YOKOGAWA HANDY CAL CA51 User manual

User’s
Manual Model CA51/71
HANDY CAL Calibrators
IM CA71-E
1st Edition: Feb. 2002
IM CA71-E

IM CA71-E i
Disk No. CA71-E
1st Edition: Feb.2002
All Rights Reserved. Copyright © 2002, Yokogawa M&C Corporation
Introduction
Thank you for purchasing the CA51/71 HANDY CAL Calibrator. This
User’s Manual explains the functions of the CA51/71, as well as the
operating methods and handling precautions. Before using the CA51/
71, read this manual thoroughly to ensure correct use of the instru-
ment. When you have finished reading this manual, store it in the car-
rying case for future reference.
■Notes
●This manual exclusively describes the CA71, which is more multifunc-
tional 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

ii 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 (specifications) codes in the MODEL and SUFFIX
fields of the nameplate at the back of the instrument to ensure that the
instrument is exactly as specified in your purchase order.
• Model Codes
Model Specification
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 ven-
dor about the instrument.

IM CA71-E iii
Checking Items in the Package
Standard Accessories
Make sure that the package contains all the accessories listed below
and that they are all free from any damage.
Lead cables
for source
(98020)
Lead cables for
measurement
(RD031)
Carrying case
(93016) Fuse
(A1501EF)
Terminal adapter
(99021) AA-size (LR6) alkaline batteries
(four units)
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 accesso-
ries, contact the vendor from which you purchased the instrument.
Product Part Number Remarks
AC adapter A1020UP For 100 V AC
AC adapter A1022UP For 120 V AC
AC adapter B9108WB For 220 to 240 V AC
RJ sensor B9108WA For reference junction
compensation
Accessories case B9108XA
Communication cable (RS232) 91017 (For CA71 only)

iv IM CA71-E
Checking Items in the Package
Optional Spare Parts
Product Part Number Remarks
Lead cable for source 98020
Lead cable for measurement RD031
Carrying case 93016
Terminal adapter 99021
Used for temperature
measurement
Fuse A1501EF 10 units as a kit
Accessories case
AC adapter
RJ sensor Communication cable

IM CA71-E v
Precautions for Safe Use of the Instrument
For the correct and safe use of the instrument, be sure to follow the
cautionary notes stated in this manual whenever handling the instru-
ment. Yokogawa M&C Corporation shall not be held liable for any
damage resulting from use of the instrument in a manner other than
prescribed in the 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 precau-
tions 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.
NOTE
Draws attention to information essential for understanding the operation and
features.

vi IM CA71-E
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 in gases
Do not operate this instrument in areas where inflammable 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 protec-
tive features as fuses. Before operating the instrument, make sure the pro-
tective features are free from any defect.
●External connection
When connecting the instrument to the object under test or an external con-
trol 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 fire, use a fuse with ratings (current, voltage,
and type) specified for the instrument. Do not short-circuit the fuse holder.
●Correctly use the lead cables for measurement (P/N: RD031) and source (P/
N: 98020) without mistaking one for the other. For high-voltage measure-
ment, always use the lead cable for measurement.
●Opening of the case
No person other than our service personnel is allowed to open the case since
the instrument contains high-voltage parts.
For the safe use of the optional AC adapter, follow the precautions
given below.
WARNING
●Power supply
Before turning on the instrument, always make sure the voltage being sup-
plied matches the rated supply voltage of the instrument.
Precautions for Safe Use of the Instrument

IM CA71-E vii
1
Contents
Introduction .................................................................................................. i
Checking Items in the Package....................................................................ii
Precautions for Safe Use of the Instrument ................................................ v
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) ................................................. 4-9
4.4.2 When No RJ Sensor Is Used ........................................ 4-11
4.5 Sourcing Pulse Signals............................................................... 4-12
4.5.1 Sourcing a Continuous Pulse Train ............................... 4-12
4.5.2 Sourcing the Preset Number of Pulses (Pulse Cycle)... 4-14
4.5.3 Using the Contact Output.............................................. 4-16
4.6 Divided Output Function (n/m) .................................................... 4-18
4.7 Sweep Function .......................................................................... 4-20
4.8 Auto Step Function ..................................................................... 4-20
4.9 Temperature Monitor Function .................................................... 4-20
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 .......................................... 5-4
5.2.3 Measuring DC Current .................................................... 5-4
5.3 Measuring Resistance or RTD (CA71 only) Signal....................... 5-6
2
3
4
5
6
7
8
9
10
11
12

viii IM CA71-E
Contents
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....... 6-4
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 .................................................... 7-6
7.5 Switch Not Used ........................................................................... 7-7
7.6 Setting the Temp Switch ............................................................... 7-7
7.7
Selecting the Contact In Function (Contact Input for Pulse Measurement) .... 7-7
7.8 Disabling the Automatic Power-off Feature .................................. 7-7
8. Communication Function - CA71 only -................................... 8-1
8.1 Cables Connection and Interface Specifications .......................... 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......................................................................... 9-1

IM CA71-E ix
Contents
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 Verification ....................................................... 10-9
11. Using Accessories ................................................................... 11-1
12. Specifications........................................................................... 12-1

IM CA71-E 1-1
Functions
1
1. Functions
■Block Diagram
Constant current source
RJ detection circuit
Temperature
sensor
Reference voltage
V
V
mA
mA
mA
3Wire
3W
FUSE mA
Ω
Ω
Setting
Power supply circuit
AC100V
DC/DC converter
Measurement mode on/off switch
Power-on/off switch
Output on/off relay
Batteries
AC adapter
MEASURE Mode Section SOURCE Mode
Section
MEASURE
H
L
H
L
CPU
Shunt resistor
Multiplying
D/A
converter
A/D
converter Temperature
sensor
Overcurrent detection
Pulse source
Communication cable
SOURCE
Memory
Display
DIP switch
RJ INPUT
Ω
A/D
converter
Input
selector &
voltage
divider
Current-to-voltage conversion

1-2 IM CA71-E
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 Ωrange.
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.*1
RTD Sources resistance corresponding to the temperature de-
tected by a Pt100 or JPt100 RTD.*2
Frequency and pulse 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 defined by the frequency men-
tioned above.

IM CA71-E 1-3
Functions
1
•Measurement
Independent of the source function, the calibrator measures DC volt-
age, AC voltage, DC current and resistance signals, a temperature sig-
nal 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 Ωrange.
Thermocouple (TC) Measures temperature according to the type of thermo-
couple –K, E, J, T, R, B, S, N, L or U.*1(CA71 only)
RTD Measures temperature according to the type of RTD –
Pt100 or JPt100. *2(CA71 only)
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.
You can also select and configure the following functions.
Function Description
Divided output function( n/m )
Sources a “setpoint ×( n/m )”output signal, where the vari-
ables m and n are defined as m = 1 to 19 and n = 0 to 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
output in a step-by-step manner.
1. Functions

1-4 IM CA71-E
•Power Supply
The calibrator operates on AA-size (LR6) alkaline batteries or the op-
tional AC adapter.
*1: The thermocouples comply with the Japanese Industrial Standard JIS
C1602-1995 (ITS-90), except for the type-L and U thermocouples that com-
ply with DIN.
*2: The RTD comply with the Japanese Industrial Standard JIS C1604-1997
(ITS-90). The internal DIP switch can be configured so that the detectors
comply with IPTS-68 instead.
1. Functions

IM CA71-E 2-1
Names and Functions of Parts
2
2. Names and Functions of Parts
23
24
21
181910
12
13
22
20
6
7
5
3 4
1 98 17 152
11
16 14

2-2 IM CA71-E
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 mea-
sure DC voltage, AC voltage, resistance, and pulse signals.
4 DC Current Input Terminals
Serve as H (positive) and L (negative) input terminals when you mea-
sure a DC current signal. Also serve as L’terminals when you carry out
3-wire resistance measurement.
5 Three-wire Input Terminals
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.
•Ifyou have selectedthe FREQ range, usethis key to selectthe 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 ΩRTD 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.

IM CA71-E 2-3
Names and Functions of Parts
2
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 measure-
ment 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 ΩRTD 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 gen-
erated.
16 TEMP Key
Allows you to monitor temperature by selecting from the room tempera-
ture (°C), reference junction temperature (°C), thermocouple (mV) and
RTD (Ω) options.

2-4 IM CA71-E
17 n/m Key
Turns on/off the divided output function ( n/m ).
18 ▲and ▼ Output Setting Keys
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 overflow or underflow, allowing you to set the out-
put value without interruption. Holding down the ▲or ▼key continu-
ously changes the digit in 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 ▲and ▼keys are also used in the following ways:
•The ▲and ▼keys labeled
n and m serve as keys for setting the
variables n and m when you have selected the divided output func-
tion (
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.
■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.
2. Names and Functions of Parts

IM CA71-E 2-5
Names and Functions of Parts
2
2. Names and Functions of Parts
24 I/O Port Cover
Open this cover to connect the RS232 communication cable (P/N:
91017). (CA71 only)
bf
i jg h
c
d
e
a
l
k
■LCD Unit
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 mea-
surement.
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.
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 significant two digits “18”denote the value of
n , while the least
significant 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.