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CD731a
DIGITAL MULTIMETER
INSTRUCTION MANUAL
CONTENTS
1 SAFETY PRECAUTIONS:Before use, read the following safety precautions
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 () 035
5-4 Testing Diode ( ) 035
5-5 Checking Continuity ( ) 036
5-6 Capacity Measurement ( ) 037
5-7 Current Measurement ( A mA A) 038
5-7-1 Current Measurement ( A 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 Resistance
: Buzzer : Diode Ground
Plus Minus : Fuse
: Double insulation
1-2 Warning Instruction for safe use
WARNING
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.
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.
CAUTION
1. Correct measurement may not be performed when using the
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 Maximum rating Maximum overload
input value protection value
DCV DC1000V DC1000V AC750V
COM
ACV AC750V or peak max. 1000V
( )
Voltage and current DC500V AC500V
input prohibited or peak max.700V
DC AC V, , DC AC
400 4000 A , 4000 A 500mA/250V Fuse
A, mA protection
DC AC DC, AC
40 400mA 400mA
COM DC, AC 20A/250V Fuse
DC AC
4 20A 20A protection
4 20A
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
Checking countinuity display Data hold display Battery dischage
warning display
Testing diode Relative
display display
Auto mode display
DC mearsurement display
AC measurement display Measurement
unit display
Minus polarity display
for numeral data
Decimal point
Numeral data display Fig 1
3-2 Multimeter, Test leads
Holster
Test lead
Fix
Display
Data hold
Range hold switch
switch
Power switch Select
and function switch
Stand
switch
Safety cover
4 20A input
terminal
COM input
terminal V, , ,
input terminal
Test probe (Red)
Test probe (Black)
Test pins
finger guards
Plug
Test lead (TL-21)
Fig 2
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, / / , , A, 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
(See 5-6 Capacity Measurement)
400 4000 A
40 400mA
4 20A
WARNING
Do not change over the function switch with a voltage applied
to the measuring terminals.
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
5 MEASUREMENT PROCEDURE
5-1 Start-up Inspection
WARNING
1. Never use meter if the meter or test leads are damaged or
broken.
2. Make sure that the test leads are not cut or otherwise damaged.
START
Main unit and Damaged
test leads
damaged?
No damage Stop using it and
have it repaired.
Check continuity of
test leads.
Short the red and
Connect the test lead black test pins.
of black plug to the
COM terminal.
Display shows No
Connect the test
lead of red plug to 00.0 1.0?
the terminal.
Yes
Set the function No problem.
switch at / / Start measurement.
and select the
select switch at .
Fig 4
5-2 Voltage Measurement Maximum rating input value 1000VDC or 750VAC
WARNING
1. Never apply an input signals exceeding the maximum rating
input value.
2. Be sure to disconnect the test pins from the circuit when
changing the function.
3. Always keep your fingers behind the finger guards on the probe
when making measurements.
1) Applications
DCV : Measures batteries and DC circuits.
ACV : Measures sine-wave AC voltage as lighting voltages.
2) Measuring ranges
DCV : 400mV 1000V (5 ranges)
ACV : 4V 750V (4 ranges)
3) Measurement procedure (See Fig 5 or 6, page 9)
Connect the black plug of the test lead to the COM input
terminal and the red plug to the input terminal.
Set the function switch at "V / " function.
Select the select switch at " " (DC) or " " (AC).
Apply the black test pin to the negative potential side of the circuit
to measure and the red test pin to the positive potential side.
Read the value on the display.
After measurement, remove the red and black test pins from
the circuit measured.
Turn the function switch to the position of OFF.
In the AC4V range, a figure of about 3~9 counts will stay on even
if no input signal is present. But it is not malfunction.
In the manual mode of the ACV function, the CD731a can be set
to the 400mV range and shows an approximate value. But its
accuracy is not guaranteed.
Since this instrument employs the means value system for its
AC voltage measurement circuit, AC waveform other than sine
wave may cause error.
5-3 Resistance Measurement ()
WARNING
Never apply voltage to the input terminals.
1) Application
Resistance of resistors and circuits are measured.
2) Measuring ranges
400 40M (6 ranges)
3) Measurement procedure (See Fig 7, page 10)
Connect the black plug of the test lead to the COM input
terminal and the red plug to the input terminal.
Set the function switch at "/ / " function.
Select the select switch at "" (M).
Apply the black and red test pin to measured circuit.
Read the value on the display.
After measurement, remove the red and black test pins from the
circuit measured.
Turn the function switch to the position of OFF.
If measurement is likely to be influenced by noise, shield the object
to measure with negative potential (test lead black).
If a test pin is touched by a finger during measurement, measurement
will be influenced by the resistance in the human body to result in
measurement error.
The input terminals release voltage is about 0.4V.
5-4 Testing Diode ( )
WARNING
Never apply voltage to the input terminals.
1) Application
The quality of diodes is tested.
2) Measurement procedure (See Fig 8, page 11)
Connect the black plug of the test lead to the COM input
terminal and the red plug to the input terminal.
Set the function switch at "/ / " function.
Select the select switch at " ".
Apply the black test pin to the cathode of the diode and the red
test pin to the anode.
Make sure that the display shows a diode forward voltage drop.
Replace the red and black test pins, make sure that the display
is the same as that when the test leads are released.
After measurement, release the red and black test pins from the
object measured.
Turn the function switch to the position of OFF.
Judgement
When the items and are normal, the diode is good.
The input terminals release voltage is about 1.1 1.5V.
5-5 Checking Continuity ( )
WARNING
Never apply voltage to the input terminals.
1) Application
Checking the continuity of wiring and selecting wires.
2) Measurement procedure (See Fig 9, page 12)
Connect the black plug of the test lead to the COM input
terminal and the red plug to the input terminal.
Set the function switch at "/ / " function.
Select the select switch at " " .
Apply the red and black test pins to a circuit or conductor to
measure.
The continuity can be judged by whether the buzzer sounds or
not.
After measurement, release the red and black test pins from the
object measured.
Turn the function switch to the position of OFF.
The buzzer sounds when the resistance in a circuit to measure is
less than about 10 120.
Even if the buzzer does not sound, a resistance value up to 10
120 will be displayed.
The input terminals release voltage is about 0.4V.
When a resistance value is in a range of 20 and 40, noise will
be mixed in the buzzer sound. But it is not malfunction.
5-6 Capacity Measurement ( )
WARNING
1. Never apply voltage to the input terminals.
2. Be sure to discharge the capacitor prior to measurement.
1) Application
Measures capacitance of capacity.
2) Measuring ranges
40nF* 100 F (5 ranges) 1000nF 1 F
3) Measurement procedure (See Fig 10, page 13)
Connect the black plug of the test lead to the COM input
terminal and the red test lead to the input terminal.
Set the function switch at " " function.
Press the select switch to make the display show 00.00nF.
(The "REL" mark illuminates in the upper right area of the display.)
Apply the red and black test pins to capacitor.
Read the value on the display.
After measurement, release the red and black test pins from the
object measured.
Turn the function switch to the position of OFF.
The " " function can be set to the auto range, but not to the
manual range.
In 4nF and 40nF ranges, large value is left, especially when
disconnecting measuring terminals. This is not malfuction.
For measurement of 100nF (0.1 F) or below, the display will not
stabilize due to the influence of ambient noise and floating
capacity. It is therefore recommended that an object to measure
(capacitor) be directly connected between the ( ) and ( )
measuring terminals of the CD731a.
As the capacitance increases, the measuring time becomes longer.
Example: 2 to 4 seconds at 10 F 5 to 8 seconds at 50 F
Example: 13 to 16 seconds at 100 F
5-7 Current Measurement ( A, mA, A)
WARNING
1. Never apply voltage to the input terminals.
2. Be sure to make a series connection via load.
(please see to above drawing)
3. Do not apply an input exceeding the maximum rated current
to the input terminals.
Power Power
Load Load
Wrong connection Right connection
Fig 5
5-7-1 Current Measurement ( A, mA)
Maximum rating input value DC/AC 4000 A 400mA
1) Applications
Current in DC and AC circuit is measured.
2) Measuring ranges
DCA:400 4000 A, 40 400mA (4 ranges)
ACA:400 4000 A, 40 400mA (4 ranges)
3) Measurement procedure (See Fig 12, page 15)
Connect the black plug of the test lead to the COM input
terminal and the red plug to the input terminal.
Set the function switch at "400 4000 A" or "40 400mA" function.
Select the select switch at " " (DC) or " " (AC).
Apply the black test pin to the negative potential side of the circuit
to measure and the red test pin to the positive potential side.
Read the value on the display.
After measurement, remove the red and black test pins from
the circuit measured.
Turn the function switch to the position of OFF.
If the display will not change when an input signal is applied
(measurement is not possible), a probable cause is a blown fuse.
Since this instrument employs the means value system for its
AC voltage measurement circuit, AC waveform other than sine
wave may cause error.
5-7-2 Current Measurement (A) Maximum rating input value DC/AC 20A
WARNING
1. Never apply voltage to the input terminals.
2. Finish measurement within 10 seconds to prevent heat
generation.
3. Provide intervals 5 minutes or longer between measurements
to prevent heat generation. (Continuous measurement:max 5A)
4. Perform measurement with the leads kept straight to prevent
overheat.
1) Applications
Current in DC and AC circuit is measured.
2) Measuring ranges
DCA: 4 20A (2 ranges), ACA: 4 20A (2 ranges)
3) Measurement procedure (See Fig 13, page 16)
Slide the safety cover of the CD731a to the left and insert the
red plug of the test leads to the 4 20A measuring terminal and
the black plug to the COM ( ) terminal.
Set the function switch at "4 20A / " function.
Select the select switch at " " (DC) or " " (AC).
Apply the black test pin to the negative potential side of the
circuit to measure and the red test pin to the positive potential
side.
Read the value on the display.
After measurement, remove the red and black test pins from
the circuit measured.
Turn the function switch to the position of OFF.
If the display will not change when an input signal is applied
(measurement is not possible), a probable cause is a blown fuse.
Since this instrument employs the means value system for its
AC voltage measurement circuit, AC waveform other than sine
wave may cause error.
5-8 How to use optional products
WARNING
Never apply an input signals exceeding the maximum rating
input value of optional products.
5-8-1 AC Clamp Probe (CL-20D) Maximum measurement value AC200A
(See Fig 14, page 17)
Connect the black plug of the current probe to the COM input
terminal and the red plug to the input terminal.
Set the function switch at "V / " function.
Select the select switch at " " and set the 4V range with the
range hold switch.
Select either 20A or 200A with selector knob of clamp probe.
Open the clamp part, have electric line (one line) clamped.
Read the value on the display in A unit and when current probe
of the 20A range after multiplying indicated value by 10, and the
200A range after multiplying indicated value by 100.
After measurement, open the clamp part and release clamp probe
from the electric wire.
Turn the function switch to the position of OFF.
5-8-2 DC AC Clamp Probe (CL-22AD) Maximum measurement value DC/AC200A
(See Fig 15, page 18)
Connect the black plug of the current probe to the COM
terminal and the red plug to the terminal.
Set the function switch at "V / " function.
Select the select switch at " " (DC) or " " (AC).
Set the 400mV range (at DC measurement) or 4V range (at AC
measurement) with range hold switch.
Select either 20A or 200A with selector knob of clamp probe.
probe to make the display of the CD731a show "000.0".
Open the clamp part, have electric wire (one line) clamped.
Read the value on the display as follows.
DC20A : multiplying by 0.1 AC20A : multiplying by 100
DC200A : multiplying by 1 AC200A : multiplying by 1000
After measurement, open the clamp part and release clamp probe
from the electric wire.
Turn the function switch of multimeter and selector knob of
clamp probe to the position of OFF.
5-8-3 DC Clamp Probe (CL33DC) Maximum measurement value DC300A
(See Fig 16, page 19)
Connect the black plug of the current probe to the COM input
terminal and the red plug to the input terminal.
Set the function switch at "V / " function.
Select the select switch at " " (DC) and set the 400mV range
with the range hold switch.
Select either 30A or 300A with selector knob of clamp probe.
Open the clamp part, have electric line (one line) clamped.
Read the value on the display in A unit and when current probe
of the 30A range after multiplying indicated value by 0.1, and the
300A range after multiplying indicated value by 1.
After measurement, open the clamp part and release clamp probe
from the electric wire.
Turn the function switch of multimeter and selector knob of
clamp probe to the position of OFF.
5-8-4 HV Probe (HV-60)Maximum measured voltage: DC30kV
(See Fig 17, page 20)
WARNING
1.The probe is designed for the measurement of very small DC
circuit. Never use the probe to measure high voltage in power Iines,
Such as transmission and distribution lines; it is very dangerous.
2.Never apply an input signals exceeding the maximum
rating(30kV)of HV prove.
3.Be sure to disconnect the test pins from the circuit when
changing the function.
4.Always keep your fingers behind the finger guards on the
probe when making measurement.
1) Measurement item
Anode voltage of cathode ray tube, high focusing voltage, and
voltage of high-impedance circuit
2) Measurement range : DC1000V range
(Set manually in the manual mode)
3) Measuring method
Insert the red plug of the high-voltage probe into the V input
terminal and the black plug into the COM terminal.
Set the function switch to V, select DC with the SELECT
switch, and set the RANGE HOLD switch to the 1000 V range.
Connect the black clip to the ground line of the circuit under test and
touch the measuring position with the pin at the end of the probe.
Read the indicator and multiply the reading by 0.1 for kV.
After measurement, release the pin from the circuit under
test and then remove the clip.
HV-60 cannot be used for AC voltage measurement.
6 MAINTENANCE
WARNING
1. This section is very important for safety. Read and understand
the following instruction fully and maintain your instrument
properly.
2. The instrument must be calibrated and inspected at least once
a year to maintain the safety and accuracy.
6-1 Maintenance and inspection
1. Appearance
Is the appearance not damaged by falling?
2. Test leads
Is the cord of the test leads not damaged?
Is the core wire not exposed at any place of the test leads?
If your instrument falls in any of the above items, do not use it and
have it repaired or replace it with a new one.
Make sure that the test leads are not cut, referring to the section.
6-2 Calibration
The calibration and inspection may be conducted by the dealer.
For more information, please contact the dealer.
6-3 How to Replace Battery and Fuse (See Fig 18, page 22)
WARNING
1. If the rear case is removed with input applied to the input
terminals, you may get electrical shock. Before starting the work,
always make ure that no inputs is applied.
2. Be sure to use the fuse is same rating so as to ensure safety
and performance of tester.
3. When operator remove the rear case, do not touch the internal
parts or wire with hand.
Remove the holster.
Remove the rear case screw with a screwdriver.
Remove the rear case.
Take out the battery and replace it with a new one.
Attach the rear case and fix it with the the screw.
Attach the holster.
* Do not use mix new and old batteries together.
Fuse of the Specified Rating and Type
(Fuse with arc-extinguishing agent)
500mA/250V 5 20mm Blowout capacity:1500A
20A/250V 6.3 32mm Blowout capacity:200kA
Remove the holster.
Remove the rear case screw with a screwdriver.
Remove the rear case.
Pull out the fuse out of holder on the circuit board and replace it.
Put back rear case where it was and tighten the screw.
Check and see whether or not indications of respective ranges
are normal.
Attach the holster.
6-4 Cleaning and Storage
CAUTION
1. The panel and the case are not resistant to volatile solvent and
must not be cleaned with thinner or alcohol.
For cleaning, use dry, soft cloth and wipe it lightly.
2. The panel and the case are not resistant to heat. Do not place
the instrument near heat-generating devices (such as a soldering
iron).
3. Do not store the instrument in a place where it may be subjected
to vibration or from where it may fall.
4. For storing the instrument, avoid hot, cold or humid places or
places under direct sunlight or where condensation is anticipated.
Following the above instructions, store the instrument in good
environment.
7 SPECIFICATIONS
7-1 Measurement Range and Accuracy
Accuracy assurance range : 23 5