Omega CA450 User Manual

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User’s Manual

Model CA450

Process Multimeter

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1st Edition: Aug. 2012

M-5187

■ Registered Trademarks

“HART” is a registered trademark of the HART Communication Foundation.

■ About This Manual

• Every effort has been made to ensure accuracy in the preparation of this manual. However, should any errors or omissions come to the attention of the user, please contact

Omega Engineering.

• The contents of this manual are subject to change without prior notice because of improvement in performance or function.

Thank you for purchasing our

This user’s manual describes the specications and handling precaution for this Process

Multimeter.

Before using this Process Multimeter, thoroughly read this manual to get a clear understanding

proper use.

Always observe the following instructions. Failure to do so may impair the protection provided by the instrument and probes, and may result in electrical shock or other dangers that may lead to serious injury or the loss of life. Omega Engineering is in no way liable for any damage resulting from the user’s mishandling of the product.

Revision Information

st Edition: Aug. 2012

CA450 Process Multimeter

Regarding Safe Use of This Product

WARNING

CAUTION

Note

Tip

For safe use of this product, the following safety symbols are used on the product and manual:

This indicates that the operator must refer to an explanation in the instruction manual in order to avoid the risk of serious injury or the loss of life.

This indicates that the operator must refer to an explanation in the instruction manual in order to avoid the risk of injury or damage to the product.

This indicates information that is essential for handling the instrument or should be noted in order to familiarize yourself with the instrument’s operating procedures and/or functions.

This indicates supplemental information for explanations.

Danger! Handle with Care

This symbol indicates that the operator must refer to an explanation in the instruction manual in order to avoid risk of injury or death of personnel or damage to the instrument.

This symbol indicates double insulation or reinforced insulation.

This symbol indicates DC voltage/current.

This symbol indicates AC voltage/current.

This symbol indicates AC and DC.

This symbol indicates a fuse.

This symbol indicates a battery.

This symbol indicates ground (earth).

WARNING

■ Always observe the following instructions. Failure to do so may result in electrical shock or other dangers that may lead to serious injury or the loss of life.

Test Leads and Lead cables

•

Use the products provided by Omega Engineering for this device.

• Do not use degraded or damaged test leads or lead cables.

Check the continuity of the test leads and lead cables.

• When you attach or remove the test leads or lead cables or remove the case (for example to change the batteries), be sure to remove the lead cables from the circuit under measurement.

•

When you remove the case (for example to change the batteries), be sure to remove the test leads and lead cables from the instrument.

• There are caps at the ends of the test leads. To ensure safety (safety standard EN61010-031), be sure to put the caps on the leads when you use them.

Casing

not use the instrument if there is any damage to the casing or when the casing is

• Do removed.

Fuses

Use fuses of the specied rating when the fuse is replaced.

•

Operating Environment

•

Do not operate the instrument in an atmosphere where any ammable or explosive gas is

present.

void using the instrument if it has been exposed to rain or moisture or if your hands are

• A wet.

Disassembly

No person, the specied engineer, is authorized to disassemble this instrument.

•

Concernant l’usage en toute sécurité de ce produit

Avertissement

Attention

Remarque

Conseil

Symboles utilisés sur les appareils et dans le manuel d’instruction:

Indique un danger. Attire l’attention sur une utilisation quipourrait engendrer des accidents susceptibles de provoquer des blessures qui peuvent éventuellement s’avérer mortelles.

Indique un danger. Attire l’attention sur une utilisation qui pourrait engendrer une blessure personnelle et/ou être préjudiciable au produit.

Indique les informations essentielles à la manipulation de l’instrument ou qui doivent être prises en compte an de vous familiariser avec les procédures d’utilisation et/ou l es fonctions de l’instrument.

Ce qui suit indique des informations supplémentaires pour les explications.

Danger ! Manipuler avec soin.

Ce symbole indique que l’opérateur doit se reporter à une explicationdonnée par le

manuel d’instruction, an d’éviter tout accident susceptible de provoquer des blessures

au personnel qui peuvent éventuellement s’avérer mortelles, ou de protéger l’appareil.

Ce symbole indique une double isolation ou une isolation renforcée.

Ce symbole indique une tension/intensité C.C.

Ce symbole indique une tension/intensité C.A.

Ce symbole indique le C.A. et le C.C.

Ce symbole indique un fusible.

Ce symbole indique une batterie.

Ce symbole indique la masse (terre).

Avertissement

■ Les précautions suivantes doivent être prises. Dans le cas contraire,des accidents susceptibles de provoquer des blessures qui peuvent éventuellement s’avérer mortelles résultant de dangers tels que des chocs électriques, ou un préjudice au produit, risquent de survenir.

Fils de test et câbles de dérivation

Utilisez les produits fournis par Omega Engineering pour ce dispositif.

•

• N'utilisez pas de ls de test ou de câbles de dérivation dégradés ou endommagés.

Vériez la continuité des ls de test et des câbles de dérivation.

Lorsque vous xez ou retirez les ls de test ou les câbles de dérivation, ou que vous

•

enlevez le boîtier (par exemple pour changer les batteries), veillez à retirer les ls de test

et les câbles de dérivation du circuit en cours de mesure.

•

Lorsque vous enlevez le boîtier (par exemple pour changer les batteries), veillez à retirer

les ls de test et les câbles de dérivation de l'instrument.

•

Un chapeau est fourni sur le bout d’un l de test.

Utilisez un l de test avec le chapeau placé dessus pour une bonne sécurité (normes de

sécurité: EN 61010-031).

Boîtier

• N’utilisez est enlevé.

Fusibles

•

Utilisez les fusibles avec l’évaluation spéciée quand le fusible est remplacé.

Environnement d’opération

N’utilisez pas l’instrument là où un gaz ou de la vapeur (atmosphère) inammable ou

•

explosive quelconque est présente.

• Évitez sont humides.

Démontage

•

Aucune personne, excepté un ingénieur specialisé, n’est autorisée à démonter cet instrument.

pas l’instrument s’il y a un dommage quelconque au boîtier ou quand le boîtier

d’utiliser l’instrument s’il a été exposé à la pluie ou à l’humidité ou si vos mains

1. Overview .............................................................................................................8

2. Operating Environment .......................................................................................9

Specications ....................................................................................................11

3.1

General Specications ........................................................................... 11

3.2 Accuracy ................................................................................................ 13

4. Operation .......................................................................................................... 16

4.1

Precautions before Measurement ........................................................... 16

4.2 Components ........................................................................................... 17

.3 Measuring Instructions ...........................................................................21

4.3.1 AC Voltage Measurement ( , ) ...................................... 22

4.3.2 DC Voltage Measurement ( V, mV) .............................. 22

4.3.3 Measuring Using Sensors (SENSOR) .....................................22

4.3.4 Resistance Measurement (Ω) ................................................... 23

4.3.5 Continuity Check ( ) ............................................................ 24

4.3.6 Diode Test (

4.3.7 DC Current Measurement (

4.3.8 Loop Power Measurement ....................................................... 27

.3.9 Frequency Measurement (Hz) .................................................. 28

4.3.10 Auto Hold Function .................................................................29

4.3.11 Peak Hold Function .................................................................. 29

4.3.12 Relative Value Display (REL Δ/%) .......................................... 31

4.3.13 MIN/MAX/AVG Function ....................................................... 32

4.4 Output Instructions ................................................................................. 33

4.4.1 Constant Current Output (SOURCE mode) ............................. 34

4.4.2 Constant Current Output (SIMULATE mode) ......................... 36

4.4.3 Current Sweep Output .............................................................. 37

4.4.4 Current Span Setting ................................................................ 39

4.5 Auto Power-Off (Sleep) Function .......................................................... 39

) ........................................................................ 24

) .............................................. 26

4.6 Setup Function ....................................................................................... 40

.6.1 Turning the Buzzer On and Off ...............................................40

4.6.2 SENSOR Mode Input, Display, and Unit Settings .................. 41

4.6.3 Current Span Setting for the 100 mA

Range for DCmA Measurement ...............................................42

4.6.4 Setting the Slow Step Time ...................................................... 43

4.6.5 Returning the Settings to Their Factory Default Values .......... 43

4.7 Additional Power-on Functions .............................................................44

4.7.1 Making All the LCD Elements Appear .................................... 44

5. User Calibration Function ................................................................................. 45

.1 Calibrating Measurements ..................................................................... 45

5.1.1 Peak Hold Calibration .............................................................. 47

5.1.2 Loop Power Calibration ........................................................... 47

5.2 Calibrating Output ................................................................................. 48

5.3 What to Check after Calibration ............................................................ 50

6. Communication

6.1 Cable Connection and Interface Specications ..................................... 51

Communication Commands ................................................................... 52

6.2

6.3 Detailed Command Descriptions ...........................................................54

6.4 List of Errors ..........................................................................................72

6.5 Communication Command Validity Table ............................................. 73

6.6 Status Byte Format ................................................................................. 75

7. Replacing the Batteries and Fuses ....................................................................76

1 Replacing the Batteries .......................................................................... 76

7.2 Replacing the Fuses ............................................................................... 77

8. Calibration and After-Sales Service .................................................................. 78

Disposing This Product ..................................................................................... 78

9.1 Disposing This Product .............................................................................. 78

9.2

How to Replace and Dispose the Batteries ................................................ 79

10. Troubleshooting ................................................................................................ 80

Appendix

1 Fahrenheit ........................................................................................... 81

................................................................................................. 51

1. Overview

• Display

Main display: 5-digit LCD, Subdisplay: 5-digit LCD (Measured values other than current values are displayed with 4 digits.)

• Various Functions

Measurement Functions

voltage, AC voltage, DC current (24 V loop power supply possible), resistance,

DC frequency, continuity check, and diode test

Output Functions

current (constant output, current sweep output, and SIMULATE (SINK) function)

Additional Functions

Data hold (D•H); auto hold (A•H); peak hold (P•H); auto range (Auto); range hold

(Range

Hold); maximum, minimum, and average value recording and measurement; zero

adjustment (Ω); relative measured value display (RELΔ, REL%); and backlight

• Communication (Optional PC communication set required)

Measurement data can be transferred to a PC through the use of a USB communication

and a USB cable.

adapter

• Safety

Conforms to IEC 61010-1, Safety requirements for electrical equipment for measurement, control, and laboratory use. “Safety requirements for electrical equipment for measurement, control, and laboratory use” This instrument uses a current-input terminal shutter for preventing wrong input. This instrument uses high-performance UL-standard fuses.

2. Operating Environment

WARNING

Internal Wiring

Outlet

Entrance Cable

Fixed Equipment, etc.

Distribution Board

CAT. II

Equipment

CAT.I

CAT.IV

CAT. III

■ Measurement Category of CA450 and Lead cables

There are restrictions on the maximum voltage level at which the CA450 can be used.

These restrictions are based on the measurement categories specied by the safety

standards.

AC/DC 1000 V for CAT.III, AC/DC 600 V for CAT.IV

The terminals for current

all under category I.

Do not use the above terminals and lead cables for measuring points that fall under

measurement categories II, III, or IV.

■ Category of Test leads

With Caps: 1000V 10A CAT.III/600V 10A CAT.IV Without Caps: 1000V 10A CAT.II/600V 10A CAT.II

easurement and output and the accessory

lead cables

Measurement

3.2 Accuracy

Standard test conditions

(1) Ambient temperature: 23°C ± 5°C

(2) Relative humidity: 45% to 75% RH (no condensation)

(3) Orientation: Horizontal or standing

(4) External magnetic elds: Terrestrial magnetic eld only

* Each of the response times indicates the time it takes for the accuracy to fall within the

specied range.

Accuracy: ± (% of reading + digits)

DC Voltage Measurement V, mV

Range Resolution Accuracy Input Resistance

mV 0.1 mV 0.09% + 2 10 MΩ or more

600

6 V 0.001 V

V 0.01 V

V 0.1 V

1000 V 1 V 0.1% + 1

NMRR: 60 dB or more, 50/60 Hz ± 0.1%

CMRR: 120 dB or more, 50/60 Hz (Rs = 1 kΩ)

Response

AC Voltage Measurement V, mV

AC coupling, rms value detection: sine wave

For a range of 5 to 100%, the accuracy for the 1000 V range is 200 V to 1000 V CMRR: 60 dB or more, DC to 60 Hz (Rs = 1 kΩ) For nonsinusoidal waveforms whose crest factor is less than 3, add ±(2% of reading + 2% of range)

t For the 1000 V range, the peak voltage is 1500 V or less Response time: Within 2 seconds

time: Within 1 second

Range Resolution

600 mV 0.1 mV

6 V 0.001 V Approx. 11 MΩ, <50 pF

V 0.01 V V 0.1 V

1000 V 1 V —

o the accuracy.

0.09% + 1

Accuracy

0/60 Hz

0.5% + 5 1% + 5

40 Hz to

500 Hz

Approx. 11 MΩ

Approx. 10 MΩ600

500 Hz to

1 kHz

1.5% + 5

Impedance

10 MΩ or more, <200 pF

Approx. 10 MΩ, <50 pF600

Maximum Input

Input

Voltage

000 VDC

1000 Vrms AC

Maximum

Voltage

000 VDC

1000 V rms AC

Input

DC Current Measurement

Range Resolution Accuracy Voltage Drop 30 mA 0.001 mA 0.05%+2 < 0.3 V

00 mA*1 0.01 mA 0.05% + 2 < 0.8 V

*1 Only the 30 mA range can be used during LOOP POWER output.

Response

Resistance Measurement Ω

time: Within 1 second

Range Resolution Accuracy

Maximum Measuring

Current

Open-Loop

Voltage

600 Ω 0.1 Ω 0.2%+2 <1.2 mA <3.5 V

6 kΩ 0.001 kΩ

60 kΩ 0.01 kΩ <13µA

0.2%+1*1

600 kΩ 0.1 kΩ <1.3µA

6 MΩ 0.001 MΩ 0.35%+3

60 MΩ 0.01 MΩ 1%+2 *2

1 The accuracy after ZERO CAL

<110µA

<1.3 V

<130 nA

*2 For 40 MΩ to 60 MΩ, the accuracy is 2% + 2. Response time: Within 2 seconds for 600 Ω to 600 kΩ,

within 10 seconds for 6 MΩ to 60 MΩ

Continuity Check

Range Resolution Operating Range

The

buzzer sounds at

600 Ω 0.1 Ω

resistances lower than

Measuring

Current

<1.2 mA < 3.5 V 1000 Vrms

Open-Loop

Voltage

50 ± 30 Ω.

Input

Protective

Voltage

000 Vrms

Input Protective

Voltage

Diode Test

Range Resolution Accuracy

V 0.001 V 1% + 2

Measuring

Current (Vf = 0.6 V) Approx.

0.5

Open-Loop

Voltage

<3.5 V 1

Input Protective

Voltage

000 Vrms

Frequency Measurement in Hz AC Coupling

Range Resolution Accuracy Input Voltage Range

10.00 Hz to 199.99 Hz 0.01 Hz

90.0 Hz to 1999.9 Hz 0.1 Hz

0.005% + 1

3 to 600 Vrms

0.900 Hz to 19.999 kHz 0.001 kHz 0.4 to 600 Vrms

Peak Hold (P•H)

Measurement Function Accuracy Minimum Detection Width

DCV ±100 digits >6

DC Output

Range Resolution Accuracy Load Condition

SOURCE

0 to 20 mA

Compliance voltage 28 V

20 mA 0.001 mA 0.05% of range

SIMULATE (SINK) 0 to 20 mA

External power supply 15 to 48 V overrange up to 25 mA

< 10 mH

24 V Loop Power Supply (LOOP POWER)

Range Load Condition

24 V 24 VDC (typ.), load current 20 mA

4. Operation

CAUTION

4.1 Precautions before Measurement

■ Checking the Contents of the Package

After receiving the product and opening the package, check the items described below. If the wrong items have been delivered, if items are missing, or if there is a problem with the appearance of the items, contact your nearest Omega Engineering.

■ Operation and Storage Precautions

• When inserting the batteries into the instrument, refer to section 7.1, “Replacing the Batteries.”

• There is a blank cover on the upper part of the back casing.

Only remove it when connecting the USB adapter of the communication package (sold

separately).

•

Do not use the instrument near devices that produce high levels of noise or in areas subject to sudden changes in temperature. Doing so may result in unstable readings and errors.

Cleaning

•

Do not wipe the instrument using benzine, paint thinner, or any other solvent (chemical).

Doing so may lead to discoloration and other problems. Use a dry cloth to clean the instrument.

Storage

•

Do not leave the instrument exposed to direct sunlight or in a hot and humid location,

such as the inside of a vehicle, for a signicant length of time.

If you do not intend to use the instrument for a signicant period of time, remove its

•

batteries.

4.2 Components

Display (LCD)

SHIFT key MIN/MAX key RANGE key HOLD key

LIGHT key SELECT key

RELΔ/% key

Hz key

Function switch

Input and output terminal area

Red

Caps of Test leads

Black

With Caps: 1000V 10A CAT. /600V 10A CAT. Without Caps: 1000V 10A CAT. /600V 10A CAT.

70 VDC100 mA CAT.

• Panel description • Test leads

• Lead cables

1) Function switch Use this switch to turn the power on and off and to select the measurement mode.

Function Mode Function Mode

OFF T

V / Hz

V DC voltage measurement

mV / mV

SENSOR

Ω /

If test leads or lead cables are connected to the current measurement and output terminals, you cannot turn the function switch to the OFF position.

SELECT key

By pressing this key, you can select different measurement modes when the function switch is at the positions listed below. You can switch out of the selected mode by pressing the key again.

mV/ mV position: AC voltage mV measurement

(AC SENSOR measurement in SENSOR mode)

Ω position: Diode test

LOOP POWER position: The SELECT key turns the internal series resistor for HART

position: Operation mode ( / and / ) switching

urns the CA450 off. Continuity check AC voltage measurement and frequency measurement

DC/AC

voltage measurement in mV and various SENSOR modes Resistance measurement Diode test LOOP POWER

communication on and off.

OUT

PUT

DC current measurement

DC current output Constant current output

DC current output Current sweep output

DC current measurement Loop power supply

3) RANGE key Use this key to select the measurement range. Fixed range: “Range Hold” appears on the display. The range increases each time you press RANGE. AUTO range: “AUTO” appears on the display. To select AUT

4) HOLD key Use this key to hold the measured values.

Press HOLD to switch between data hold, auto hold, peak hold, and no hold (release).

(Hold modes that are not supported for the selected measurement function are skipped.)

O range, hold down RANGE for 1 second or longer.

Data hold: The currently displayed measured values are held. “D•H” appears on

the display.

Auto hold: The measured values are automatically held according to the

operation of the test leads. “A•H”

Peak hold: The peak values are held. “P•H” appears on the display.

5) LIGHT key

Use this key to turn the backlight on and off. Press the key once to turn it on. Press it again

to turn it off. Use this key to control the sleep function. During measurement or output, Hold down LIGHT for 2 seconds or longer to put the CA450 in sleep mode. (While the CA450 is in sleep mode, hold down the LIGHT key for 2 seconds or longer to clear sleep mode.) (You cannot clear sleep mode immediately after the CA450 is put in sleep mode. Wait at least 2 seconds after the CA450 is put in sleep mode before you clear it.)

6) RELΔ/% key

Use this key to display the measured values as relative values (you can display the differences between values using numbers or percentages).

1: Difference display (RELΔ) “Δ” appears on the display. 2: Percentage difference display (REL%) “Δ” and “%” appear on the display.

Use this key during the zero adjustment of the resistance measurement function. With the test leads shorted, press the REL key to execute zero adjustment.

7) MIN/MAX key Use this key to display the minimum (MIN), maximum (MAX), and average (AVG) values within the measurement period. When you press the key, recording starts, and “MIN,” “MAX,” and “AVG” appear on the display. (The AUTO OFF function is disabled.) When peak hold is enabled, press the REL

key to reset the peak value.

8) Hz key When the function switch is turned to ~V, use this key to switch between AC voltage measurement and frequency measurement.

Use this key in calibration mode to conrm the calibration value.

9) SHIFT key If you press SHIFT while a measurement mode is selected, “Shift” appears on the display.

In this state, you can congure various settings by pressing the various keys.

SHIFT+ LIGHT key SETUP mode

SELECT key Switches from mV mode to SENSOR mode

While an output mode is selected, press SHIFT to switch between SOURCE and SIMULATE.

appears on the display.

Display (LCD) Description

Symbol or Unit Description

Appears during DC measurement or output Appears during AC measurement

Appears when the polarity is negative (minus) Appears during diode test mode

Appears during continuity check mode Appears when relative values are being displayed

Indicates that the measurement range is set to xed

Indicates that the measurement range is set to auto Indicates the present range Appears when data hold is enabled Appears when auto hold is enabled Appears when peak hold is enabled Appears when the MIN, MAX, and AVG values are being measured Appears when the MAX value is being displayed Appears when the MIN value is being displayed Appears when the AVG value is being displayed Appears when user calibration is being performed Appears when the auto power-off function is enabled Appears during rms value detection Appears when SHIFT has been pressed Shows the main value Shows the input or output value A converted value is shown in SENSOR mode

Indicates the main unit

Indicates the subunits Shows the MIN, MAX, and AVG recording time Shows the input voltage unit in SENSOR mode Shows the subvalue Shows the MIN, MAX, and AVG recording time Shows the reference value during relative calculation

Appears when the range has been exceeded

WARNING

Appears when the battery voltage is low Appears during current output

Appears during fast linear output

Appears during slow step output Appears during fast step output

Shows the current sweep output or step output status Appears during slow linear output

Appears in loop power supply mode Appears when the internal resistor for HART communication is on

Appears in SPAN check mode

Appears when the SIMULATE operation is being performed Appears in SENSOR mode

4.3 Measuring Instructions

To avoid damaging the instrument and other equipment:

• Before you start measuring, make sure that the position of the function switch and position of the input terminals for connecting the test leads or lead cables are appropriate for the desired mode of measurement.

that they are appropriate for the measurement category.)

(Check

• Before you turn the function switch, remove the test leads or lead cables circuit under measurement.

• Before you use this instrument or use its indications as a reference for further procedures, make sure that the instrument functions properly when used with a known power supply.

from

the

4.3.1 AC Voltage Measurement (

Black Red

Test leads

Black Red

Test leads

Note

, )

1) Turn the function switch to the “

2) If you turned the function switch to “mV,” press SELECT. (“~” is displayed.)

3) Insert the test leads into the input terminals.

4) Connect the test leads to the circuit under measurement, and then read the value when it stabilizes.

4.3.2 DC Voltage Measurement ( V, mV)

1) Turn the function switch to the “

2) Insert the test leads into the input terminals.

3) Connect the test leads to the circuit under measurement, and then read the value when it stabilizes.

If the

to a circuit, the instrument will still display a value, but measurement will not be adversely affected.

4.3.3 Measuring Using Sensors (SENSOR)

You can use this function to measure the output of a current sensor or other type of sensor that converts its measured values into voltages, to convert the voltages into the original measured values, and to display the converted values.

Before you perform measurement, you need to congure unit, conversion, and other

See “SENSOR Mode Input, Display, and Unit Settings” in section 4.6, “Setup

settings. Function.”

1) Turn the function switch to the “mV” position.

2) Press SHIFT+SELECT to switch to DC SENSOR mode.

To switch to AC SENSOR mode, press SELECT again. The input voltage appears in the subdisplay. In the main display, the value converted

using the settings congured in “SENSOR Mode Input, Display, and Unit Settings” in

section 4.6 appears.

range setting is selected and the test leads are not connected

V” or “mV” position.

DC SENSOR range AC SENSOR range

SENSOR

3) Connect the sensor that you will use to the input terminals.

CAUTION

Black Red

Test leads

4) Read the value when it stabilizes.

To return to normal mV measurement, press SHIFT+SELECT again.

Example of measurement when connecting a current clamp sensor with an input-to-output ratio of 10 mV/A

Use the setup function (see section 4.6) to congure the following settings.

Instrument input voltage: 10.0 (mV) Converted value, decimal place: 01.00 Unit: A

If you connect the sensor after conguring the above settings, the current clamp sensor’

s output voltage (in mV) appears in the subdisplay, and the current detected by the current clamp sensor appears in the main display. (You can read the values directly.)

4.3.4 Resistance Measurement (Ω)

To avoid damaging the instrument:

Before measurement, turn off the circuit under measurement so that no voltage is

applied.

Turn the function switch to the “Ω” position.

2) Insert the test leads into the input terminals.

3) Connect the test leads to the circuit under measurement, and then read the value when it stabilizes.

Note

Zero adjustment for resistance

CAUTION

Black Red

Test leads

CAUTION

Black Red

Test leads

We recommend that you perform zero adjustment to obtain accurate measurements. After you perform steps 1 and 2 above, short the test leads, and press the REL key.

(When zero adjustment is performed, the instrument will show a reading of 0.0 Ω.)

The zero adjustment value is used until the power is turned off.

4.3.5 Continuity Check (

To avoid damaging the instrument:

Before measurement, turn off the circuit under measurement so that no voltage is applied.

) Turn the function switch to the “

2) Insert the test leads into the input terminals.

3) Connect the test leads to the circuit under measurement whose continuity you want to check.

If the circuit is continuous (less than approximately 50Ω),

the buzzer sounds.

4.3.6 Diode Test ( )

To avoid damaging the instrument:

Before measurement, turn off the circuit under measurement so that no voltage is applied.

Turn the function switch to the “Ω” position.

Press SELECT to switch to diode measurement.

(

is displayed.)

2) Insert the test leads into the input terminals.

3) Connect the test leads to the diode, and then read the value when it stabilizes.

)

” position.

Forward-Bias Diode Test

Black Red

Figure 1 Forward-bias test

Test leads

Red Black

Figure 2 Reverse-bias test

Test leads

the black test lead to the cathode, and connect the red test lead to the anode.

Connect For a silicon diode, the reading should be approximately 0.5 V. For an LED, the reading should be approximately 1.5 V to 2.0 V.

Reverse-Bias Diode Test

the black test lead to the anode, and connect the red test lead to the cathode.

Connect Normally, “OL” appears. If a voltage value appears, the diode is defective.

4.3.7 DC Current Measurement (

WARNING

30 mA range

Main display

Subdisplay (percentage of span)

When the range is 4 to 20 mA

100 mA range

Main display

Subdisplay (percentage of span)

When the range is 10 to 50 mA

BlackRed

Test leads

To avoid damaging the instrument and other equipment:

• Before

you start measuring, make sure that the position of the function switch and

position of the input terminals for connecting the test leads are appropriate for the desired mode of measurement.

The maximum input current for mA measurement is 110 mA.

)

1) Turn the function switch to the “

2) Connect the black test lead to the COM input terminal, and connect the red test lead to the input terminal.

3) Connect the test leads to the circuit under measurement, and then read the value when it stabilizes.

Press the RANGE key to select a range.

Subdisplay: Displaying and Conguring the Span

In addition to the DC current value in the main display, you can also display the span value as a percentage in the subdisplay.

Subdisplay for the 30 mA Range

Input Current Value

(Main display)

-33.000 mA mA -25.0% 0.0%

The section 4.4.4, “Current Span Setting.”

0.000 .000 mA 0.0% 20.0%

mA 100.0% 100.0%

20.000

0.000 mA 162.5% 200.0%

.000 mA 181.3% 165.0%

displayed value varies depending on the setting (4 to 20 mA or 0 to 20 mA) made in

” position.

Subdisplay for the 30 mA Range

4 to 20 mA 0 to 20 mA

-231.3% -165.0%

Subdisplay for the 100 mA Range

Transmitter (signal conditioner)

Distributor

LOOP POWER

Two-wire system transmitter

4 to 20 mA

Red Black

Input Current Value

(Main display)

-110.00 mA -110.0% -300.0% -220.0%

0.00

mA 0.0% -25.0% 0.0%

0.00 mA 10.0% 0.0% 20.0%

0.00 mA 50.0% 100.0% 100.0%

00.00 mA 100.0% 225.0% 200.0%

10.00 mA 110.0% 250.0% 220.0%

The

displayed value varies depending on the setting (0-100mA, 10-50mA, or 0-50mA) made in

section 4.6, “Setup Function.”

4.3.8 Loop Power Measurement

You can use this function to measure the current that ows when a constant voltage of 24 VDC

applied.

is 24 V loop measurement can be used for transmitter loop testing. (You can connect the CA450 to the transmitter instead of connecting a transmitter or signal conditioner.)

0 to 100 mA 10 to 50 mA 0 to 50 mA

Subdisplay for the 100 mA Range

1) Turn the function switch to the “

Tip

Black Red

Test leads

Tip

(“LOOP POWER” appears on the display.) A constant voltage of 24 VDC is output between the “SOURCE(+)” and “SOURCE(-)”

measurement terminals.

2) Connect the red test lead to “SOURCE(+)” and the black test lead to “SOURCE(-).”

3) Connect the test leads to the circuit under measurement, and then read the values when they stabilize.

Just as in mA measurement, the main display shows the measured value, and the

subdisplay shows the value of the measured value divided by the current span times 100

(%). (See chapter 4.3.7.)

Press SELECT to turn the internal 250 Ω series resistor for HART communication on.

(“250ΩHART” appears on the display.) Press SELECT again to turn the internal resistor

off.

The loop power is supplied at the typical value of 24 VDC. Depending on different

conditions, such as the loop current value or whether there is a internal series resistor, the voltage across the terminals may be greater than 24 V.

4.3.9 Frequency Measurement (Hz)

1) Turn the function switch to the “~V “ position.

2) Press the Hz key to select frequency measurement.

(The measured frequency value and unit appear in the

main display, and the measured voltage appears in the subdisplay.)

) Insert the test leads into the input terminals.

4) Connect the test leads to the circuit under measurement, and then read the values when they stabilize.

LOOP POWER” position.

Note that range hold and selection operations performed using the Range key only

apply to the subdisplay (measured voltages).

4.3.10 Auto Hold Function

Note

The CA450 can automatically detect measured values and hold them according to the operation of the test leads.

1) During normal measurement, press the HOLD key twice to select “A•H.” (“A•H”

appears on the display.)

2) Connect the test leads to the circuit under measurement.

3) When the measured value stabilizes, the buzzer makes a beeping sound.

4) Remove the test leads from the circuit under measurement.

5) The measured value display is held down.

While “A•H” is displayed, you can repeat steps 2 through 4 as often as you want.

• You cannot use this function during DCmV or ACmV measurement (this includes SENSOR mode), frequency measurement, or during a continuity check.

• You cannot use this function at the same time as the relative value display function or when the MIN, MAX, and AVG values are being recorded.

• Unstable input signals (measured values) cannot be held.

4.3.11 Peak Hold Function

The CA450 always detects and updates the instantaneous peak value during DC voltage measurement (DCV). You can determine the peak value of a waveform.

1) Set the function switch to

2) Connect the test leads to the circuit under measurement.

3) Press the HOLD key three times to select “P•H.” (“P•H” appears on the display, and the voltage range is xed.)

) The peak value display is held.

5) You can reset the held peak value by pressing the MIN/MAX key. You can hold a new peak value.

Note

• Even if the polarity of the input signal (DCV) is negative (minus), as long as the peak (change) direction is positive, the peak value can be measured.

• While the peak value is being measured, you can display relative values based on a measured reference value.

1) Press the REL Δ /% key while the peak is held. (“Δ” is displayed.)

Main display value: The current peak value – the peak value when the

REL key was pressed

2) Press the REL Δ /% key again. (The unit changes to ‘%’.)

Main display value: (The current peak value – the peak value when the

REL key was pressed) /the peak value when the REL key was pressed × 100 (%)

To no longer show relative values, press REL Δ /% again.

The “Δ” and “%” display disappear, and the CA450 returns to the normal peak

hold mode.

• You can reset the peak value by pressing MIN/MAX.

You can hold a new peak value.

4.3.12 Relative Value Display (REL Δ/%)

The CA450 can calculate and display relative values that represent the difference or percentage from a reference value.

(In this display, the range is xed.)

Difference Display (REL Δ)

The

CA450 shows the value of the measured value minus the reference value.

1) Measure

2) Press REL Δ/% to conrm the reference value. (“Δ” is displayed, and the range is held.)

3) Measure (input) the measured values. The displayed values vary depending on the

Percentage Difference Display (REL%)

The CA450 computes the value of (Measured value – reference value)/reference value and

displays

1) Measure (input) the reference value.

2) Press REL Δ/% to conrm the reference value. (“Δ” is displayed, and the range is held.)

3) Press REL Δ /% again. (“%” appears.)

4) Measure (input) the measured values. The displayed values vary depending on the

(input) the reference value.

measurement function.

• For DCmA measurement (including loop power measurement):

Main display value: Measured value – reference value

Subdisplay value: (Measured value – reference value)/current span

setting × 100 (%)

• For measurement types other than DCmA: Main display value: Measured value – reference value Subdisplay value: Reference value

the result as a percentage.

measurement function.

• For DCmA measurement (including loop power measurement): Main display value: (Measured value – reference value)/current span

setting × 100 (%)

Subdisplay value: Reference value

• For measurement types other than DCmA: Main display value: (Measured value – reference value)/reference

value × 100 (%)

Subdisplay value: Reference value

4.3.13 MIN/MAX/AVG Function

Note

You can use this function to display the minimum (MIN), maximum (MAX), and average (AVG) values within the current measurement period.

(In this display, the range is xed.)

The

averaged value that is displayed is the total of the recorded data divided by the number of recorded values. When you press the MIN/MAX key, recording starts, and “MIN,” “MAX,” and “AVG” appear on the display. (The AUTO OFF function is disabled.)

Recording Time

The

timer starts, and the time from the start of recording is displayed as well as the MIN/ MAX record update time. The recorded time display shows times in the range of 0 seconds to 99 minutes, 59 seconds in units of seconds. It shows times greater than 100 minutes in units of minutes. To stop recording, press the HOLD key. (“D•H” appears on the display.)

Checking the Recording Time

ou can check the recorded data by pressing the MIN/MAX key to switch between the

Y display of the current maximum (MAX), minimum (MIN), and average (AVG) values. To restart recording, press the HOLD key again. To disable the MIN/MAX/AVG function, hold down MIN/MAX for 1 second or longer. (“MAX,” “MIN,” and “AVG” disappear.)

• While recording is stopped, removing the test leads does not affect the recorded data.

• When an out-of-range input value is recorded, the minimum or maximum value is displayed as “OL,” and the average value data becomes inaccurate.

• When you are measuring a widely uctuating signal, set the range to contain the

maximum and minimum values so that these values are not displayed as “OL.”

4.4 Output Instructions

WARNING

CAUTION

The CA450 can output DC current. There are two output modes. SOURCE mode: Current is supplied from the CA450. SIMULATE mode (SINK): The CA450 sinks current from an external voltage

source.

There are two conguration modes. Constant current output: The specied current is output continuously.

Current sweep output: The output current is increased and decreased

within the specied span.

Do not apply a voltage of 48 V or greater to the output terminals. Doing so may lead to electric shock.

Also, keep the voltage between the circuit and the ground below 48 V. Always use the attached lead cables and lead cables.

that they are appropriate for the measurement category.)

(Check

In modes other than SIMULATE mode, do not apply voltages to the output terminals. Mistakenly applying voltage to the output terminals could damage the internal circuitry.

If the batteries.

mark appears while you are using the current output function, replace the

4.4.1 Constant Current Output (SOURCE mode)

BlackRed

Lead cables

Tip

1) Turn the function switch to the “

” position.

After you turn the function switch, “OUTPUT” appears on the screen, and the output is

set to 0% of the current span setting.

(If you turn the function switch from the “

” (current sweep) position to the “ ”

position, the output value setting and SOURCE/SIMULATE setting are retained.)

2) If “SIMULATE” is displayed, press the SHIFT key. (“SIMULATE” disappears, the CA450 switches to SOURCE mode, and current output

starts.)

Connect the lead cables to the positive (+) and negative (–) SOURCE terminals.

4) Use the output value setting keys to set the output value.

Output Value Setting Key

%STEP

Output Setting (Increase and decrease)

▲ 1-step (25%) increase ▼ 1-step (25%) decrease

COARSE ▲ 0.

FINE ▲ 0.00

▼ 0.

▼ 0.00

1 mA increase 1 mA decrease

* For details about using the %STEP key, see “Output

Values for Each Step” and “Span Check Mode.”

5) Connect the lead cables to the circuit under test.

• Because the CA450 outputs current in SOURCE mode, it consumes more current than in other modes. You can keep the current consumption down in SIMULATE mode.

• Hold down the %STEP

, COARSE, or FINE key to increase or decrease

each digit consecutively.

Output Values for Each Step

You can press %STEP▲ or %STEP▼ to increase or decrease the output by one step (25%).

ou can check the step value (as a percentage) in the subdisplay. (The output current

Y appears in the main display.)

Step

When the range is 4 to 20 mA

Tip

(Subdisplay)

-25% 0.000 0% 4

25% 8.000 50% 1

75% 1 100% 20.000 125% — 2

131.2% 2

For the method for setting the current span, see section 4.4.4, “Current Span Setting.”

Span Check Mode

ou can switch the output current between 20 mA and 4 mA (or 20 mA and 0 mA) using

just the %STEP keys.

When you hold down %STEP▲ or %STEP▼ for 1 second or longer, “SPAN” appears, and

the CA450 enters into span check mode.

In this mode, the output switches to 100% when you press %STEP▲ and to 0% when you press %STEP▼.

Setting Key Output Setting

▲ 20.000 mA (100%)

%STEP

The COARSE (0.1 mA increase and decrease) and FINE (0.001 mA increase and decrease) keys can also be used.

To exit span check mode, hold down %STEP▲ or %STEP▼ for 1 second or longer again. (“SPAN” disappears.)

▼

4 to 20 mA 0 to 20 mA

.000 mA 0.000 mA

2.000 mA 10.000 mA

6.000 mA 15.000 mA

5.000 mA —

to 20 mA

4.000 mA (0%)

Output Value

mA —

mA 5.000 mA

mA 20.000 mA

5.000 mA

to 20 mA

0.000 mA (0%)

• If the set current is 0.1 mA or more and the terminals are open, “-----” appears in the main display, and “----” appears in the subdisplay.

4.4.2 Constant Current Output (SIMULATE mode)

CAUTION

Transmitter (signal conditioner)

Distributor

SIMULATE

(SINK)

Two-wire system transmitter

4 to 20 mA

Black

Red

When the SIMULATE (SINK) function is enabled, the CA450 can sink the specied amount of current from an external voltage source (such as a distributor) through the SIMULATE(+)

terminal,

and you can use the CA450 to simulate a two-wire system transmitter in a loop test.

(You can connect the CA450 instead of a transmitter to test a transmitter or signal conditioner.)

• When sinking 20 mA from an external power source, keep the voltage within the range of 15 to 48 V.

• Set the polarity of the applied voltage as shown in the gure below, and be careful not

to apply voltage in the opposite direction.

1) Turn the function switch to the “ ” position.

After you turn the function switch, “OUTPUT” appears on the screen, and the output is

set to 0% of the current span setting.

(If you turn the function switch from the “

2) Press the SHIFT key. “SIMULATE” appears. (Current sinking starts.)

output value setting and SOURCE/SIMULATE setting are retained.)

” position to the “ ” position, the

3) Connect the lead cables to the positive (+) and negative (–) SIMULATE terminals.

Tip

(Connect the positive SIMULATE terminal to the positive terminal of the external DCV

power source. Make sure that the power source voltage is within 15 to 48 V.)

4) Just as in SOURCE mode, use the output setting keys to set the sink current value.

(To enter span check mode, hold down %STEP▲ or %STEP▼ for one second or

longer.)

) Connect the lead cables to the circuit under test.

Press the SHIFT key again. “SIMULATE” disappears, and the CA450 returns to constant

current output (SOURCE) mode.

• If the set current is 0.1 mA or more and the terminals are open, “-----” appears in the main display, and “----” appears in the subdisplay.

4.4.3 Current Sweep Output

You can make the output current (in SOURCE or SIMULATE mode) automatically uctuate between 0% and 100% of the current span setting.

1) Turn the function switch to the “

After you turn the function switch, “OUTPUT” appears on the screen, and the output

starts rising from 0% of the current span setting.

(If you turn the function switch from the “

output value setting and SOURCE/SIMULATE setting are retained.)

2) Press the SHIFT key to select the current output mode (SOURCE or SIMULATE).

3) Press the SELECT key to select an output mode.

(When you change the output mode, the current starts rising from the value currently

being output according to the new mode.)

4) After you connect the lead cables to the appropriate terminals for the output mode (SOURCE or SIMULATE), connect them to the circuit under test.

• If you want to stop a current sweep that is being output, turn the function switch to “ being output when the switch is turned.)

.” (The constant current output value is set to the value of the current

” position.

” position to the “ ” position, the

Operation Mode Operation

Output current

Span

(%)

100

Time (s)

4015

SlowFast

Output current

Span

(%)

100

Slow: 15 to 60 s* Fast: 5 s

Time (s)

Tip

Slow

Fast

Slow

Fast

Linear Mode Current Output

Step Mode Current Output

0% to 100% to 0% in 40 seconds

0% to 100% to 0% in 15 seconds

0% to 100% to 0% in 25% steps

step is 15 to 60 seconds long.*

Each

0% to 100% to 0% in 25% steps

step is 5 seconds long.

Each

* In slow step mode, you can select 15, 30, 45, or 60 seconds. See section 4.6.4, “Setting the Slow Step Time.”

4.4.4 Current Span Setting

You can select one of the following two current spans. The following two percentage displays vary depending on the selected range: the output current value and the measured current value for mA measurement mode in the 30 mA range.

Current Span Setting

to 20 mA 4.000 mA 20.000 mA Factory default

4 0 to 20 mA 0.000 mA 20.000 mA —

You can use the following method to set (change) the current span.

1) Turn the function switch to the “OFF” position, or put the CA450 into sleep mode.

2) While holding down the RANGE key, turn the function switch to any position. If or longer.

3) After all the LCD elements appear and then disappear, release the key.

4) After setting the current span, turn the function switch to the "OFF" position, or put the CA450 into sleep mode. If the current span was set to 4 to 20 mA, this operation changes it to 0 to 20 mA. If the current span was set to 0 to 20 mA, this operation sets it to 4 to 20 mA. The setting you make remains valid until you change it.

Output Current and Measured Current (30 mA range) Notes

When the display is 0% When the display is 100%

the CA450 is in sleep mode, hold down the RANGE and LIGHT keys for 2 seconds

4.5 Auto Power-Off (Sleep) Function

When the Auto Power-Off Function Is Enabled

“AUTO OFF” appears.

• The CA450 has an auto power-off function that automatically switches itself to sleep mode 20 minutes after the last key operation.

The buzzer makes a beeping sound approximately 30 seconds before the CA450 enters

sleep mode. (This period is referred to as the warning period.)

• If you press a key or switch during the warning period, the time before auto power-off is extended. You can clear sleep mode by turning the function switch to the OFF position, waiting 1

• second or longer, and then turning the switch to any position other than OFF. (You can also hold down the LIGHT key for 2 seconds or longer to clear sleep mode.

When the Auto Power-Off Function Is Disabled

) Turn the function switch to the “OFF” position, or put the CA450 into sleep mode.

2) While holding down HOLD, turn the function switch to any position. the CA450 is in sleep mode, hold down the HOLD and LIGHT keys for 2 seconds or

If longer. The auto power-off function is disabled, and “AUTO OFF” disappears.

Restoring the Auto Power-Off Function

Note

the function switch is set to OFF or when the CA450 enters sleep mode, the auto

When power-off function is restored. (When the power is turned on or when sleep mode is cleared, “AUTO OFF” appears.)

4.6 Setup Function

You can use the setup function to:

1 Turn the buzzer on and off.

2 Congure SENSOR mode input, display, and unit settings.

3 Set the current range of the 100 mA range for DCmA measurement. 4 Set the slow step time. 5 Return the settings to their factory default values.

1) Press the SHIFT key. “Shift” appears on the display.

2) While “Shift” is displayed, press the LIGHT key to switch to setup mode. After “SEtUP”

appears, the screen for turning the buzzer on and off appears.

3) The setting to congure changes each time you press the LIGHT or SHIFT key.

4) To change a setting, use the ▲ (RANGE) and ▼ (REL) keys.

5) To save (conrm) a setting, press the HOLD key. (“SEt” appears, the setting is saved,

and the setting item is redisplayed.)

6) To return to normal measurement from setup mode, hold down the LIGHT key for 1

second or longer.

• To cancel a setting, press the LIGHT key for 1 second or longer without pressing the HOLD key, or use the function switch to turn the power off.

• You cannot enter setup mode from one of the current output modes (constant current output or current sweep output mode).

4.6.1 Turning the Buzzer On and Off

You can turn the buzzer (beeping) sound on and off. Even if you turn the buzzer off, it will sound when it is performing important functions such as those listed below.

• Continuity check buzzer

• Excess input alarm buzzer

• Auto power-off warning buzzer

1) Press the LIGHT or SHIFT key to display “bEEP.”

HOLD

:ON :OFF

Main display 1

Subdisplay 1Subdisplay 4

Main unit

Main decimal place

Main display 4

(Turn the buzzer on and off in the subdisplay. The initial setting is on.)

2) Use the ▲ (RANGE) and ▼ (REL) keys to select ON or OFF.

3) Press the HOLD key to save the setting.

(After “SEt” appears, “bEEP” will appear again.)

4) To return to normal measurement from setup mode, hold down the LIGHT key for 1 second or longer.

4.6.2 SENSOR Mode Input, Display, and Unit Settings

For SENSOR mode (mV position on the function switch), you can set the input voltage and the corresponding main display and unit for that input voltage.

1) Press the LIGHT or SHIFT key to display the screen shown below. The parameter that

can be changed blinks.

Keep pressing the LIGHT key to switch between the following parameters. Subdisplay 4, subdisplay 3, subdisplay 2, subdisplay 1, main display 4, main display 3,

(You can press the SHIFT key to switch parameters in the opposite direction.)

2) Use the ▲ (RANGE) and ▼ (REL) keys to set the various values, the decimal place,

3) Press the HOLD key to save the settings. (After “SEt” appears, the setting screen will

4) To return to normal measurement from setup mode, hold down the LIGHT key for 1

main display 2, main display 1, main decimal place, and main unit

and the unit.

appear again.)

second or longer.

Settings

1 A

10 mV

66 A

660 mV

Display

Input

HOLD

Subdisplay value: 000.0 to 999.9 Main display value: 0000 to 9999 Main display decimal place: XXXX, X.XXX, XX.XX, or XXX.X

Main display unit: A, mA, μA, °C, MΩ, kΩ, Ω, kHz, Hz, μF, nF, %, lx, no unit, V, or mV

Example For a current clamp sensor with an input-to-output ratio of 10 mV/A, set the subdisplay to 10.0 mV, and set the main display (value, decimal place, and unit) to 01.00 A.

With these settings, a maximum input of 660.0 mV will be displayed as

66.00 A.

4.6.3 Current Span Setting for the 100 mA Range for DCmA Measurement

When you select the 100 mA range in DCmA measurement mode (

), you can change the

current span (0 to 100 mA, 10 to 50 mA, or 0 to 50 mA).

Input Current Value

(Main display)

0 to 100 mA 10 to 50 mA 0 to 50 mA

Subdisplay for the 100 mA Range

-110.00 mA -110.0% -300.0% -220.0%

0.00 mA 0.0% -25.0% 0.0%

10.00 mA 10.0% 0.0% 20.0%

50.00 mA 50.0% 100.0% 100.0%

100.00 mA 100.0% 225.0% 200.0%

110.00 mA 110.0% 250.0% 220.0%

1) Press the LIGHT or SHIFT key to display “SPAn.”

(The selected current span appears in the subdisplay. The default span is 0 to 100 mA.)

2) Use ▲ (RANGE) and ▼ (REL) to select 0 to 100 mA, 10 to 50 mA, or 0 to 50 mA.

3) Press the HOLD key to save the setting. (After “SEt” appears, “SPAn” will appear

again.)

4) To return to normal measurement from setup mode, hold down the LIGHT key for 1 second or longer.

4.6.4 Setting the Slow Step Time

HOLD

If you select slow step mode for current sweep output, you can select the hold time (in seconds) of each step.

1) Press the LIGHT or SHIFT key to display “t.Int.”

2) Use ▲ (RANGE) and ▼ (REL) to select 15s, 30s, 45s, or 60s.

3) Press the HOLD key to save the setting. (After “SEt” appears, “t.lnt” will appear again.)

4) To return to normal measurement from setup mode, hold down the LIGHT key for 1 second or longer.

4.6.5 Returning the Settings to Their Factory Default Values

You can reset all the items that you have changed (set) in setup mode to their factory default values.

Press the LIGHT or SHIFT key to display the screen for initialization, which shows

“dEF.”

2) The settings return to their default values when you press the HOLD key. (After “donE” appears, “dEF” will appear again.)

3) To return to normal measurement from setup mode, hold down the LIGHT key for 1 second or longer.

Initial Settings (Default Values) for the Setting Items

Setting Item Initial Setting Buzzer sound ON SENSOR

mode Subdisplay 1

0.0 Main display 01.00 Unit A

current span of the 100 mA range for

The

0 to 100 mA DCmA measurement Slow step time setting 15 s

4.7 Additional Power-on Functions

Hold one of the keys below, and turn the function switch from OFF to any position to

congure various functions. (If the CA450 is in sleep mode, hold down one of the keys below and the LIGHT key for 2 seconds or longer to congure various functions.)

Key Congured Function Details

RANGE Current

SELECT All

HOLD The

HOLD + RELΔ/% The SELECT + RANGE Calibration

4.7.1 Making All the LCD Elements Appear

If you hold down the SELECT key and turn the function switch from OFF to any position, all the LCD segments and marks are displayed. The LCD segments and marks are only displayed while the SELECT key is held. (If the CA450 is in sleep mode, hold down the SELECT and LIGHT keys for 2 seconds or longer to turn the entire LCD on.)

output and measurement (30 mA range) span

(0 to 20 mA, 4 to 20 mA)

the LCD elements appear (only while the SELECT

key is pressed).

auto power-off function is disabled. Section 4.5 calibration data is returned to its factory default. —

function Chapter 5

Section

4.4.4 Section

4.7.1

5. User Calibration Function

CAUTION

Subdisplay Calibration point

Main display Measured value

Calibration mode

To make sure that the CA450 is highly accurate, we recommend that you calibrate it regularly. You can use the user calibration function to perform calibration.

To avoid electrical shock:

• Make sure that specialized technicians calibrate the instrument using the proper equipment.

To connect the CA450 to a signal generator (reference device), use the test leads and

• lead cables that come with the reference device.

• Be sure to read the reference device’s instruction manual before you calibrate the CA450.

• When you switch measurement modes during calibration, be sure to remove the test

leads and lead cables rst, and then change the mode and terminal locations.

Calibration

Reference device: Use a reference device that fully satises the accuracy of the CA450.

DC voltage and current generator or digital multimeter (DMM)

Environment: Temperature: 23 ± 5°C, Humidity: 45 to 75% RH (no condensation)

Before you perform calibration, leave the CA450 in the environment

5.1 Calibrating Measurements

Conditions

described above for 30 minutes or more.

Perform calibration according to table 1.

1) While holding down the SELECT and RANGE keys, turn the function switch from the OFF position to the ACV position. The CA450 will start in “calibration mode.” (The “CAL” segment will be visible.) If the CA450 is in sleep mode, hold down the SELECT, RANGE, and LIGHT keys for 2 seconds or longer to start the CA450 in calibration mode.

2) Use the test leads to connect the CA450 to the reference device.

3) From the reference device, apply the values in Table 1.

The calibration point appears in the subdisplay.

4) Press the Hz key to conrm the value.

Note

Press the calibration conrmation key after the reference device’s value stabilizes.

5) To calibrate other ranges, press the RANGE key to switch the range, check the function switch and the input terminals, refer to table 1, and perform steps 3 and 4 again.

To perform peak hold and loop power calibration, see section 5.1.1, “Peak Hold

Calibration,” and section 5.1.2, “LOOP POWER calibration.”

To end calibration, turn the function switch off.

You cannot calibrate the continuity check. Even in calibration mode, normal measurement is performed. (Keys other than RANGE and SELECT cannot be used.)

Table 1 Calibration Table (Measurements)

Function Range Calibration Point (Input value)

AC voltage measurement

DC voltage measurement

6.000 V 6.000 V 50.00/60.00 Hz

60.00 V 60.00 V 50.00/60.00 Hz

600.0 V 600.0 V 50.00/60.00 Hz 1000 V 1000 V 50.00/60.00 Hz*1

6.000 V 6.000 V

60.00 V 60.00 V

600.0 V 600.0 V 1000 V 1000 V 600 mV 600.0 mV

AC voltage measurement

Diode test

Resistance measurement

voltage measurement

*1 If the power supply frequency is 50 Hz, calibrate using 60.00 Hz. If the power supply

frequency

is 60 Hz, calibrate using 50.00 Hz.

600 mV 600.0 mV

2 V 2.000 V

600.0 Ω 600.0 Ω

6.000 kΩ 6.000 kΩ

60.00 kΩ 60.00 kΩ

600.0 kΩ 600.0 kΩ

6.000 MΩ 6.000 MΩ

60.00 MΩ 40.00 MΩ

30.000 mADC 30.000 mA

100.00 mADC 100.00 mA

5.1.1 Peak Hold Calibration

1) In calibration mode (when the “CAL” segment is displayed), turn the function switch to

V position.

the

2) Press the HOLD key to enable peak hold mode.

3) Use the test leads to connect the CA450 to the reference device.

4) From the reference device, apply the value under ZERO in Table 2.

The calibration point appears in the subdisplay. You can clear the peak value by pressing the MIN/MAX key.

5) Press the Hz key to conrm the value.

6) From the reference device, apply the value under Full Scale in Table 2.

The calibration point appears in the subdisplay. You can clear the peak value by pressing the MIN/MAX key.

7) Press the Hz key to conrm the value.

8) To end calibration, turn the function switch off.

Table 2 Calibration Table (Peak Hold)

Function Range

DCV peak

hold

5.1.2

Loop Power Calibration

1) In calibration mode (when the “CAL” segment is displayed), turn the function switch to

the LOOP POWER position.

Connect the CA450 to the reference device as shown in the diagram.

3) Set the reference device (the sink) to -30.000 mA.

The calibration point appears in the subdisplay.

4) Adjust the reference device, which was set to -30.000 mA in the previous step, so that the DMM display value (measured value) is 3.0000 V.

5) Press the Hz key to conrm the value.

6) To end calibration, turn the function switch off.

6.000 V 0 V 6.000 V

Calibration Point (Input value)

ZERO +Full Scale

Condition

—

Table 3 Calibration Table (Loop Power)

Function Range Calibration Point DMM Display (Measured)

Value

LOOP POWER 3

0.000 mADC 30.000 mA 3.0000 V

Connection Diagram (Loop power)

LOOP POWER

Black

Red

Digital multimeter

(DMM)

H (V)

DC voltage and current generator (Sink function)

Load

510 Ω/1 W

100 Ω

3.0000 V

-30.000 mA

Subdisplay Calibration point

Main display Measured value

Calibration mode

Subdisplay Fourth decimal place

Main display Up to the third decimal place

Fourth decimal placeSecond decimal place

5.2 Calibrating Output

Perform calibration according to Table 4.

1) While holding down the SELECT and RANGE keys, turn the function switch from the OFF position to the

2) Connect the CA450 to the reference device as shown in the diagram.

3) Start +5% calibration:

In the main display and the subdisplay, 0.0000 mA appears. (The display in the

subdisplay shows the value up to the fourth decimal place.)

position. (The “CAL” segment will be visible.)

4) Use %STEP▲, %STEP▼, COARSE▲, and COARSE▼ to adjust the value that

Note

appears in the main display and the subdisplay so that it is the same as the value read by the multimeter connected to the CA450.

You can use %STEP▲ and %STEP▼ to adjust the second decimal place (values above

the second decimal place are also affected), and you can use COARSE▲ and COARSE

▼ to adjust the fourth decimal place (the third decimal place is also affected).

After you have nished adjusting the value, press the Hz key to conrm it.

6) Start full scale calibration:

In the main display and the subdisplay, 20.0000 mA appears. (The display in the

subdisplay shows the value up to the fourth decimal place.)

7) Use %STEP▲, %STEP▼, COARSE▲, and COARSE▼ to adjust the value that

appears in the main display and the subdisplay so that it is the same as the value read by the multimeter connected to the CA450.

You can use %STEP▲ and %STEP▼ to adjust the second decimal place, and you can

use COARSE▲ and COARSE▼ to adjust the fourth decimal place.

8) After you have nished adjusting the value, press the Hz key to conrm it.

The calibrated range value is computed and saved in the internal memory. (The previous calibration data is overwritten.)

9) To stop calibration, turn the function switch off.

10) Perform steps 2 through 7 for the SOURCE and SIMULATE output modes.

You cannot calibrate current sweep output. Even in calibration mode, normal output is performed.

(Keys other than SHIFT and SELECT cannot be used.)

Table 4 Calibration Table (Output)

Function Output Direction

Constant current output

SOURCE 1 SIMULATE 1

* Adjust at 5% of the range.

Calibration Point

±5%

±Full Scale

Condition

.0000 mA 20.0000 mA — .0000 mA 20.0000 mA 28 V external

voltage

Connection Diagram (SOURCE, SIMULATE)

SIMULATE

(SINK)

Black

Red

Digital multimeter

(DMM)

SOURCE

Red Black

I (A)

Digital multimeter

(DMM)

I (A)

DC voltage and current generator

5.3 What to Check after Calibration

After you have nished calibrating the CA450, make sure (through inspection) that the

calibration has been performed correctly and that the calibration values have been saved to the memory.

Inspection Method

After calibration has nished, turn off the CA450.

turn on the CA450, and check the calibration in the normal output and measurement

Then, modes (not calibration mode). Use the reference device that you used for calibration to check the calibration. (Refer to the calibration points.)

6. Communication

Note

You can congure the CA450 and check its settings, measured values, and other information from a PC.

Through the use of a communication adapter, the CA450 can communicate with a PC

through USB.

6.1 Cable Connection and Interface Specications

Cable Connection

Remove the blank cover on the back of the CA450, and connect a USB adapter.

Conguring the RS232C Interface

Baudrate: 9600 bps

Parity: None

bits: 2 bits

Stop Data length: 8 bits Flow control: None Terminator: CrLf only

6.2 Communication Commands

Item

Data

acquisition Measurement

settings

Output

settings

Command

MF MR

SM DI

MH RP MI MC

SF SR SD

UP DW SP

RA SS

Outputs measured values

Queries the measurement function Sets or queries the measurement range Sets or queries the measured-value-display

hold function Sets or queries SENSOR mode Switches or queries diode test mode Sets or queries whether the internal resistor for

HART communication is on or off Sets or queries frequency measurement

Sets or queries the RELΔ/% display Sets or queries the MIN/MAX/AVG function Switches or queries the MIN/MAX/AVG function

Sets or queries whether the measurement

mode is DCmV or ACmV (DC sensor or AC

sensor in SENSOR mode) Sets or queries the auto range and range hold

settings Queries the output function Sets or queries the output range (span) Sets or queries the output value Sets or queries whether the current output

function is set to SOURCE or SIMULATE mode Increases the m

Decreases the m Sets or queries SPAN check mode Increases the output value by one step or sets

the output value to 100%

Decreases the output value by one step or sets

the output value to 0%

Sets or queries the current sweep output Sets or queries the slow step time

Description

digit of the output value by 1

Normal

 

 Î  

 

 Î  

 Î

 Î  Î  Î  Î

 

 Î

 Î    Î

 Î

 Î  Î  Î

 Î

 

Cal.

Item

Calibration

Other

commands

Command

CL CP

CMF

CSF

CR CD CW OE OS

ESC C /

ESC S

HC BZ

Description

Sets or queries whether the mode is normal

mode or calibration mode Queries the calibration item Sets the calibration point Queries the measurement mode being

calibrated Confirms the measurement calibration value Queries the output mode being calibrated Sets the output calibration value Confirms the output calibration value Saves the calibration value Outputs error data Outputs setup data Initializes setup data

Outputs the status byte Sets or queries whether a header is attached to

the output data (OD) Sets or queries whether the bits in the status

byte are detected or masked Sets or queries whether the backlight is on or

off Resets the peak hold value Sets or queries whether the buzzer is on or off Sets or queries the span setting for the 100 mA

range for DCmA measurement Sets or queries the input voltage value for

SENSOR mode Sets or queries the converted value for

SENSOR mode Sets or queries the decimal place for SENSOR

mode Sets or queries the unit for SENSOR mode

Normal

 

Î  Î 

Î 

Î  Î  Î  Î  Î     Î

 Î

 

 Î

 Î  Î

 Î

Cal.

6.3 Detailed Command Descriptions

Conguration and Control

Command: The format for sending the command.

Answer: The format of replies to commands, such as conguration and control

commands, that are not queries for information. (Some commands do not receive any reply.) When an error occurs, the same error message that appears on the LCD (“ERRm,” where m is the error number) is returned.

Queries

Command: Return: The format of replies to commands that are queries for information.

Mode Conditions

Normal: Cal.: The command can be used during user calibration (see chapter 5).

The other conditions for each command are listed in section 6.5, “Communication Command Validity Table.”

The format for sending the command.

The command can be used during normal measurement and output.

Sets or queries whether the current output function is set to

SOURCE or SIMULATE mode

Command = ASm<CRLF> -> Answer = ASm<CRLF>

Command = AS?<CRLF> -> Return = ASm<CRLF>

Parameters

m =

0: SOURCE (default)

1: SIMULATE (SINK)

Normal Cal.

 Î

This command returns ERR13 when the CA450 is in constant

current output mode or current sweep output mode.

Sets or queries whether the backlight is on or off Normal Cal.

Command = BLm<CRLF> -> Answer = BLm<CRLF>

Command = BL?<CRLF> -> Return = BLm<CRLF>

Parameters

m =

0: Off (default)

1: On

 Î

Sets or queries whether the buzzer is on or off Normal Cal.

Command = BZm<CRLF> -> Answer = BZm<CRLF>

Command = BZ?<CRLF> -> Return = BZm<CRLF>

Parameters

m =

0: OFF

1: On (default)

 Î

Sets or queries whether the measurement mode is DCmV or

ACmV

Command = CCm<CRLF> -> Answer = CCm<CRLF>

Command = CC?<CRLF> -> Return = CCm<CRLF>

Parameters

0: DCmV measurement (default)

m =

1: ACmV measurement

In SENSOR mode

m = 0: DC sensor measurement (default)

1: AC sensor measurement

If the measurement mode is neither DCmV nor ACmV, ERR13

is returned.

Confirms the output calibration value Normal Cal.

Command = CD<CRLF> -> Answer = CD<CRLF>

In output calibration mode, the current output settings are

used as the output calibration values for the currently selected

function, range, and calibration point (+FS, +5%, -FS, or -5%).

If the CA450 is in a measurement mode, ERR13 is returned.

Queries the calibration item Normal Cal.

Command = CL?<CRLF> -> Return = CLm<CRLF>

Normal Cal.

 

Î 

Parameters

3: Output calibration

m =

4: Measurement calibration

CMF

Queries the measurement mode being calibrated Normal Cal.

Command = CMF?<CRLF> -> Return = CMFm<CRLF>

Parameters

m =

0: DCV

2: Ω

5: Hz

7: ACV

8: DCmV

9: ACmV

10: Diode test

11: Continuity check

12: DCmA

13: LOOP POWER

If the CA450 is in constant current output, current sweep

output, or continuity check function, ERR13 is returned.

Î 

Sets the calibration point Normal Cal.

Command = CPm<CRLF> -> Answer = CPm<CRLF>

Parameters

0: +FS calibration

m =

1: Peak hold zero calibration or +5% output

calibration

2: –FS calibration

3: –5% calibration

–FS calibration and –5% calibration are used to calibrate the

SIMULATE output mode.

If –FS calibration or –5% calibration is specified in

measurement mode, ERR13 is returned.

Î 

Sets the output calibration value Normal Cal.

Command = CRm<CRLF> -> Answer = CRm<CRLF>

Command = CR?<CRLF> -> Return = CRm<CRLF>

Parameters

m =

18.0000 to 22.0000 for ±FS calibration

m = 0.9600 to 1.0400 for ±5% calibration

Î 

CSF

Confirms the measurement calibration value Normal Cal.

Command = CS<CRLF> -> Answer = CS<CRLF>

In measurement calibration mode, the current measured values

are used as the measurement calibration values for the currently

selected function, range, and calibration point (+FS or +0).

If the CA450 is in an output mode, ERR13 is returned.

Queries the output mode being calibrated Normal Cal.

Command = CSF?<CRLF> -> Return = CSFm<CRLF>

Parameters

14: Constant current output

m =

15: Current sweep output

If the CA450 is in a measurement mode, ERR13 is returned.

Saves the calibration value Normal Cal.

Command = CW<CRLF> -> Answer = CW,OK<CRLF>

(normal completion)

Saves the data after a mode or range is calibrated. If you turn

off the CA450 without executing this command, the calibrations

made immediately before are discarded.

Î 

Switches or queries diode test mode Normal Cal.

Command = DIm<CRLF> -> Answer = DIm<CRLF>

 

Command = DI?<CRLF> -> Return = DIm<CRLF>

Parameters

m =

0: Resistance measurement (default)

1: Diode test

If the mode is neither Ω nor diode test, ERR13 is returned.

ESC C/RC

Decreases the output value by one step or sets the output

value to 0%

Command = DQ<CRLF> -> Answer = DQ,OK<CRLF>

Decreases the output value by one step (25%).

Sets the output value to 0% of the span in span check mode.

If the CA450 is in any mode other than constant current output

mode, ERR13 is returned.

Decreases the m

digit of the output value by 1 Normal Cal.

Command = DWm<CRLF> -> Answer = DW,OK<CRLF>

Parameters

m = 1 to 5 (1 is the least significant digit while 5 is the most

significant digit)

If the CA450 is in any function other than constant current

output function, ERR13 is returned.

If the CA450 is in span check mode, ERR13 is returned.

Initializes setup data

"ESC" = ASCII 0x1B

(

)

Command = ESC C<CRLF>

Command = RC<CRLF>

Normal Cal.

 Î

Normal Cal.

 Î

However, when this command is used to initialize the settings:

The output current span setting (0 to 20 mA or 4 to 20 mA) is

not initialized.

ESC S

Outputs the status byte

"ESC" = ASCII 0x1B

(

Command = ESC S<CRLF> -> Answer = m<CRLF>

Outputs the status byte (as a decimal number).

See section 6.6, “Status Byte Format.”

)

Normal Cal.

 

Sets or queries whether a header is attached to the output data

(OD)

Command = Hm<CRLF> -> Answer = Hm<CRLF>

Command = H?<CRLF> -> Return = Hm<CRLF>

Parameters

m =

0: Î header (default)

1: Header

The changed setting is valid until the power is turned off.

Resets the peak hold value Normal Cal.

Command = HC<CRLF> -> Answer = HC,OK<CRLF>

When peak hold is not enabled, ERR13 is returned.

Normal Cal.

 

 Î

* During calibration, only the HD3 command, which switches the mode so that

Sets or queries the measured-value-display hold function Normal Cal.

Command = HDm<CRLF> -> Answer = HDm<CRLF>

Command = HD?<CRLF> -> Return = HDm<CRLF>

Parameters

m =

0: Display update enabled (default)

1: Data hold

2: Auto hold

3: Peak hold

• If the CA450 is in an output mode, ERR13 is returned.

• During MIN/MAX measurement, if HD1 is sent, recording and

the updating of the display of the elapsed time are stopped. If

HD0 is sent, recording and the updating of the display of the

elapsed time are resumed.

• If HD1 is sent while peak hold is enabled, ERR13 is returned.

• To clear peak hold, use the HC command.

peak hold calibration can be performed, is valid.

 

Sets or queries whether the bits in the status byte are detected

or masked

Command = IMm<CRLF> -> Answer = IMm<CRLF>

Command = IM?<CRLF> -> Return = IMm<CRLF>

Sets whether each of the bits in the status byte is detected or

masked. (Querying is performed using the ESC S command.

See section 6.6.)

If you specify IM0, all the bits are masked. If you specify IM63,

all the data bits reflect the current status.

Parameter

m = 0 to 63

bit0 (measurement completion) is detected

2: bit1 (output adjustment completion) is detected

4: bit2 (syntax error) is detected

8: bit3 (overrange) is detected

16: bit4 (24 V loop output error) is detected

32: bit5 (output error) is detected

(Bits 6 and 7 of the status byte are fixed bits.)

The default is m = 63 (no masking)

Normal Cal.

 

Sets or queries whether the internal resistor for HART

communication is on or off

Command = IOm<CRLF> -> Answer = IOm<CRLF>

Command = IO?<CRLF> -> Return = IOm<CRLF>

Parameters

0: 250 Ω resistor off (default)

m =

1: 250 Ω resistor on

If the CA450 is in any mode other than loop power

measurement mode, ERR13 is returned.

Normal Cal.

 Î

Switches or queries the MIN/MAX/AVG function Normal Cal.

Command = MCm<CRLF> -> Answer = MCm<CRLF>

Command = MC?<CRLF> -> Return = MCm<CRLF>

Parameters

m =

0: Measured value display (default)

1: MAX value display

2: MIN value display

3: AVG value display

If MIN/MAX/AVG recording is disabled, ERR13 is returned.

 Î

Queries the measurement function Normal Cal.

Command = MF?<CRLF> -> Return = MFm<CRLF>

Parameters

0: DCV

m =

2: Ω

5: Hz

7: ACV

8: DCmV

9: ACmV

10: Diode test

11: Continuity check

12: DCmA

13: LOOP POWER

Switches or queries frequency measurement Normal Cal.

Command = MHm<CRLF> -> Answer = MHm<CRLF>

Command = MH?<CRLF> -> Return = MHm<CRLF>

Parameters

m = 0: ACV measurement (default)

1: Frequency measurement

If the CA450 is in any mode other than ACV mode, ERR13 is

returned.

 Î

Sets or queries the MIN/MAX/AVG function Normal Cal.

Command = MIm<CRLF> -> Answer = MIm<CRLF>

Command = MI?<CRLF> -> Return = MIm<CRLF>

Parameters

m =

0: MIN/MAX/AVG recording is disabled (default)

1: MIN/MAX/AVG recording starts

If the CA450 is in an output mode, ERR13 is returned.

 Î

Sets or queries the span setting for the 100 mA range for

DCmA measurement

Command = MPm<CRLF> -> Answer = MPm<CRLF>

Command = MP?<CRLF> -> Return = MPm<CRLF>

Parameters

0: 0 to 100 mA (default)

m =

1: 10 to 50 mA

2: 0 to 50 mA

If the CA450 is in an output mode, ERR13 is returned.

The changed setting is valid until it is changed again.

Normal Cal.

 Î

Sets or queries the measurement range Normal Cal.

Command = MRm<CRLF> -> Answer = MRm<CRLF>

Command = MR?<CRLF> -> Return = MRm<CRLF>

Parameters

[DCV]

m = 1: 6 V

3: 60 V

4: 600 V

5: 1000 V

[DCA] m = 0: 30 mA

1: 100 mA

[ACV] m = 0: 6 V

1: 60 V

2: 600 V

3: 1000 V

[Ω] m = 0: 600 Ω

1: 6 kΩ

2: 60 kΩ

3: 600 kΩ

4: 6 MΩ

5: 60 MΩ

[DCmV] m = 0: 600 mV

[ACmV] m = 0: 600 mV

[Diode test] m = 0: 2 V

[Continuity check] m = 0: 600 Ω

[LOOP POWER] m = 0: 30 mA

 

Outputs measured values Normal Cal.

Command = OD<CRLF> -> Return = abbcsddddddeee<CRLF>

Parameters

Header (4 bytes)*

a = V: voltage, A: current, O: resistance, T: temperature,

F: frequency, S: SENSOR mode

bb = DC: direct current, AC: alternating current,

R3: resistance measurement

c = N: normal, O: overrange, E: no data, B: burnout

* The header will not appear if you specify 0 (no header) in

the H command.

Data Area (10 bytes)

s (sign) = _: plus or –: minus (_ represents a space)

dddddd = measured value (6 digits)

eee = E+0, E+3, E–3, E+6, E–6

(For overrange, no data, and burnout, ddddddeee =

_99999.E+6)

 

Outputs error data Normal Cal.

Command = OE<CRLF> -> Return = ERRm<CRLF>

Outputs the most recent output error.

After a value is returned, the saved error number is overwritten

with ‘ERR00<CRLF>’.

Even if there is no error, ‘ERR00<CRLF>’ is returned.

Parameters

m = Error code

See section 6.4, “List of Errors.”

 

Outputs setup data Normal Cal.

Command = OS<CRLF> -> Return = Measure a<CRLF>

Function b<CRLF>

Range c<CRLF>

Source d<CRLF>

Function e<CRLF>

Range f<CRLF>

Data g<CRLF>

24V Output h<CRLF>

Light i<CRLF>

Charge j<CRLF>

Parameters

a (measurement) = ON or OFF

b (measurement function) =

c (measurement range) = 1000V, 600V, 60V, 6V for

600 mV for DCmV

600 mV for ACmV

60 MOHM, 6MOHM, 600kOHM,

60kOHM, 6kOHM, 600OHM for OHM

2 V for diode test

600OHM for continuity check

100 mA or 30 mA for DCmA

30 mA for loop power

d (output) = ON or OFF

e (output function) = DCmA

f (output range) = 20 mA for DCmA

g (output value)

h (output for 24 V loop measurement) = ON or OFF

i (backlight) = ON or OFF

j (charging) = OFF (always OFF)

DCV, OHM, FREQ, ACV, DCmV,

ACmV,

DIODE, CONTINUITY,

DCmA, LOOP POWER

DCV/FREQ

 Î

Sets or queries the current sweep output Normal Cal.

Command = RAm<CRLF> -> Answer = RAm<CRLF>

Command = RA?<CRLF> -> Return = RAm<CRLF>

Parameters

m =

0: Slow Linear (default)

1: Fast Linear

2: Slow Step

3: Fast Step

When the CA450 is in a measurement mode or constant

current output mode, ERR13 is returned.

 

Sets or queries the auto range and range hold settings Normal Cal.

Command = RGm<CRLF> -> Answer = RGm<CRLF>

Command = RG?<CRLF> -> Return = RGm<CRLF>

Parameters

0: Auto range (default)

m =

1: Range hold

When the CA450 is in an output mode or DCmV, ACmV, diode

test, or continuity check mode, ERR13 is returned.

Sets or queries the RELΔ/% display Normal Cal.

Command = RPm<CRLF> -> Answer = RPm<CRLF>

Command = RP?<CRLF> -> Return = RPm<CRLF>

Parameters

m = 0: Normal measurement (default)

1: RELΔ display

2: REL% display

If the CA450 is in an output mode, ERR13 is returned.

 Î

Sets or queries the output value. Normal Cal.

Command = SDm<CRLF> -> Answer = SDm<CRLF>

Command = SD?<CRLF> -> Return = SDm<CRLF>

Parameters

m (output value) = 0.000 to 25.000

If the CA450 is in a measurement mode, ERR13 is returned.

 Î

Queries the output function Normal Cal.

Command = SF?<CRLF> -> Return = SFm<CRLF>

Parameters

m =

14: Constant current output

15: Current sweep output

If the CA450 is in a measurement mode, ERR13 is returned.

Sets or queries the input voltage value for SENSOR mode Normal Cal.

Command = SIm<CRLF> -> Answer = SIm<CRLF>

Command = SI?<CRLF> -> Return = SIm<CRLF>

Parameters

m (input voltage value) = 0000 to 9999 (4 digits)

If the CA450 is in an output mode, ERR13 is returned.

Because the decimal place of the input voltage value is fixed,

only the number is entered.

Sets or queries the decimal place for SENSOR mode Normal Cal.

Command = SLm<CRLF> -> Answer = SLm<CRLF>

Command = SL?<CRLF> -> Return = SLm<CRLF>

Parameters

m (decimal place) = 0: X.XXX, 1: XX.XX, 2: XXX.X, 3: XXXX

 Î

If the CA450 is in an output mode, ERR13 is returned.

Sets or queries SENSOR mode Normal Cal.

Command = SMm<CRLF> -> Answer = SMm<CRLF>

Command = SM?<CRLF> -> Return = SMm<CRLF>

Parameters

m =

0: SENSOR mode is disabled (default)

1: SENSOR mode is enabled

If the CA450 is in a mode other than DCmV or DCmA mode,

ERR13 is returned.

 Î

Sets or queries SPAN check mode Normal Cal.

Command = SPm<CRLF> -> Answer = SPm<CRLF>

Command = SP?<CRLF> -> Return = SPm<CRLF>

Parameters

0: SPAN check mode is disabled (default)

m =

1: SPAN check mode is enabled

When you switch to span check mode, the previously

output values are retained. Change the output values using

commands such as the UQ and DQ commands.

If the CA450 is in any mode other than constant current output

mode, ERR13 is returned.

Sets or queries the output range (span) Normal Cal.

Command = SRm<CRLF> -> Answer = SRm<CRLF>

Command = SR?<CRLF> -> Return = SRm<CRLF>

Parameters

m = 0: 4 to 20 mA span (factory default setting)

1: 0 to 20 mA span

The changed setting is valid until it is changed again.

 Î

 

Sets or queries the slow step time Normal Cal.

Command = SSm<CRLF> -> Answer = SSm<CRLF>

Command = SS?<CRLF> -> Return = SSm<CRLF>

Parameters

m = 0: 15 seconds (default)

1: 30 seconds

2: 45 seconds

3: 60 seconds

If you select slow step mode for current sweep output, this

command sets or queries the hold time of each step.

If the CA450 is in an output mode, ERR13 is returned.

 Î

Sets or queries the converted value for SENSOR mode Normal Cal.

Command = STm<CRLF> -> Answer = STm<CRLF>

Command = ST?<CRLF> -> Return = STm<CRLF>

Parameters

m (converted value) = 0000 to 9999 (4 digits)

If the CA450 is in an output mode, ERR13 is returned.

Sets or queries the unit for SENSOR mode Normal Cal.

Command = SUm<CRLF> -> Answer = SUm<CRLF>

Command = SU?<CRLF> -> Return = SUm<CRLF>

Parameters

m (unit) = 0: A, 1: mA, 2: uA, 3: °C, 5: MΩ, 6: kΩ,

7: Ω, 8: kHz, 9: Hz, 10: uF, 11: nF, 12: %

13: lx, 14: none, 15: V, 16: mV

If the CA450 is in an output mode, ERR13 is returned.

 Î

Sets or queries whether the mode is normal mode or calibration

mode

Command = SYm<CRLF> -> Answer = SYm<CRLF>

Command = SY?<CRLF> -> Return = SYm<CRLF>

Parameters

m =

0: Normal mode (default)

1: Calibration mode

Normal Cal.

 

Increases the m

digit of the output value by 1 Normal Cal.

Command = UPm<CRLF> -> Answer = UP,OK<CRLF>

Parameters

m = 1 to 5 (1 is the least significant digit while 5 is the most

significant digit)

If the CA450 is in any mode other than constant current output

mode, ERR13 is returned.

If the CA450 is in span check mode, ERR13 is returned.

Increases the output value by one step or sets the output value

to 100%

Command = UQ<CRLF> -> Answer = UQ,OK<CRLF>

Increases the output value by one step (25%).

Sets the output value to 100% of the span in span check mode.

If the CA450 is in any mode other than constant current output

mode, ERR13 is returned.

 Î

Normal Cal.

 Î

6.4 List of Errors

When ERR13 appears

in the main display

Number Description ERR00 No errors ERR11 An undened command has been received. ERR12 The parameter specication for the command is incorrect. ERR13 A command has been received that cannot be executed because of the

status of the CA450. ERR16 An error was detected during calibration. ERR20 Error in the power supply for LOOP POWER measurement ERR23 The output current or voltage has exceeded its limit. ERR60 The saved setting data in the internal ash memory is not correct. ERR61 The saved measurement calibration value data in the internal ash

memory is not correct. ERR62 The saved output calibration value data in the internal ash memory is

not correct.

If error number 11, 12, or 13 occurs during communication, the error number appears

in the LCD main display.

6.5 Communication Command Validity Table

Measurement Output

Command

AS BL BZ CC CD CL CMF CP CS CSF CR CW DQ DI DW ESC C/RS ESC S H HC HD IM IO MC MF MH MI MP MR

Normal

RELΔ/% MIN/MAX

Î Î Î Î Î  Î      Î   Î  Î    Î Î  Î  Î   Î  Î Î Î Î Î Î Î Î Î Î Î  Î Î Î Î Î  Î Î  Î Î Î Î Î  Î Î Î Î Î Î Î Î  Î Î  Î Î Î Î Î  Î Î Î Î Î Î Î Î Î Î Î  Î Î Î Î Î Î Î Î  Î Î Î Î Î  Î Î  Î Î Î Î Î Î Î  Î Î Î   Î  Î Î Î Î Î Î Î Î Î Î  Î Î Î    Î Î  Î  Î                     Î Î Î Î Î Î Î     Î Î Î Î Î           Î Î  Î Î Î Î Î Î Î  Î Î Î Î Î Î    Î Î Î Î Î Î   Î Î Î Î Î Î Î  Î  Î Î Î Î Î Î    Î Î Î Î Î Î  Î Î  Î Î Î Î Î

Cal. SETUP

Constant

Current Output Normal Cal. Normal Cal.

Current Sweep

Output

Measurement Output

Command

OD OE OS RA RG RP SD SF SI SL SM SP SR SS ST SU SY UP UQ

Normal

There are communication commands that may not be executable depending on the

selected mode and the status of the CA450.

RELΔ/%

MIN/MAX

     Î Î Î Î             Î   Î  Î Î Î Î Î Î Î Î    Î Î Î Î Î Î Î Î   Î Î Î Î Î Î Î Î Î Î Î Î  Î Î Î Î Î Î Î Î  Î  Î    Î Î Î Î Î Î    Î Î Î Î Î Î  Î Î Î Î Î Î Î Î Î Î Î Î Î  Î Î Î     Î        Î Î Î Î Î Î    Î Î Î Î Î Î    Î Î Î Î Î Î  Î Î  Î     Î Î Î Î Î  Î Î Î Î Î Î Î Î  Î Î Î

Cal. SETUP

Constant

Current Output Normal Cal. Normal Cal.

Current Sweep

Output

6.6 Status Byte Format

Status byte format (see the explanation of the ESC S command)

bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0

LOOP

(xed)1(xed)

bit7: Fixed at 0 bit6: Fixed at 1 bit5: Becomes 1 if an error occurs during output The data is held until the status byte is read.

bit4: Becomes 1 if an error occurs in the power supply for LOOP POWER measurement

The data is held until the status byte is read. bit3: Becomes 1 if a measured value is outside of its limits (overrange) Becomes 1 if the CA450 switches to a higher range when auto range is enabled The data is held until the status byte is read. bit2: Becomes 1 when a forbidden operation or command is processed, when the CA450

cannot parse a command, or when a parameter is outside of its range. The data is held until the status byte is read. bit1: Becomes 1 when output is on after the output value has changed and the output has

stabilized. The data is held until the status byte is read.

bit0: Becomes 1 when measured data is conrmed during measurement.

The data is held until the status byte is read.

Output

error

POWER

supply

error

Overrange

Syntax

error

Output

adjustment

completion

Measurement

end

7. Replacing the Batteries and Fuses

WARNING

CAUTION

Battery slots

Screw position

Back of the case With the case open

Blank cover (USB adapter attachment position)

7.1 Replacing the Batteries

When the battery voltage falls below the operating voltage, appears on the display. Follow the procedure below to replace the batteries.

• To avoid electrical shock, be sure to disconnect the CA450 from the circuit under measurement.

(Remove the test leads and lead cables as well.)

• Turn the CA450 off.

• Do not measure while the case is open. Doing so may lead to electric shock.

• Do not mix different types of batteries or mix old batteries with new batteries.

• Insert the batteries with their polarities in the directions indicated by the holder.

Replacement Procedure

) Remove the fastening screw on the back of the CA450’s case.

2) Open the case.

3) Replace each of the four batteries with a new battery.

4) Return the case to its original position, and tighten the fastening screw.

7.2 Replacing the Fuses

WARNING

F1: (440 mA/1000 V)

F2: (440 mA/1000 V)

Screw position

Back of the case With the case open

During current range measurement, the fuses may melt (blow out) because of excessive current. If this happens, replace the fuses.

• To avoid electrical shock, be sure to disconnect the CA450 from the circuit under measurement.

(Remove the test leads and lead cables as well.)

• Turn the CA450 off.

• Do not measure while the case is open. Doing so may lead to electric shock.

• To avoid damaging the CA450, be sure to use the specied fuses.

Fuse specications (rating and maker):

(440 mA/1000 V, Littlefuse, FLU .440)

Replacement Procedure

F1 and F2

1) Remove the fastening screw on the back of the CA450’s case.

2) Open the case.

3) Remove the fuses from their holders.

4) Insert the new fuses into the holders. (Check the ratings of the fuses.)

5) Return the case to its original position, and tighten the fastening screw.

8. Calibration and After-Sales Service

For a calibration or after-purchase servicing, contact Omega Engineering.

Calibration

o use the CA450 properly, we recommend that you calibrate it regularly. (Refer to the information about the user calibration function.) Recommended calibration period: 1 year

9. Disposing This Product

9.1 Disposing This Product

Waste Electrical and Electronic Equipment (WEEE), DIRECTIVE 2002/96/EC

(This directive is only valid in the EU.)

This product complies with the WEEE Directive (2002/96/EC) marking requirement. The following marking indicates that you must not discard this electrical/electronic product

domestic household waste.

Product Category

ith reference to the equipment types in the WEEE directive Annex 1,

this product is classied as a “Monitoring and Control Instrumentation” product.

disposing products in the EU, contact Omega Engineering.

When Do not dispose in domestic household waste.

9.2 How to Replace and Dispose the Batteries

New EU Battery Directive, DIRECTIVE 2006/66/EC

(This directive is only valid in the EU.)

This is an explanation about the new EU Battery Directive (DIRECTIVE 2006/66/EC). This directive is valid only in the EU. Batteries are included in this product. When you remove batteries from this product and dispose them, discard them in accordance Take a right action on waste batteries, because the collection system in the EU on waste batteries are regulated.

Battery type: Alkaline dry cell

Notice:

This is marking means they shall be sorted out and collected as ordained in ANNEX

How to remove batteries safely:

For

with domestic law concerning disposal.

II in DIRECTIVE 2006/66/EC.

further details, see “7.1 Replacing the Batteries”.

10. Troubleshooting

What to Check When There Is a Problem

If the CA450 does not work properly even after you check the items below or you have a problem that is not listed below, contact Omega Engineering.

Symptom Items to Check

Even when the power is on,

nothing appears on the LCD. Current output is not working. • Have the fuses melted (blow out)?

The output or measured values

are strange.

Control through the USB interface

is not working.

“Err60” appears when the power

is turned on.

“Err61” or “Err62” appears when

the power is turned on.

• Are the batteries inserted properly?

• Have the batteries worn out?

SOURCE mode:

•

When the current is output, is the load

resistance too high?

(Open output terminals or leads)

SIMULATE mode:

• Is the input voltage too low?

(Check the external DCV power supply.)

•

Is it possible that the values are being affected by

noise?

• Are the communication settings correct?

• The settings that were specified with the setup

function are incorrect.

Refer to section 4.6, “Setup Function,” to return

the CA450 to its factory default settings.

• The calibration data is incorrect.

Refer to section 4.7, “Additional Power-on

Functions,” to return the calibration data to its

factory defaults.

If after you perform the above operations, errors

still appear every time you turn on the power,

repairs are necessary.

Appendix 1 Fahrenheit

The default temperature read-out of the Process Multimeter is in Celsius (°C).

To change it to Fahrenheit (°F), it is necessary to proceed as follows:

Changing the temperature unit setting to Fahrenheit

Omega CA450 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Regarding Safe Use of This Product

Contents

1. Overview

2. Operating Environment

3.2 Accuracy

4. Operation

4.1 Precautions before Measurement

4.2 Components

4.3 Measuring Instructions

4.3.8 Loop Power Measurement

4.3.10 Auto Hold Function

4.3.11 Peak Hold Function

4.3.13 MIN/MAX/AVG Function

4.4 Output Instructions

4.4.1 Constant Current Output (SOURCE mode)

4.4.2 Constant Current Output (SIMULATE mode)

4.4.3 Current Sweep Output

4.4.4 Current Span Setting

4.5 Auto Power-Off (Sleep) Function

4.6 Setup Function

4.6.1 Turning the Buzzer On and Off

4.6.2 SENSOR Mode Input, Display, and Unit Settings

4.6.3 Current Span Setting for the 100 mA Range for DCmA Measurement

4.6.4 Setting the Slow Step Time

4.6.5 Returning the Settings to Their Factory Default Values

4.7 Additional Power-on Functions

4.7.1 Making All the LCD Elements Appear

5. User Calibration Function

5.1 Calibrating Measurements

5.1.1 Peak Hold Calibration

Loop Power Calibration

5.2 Calibrating Output

5.3 What to Check after Calibration

6. Communication

6.2 Communication Commands

6.3 Detailed Command Descriptions

6.4 List of Errors

6.5 Communication Command Validity Table

6.6 Status Byte Format

7. Replacing the Batteries and Fuses

7.1 Replacing the Batteries

7.2 Replacing the Fuses

8. Calibration and After-Sales Service

9. Disposing This Product

9.1 Disposing This Product

9.2 How to Replace and Dispose the Batteries

10. Troubleshooting

Appendix 1 Fahrenheit