Toshiba CD731a Schematics

CD731a

DIGITAL MULTIMETER

取扱説明書

INSTRUCTION MANUAL

CONTENTS

SAFETY PRECAUTIONS:Before use, read the following safety precautions

【1】

1-1 Explanation of Warning Symbols …………………………027

1-2 Warning Instruction for safe use …………………………027 1-3 Maximum Overload Protection Input ……………………028

【2】APPLICATION AND FEATURES

2-1 Application……………………………………………………029 2-2 Features………………………………………………………029

【3】NAME OF COMPONENT UNITS

3-1 Display ………………………………………………………029 3-2 Multimeter, Test leads ……………………………………030

【4】Description of Functions

4-1 Switch and description ……………………………………031 4-2 How to Use the Stand………………………………………032

【5】MEASUREMENT PROCEDURE

5-1 Start-up Inspection …………………………………………033 5-2 Voltage Measurement………………………………………034 5-3 Resistance Measurement (Ω) ……………………………035 5-4 Testing Diode ( ) …………………………………………035 5-5 Checking Continuity ( ) ……………………………………036 5-6 Capacity Measurement ( ) ………………………………037 5-7 Current Measurement (μA・mA・A) ……………………038

5-7-1 Current Measurement (μA・mA) ……………………038 5-7-2 Current Measurement (A) ……………………………039

5-8 How to use optional products ……………………………040

5-8-1 AC Clamp Probe (CL-20D) ……………………………040 5-8-2 DC･AC Clamp Probe (CL-22AD)………………………040 5-8-3 DC Clamp Probe (CL33DC) ……………………………041 5-8-4 HV Probe (HV-60) ………………………………………041

【6】MAINTENANCE

6-1 Maintenance and inspection ………………………………042 6-2 Calibration ……………………………………………………042 6-3 How to Replace Battery and Fuse ………………………043 6-4 Cleaning and Storage ………………………………………044

【7】SPECIFICATIONS

7-1 Measurement Range and Accuracy ………………………045 7-2 General Specifications………………………………………046 7-3 Optional accessories General Specifications ……………047

【8】After-Sales Service

8-1 Warranty and Provision ……………………………………047 8-2 Repair…………………………………………………………048 8-3 SANWA web site ……………………………………………048

【1】

SAFETY PRECAUTIONS : Before use, read the following safety precautions

This instruction manual explains how to use your multimeter CD731a safely. Before use, please read this manual thoroughly. After reading it, keep it together with the product for reference to it when necessary.

The instruction given under the heading " WARNING" " CAUTION"

must be followed to prevent accidental burn or electrical shock.

1-1 Explanation of Warning Symbols

The meaning of the symbols used in this manual and attached to

the product is as follows.

: Very important instruction for safe use.

・The warning messages are intended to prevent accidents to

operating personnel such as burn and electrical shock.

・The caution messages are intended to prevent damage to

the instrument.

: Dangerous voltage (Take care not to get an electric shock in

voltage measurement.)

: DC 〜 :AC Ω :Resistance : Buzzer 〜 : Diode 〜:Ground

: Plus :Minus 〜 : Fuse

＋

: Double insulation

1-2 Warning Instruction for safe use

To ensure that the meter is used safely, Be sure to observe

the instruction when using the instrument.

01. Never use meter on the electric circuit that exceed 6k VA.

02. Pay special attention when measuring the voltage of AC 33

Vrms (46.7 Vpeak) or DC 70V or more to avoid injury.

03. Never apply an input signals exceeding the maximum rating

input value.

04. Never use meter for measuring the line connected with

equipment (i.e. motors) that generates induced or surge voltage since it may exceed the maximum allowable voltage.

−

WARNING

−27−

05.

Never use meter if the meter or test leads are damaged or broken.

06. Never use uncased meter.

07.

Be sure to use a fuse of the specified rating or type. Never use a substitute of the fuse or never make a short circuit of the fuse.

08. Always keep your fingers behind the finger guards on the

probe when making measurements.

09. Be sure to disconnect the test pins from the circuit when

changing the function or range.

10. Never use meter with wet hands or in a damp environment.

11. Never open tester case except when replacing batteries or

fuse. Do not attempt any alteration of original specifications.

12. To ensure safety and maintain accuracy, calibrate and check

the tester at least once a year.

13. Indoor use.

1. Correct measurement may not be performed when using the

CAUTION

meter in the ferromagnetic / intense electric field such as places near a transformer, a high-current circuit, and a radio.

2. The meter may malfunction or correct measurement may not

be performed when measuring special waveform such as that of the inverter circuit.

1-3 Maximum Overload Protection Input

Function Input

DCV ACV

Ω／／

●

DC／AC

400・4000μA

DC／AC

40・400mA

DC／AC

4・20A

V, Ω, ●

μA, mA

（＋）

COM（−）

4・20A

COM

(−)

：：：

, ●

：

Maximum rating

input value

DC1000V AC750V

Voltage and current

●

input prohibited

DC,AC

4000μA

DC, AC

400mA

DC, AC

20A

−28−

Maximum overload

protection value

DC1000V,AC750V or peak max. 1000V

DC500V,AC500V or peak max.700V

500mA/250V Fuse

protection

20A/250V Fuse

protection

【2】APPLICATION AND FEATURES

2-1 Application

This instrument is portable multimeter designated for measurement

of weak current circuit.

2-2 Features

・4000 counts disply. ・Auto power save 30min. ・With the capacity measurement function. ・The current function is the semi auto ranges. ・Main unit case and the circuit board is made of fire retarding

materials.

・The instrument has been designed in accordance with the safety

standard IEC 61010-1.(See P46 "Safety")

【3】NAME OF COMPONENT UNITS

3-1 Display

Auto mode display

DC mearsurement display

AC measurement display

Minus polarity display for numeral data

Testing diode display

Decimal point

Numeral data display

−29−

Data hold displayChecking countinuity display

Relative display

Battery dischage warning display

Measurement unit display

〔Fig 1〕

3-2 Multimeter, Test leads

Test lead Fix

Range hold switch

Power switch and function switch

COM − input terminal

Test pins

Plug

V, Ω,● , ●, ●,μA,mA ＋ input terminal

Test lead (TL-21)

Holster

Display

Data hold switch

Select switch

Safety cover

4･20A input terminal

Test probe (Red)

Test probe (Black)

finger guards

Stand

〔Fig 2〕

−30−

【4】Description of Functions

4-1 Switch and description ○Power switch and function switch

Turn this switch to turn on and off the power and to select the functions of V, Ω/● /●,● , μA, mA, A.

○Range hold switch

Pressing this switch once sets the manual mode and the range is fixed. ("AUTO" on the display disappears) Once the manual mode is set, the range moves each time this switch is pressed. Checking the unit on the display and the place of the decimal point, select a desired range. To return to the auto mode, keep pressing this switch until "AUTO" on the display appears.

○Data hold switch

When this switch is pressed, the data display at that time continues ("DH" lights on the display). When the measuring input changes, the display will not change. When this switch is pressed again, the hold status is canceled you can return to the measuring status. ("DH" on the display disappears.)

○Select switch

When this switch is pressed (→), the each modes change as follows.

V●／〜

Ω／●／●

●

400・4000μA●／〜 40・400mA●／〜 4・20A●／〜

● →〜→ ● →〜

Ω→● → ● →Ω

(See 5-6 Capacity Measurement)

● →〜→● →〜

WARNING

Do not change over the function switch with a voltage applied

to the measuring terminals.

−31−

○Auto power off, Auto powersave

This device incorporates auto-power-off function that turns off the display in about 30 minutes to save battery draining. There is a little battery draining even if the auto power save function is activated, therefore be sure to return the Power/Function knob to OFF after measurement. Press the data hold switch before the auto-power-save function is activated to use the devise continuously. To deactivate the auto-power-save function, turn the meter ON while pressing the SELECT button.

○Over Limit (O.L) indication

In case of excess input to this device, the indicator displays O.L. If O.L is displayed during the voltage function, stop the input immediately.

4-2 How to Use the Stand

Please use the stand that there is on the side of rear case like a figure.

〔Fig 3〕

−32−

+ 17 hidden pages