【1】SAFETY PRECAUTIONS Before use, read the following safety precautions.
This instruction manual explains how to use your new digital multimeter
CD800a safely. Before use, please read this manual thoroughly. After readingit, keep it together with the product for reference to it when necessary.
The instruction given under the heading of “
WARNING” 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 tooperating personnel such as burn and electrical shock.
The caution messages are intended to prevent damage to the
instrument.
：Ground：Diode：Fuse：Buzzer：Capacitance
Ω：Resistance：Direct current(DC)
Hz：Frequency～：Alternating current(AC)％ ：Duty cycle：Double insulation(Protection ClassⅡ)＋ ：Plus input(Red)－：Minus input(Black)

CD800aDIGITAL MULTIMETER
INSTRUCTION MANUAL

10.Be sure to disconnect the test pins from the circuit when changing
the function.
11.Before starting measurement, make sure that the function andrange are properly set in accordance with the measurement.
12.Never use meter with wet hands or in a damp environment.
13.Never open tester case except when replacing batteries or fuse.
Do not attempt any alteration of original specifications.
14.Do not use the device near an item of strong electromagnetic
generation or a charged item.
15.To ensure safety and maintain accuracy, calibrate and check thetester at least once a year.
16.The multimeter is for indoor use only.
1-3 Overload protections
Input
terminals

Function
V

＋

(Red)
Ω/

/

/
－

Hz / %

1-2 Warning Instruction for Safe Use(Black)mA

WARNING

4-1 Function Switch
Turn this switch, to turn on and off the power and to select thefunctions of V
～, Ω/
/
/
, Hz/%, mA～
4-2 SELECT：Measurement Function SelectWhen the SELECT button is pressed (→), the functions change as follows.
・In the case of V, mA, the modes change as： → ～ →・In the case of Ω, , , , the modes change：Ω→→→ →Ω

To ensure the meter is used safely, be sure to observe the instruction
when using the instrument.
1.Never use meter on the electric circuits that Exceed 3 kVA.
2.Never apply an input signal exceeding the maximum rating input value.
3.Never use meter if the meter or test leads are damaged or broken.
4.Pay special attention when measuring the voltage of AC 30 Vrms(42.4
V peak) or DC 60 V or more to avoid injury.
5.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.
6.Never use uncased meter.
7.Be sure to use a fuse of the specified rating or type. Never use asubstitute of the fuse or never make a short circuit of the fuse.
8.When connecting and disconnecting the test leads, first connecting
the ground lead(black one). When disconnecting them, the groundlead must be disconnected last.
9.Always keep your fingers behind the finger guards on the probe when
making measurements.

4-3 RANGE：Range Hold
Press the RANGE button momentary to set the manual range mode,
then ‘AUTO’ disappears in the display. In manual range mode, press the
button again to step through the ranges. To return to the auto mode,press the button for 1 sec. or more, then ‘AUTO’ is shown.
※Manual mode is not available in, Hz, duty measurement, diodecheck, cont. buzzer functions.
4-4 △REL：Relative Mode
Relative zero allows the user to offset the meter consecutive
measurements with the displaying reading as the reference value. Pressthe △REL button momentarily to activate and to exit relative zero mode.
4-5 HOLD：Data Hold
When the HOLD button is pressed, the display is hold (‘DH’ is shownon the display). The display will not be changed while the function is
active. Press the button again to cancel the function.(‘DH’ on thedisplay disappears.)※DATA HOLD function does not work when measuring frequency.
4-6 Hz/%：Frequency and duty cycle select button
Frequency and duty cycle measurement functions are activated alternatively
by pressing the button. In the case of the mode change as Hz → %4-7 Auto Power Off
The meter will enter a low power consumption sleep mode automaticallyto extend battery life after approximately 30 minutes of no function switch
or push button operations. To wake up the meter from Auto Power Off,press any buttons momentarily or turn the function switch to the OFF
position. Then turn back on again. To disable the Auto Power Off feature,press the SELECT button while turning the function switch on.
※Always turn the function switch to the OFF position when the meter
is not in use.
－ 4 －5-5 Checking Continuity ()

WARNING
Never apply voltage to the input terminals.
1) Applications
Checking the continuity of wiring and selecting wires.
2) How to use① Set the FUNTION switch at Ω///.
② Selectby pressing the SELECT button.
③ Apply the red and black test pins to a circuit or conductor to measure.
④ The continuity can be judged by whether the buzzer sounds or not.
⑤ After measurement, release the red and black test pins from the object measured.
● Threshold : 10~120 Ω

5-1 Start-Up Inspection

WARNING
1. Make sure that no low battery indication appear in the display.
2. Never use meter if the meter or test leads are damaged or broken.
3. Check continuity of test leads & fuse.
※ No display may suggest that a battery be exhausted.
START

Check

Main unit
and test leads
damaged?

①

Check continuty of test
leads.
①Set the function at "②

DamagedNo damaged".

②Short the red andblack test pins.
The buzzer sounds?

No

⑤

②

)

Never apply voltage to the input terminals.

CAUTION
1. Discharge the capacitance before measurement.
2. This is not suitable for measurement of electrolytic condenser suchas a large leakage condenser.
3. It takes a while to measure large capacitance.
1) Applications
Measures capacitance of low leakage condenser such as film
condenser.
2) Measuring ranges
5 ranges from 50.00 nF to 100.0μF (Auto range).

②④

CAUTION

1. The panel and the case are not resistant to volatile solvent and mustnot be cleaned with thinner or alcohol.
2. For cleaning, use dry, soft cloth and wipe it lightly.
3. The panel and the case are not resistant to heat. Do not place theinstrument near heat-generating devices (such as a soldering iron).
4. Do not store the instrument, in a place where it may be subjected
to vibration or from where it may fall.
5. For storing the instrument, avoid hot, cold or humid places or places
under direct sunlight or where condensation is anticipated.

【7】AFTER-SALE SERVICE
7-1 Warranty and Provision

Sanwa offers comprehensive warranty services to its end-users and to its
product resellers. Under Sanwa's general warranty policy, each instrument
is warranted to be free from defects in workmanship or material undernormal use for the period of one (1) year from the date of purchase.
This warranty policy is valid within the country of purchase only, and applied
only to the product purchased from Sanwa authorized agent or distributor.
Sanwa reserves the right to inspect all warranty claims to determine theextent to which the warranty policy shall apply. This warranty shall not apply
to fuses, disposables batteries, or any product or parts, which have been
subject to one of the following causes:
1. A failure due to improper handling or use that deviates from the
instruction manual.
2. A failure due to inadequate repair or modification by people other than
Sanwa service personnel.
3. A failure due to causes not attributable to this product such as fire,
flood and other natural disaster.
4. Non-operation due to a discharged battery.
5. A failure or damage due to transportation, relocation or dropping after thepurchase.
7-2 Repair
Customers are asked to provide the following information when requesting services:
1. Customer name, address, and contact information
2. Description of problem
3. Description of product configuration
4. Model Number
5. Product Serial Number
6. Proof of Date-of-Purchase
7. Where you purchased the productPlease contact Sanwa authorized agent / distributor / service provider,listed in our website, in your country with above information. An instrument
sent to Sanwa / agent / distributor without those information will be returnedto the customer.

Note:1) Prior to requesting repair, please check the following:
Capacity of the built-in battery, polarity of installation anddiscontinuity of the test leads.
－ 12 －④

ACV measurement
Outlet
5-3 Resistance Measurement (Ω)

RELATIVE
buttonV

mA～

MAX 400mA
FUSED－＋～ 600V MAX(CAT. Ⅲ)
DIGITAL
MULTIMETER

1) Applications
Measures frequency and duty of any circuit.
2) Measuring ranges
6 ranges from 5 Hz to 100 kHz (Auto range)
Duty Cycle : 20 %~80 %3) Measurement procedure① Set the function switch at Hz / % function.
② Select Hz by pressing Hz/% selection button.
③ Apply the red and black test pins to a conductor to measure.
④ Read the value on the display.
⑤ After measurement, release the red and black test pins from the object measured.
● HOLD function does not work in Frequency measurement function.

⑤

5-8 Current Measurement

Body Cover

Stopper②③④
ΩResistor①

5-4 Testing Diode ()

Power source

Load

Load

（×）

（○）

1) Applications
The quality of diodes is tested.
2) How to use① Set the FUNTION switch at Ω///.
② Selectby pressing the SELECT button.
③ Apply the black test pins to the cathode of the diode and the red test pin to the anode.
④ Make sure that the display shows a diode forward voltage drop.
⑤ Replace the red and black test pins, make sure that the display is “OL” reading.
⑥ After measurement, release the red and black test pins from the object measured.
● The input terminals open voltage is about 1.5 V③
Cathode
Anode
④
②
⑥

【6】MAINTENANCE

mA● DCmA：Maximum rating input value 400 mADC
● ACmA：Maximum rating input value 400 mAAC
1) Applications
DCA：Current in batteries and DC circuits is measured.
ACA：Current in AC circuits is measured.
2) Measuring ranges
DC/ACmA：2 ranges for 400.0 mA and 40.00 mA.
3) Measurement procedure① Set the function switch at “mA” and select either DC or AC with the SELECT button.
② In the circuit to measure and apply the red and black test pins in series with load.
● For measurement of DCA, apply the black test pin to the negative
potential side of the circuit to measure and the red test pin to thepositive potential side in series with load.
● For measurement of ACV, apply the red and black test pins to thecircuit to measure in series with load.
③ Read the value on the display.
④ After measurement, remove the red and black test pins from the circuit measured.
◆ Use Hz/% function for making Hz and duty cycle measurements.

①

Power
source6-1 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?
Note：If the built-in fuse is blown, only the current measurement becomes impossible.
Note：Make sure that the test leads are not cut, referring to the section 5-1.
6-2 Calibration
The manufacturer may conduct the calibration and inspection. For
more information, please contact the dealers.
6-3 Battery and Fuse Replacement

WARNING
1. If the rear case or the battery lid is removed with input applied tothe input terminals, you may get electrical shock. Before starting
the work, always make sure that no input is applied.
2. Before starting the work, be sure to turn OFF the main unit power
and release the test leads from the circuit.
3. Be sure to use a fuse of the specified rating or type. Never use asubstitute of the fuse or never make a short circuit of the fuse.
① Remove the battery lid screw with a screwdriver.
② Take out the battery or fuse and replace it with a new one.
③ Attach the battery lid and fix with the screw.

CAUTIONSet battery with its polarities facing in the correct directions.
Rear case

Load④

R6(UM-3)
Fuse
0.5 A / 250 V
F1176
φ5×20 mm
Blowout capacity: 1.5 kA

④

mA

－ 9 －

7-3 SANWA Website
http://www.sanwa-meter.co.jp
E-mail: exp_sales@sanwa-meter.co.jp－ 10 －

確度保証範囲：温度23±5 ℃ 湿度：80 %R.H.以下 結露のないこと
Accuracy assurance range : 23±5 ℃&less than 80 % R.H. No Condensation

400.0 mV ±(0.7 %rdg＋3dgt)
直流 電圧4.000 VDCV

40.00 VDC Voltage

400.0 V

交流電圧

AC Voltage

8-1 General Specification
Measuring
Display
Sampling RateΔΣmethod
3 3/4 digit, 4000 counts
Approx.3 times/sec

Range Selection

Auto and Manual ranges(Manual range or Auto renge only)

Over ranging lndication“OL” mark indication (except AC/DC 600 V ranges)

Polarity Indication

Automatic selection(“－” is indicated when negative
voltage is inputted.)

Low Battery Indication
Environmental Condition

Below approx. 2.4 V “” mark indication
Operating altitude <2000 m / Pollution degreeⅡ

Operating temperature

5 ℃～40 ℃ humidity range: Maximum 80 % RH for
temperatures up to 31 ℃ decreasing linearly to 50 % RH
at 40 ℃

Storage temperature /humidity range-10 ℃～50 ℃ 70 %R.H. max. No condensation. (remove
batteries)

Power Supply
AC sensoring
Battery Life
Dimension
MassPower consumption
Battery life
Fuse
Accessories

R06×2
Average sensoring
30 min. (auto power save)
L 176 mm×W 104 mm×H 46 mm
Approx. 340 g
Approx. 7 mW TYP. (at DCV)
Approx. 500 hours at DCV±(1.1 %rdg＋3dgt)

4.000 V

400.0 V±(1.6 %rdg＋5dgt)

600 V
400.0 Ω約10 MΩ
Approx. 10 MΩ±(0.5 %rdg＋3dgt)

50.00 kHz

20～80 % ±(0.5 %rdg＋5dgt)

4.000 kΩ
開放電圧：DC約 0.4 V
40.00 kΩ ±(1.2 %rdg＋5dgt) Open voltage : Approx.DC 0.4 V

Ω

400.0 kΩ

測定電流は被測定抵抗の抵抗によって変化します。
4.000 MΩ ±(2.0 %rdg＋3dgt) The measurering current changes according to theresistance of the resistor to measure.
40.00 MΩ ±(4.0 %rdg＋3dgt)※オートレンジのみ。
※Auto range only.
静電容量500.0 nF
表示されている値をリラティブ機能によって5.000 μF ±(5.0 %rdg＋10dgt)
キャンセルした後の確度。
Capacitance 50.00 μF
Accuracy was measured after canceling didplay
value by relative key
100.0 μF.

※オートレンジのみ。
※Auto range only.
5 Hz～60 Hz 3 Vrms～30 Vrms
60 Hz～200 Hz 4.9 Vrms～30 Vrms

DC Current
交流電流40.00 mA

DCmA
※正弦波交流おける確度
確度保証周波数範囲40～400 Hz※Accuracy in the cace of sin wave
40～400 Hz※オートレンジのみ。
※Auto range only.
1 Hz～1 kHz 4 Vrms～250 Vrms
1 kHz～100 kHz 4 Vrms～20 Vrms

約1 Ω
Approx. 1 Ω±(2.2 %rdg＋5dgt) ヒューズ抵抗を除く
Without resistance
400.0 mAof Fase

直流電流±(1.5 %rdg＋5dgt)

50.00 nF

5.000 kHz

Duty Cycle

抵抗

Resistance

500.0 Hz100.0 kHz%

約10 MΩ

±(1.6 %rdg＋9dgt) Approx. 11 MΩ

50.00 Hz

デューティー比≧100 MΩ

Approx. 10 MΩ

40.00 VHz

備 考
Remarks

Approx. 11 MΩ

600 V

ACV

【8】SPECIFICATIONS

入力抵抗
Input Impedance

5.000 Hz
周波数

Frequencyrdg(reading)：読取値、dgt(digit)：最終桁のカウント数
確 度
Accuracy

Battery lid screw－ 11 －

8-2 測定範囲及び確度 / Measurement Range and Accuracy

ファンクション&レンジ
Function&Range

WARNING

1. The section is very important for safety. Read and understand thefollowing 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.

②

2) Repair during the warranty period:
The failed meter will be repaired in accordance with the conditions stipulated in
7-1 Warranty and Provision.
3) Repair after the warranty period has expired:
In some cases, repair and transportation cost may become higher than the price ofthe product. Please contact Sanwa authorized agent / service provider in advance.
The minimum retention period of service functional parts is 6 years after the
discontinuation of manufacture. This retention period is the repair warranty
period. Please note, however, if such functional parts become unavailable forreasons of discontinuation of manufacture, etc., the retention period may
become shorter accordingly.
4) Precautions when sending the product to be repaired
To ensure the safety of the product during transportation, place the product in a box
that is larger than the product 5 times or more in volume and fill cushion materials
fully and then clearly mark “Repair Product Enclosed” on the box surface. The costof sending and returning the product shall be borne by the customer.

⑥

Battery lid③③

WARNING

Never apply voltage to the input terminals.

⑤

WARNING

Power source

⑤

④

Diode
－ 7 －

1. Never apply voltage to the input terminals.
2. Be sure to make a series connection via load.
3. Do not apply an input exceeding the maximum rated current to the
input terminals.
4. Before starting measurement, turn OFF the power switch of thecircuit to separate the measuring part, and then connect the test
leads firmly.

②
Hz ％Removable
test pin covers

POWER switch and FUNCTION switch①④

Never apply an input signal exceeding the maximum rating input value.

Test Probe（Red）
Test Probe（Black）～
Hz %Hz / %
select button

1) Applications
Resistance of resistors and circuits are measured.
2) Measuring ranges
6 ranges from 400Ω to 40 MΩ.

⑥

WARNING

Finger Guards

Hz %

Ω

DATA HOLD
buttonWARNING

Capacitor⑥

ACmA
AC Current

40.00 mA

約1 Ω
※正弦波交流おける確度
Approx. 1 Ω
確度保証周波数範囲 40～400 Hz±(2.8 %rdg＋5dgt) ヒューズ抵抗を除く※Accuracy in the cace of sin
Without resistance
400.0 mA
wave 40～400 Hz
of FaseChecking Continuity

Testing Diode10～120 Ω以下で発音・開放電圧：DC約0.4 V
Buzzer sounds at less than 10～120 Ω・Open voltage:Approx.DC 0.4 V
開放電圧：DC約1.5 V
Open voltage: Approx. DC 1.5 V※トランスや大電流路など強磁界の発生している近く、また無線機など強電界の発生している近くでは正常な測定ができない場合があります。
確度計算方法 / Accuracy calculation
例）直流電圧測定(DCmV) / For example…Measurement 400 mVDC Range.
表示値 / Display value : 100.0[mV]
レンジ確度 / Accuracy : 400.0[mV] レンジ / Range…±(0.3 %rdg+4dgt)
誤差 / Error : ±(100.0[mV]×0.3 %rdg+4dgt)=±0.7[mV]
計算式 / Calculation : 100.0[mV]±(100.0[mV]×0.3 %rdg+4dgt)
真値 / True value : ln a range of 099.3[mV]～100.7[mV]の範囲内。
※400.0[mV]レンジにおける4[dgt]とは、0.4[mV]に相当します。
※4[dgt] in the 400.0[mV]range correspond to 0.4[mV]
ここに掲載した製品の仕様や外観は改良等の理由により、予告なしに変更することが有りますのでご承知ください。
Specifications and external appearance of the product described above may
be revised for modification without prior notice.

0.5 A / 250 V Fast Acting Fuse, Parts number:F1176
Instruction manual－ 13 －OFF－ 6 －3) Measurement procedure① Set the FUNTION switch at Ω///.
② Selectby pressing the SELECT button.
③ Press the REL button for zero setting (00.00 nF).
④ Apply the red and black test pins to a conductor to measure.
⑤ Read the value on the display.
⑥ After measurement, release the red and black test pins from the object measured.
● Manual range is not available in capacitance measurement.
● Readings are unstable because of stray capacitance in test leads or noise.

HOLD

AUTO POWER OFF

Never apply voltage to the input terminals.

－5 －

①

SELECT RANGE △RELSELECT button

DCV measurement

WARNING－ 8 －6-4 Storage

Battery④④

5-2 Voltage measurement④

Test Pins

3) Measurement procedure① Set the FUNTION switch at Ω/ / /and select Ω with the
SELECT button.
② Apply the red and black test pins to an object to measure.
③ The reading is shown in the display.
④ After measurement, release the red and black test pins from the object measured.
Note : If measurement is likely to be influenced by noise, shield theobject to measure with negative potential (COM). If a finger
touches a test pin during measurement, measurement will be
influenced by the resistance in the human body, and that results
in measurement error. Open Circuit Voltage: <0.4 VDC typical.
● When the presence of voltage, resistance measurement can not work.

mA

WARNING

4000 Count

3) Measurement procedure① Set the FUNCTION switch at “V” and select either DC or AC with the
SELECT button.
② Apply the red and black test pins to the circuit to measure.
● For measurement of DCV, apply the black test pin to the negative
potential side of the circuit to measure and the red test pin to thepositive potential side.
● For measurement of ACV, apply the red and black test pins to thecircuit to measure.
③ The reading of Voltage is shown on the display.
④ After measurement, release the red and black test pins from theobject measured.
◇ Readings are unstable when test leads are opened.
◇ Accuracy is guaranteed in the case of sine wave (Bandwidth 40 ~400 Hz)◇ 400 mV AC range is not specified.
◇ In the manual mode of the ACV function, the CD800a can be set to the
400 mV range and shows an approximate value. But its accuracy is notguaranteed.
◇ In the AC 4 V range, a figure of about 3～9 counts will stay on even if
no input signal is present. But it is not malfunction.
◆ Use Hz/% function for making Hz and duty cycle measurements.

①③①

CD800aRANGE
hold button

Test Leads

－ 3 －

V

⑤
②

Display－ 2 －③DCV / ACV : Maximum rating input value 600 V DC/AC
1) Applications
DCV : Voltage of the battery and DC circuit are measured.
ACV : Sine wave AC voltage, such as lighting voltage, is measured.
2) Measuring ranges
DCV : 5 ranges from 400 mV to 600 V
ACV : 4 ranges from 4 V to 600 V

Hand strap

Multimeter

When not covered

2-1 Applications
This instrument is portable digital multimeter designed for measurementof weak current circuits. It plays an important role in circuitry analysis byusing additional functions as well as measurements of small typecommunication equipment, electrical home appliance, lighting voltage andbatteries of various type.

Yes
No problem.
Start measurement.

1. Never apply an input signal 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.

【3】NEME OF COMPONENT UNITS【2】APPLICATION AND FEATURES⑤

Extension cord

5-6 Capacitance Measurement (DC・AC 600 V

1. Correct measurement may not be performed when using the meterin the ferromagnetic / intense electric field such as places near atransformer, 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 theinverter circuit.

Stop using it and haveit repaired.

5-7 Hz / % Measurements ( Hz / % )①

DC 600 V
AC 600 V or Peak
Max 840 V

Voltage andCurrent input
prohibited

CAUTION③④

DC・AC 600 V※AC voltage is regulated by rms, valus of sinusoidal wave.

【5】MEASUREMENT PROCEDURE

In the case of action or cancel that function as follows, do not turn thefunction switch in the condition applied input.

Maximum overload
protection input

DC・AC 400 mA 0.5 A / 250 V Fuse

－ 1 －【4】DESCRIPTION OF FUNCTIONSWARNING

Maximum rating
input value

2-2 Features●Sharp contrast LCD with character 17.5 mm high is employed, and unit
symbols are displayed on the screen of the LCD.
●Frequency, capacitance and duty cycle measurement function.
●Attachment body cover is used for protection of the meter and as a tilt
stand.
●The current function is protected by a fuse.

－ 14 －－ 15 －