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CD731a(2)


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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



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