunlight or close to any heat source;

• exposed to water or other liquids;

• exposed to frequent mechanical vibration;

• close to any noise source, such as high-voltage equipment or motive power sources;

• close to any source of intensive electric or electromagnetic elds;

• exposed to large amounts of greasy fumes, hot steam, dust or corrosive gases;

• unstable; or

• exposed to a risk of explosion due to the presence of ammable

gases.

IM CA71-E

3. Before Starting Source/Measurement

NOTE

• Use the instrument under the following environmental conditions if precise source or measurement is your requirement:

Ambient temperature range: 23±5°C; ambient humidity range: 20 to 80% RH

(non-condensing)

When using the instrument within a temperature range of 0 to 18°C or

28 to 50°C, add a value based on the temperature coefcient shown in

Chapter 12, “Specications (page 12-1),” to the given accuracy rating.

• When using the instrument at an ambient humidity of 30% or lower, prevent electrostatic charges from being produced, by using an antistatic mat or any other alternative means.

• Condensation may occur if you relocate the instrument from places with low temperature and humidity to places with high temperature and humidity, or if the instrument experiences any sudden temperature change.

In that case, leave the instrument under the given ambient temperature for

at least one hour to ensure that the instrument is free from condensation, before using the instrument.

■ Installing or Replacing the Batteries

WARNING

Before Starting Source/Measurement

To avoid electrical shock, always remove the source or measurement lead

cables from the object under test, as well as from the instrument itself.

CAUTION

• To avoid the risk of uid leakage or battery explosion, install batteries with

their positive and negative electrodes correctly positioned.

• Do not short-circuit the batteries.

• Do not disassemble or heat the batteries or throw them into re.

• When replacing batteries, replace all of the four batteries at the same time with new ones from the same manufacturer.

• If the instrument will not be used for a prolonged period, remove the batteries from the instrument.

IM CA71-E

3-3

3. Before Starting Source/Measurement

Step 1: Remove the lead cables and AC adapter and turn off

the calibrator before you begin installing batteries.

Step 2: Remove the battery holder cover by sliding it in the direction

indicated by → OPEN.

Step 3: Install four AA-size (LR6) alkaline batteries in the battery

holder with their positive and negative electrodes positioned correctly as indicated on the holder.

Step 4: After replacement, reattach the battery holder cover tightly.

OPEN

3-4

Indication of Battery Level (Remaining Battery Power Indicator)

The battery replacement indicator shows the battery level in three steps according to the measured voltage of the batteries.

(Lit constantly): The battery level is normal. (Lit constantly): The battery level is below 50% full,

but still allows for normal operation.

(ashing): replace the batteries.

IM CA71-E

3. Before Starting Source/Measurement

Note that the battery replacement (remaining battery power) indicator is driven by directly measuring the battery voltage when the calibrator is in actual operation. Consequently, the indicator may read differently depending on the battery load condition (e.g., the load condition of the source output or on/off state of the measurement function) if the batteries are too low. If the remaining power starts to run low, replace the batteries as soon as possible.

If the calibrator will be used under a wide variety of conditions, it is advisable that the battery replacement indicator be veried under heavy loads (MEASURE mode is on and the SOURCE mode is set to the 20 mA/10 V output).

■ Connecting the AC Adapter

WARNING

• Make sure that the rated power supply voltage of the instrument matches the voltage of the power supply before turning on the power.

• To prevent the possibility electrical shock or re, be sure to use

the AC adapter and the power cord supplied by YOKOGAWA. Additionally, do not use the AC adapter and the power cord supplied with this instrument with another instrument.

• Do not place anything on the AC adapter or power cord, and prevent heat sources from coming into contact with them.

• When unplugging the power cord from the outlet, be sure to hold the plug and never pull the actual cord.

• Do not throw (dispose of ) the AC adapter in re or apply heat to it.

• Do not use it, where the cord is bundled (bent).

• If the power cord is damaged, contact your dealer.

Before Starting Source/Measurement

Step 1: Make sure the calibrator is turned off. Step 2: Insert the plug of the optional AC adapter into the AC adapter

connection jack.

IM CA71-E

3-5

3. Before Starting Source/Measurement

■ Turning On/Off the Power

CAUTION

To verify the instrument's functionality, check that the measured value is updated after turning on the power. If the measured value is not updated, the reading will be incorrect and may lead to possible electrical shock or

personal injury.

Turning On/Off the POWER Switch

Pressing the Pressing the

key once when the power is off turns on the calibrator. key once again turns off the calibrator.

NOTE

• Before disconnecting the AC adapter from an AC power source, turn off the calibrator by pressing the

• When operating the calibrator on batteries, disconnect the AC adapter plug from the instrument.

Once you connect the AC adapter plug to the instrument, the instrument no

longer operates on batteries.

Thus, the instrument will not turn on unless the AC adapter is connected

to an AC power source.

• Be sure to turn off the POWER switch when you nish using the instrument.

key.

3-6

IM CA71-E

3. Before Starting Source/Measurement

Turning On/Off MEASURE Mode

Pressing the mode.

• If the MEASURE mode is not needed and therefore turned off, power to the measurement circuit is also turned off within the calibrator.

Thus, you can save on battery power if the calibrator is running on

batteries.

• Turning off the MEASURE mode causes the on-screen measured value to disappear.

• To resume measurement when the MEASURE mode is off, press the

TIP

One to two seconds are taken for the LCD to turn on after the MEASURE mode is turned on.

key after power-on turns off the MEASURE

key once again.

■ Turning On/Off the Backlight

The LCD can be back-lit. Pressing the key turns on the backlight, while pressing the key once again turns it off.

This feature makes it easier for you to view the LCD when operating the calibrator in dark places or when carrying out source or measurement. Note that battery life shortens when the calibrator is operated on batteries.

Before Starting Source/Measurement

NOTE

The backlight automatically turns off approximately one minute later. To turn on the backlight again, press the

key once again.

IM CA71-E

3-7

3. Before Starting Source/Measurement

■ Operating Environment

Operating Environment

Ambient Temperature and Humidity

Use the CA51/71 in the following environment:

• Ambient temperature: 0 to 50°C

• Ambient humidity: 20 to 80 % RH (no condensation)

• Location: indoors

• Operating altitude: 2000 m max. above sea level.

■ Measurement Category

Measurement Category of Main unit

WARNING

The instrument is designed for measurement category III. Do not use the CA51 or CA71 for measurements in location that fall under Measurement Category IV.

Measurement Category

O (None, Other)

CAT II

CAT III

CAT IV

Description Remarks

Other circuits that are not directly connected to MEAINS. For measurement preformed on circuits directly connected to a low-voltage installation. For measurement preformed in a building installation. For measurement preformed at the source of a low-voltage installation.

Circuits not connected to a mains power source. Appliances, portable equipment, etc.

Distribution board, circuit breaker, etc. Overhead wire, cable systems, etc.

Category of Lead cables (RD031)

WARNING

When you use the lead cables, attache or remove the caps according to the measurement category.

With caps: 1000V 10A CAT III / 600V 10A CAT IV With no caps: 1000V 10A CAT II

3-8

IM CA71-E

3. Before Starting Source/Measurement

Pollution Degree

The pollution degree of the CA51 or CA71 in the operating environment is 2. Pollution Degree applies to the degree of adhesion of a solid, liquid, or gas which deteriorates withstand voltage or surface resistivity. Pollution Degree 2 applies to normal indoor atmospheres. Normally, only non-conductive pollution is emitted. However, a temporary electrical conduction may occur depending on the concentration.

Before Starting Source/Measurement

IM CA71-E

3-9

4. Source

From the calibrator, you can source a DC voltage, DC current, SINK current, resistance, thermocouple, RTD, frequency or pulse signal.

WARNING

• To avoid electrical shock, do not apply any voltage above 30 V to the output terminals.

Always use the calibrator in locations with a voltage to ground below 30 V.

CAUTION

• Do not apply any voltage to the output terminals for ranges other than 20 mA SINK. Otherwise, the internal circuitry may be damaged.

• The instrument has been calibrated without taking into account a voltage drop due to the resistance component of the lead cables for source.

Care must be taken therefore when drawing a load current since

the voltage drop due to the resistance component (approximately 0.1 Ω on a round-trip basis) of the lead cables serves as an error.

Source

IM CA71-E

4-1

4.1 Connecting Cables to Terminals

Lead cables for

Black BlackRed

4.1 Connecting Cables to Terminals

CAUTION

Tighten the output terminal knob by hand. Do not use a tool or the like. Tightening the knob using a tool or the like maydamage the terminal, resulting in the disability of normal generation. Before storing the instrument in the carrying case, tighten the output terminal knob. If the instrument is stored in the carrying case while the output terminal knob is not tightened completely and is protruding, an external force may be applied to the terminal, thus causing damage to the terminal and resulting in the disability of generation.

source (98020)

4-2

For DC voltage, DC current, thermocouple or pulse output

Step 1: Connect the red lead cable for source (P/N: 98020) to

the H output terminal and the black lead cable to the L output terminal.

Step 2: Connect the two clips of the cables to the input of equipment

under test while making sure the polarities are correct.

For 3-wire connection resistance or RTD signal

Step 1: Connect the red lead cable for source (P/N: 98020) to the H

output terminal, and both black lead cables to the L output terminal. (The two black lead cables should be fastened together to the L output terminals.)

Step 2: Connect the three leading clips of the cables to the input of

equipment under test while making sure the polarities are correct.

IM CA71-E

4.2 Sourcing DC Voltage, DC Current or SINK Current Signal

4.2 Sourcing DC Voltage, DC Current or

SINK Current Signal

4.2.1 Sourcing DC Voltage or DC Current Signal

Step 1: Using the Function selector switch, select the desired source

function from

Step 2: The LCD shows the default value and unit of the source

function.

Step 3: Set the output value digit by digit using each pair of

and output setting keys.

Each pair of

the LCD reading.

Each press of the

the digit.

Increasing the digit from 9 or decreasing it from 0 causes

the digit to overow or underow, allowing you to set the output value without interruption.

Holding down the

the digit in question.

Pressing the

the default value (0).

100mV TC , 1V , 10V

and keys corresponds to each digit of

and key increases or decreases

or key continuously changes

key initializes the output setpoint to

30V

and

20mA

Source

Step 4: Pressing the

the LCD to change from

The calibrator sources the preset DC voltage or current signal

between the output terminals.

Step 5: To turn off the output, press the The appears on the LCD and the output terminals are

open-circuited.

key causes the indicator on

to .

key once again.

IM CA71-E

4-3

4.2 Sourcing DC Voltage, DC Current or SINK Current Signal

TIP

If either of the following cases applies, the protection circuit works to turn off the output.

• The output terminals or the lead cables for source connected to the output

terminals are short-circuited or an excessive load current has owed

through the cables when a voltage is being output.

• The output terminals or the lead cables for source connected to the output terminals are open-circuited or an excessive load voltage has been sourced between the output terminals when a current is being output.

4.2.2 4-20 mA Function

You can set a 4-20 mA signal in 4 mA increments.

Step 1: Using the function selector switch, select Step 2: Using each pair of

and output setting keys,

4-20mA

which correspond to each digit of a value from 4 to 20, set the signal in a step-by-step manner. You can set the signal in 4 mA increments or decrements in

the order 4 ↔ 8 ↔ 12 ↔ 16 ↔ 18 ↔ 20 mA.

Use the pairs of

and keys for the decimals to make

ne adjustments, as the keys let you set the decimals in

normal resolution. Pressing the

key initializes the signal setpoint to

the default value (4.00).

Step 3: Pressing the

the LCD to change from

key causes the indicator on

to . The calibrator sources the preset 4-20 mA current signal between the output terminals.

Step 4: To turn off the output, press the

The

appears on the LCD and the output terminals are

key once again.

open-circuited.

TIP

If the signal setpoint is 3 mA or less, no step-by-step setting is possible even if you operate the higher-order output setting keys.

4-4

IM CA71-E

4.2 Sourcing DC Voltage, DC Current or SINK Current Signal

1-5 V output

Drawing SINK Current

4.2.3 20 mA SINK Function

The 20 mA SINK function can draw a preset amount of current from an external voltage source to the H terminal. Thus, you can use the calibrator in a loop test, for example, as a simulator for two-wire transmitters. In that case, use this function within the 5 to 28 V range of applied voltages. The minimum value of the range for the 20 mA SINK function is 0.1 mA. You can test the I/O signals of a distributor by wiring the calibrator as

indicated by the dashed lines in the following gure.

24 V DC

4-20 mA

H L mA H L

MEASURE

SOURCE

CA71

Source

Distributor

AC or DC power supply

IM CA71-E

Step 1: Before connecting to the terminals,

select

Step 2: Connect the positive terminal of an external power source

to the H output terminal and the negative terminal to the L output terminal.

Step 3: Turn on the external power source and press the

The The calibrator sources the preset current value of

the 20 mA SINK function between the output terminals.

Step 4: To turn off the output, press the The

open-circuited.

with the source range setting rotary switch.

key.

indicator on the LCD changes from to .

key once again.

appears on the LCD and the output terminals are

4-5

24 V

Input

Using As a Loop Power Supply

4.2 Sourcing DC Voltage, DC Current or SINK Current Signal

4.2.4 Using As 24-V Loop Power Supply

A maximum load current of 22 mA can be drawn from the calibrator by selecting the 30 V range and setting the sourced voltage to 24 V. With this function, you can use the calibrator as a loop power supply in place of the distributor in a two-wire loop, as shown in the following

gure. Thus, you can measure a 4-20 mA current signal.

Using the supplied terminal adapter (P/N: 99021) makes it easy to wire the calibrator for this application.

NOTE

Since the function discussed above requires a signicant amount of DC current (22 mA), operation on batteries will reduce the battery life considerably.

To avoid this problem, operate the calibrator on the AC adapter. In this application, no source output other than 24 V can be taken at

the same time.

Two-wire transmitter

4-20 mA

L mA H L

MEASURE SOURCE

24 V output

CA71

AC adapter

4-6

IM CA71-E

4.3 Sourcing Resistance or RTD Signal

• The calibrator sources a resistance signal by 1) receiving the resistance-measuring current I supplied from the device being calibrated, such as a resistance meter or RTD thermometer, and 2) delivering the voltage V = R × I proportional to the preset resistance R between the output terminals, and 3) thus producing the equivalent resistance R = V/I. Consequently, the calibrator sources the signal correctly only for such devices that employ this method of measurement.

• The allowable range of the resistance measuring current I that the calibrator receives from a resistance measuring device under calibration is rated as 0.1 to 5 mA. Note, however, that accuracy lowers for resistance measuring currents smaller than 0.5 mA.

For further details, see Chapter 12, “Specications.”

• Any resistance signal being sourced does not include the resistance component of the lead cables for source.

The calibrator is adjusted so that the signal has a resistance value as

viewed from the output terminals.

The whole resistance, when measured at the ends of the lead cables

for source, is given by adding the resistance of the lead cables

themselves (approximately 0.1 Ω on a round-trip basis) to the sourced

resistance signal.

For source of precise resistance signals, use three-wire connection.

• If capacitance between the terminals of a device under calibration is greater than 0.1 µF, the calibrator may fail to source correct resistance signals.

Source

IM CA71-E

4-7

Three-wire Connection for Resistance Signal Source

4.3 Sourcing Resistance or RTD Signal

■ Output Method Based on Three-wire Connection

Attach another lead cable to the L output terminal, as shown in the following gure. The output is provided through the three wires, H, L and L’. Connect these three wires to the device being calibrated.

SOURCE Three-wire measuring equipment

CA71

H L L'

Step 1: Using the function selector switch, select Step 2: Using the

Pressing the

key, select the range.

key cycles through the 400 Ω,

400Ω RTD

PT100 and JPT100 options.

Step 3: Set the output value digit by digit using each pair of

and keys.

Each press of the

or key increases or decreases

the digit.

Increasing the digit from 9 or decreasing it from 0 causes

the digit to overow or underow, allowing you to set the output value without interruption.

Holding down the

or key continuously changes

the digit in question.

Pressing the

key initializes the output setpoint to

the default value (0).

Step 4: Pressing the

the LCD to change from

key causes the indicator on

to .

The calibrator sources the preset resistance value between

the output terminals.

Step 5: To turn off the output, press the The

appears on the LCD and the output terminals are

key once again.

open-circuited.

4-8

IM CA71-E

4.4 Sourcing Thermocouple (TC) Signals

4.4.1 When RJ Sensor Is Used

(Making Use of Reference Junction Compensation)

To calibrate a device with built-in reference junction temperature

compensation by sourcing a thermoelectromotive force with

the calibrator without using any external 0°C reference junction

compensation means, use the optional RJ sensor (P/N: B9108WA).

CAUTION

When sourcing thermocouple signals, the CA71 outputs a small DC voltage. If the device under calibration has a switching power supply, its switching noise may affect the CA71 output. Taking measures such as connecting the device to ground can reduce its noise, resulting in less effect on the CA71. (This caution also applies to the CA51.)

Step 1: Insert the RJ sensor into the R.J.INPUT connector of

the calibrator.

Insert the sensor until the locking claw in the bottom of

the sensor connector locks with a click.

To unplug the sensor connector, unlock the connector by

gently pushing the locking claw.

Step 2: Using the function selector switch, select Step 3: Using the

Select the type from K, J, E, T, R, B, S, N, L and U. The selected type of thermocouple is shown on the LCD.

Step 4: When the RJ sensor is connected, the calibrator goes into

the RJ ON status and the RJON symbol appears on the LCD.

key, select the type of thermocouple.

100mV TC

Source

IM CA71-E

4-9

4.4 Sourcing Thermocouple (TC) Signals

Step 5: Set the output value digit by digit using each pair of

and output setting keys.

Each pair of

and keys corresponds to each digit of

the LCD reading.

Each press of the

digit.

Increasing the digit from 9 or decreasing it from 0 causes

the digit to overow or underow, allowing you to set the output value without interruption.

Holding down the

the digit in question.

Pressing the

key initializes the output setpoint to

the default value (600°C for a type-B thermocouple).

or key increases or decreases the

or key continuously changes

Step 6: Pressing the

the LCD to change from

key causes the indicator on

to .

A thermoelectromotive force based on the temperature

detected by the RJ sensor develops between the output terminals.

Step 7: To turn off the output, press the

key once again.

The appears on the LCD and the output terminals are

open-circuited.

NOTE

• When you have attached the RJ sensor to the device being calibrated, wait until the detected temperature stabilizes before you begin using the calibrator.

• If no reference junction compensation is required, be sure to remove the RJ sensor from the calibrator.

4-10

IM CA71-E

4.4 Sourcing Thermocouple (TC) Signals

TIP

The calibrator has a built-in RJ sensor (INT RJ) that compensates

for the measured reference junction temperature.

You can generate thermoelectromotive force that is based on the measured temperature from the calibrator's output terminal and roughly check

the measurement (reading) on the thermometer under verication.

Because the thermoelectromotive force generated using this method does not match that generated using an external RJ sensor,* the accuracy of this measurement is not guaranteed.

For further details on how to use the temperature sensor, see Section 7.3, “Selecting the INT RJ Function.”

* The terminal temperature of the thermometer under verication is

measured using an external RJ sensor, and this temperature is used

as the reference junction temperature.

Source

IM CA71-E

4-11

4.4 Sourcing Thermocouple (TC) Signals

4.4.2 When No RJ Sensor Is Used

From the output terminals, the calibrator sources a thermoelectromotive force corresponding to the preset temperature of a selected thermocouple. The thermoelectromotive force is sourced with reference to 0°C.

Step 1: Using the function selector switch, select Step 2: Using the

Select the type from K, J, E, T, R, B, S, N, L and U. The selected type of thermocouple is shown on the LCD.

Step 3: Set the output value digit by digit using each pair of

and output setting keys.

Each pair of

the LCD reading.

Each press of the

the digit.

Increasing the digit from 9 or decreasing it from 0 causes

the digit to overow or underow, allowing you to set the output value without interruption.

Holding down the

the digit in question.

Pressing the

the default value (600°C for a type-B thermocouple).

Step 4: Pressing the

the LCD to change from

A thermoelectromotive force (mV) equivalent to the preset

temperature develops between the output terminals.

Step 5: To turn off the output, press the The

open-circuited.

key, select the type of thermocouple.

and keys corresponds to each digit of

or key increases or decreases

or key continuously changes

key initializes the output setpoint to

key causes the indicator on

to .

appears on the LCD and the output terminals are

100mV TC

key once again.

4-12

IM CA71-E

4.5 Sourcing Pulse Signals

Source of number of pulses

n = Preset number

Amplitude setpoint

Providing Pulse Output

You can source a preset type of continuous pulse train, a pulse signal with a preset frequency, or the preset number of pulses.

4.5 Sourcing Pulse Signals

Frequency-based signal

OFF ON 1 2 3 n

Press key

Automatically turned off

4.5.1 Sourcing a Continuous Pulse Train

Step 1: Using the function selector switch, select

The LCD shows the default frequency

IM CA71-E

Step 2: Using the

Pressing of the

1000 Hz and 10 kHz options.

Step 3: Set the output value digit by digit using each pair of

and output setting keys.

Each pair of

the LCD reading.

Each press of the

the digit.

Increasing the digit from 9 or decreasing it from 0 causes

the digit to overow or underow, allowing you to set the output value without interruption.

Holding down the

the digit in question.

Pressing the

the default value (differs depending on the frequency range).

Step 4: Pressing the

mode.

The LCD provides a reading of

key, set the frequency range.

key cycles through the 500.0 Hz,

and keys corresponds to each digit of

or key increases or decreases

or key continuously changes

key initializes the output setpoint to

key once switches to amplitude setting

Continued

of pulses

PULSE

Source

4-13

4.5 Sourcing Pulse Signals

Step 5: Set the output value digit by digit using each pair of

and output setting keys.

Each pair of

the LCD reading.

Each press of the

the digit.

Increasing the digit from 9 or decreasing it from 0 causes

the digit to overow or underow, allowing you to set the output value without interruption.

Holding down the

the digit in question.

Pressing the

the default value (0.1 V).

and keys corresponds to each digit of

or key increases or decreases

or key continuously changes

key initializes the output setpoint to

Step 6: Press the Then, press the

key once again to show on the LCD.

key one more time to revert to

frequency setting mode.

Step 7: Pressing the

to change from

key causes the indicator on the LCD

to .

The calibrator sources a continuous pulse train with

the preset frequency and amplitude between the output terminals.

Step 8: To turn off the output, press the The

symbol appears on the LCD and the output terminals

key once again.

are open-circuited.

TIP

To change the frequency range, place the calibrator in frequency setting mode with the

Then, change the frequency range using the

key.

4-14

IM CA71-E

4.5 Sourcing Pulse Signals

4.5.2 Sourcing the Preset Number of Pulses

(Pulse Cycle)

Step 1: Using the function selector switch, select

The LCD shows the default frequency

Step 2: Using the

Each press of the

1000 Hz and 10 kHz options.

Step 3: Set the output value digit by digit using each pair of

and output setting keys.

Each pair of

the LCD reading.

Each press of the

the digit.

Increasing the digit from 9 or decreasing it from 0 causes

the digit to overow or underow, allowing you to set the output value without interruption.

Holding down the

the digit in question.

Pressing the

the default value (differs depending on the frequency range).

Step 4: Pressing the

mode.

The LCD provides a reading of Step 5: Set the output value digit by digit using each pair of

and output setting keys.

Each pair of

the LCD reading.

Each press of the

the digit.

Increasing the digit from 9 or decreasing it from 0 causes

the digit to overow or underow, allowing you to set

Holding down the

Pressing the

the output value without interruption.

the digit in question.

the default value (0.1 V).

key, set the frequency range.

key cycles through the 500.0 Hz,

and keys corresponds to each digit of

or key increases or decreases

or key continuously changes

key initializes the output setpoint to

key once switches to amplitude setting

and keys corresponds to each digit of

or key increases or decreases

or key continuously changes

key initializes the output setpoint to

PULSE

Source

IM CA71-E

4-15

4.5 Sourcing Pulse Signals

Step 6: Press the Then, press the

key once again to show on the LCD.

key.

The source setpoint reading of the LCD changes to a numeric

value, which represents the number of pulses.

Step 7: Set the number of pulses value digit by digit using each pair

and output setting keys.

Each press of the

or key increases or decreases

the digit.

Increasing the digit from 9 or decreasing it from 0 causes

the digit to overow or underow, allowing you to set the output value without interruption.

Holding down the

or key continuously changes

the digit in question.

Pressing the

the default (

key initializes the output setpoint to

), thus reverting to the mode of sourcing

continuous pulse trains.

Step 8: Pressing the

key causes the indicator on

the LCD to change from to .

The calibrator sources the preset number of pulses with

the preset frequency and amplitude between the output terminals.

Step 9: When source is complete, the calibrator automatically

turns off the output and ceases operation.

The

appears on the LCD and the output terminals are

open-circuited.

TIP

To stop sourcing pulses halfway, press the key when pulse output is in progress.

The

appears on the LCD and the output terminals are open-circuited.

4-16

IM CA71-E

4.5.3 Using the Contact Output

You can turn on or off the output terminals. This setting is possible for both the mode of sourcing a continuous pulse train and the mode of sourcing a given number of pulses. An FET is used as the contact switching device. Since the way of using the contact output is the same for both the source of continuous pulse trains and the source of a number of pulses, this subsection only refers to the procedure for continuous pulse trains.

Step 1: Using the function selector switch, select The LCD shows the default frequency

4.5 Sourcing Pulse Signals

PULSE

Source

Step 2: Using the

Each press of the

1000 Hz and 10 kHz options.

Step 3: Set the output value digit by digit using each pair of

and output setting keys.

Each pair of

the LCD reading.

Each press of the

digit.

Increasing the digit from 9 or decreasing it from 0 causes

the digit to overow or underow, allowing you to set the output value without interruption.

Holding down the

the digit in question.

Pressing the

the default value (differs depending on the frequency range).

Step 4: Pressing the

mode.

The LCD provides a reading of

Step 5: Changing the reading of to with the key causes

Step 6: Press the

Then, press the

the calibrator to enter contact output mode.

frequency setting mode.

key, set the frequency range.

key cycles through the 500.0 Hz,

and keys corresponds to each digit of

or key increases or decreases the

or key continuously changes

key initializes the output setpoint to

key once switches to amplitude setting

key once again to show on the LCD.

key one more time to revert to

IM CA71-E

4-17

4.5 Sourcing Pulse Signals

Step 7: Pressing the

key causes the indicator on

the LCD to change from to .

The output terminals turn on and off at the preset frequency. Step 8: To turn off the output, press the

The

appears on the LCD and the output terminals are

key once again.

open-circuited.

NOTE

• The contact has polarities. Always connect the positive side to the H output terminal of the calibrator and the negative side to the L output terminal.

• Exercise the utmost care not to allow the contact current to exceed 50 mA.

4-18

IM CA71-E

Keys and labels related to divided output function (n/m)

4.6 Divided Output Function (n/m)

The divided output function (n/m) outputs a value n/m times the setpoint of a voltage, current, resistance, thermocouple or RTD signal.

Thus, the output value is dened as:

Output value = Main setpoint × (n/m)

n m

For details on how to set the sourced signal level of each range, see Sections 4.2, “Sourcing DC Voltage, DC Current or SINK Current Signal, to 4.4, “Sourcing Thermocouple (TC) Signal.” Follow the steps shown below with the calibrator output turned off.

Source

Step 1: When the setting of the sourced signal level of each range is

complete, follow step 2 and later steps.

Step 2: Using each pair of Step 3: Press the

The LCD shows

represents the value of n and the lower-order two digits the value of m.

Step 4: Using a pair of The variable m can be set to a value from 1 to 19.

Step 5: Using a pair of An output value n/m times the main setpoint can be obtained

according to the setpoint of n.

The variable n can be set to a value from 0 to m.

key to enter the divided output (n/m) mode.

IM CA71-E

or keys, set the main setpoint.

. The higher-order two digits

or keys, set the value of m.

or keys, change the value of n.

4-19

4.7 Sweep Function

Step 6: Pressing the

the LCD to change from

The calibrator sources a (main setpoint) × (n/m) signal

between the output terminals for each range selected.

Step 7: To turn off the output, press the The

open-circuited.

Step 8: Pressing the

output (n/m) mode.

TIP

To change the main setpoint, temporarily cancel the divided output (n/m) mode.

Set the main setpoint once again. Then, place the calibrator in the divided output (n/m) mode once again.

appears on the LCD and the output terminals are

key causes the indicator on

to .

key once again.

key one more time cancels the divided

4.7 Sweep Function

The sweep function varies the output in a linear manner. For further details, see Section 7.1, “Sweep Function.”

4.8 Auto Step Function

The auto step function varies the output in a step-by-step manner. For further details, see Section 7.2, “Auto Step Function.”

4-20

IM CA71-E

4.9 Temperature Monitor Function

Using the key, you can show the monitored temperature on the LCD, as described below.

■ When the Voltage, Current, Resistance or Pulse

(Continuous Pulse Train or Number of Pulses) Range Is Selected

The reading of a sourced signal remains changed to the temperature detected by the built-in temperature sensor of the calibrator as long as the Thus, you can monitor the room’s temperature.

■ When the Temperature (Thermocouple or RTD) Range Is Selected

key is kept held down.

Source

• Pressing the

force (mV) or resistance (Ω) equivalent to the preset temperature.

The monitored value does not reect the correction made by

the RJ sensor.

• Pressing the detected by the RJ sensor connected to the calibrator or the internal temperature of the calibrator.

• Pressing the setting mode.

TIP

• In approximately 10 seconds, the temperature monitor function automatically returns to the initial normal setting mode.

• The reading of internal temperature may become higher than the room’s temperature because of a temperature rise within the calibrator.

With an external RJ sensor, it is possible to measure the room’s temperature

more precisely.

• For a reading of monitored temperature, the unit symbol (mV, Ω or °C) blinks.

Thus, you can discriminate between a setpoint and a monitored value.

key once allows you to monitor the electromotive

key once again changes to the temperature

key one more time reverts to the initial normal

IM CA71-E

4-21

5. Measurement

WARNING

● In an application where the calibrator is used together with the supplied lead cables for measurement, the maximum allowable voltage from the input terminals to ground is 300 V.

To avoid electrical shock, do NOT use the calibrator at any voltage

exceeding this maximum.

The maximum allowable terminal voltage is 300 V AC max.

● The allowable voltage to ground when the supplied terminal adapter is

attached to the input terminals is 30 Vpeak maximum.

To avoid electrical shock, do not use the terminal adapter for measuring

any circuit voltage exceeding the maximum voltage to ground.

TIP

• With the key, you can hold the measured value.

• When no measurement needs to be made, turn off the MEASURE mode by pressing the

The measured value shown on the LCD disappears and power to

the internal measuring circuit is cut off.

This strategy saves on battery power.

• The reading of a measured value is updated at approximately one-second intervals.

If the input is overranged, the measured value on the LCD reads as - - - - -.

key.

Measurement

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5-1

5.1 Connecting Cables to Terminals

■ For DC voltage, AC voltage, resistance, frequency or pulse signal

Step 1: Connect the red lead cable for measurement (P/N: RD031)

to the H input terminal and the black lead cable to the L input terminal.

Step 2: Connect the two clips of the cables to the measuring

terminals of equipment under test while making sure the polarities are correct.

■ For DC current signal

Step 1: Connect the red lead cable for measurement (P/N: RD031)

to the mA input terminal and the black lead cable to the L input terminal.

Step 2: Connect the two clips of the cables to the measuring

terminals of equipment under test while making sure the polarities are correct.

■ For thermocouple signal (CA71 only)

Step 1: Connect the terminal adapter (P/N: 99021) to the input

terminals. This will help you connect the cables easily.

5-2

Step 2: Connect between TC RTD terminals. The positive output leadwire of the thermocouple to the H

terminal of the terminal adapter and the negative output leadwire to the L terminal.

■ For RTD signal (CA71 only)

Step 1: When using the terminal adapter (P/N: 99021), connect

the H, L and L terminals of the terminal adapter to the H, L and mA terminals of the three-wire input terminal block of the calibrator, respectively.

Step 2: Connect the A, B and B output leadwires of the RTD to

the H, L and L terminals of the terminal adapter, respectively.

IM CA71-E

5.1 Connecting Cables to Terminals

CAUTION

• Before connecting the calibrator to the device under test, cut off the power to the device.

• Do not apply any voltage or current exceeding the allowable voltage (300 V) or current (120 mA).

Otherwise, there will be a danger of not only damage to the instrument

but also personal injury due to electrical shock.

• Mistaking the H voltage input terminal for the mA current input terminal, and vice versa, when wiring is extremely dangerous.

NEVER make this mistake.

• The current input terminals are equipped with a built-in current input protection fuse.

Overcurrent input to the terminals will cause the fuse to blow. If the fuse is blown, replace it with one (P/N: A1635EF) with the specied

ratings. For details on fuse replacement, see subsection 5.2.3, "Measuring DC Current."

• When using the terminal adapter (model: 99021), tighten the knob by hand.

Do not use a tool or the like. Tightening the knob using a tool or the like may damage the terminal,

resulting in the disability of measurement.

Before storing the instrument in the carrying case, remove the terminal

adapter (model: 99021).

If the instrument is stored in the carrying case while the adapter is attached,

an external force may be applied to the terminal, thus causing damage to the terminal and resulting in the disability of measurement.

Measurement

IM CA71-E

5-3

The allowable voltage to ground when the included terminal adapter is attached to the input terminals is 30 Vpeak maximum.

5.2 Measuring 300 V AC-range Voltage, DC Voltage, AC Voltage or DC Current

Terminal adapter

WARNING

(99021)

Black

Red

Lead cables for measurement (RD031)

Red

Black

5.2 Measuring 300 V AC-range Voltage,

DC Voltage, AC Voltage or DC Current

5.2.1 Measuring 300 V AC-range Voltage

CAUTION

If you make a mistake in wiring or in the operating procedure in this measurement task, there will be a danger of not only damage to

the instrument but also personal injury due to electrical shock.

Exercise the utmost care when carrying out the measurement task.

Step 1: Make sure the lead cables for measurement are not

Step 2: Using the function selector switch, select Step 3: Connect the lead cables for measurement to the measuring

5-4

connected to the measuring instrument under test.

300V

terminals of the measuring instrument under test.

IM CA71-E

5.2 Measuring 300 V AC-range Voltage, DC Voltage, AC Voltage or DC Current

5.2.2 Measuring DC or AC Voltage

Step 1: Using the function selector switch, select the measurement

function you want to use from

, , and

Step 2: Using the The DC

key, select either DC or AC.

or AC symbol appears on the LCD.

5.2.3 Measuring DC Current

Step 1: Using the function selector switch, select Step 2: Using the

The decimal point of the measured value shown on

the LCD is repositioned.

■ Replacing the Fuse

The current input protection fuse in the mA/3WIRE terminal is housed inside the fuse holder (labeled FUSE) on one side panel of the calibrator.

To replace the fuse, rst remove the fuse holder labeled FUSE by turning the holder counterclockwise with a atblade screwdriver.

Then, replace the fuse and insert the fuse holder back in place. Fasten the fuse holder by turning it clockwise. The replacement fuse is described below.

Part number Rating

A1635EF 100 mA/400 V

key, select either 20 mA or 100 mA.

Measurement

IM CA71-E

5-5

5.3 Measuring Resistance or RTD (CA71 only) Signal

Step 1: Using the function selector switch, select Step 2: Using the

Pressing the key cycles through the 400 Ω,

Pt100 and JPt100 options.

TIP

• If you select the 400 Ω RTD range of the SOURCE mode at the same time,

the RTD selected on the SOURCE mode side precedes the one selected on the MEASURE mode side.

Thus, you cannot select any RTD for the

mode. (CA71 only)

• To carry out measurement based on three-wire connection, use the 3WIRE terminal.

key, select the range.

Ω RTD

range of the MEASURE

5-6

IM CA71-E

5.4 Measuring Temperature with Thermocouple (TC) - CA71 only -

5.4 Measuring Temperature with

Thermocouple (TC) - CA71 only -

NOTE

Use the terminal adapter in locations where any voltage higher than 30 V will never be imposed on the measuring circuit.

Step 1: Using the function selector switch, select Step 2: Using the

Pressing the key cycles through the 100 mV, K, E, J, T, R,

B, S, N, L and U options.

key, select the type of thermocouple.

100mV TC

Measurement

TIP

• If you select the 100 mV TC range of the SOURCE mode at the same time, the thermocouple selected on the SOURCE mode side precedes the one selected on the MEASURE mode side.

Thus, you cannot select any thermocouple for the 100 mV TC range of

the MEASURE mode.

• If there has been a sudden change in the operating ambient temperature

of the calibrator, wait until the built-in reference junction compensation

stabilizes.

Avoid using the calibrator in locations exposed to wind from such apparatus

as an air-conditioner.

• If the thermocouple has burnt out, the LCD shows the

symbol.

IM CA71-E

5-7

5.5 Measuring Frequency or Pulses

5.5.1 Operating the Calibrator for Frequency

Measurement

Step 1: Using the function selector switch, select Step 2: Using the

Pressing the key cycles through the 100 Hz, 1000 Hz,

10 kHz, CPM and CPH options.

Note however that the range reading of the LCD is

given as shown below (when no signal is present).

key, select 100 Hz, 1000 Hz or 10 kHz.

LCD Reading

Range

100 Hz 1000 Hz

10 kHz

FREQ 30Vmax

5.5.2 Operating the Calibrator for Measuring Number of

Pulses

The CPM option in this measurement counts pulses per minute, while the CPH option counts pulses per hour.

Step 1: Using the function selector switch, select Step 2: Using the

Pressing the key cycles through the 100 Hz, 1000 Hz,

10 kHz, CPM and CPH options.

Step 3: The

a standby-for-counting state.

The calibrator begins counting pulses the moment

the

key is pressed to cancel the hold state.

key, select either CPM or CPH.

indicator turns on and the calibrator goes into

FREQ 30Vmax

5-8

IM CA71-E

5.5 Measuring Frequency or Pulses

NOTE

• If you press the key after the completion of counting while the indicator is lit, the calibrator restarts counting from 0.

• If you press the one hour) expires, the calibrator stops counting at that moment.

The LCD shows the number of pulses counted up to the moment.

• If the count exceeds the limit, the calibrator shows the maximum number and stops counting.

TIP

To measure contact input, switch to that measurement function with the DIP switch in the battery holder.

For further details, see Section 7.7, "Selecting the Contact In Function (Contact Input for Pulse Measurement)."

key halfway before the selected time (one minute or

Measurement

IM CA71-E

5-9

6. Memory Functions

Keys and labels related to memory function

The built-in memory has the following four functions. With a pair of sourced and measured signal values in a set, the calibrator can handle a maximum of 50 sets of data (hereinafter simply referred to as data) by means of its built-in memory.

1. Saving to Memory (MEM SAVE)

You can save data to memory.

2. Reading from Memory (MEM READ)

You can show data in memory on the LCD. When data is being read from memory, the source output remains turned off. Thus, you cannot do any source task using data stored in memory.

3. Clearing Memory (MEM CLEAR)

You can clear data stored in memory.

4. Sending Data from Memory - CA71 only -

You can send data in memory to an external personal computer using the communication function. This function requires use of the optional RS232 communication cable (P/N: 91017). For further details, see Chapter 8, "Communication Function."

Memory Functions

MEM No. READ

MEM

CLEAR

IM CA71-E

SAVEMEM NO.

READ

6-1

6.1 Saving Data into Memory

6.1.1 Saving Data in the Order of Memory Numbers

Step 1: Press the

The MEM No. indicator on the LCD turns on. At this point, the indicator shows a memory number

immediately following the one most recently used to save data.

Step 2: Pressing the

(currently on-display) signal values at that moment into the area with that memory number (address).

Executing the MEM SAVE function cancels the state of

selecting memory, reverting to normal setting mode.

Step 3: To save the next data item into the area with the next

memory number, press the

Now the MEM No. indicator shows a memory number one

count larger than the previous one.

Step 4: Pressing the

(currently on-display) signal values at that moment into the area with that memory number (address) – the previous memory number (address) + 1.

TIP

To cancel the memory mode (saving/reading), press the

(Executing the MEM SAVE function automatically cancels the memory mode.)

key one more time.

key.

key saves the sourced and measured

key once again.

key saves the sourced and measured

6-2

IM CA71-E

6.1 Saving Data into Memory

ndicates the memory number with which data is already saved.

(Case I)

Indication of the selection

(Case II)

Working with the MEM SAVE Function

All these are not yet used.

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 49 50

MEM No.07 Indication when selected

All these are not yet used. These are not yet used.

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 49 50

Memory Functions

Example of Key Operation

Press the key.

Press the key once again.

Press the key six times.

Press the key.

MEM No.14

Data is saved into the area with memory number 14 and the memory mode is cancelled.

MEM No.15

MEM No.21

Data is saved into the area with memory number 21 and the memory mode is cancelled.

NOTE

• In memory mode, some of the and keys change to those for working with memory. Consequently, you cannot do the regular task of setting output values for source.

• The

MEM No.

indicator begins with if no data has been saved into

memory.

If memory contains any saved data already, a memory number immediately

following the largest of the already used memory numbers is allocated to

the next data, as shown in the gure discussed above, even if there is any

not-yet-used memory address at some midpoint.

• In the case of the divided output function (n/m), the output value "setpoint × n/m" for source is stored in memory.

IM CA71-E

6-3

Alarm indication for memory overwriting

6.1 Saving Data into Memory

6.1.2 Saving Data by Selecting Desired Memory Number

Step 1: Press the The MEM No. indicator on the LCD turns on.

Step 2: Using the pair of

number (address).

Step 3: Pressing the

(currently on-display) signal values at that moment into the area with the selected memory number (address).

TIP

To cancel the memory mode (saving/reading), press the

(Executing the MEM SAVE function automatically cancels the memory mode.)

key one more time.

key.

key, select the desired memory

key saves the sourced and measured

6.1.3 Overwriting Data in Memory

Step 1: Press the Step 2: Using the pair of

number (address).

Step 3: Press the Step 4: Pressing the

that memory number.

key.

key, select the desired memory

key. The LCD shows to alert you.

key once again overwrites the data in

6-4

IM CA71-E

6.1 Saving Data into Memory

NOTE

To stop overwriting the data, press the key one time. This cancels saving data, reverting to the original state of being able to

save/read data to/from memory.

TIP

To cancel the memory mode (saving/reading), press the

(Executing the MEM SAVE function automatically cancels the memory mode.)

key one more time.

6.2 Reading Data from Memory

Step 1: Press the

The LCD shows MEM No. xx. At this point, the MEM No. indicator shows a memory number

immediately following the one most recently used to save data. (Memory is ready for data saving.)

key once.

Memory Functions

Step 2: Pressing the

indication to blink, indicating the calibrator is reading from memory.

Step 3: Using the pair of

whose data you want to read.

The LCD shows the data thus read out of memory. The items of the read data are shown on their respective

If the area with the memory number contains no saved data,

measured-value and generated-value display areas.

the LCD shows - - - - -.

key causes the on-screen READ

key, select the memory number

TIP

• To cancel reading from the memory mode, press the

• To save data anew while reading from memory, overwrite the existing data by following step 2 in subsection 6.1.3, "Overwriting Data in Memory."

key or the key one more time.

IM CA71-E

6-5

6.3 Clearing Data in Memory

6.3.1 Clearing Data by Selecting Desired

Memory Number

Step 1: Press the The MEM No. indicator on the LCD turns on.

Step 2: Using the pair of

whose data you want to clear.

Step 3: Pressing the

indication

(no.88 indicates object MEM No. ) Step 4: Pressing the

the selected memory number.

TIP

• To cancel clearing the data after the alarm indication is given, press the

The calibrator reverts to memory mode (saving/reading).

• You can also clear the data after having read it from memory.

key.

key once.

key, select the memory number

key causes the LCD to show the alarm

key once again clears the data with

6-6

IM CA71-E

ALL CLEAr alarm indication

6.3 Clearing Data in Memory

6.3.2 Clearing All In-Memory Data Globally

Step 1: Press the The MEM No. indicator on the LCD turns on.

Step 2: Hold down the

The LCD shows the

Step 3: Pressing the

memory.

TIP

To cancel clearing the data after the alarm indication is given, press the

The calibrator reverts to memory mode (saving/reading).

key.

key once.

key for at least ve seconds.

alarm indication.

key once again clears all of the data in

Memory Functions

6.4 Sending Out Data from Memory

- CA71 only -

See Chapter 8, "Communication Function."

IM CA71-E

6-7

7. Functions Provided by DIP Switch

DIP switch

By conguring the DIP switch, you can use the functions listed below.

The DIP switch can be found by removing the battery holder cover at the back of the calibrator.

CAUTION

Turn off the calibrator before you change the DIP switch conguration.

Functions Provided by DIP Switch

DIP Swich

Position

Sweep Selects the sweep or auto-step function.

Speed

INT RJ

IPTS-68

No use Denotes the position is not used.

Temp OFF

Contact In

No use Denotes the position is not used.

Changes the speed setpoint of the sweep or auto-step function.

Selects the internal reference junction

compensation for TC signal generation. Selects the IPTS-68 temperature scale for

temperature signal generation or measurement.

Selects contact input based operation for pulse measurement.

Description

Factory Setting

OFF

(left-side)ON(right-side)

12345678

IM CA71-E

7-1

7.1 Sweep Function

The SOURCE ON

The SOURCE OFF

OFF

Sweep Mode Operation

7.1 Sweep Function

The sweep function lets you linearly change the calibrator output as

shown in the following gure.

Setpoint

Sourced-value reading

OFF

SOURCE ON key operation

Press (ON)

OFF

Press (ON)

Step 1: Press the

indication blinks.

Actual output

Press Press

key to turn off the calibrator.

indication blinks.

Press

When the SOURCE ON key is pressed at midpoints during a change in the output.

Step 2: Place switch 1 (Sweep switch) in the ON (right-side)

position.

Step 3: By setting the position of switch 2 (Speed switch),

OFF (left-side): 16 sec; ON (right-side): 32 sec Step 4: Press the

The LCD shows SWEEP . Step 5: Using the function selector switch, select the function

7-2

change the sweep speed.

key to turn on the calibrator.

(voltage, current, resistance, thermocouple, or RTD) for which you want to source a signal. In the case of pulse source, the sweep function is disabled.

IM CA71-E

7.1 Sweep Function

Step 6: Using the pair of

the signal to be output.

The lower limit is set to a value predetermined depending on

the selected range.

Step 7: Pressing the

begins to increase.

• The LCD shows and the lower limit (default) for approximately two seconds.

The calibrator outputs the default.

• Then, the LCD reading and the output value begin to increase in xed increments, up to the upper limit, in the sweep time set in the preceding steps.

• When the output reaches the setpoint, the calibrator retains the output as is, and automatically holds sweep operation.

Step 8: Pressing the

begin decreasing. The output value decreases down to the lower limit in the same amount of time it took to increase up to the upper limit. When the output reaches the lower limit, the calibrator retains the output as is for approximately three seconds, and then automatically turns it off.

Thus, one cycle of sweeping is completed. Step 9: To quit the sweep function, turn off the calibrator by pressing

the

key.

Step 10: Place switch 1 back in the OFF (left-side) position to disable

the sweep function.

and keys, set the upper limit of

Functions Provided by DIP Switch

key initiates sweeping and the output value

key once again causes the output value to

NOTE

• When the output reaches the lower limit, the calibrator retains the output as is for three seconds, and then turns it off. Thus, one cycle of sweeping is completed.

• To alter the direction in which the output changes, press the sweeping is in progress (LCD reading is changing).

The calibrator alters the direction of change and continues sweep operation.

For example, pressing the

the output to begin decreasing.

key during an increase in the output causes

key when

IM CA71-E

7-3

Sourced-value reading

SOURCE ON key operation

Auto Step Operation (when the default of n is set to 1)

7.2 Auto Step Function

The auto step function automatically changes the variable n of the n/m output in a step-by-step manner, as shown in the following gure, when the divided output function (n/m) is selected.

Setpoint

OFF

Press

(ON)

Step 1: Press the

3 3

2 2

Stepping time setpoint

key to turn off the calibrator.

Actual output

Step 2: Place switch 1 (Sweep switch) in the ON (right-side)

position.

Step 3: By setting the position of switch 2 (Speed switch),

set the time of one step.

OFF (left-side): 2.5 sec/step; ON (right-side): 5 sec/step Step 4: Press the

key to turn on the calibrator.

Step 5: Using the function selector switch, select the function

(voltage, current, resistance, thermocouple, or RTD) for which you want to source a signal.

In the case of pulse source, the auto step function is disabled.

Step 6: Set the output value. Step 7: Press the

key.

The SWEEP indication on the LCD changes to AUTO STEP

and the n/m symbol turns on.

7-4

IM CA71-E

7.2 Auto Step Function

Step 8: Using each pair of

the denominator m and the starting setpoint of the enumerator n.

(See Section 4.6, "Divided Output Function (n/m),

for further details.)

The starting setpoint is the minimum of the variable n for

auto step operation.

Step 9: Pressing the

the divided output (n/m), as described below.

Assuming the starting value of the variable n is 1,

the output cyclically changes with the variable n as n changes in the following manner.

n = 1 → 2 → 3 → · · · (m – 1) → m → (m – 1) → · · · →

2 → 1 → 2 → 3 → · · ·

Step 10: To quit the auto step function, turn off the calibrator by

pressing the

Place switch 1 back in the OFF (left-side) position. Note that disabling the divided output mode (n/m) before

placing switch 1 back in the OFF position enters sweep mode.

TIP

• Pressing the key to change to the SOURCE OFF state pauses the auto step operation.

• To execute the auto step function again, press the

The auto step operation resumes from the value of n shown on the LCD.

and keys, set the value of

Functions Provided by DIP Switch

key initiates the automatic stepping of

key.

IM CA71-E

7-5

7.3 Selecting the INT RJ Function

The INT RJ function compensates for the measured reference

junction temperature by using the calibrator's built-in RJ sensor.

The function enables you to generate thermoelectromotive force that is based on the measured temperature from the calibrator's output terminal. The built-in temperature sensor is located near the calibrator's terminals. Because the thermoelectromotive force generated using this method does not match that generated using an external RJ sensor,* the accuracy of this measurement is not guaranteed. For more accurate reference junction compensation, be sure to use the optional RJ sensor (P/N: B9108WA).

* The terminal temperature of the thermometer under verication

is measured using an external RJ sensor, and this temperature

is used as the reference junction temperature.

Step 1: Press the Step 2: Place switch 3 (INT RJ switch) in the ON (right-side) position.

The calibrator detects temperature using its built-in

temperature sensor and outputs reference junction-

compensated thermoelectromotive force appropriate for the detected temperature.

Step 3: To disable the INT RJ function, turn off the calibrator by

pressing the

Step 4: Place switch 3 back in the OFF (left-side) position.

TIP

Even when the INT RJ function is selected, the temperature detected by an external RJ sensor precedes any other measured temperature if you plug the sensor into the RJ INPUT connector.

For further details, see Appendix 1, " Reference Junction Compensation."

key to turn off the calibrator.

key.

7-6

IM CA71-E

7.4 Selecting the IPTS-68 Function

By placing switch 4 (IPTS-68 switch) in the ON (right-side) position, you can select the IPTS-68 temperature scale when you choose the type-K, E, J, T, N, R, S or B thermocouple or the Pt100 RTD. Placing the switch in the OFF position results in the selection of the ITS-90 temperature scale.

TIP

When you have selected a type of thermocouple or RTD, the LCD shows IPTS-68.

7.5 Switch Not Used

Although switch 5 (No Use switch) of the DIP has no effect on calibrator operation, the switch should be placed in the OFF (left-side) position.

Functions Provided by DIP Switch

7.6 Temp Switch

Check that the switch should be placed in the OFF position.

7.7 Selecting the Contact In Function

(Contact Input for Pulse Measurement)

By placing switch 7 (Contact In switch) in the ON (right-side) position, you can measure transistor contact on-off signals. If you select the contact input function, the appears on the LCD. By placing the switch in the OFF position, you can measure normal pulse.

(contact) symbol

IM CA71-E

7-7

8. Communication Function - CA71 only -

You can congure the calibrator from a personal computer just as you do with the calibrator's panel keys (except for turning on/off the power, conguring the function selector switch, and setting the communication function). You can also verify the setpoint, measured value and status of the calibrator.

NOTE

• With the optional communication cable (P/N: 91017), you can use the RS232 serial port (9-pin D-sub) of a personal computer or any other equipment.

• In talk-only or printer mode, you can output the source setpoint and measured value at preset intervals.

Communication Function

8.1 Cables Connection and Interface Specications

■ Connecting Communication Cable

Remove the I/O port cover at the back of the calibrator and connect the communication cable (P/N: 91017) to the I/O port.

■ Setting RS232 Parameters

Baud rate: 9600 baud Parity: None Stop bits: 2 bits Data length: 8 bits

Flow control: None (Xon/Xoff control for printing only)

Delimiter: Fixed to CrLf

IM CA71-E

8-1

8.2 Setting the Mode

Step 1: Press the

the

The LCD shows

, or in its lower section.

Step 2: Using the pair of Step 3: Press the

If you set the mode to When the

outputs one data item.

Step 4: If you set any value using the pair of

shown, the calibrator outputs data using the value thus

set as the time interval (sec).

The value should be set within the range from 0 to 3600.

TIP

• To close the communication setting screen, press the key once again while simultaneously holding down the

• Even if you turn off the calibrator, the communication mode and interval you have set are saved internally until you replace the batteries or

recongure the communication function.

Thus, communication will take place with the previous settings.

key while simultaneously holding down

key.

in its upper section and either

and keys, select , or .

key to conrm your mode selection.

or , the LCD shows .

is indicated, each press of the key

and keys with

key.

8.3 Types of Mode

: Normal mode – Permits normal transmission and reception.

: Talk-only mode – Outputs the source setpoint and measured

: Printer mode – Outputs the source setpoint and measured

*: For a 0-second interval, each press of the

item. For other intervals, pressing the communication.

8-2

value at preset intervals (0* to 3600 sec).

value to a printer at preset intervals (0* to 3600 sec).

key outputs one data

key initiates or terminates

IM CA71-E

8.4 Data Format

TIP

When communication is in progress, the indicator blinks, telling you data is being output.

Care must be taken therefore, since the hold function of the MEASURE mode is disabled if you select

or .

8.4 Data Format

Data is output from the calibrator in the following format. Source: Function 1V Range DC V Data 1.0000 Measure: Function 100 mV Range k Data 25.5C

8.5 Data Structure

The calibrator's program has the following data structure.

Command + Parameter + Delimiter

Command: Dened by one to three alphabetical

upper-case letters. Parameter: A string of ASCII-code numerals or characters. Delimiter: Fixed to CrLf.

Communication Function

IM CA71-E

8-3

8.6 Commands

Command Description

BL Turns the back lighting on and off/queries the current setting. DW Moves down the “m-th” digit of the sourced setpoint by one digit. UP Moves up the “m-th” digit of the sourced setpoint by one digit. H Enables/Disables the output data header/queries the current setting. HD Enables/Disables data hold mode/queries the current setting. MF Queries the measurement function. MO On/Off of measurement/queries the current setting. MR Sets the measuring range/queries the current setting. OD Outputs measured value. OE Outputs error information. OR Queries whether an external RJC sensor is connected. OS Outputs the setting information. SD Sets sourced setpoint/queries the current setting. SF Queries the source function. SO On/Off of source output/queries the current setting. SR Sets the sourcing range/queries the current setting. SY Switches between the normal and adjustment modes/queries the

current setting. CD Sets the sourced setpoint/queries the current setting. CL Sets the adjustment item/queries the current setting. CP Sets the adjustment point. CW Saves the adjusted data. CMF Queries the measurement function. CSF Queries the source function. OM Queries memory data. NM Sets divided output (n/m) mode/queries the current setting. ND Sets n/m values in divided output (n/m) mode/queries the current

setting. TE Sets the temperature monitor display for sourced TC/RTD

range/queries the current setting. (TC, RTD mode only) PU Sets the display for sourced pulse range/queries the current setting.

8-4

IM CA71-E

Turns

the back lighting on and off /queries the

When normal

m=0: Hold Off m=1: Hold On

8.7 Detailed Description of Commands

Syntax for setting

BLm<delimiter>

Syntax for query

BL?<delimiter> ⇒ Response: BLm<delimiter>

Description of parameter

m=0: Off m=1: On

Syntax for setting

DWm<delimiter>

Description of parameter

m: Specifies a digit 1 (the lowest digit) to 5 (the highest digit)

Syntax for setting

UPm<delimiter>

Description of parameter

m: Specifies a digit 1 (the lowest digit) to 5 (the highest digit)

Syntax for setting

Hm<delimiter>

Syntax for query

H?<delimiter> ⇒ Response: Hm<delimiter>

* For details on the header, see the OD command.

Description of parameter

m: Enables/Disables the header

Syntax for setting

HDm<delimiter>

Syntax for query

HD? <delimiter> ⇒ Response: HDm (delimiter)

Description of parameter

m: Specifies data hold

current setting.

Moves down the “m-th” digit of the sourced setpoint by one digit.

Moves up the “m - th” digit of the sourced setpoint by one digit.

Enables/Disables current setting.

m=0: Disabled m=1: Enabled

Enables/Disables setting.

the output data header/queries the

data hold mode/queries the current

condition

When normal

condition

When normal

condition

When normal

condition/adjustment

When normal

condition

Communication Function

IM CA71-E

8-5

8.7 Detailed Description of Commands

MF Queries the measurement function.

Syntax for query

MF? <delimiter> ⇒ Response: MFm<delimiter>

Description of parameter

m: Measurement function

m=0: 300V AC m=1: 100V m=2: 10V m=3: 1V m=4: 100mV m=5: Resistance

Syntax for setting

Syntax for query

Description of parameter

Syntax for setting

Syntax for query

Description of parameter

m=6: Frequency m=7: Current

MO On/Off of measurement/queries the current setting.

MOm<delimiter>

MO?<delimiter> ⇒ Response: MOm<delimiter>

m: On/Off condition

m=0: Off m=1: On

Sets

MRm<delimiter>

MR? <delimiter> ⇒ Response: MRm<delimiter>

m: Measuring range

[100V] m=0: DC m=1: AC [10V] m=0: DC m=1: AC [1V] m=0: DC m=1: AC [100mV] (When normal condition) m=0: 100mV DC m=1: TcK m=2: TcE m=3: TcJ m=4: TcT m=5: TcR m=6: TcB m=7: TcS m=8: TcN m=9: TcL m=10: TcU [100mV] (When adjustment) m=0: 100mV DC m=1: TcK m=2: TcE m=4: TcT [Ω] m=0: 400Ω m=1: Pt100 m=2: JPt [Freq ] m=0: 100Hz m=1: 1kHz m=2: 10kHz [mA]

the measuring range/queries the current

setting.

m=0: 20mA m=1: 100mA

When normal

condition

When normal

condition/adjustment

When normal

condition/adjustment

8-6

IM CA71-E

8.7 Detailed Description of Commands

OD Outputs measured value.

Syntax for setting

OD<delimiter> ⇒ Response: ODabcde<delimiter>

Description of parameter

<Header section> (Output only when the header is set to “enabled”.)

a= V: Voltage A: Current O: Resistance T: Temperature F: Frequency b= DC: Direct current AC: Alternating current c= N: Normal O: Overrange E: No data

d = Measured value, mantissa part (7 digits) e = Measured value exponent part (E- 3 / E+0 / E+3) de = 99999. E+3 when overrange occurs or no data reside.

OE Outputs error information.

Syntax for setting

OE<delimiter> ⇒ Response: ERRm<delimiter>

Description of parameter

m: Error information

m=00: No error m=11: Received command not used in this instrument m=12: Specified parameter value is outside allowed range. m=13: Attempt made to execute a command that is not permitted in

a certain status of the instrument.

m=16: An error was received during adjustment.

Syntax for query

OR<delimiter> ⇒ Response: m

Description of parameter

m: Connecting condition of external RJC

OS Outputs the setting information.

Syntax for setting

OS<delimiter>

Response

Measure m<CrLf> m= On/Off Function m<CrLf> m= Measurement function Range m<CrLf> m= Measuring range Source m<CrLf> m= On/Off Function m<CrLf> m= Source function Range m<CrLf> m= Source range Data m<CrLf> m= Sourced setpoint Light m<CrLf> m= On/Off

Queries

whether an external RJC sensor is

connected.

m=0: Not connected m=1: Connected

When normal

condition/adjustment

When normal

condition/adjustment

When normal

condition

When normal

condition

Communication Function

IM CA71-E

8-7

8.7 Detailed Description of Commands

SD Sets sourced setpoint/queries the current setting.

Syntax for setting

SDm<delimiter>

Syntax for query

SD?<delimiter> ⇒ Response: SDm<delimiter>

Description of parameter

m: Sourced setpoint (7 digits) ex. +1.0000

SF Queries the source function.

Syntax for query

SF? <delimiter> ⇒ Response: SFm<delimiter>

Description of parameter

m: Function

m=0: 30V m=1: 10V m=2: 1V m=3: 100mV m=4: Resistance m=5: Pulse m=6: 20mA m=7: 4 to 20mA

Syntax for setting

Syntax for query

Description of parameter

Syntax for setting

Syntax for query

Description of parameter

m=8: 20mASINK

SO On/Off of source output/queries the current setting.

SOm<delimiter>

SO? <delim iter>

m: Condition of generation (source)

m=0: Off m=1: On

Sets

SRm<delimiter>

SR?<delimiter> ⇒ Response: SRm<delimiter>

m: sourcing range

setting.

[100mV] (When normal condition) m=0: DC 100mV m=1: TcK m=2: TcE m=3: TcJ m=4: TcT m=5: TcR m=6: TcB m=7: TcS m=8: TcN m=9: TcL m=10: TcU [100mV] (When adjustment) m=0: DC 100mV m=1: TcK [Ω] m=0: 400Ω m=1: Pt100 m=2: JPt [Freq ] m=0: 500Hz m=1: 1kHz m=2: 10kHz

Response: SOm <delimiter>

⇒

the sourcing range/queries the current

When normal

condition

When normal

condition

When normal

condition/adjustment

When normal

condition/adjustment

8-8

IM CA71-E

8.7 Detailed Description of Commands

Switches

Syntax for setting

SYm<delimiter>

Syntax for query

SY?<delimiter> ⇒ Response: SYm<delimiter>

Description of parameter

m: Mode

Syntax for setting

CDm<delimiter>

Syntax for query

CD? <delimiter> ⇒ Response: CDm<delimiter>

Description of parameter

Syntax for setting

CLm<delimiter>

Syntax for query

CL?<delimiter> ⇒ Response: CLm<delimiter>

Description of parameter

m: Adjustment item

CP Sets the adjustment point. When adjustment

Syntax for setting

CPm<delimiter>

Description of parameter

m: Adjustment point

CW Saves the adjusted data. When adjustment

Syntax for setting

CW<delimiter>

modes/queries the current setting.

m=0: Normal mode m=1: Adjustment mode

Sets setting.

m: Sourced setpoint (8 digits) ex. +1.00003

Sets setting.

m=3: Adjustment of source m=4: Adjustment of measurement

m=0: FS adjustment m=1: Zero adjustment

Be sure to execute CW command after adjustment for each function/range. Without executing CW command, the adjusted value will be deleted when the power is turned off.

between the normal and adjustment

the sourced setpoint/queries the current

the adjustment item/queries the current

When normal

condition/adjustment

When adjustment

Communication Function

IM CA71-E

8-9

8.7 Detailed Description of Commands

CMF Queries the measurement function. When adjustment

Syntax for query

CMF?<delimiter> ⇒ Response: CMFm<delimiter>

Description of parameter

m: Measurement function

m=0: AC 300V m=1: 100V m=2: 10V m=3: 1V m=4: 100mV m=5: Resistance

Syntax for query

Description of parameter

Syntax for query

Response:

Description of parameter

m=6: Frequency m=7: Current

CSF Queries the source function. When adjustment

CSF?<delimiter> ⇒ Response: CSFm<delimiter>

m= Function

m=0: 30V m=1: 10V m=2: 1V m=3: 100mV m=4: Resistance m=5: Pulse m=6: 20mA m=7: 4 to 20mA m=8: 20mASINK

OM Queries memory data.

OMm<delimiter>

abcde, fghij [, fghij ] <delimiter> <Header section of measured value>

a= V: Voltage A: Current O: Resistance T: Temperature F: Frequency b= DC: Direct current AC: Alternating current c= N: Normal O: Overrange E: No data

d = Measured value, mantissa part (7 digits) e = Measured value exponent part (E- 3 / E+0 / E+3)

f= V: Voltage A: Current O: Resistance T: Temperature F: Frequency g= DC: Direct current AC: Alternating current h= N: Normal E: No data i = Sourced setpoint, mantissa part (7 digits) j = Sourced setpoint exponent part (E - 3 / E+0 / E+3)

m: Number of memory 1 to 50

When normal

condition

8-10

IM CA71-E

m=2: Pulse number

8.7 Detailed Description of Commands

Syntax for setting

MNm<delimiter>

Syntax for query

MN?<delimiter> ⇒ Response: MNm<delimiter>

Description of parameter

m: n/m mode

Syntax for setting

NDnm<delimiter>

Syntax for query

ND?<delimiter> ⇒ Response: NDnm <delimiter>

Description of parameter

n: n-value (2 digits among numbers from 00 to 19, where n ≤ m) m: m-value (2 digits among numbers from 01 to 19, where n ≤ m)

Syntax for setting

TEm<delimiter>

Syntax for query

TE?<delimiter> ⇒ Response: TEm<delimiter>

Description of parameter

m: Condition of display

Syntax for setting

PUm<delimiter>

Syntax for query

PU?<delimiter> ⇒ Response: PUm<delimiter>

Description of parameter

m: Condition of display

Sets divided output (n/m) mode/queries the current setting.

m=0: Off m=1: On

Sets

n/m values in divided output (n/m) mode/

queries the current setting.

Sets the temperature monitor display for sourced TC/RTD range/queries the current setting. (TC, RTD mode only)

m=0: Value of temperature m=1: Value of equivalent voltage (resistance) m=2: Reference junction temperature

Sets the display for source pulse range/queries the current setting.

m=0: Frequency m=1: Amplitude

When normal

condition

When normal

condition

When normal

condition

When normal

condition

Communication Function

IM CA71-E

8-11

9. Troubleshooting and Calibration

■ Troubleshooting

Failure Checklist

Troubleshoot the cause of any problem using the following checklist. Should the problem persist even if you have taken the given corrective action or if you notice any problem not listed herein, contact the vender from which you purchased the instrument.

Problem Corrective Action

The LCD shows nothing even if the POWER switch is turned on.

The LCD shows everything except for the measured value.

The SOURCE indicator remains set to OFF even if the SOURCE ON key is operated for signal source.

The output cannot be turned on for signal source, or no signal is output even if the output is turned on.

The measured and sourced signal values are abnormal.

The calibrator cannot be congured or controlled via RS232 interface-based communication.

The hold function of the MEASURE mode does not work at all.

The LCD shows Err60 at power-on.

– When the calibrator is operated on batteries

• Make sure the batteries are securely housed in the holder.

• Check if the batteries are too low.

• Check if the AC adapter plug is inserted to the calibrator but the adapter is not connected to the AC power source.

– When the calibrator is operated on AC adapter

• Check if the AC adapter is reliably supplied with electricity.

• Check if the MEASURE OFF key for turning on/off the MEASURE mode is set to OFF.

• When in voltage signal source, check if the load

current is beyond the specied limits.

• When in current signal source, check if the load resistance is too large.

• The built-in fuse may blow off if any abnormal voltage level is applied to the output terminals.

If this is the case, the calibrator needs repair.

• Check if the signal carries noise.

•

When in resistance signal source, check if the input stage of the device under test contains a capacitor with an excessively large capacitance.

• Make sure the communication parameter settings are correct.

• Check if the communication mode is set to

tonLy

• The calibrator needs repair.

Troubleshooting and Calibration

IM CA71-E

9-1

9. Troubleshooting and Calibration

■ Calibration

We recommend that you calibrate the instrument once a year to maintain its accuracy (high accuracy). For a service of calibration, contact the dealer from which you purchased the instrument.

9-2

IM CA71-E

10. Method of Calibrator Adjustment

We recommend that you calibrate the instrument once a year to maintain its accuracy (high accuracy).

If the calibrator needs to be readjusted, follow the procedure

described below.

For a service of calibration or readjustment, contact the dealer from

which you purchased the instrument.

10.1 Calibration Standard Selection and

Environmental Requirements

■ Selection of Calibration Standard

Select an appropriate calibration standard having the ranges shown in the following table and accuracy levels equal to or higher than those shown in the table.

Method of Calibrator Adjustment

Source Functions

Function

to Be

Adjusted

DCV

DCA 20 mA 22 mA ±

SINK 20 mA 20 mA ±

Ω/1 mA 400 Ω 440 Ω ±

Ω/5 mA 400 Ω 2.2 V/5 mA

Standard's

Name

Digital multimeter (DMM)

Note:

Also use a 100 Ω

standard resistor for the DCA and SINK functions and a high-precision 5 mA current source

for the Ω/5 mA

function.

Range

to Be

Adjusted

100 mV 1 V 10 V 30 V

Measuring

Range

110 mV

1.1 V 11 V 33 V

Accuracy Remarks

0.002%+1.5 μV)

(

0.002%+10 μV)

(

0.002%+100 μV)

(

±(0.002%+1 mV)

0.002%+0.3 μA)

(

0.002%+0.3 μA)

(

0.0025%+0.01 Ω)

(

±(0.0025%

)

Measure the current with the DMM’s mA range or measure the voltage drop across

the 100 Ω standard

resistor with the DMM’s voltage range.

DMM's resistance range (1mA)

High-precision current source (5 mA)

DMM's voltage range

---

IM CA71-E

10-1

10.1 Calibration Standard Selection and Environmental Requirements

Key for confirming/saving adjustment value

Keys for switching between the measurement and source CAL modes.

0 denotes zero-point

CAL-mode Operation keys and Display Indications

Measurement Functions

Function

to Be

Adjusted

DCV

DCA

ACV

Standard's

Name

High-precision calibrator

Decade resistance box

AC calibrator or AC voltage source

Range

to Be

Adjusted

100 mV 1 V 10 V 30 V

20 mA 100 mA

--- 400 Ω ±(0.01%) --1V

10 V 100 V 300 V

Measuring

Range

100 mV 1 V 10 V 30 V

20 mA 100 mA

1 V 10 V 100 V 300 V

Accuracy Remarks

±(0.0025%+1 μV) ±(0.0025%+20 μV)

±(0.0025%+0.2 mV) ±(0.005%+2 mV)

0.0025%+0.4 μA)

(

0.004%+3 μA)

(

±(0.08%+0.015%) ---

---

■ Environmental Requirements

Ambient temperature: 23 ±1°C Relative humidity: 45 to 75% Warm-up: Before use, warm up the calibration

standard for the period of time specied for the standard.

The indicator blinks when any source function is being operated.

Keys for adjusting the setpoint value of source

Keys for selecting/canceling CAL mode (Press in combination.)

10-2

Auxiliary-digit indicator (The value should be read as 400.000.)

CAL mode indicator adjustment and FS

denotes full-scale adjustment.

Keys for adjusting the two digits, including the auxiliary digit

IM CA71-E

10.2 Adjusting Source Functions

20 mA output

Hook-ups for Adjustment

10.2 Adjusting Source Functions

Table 10.1 Adjustment Points of Source Functions

Range

100 mV 0 100 mV --1 V 0 1 V --10 V 0 10 V --30 V 0 30 V --20 mA 0 20 mA See the gure below. 20 mA SINK 0.1 mA 20 mA See the gure below.

400 Ω/1 mA 0 400 Ω Four-wire connection 400 Ω/5 mA 0 400 Ω See the gure below.

*1: Adjust the source functions so that the readings of the calibration standard

(output values of the CA51/71) match the adjustment points listed above.

Adjustment Points *

CAL 0 CAL FS

Remarks

Method of Calibrator Adjustment

TIP

• You can also select only the range in need of readjustment to adjust it separately.

• Always make zero-point (0) adjustments together with full-scale (FS)

adjustments.

CA71

Standard resistor

SINK

100 Ω

20 mA

SINK

20 mA and SINK ranges 400 Ω/5 mA

Voltage range

24V

DMM

Power

supply

CA71

5 mA

DMM

Voltage range

High-precision current source

IM CA71-E

Step 1: Press the

the

Step 2: Pressing the The

key while simultaneously holding down

key. The LCD shows .

key enters the source CAL mode.

indicator blinks on the LCD and the symbol

appears.

The calibrator is now ready for the zero-point adjustment of

source functions.

10-3

10.2 Adjusting source Functions

Step 3: From Table 10.1, select the range you want to adjust.

Then, point the function selector switch to that range and

press the

Step 4: Conform that the Step 5: Read the calibrator output on the calibration standard.

Then, using the lowest-order pair of

adjust the reading so that it matches the given CAL 0

adjustment setpoint in Table 10.1. In the CAL mode,

the lowest-order pair of or decrease the least-signicant two digits, including the auxiliary digit.

Adjust the value measured with the calibration standard to

the given adjustment setpoint in Table 10.1.

key.

symbol is appearing on the LCD.

and keys,

and keys are used to increase

Step 6: Press the The CAL indicator on the LCD changes to

key to conrm the CAL 0 adjustment setpoint.

setting the calibrator ready for full-scale adjustment.

Step 7: Using the lowest-order pair of

and keys,

adjust the reading of the calibration standard so that it

matches the given CAL FS adjustment setpoint in Table 10.1.

Step 8: Press the

key to conrm the CAL FS adjustment setpoint.

The 0 and FS symbols on the LCD blink.

Step 9: Pressing the

once again saves the adjustment setpoint in

memory.

Step 10: The 0 and FS symbols stop blinking,

causing the calibrator to return to the state discussed in step 4.

Using the function selector switch, select the next range. By repeating steps 4 to 9, you can adjust the source function

assigned to that range.

10-4

IM CA71-E

10.2 Adjusting source Functions

NOTE

• Saving to memory results in the overwriting of existing data.

Be extremely careful since the previous adjustment setpoints are cleared.

• Both the thermocouple and RTD ranges are adjusted at the same time

when the 100 mV and 400 Ω ranges are adjusted.

TIP

With the CAL mode selected, press the key while holding down

key.

the This key operation cancels the CAL mode (the same key operation as for

selecting the CAL mode). You can use the same key operation to cancel the CAL mode during

adjustment, before saving to memory.

CAUTION

Method of Calibrator Adjustment

Precautions when adjusting the 400 Ω range for resistance signal source (1) Internal Offset Adjustment

When setting a resistance of 0.00 Ω , make sure the voltage between

the H and L terminals is within ±20 µV. If the voltage is beyond the limits,

internal adjustments must be made. Contact the vender from which you

purchased the instrument.

(2) Notes on Resistance-measuring Current

Adjusting the 400 Ω range requires drawing two types of resistance-

measuring current – 1 mA and 5 mA – from an external device.

Adjust the range separately for each of these currents.

Adjustment for 1 mA

This adjustment is possible with the resistance measuring range of the calibration standard (digital multimeter). At this point, make sure the resistance-measuring current is 1 mA.

Adjustment for 5 mA

Like the method of adjusting the 400 Ω/5 mA range shown in the gure (Hook-ups for Adjustment) on page 10-3, you can make this adjustment

by applying the reference current of 5 mA from the external device and then measuring the resulting voltage drop.

IM CA71-E

10-5

10.3 Adjusting Measurement Functions

Table 10.2 Adjustment Setpoints of Measurement Functions

Range

DC 100 mV --- 100 mV --DC 1 V --- 1 V --DC 10 V --- 10 V --DC 100 V --- 100 V --DC 20 mA --- 20 mA --DC 100 mA --- 100 mA --400 Ω 0 Ω 380 Ω Three-wire connection AC 1 V 0 V 1V/50 to 60 Hz --AC 10 V 0 V 10 V/50 to 60 Hz --AC 100 V 0 V 100 V/50 to 60 Hz --AC 300 V 0 V 300 V/50 to 60 Hz ---

*2: Apply the reference input signals listed above from the calibration standard.

Adjustment Points *

CAL 0 CAL FS

Remarks

TIP

• You can also select only the range in need of readjustment to adjust

it separately.

• Always make zero-point (0) adjustments together with full-scale (FS) adjustments.

10.3.1 Adjusting DC Voltage and DC Current Ranges

Step 1: Press the

the

Step 2: Pressing the highest-order

Step 3: Pressing the

The appears.

The calibrator is now ready for the dening the CAL FS

setpoint of measurement functions.

10-6

key while simultaneously holding down

key. The LCD shows .

key causes the LCD to show

key enters the measurement CAL mode.

indicator blinks on the LCD and the symbol

IM CA71-E

CAL-mode Operation Keys and Display Indications

10.3 Adjusting Measurement Functions

Step 4: Apply the CAL FS adjustment setpoint input of each range in

Table 10.2 from the calibration standard to the H and L input terminals of the calibrator.

Step 5: Pressing the

setpoint. At this point, the

Step 6: Pressing the

in memory.

key conrms the CAL FS adjustment

symbol blinks.

once again saves the adjustment setpoint

Method of Calibrator Adjustment

NOTE

• Range adjustments are made automatically within the calibrator so that the LCD reading matches the adjustment setpoint in question given in

the table with reference to the input applied as described above.

Therefore, you need not make any range adjustment with

• Saving the adjustment setpoint results in the overwriting of existing data.

Be extremely careful since the previous adjustment setpoints are cleared.

and keys.

Step 7: The

TIP

Press the key while holding down the key. This key operation cancels the CAL mode. You can use the same key operation to cancel the CAL mode during

calibration, before saving to memory.

When adjusting DC current range, using the change DC 20 mA → DC 100 mA.

symbol stops blinking, causing the calibrator to return to the state discussed in step 4. Using the function selector switch, select the next range. By repeating steps 4 to 6, you can adjust the measurement function assigned to that range.

key,

IM CA71-E

10-7

10.3 Adjusting Measurement Functions

10.3.2 Adjusting AC Voltage and Resistance

(400 Ω) Ranges

Step 1: Press the

the

Step 2: Pressing the highest-order

Step 3: Pressing the

The

appears. The calibrator is now ready for dening the CAL 0

setpoints of measurement functions.

Step 4: Using the function selector switch, select the range to be

adjusted.

Step 5: Pressing the

The CAL indicator on the LCD changes to

setting the calibrator ready for full-scale calibration.

Step 6: Apply the CAL FS adjustment setpoint input of each range in

Table 10.2 from the calibration standard to the H and L input terminals of the calibrator.

Step 7: Pressing the

setpoint. At this point, the 0 and FS symbol blinks.

Step 8: Pressing the

in memory.

key while simultaneously holding down

key. The LCD shows .

key causes the LCD to show

key enters the measurement CAL mode.

indicator blinks on the LCD and the symbol

key conrms the CAL 0 adjustment setpoint.

key conrms the CAL FS adjustment

once again saves the adjustment setpoint

NOTE

• Range adjustments are made automatically within the calibrator so that the LCD reading matches the adjustment setpoint in question given in

the table with reference to the input applied as described above.

Therefore, you need not make any range adjustment with

• Saving the adjustment setpoint results in the overwriting of existing data.

Be extremely careful since the previous adjustment setpoints are cleared.

• The temperature measuring ranges of the RTD function are adjusted at

the same time when the 400 Ω range is adjusted.

10-8

and keys.

IM CA71-E

10.3 Adjusting Measurement Functions

Step 9: The 0 and FS symbols stop blinking, causing the calibrator

to return to the state discussed in step 4.

Using the measurement range setting rotary switch,

select the next range.

By repeating steps 4 to 8, you can adjust the measurement

function assigned to that range.

TIP

Press the key while holding down the key. This key operation cancels the CAL mode. You can use the same key operation to cancel the CAL mode during calibration,

before saving to memory.

10.4 Notes on the Adjustment of

Method of Calibrator Adjustment

10.5 Post-adjustment Verication

Temperature Ranges - CAL71 only -

Adjusting the temperature measuring ranges of the thermocouple function involves using special equipment to make reference junction compensation adjustments.

For this reason, contact the vender from which you purchased

the instrument to perform this adjustment.

When adjustment work is done, test the calibrator to ensure that adjustments have been made correctly and adjustment setpoints

have been saved into memory correctly. To do this test, turn off the calibrator once and turn it back on again. Then, place the calibrator in normal source or measurement mode and check the setpoints using the same calibration standard.

IM CA71-E

10-9

11. Using Accessories

Lead cables for

(B9108WA)

(for CA71 only)

The allowable voltage to ground when the included terminal adapter is attached to the input terminals is 30 Vpeak maximum.

When attaching accessories to the calibrator, refer to the following gure. When connecting the included terminal adapter, make sure the adapter is positioned in the correct orientation.

Terminal adapter

WARNING

(99021)

Lead cables for measurement (RD031)

Fuse

(A1635EF)

Black

Red

Black

Red

Black Black

source (98020)

Using Accessories

RJ sensor

AC adapter

RS232 communication cable (91017)

IM CA71-E

11-1

12. Specications

(1) Signal sourcing unit range and accuracy (for both CA51 and CA71)

Parameter

DC voltage

DC current

mA SINK

Resistance

RTD

TC *

Frequency, pulse

Temperature coefficient: Accuracy shown above × (1/5)/°C *1: Output up to 24 V/22 mA is possible when using the AC adapter.

*2: As per JIS C 1604 (ITS-90). IPTS-68 may be selected through internal settings (DIP switch). *3: Excitation current: If less than 0.1 mA to 0.5 mA, then add [0.025/ls (mA)] Ω or [0.06/ls (mA)]°C. *4: As per JIS C 1602 (ITS-90) (L and U are DIN specs). K, E, J, T, N, R, S, and B may be switched to IPTS-68 through internal settings (DIP switch)

*5: Frequency (interval between one pulse and another) and amplitude during pulse cycle source

Reference

100 mV 1 V 10 V 30 V 20 mA 4-20 mA 20 mA

400 Ω

Pt100 * JPt100 K E

T N L U

500 Hz 1000 Hz 10 kHz Pulse cycle *

(L and U are not switched).

may have the same range as during frequency source.

Range

-10.00 –110.00 mV

0 – 1.1000 V 0 – 11.000 V 0 – 30.00 V 0 – 24.000 mA 4/8/12/16/20 mA

0.1 – 24.000 mA

0 – 400.00 Ω

-200.0 – 850.0°C

-200.0 – 500.0°C

-200.0 – 1372.0°C

-200.0 – 1000.0°C

-200.0 – 1200.0°C

-200.0 – 400.0°C

-200.0 – 1300.0°C

-200.0 – 900.0°C

-200.0 – 400.0°C

0 – 1768°C

600 – 1800°C

1.0 – 500.0 Hz 90 – 1100 Hz

0.9 kHz – 11.0 kHz

1 – 99,999 cycles

Accuracy

(23±5°C per year)

±(0.02% + 15 μV) ±(0.02% + 0.1 mV) ±(0.02% + 1 mV) ±(0.02% + 10 mV)

±(0.025% + 3 μA)

±(0.05% + 3 μA) ±(0.025% + 0.1 Ω)

±(0.025% + 0.3°C)

±(0.02% + 0.5°C) (-100°C or greater) ±(0.02% + 1°C) (less than -100°C) ±(0.02% + 0.5°C) (0°C or greater) ±(0.02% + 1°C) (less than 0°C) ±(0.02% + 2.5°C) (less than 100°C) ±(0.02% + 1.5°C) (100°C or greater)

±(0.02% + 2°C) (less than 1000°C) ±(0.02% + 1.5°C) (1000°C or greater) ±0.2 Hz ±1 Hz ±0.1 kHz

---

±(% of setting + μV, mV, mA, Ω or °C)

Resolution

---

10 μV

Maximum output: 5 mA

0.1 mV Maximum output: 10 mA

1 mV

Maximum output: 10 mA

10 mV

1 μA

Maximum load: 12 V

4 mA

External power supply: 5 to 28 V

1 μA

0.01 Ω

Excitation current: 0.5 to 5 mA * If 0.1 mA, add 0.25 Ω or 0.6°C. Subject

0.1°C

device input capacitance: 0.1 µF or less

TC source accuracy does not

0.1°C

include RJ sensor accuracy.

< RJ sensor specs >

Measurement range: -10 to 50°C Accuracy

(when combined with main unit)

18 to 28°C: ±0.5°C Other than the above: ±1°C

1°C

0.1 Hz

Output voltage: +0.1 to +15 V

(zero base waveform)

1 Hz

Amplitude accuracy: ±(5% + 0.1 V) Maximum load current: 10 mA

0.1 kHz

Contact output (with 0.0 V amplitude setting, FET switch

1 cycle

ON/OFF)

Maximum open/close voltage/current: +28 V/50 mA

Remarks

Specications

IM CA71-E

12-1

Yokogawa Yokogawa CA71 Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

Checking Items in the Package

Precautions for Safe Use of the Instrument

Contents

1. Functions

2. Names and Functions of Parts

3. Before Starting Source/Measurement

4. Source

4.1 Connecting Cables to Terminals

4.2 Sourcing DC Voltage, DC Current or SINK Current Signal

4.2.1 Sourcing DC Voltage or DC Current Signal

4.2.2 4-20 mA Function

4.2.3 20 mA SINK Function

4.2.4 Using As 24-V Loop Power Supply

4.3 Sourcing Resistance or RTD Signal

4.4 Sourcing Thermocouple (TC) Signals

4.4.2 When No RJ Sensor Is Used

4.5 Sourcing Pulse Signals

4.5.1 Sourcing a Continuous Pulse Train

4.5.3 Using the Contact Output

4.6 Divided Output Function (n/m)

4.7 Sweep Function

4.8 Auto Step Function

4.9 Temperature Monitor Function

5. Measurement

5.1 Connecting Cables to Terminals

5.2 Measuring 300 V AC-range Voltage, DC Voltage, AC Voltage or DC Current

5.2.1 Measuring 300 V AC-range Voltage

5.2.2 Measuring DC or AC Voltage

5.2.3 Measuring DC Current

5.3 Measuring Resistance or RTD (CA71 only) Signal

5.4 Measuring Temperature with Thermocouple (TC) - CA71 only -

5.5 Measuring Frequency or Pulses

6. Memory Functions

6.1 Saving Data into Memory

6.1.1 Saving Data in the Order of Memory Numbers

6.1.2 Saving Data by Selecting Desired Memory Number

6.1.3 Overwriting Data in Memory

6.2 Reading Data from Memory

6.3 Clearing Data in Memory

6.3.2 Clearing All In-Memory Data Globally

7. Functions Provided by DIP Switch

7.1 Sweep Function

7.2 Auto Step Function

7.3 Selecting the INT RJ Function

7.4 Selecting the IPTS-68 Function

7.5 Switch Not Used

7.6 Temp Switch

8. Communication Function - CA71 only -

8.2 Setting the Mode

8.3 Types of Mode

8.4 Data Format

8.5 Data Structure

8.6 Commands

8.7 Detailed Description of Commands

9. Troubleshooting and Calibration

10. Method of Calibrator Adjustment

10.2 Adjusting Source Functions

10.3 Adjusting Measurement Functions

10.3.1 Adjusting DC Voltage and DC Current Ranges

11. Using Accessories